US3787882A - Servo control of ink jet pump - Google Patents
Servo control of ink jet pump Download PDFInfo
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- US3787882A US3787882A US00293300A US3787882DA US3787882A US 3787882 A US3787882 A US 3787882A US 00293300 A US00293300 A US 00293300A US 3787882D A US3787882D A US 3787882DA US 3787882 A US3787882 A US 3787882A
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- pump
- sensor
- ink jet
- pressure
- ink
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17596—Ink pumps, ink valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
Definitions
- FIG. 4 9o 91 AMP 92 T0 PUMP a2 1 85 L, 76 78 COMPARATOR CONTROL 5 AMP gfbizl -f'f j n ⁇ 94 PATENTEBJANZEIHH SHEET 3 OF 3 FIG. 5
- ink jet printing devices have been proposed heretofore.
- drops of ink are formed and propelled from a nozzle toward a record medium, variably charged according to a signal representative of a wave form or character and deflected by deflection plates having a constant potential applied thereto.
- Velocity of drops can vary considerably due to variations in temperature, pump pressure, and the like. The primary variation is due to temperature which causes large changes in the ink viscosity and hence the ink velocity as it leaves the nozzle.
- the present invention is intended to maintain velocity as constant as possible.
- a number of arrangements are described in the present case for controlling velocity of ink drops in an ink jet printer either directly or indirectly.
- the temperature and/or pressure of the ink is sensed at the pump and appropriate adjustments made to the pump driving circuit to increase or decrease pump pressure and thereby increase or decrease velocity of the stream.
- Another version contemplates the positioning of sensors adjacent the stream of drops for inducement of a voltage as charged drops pass by the sensors and for development of corrective signals to again control pump pressure and velocity of the stream.
- This version can be implemented in a digital or analog fashion, as desired.
- sensors are positioned outside the normal range of drop deflection.
- the primary object of the present invention is to sense various parameters in an ink jet printing system in order to develop corrective signals for controlling pump pressure and/or frequency to ultimately maintain velocity of the ink jet stream within a desired velocity range.
- FIG. 1 is a system representation illustrating servo control of a pump in an ink jet system.
- FIG. 2 illustrates velocity control by sensing of temperature and pressure.
- FIG. 3a illustrates an arrangement for sensing velocity of an ink drop stream to develop digital count levels and conversion to analog for pump control
- FIG. 3b is essentially the same system wherein analog levels are developed directly.
- FIG. 4 illustrates servo control involving the sensing of the maximum deflection of an ink jet stream.
- FIG. 5 is a cross-sectional view of a voice-coil pump that is useful in the various embodiments of FIGS. 1-4.
- FIG. 1 is a generalized version representative of the various systems set forth in greater detail in FIGS. 2-4.
- An ink jet system usually comprising an ink jet printing device, or the like, has an associated sensor 2, such as a temperature sensor.
- the ink jet system may be of the type set forth in the Hill, et al., patent application referred to previously.
- An output developed by sensor 2 is provided to an amplifier circuit 3 and from there to a comparator circuit 4.
- Another input to comparator circuit 4 is a reference signal on line 5.
- the output of comparator 4 is applied to pump control circuit 7 and is used to develop a control signal by lines 10 and 11 to coil 12 of pump 13.
- Servo action may be provided under ordinary circumstances from machine clock 16 through machine logic 17 in conjunction with recognition block 6.
- a pressure sensor 20 associated with pump 13 provides inputs to amplifier circuit 3 instead of sensor 2. If pressure is sensed by sensor 20, as an example, provision is made to develop a corrective signal from pump control circuit 7 in order to increase or decrease pressure of pump 13 from the input signals related to pressure in pump 13. If the velocity of the stream is too slow, indicated by a low pump pressure, it may be increased by increasing the voltage applied to coil 12 of pump 13. Further, the frequency of signal applied to coil 12 may be changed to change pump pressure.
- FIG. 2 This is further illustrated in FIG. 2 where pump 13 is shown with associated coil 12.
- the pump assembly is further associated with nozzle 22 emitting a stream of ink drops 23 directed toward a record medium 25 for printing of characters or waveforms. In the event drops are not required for printing they are directed to a gutter 27.
- Ink is supplied through pump 13 to nozzle 22 from ink supply 29 by conduit 30.
- Pump 13 is a pump which is controlled by coil 12 such that the pressure is a function of coil current.
- Pressure sensor 32 monitors pump pressure and feeds a voltage analogous to pressure to amplifier 35.
- Amplifier 35 compares the pressure signal to the reference signal provided by amplifier 36 and adjusts a voltage controlled oscillator 38 so that current I to pump 13 minimizes the difference between the reference input and the sensor 32 output,
- a manually set adjustment at oscillator 38 allows an initial factory pressure adjustment to be made.
- Amplifier 36 compares temperature reference voltage from block 40 with temperature sensor voltage from sensor 41 and adjusts the pressure reference voltage input for amplifier 35. This causes pressure to follow temperature change to hold velocity constant.
- An ink jet system without initial adjustments, could have as much as a to l variation in deflection sensitivity. This is due, in a large part, to variation in fluid flow through the nozzle. Adjusting pressure to obtain a constant velocity reduces this to a 5 to l variation. Adjusting for zero temperature effect could further reduce this variation to 1.5 or 2 to 1. At that point, including other system tolerances, an adjustment of deflection voltage would hold the machine to an acceptable level of performance.
- a constant current but variable frequency oscillator could be utilized to operate the pump.
- sensors can be used for pressure sensor 32 and temperature sensor 41.
- a thermocouple gauge may serve for temperature sensor 32.
- the circuit of FIG. 2 holds pressure in an ink jet printer constant by means of a servo loop. lt further allows the reference pressure of the servo loop to be temperature compensated so that constant ink jet velocity is maintained with time and temperature variation.
- the servo loop eliminates the dependence upon relatively wide range and difficult to control mechanical tolerances and replaces them with more stable and easily controlled electrical tolerances.
- a pressure sensor or a temperature sensor could be used alone in conjunction with the pump for monitoring and changing pump pressure to thereby control velocity.
- the servo system of FIG. 2 could be set up to maintain a constant pressure for a given temperature and thereafter simply adjust pressure up or down in order to compensate for temperature changes. The converse is also true.
- FIG. 3a illustrates a system for monitoring drop velocity directly and developing signals to control pump pressure in order to change the velocity of the drops, as required.
- FIG. 3a makes use of digital techniques.
- FIG. 3b is related to FIG. 3a using essentially the same sensor arrangement but developing analog signals to change pump pressure rather than digital signals that have to be converted to analog signals.
- a stream of drops 43 is emitted from nozzle 44 passing through a charge electrode 45.
- Gutter 46 is positioned for receiving drops in stream 43.
- Two sensors 48 and 49 are positioned a predetermined distance apart and in proximity to the path of travel of the drops in stream 43.
- the two sensors 48 and 49 feed respectively associated comparator circuits 50 and 51.
- the comparator circuits have reference potentials applied by lines 53 and 54, respectively.
- gate circuit 56 is activated in a synchronous fashion by machine clock pulses on line 58.
- the comparator outputs are fed to gate 56 by lines 60 and 61 through interface connections 62 and 63, respectively.
- a group of drops is emitted from nozzle 44, such as six (6) in number, or the like.
- the group of drops passes sensor 48 developing a voltage which ultimately activates gate 56 to gate counter circuit 65 to start a counting operation.
- another potential is developed that is also applied to gate 56 but that turns off counter 65 instead.
- a number of count pulses is developed in counter 65 that is directly representative of the time required for passage of the drops from sensor 48 to sensor 49.
- the count status of counter 65 is applied to the digital-analog converter circuit 67 in order to derive a correction signal by line 68 that ordinarily would be applied to a pump control circuit similar to circuit 7 in FIG. 1 in order to vary pump pressure as required.
- either the frequency or current drive of the pump can be changed in order to change pump pressure.
- FIG. 3b is an analog approach utilizing various elements in FIG. 3a.
- the circuit of FIG. 3b is substituted for elements 56, 65, and 67 in FIG. 3a by appropriate connection of interface connectors 62a and 63a with connectors 62 and 63, respectively, in FIG. 3a.
- Outputs developed by sensors 48 and 49 in this case are applied to a ramp generator 70.
- the ramp generator Upon detection of a potential on line 60a, FIG. 3b, the ramp generator is activated.
- Ramp generator 70 develops a ramp signal at a known rate and range of voltage levels.
- the output from ramp generator 70 is deactivated.
- the level attained is stored in the holding circuit 71 and applied by line 72 to vary pump pressure in a manner similar to that described before.
- the velocity of the ink stream 43 may be maintained constant.
- the deflection sensitivity of stream 43 is proportion'al to l/( Vel)
- the deflection of stream 43 required during printing of information is also maintained in a tightly controlled manner.
- tolerances on other elements of the system, such as on the nozzle, temperature, etc. need not be maintained as tightly as would otherwise be required.
- Nozzle 75 emits a stream of drops 76 passing through charge electrode 77 and between deflection plates 78 and 79. During printing of information, the drops in stream 76 are directed to a record medium, not shown. When not required for printing, drops are directed to gutter 80.
- maximum deflection of drops is initiated by appropriate charging by charge electrode 77 and deflection by plates 78 and 79 in order that the drops reach the area of two proximity sensors 82 and 83 representing maximum deflection of the stream. As an example, a group of six drops can be used as before.
- Gutter 85 is positioned to receive drops directed between sensors 82 and 583.
- Potentials are developed by sensors 82 and 83 as the stream of drops passes by. It is assumed that a normal deflection for test purposes of the drops in stream 76 is between sensors 82 and 83. If drops pass close to sensor 83 representing an increase in velocity of the drops, an output is developed that is applied to amplifier circuit 90 and in turn to comparator circuit 91 for development of appropriate correction signal by line 92 to control pump pressure. In this case, since the velocity of the drops is somewhat high, the pump pressure is reduced. If drops pass in proximity to sensor 82, an output is developed that is applied to amplifier circuit 94 and again applied to comparator 91. In this case, the stream of drops is moving at a relatively lower velocity and the output signal by line 92 would be of an appropriate level to increase pump pressure.
- FIG. 5 illustrates a highly efficient pump structure 100 that is useful in the various servo circuits previously described.
- Pump 100 includes a pump supporting structure 101 housing a number of elements.
- a flat spring member 102 is mounted for oscillatory movement in structure 101.
- Spring member 102 is driven by coil 104 that in turn is excited by an oscillator 106.
- Attached to member 102 is connecting rod 108 that in turn is connected to a bellows 110.
- Pump 100 further includes an input conduit 112 through which ink is supplied from an ink supply not shown.
- An output conduit 114 supplies ink to a nozzle, not shown, but that would be similar to those previously described. Control of ink passage and pumping is exerted by an input valve 115 and an output valve 116.
- the action of the pump is similar to that of a voice coil normally found in radio and television equipment, or the like.
- the metal diaphragm 102 and associated bellows 110 change the volume of the pump cavity 120.
- Valves 115 and 116 control the flow of ink in and out of the pump.
- the pressure produced by pump 100 is related to the force imparted to bellows 1 by diaphragm 102 which in turn is related to the frequency and current conditions established in coil 104. With these characteristics, pump 100 is readily incorporated in the various servo circuits previously discussed and controllable as required insofar as maintaining a desired pressure range. This in turn, as mentioned, controls drop velocity.
- valve 115 In operation, as bellows 110 moves to the left in FIG. 5, flap 115 opens thereby drawing ink through conduit 112 into chamber 120. Valve 116 remains closed at this time. As bellows 110 moves to the right and expands, valve 115 remains closed and ink is forced through valve 116 and out of way by conduit 114 to the ink jet nozzle.
- a servo system for monitoring and maintaining parameters, affecting quality of printing, such as velocity of the jet, within predetermined ranges, which determines jet placement during printing of information, comprising:
- jet forming means for forming and propelling an ink jet in a predetermined path of travel
- sensor means proximately positioned in relation to said ink jet for sensing a characteristic of said ink jet and for developing a signal representative of said characteristic
- comparator means for comparing said developed signal with a reference signal in order to further de velop a corrective signal
- timing logic interconnected with said pump control means for controlling activation and deactivation of said pump control means.
- said sensor means comprises:
- a temperature sensor for monitoring temperature characteristics of said ink jet.
- said sensor means comprises:
- a pressure sensor for monitoring pressure characteristics of said ink jet.
- a temperature sensor and a pressure sensor incorporated in said sensor means and interconnected with said pump means for monitoring temperature and pressure, respectively;
- circuit means responsive to signals developed by said temperature and pressure sensors and interconnected with said pump means for controlling pump pressure in order to maintain said pump pressure within a predetermined range.
- a first proximity sensor and a second proximity sensor incorporated in said sensor means and connected for input to said comparator means, said proximity sensors being positioned a predetermined distance apart and adjacent the path of travel of said ink jet;
- said comparator means developing a corrective signal responsive to the signals derived from said first and second proximity sensors for application to said pump means in order to maintain pressure in said-pump means within a predetermined range.
- comparator means further comprises:
- said comparator means further comprises:
- digital-analog converter means interconnected between said count means and said pump means for converting digital representations from said count means to an analog signal for application to said pump control means.
- comparator means further comprises:
- a ramp generator circuit providing a ramp signal having predetermined slope and duration characteristics
- sensor means positioned adjacent the path of travel of said ink jet for developing signals from said ink jet during passage thereof past said sensor means indicative of velocity characteristics in said monitoring range
- first and second sensor probes incorporated in said sensor means, said probes being positioned a predetermined distance apart and in proximity to said ink jet when said ink jet passes through said monitoring range;
Abstract
An important factor in quality of printing with an ink jet printing apparatus is the velocity of the ink jet stream. The present case describes a number of servo systems for controlling velocity of the stream. This can be done indirectly by sensing pressure and/or temperature or directly by sensing velocity of the stream and controlling the pump frequency or pump drive currents.
Description
United States Patent Fillmore et al.
[ Jan. 22, 1974 SERVO CONTROL OF INK JET PUMP [54] 3,610,782 10/1971 McGuire 417/326 [75] Inventors: Gary L. Fillmore; Hugh E. Naylor,
ggi g zgg west an of Primary Examiner-Joseph W. Hartary g Attorney, Agent, or Firm-D. Kendall Cooper [73] Assignee: International Business Machines Corporation, Armonk, NY.
22 F1 d: S t. 25, 1972 1 ep 57 ABSTRACT [2]] Appl. No.: 293,300
An important factor in quality of printing with an ink [52] US. Cl 346/75, 346/140, 417/32, jet printing apparatus is the velocity of the ink jet 417/43 stream. The present case describes a number of servo [51] Int. Cl. G01d 15/18 systems for controlling velocity of the stream. This can [58] Field of Search.. 346/75, 140; 417/412, 32, 42, be done indirectly by sensing pressure and/or temper- 417/43, 326; 318/127, 129, 130 ature or directly by sensing velocity of the stream and controlling the pump frequency or pump drive cur- [56] References Cited rents.
UNITED STATES PATENTS 3,296,624 H1967 Ascoli 346/140 13 Claims, 6 Drawing Figures 5 MACHINE {6 Q6 CLOCK RECOGNITION CR h. INTER CHARACTER; MACHINE HOME POSITION LOGIC I 5 I H REFERENCE j COMPARATOR 5 FSENSTRT" SENSOR 1 2 INK JET SYSTEM PAIENIED 3.787. 882
SHEET 1 RT 3 MACHINE 16 FIG. 1 6 CLOCK 4 RECOGNITION CR INTER- CHARACTER; MACHINE 17 MUME POSITION mm m PUMP 5 CONTROL REFERENCE COMPARATOR f5 4/ -AMP 7 T To sEM UR M l SENSOR 2 H 12 gpump INK JET SYSTEM 5 FIG. 2 I 2 TEMPERATURE 2s SENSOR j". H PRESSURE 25 SENSOR PP) INK TEMPERATURE OSCILLATOR SUPPLY REFERENCE E VOLTAGE as PATENTEU M2? 3974 3. 787. 882
MACHINE GATE w I 600 Y CLOCK 61Q X 5 COUNTER RA GEN R DIGILTgb LEVEL ANA c n 67/ CONVERTER PUMP F72 CONTROL PUMP CONTROL FIG. 4 9o 91 AMP 92 T0 PUMP a2 1 85 L, 76 78 COMPARATOR CONTROL 5 AMP gfbizl -f'f j n \94 PATENTEBJANZEIHH SHEET 3 OF 3 FIG. 5
RELATED PATENT APPLICATION U. S. Pat. application Ser. No. 266,790 filed June 27, 1972, entitled Ink Jet Synchronization and Failure Detection System, and having James D. Hill, et al., as inventors.
BACKGROUND OF THE INVENTION AND PRIOR ART Various types of ink jet printing devices have been proposed heretofore. In one such system, drops of ink are formed and propelled from a nozzle toward a record medium, variably charged according to a signal representative of a wave form or character and deflected by deflection plates having a constant potential applied thereto. To insure good placement of drops in forming the waveform character, as the case may be, it is vital that the velocity of the ink drops remain in a predetermined range. Velocity of drops can vary considerably due to variations in temperature, pump pressure, and the like. The primary variation is due to temperature which causes large changes in the ink viscosity and hence the ink velocity as it leaves the nozzle. The present invention is intended to maintain velocity as constant as possible.
SUMMARY OF THE INVENTION A number of arrangements are described in the present case for controlling velocity of ink drops in an ink jet printer either directly or indirectly. In one case, the temperature and/or pressure of the ink is sensed at the pump and appropriate adjustments made to the pump driving circuit to increase or decrease pump pressure and thereby increase or decrease velocity of the stream. Another version contemplates the positioning of sensors adjacent the stream of drops for inducement of a voltage as charged drops pass by the sensors and for development of corrective signals to again control pump pressure and velocity of the stream. This version can be implemented in a digital or analog fashion, as desired. In another arrangement, sensors are positioned outside the normal range of drop deflection. During servo action, maximum deflection of the stream occurs for development of potentials to control the pump with corrective action, as necessary, to increase or decrease pump pressure, and thereby change velocity of the stream. The servo arrangements set forth make use of a highly efficient pump structure based on voice coil driving principles.
OBJECTS The primary object of the present invention, of course, is to sense various parameters in an ink jet printing system in order to develop corrective signals for controlling pump pressure and/or frequency to ultimately maintain velocity of the ink jet stream within a desired velocity range.
The foregoing and other objects, features, and advantages of the invention will be apparent from the following more particular description of the preferred embodiments of the invention as illustrated in the accompanying drawings.
DRAWINGS In the Drawings FIG. 1 is a system representation illustrating servo control of a pump in an ink jet system.
FIG. 2 illustrates velocity control by sensing of temperature and pressure.
FIG. 3a illustrates an arrangement for sensing velocity of an ink drop stream to develop digital count levels and conversion to analog for pump control, while FIG. 3b is essentially the same system wherein analog levels are developed directly.
FIG. 4 illustrates servo control involving the sensing of the maximum deflection of an ink jet stream.
FIG. 5 is a cross-sectional view of a voice-coil pump that is useful in the various embodiments of FIGS. 1-4.
DETAILED DESCRIPTION FIG. 1 is a generalized version representative of the various systems set forth in greater detail in FIGS. 2-4. An ink jet system 1, usually comprising an ink jet printing device, or the like, has an associated sensor 2, such as a temperature sensor. The ink jet system may be of the type set forth in the Hill, et al., patent application referred to previously. An output developed by sensor 2 is provided to an amplifier circuit 3 and from there to a comparator circuit 4. Another input to comparator circuit 4 is a reference signal on line 5. The output of comparator 4 is applied to pump control circuit 7 and is used to develop a control signal by lines 10 and 11 to coil 12 of pump 13. Servo action may be provided under ordinary circumstances from machine clock 16 through machine logic 17 in conjunction with recognition block 6. Thus the operation of the servo system shown in FIG. 1 would usually take place during nonprinting intervals such as during a carrier return (CR) interval, or home position between printing of characters that is, inter-character intervals, and the like, as recognized by block 6. As an alternative and as will be described shortly, a pressure sensor 20 associated with pump 13 provides inputs to amplifier circuit 3 instead of sensor 2. If pressure is sensed by sensor 20, as an example, provision is made to develop a corrective signal from pump control circuit 7 in order to increase or decrease pressure of pump 13 from the input signals related to pressure in pump 13. If the velocity of the stream is too slow, indicated by a low pump pressure, it may be increased by increasing the voltage applied to coil 12 of pump 13. Further, the frequency of signal applied to coil 12 may be changed to change pump pressure.
This is further illustrated in FIG. 2 where pump 13 is shown with associated coil 12. The pump assembly is further associated with nozzle 22 emitting a stream of ink drops 23 directed toward a record medium 25 for printing of characters or waveforms. In the event drops are not required for printing they are directed to a gutter 27. Ink is supplied through pump 13 to nozzle 22 from ink supply 29 by conduit 30. Pump 13 is a pump which is controlled by coil 12 such that the pressure is a function of coil current. Pressure sensor 32 monitors pump pressure and feeds a voltage analogous to pressure to amplifier 35. Amplifier 35 compares the pressure signal to the reference signal provided by amplifier 36 and adjusts a voltage controlled oscillator 38 so that current I to pump 13 minimizes the difference between the reference input and the sensor 32 output,
thus holding pressure constant. A manually set adjustment at oscillator 38 allows an initial factory pressure adjustment to be made. Amplifier 36 compares temperature reference voltage from block 40 with temperature sensor voltage from sensor 41 and adjusts the pressure reference voltage input for amplifier 35. This causes pressure to follow temperature change to hold velocity constant.
An ink jet system, without initial adjustments, could have as much as a to l variation in deflection sensitivity. This is due, in a large part, to variation in fluid flow through the nozzle. Adjusting pressure to obtain a constant velocity reduces this to a 5 to l variation. Adjusting for zero temperature effect could further reduce this variation to 1.5 or 2 to 1. At that point, including other system tolerances, an adjustment of deflection voltage would hold the machine to an acceptable level of performance.
By servo controlling pressure and automatically adjusting for temperature variation, electrical parameters are monitored rather than mechanical parameters. The system can easily compensate for different ink characteristics. Also, less precise tolerances are possible in the nozzle and in ink'batch to batch variation.
Instead of controlling coil current to adjust pressure, a constant current but variable frequency oscillator could be utilized to operate the pump. A wide variety of sensors can be used for pressure sensor 32 and temperature sensor 41. As an example, a thermocouple gauge may serve for temperature sensor 32.
In summary, the circuit of FIG. 2 holds pressure in an ink jet printer constant by means of a servo loop. lt further allows the reference pressure of the servo loop to be temperature compensated so that constant ink jet velocity is maintained with time and temperature variation. The servo loop eliminates the dependence upon relatively wide range and difficult to control mechanical tolerances and replaces them with more stable and easily controlled electrical tolerances.
If desired, either a pressure sensor or a temperature sensor could be used alone in conjunction with the pump for monitoring and changing pump pressure to thereby control velocity. The servo system of FIG. 2 could be set up to maintain a constant pressure for a given temperature and thereafter simply adjust pressure up or down in order to compensate for temperature changes. The converse is also true.
FIG. 3a illustrates a system for monitoring drop velocity directly and developing signals to control pump pressure in order to change the velocity of the drops, as required. FIG. 3a makes use of digital techniques. FIG. 3b is related to FIG. 3a using essentially the same sensor arrangement but developing analog signals to change pump pressure rather than digital signals that have to be converted to analog signals.
In FIG. 3a, a stream of drops 43 is emitted from nozzle 44 passing through a charge electrode 45. Gutter 46 is positioned for receiving drops in stream 43. Two sensors 48 and 49 are positioned a predetermined distance apart and in proximity to the path of travel of the drops in stream 43. The two sensors 48 and 49 feed respectively associated comparator circuits 50 and 51. The comparator circuits have reference potentials applied by lines 53 and 54, respectively. During testing of drop velocity, as when the nozzle 44 is at home position, or in between characters, gate circuit 56 is activated in a synchronous fashion by machine clock pulses on line 58. The comparator outputs are fed to gate 56 by lines 60 and 61 through interface connections 62 and 63, respectively.
In operation, a group of drops is emitted from nozzle 44, such as six (6) in number, or the like. The group of drops passes sensor 48 developing a voltage which ultimately activates gate 56 to gate counter circuit 65 to start a counting operation. When the sequence of drops passes sensor 49, another potential is developed that is also applied to gate 56 but that turns off counter 65 instead. Thus a number of count pulses is developed in counter 65 that is directly representative of the time required for passage of the drops from sensor 48 to sensor 49. The count status of counter 65 is applied to the digital-analog converter circuit 67 in order to derive a correction signal by line 68 that ordinarily would be applied to a pump control circuit similar to circuit 7 in FIG. 1 in order to vary pump pressure as required. As noted before, either the frequency or current drive of the pump can be changed in order to change pump pressure.
FIG. 3b is an analog approach utilizing various elements in FIG. 3a. The circuit of FIG. 3b is substituted for elements 56, 65, and 67 in FIG. 3a by appropriate connection of interface connectors 62a and 63a with connectors 62 and 63, respectively, in FIG. 3a. Outputs developed by sensors 48 and 49 in this case are applied to a ramp generator 70. Upon detection of a potential on line 60a, FIG. 3b, the ramp generator is activated. Ramp generator 70 develops a ramp signal at a known rate and range of voltage levels. Upon detection of another output on lines 61a, FIG. 3b, the output from ramp generator 70 is deactivated. The level attained is stored in the holding circuit 71 and applied by line 72 to vary pump pressure in a manner similar to that described before.
By using the foregoing techniques, the velocity of the ink stream 43 may be maintained constant. As a result, since the deflection sensitivity of stream 43 is proportion'al to l/( Vel), the deflection of stream 43 required during printing of information is also maintained in a tightly controlled manner. Using the servo techniques previously described, tolerances on other elements of the system, such as on the nozzle, temperature, etc. need not be maintained as tightly as would otherwise be required.
In FIG. 4, the actual deflection of a stream of drops is tested in order to determine velocity characteristics. Nozzle 75 emits a stream of drops 76 passing through charge electrode 77 and between deflection plates 78 and 79. During printing of information, the drops in stream 76 are directed to a record medium, not shown. When not required for printing, drops are directed to gutter 80. During testing of velocity of the stream, maximum deflection of drops is initiated by appropriate charging by charge electrode 77 and deflection by plates 78 and 79 in order that the drops reach the area of two proximity sensors 82 and 83 representing maximum deflection of the stream. As an example, a group of six drops can be used as before. Gutter 85 is positioned to receive drops directed between sensors 82 and 583. Potentials are developed by sensors 82 and 83 as the stream of drops passes by. It is assumed that a normal deflection for test purposes of the drops in stream 76 is between sensors 82 and 83. If drops pass close to sensor 83 representing an increase in velocity of the drops, an output is developed that is applied to amplifier circuit 90 and in turn to comparator circuit 91 for development of appropriate correction signal by line 92 to control pump pressure. In this case, since the velocity of the drops is somewhat high, the pump pressure is reduced. If drops pass in proximity to sensor 82, an output is developed that is applied to amplifier circuit 94 and again applied to comparator 91. In this case, the stream of drops is moving at a relatively lower velocity and the output signal by line 92 would be of an appropriate level to increase pump pressure.
FIG. 5 illustrates a highly efficient pump structure 100 that is useful in the various servo circuits previously described. Pump 100 includes a pump supporting structure 101 housing a number of elements. A flat spring member 102 is mounted for oscillatory movement in structure 101. Spring member 102 is driven by coil 104 that in turn is excited by an oscillator 106. Attached to member 102 is connecting rod 108 that in turn is connected to a bellows 110. Pump 100 further includes an input conduit 112 through which ink is supplied from an ink supply not shown. An output conduit 114 supplies ink to a nozzle, not shown, but that would be similar to those previously described. Control of ink passage and pumping is exerted by an input valve 115 and an output valve 116. The action of the pump is similar to that of a voice coil normally found in radio and television equipment, or the like. The metal diaphragm 102 and associated bellows 110 change the volume of the pump cavity 120. Valves 115 and 116 control the flow of ink in and out of the pump.
The pressure produced by pump 100 is related to the force imparted to bellows 1 by diaphragm 102 which in turn is related to the frequency and current conditions established in coil 104. With these characteristics, pump 100 is readily incorporated in the various servo circuits previously discussed and controllable as required insofar as maintaining a desired pressure range. This in turn, as mentioned, controls drop velocity.
In operation, as bellows 110 moves to the left in FIG. 5, flap 115 opens thereby drawing ink through conduit 112 into chamber 120. Valve 116 remains closed at this time. As bellows 110 moves to the right and expands, valve 115 remains closed and ink is forced through valve 116 and out of way by conduit 114 to the ink jet nozzle.
While the invention has been particularly shown and described with reference to several embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made without departure from the spirit and scope of the invention.
What is claimed is:
1. In an ink printing apparatus, a servo system for monitoring and maintaining parameters, affecting quality of printing, such as velocity of the jet, within predetermined ranges, which determines jet placement during printing of information, comprising:
jet forming means for forming and propelling an ink jet in a predetermined path of travel,
pump means interconnected with said jet forming means for maintaining a predetermined level of ink jet pressure in said jet forming means;
sensor means proximately positioned in relation to said ink jet for sensing a characteristic of said ink jet and for developing a signal representative of said characteristic;
comparator means for comparing said developed signal with a reference signal in order to further de velop a corrective signal; and
means for applying said corrective signal to said pump means in order to maintain pressure exerted by said pump means in said jet forming means within a predetermined range, thereby maintaining jet velocity, jet placement, and printing of information within a predetermined range of printing.
2. The apparatus of claim 1, further comprising:
pump control means interconnected with said pump means for directing corrective signals from said comparator means to said pump means; and
timing logic interconnected with said pump control means for controlling activation and deactivation of said pump control means.
3. The apparatus of claim 2 wherein said ink jet is directed to a medium for recording of information in the form of character intervals, each separated by an intercharacter interval; and further comprising:
recognition means interconnected with said logic means for recognizing said inter-character intervals and for activating said pump control means during said intercharacter intervals. I
4. The apparatus of claim 3 wherein said ink jet forming means and said medium are relatively moved from a home position to record information, and further comprising:
means in said recognition means for activating said pump control means while said apparatus is at home position.
5. The apparatus of claim 1, wherein said sensor means comprises:
a temperature sensor for monitoring temperature characteristics of said ink jet.
6. The apparatus of claim 1, wherein said sensor means comprises:
a pressure sensor for monitoring pressure characteristics of said ink jet.
7. The apparatus of claim 1, further comprising:
a temperature sensor and a pressure sensor incorporated in said sensor means and interconnected with said pump means for monitoring temperature and pressure, respectively; and
circuit means responsive to signals developed by said temperature and pressure sensors and interconnected with said pump means for controlling pump pressure in order to maintain said pump pressure within a predetermined range.
8. The apparatusof claim 1, further comprising:
a first proximity sensor and a second proximity sensor incorporated in said sensor means and connected for input to said comparator means, said proximity sensors being positioned a predetermined distance apart and adjacent the path of travel of said ink jet;
means for developing signals from said proximity sensors indicative of the passage of ink as it moves past said proximity sensors; and
said comparator means developing a corrective signal responsive to the signals derived from said first and second proximity sensors for application to said pump means in order to maintain pressure in said-pump means within a predetermined range.
9. The apparatus of claim 8, wherein said comparator means further comprises:
activatable gate means;
means interconnecting said proximity sensors as inputs to said gate means;
count means;
means interconnecting said gate means and said count means to initiate operation of said count means under control of said gate means during an activate mode of said gate means in order to develop digital count representations; and
means for activating said gate means and thereby said count means upon sensing passage of ink moving past said first proximity sensor and for deactivating saidgate means and said count means upon sensing passage of ink past said second proximity sensor.
10. The apparatus of claim 9, wherein said comparator means further comprises:
digital-analog converter means interconnected between said count means and said pump means for converting digital representations from said count means to an analog signal for application to said pump control means.
11. The apparatus of claim 8, wherein said comparator means further comprises:
a ramp generator circuit providing a ramp signal having predetermined slope and duration characteristics;
means interconnecting said proximity sensors as inputs to said ramp generator;
an analog holding circuit;
means for initiating operation of said ramp generator circuit upon sensing passage of ink by said first proximity sensor and for terminating operation of said ramp circuit upon sensing passage of ink by said second proximity sensor;
means interconnecting said ramp generator to said analog holding circuit in order to provide the ramp level attained by said ramp circuit to said analog holding circuit; and
means interconnecting said holding circuit to said pump means in order to correct pressure in said pump means.
12. The apparatus of claim 1 wherein said ink jet passes through a charge electrode and between deflection electrodes for charging and deflection within a predetermined deflection monitoring range, and further comprising:
means for applying a charging potential to said charging electrodes in order to deflect said ink jet into said monitoring range;
sensor means positioned adjacent the path of travel of said ink jet for developing signals from said ink jet during passage thereof past said sensor means indicative of velocity characteristics in said monitoring range, and
means for applying said velocity characteristics signals to said pump control means in order to correct pressure in said pump means.
13. The apparatus of claim 12, further comprising:
first and second sensor probes incorporated in said sensor means, said probes being positioned a predetermined distance apart and in proximity to said ink jet when said ink jet passes through said monitoring range; and
means interconnected with said probes and said pump means and responsive to signals developed by said probes for developing corrective signals for application to said pump means in order to increase or decrease pump pressure, as required, in order to maintain jet velocity within a predetermined range.
Claims (13)
1. In an ink printing apparatus, a servo system for monitoring and maintaining parameters, affecting quality of printing, such as velocity of the jet, within predetermined ranges, which determines jet placement during printing of information, comprising: jet forming means for forming and propelling an ink jet in a predetermined path of travel, pump means interconnected with said jet forming means for maintaining a predetermined level of ink jet pressure in said jet forming means; sensor means proximately positioned in relation to said ink jet for sensing a characteristic of said ink jet and for developing a signal representative of said characteristic; comparator means for comparing said developed signal with a reference signal in order to further develop a corrective signal; and means for applying said corrective signal to said pump means in order to maintain pressure exerted by said pump means in said jet forming means within a predetermined range, thereby maintaining jet velocity, jet placement, and printing of information within a predetermined range of printing.
2. The apparatus of claim 1, further comprising: pump control means interconnected with said pump means for directing corrective signals from said comparator means to said pump means; and timing logic interconnected with said pump control means for controlling activation and deactivation of said pump control means.
3. The apparatus of claim 2 wherein said ink jet is directed to a medium for recording of information in the form of character intervals, each separated by an inter-character interval; and further comprising: recognition means interconnected with said logic means for recognizing said inter-character intervals and for activating said pump control means during said intercharacter intervals.
4. The apparatus of claim 3 wherein said ink jet forming means and said medium are relatively moved from a home position to record information, and further comprising: means in said recognition means for activating said pump control means while said apparatus is at home position.
5. The apparatus of claim 1, wherein said sensor means comprises: a temperature sensor for monitoring temperature characteristics of said ink jet.
6. The apparatus of claim 1, wherein said sensor means comprises: a pressure sensor for monitoring pressure characteristics of said ink jet.
7. The apparatus of claim 1, further comprising: a temperature sensor and a pressure sensor incorporated in said sensor means and interconnected with said pump means for monitoring temperature and pressure, respectively; and circuit means responsive to signals developed by said temperature and pressure sensors and interconnected with said pump means for controlling pump pressure in order to maintain said pump pressure within a predetermined range.
8. The apparatus of claim 1, further comprising: a first proximity sensor aNd a second proximity sensor incorporated in said sensor means and connected for input to said comparator means, said proximity sensors being positioned a predetermined distance apart and adjacent the path of travel of said ink jet; means for developing signals from said proximity sensors indicative of the passage of ink as it moves past said proximity sensors; and said comparator means developing a corrective signal responsive to the signals derived from said first and second proximity sensors for application to said pump means in order to maintain pressure in said pump means within a predetermined range.
9. The apparatus of claim 8, wherein said comparator means further comprises: activatable gate means; means interconnecting said proximity sensors as inputs to said gate means; count means; means interconnecting said gate means and said count means to initiate operation of said count means under control of said gate means during an activate mode of said gate means in order to develop digital count representations; and means for activating said gate means and thereby said count means upon sensing passage of ink moving past said first proximity sensor and for deactivating said gate means and said count means upon sensing passage of ink past said second proximity sensor.
10. The apparatus of claim 9, wherein said comparator means further comprises: digital-analog converter means interconnected between said count means and said pump means for converting digital representations from said count means to an analog signal for application to said pump control means.
11. The apparatus of claim 8, wherein said comparator means further comprises: a ramp generator circuit providing a ramp signal having predetermined slope and duration characteristics; means interconnecting said proximity sensors as inputs to said ramp generator; an analog holding circuit; means for initiating operation of said ramp generator circuit upon sensing passage of ink by said first proximity sensor and for terminating operation of said ramp circuit upon sensing passage of ink by said second proximity sensor; means interconnecting said ramp generator to said analog holding circuit in order to provide the ramp level attained by said ramp circuit to said analog holding circuit; and means interconnecting said holding circuit to said pump means in order to correct pressure in said pump means.
12. The apparatus of claim 1 wherein said ink jet passes through a charge electrode and between deflection electrodes for charging and deflection within a predetermined deflection monitoring range, and further comprising: means for applying a charging potential to said charging electrodes in order to deflect said ink jet into said monitoring range; sensor means positioned adjacent the path of travel of said ink jet for developing signals from said ink jet during passage thereof past said sensor means indicative of velocity characteristics in said monitoring range, and means for applying said velocity characteristics signals to said pump control means in order to correct pressure in said pump means.
13. The apparatus of claim 12, further comprising: first and second sensor probes incorporated in said sensor means, said probes being positioned a predetermined distance apart and in proximity to said ink jet when said ink jet passes through said monitoring range; and means interconnected with said probes and said pump means and responsive to signals developed by said probes for developing corrective signals for application to said pump means in order to increase or decrease pump pressure, as required, in order to maintain jet velocity within a predetermined range.
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Cited By (99)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3886564A (en) * | 1973-08-17 | 1975-05-27 | Ibm | Deflection sensors for ink jet printers |
US3907429A (en) * | 1974-08-08 | 1975-09-23 | Ibm | Method and device for detecting the velocity of droplets formed from a liquid stream |
US3911818A (en) * | 1973-09-04 | 1975-10-14 | Moore Business Forms Inc | Computer controlled ink jet printing |
US3914772A (en) * | 1972-10-27 | 1975-10-21 | Casio Computer Co Ltd | Ink jet type printing device |
JPS5121441A (en) * | 1974-08-15 | 1976-02-20 | Nippon Telegraph & Telephone | INKUJETSUTOPURINTAANIOKERU INJISEIGYOSOCHI |
US3950762A (en) * | 1974-06-18 | 1976-04-13 | Koh-I-Noor Rapidograph, Inc. | Drawing method and drawing instrument |
US3953860A (en) * | 1973-03-12 | 1976-04-27 | Nippon Telegraph And Telephone Public Corporation | Charge amplitude detection for ink jet system printer |
US3971039A (en) * | 1973-11-24 | 1976-07-20 | Nippon Telegraph And Telephone Public Corporation | Ink jet system printer with temperature compensation |
US4007684A (en) * | 1973-09-26 | 1977-02-15 | Nippon Telegraph And Telephone Public Corporation | Ink liquid warmer for ink jet system printer |
US4032259A (en) * | 1976-01-08 | 1977-06-28 | E. I. Du Pont De Nemours And Company | Method and apparatus for measuring fluid flow in small bore conduits |
US4034380A (en) * | 1975-04-08 | 1977-07-05 | Ricoh Co., Ltd. | Ink ejection apparatus for printer |
US4045770A (en) * | 1976-11-11 | 1977-08-30 | International Business Machines Corporation | Method and apparatus for adjusting the velocity of ink drops in an ink jet printer |
US4063252A (en) * | 1976-11-11 | 1977-12-13 | International Business Machines Corporation | Method and apparatus for controlling the velocity of ink drops in an ink jet printer |
US4084165A (en) * | 1975-12-22 | 1978-04-11 | Siemens Aktiengesellschaft | Fluid-jet writing system |
US4085408A (en) * | 1973-09-07 | 1978-04-18 | Minolta Camera Kabushiki Kaisha | Liquid jet recording apparatus |
US4137011A (en) * | 1977-06-14 | 1979-01-30 | Spectra-Physics, Inc. | Flow control system for liquid chromatographs |
US4146901A (en) * | 1977-11-25 | 1979-03-27 | International Business Machines Corporation | Apparatus for recording information on a recording surface |
FR2410248A1 (en) * | 1977-10-31 | 1979-06-22 | Ibm | DETECTOR OF DEVIATION OF AN OBJECT IN RELATION TO ITS TRAJECTORY |
US4183030A (en) * | 1976-04-01 | 1980-01-08 | Minolta Camera Kabushiki Kaisha | Ink jet recording apparatus |
US4217594A (en) * | 1977-10-17 | 1980-08-12 | International Business Machines Corporation | Method and apparatus for determining the velocity of a liquid stream of droplets |
US4241406A (en) * | 1978-12-21 | 1980-12-23 | International Business Machines Corporation | System and method for analyzing operation of an ink jet head |
US4249188A (en) * | 1979-02-27 | 1981-02-03 | Graf Ronald E | Uncharged ink drop rastering, monitoring, and control |
US4257395A (en) * | 1979-03-26 | 1981-03-24 | Solomon Wieder | Fluid flow controller |
US4292640A (en) * | 1980-03-28 | 1981-09-29 | International Business Machines Corporation | Closed loop compensation of ink jet aerodynamics |
US4310846A (en) * | 1978-12-28 | 1982-01-12 | Ricoh Company, Ltd. | Deflection compensated ink ejection printing apparatus |
DE3115121A1 (en) * | 1980-04-14 | 1982-02-25 | Ricoh Co., Ltd., Tokyo | Ink jet printer |
US4342042A (en) * | 1980-12-19 | 1982-07-27 | Pitney Bowes Inc. | Ink supply system for an array of ink jet heads |
US4346388A (en) * | 1980-06-13 | 1982-08-24 | The Mead Corporation | Ink jet fluid supply system |
EP0065103A2 (en) * | 1981-05-15 | 1982-11-24 | International Business Machines Corporation | Methods of operating an electro-magnetic transducer and apparatus therefor |
DE3218263A1 (en) * | 1981-05-15 | 1982-12-02 | Ricoh Co., Ltd., Tokyo | Ink temperature control device for an ink jet printer |
US4388630A (en) * | 1980-03-22 | 1983-06-14 | Sharp Kabushiki Kaisha | Ink liquid supply system which compensates for temperature variation |
US4400705A (en) * | 1979-12-18 | 1983-08-23 | Ricoh Company, Ltd. | Ink jet printing apparatus |
US4417256A (en) * | 1980-05-09 | 1983-11-22 | International Business Machines Corporation | Break-off uniformity maintenance |
DE3328598A1 (en) * | 1982-09-20 | 1984-03-22 | Xerox Corp., 14644 Rochester, N.Y. | CHECK VALVE FOR AN INK-JET EJECTOR OPERATABLE DROP-NEEDED |
USRE31586E (en) * | 1977-01-21 | 1984-05-15 | Altex Scientific, Inc. | Liquid chromatography pump |
USRE31608E (en) * | 1977-01-21 | 1984-06-19 | Altex Scientific, Inc. | Fluid pump mechanism |
US4496960A (en) * | 1982-09-20 | 1985-01-29 | Xerox Corporation | Ink jet ejector utilizing check valves to prevent air ingestion |
US4514742A (en) * | 1980-06-16 | 1985-04-30 | Nippon Electric Co., Ltd. | Printer head for an ink-on-demand type ink-jet printer |
US4575735A (en) * | 1983-02-04 | 1986-03-11 | Willett International Limited | Droplet depositing viscosity line-pressure sensing control for fluid re-supply |
US4577203A (en) * | 1981-09-30 | 1986-03-18 | Epson Corporation | Ink jet recording apparatus |
US4658272A (en) * | 1981-10-02 | 1987-04-14 | Canon Kabushiki Kaisha | Ink-supplying device |
US4688047A (en) * | 1986-08-21 | 1987-08-18 | Eastman Kodak Company | Method and apparatus for sensing satellite ink drop charge and adjusting ink pressure |
US4700205A (en) * | 1986-01-17 | 1987-10-13 | Metromedia Company | Hydraulic servomechanism for controlling the pressure of writing fluid in an ink jet printing system |
US4734711A (en) * | 1986-12-22 | 1988-03-29 | Eastman Kodak Company | Pressure regulation system for multi-head ink jet printing apparatus |
US4848657A (en) * | 1985-09-27 | 1989-07-18 | Toyota Jidosha Kabushiki Kaisha | Method of and apparatus for controlling the flow rate of viscous fluid |
US5061156A (en) * | 1990-05-18 | 1991-10-29 | Tritec Industries, Inc. | Bellows-type dispensing pump |
US5096120A (en) * | 1988-06-24 | 1992-03-17 | Behr Industrieanlagen Gmbh & Co. | Process and apparatus to guide a spray material to a plurality of spraying statins |
US5108264A (en) * | 1990-08-20 | 1992-04-28 | Hewlett-Packard Company | Method and apparatus for real time compensation of fluid compressibility in high pressure reciprocating pumps |
EP0608919A1 (en) * | 1988-08-15 | 1994-08-03 | Viking Pump, Inc. | Terminal element |
US5396274A (en) * | 1992-05-20 | 1995-03-07 | Videojet Systems International, Inc. | Variable frequency ink jet printer |
US5517216A (en) * | 1992-07-28 | 1996-05-14 | Videojet Systems International, Inc. | Ink jet printer employing time of flight control system for ink jet printers |
US5673073A (en) * | 1994-09-29 | 1997-09-30 | Hewlett-Packard Company | Syringe for filling print cartridge and establishing correct back pressure |
US5675367A (en) * | 1992-12-23 | 1997-10-07 | Hewlett-Packard Company | Inkjet print cartridge having handle which incorporates an ink fill port |
US5732751A (en) * | 1995-12-04 | 1998-03-31 | Hewlett-Packard Company | Filling ink supply containers |
US5748216A (en) * | 1991-06-19 | 1998-05-05 | Hewlett-Packard Company | Inkjet print cartridge having valve connectable to an external ink reservoir for recharging the print cartridge |
US5751320A (en) * | 1994-09-29 | 1998-05-12 | Hewlett-Packard Company | Ink recharger for inkjet print cartridge having sliding valve connectable to print cartridge |
US5771053A (en) * | 1995-12-04 | 1998-06-23 | Hewlett-Packard Company | Assembly for controlling ink release from a container |
US5777648A (en) * | 1991-06-19 | 1998-07-07 | Hewlett-Packard Company | Inkjet print cartridge having an ink fill port for initial filling and a recharge port with recloseable seal for recharging the print cartridge with ink |
US5815182A (en) * | 1995-12-04 | 1998-09-29 | Hewlett-Packard Company | Fluid interconnect for ink-jet pen |
US5847734A (en) * | 1995-12-04 | 1998-12-08 | Pawlowski, Jr.; Norman E. | Air purge system for an ink-jet printer |
US5852458A (en) * | 1991-08-27 | 1998-12-22 | Hewlett-Packard Company | Inkjet print cartridge having a first inlet port for initial filling and a second inlet port for ink replenishment without removing the print cartridge from the printer |
US5900895A (en) * | 1995-12-04 | 1999-05-04 | Hewlett-Packard Company | Method for refilling an ink supply for an ink-jet printer |
US5963238A (en) * | 1991-06-19 | 1999-10-05 | Hewlett-Packard Company | Intermittent refilling of print cartridge installed in an inkjet printer |
US6000791A (en) * | 1992-12-23 | 1999-12-14 | Hewlett-Packard Company | Printer having a removable print cartridge with handle incorporating an ink inlet value |
EP1095778A3 (en) * | 1999-10-29 | 2002-08-14 | SCITEX DIGITAL PRINTING, Inc. | Improved fluid and vacuum control in an ink jet printing system |
US20040070641A1 (en) * | 2002-07-29 | 2004-04-15 | Fuji Photo Film Co., Ltd. | Liquid ejecting device |
US20040136833A1 (en) * | 2003-01-10 | 2004-07-15 | Allington Robert W. | High pressure reciprocating pump and control of the same |
US20040202575A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Signal to noise ratio in chromatography |
US20040204864A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Signal to noise ratio in chromatography |
US20040205422A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Signal to noise ratio in chromatography |
US20040204866A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Method and apparatus to enhance the signal to noise ratio in chromatography |
US20050123408A1 (en) * | 2003-12-08 | 2005-06-09 | Koehl Robert M. | Pump control system and method |
US20060045750A1 (en) * | 2004-08-26 | 2006-03-02 | Pentair Pool Products, Inc. | Variable speed pumping system and method |
US20060204367A1 (en) * | 2001-11-26 | 2006-09-14 | Meza Humberto V | Pump and pump control circuit apparatus and method |
US20070114162A1 (en) * | 2004-08-26 | 2007-05-24 | Pentair Water Pool And Spa, Inc. | Control algorithm of variable speed pumping system |
US20070154319A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Pumping system with power optimization |
US20070154323A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Speed control |
US20070154320A1 (en) * | 2004-08-26 | 2007-07-05 | Pentair Water Pool And Spa, Inc. | Flow control |
US20070154321A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Priming protection |
US20070163929A1 (en) * | 2004-08-26 | 2007-07-19 | Pentair Water Pool And Spa, Inc. | Filter loading |
US20070183902A1 (en) * | 2004-08-26 | 2007-08-09 | Pentair Water Pool And Spa, Inc. | Anti-entrapment and anti-dead head function |
US20080174627A1 (en) * | 2006-10-26 | 2008-07-24 | Seiko Epson Corporation | Method for controlling droplet discharge head, drawing method, and droplet discharge device |
US20100149233A1 (en) * | 2008-12-12 | 2010-06-17 | Katerberg James A | Pressure modulation cleaning of jetting module nozzles |
US20100310382A1 (en) * | 2009-06-09 | 2010-12-09 | Melissa Drechsel Kidd | Method of Controlling a Pump and Motor |
US20100308963A1 (en) * | 2009-06-09 | 2010-12-09 | Melissa Drechsel Kidd | System and Method for Motor Drive Control Pad and Drive Terminals |
US8564233B2 (en) | 2009-06-09 | 2013-10-22 | Sta-Rite Industries, Llc | Safety system and method for pump and motor |
US8602743B2 (en) | 2008-10-06 | 2013-12-10 | Pentair Water Pool And Spa, Inc. | Method of operating a safety vacuum release system |
US20140285549A1 (en) * | 2013-03-25 | 2014-09-25 | Dainippon Screen Mfg. Co., Ltd. | Apparatus for and method of supplying liquid |
US9084845B2 (en) | 2011-11-02 | 2015-07-21 | Smith & Nephew Plc | Reduced pressure therapy apparatuses and methods of using same |
US9227000B2 (en) | 2006-09-28 | 2016-01-05 | Smith & Nephew, Inc. | Portable wound therapy system |
US9427505B2 (en) | 2012-05-15 | 2016-08-30 | Smith & Nephew Plc | Negative pressure wound therapy apparatus |
US9446178B2 (en) | 2003-10-28 | 2016-09-20 | Smith & Nephew Plc | Wound cleansing apparatus in-situ |
US9568005B2 (en) | 2010-12-08 | 2017-02-14 | Pentair Water Pool And Spa, Inc. | Discharge vacuum relief valve for safety vacuum release system |
US9844473B2 (en) | 2002-10-28 | 2017-12-19 | Smith & Nephew Plc | Apparatus for aspirating, irrigating and cleansing wounds |
US9885360B2 (en) | 2012-10-25 | 2018-02-06 | Pentair Flow Technologies, Llc | Battery backup sump pump systems and methods |
FR3060449A1 (en) * | 2016-12-20 | 2018-06-22 | Dover Europe Sarl | METHOD AND DEVICE FOR DETECTING THE SPEED OF JETS |
US10465676B2 (en) | 2011-11-01 | 2019-11-05 | Pentair Water Pool And Spa, Inc. | Flow locking system and method |
US10682446B2 (en) | 2014-12-22 | 2020-06-16 | Smith & Nephew Plc | Dressing status detection for negative pressure wound therapy |
US11027051B2 (en) | 2010-09-20 | 2021-06-08 | Smith & Nephew Plc | Pressure control apparatus |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS538622B2 (en) * | 1973-09-04 | 1978-03-30 | ||
CA1012198A (en) | 1974-07-19 | 1977-06-14 | Stephan B. Sears | Method and apparatus for recording with writing fluids and drop projection means therefor |
US3929071A (en) * | 1974-12-23 | 1975-12-30 | Ibm | Ink recirculating system for ink jet printing apparatus |
JPS5573564A (en) * | 1978-11-29 | 1980-06-03 | Ricoh Co Ltd | Ink feed system of ink jet printer |
DE2903339B2 (en) * | 1979-01-29 | 1980-11-13 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Circuit arrangement for temperature-dependent voltage regulation for piezoelectric writing nozzles in ink mosaic writing devices |
DE2905062A1 (en) * | 1979-02-10 | 1980-08-14 | Olympia Werke Ag | Ink jet printer drop speed measurement - by measuring time between pressure generator impulse and drop detection signal |
JPS5927532Y2 (en) * | 1979-02-14 | 1984-08-09 | 三菱電機株式会社 | Holding device for plate parts |
US4260996A (en) * | 1979-04-23 | 1981-04-07 | International Business Machines Corporation | Aspirated ink jet printer head |
JPS55158974A (en) * | 1979-05-26 | 1980-12-10 | Ricoh Co Ltd | Choking detector in ink jet printer and remover thereof |
JPS5838992Y2 (en) * | 1979-07-13 | 1983-09-02 | 株式会社 ニフコ | Attachment/removal/holding device for tubular fuses |
JPS5655268A (en) * | 1979-10-11 | 1981-05-15 | Sharp Corp | Controller for particle of ink in ink jet printer |
US4311436A (en) * | 1979-11-13 | 1982-01-19 | International Business Machines Corporation | Fluid pressure and velocity sensing apparatus |
JPS56146780A (en) * | 1980-04-17 | 1981-11-14 | Ricoh Co Ltd | Ink droplet deflection controlling system for charge deflection type ink jet recorder |
US4435720A (en) * | 1981-05-21 | 1984-03-06 | Ricoh Company, Ltd. | Deflection control type ink jet printing apparatus |
DE3231105A1 (en) * | 1981-08-20 | 1983-03-03 | Ricoh Co., Ltd., Tokyo | Ink jet printer |
JPS5840170A (en) * | 1981-08-31 | 1983-03-09 | Matsushita Electric Works Ltd | Flow coater |
EP0076050B1 (en) * | 1981-09-08 | 1987-06-03 | Gds Instruments Limited | Pressure source |
CH650590A5 (en) * | 1982-04-16 | 1985-07-31 | Gerard Andre Lavanchy | Method and device for measuring the flow or grain size quality material powder. |
JPS58181546U (en) * | 1982-05-07 | 1983-12-03 | 日本光電工業株式会社 | Inkjet recording device |
DE3318498A1 (en) * | 1982-05-20 | 1983-11-24 | Ricoh Co., Ltd., Tokyo | Ink jet printer |
US4555711A (en) * | 1982-08-30 | 1985-11-26 | Ricoh Company, Ltd. | Deflection control ink jet operation adjustment control |
DE3331587A1 (en) * | 1982-09-01 | 1984-03-01 | Ricoh Co., Ltd., Tokyo | Ink jet printer with deflection control |
US4598299A (en) * | 1982-11-11 | 1986-07-01 | Ricoh Company, Ltd. | Deflection control ink jet printing apparatus |
GB2154321A (en) * | 1983-12-21 | 1985-09-04 | Post Office Headquarters The | Time of flight measurement for ink jet printers |
JPS60187696U (en) * | 1984-05-22 | 1985-12-12 | シャープ株式会社 | portable cleaning device |
DE3507670A1 (en) * | 1985-03-05 | 1986-09-11 | Gesellschaft für Automationstechnik mbH, 7768 Stockach | METHOD FOR CONTROLLING AND IMPROVING THE WRITTEN QUALITY OF A PRINTER |
JPS61206659A (en) * | 1985-03-11 | 1986-09-12 | Ricoh Co Ltd | Ink jet printer |
US4651161A (en) * | 1986-01-17 | 1987-03-17 | Metromedia, Inc. | Dynamically varying the pressure of fluid to an ink jet printer head |
FR3049214B1 (en) | 2016-03-22 | 2018-04-27 | Dover Europe Sarl | DEBIT AND USE IN A PRINTER |
FR3049343A1 (en) | 2016-03-22 | 2017-09-29 | Dover Europe Sarl | DEVICE FOR MEASURING FLOW AND VISCOSITY AND ITS USE IN A PRINTER |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3296624A (en) * | 1963-12-17 | 1967-01-03 | Paillard Sa | Arrangement for feeding ink into the output nozzle of a writing instrument |
US3610782A (en) * | 1969-10-06 | 1971-10-05 | Precision Control Products Cor | Controlled pump |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3600955A (en) * | 1969-10-16 | 1971-08-24 | Dick Co Ab | Ink drop velocity indicator |
JPS4871538A (en) * | 1971-12-27 | 1973-09-27 | ||
JPS5040736A (en) * | 1973-08-09 | 1975-04-14 |
-
1972
- 1972-09-25 US US00293300A patent/US3787882A/en not_active Expired - Lifetime
-
1973
- 1973-06-20 IT IT25613/73A patent/IT989311B/en active
- 1973-07-30 FR FR7328900*A patent/FR2197343A5/fr not_active Expired
- 1973-08-06 JP JP48087693A patent/JPS5838317B2/en not_active Expired
- 1973-08-16 GB GB3879373A patent/GB1408657A/en not_active Expired
- 1973-09-15 DE DE2346558A patent/DE2346558C2/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3296624A (en) * | 1963-12-17 | 1967-01-03 | Paillard Sa | Arrangement for feeding ink into the output nozzle of a writing instrument |
US3610782A (en) * | 1969-10-06 | 1971-10-05 | Precision Control Products Cor | Controlled pump |
Cited By (217)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3914772A (en) * | 1972-10-27 | 1975-10-21 | Casio Computer Co Ltd | Ink jet type printing device |
US3953860A (en) * | 1973-03-12 | 1976-04-27 | Nippon Telegraph And Telephone Public Corporation | Charge amplitude detection for ink jet system printer |
US3886564A (en) * | 1973-08-17 | 1975-05-27 | Ibm | Deflection sensors for ink jet printers |
US3911818A (en) * | 1973-09-04 | 1975-10-14 | Moore Business Forms Inc | Computer controlled ink jet printing |
US4085408A (en) * | 1973-09-07 | 1978-04-18 | Minolta Camera Kabushiki Kaisha | Liquid jet recording apparatus |
US4007684A (en) * | 1973-09-26 | 1977-02-15 | Nippon Telegraph And Telephone Public Corporation | Ink liquid warmer for ink jet system printer |
US3971039A (en) * | 1973-11-24 | 1976-07-20 | Nippon Telegraph And Telephone Public Corporation | Ink jet system printer with temperature compensation |
US3950762A (en) * | 1974-06-18 | 1976-04-13 | Koh-I-Noor Rapidograph, Inc. | Drawing method and drawing instrument |
US3907429A (en) * | 1974-08-08 | 1975-09-23 | Ibm | Method and device for detecting the velocity of droplets formed from a liquid stream |
JPS5121441A (en) * | 1974-08-15 | 1976-02-20 | Nippon Telegraph & Telephone | INKUJETSUTOPURINTAANIOKERU INJISEIGYOSOCHI |
US4034380A (en) * | 1975-04-08 | 1977-07-05 | Ricoh Co., Ltd. | Ink ejection apparatus for printer |
US4084165A (en) * | 1975-12-22 | 1978-04-11 | Siemens Aktiengesellschaft | Fluid-jet writing system |
US4032259A (en) * | 1976-01-08 | 1977-06-28 | E. I. Du Pont De Nemours And Company | Method and apparatus for measuring fluid flow in small bore conduits |
US4183030A (en) * | 1976-04-01 | 1980-01-08 | Minolta Camera Kabushiki Kaisha | Ink jet recording apparatus |
US4063252A (en) * | 1976-11-11 | 1977-12-13 | International Business Machines Corporation | Method and apparatus for controlling the velocity of ink drops in an ink jet printer |
US4045770A (en) * | 1976-11-11 | 1977-08-30 | International Business Machines Corporation | Method and apparatus for adjusting the velocity of ink drops in an ink jet printer |
USRE31586E (en) * | 1977-01-21 | 1984-05-15 | Altex Scientific, Inc. | Liquid chromatography pump |
USRE31608E (en) * | 1977-01-21 | 1984-06-19 | Altex Scientific, Inc. | Fluid pump mechanism |
US4137011A (en) * | 1977-06-14 | 1979-01-30 | Spectra-Physics, Inc. | Flow control system for liquid chromatographs |
US4217594A (en) * | 1977-10-17 | 1980-08-12 | International Business Machines Corporation | Method and apparatus for determining the velocity of a liquid stream of droplets |
FR2410248A1 (en) * | 1977-10-31 | 1979-06-22 | Ibm | DETECTOR OF DEVIATION OF AN OBJECT IN RELATION TO ITS TRAJECTORY |
US4146901A (en) * | 1977-11-25 | 1979-03-27 | International Business Machines Corporation | Apparatus for recording information on a recording surface |
US4241406A (en) * | 1978-12-21 | 1980-12-23 | International Business Machines Corporation | System and method for analyzing operation of an ink jet head |
US4310846A (en) * | 1978-12-28 | 1982-01-12 | Ricoh Company, Ltd. | Deflection compensated ink ejection printing apparatus |
US4249188A (en) * | 1979-02-27 | 1981-02-03 | Graf Ronald E | Uncharged ink drop rastering, monitoring, and control |
US4257395A (en) * | 1979-03-26 | 1981-03-24 | Solomon Wieder | Fluid flow controller |
US4400705A (en) * | 1979-12-18 | 1983-08-23 | Ricoh Company, Ltd. | Ink jet printing apparatus |
US4388630A (en) * | 1980-03-22 | 1983-06-14 | Sharp Kabushiki Kaisha | Ink liquid supply system which compensates for temperature variation |
US4292640A (en) * | 1980-03-28 | 1981-09-29 | International Business Machines Corporation | Closed loop compensation of ink jet aerodynamics |
DE3115121A1 (en) * | 1980-04-14 | 1982-02-25 | Ricoh Co., Ltd., Tokyo | Ink jet printer |
US4370664A (en) * | 1980-04-14 | 1983-01-25 | Ricoh Company, Ltd. | Ink jet printing apparatus |
US4417256A (en) * | 1980-05-09 | 1983-11-22 | International Business Machines Corporation | Break-off uniformity maintenance |
US4346388A (en) * | 1980-06-13 | 1982-08-24 | The Mead Corporation | Ink jet fluid supply system |
US4514742A (en) * | 1980-06-16 | 1985-04-30 | Nippon Electric Co., Ltd. | Printer head for an ink-on-demand type ink-jet printer |
US4342042A (en) * | 1980-12-19 | 1982-07-27 | Pitney Bowes Inc. | Ink supply system for an array of ink jet heads |
US4374386A (en) * | 1981-05-15 | 1983-02-15 | International Business Machines Corporation | Force-temperature stabilization of an electromagnetic device |
EP0065103A3 (en) * | 1981-05-15 | 1984-02-22 | International Business Machines Corporation | Methods of operating an electro-magnetic transducer and apparatus therefor |
DE3218263A1 (en) * | 1981-05-15 | 1982-12-02 | Ricoh Co., Ltd., Tokyo | Ink temperature control device for an ink jet printer |
EP0065103A2 (en) * | 1981-05-15 | 1982-11-24 | International Business Machines Corporation | Methods of operating an electro-magnetic transducer and apparatus therefor |
US4577203A (en) * | 1981-09-30 | 1986-03-18 | Epson Corporation | Ink jet recording apparatus |
US4658272A (en) * | 1981-10-02 | 1987-04-14 | Canon Kabushiki Kaisha | Ink-supplying device |
DE3328598A1 (en) * | 1982-09-20 | 1984-03-22 | Xerox Corp., 14644 Rochester, N.Y. | CHECK VALVE FOR AN INK-JET EJECTOR OPERATABLE DROP-NEEDED |
US4487662A (en) * | 1982-09-20 | 1984-12-11 | Xerox Corporation | Electrodeposition method for check valve |
US4496960A (en) * | 1982-09-20 | 1985-01-29 | Xerox Corporation | Ink jet ejector utilizing check valves to prevent air ingestion |
US4575735A (en) * | 1983-02-04 | 1986-03-11 | Willett International Limited | Droplet depositing viscosity line-pressure sensing control for fluid re-supply |
US4848657A (en) * | 1985-09-27 | 1989-07-18 | Toyota Jidosha Kabushiki Kaisha | Method of and apparatus for controlling the flow rate of viscous fluid |
US4700205A (en) * | 1986-01-17 | 1987-10-13 | Metromedia Company | Hydraulic servomechanism for controlling the pressure of writing fluid in an ink jet printing system |
US4688047A (en) * | 1986-08-21 | 1987-08-18 | Eastman Kodak Company | Method and apparatus for sensing satellite ink drop charge and adjusting ink pressure |
WO1988001232A1 (en) * | 1986-08-21 | 1988-02-25 | Eastman Kodak Company | Ink jet control in continuous ink jet printing |
US4734711A (en) * | 1986-12-22 | 1988-03-29 | Eastman Kodak Company | Pressure regulation system for multi-head ink jet printing apparatus |
US5096120A (en) * | 1988-06-24 | 1992-03-17 | Behr Industrieanlagen Gmbh & Co. | Process and apparatus to guide a spray material to a plurality of spraying statins |
EP0608919A1 (en) * | 1988-08-15 | 1994-08-03 | Viking Pump, Inc. | Terminal element |
US5061156A (en) * | 1990-05-18 | 1991-10-29 | Tritec Industries, Inc. | Bellows-type dispensing pump |
US5108264A (en) * | 1990-08-20 | 1992-04-28 | Hewlett-Packard Company | Method and apparatus for real time compensation of fluid compressibility in high pressure reciprocating pumps |
US5966156A (en) * | 1991-06-19 | 1999-10-12 | Hewlett-Packard Company | Refilling technique for inkjet print cartridge having two ink inlet ports for initial filling and recharging |
US5777648A (en) * | 1991-06-19 | 1998-07-07 | Hewlett-Packard Company | Inkjet print cartridge having an ink fill port for initial filling and a recharge port with recloseable seal for recharging the print cartridge with ink |
US5963238A (en) * | 1991-06-19 | 1999-10-05 | Hewlett-Packard Company | Intermittent refilling of print cartridge installed in an inkjet printer |
US5748216A (en) * | 1991-06-19 | 1998-05-05 | Hewlett-Packard Company | Inkjet print cartridge having valve connectable to an external ink reservoir for recharging the print cartridge |
US5852458A (en) * | 1991-08-27 | 1998-12-22 | Hewlett-Packard Company | Inkjet print cartridge having a first inlet port for initial filling and a second inlet port for ink replenishment without removing the print cartridge from the printer |
US5396274A (en) * | 1992-05-20 | 1995-03-07 | Videojet Systems International, Inc. | Variable frequency ink jet printer |
US5517216A (en) * | 1992-07-28 | 1996-05-14 | Videojet Systems International, Inc. | Ink jet printer employing time of flight control system for ink jet printers |
US6000791A (en) * | 1992-12-23 | 1999-12-14 | Hewlett-Packard Company | Printer having a removable print cartridge with handle incorporating an ink inlet value |
US5675367A (en) * | 1992-12-23 | 1997-10-07 | Hewlett-Packard Company | Inkjet print cartridge having handle which incorporates an ink fill port |
US5751320A (en) * | 1994-09-29 | 1998-05-12 | Hewlett-Packard Company | Ink recharger for inkjet print cartridge having sliding valve connectable to print cartridge |
US5992987A (en) * | 1994-09-29 | 1999-11-30 | Hewlett-Packard Company | Technique for filling a print cartridge with ink and maintaining a correct back pressure |
US5673073A (en) * | 1994-09-29 | 1997-09-30 | Hewlett-Packard Company | Syringe for filling print cartridge and establishing correct back pressure |
US5771053A (en) * | 1995-12-04 | 1998-06-23 | Hewlett-Packard Company | Assembly for controlling ink release from a container |
US5815182A (en) * | 1995-12-04 | 1998-09-29 | Hewlett-Packard Company | Fluid interconnect for ink-jet pen |
US5847734A (en) * | 1995-12-04 | 1998-12-08 | Pawlowski, Jr.; Norman E. | Air purge system for an ink-jet printer |
US5900895A (en) * | 1995-12-04 | 1999-05-04 | Hewlett-Packard Company | Method for refilling an ink supply for an ink-jet printer |
US5732751A (en) * | 1995-12-04 | 1998-03-31 | Hewlett-Packard Company | Filling ink supply containers |
EP1095778A3 (en) * | 1999-10-29 | 2002-08-14 | SCITEX DIGITAL PRINTING, Inc. | Improved fluid and vacuum control in an ink jet printing system |
US20080152508A1 (en) * | 2001-11-26 | 2008-06-26 | Meza Humberto V | Pump and pump control circuit apparatus and method |
US20060204367A1 (en) * | 2001-11-26 | 2006-09-14 | Meza Humberto V | Pump and pump control circuit apparatus and method |
US20080181790A1 (en) * | 2001-11-26 | 2008-07-31 | Meza Humberto V | Pump and pump control circuit apparatus and method |
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US7004557B2 (en) * | 2002-07-29 | 2006-02-28 | Fuji Photo Film Co., Ltd. | Liquid ejecting device |
US20040070641A1 (en) * | 2002-07-29 | 2004-04-15 | Fuji Photo Film Co., Ltd. | Liquid ejecting device |
US10842678B2 (en) | 2002-10-28 | 2020-11-24 | Smith & Nephew Plc | Apparatus for aspirating, irrigating and cleansing wounds |
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US7037081B2 (en) | 2003-01-10 | 2006-05-02 | Teledyne Isco, Inc. | High pressure reciprocating pump and control of the same |
US20040136833A1 (en) * | 2003-01-10 | 2004-07-15 | Allington Robert W. | High pressure reciprocating pump and control of the same |
US6997683B2 (en) | 2003-01-10 | 2006-02-14 | Teledyne Isco, Inc. | High pressure reciprocating pump and control of the same |
US20040151594A1 (en) * | 2003-01-10 | 2004-08-05 | Allington Robert W. | High pressure reciprocating pump and control of the same |
US20040204866A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Method and apparatus to enhance the signal to noise ratio in chromatography |
US20040205422A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Signal to noise ratio in chromatography |
US20040204864A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Signal to noise ratio in chromatography |
US20040202575A1 (en) * | 2003-04-09 | 2004-10-14 | Allington Robert W. | Signal to noise ratio in chromatography |
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US20080131286A1 (en) * | 2003-12-08 | 2008-06-05 | Koehl Robert M | Pump controller system and method |
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US20080140353A1 (en) * | 2003-12-08 | 2008-06-12 | Koehl Robert M | Pump controller system and method |
US20080131294A1 (en) * | 2003-12-08 | 2008-06-05 | Koehl Robert M | Pump controller system and method |
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US20080181789A1 (en) * | 2003-12-08 | 2008-07-31 | Koehl Robert M | Pump controller system and method |
US20080181787A1 (en) * | 2003-12-08 | 2008-07-31 | Koehl Robert M | Pump controller system and method |
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US20080181785A1 (en) * | 2003-12-08 | 2008-07-31 | Koehl Robert M | Pump controller system and method |
US10409299B2 (en) | 2003-12-08 | 2019-09-10 | Pentair Water Pool And Spa, Inc. | Pump controller system and method |
US10642287B2 (en) | 2003-12-08 | 2020-05-05 | Pentair Water Pool And Spa, Inc. | Pump controller system and method |
US20080260540A1 (en) * | 2003-12-08 | 2008-10-23 | Koehl Robert M | Pump controller system and method |
US20090104044A1 (en) * | 2003-12-08 | 2009-04-23 | Koehl Robert M | Pump controller system and method |
US7572108B2 (en) | 2003-12-08 | 2009-08-11 | Sta-Rite Industries, Llc | Pump controller system and method |
US7612510B2 (en) | 2003-12-08 | 2009-11-03 | Sta-Rite Industries, Llc | Pump controller system and method |
US10416690B2 (en) | 2003-12-08 | 2019-09-17 | Pentair Water Pool And Spa, Inc. | Pump controller system and method |
US20050123408A1 (en) * | 2003-12-08 | 2005-06-09 | Koehl Robert M. | Pump control system and method |
US20080131295A1 (en) * | 2003-12-08 | 2008-06-05 | Koehl Robert M | Pump controller system and method |
US20080131289A1 (en) * | 2003-12-08 | 2008-06-05 | Koehl Robert M | Pump controller system and method |
US7751159B2 (en) | 2003-12-08 | 2010-07-06 | Sta-Rite Industries, Llc | Pump controller system and method |
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US20080131296A1 (en) * | 2003-12-08 | 2008-06-05 | Koehl Robert M | Pump controller system and method |
US9399992B2 (en) | 2003-12-08 | 2016-07-26 | Pentair Water Pool And Spa, Inc. | Pump controller system and method |
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US20080131291A1 (en) * | 2003-12-08 | 2008-06-05 | Koehl Robert M | Pump controller system and method |
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US20070154323A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Speed control |
US11391281B2 (en) | 2004-08-26 | 2022-07-19 | Pentair Water Pool And Spa, Inc. | Priming protection |
US8043070B2 (en) | 2004-08-26 | 2011-10-25 | Pentair Water Pool And Spa, Inc. | Speed control |
US20070154322A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Pumping system with two way communication |
US20070154321A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Priming protection |
US10731655B2 (en) | 2004-08-26 | 2020-08-04 | Pentair Water Pool And Spa, Inc. | Priming protection |
US10871001B2 (en) | 2004-08-26 | 2020-12-22 | Pentair Water Pool And Spa, Inc. | Filter loading |
US8465262B2 (en) | 2004-08-26 | 2013-06-18 | Pentair Water Pool And Spa, Inc. | Speed control |
US8469675B2 (en) | 2004-08-26 | 2013-06-25 | Pentair Water Pool And Spa, Inc. | Priming protection |
US8480373B2 (en) | 2004-08-26 | 2013-07-09 | Pentair Water Pool And Spa, Inc. | Filter loading |
US8500413B2 (en) | 2004-08-26 | 2013-08-06 | Pentair Water Pool And Spa, Inc. | Pumping system with power optimization |
US20110091329A1 (en) * | 2004-08-26 | 2011-04-21 | Stiles Jr Robert W | Pumping System with Two Way Communication |
US10871163B2 (en) | 2004-08-26 | 2020-12-22 | Pentair Water Pool And Spa, Inc. | Pumping system and method having an independent controller |
US8573952B2 (en) | 2004-08-26 | 2013-11-05 | Pentair Water Pool And Spa, Inc. | Priming protection |
US20070183902A1 (en) * | 2004-08-26 | 2007-08-09 | Pentair Water Pool And Spa, Inc. | Anti-entrapment and anti-dead head function |
US8602745B2 (en) | 2004-08-26 | 2013-12-10 | Pentair Water Pool And Spa, Inc. | Anti-entrapment and anti-dead head function |
US20070154320A1 (en) * | 2004-08-26 | 2007-07-05 | Pentair Water Pool And Spa, Inc. | Flow control |
US20110076156A1 (en) * | 2004-08-26 | 2011-03-31 | Stiles Jr Robert W | Flow Control |
US8801389B2 (en) | 2004-08-26 | 2014-08-12 | Pentair Water Pool And Spa, Inc. | Flow control |
US8840376B2 (en) | 2004-08-26 | 2014-09-23 | Pentair Water Pool And Spa, Inc. | Pumping system with power optimization |
US10527042B2 (en) | 2004-08-26 | 2020-01-07 | Pentair Water Pool And Spa, Inc. | Speed control |
US10502203B2 (en) | 2004-08-26 | 2019-12-10 | Pentair Water Pool And Spa, Inc. | Speed control |
US9051930B2 (en) | 2004-08-26 | 2015-06-09 | Pentair Water Pool And Spa, Inc. | Speed control |
US8019479B2 (en) | 2004-08-26 | 2011-09-13 | Pentair Water Pool And Spa, Inc. | Control algorithm of variable speed pumping system |
US20110052416A1 (en) * | 2004-08-26 | 2011-03-03 | Robert Stiles | Variable Speed Pumping System and Method |
US10480516B2 (en) | 2004-08-26 | 2019-11-19 | Pentair Water Pool And Spa, Inc. | Anti-entrapment and anti-deadhead function |
US20070163929A1 (en) * | 2004-08-26 | 2007-07-19 | Pentair Water Pool And Spa, Inc. | Filter loading |
US7874808B2 (en) | 2004-08-26 | 2011-01-25 | Pentair Water Pool And Spa, Inc. | Variable speed pumping system and method |
US7854597B2 (en) | 2004-08-26 | 2010-12-21 | Pentair Water Pool And Spa, Inc. | Pumping system with two way communication |
US9404500B2 (en) | 2004-08-26 | 2016-08-02 | Pentair Water Pool And Spa, Inc. | Control algorithm of variable speed pumping system |
US7686589B2 (en) | 2004-08-26 | 2010-03-30 | Pentair Water Pool And Spa, Inc. | Pumping system with power optimization |
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US20070154319A1 (en) * | 2004-08-26 | 2007-07-05 | Stiles Robert W Jr | Pumping system with power optimization |
US7845913B2 (en) | 2004-08-26 | 2010-12-07 | Pentair Water Pool And Spa, Inc. | Flow control |
US9551344B2 (en) | 2004-08-26 | 2017-01-24 | Pentair Water Pool And Spa, Inc. | Anti-entrapment and anti-dead head function |
US20060045750A1 (en) * | 2004-08-26 | 2006-03-02 | Pentair Pool Products, Inc. | Variable speed pumping system and method |
US10240604B2 (en) | 2004-08-26 | 2019-03-26 | Pentair Water Pool And Spa, Inc. | Pumping system with housing and user interface |
US9605680B2 (en) | 2004-08-26 | 2017-03-28 | Pentair Water Pool And Spa, Inc. | Control algorithm of variable speed pumping system |
US10240606B2 (en) | 2004-08-26 | 2019-03-26 | Pentair Water Pool And Spa, Inc. | Pumping system with two way communication |
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US9777733B2 (en) | 2004-08-26 | 2017-10-03 | Pentair Water Pool And Spa, Inc. | Flow control |
US20070114162A1 (en) * | 2004-08-26 | 2007-05-24 | Pentair Water Pool And Spa, Inc. | Control algorithm of variable speed pumping system |
US9932984B2 (en) | 2004-08-26 | 2018-04-03 | Pentair Water Pool And Spa, Inc. | Pumping system with power optimization |
US10130526B2 (en) | 2006-09-28 | 2018-11-20 | Smith & Nephew, Inc. | Portable wound therapy system |
US9642955B2 (en) | 2006-09-28 | 2017-05-09 | Smith & Nephew, Inc. | Portable wound therapy system |
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US9227000B2 (en) | 2006-09-28 | 2016-01-05 | Smith & Nephew, Inc. | Portable wound therapy system |
US20080174627A1 (en) * | 2006-10-26 | 2008-07-24 | Seiko Epson Corporation | Method for controlling droplet discharge head, drawing method, and droplet discharge device |
US9726184B2 (en) | 2008-10-06 | 2017-08-08 | Pentair Water Pool And Spa, Inc. | Safety vacuum release system |
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US9885360B2 (en) | 2012-10-25 | 2018-02-06 | Pentair Flow Technologies, Llc | Battery backup sump pump systems and methods |
US8974019B2 (en) * | 2013-03-25 | 2015-03-10 | Dainippon Screen Mfg. Co., Ltd. | Apparatus for and method of supplying liquid |
US20140285549A1 (en) * | 2013-03-25 | 2014-09-25 | Dainippon Screen Mfg. Co., Ltd. | Apparatus for and method of supplying liquid |
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US11654228B2 (en) | 2014-12-22 | 2023-05-23 | Smith & Nephew Plc | Status indication for negative pressure wound therapy |
FR3060449A1 (en) * | 2016-12-20 | 2018-06-22 | Dover Europe Sarl | METHOD AND DEVICE FOR DETECTING THE SPEED OF JETS |
EP3339031A1 (en) * | 2016-12-20 | 2018-06-27 | Dover Europe Sàrl | Method and device for detecting the velocity of jets |
Also Published As
Publication number | Publication date |
---|---|
JPS50105733A (en) | 1975-08-20 |
GB1408657A (en) | 1975-10-01 |
IT989311B (en) | 1975-05-20 |
DE2346558A1 (en) | 1974-04-11 |
FR2197343A5 (en) | 1974-03-22 |
JPS5838317B2 (en) | 1983-08-22 |
DE2346558C2 (en) | 1984-08-30 |
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Owner name: MORGAN BANK Free format text: SECURITY INTEREST;ASSIGNOR:IBM INFORMATION PRODUCTS CORPORATION;REEL/FRAME:005678/0062 Effective date: 19910327 Owner name: IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL BUSINESS MACHINES CORPORATION;REEL/FRAME:005678/0098 Effective date: 19910326 |