US3858703A - Bidirectional dual head printer - Google Patents
Bidirectional dual head printer Download PDFInfo
- Publication number
- US3858703A US3858703A US414645A US41464573A US3858703A US 3858703 A US3858703 A US 3858703A US 414645 A US414645 A US 414645A US 41464573 A US41464573 A US 41464573A US 3858703 A US3858703 A US 3858703A
- Authority
- US
- United States
- Prior art keywords
- character
- register
- dot column
- characters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/10—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers
-
- 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
- B41J19/00—Character- or line-spacing mechanisms
- B41J19/14—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction
- B41J19/142—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction with a reciprocating print head printing in both directions across the paper width
-
- 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
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/235—Print head assemblies
-
- 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
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/235—Print head assemblies
- B41J2/25—Print wires
- B41J2/255—Arrangement of the print ends of the wires
-
- 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
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/305—Ink supply apparatus
-
- 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
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
Definitions
- the print mode is such that printing of as the print heads move from g of the interspersed lines oc- [52] US. 197/1 R every other line occurs [51] B4lj l/34 left to right and printin move from right to left after revious line of characters or other symbols.
- Novel electronics are AQUVP 6 a em d mm em ho C 8 2. mm TV ua Ch 06 5 72 ,7 5H 7 0 W4 43 3., R3 19 71 90 h C r a e S f 0 d l e .1 F m 5 provided to ache multiple head References Cited UNITED STATES PATENTS complish the above printing modes.
- T printer may also be employed in a further possible to employ more example, three ormore, in eithe graphics mode. It is th an two heads, for r the printing or printer has the further graphic modes, if desired. The capability of half-step printing.
- PATENTED JAN 71975 sum m or 14 BIDIRECTIONAL DUAL HEAD PRINTER
- the present invention relates to line printers and more particularly to a novel multiple head line printer device wherein the heads are arranged in spaced fashion and are simultaneously performing print operations as well as being capable of printing in both the forward and reverse feed directions.
- Wire matrix printers are becoming increasingly more important and more useful in the field of high-speed document printing. Printers of this type are extremely advantageous for use in conjunction with computers, data terminals, communication systems and the like, wherein it is desired to provide a print-out of the data either received or converted and compiled by a computer.
- the wire matrix printer described therein is comprised of a carriage assembly which supports a print head assembly carrying a plurality of solenoid driven print wires.
- the print head assembly, including the solenoid drivers, is moved transversely across a paper document, usually at a constant rate of speed.
- the arrangement of the print head assembly is such as to provide a lightweight compact structure and to minimize the mass which is moved across the paper document, enabling the structure to move at relatively high speed.
- the location of the print head assembly at any given instant is detected by a position read-out or registration assembly which permits print-out at any given location regardless of the speed at which the print head assembly is being moved and, even deviations of the speed of movement will not affect or reduce the registration quality.
- the print head assembly is arranged preferably so as to align the print wires which impact the paper document along an imaginary straight line which is typically arranged in vertical fashion.
- the print head assembly moves from left to right in the printing phase with the solenoids being selectively operated so as to print any combination of dots" upon the paper document,
- dots are typically formed by causing the free ends of the print wires to be impacted against an inked ribbon so as to form dot patterns upon the paper document.
- Combinations of the dot patterns i.e., vertical rows of the dot patterns
- the printer described in the above-mentioned United States patent is capable of printing up to 132 characters per line of print.
- the print head Upon the completion of printing of a line, the print head is moved from the right toward the left, preferably at a carriage return speed which is greater than the speed at which the print head assembly is moved during the print' operation. This time interval thus constitutes a dead time interval since no printing occurs during a carriage return" operation.
- the wire matrix printer of the above-mentioned U.S. Pat. No. 3,703,949 is capable of printing a line of 132 characters at a rate of the order of 60 lines per minute (for full 132 character lines). Whereas thisoperating speed may be useful for certain applications, it is still nevertheless desirable to provide a capability of printing at ever increasing speeds.
- the present invention is characterized by providing a novel multiple print head wire matrix printer which retains all of the advantageous features of the single print head printer embodied in the aforementioned US. Pat. No. 3,703,949 but, due to its significantly increased capability, is capable of printing at speeds of lines per minute for full 132 character lines, which is an output speed more than double that ofthe printing capabilities of the wire matrix printer disclosed in the abovementioned US. Pat. No. 3,703,949.
- the printer of the present invention is comprised of a printer housing having means movably'mounting at least first and second p'fint head assemblies which are moved in a direction transverse to the direction of feed of the paper document and which are moved simultaneously so as to affect the simultaneous operation of the plurality of print head assemblies.
- first and second print head assemblies i.e., in the dual head printer
- each print head operates to print one-half of a line of characters.
- the dual print heads are initially moved to their left-hand most positions and move from left to right as the printing operation of the first line of charac ters is initiated.
- the printer of the present invention in order to assure absolute registration of each vertical column of dots printed by each of the print head assemblies, employs a registration means which is comprised of a registration strip having a plurality of substantially equispaced narrow substantially transparent slits.
- the registration strip is mounted in a stationary fashion and has a length which is physically about one-half the length of the line of characters about one-half the length of the line of characters to be printed.
- the number of slits provided in the registration strip is of a magnitude approximately equal to at least one-half the total number -od characters which may be printed on a line multiplied by the number of vertical dot patterns employed to represent any given character.
- each print head assembly is provided with seven slender print wires whose impact ends are arranged along a vertically aligned imaginary straight line.
- Nine closely spaced vertically aligned dot patterns cooperatively form each character or symbol with the dots of the 9x7 matrix being selectively formed to represent any given character or symbol. Since the vertically aligned dot columns are very closely spaced to one another, it is not possible, as a practical matter, to provide vertically aligned transparent slits in the registration strip with such close spacing.
- the registration strip is provided with only five closely spaced vertically aligned transparent slits for each character with the slits being sufficiertt in number to control the printing of five of the nine columns employed to form each character.
- the electronics of the printer is designed to provide for half-step printing whereby the electronic logic initiates formation of vertical dot columns at half-step locations between the five registration slits.
- the system logic it is possible through the system logic to create half-step dot patterns at four positions interspersed between the five registration slits to create a 7-row by 9-column matrix of dots with those particular dots selected being adapted to represent any desired character of symbol.
- the printer electronics includes shift register means having a capacity sufficient to store up to 132 characters or other symbols plus a dummy character. After the shift register is loaded with the dummy character and the number of characters to be printed for a particular line (either 132 characters or some lesser quantity) means are provided for shifting the characters in the shift register, which is of the recirculating type, a sufficient number of places so as to move the binary code representing the first character to be printed by the right-hand print head assembly (i.e., the print head assembly which is designed to print the right-hand portion of a line of characters) into the right-hand most stage of the shift register.
- the right-hand print head assembly i.e., the print head assembly which is designed to print the right-hand portion of a line of characters
- the coded representation for the character to be printed by the right-hand print head assembly is transferred from temporary storage to the character generator for generating the left-hand most or first dot column for that character without erasing the character from the temporary storage.
- the information developed by the character generator representing the first dot column to be printed by the right-hand print head assembly is temporarily stored in a second buffer means. Thereafter, the coded representation of the character to be printed by the left-hand print head assembly and which is located in the right-hand most stage of the shift register is then applied to the full-step character generator causing it to develop the first dot column pattern for the character to be printed by the left-hand print head assembly.
- the output of the character generator at this time, simultaneously with the output of the character generator just previously stored is simultaneously caused to enable both left and right-hand print head assemblies to print the first or left-hand most dot column for the first character to be printed by each of these print head assemblies. This completes the first full step dot column.
- the timing of the system logic causes the binary coded representations of the first character to be printed by the left and right-hand print head assemblies to be sequentially applied to the half-step character generator which causes the dot column pattern for the first half-step dot column of the right-hand character to be printed to be generated. by the half-step character generator and temporarily stored in the second buffer means.
- the binary coded representation of the character to be printed by the left-hand print head assembly and which is stored in the right-hand most stage of the shift register to be applied to the halfstep character generator.
- the first half-step vertical dot patterns are then simultaneously applied to the print head assemblies to develop the first half-step dot column pattern.
- This technique is repeated for the four remaining full-step dot patterns and the three remaining half-step dot patterns thereby completing the simultaneous printing of the first character of both the right and left print head assemblies.
- the shift register is then shifted the appropriate number of steps to shift the binary coded representations of the second characters or symbols to be printed by the left and right-hand print assemblies to again cause the printing of the second character by each print head assembly.
- This operation is repeated until both of the left and right-hand print head assemblies complete the printing of an entire line. After completion of the first entire line, the right-hand-most print head assembly will have moved to the extreme right-hand end of the paper document while the lefthand print head assembly will have moved to a location substantially equal to half the width of a full line of characters on the paper document.
- the shift register will be operated so as to permit the dual head assemblies to print the next line of characters while the print head assemblies move from the left to the right, thereby totally eliminating the need for a conventional carriage return operation which, for example, is the type of operation employed in the aforementioned US. patent.
- the shifting operation imposed upon the shift register is substantially the same in nature as the shifting operations imposed upon the shift register in cases where the plurality of print head assemblies move from left to right.
- the logic of the system is adapted to automatically transfer dot column patterns in the reverse order during printing operations in which the plurality of print head assemblies move from the right to the left.
- the binary coded representations of the characters or symbols to be printed are transferred to the full and half-step character generators in the same manner as was previously described.
- the distinction in printing with the print head assemblies moving from right to left is such that the right-hand most dot column patterns of the characters to be printed by the print head assemblies are the first dot column patterns to be transferred to the print head assemblies, therefore the dot column patterns for the characters to be printed by the print head assemblies are transferred to the print head assemblies in the reverse order from that employed during printing operations in which the print head assemblies move from the left to the right.
- the electronic logic of the system is such as to immediately recognize the direction of movement of the print head assemblies in order to automatically and properly transfer the appropriate dot column pattern to the print head assemblies.
- each full-step dot column pattern is printed when the registration system detects the presence of a transparent registration slit.
- the electronics of the system functions to control the printing of each half-step dot column pattern which necessarily will be positioned between a pair of adjacent transparent registration slits representative of full-step dot column positions.
- the registration system further includes a light source and a light sensitive detector mounted upon the carriage assembly which moves the plurality of print head assemblies. A signal is generated by the movement of the optical pickup head and light source moving across the vertically aligned registration strip which consists ofa series of alternately transparent and opaque slots.
- the signal developed is amplified and shaped to generate a strobe pulse that initiates the timing for the printing of each character.
- the strobe pulses are counted (there are six pulses per character) and a decoder provides a plurality of individual states which are employed for the dotcolumn positions of the dot matrix.
- the strobe also undergoes a delay to develop a signal called delay strobe which enables the time sharing between two character generators. This allows the dot column patterns in the halfstep positions to be inserted between the five fullstep positions to provide better definition in character formation.
- the carriage assembly is slidably mounted upon guide means and is provided with means for supporting and accurately positioning the plurality of print head assemblies upon the carriage assembly.
- Various adjustment mechanisms are provided for each print head assembly to assure its correct alignment, as well as its alignment relative to the other print head assemblies.
- the driving force for the carriage assembly consists of a closed loop belt drive wherein the timing belt is entrained about a drive pulley and a driven pulley with the free ends of the timing belt being fixedly secured to opposite ends of the carriage assembly to thereby form a closed loop for the timing belt.
- Single motor means are employed for driving the carriage assembly in both the forward and reverse print directions with clutch means being provided to move the carriage assembly alternatively in the forward and reverse directions as each succeeding line of characters is completed.
- An electromagnetic brake means is employed for abruptly terminating the movement of the carriage assembly as it arrives at each of its extreme left and right-hand most positions.
- the single motor means is further employed as the driving means for imparting all other forms of mechanical or physical motion such as, for example, paper feed (i.e., line feed), form feed and ribbon feed.
- Another object of the present invention is to provide a novel impact printer of the dot-matrix type in which printing is performed by the print head assemblies regardless of the direction in which the print head assembly is moving as as to totally eliminate the need for conventional carriage-return" operations.
- Still another object of the present invention is to provide a novel high-speed impact printer of the dotmatrix type in which half-step" dot patterns may be generated to significantly improve the resolution of characters or other symbols to be printed.
- Still another object of the present invention is to provide a novel high-speed impact printer of the dotmatrix type employing a simplified and yet highly reliable mechanical driving means for the rapid and accurate movement of the print head assemblies, as well as for performing all other mechanical functions such as paper feed and ribbon feed operations.
- FIG. 1 is a perspective view of a printer incorporating the principles of the present invention.
- FIG. 2a Zq show schematic diagrams of logical control circuitry employed to operate the printer of FIG. 1.
- FIGS. 3a 3d is a logic circuit diagram which shows the circuits for storing data to be printed by the printer of of FIG. 1.
- FIG. 3b shows a logic diagram of the latch circuits for temporarily storing the character to be ultimately transferred to the right hand print head.
- FIG. 30 is a logic diagram showing the character generators used to generate full and half step dot column patterns.
- FIG. 3d shows the latch circuitry for temporarily storing the dot column pattern used to operate this righthand print head.
- FIGS. 404d, 4h and 4k-4m logical circuit diagrams of the circuitry employed to control the operation of the shift register, character, generators and latch circuits of FIGS. 3a3d.
- FIGS. Sa-Sd are logic diagrams of the logical circuitry employed to control print head movement.
- FIGS. 6a and 6b are logic diagrams showing the logical circuitry employed to control paper document movement.
- FIG. 7 shows a flow diagram of the operation of the printer of FIG. I and its logical circuitry.
- FIG. 1 shows a simplified version 1MB of the printer which comprises first (A) and second (B) print head assemblies 101 and 102 mounted upon carriages 103 and 104 respectively, which, in turn, are mechanically joined by coupler 105 so as to move in unison.
- Each print head assembly is provided with seven solenoids each utilized to selectively print seven vertically aligned dots.
- Copending application M-7l27 shows a typical print head construction.
- the carriages are secured to a closed loop timing belt 106 as shown at 07.
- Belt 106 is driven by a motor M whose output is selectively coupled to belt 106 by either forward clutch 108 or a reverse clutch 109.
- An inked ribbon 110 is positioned in front of both print heads 101 and 102 and spans paper document 111.
- the selective energization of solenoids S of the two print heads causes the ribbon to inpact the paper document 111 and form the dot column patterns.
- the print heads each form characters or other symbols, each printing nine dot columns which collectively form a character.
- the carriages 103-104 ride along guide tracks 112 (only one is shown in FIG. 1) in moving in the forward and reverse directions.
- a photo-sensing device comprised of a light source and phototransistor (not shown) which cooperates with a registration strip 113 having vertical slits 113a.
- the light source and phototransistor are positioned on opposite sides of registration strip 113 to generate video pulses whenever they are aligned with one of the slits 113a to permit full-step dot columns to be printed.
- Half-step dot columns are printed in between adjacent slits 113a under the control of a logic circuit to be more fully described.
- the paper document is moved in the direction of arrow 114 by pin feed mechanism 115 and 116 under control of form feed, line feed and top of form signals to be more fully described.
- the pin feed mechanisms are selectively coupled to the motor M through clutch mechanisms (not shown for purposes of simplicity) which are activated to provide the appropriate paper movement.
- the printer in addition to providing simultaneous operation of the print heads 101 and 102, also provide for printing in the forward (left to right) direction, as well as the reverse (right to left) direction.
- the data representing the characters and other symbols to be printed is always entered into the printer member in the same order, logical circuitry is provided to assure that the correct dot column patterns are applied to the print heads regardless of the direction of movement of the print heads.
- FIG. 3a shows the shift register 300 comprised of four register sections 301-1 through 301-4 which are cooperatively capable of storing 132 8-bit data words plus a dummy character to provide a large plurality of character combinations representing characters, symbols and other special functions.
- the register length i.e., the number of stages and the number of registers
- the dummy character which is a ONE at DS8, when detected at the output stage indicates that the register is full or that loading of the register with less than a full line of 132 characters has been completed.
- Input 303 serves as the input terminal for shifting each data word applied to input terminals 302 into the left-hand most stages of the shift register sections 301, as will be described in more detail hereinbelow.
- register section 301-1 it is capable of storing 133 pairs of bits and, upon the application of each shift pulse, loading the pair of bits of the data word applied to input terminals 302-1 and 302-2 into its left-hand most stage, while shifting all previously loaded pairs of bits one stage to the right.
- Shift register section 301-1 is provided with output terminals 304-1 and 304-2 for coupling the contents of its right-hand most stage to other circuitry.
- output terminals are coupled, in turn, to respective amplifier stages 305-1 and 305-2, respectively, whose outputs are simultaneously coupled to the output terminals TB1 and TB2, respectively, for coupling to the inputs of other electronic hardware to be more fully described and further for feeding back the pair of bits appearing in the right-hand most stage back to the left-hand most stage of the two-bit register section so as to provide a recirculating shift register.
- the outputs of am plifiers 305-1 and 305-2 are coupled to leads 306-1 and 306-2, respectively, which are coupled to the recirculation inputs 307-1 and 307-2, respectively, for feeding back the contents of the right-hand most stage of the shift register into the left-hand most stage thereof.
- the input of an SRCL signal at terminal 308 is coupled to inputs 307-1 through 307-8 to operate the register in the recirculate mode. Clearing of the shift register is accomplished by loading space codes to clear all stages of the shift register 300 when it becomes necessary to do so, with the circuitry employed therefore to be more fully described hereinbelow.
- FIG. 3b shows the buffer register employed for temporary storage of the data word to be ultimately employed for operating the right-hand or B print head assembly (in a manner to be more fully described).
- the buffer register 310 is comprised of 8 bistable flip-flop stages 311-1 through 311-8, each being capable of storing one of the 8 binary bits transferred thereto from the right-hand most stage of shift register 300 shown in FIG. 3a by means of the output terminals TB1-TB1 respectively.
- the output terminal TB1 is sumultaneously coupled to input terminal 311-1a of bistable 311-1 and to one input of AND gate 312-1, there being one such gate 312-1 through 312-8 associated with each of the remaining bistable stages.
- the remaining inputs of the stages 312-1 through 312-8 are coupled in common to lead 313 which receives the signal CATCG which is generated for a purpose to be more fully described hereinbelow.
- Bistable 311-1 has its output 311-1b coupled to one input of AND gate 314-1,there being a similar such AND gate 314-2 through 314-8 associated with each of the remaining bistables 311-2 through 311-8, respectively.
- the remaining input of each of the gates 314 are coupled in common to lead 315 which receives signal LBD which is generated for a purpose to be more fully described.
- the outputs of gates 312-1 and 314-1 are each coupled to respective inputs of OR gate 316-1 whose output is coupled to inverter stage 317-1 (noting that a similar OR gate and amplifier is provided for each of the remaining bistables 311-2 through 311-8, respectively).
- the outputs of each of the inverters 317-1 through 317-8 appear at output terminals CHADDI CI-IADDS for application of the output of the amplifiers to the respective input stages of the appropriate character generator circuits, as will be more fully described in connection with FIG. 3c.
- the 8-bit data word appearing in the right-hand most stage of shift register 300 is coupled through outputs TBl-TB8 and is either passed by gates 312-1 through 312-8 when the signal CATCG is present so as to be passed through the respective OR gates 316 and amplifiers 317 and appear at outputs Cl-IADD1- CHADD8, or alternatively to be loaded into the bistables 311-1 through 311-8 in the presence of the signal LFFB which is selectively applied to terminal 318.
- the 8-bit word appearing in the righthand most stage of shift register 301 is either passed directly to output leads CHAID1 CI-IADD8 or is temporarily stored in bistables 311-1 through 311-8 and at some later time is gated out by LBD through gates 314 and 316 for a purpose to be more fully described hereinbelow.
- FIG. 30 shows the full-step and half-step character generators 320 and 325, respectively.
- Each of these character generators have a first set of input terminals 320a-1 through 320a-6 and 325a-1 through 325a-6, respectively, a second set of input terminals 32011-1 through 32012- and 32512-1 through 325b-5; and a set of output terminals 3200-1 through 3200-7 and 3250-1 through 3250-7, respectively.
- Input sets 320a-1 through 320a-7 and 325a-1 through 325a-7 are coupled in common to the associated leads Cl-IADD1 through GFIADD7 as is shown.
- Input sets 320b-1 through 320b-5 and 325b-1 through 325b-5 are respectively coupled to input terminals W1 through DCW5 and DGW01 to 5CW05 for receiving full-step and half-step dot column selection signals which are generated by the registration means in a manner to be more fully described.
- the character generators are basically read-only-memories of the MOStype capable of producing a 9X7 clot-matrix for a 64 character set.
- the timing pulse sets DCW1 through DCW5 and DCW01 through DCW05 respectively control the generation of the appropriate enabling signals for the print head assembly solenoids at each of the five full-step positions in the case of character generator 320 and at each of the four half-step positions in the case of the halfstep character generator 325.
- the six bits of information available from the buffer circuitry of FIG. 3b and which are applied to the inputs of the character generators 320 and 325 at 320a-1 through 320a-6 and 325a-1 through 3250-6 respectively. represent six binary bits which identify a character or other symbol.
- the character generators are adapted to provide binary information at their outputs 3200-1 through 3200-7 and 3250-1 through 3250-7 which represent the dots to be printed for a particular dot column.
- the dot column selected is determined by the timing pulses available at inputs 320-1 through 320b-5 and 325b-1 through 32512-5.
- Each timing pulse for the full step" character generator is developed to- 3200-1 t0 3200-7 generates the full step dot patterns gether with the presence of a registration slit, whereas after the occurance of each registration slit and before the occurrence of the next registration slit, in order to provide for half-step printing.
- FIG. 3d there is shown therein the buffer circuits for simultaneously coupling the dot column patterns developed by the character generators to the printing head driving circuits.
- the dot column pattern for the right-hand or B head will be transferred first. This dot column pattern will be applied to input.
- Each dot position signal passes through first and second inverters 332-1 through 332-7 and 333-1 through 333-7 which are connected in cascade.
- the outputs of the inverters 333 are each coupled simultaneously to one input 334-1a of a bistable flip flop 3341-1 and to one input of a gate 335.
- the dot column pattern for the B head is loaded into bistables 334-1 through 334-7 upon the development of the LBD signal which is applied to the inputs of all of the bistables 334 when the dot column pattern is derived from the half-step character generator.
- the digital state of the bistable circuits appearing at the outputs 334-1b through 3341-7b is applied to one input of a gate 336-1 through 336-7 when the signal DGSL1 is present.
- the signal LBD is generated by the presence of either the strobe'delay signal TBDLY) or the center strobe signal (CDRSTB). These enabling signalsare applied to gate 337 whereupon the dot column patterns for the B print head generated by the full-step and halfstep character generators are applied to inputs 331-1 through 331-7 temporarily loaded into bistables 334-1 through 334-7 respectively.
- the transfer of the full-step and half-step dot column patterns for driving the A print head occurs subsequent thereto whereupon the full and half step dot column patterns sequentially appear at inputs 331-1 through 331-7 and are passed by 'gates 335-1 through 335-7 upon the occurrence of the TGSL1 and TGSL2 signals which gate the dot column patterns through gates 335 simultaneously with the gating of the respective full-step and half-step dot column patterns for the B print head through gates 336.
- the TGSL signal is developed when either the strobe signal (STROBE) or the delay strobe signal (DELSTB) are present at their respective inputs to gate 338, causing gate 338 to go high, which condition is applied to gate 339.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Impact Printers (AREA)
- Printers Characterized By Their Purpose (AREA)
Abstract
Description
Claims (13)
Priority Applications (15)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US414645A US3858703A (en) | 1973-01-05 | 1973-11-12 | Bidirectional dual head printer |
CA212,079A CA1007573A (en) | 1973-11-12 | 1974-10-23 | Bidirectional dual head printer |
GB4665074A GB1490561A (en) | 1973-11-12 | 1974-10-29 | Bidirectional dual head printer |
GB2254877A GB1490562A (en) | 1973-11-12 | 1974-10-29 | Bidirectional dual head printer |
NL7414224A NL7414224A (en) | 1973-11-12 | 1974-10-31 | REGULATOR PRESSURE DEVICE. |
DE19742452867 DE2452867C3 (en) | 1973-11-12 | 1974-11-07 | Control device for a dot matrix printer |
CH1493874A CH607151A5 (en) | 1973-11-12 | 1974-11-08 | |
FR7437065A FR2258271B1 (en) | 1973-11-12 | 1974-11-08 | |
JP12961174A JPS5346618B2 (en) | 1973-11-12 | 1974-11-12 | |
BE1006273A BE822043A (en) | 1973-11-12 | 1974-11-12 | IMPROVEMENTS TO MULTI-HEAD LINE PRINTERS |
FR7521086A FR2284462A1 (en) | 1973-11-12 | 1975-07-04 | IMPROVEMENTS TO MULTI-HEAD LINE PRINTERS |
FR7521087A FR2284463A1 (en) | 1973-11-12 | 1975-07-04 | IMPROVEMENTS MADE TO PRINTERS PER LINE OF MULTIPLE HEADS |
FR7535379A FR2296532A1 (en) | 1973-11-12 | 1975-11-19 | IMPROVEMENTS MADE TO PRINTERS PER LINE OF MULTIPLE HEADS |
CA242,998A CA1010793A (en) | 1973-11-12 | 1976-01-06 | Bidirectional dual head printer |
US06/206,553 US4400102A (en) | 1973-01-05 | 1980-11-13 | Multi-color print head |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00321176A US3825681A (en) | 1973-01-05 | 1973-01-05 | Data terminal with dual three-station printing |
US414645A US3858703A (en) | 1973-01-05 | 1973-11-12 | Bidirectional dual head printer |
US06/206,553 US4400102A (en) | 1973-01-05 | 1980-11-13 | Multi-color print head |
Publications (1)
Publication Number | Publication Date |
---|---|
US3858703A true US3858703A (en) | 1975-01-07 |
Family
ID=27394951
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US414645A Expired - Lifetime US3858703A (en) | 1973-01-05 | 1973-11-12 | Bidirectional dual head printer |
US06/206,553 Expired - Lifetime US4400102A (en) | 1973-01-05 | 1980-11-13 | Multi-color print head |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/206,553 Expired - Lifetime US4400102A (en) | 1973-01-05 | 1980-11-13 | Multi-color print head |
Country Status (1)
Country | Link |
---|---|
US (2) | US3858703A (en) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026402A (en) * | 1975-07-28 | 1977-05-31 | Centronics Data Computer Corporation | Incremental line printer |
FR2330542A1 (en) * | 1975-11-05 | 1977-06-03 | Centronics Data Computer | PRINTING DEVICE WITH CHOICE OF TYPOGRAPHIC CHARACTERS |
US4030590A (en) * | 1975-10-03 | 1977-06-21 | Ncr Corporation | Spacing and connecting a plurality of print heads |
US4064800A (en) * | 1976-03-01 | 1977-12-27 | Sperry Rand Corporation | Printer device using time shared hammers |
US4116567A (en) * | 1976-12-22 | 1978-09-26 | Okidata Corporation | Printer synchronization control for shuttle having non-uniform velocity |
US4119383A (en) * | 1976-07-20 | 1978-10-10 | Oki Electric Industry Co., Ltd. | Method and apparatus for inserting intermediate dots in a dot matrix using a dot printer |
EP0001472A1 (en) * | 1977-06-30 | 1979-04-18 | R.C. Sanders Technology Systems Inc. | Method and apparatus for generating alpha-numeric characters for an impact matrix printer |
US4204777A (en) * | 1978-01-16 | 1980-05-27 | Ncr Corporation | Matrix printer control system |
US4213714A (en) * | 1977-11-01 | 1980-07-22 | General Electric Company | Printer having variable character density |
US4242003A (en) * | 1978-10-16 | 1980-12-30 | Xerox Corporation | Multi-pass matrix printing |
US4311399A (en) * | 1977-02-09 | 1982-01-19 | Sycor, Inc. | Method and apparatus for setting and varying margins and line spacing on data printers |
US4326813A (en) * | 1978-10-30 | 1982-04-27 | Digital Equipment Corporation | Dot matrix character printer control circuitry for variable pitch printing |
US4668114A (en) * | 1985-03-08 | 1987-05-26 | Brother Kogyo Kabushiki Kaisha | Printer with a device for preventing print head from interfering with temporary binder portions of multiple-sheet recording medium |
US4681470A (en) * | 1983-01-11 | 1987-07-21 | Ricoh Company, Ltd. | Bidirectional serial printer |
EP0331481A2 (en) * | 1988-03-02 | 1989-09-06 | Canon Kabushiki Kaisha | Recording apparatus in which a plurality of carriages can be connected and separated |
US5496116A (en) * | 1993-05-31 | 1996-03-05 | Kabushiki Kaisha Tec | Article information printer having page and line print modes |
US5606349A (en) * | 1994-03-04 | 1997-02-25 | Diagraph Corporation | Ink jet system with serial data printheads |
US5907334A (en) * | 1988-03-02 | 1999-05-25 | Canon Kabushiki Kaisha | Recording apparatus and method using plural interconnectable carriages that are releasable at a capping position |
EP0982143A2 (en) * | 1998-08-27 | 2000-03-01 | Canon Kabushiki Kaisha | Printing method and apparatus |
US6089766A (en) * | 1997-07-28 | 2000-07-18 | Canon Kabushiki Kaisha | Auto-alignment system for a printing device |
US20060171755A1 (en) * | 2005-01-31 | 2006-08-03 | Bryan Clarke | Dual-head dye-sub thermal transfer printer system and method |
US20060181570A1 (en) * | 2005-02-15 | 2006-08-17 | Grosse Jason C | Uniquely spaced markings |
US20080024540A1 (en) * | 2006-07-27 | 2008-01-31 | Grosse Jason C | Carriage positioning |
US20210060988A1 (en) * | 2019-08-30 | 2021-03-04 | Konica Minolta, Inc. | Image forming apparatus and carriage driving method |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3377632D1 (en) * | 1982-05-18 | 1988-09-15 | Seiko Epson Corp | Wire dot printer adapted to use a plurality of differently coloured inks |
JPS58215370A (en) * | 1982-06-10 | 1983-12-14 | Seiko Epson Corp | Ink type wire dot printer |
US4552472A (en) * | 1983-06-10 | 1985-11-12 | Tokyo Electric Co., Ltd. | Ink dot printer |
US4491433A (en) * | 1983-08-29 | 1985-01-01 | Centronics Data Computer Corp. | Venting and ink recycling device |
US5156473A (en) * | 1983-10-13 | 1992-10-20 | Seiko Epson Corporation | Multi-color cartridge ink-supply system for a dot matrix printer |
US5328279A (en) * | 1984-05-22 | 1994-07-12 | Seiko Epson Corporation | Dot matrix printer head |
US6247803B1 (en) | 1983-10-13 | 2001-06-19 | Seiko Epson Corporation | Ink jet recording apparatus and method for replenishing ink in the tank cartridge |
US6145974A (en) * | 1983-10-13 | 2000-11-14 | Seiko Epson Corporation | Ink-supplied printer head and ink container |
US5156471A (en) * | 1984-05-22 | 1992-10-20 | Seiko Epson Corporation | Ink-supplied wire dot matrix printer head |
US6276785B1 (en) | 1983-10-13 | 2001-08-21 | Seiko Epson Corporation | Ink-supplied printer head and ink container |
EP0139508B1 (en) * | 1983-10-13 | 1991-07-24 | Seiko Epson Corporation | Wire dot matrix printer head |
US5156470A (en) * | 1983-10-13 | 1992-10-20 | Seiko Epson Corporation | Two cartridge ink-supply system for a multi-color dot matrix printer |
DE3471316D1 (en) * | 1983-12-23 | 1988-06-23 | Seiko Epson Corp | Ink for use in an ink wire dot printer |
US5174665A (en) * | 1984-05-22 | 1992-12-29 | Seiko Epson Corporation | Ink-supply system for a dot matrix printer |
EP0406983B1 (en) * | 1984-05-22 | 1994-08-10 | Seiko Epson Corporation | Ink supply tank for a wire dot matrix printer head |
US5221148A (en) * | 1984-05-22 | 1993-06-22 | Takashi Suzuki | Dot matrix printer ink supply system having ink absorbing member substantially filling an ink tank |
SG50609A1 (en) * | 1984-05-22 | 1998-07-20 | Seiko Epson Corp | Dot matrix printer head |
US6474798B1 (en) | 1984-10-11 | 2002-11-05 | Seiko Epson Corporation | Ink supplied printer head and ink container |
US4818133A (en) * | 1986-05-16 | 1989-04-04 | Williams Richard A | High speed wire matrix print head |
US4749291A (en) * | 1986-09-23 | 1988-06-07 | Pentel Kabushiki Kaisha | Inking system for wire dot matrix printer |
US4821748A (en) * | 1987-02-26 | 1989-04-18 | Reas John H | Hand-held cigarette-coloring device |
US5844578A (en) * | 1990-01-30 | 1998-12-01 | Seiko Epson Corporation | Ink-jet recording apparatus and ink tank cartridge thereof |
US6280024B1 (en) | 1993-11-05 | 2001-08-28 | Seiko Epson Corporation | Ink cartridge for printer |
US6238042B1 (en) | 1994-09-16 | 2001-05-29 | Seiko Epson Corporation | Ink cartridge for ink jet printer and method of charging ink into said cartridge |
US7551201B2 (en) * | 1997-07-15 | 2009-06-23 | Silverbrook Research Pty Ltd | Image capture and processing device for a print on demand digital camera system |
US6682183B2 (en) | 2001-06-13 | 2004-01-27 | Nu-Kote International, Inc. | Seal member for ink jet cartridge |
US6923530B2 (en) * | 2001-06-13 | 2005-08-02 | Nu-Kote International, Inc. | Fused filter screen for use in ink jet cartridge and method of assembling same |
US6814433B2 (en) * | 2001-06-13 | 2004-11-09 | Nu-Kote International, Inc. | Base aperture in ink jet cartridge with irregular edges for breaking surface tension of the ink |
US6749293B1 (en) | 2001-06-13 | 2004-06-15 | Nu-Kote International, Inc. | Full liquid version of ink jet cassette for use with ink jet printer |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3167166A (en) * | 1960-04-07 | 1965-01-26 | Int Standard Electric Corp | Printing arrangement for high-speed teleprinters |
US3300017A (en) * | 1965-04-30 | 1967-01-24 | Sperry Rand Corp | Electrosensitive printing apparatus with print head continuously moved across paper |
US3627096A (en) * | 1969-04-25 | 1971-12-14 | Ibm | Wire printing method |
US3638197A (en) * | 1968-12-31 | 1972-01-25 | Texas Instruments Inc | Electronic printing input-output station |
US3670861A (en) * | 1970-09-10 | 1972-06-20 | Extel Corp | Carriage drive for high speed printer |
US3787884A (en) * | 1973-01-08 | 1974-01-22 | Ibm | Ink jet printer |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US414846A (en) * | 1889-11-12 | Stephen t | ||
US2530697A (en) * | 1947-06-27 | 1950-11-21 | Robert H Higgins | Inking device for typewriters |
US3055297A (en) * | 1957-01-14 | 1962-09-25 | Johnson & Son Inc S C | Microporous synthetic resin material |
US3400801A (en) * | 1965-10-23 | 1968-09-10 | Western Union Telegraph Co | Reusable inking cartridge |
FR2155620A5 (en) * | 1971-10-07 | 1973-05-18 | Int Standard Electric Corp | |
DE2152241A1 (en) * | 1971-10-20 | 1973-04-26 | Philips Patentverwaltung | MOSAIC PRINTER |
US3948382A (en) * | 1973-01-29 | 1976-04-06 | The Singer Company | Data terminal printing assembly |
US4030590A (en) * | 1975-10-03 | 1977-06-21 | Ncr Corporation | Spacing and connecting a plurality of print heads |
US4194846A (en) * | 1978-04-28 | 1980-03-25 | Centronics Data Computer Corp. | Dot matrix printing device employing a novel image transfer technique to print on single or multiple ply print receiving materials |
US4210917A (en) * | 1978-07-28 | 1980-07-01 | Honeywell Inc. | Multicolor multipoint recorder |
US4279519A (en) * | 1979-06-01 | 1981-07-21 | Centronics Data Computer Corp. | Dot matrix printing device employing novel image transfer technique for printing on single ply or multiple ply print receiving media |
US4279521A (en) * | 1979-11-02 | 1981-07-21 | International Business Machines Corporation | Wire matrix print head |
-
1973
- 1973-11-12 US US414645A patent/US3858703A/en not_active Expired - Lifetime
-
1980
- 1980-11-13 US US06/206,553 patent/US4400102A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3167166A (en) * | 1960-04-07 | 1965-01-26 | Int Standard Electric Corp | Printing arrangement for high-speed teleprinters |
US3300017A (en) * | 1965-04-30 | 1967-01-24 | Sperry Rand Corp | Electrosensitive printing apparatus with print head continuously moved across paper |
US3638197A (en) * | 1968-12-31 | 1972-01-25 | Texas Instruments Inc | Electronic printing input-output station |
US3627096A (en) * | 1969-04-25 | 1971-12-14 | Ibm | Wire printing method |
US3670861A (en) * | 1970-09-10 | 1972-06-20 | Extel Corp | Carriage drive for high speed printer |
US3787884A (en) * | 1973-01-08 | 1974-01-22 | Ibm | Ink jet printer |
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026402A (en) * | 1975-07-28 | 1977-05-31 | Centronics Data Computer Corporation | Incremental line printer |
US4030590A (en) * | 1975-10-03 | 1977-06-21 | Ncr Corporation | Spacing and connecting a plurality of print heads |
FR2330542A1 (en) * | 1975-11-05 | 1977-06-03 | Centronics Data Computer | PRINTING DEVICE WITH CHOICE OF TYPOGRAPHIC CHARACTERS |
US4064800A (en) * | 1976-03-01 | 1977-12-27 | Sperry Rand Corporation | Printer device using time shared hammers |
US4119383A (en) * | 1976-07-20 | 1978-10-10 | Oki Electric Industry Co., Ltd. | Method and apparatus for inserting intermediate dots in a dot matrix using a dot printer |
US4116567A (en) * | 1976-12-22 | 1978-09-26 | Okidata Corporation | Printer synchronization control for shuttle having non-uniform velocity |
US4311399A (en) * | 1977-02-09 | 1982-01-19 | Sycor, Inc. | Method and apparatus for setting and varying margins and line spacing on data printers |
EP0001472A1 (en) * | 1977-06-30 | 1979-04-18 | R.C. Sanders Technology Systems Inc. | Method and apparatus for generating alpha-numeric characters for an impact matrix printer |
US4213714A (en) * | 1977-11-01 | 1980-07-22 | General Electric Company | Printer having variable character density |
US4204777A (en) * | 1978-01-16 | 1980-05-27 | Ncr Corporation | Matrix printer control system |
US4242003A (en) * | 1978-10-16 | 1980-12-30 | Xerox Corporation | Multi-pass matrix printing |
US4326813A (en) * | 1978-10-30 | 1982-04-27 | Digital Equipment Corporation | Dot matrix character printer control circuitry for variable pitch printing |
US4681470A (en) * | 1983-01-11 | 1987-07-21 | Ricoh Company, Ltd. | Bidirectional serial printer |
US4668114A (en) * | 1985-03-08 | 1987-05-26 | Brother Kogyo Kabushiki Kaisha | Printer with a device for preventing print head from interfering with temporary binder portions of multiple-sheet recording medium |
US5018884A (en) * | 1988-03-02 | 1991-05-28 | Canon Kabushiki Kaisha | Recording apparatus in which a plurality of carriages can be connected and separated |
EP0331481A3 (en) * | 1988-03-02 | 1990-04-11 | Canon Kabushiki Kaisha | Recording apparatus in which a plurality of carriages can be connected and separated |
EP0331481A2 (en) * | 1988-03-02 | 1989-09-06 | Canon Kabushiki Kaisha | Recording apparatus in which a plurality of carriages can be connected and separated |
US5166708A (en) * | 1988-03-02 | 1992-11-24 | Canon Kabushiki Kaisha | Recording apparatus having plural suction recovery caps |
US5907334A (en) * | 1988-03-02 | 1999-05-25 | Canon Kabushiki Kaisha | Recording apparatus and method using plural interconnectable carriages that are releasable at a capping position |
US5496116A (en) * | 1993-05-31 | 1996-03-05 | Kabushiki Kaisha Tec | Article information printer having page and line print modes |
US5606349A (en) * | 1994-03-04 | 1997-02-25 | Diagraph Corporation | Ink jet system with serial data printheads |
US5825375A (en) * | 1994-03-04 | 1998-10-20 | Diagraph Corporation | Ink jet system with serial data printheads |
US6089766A (en) * | 1997-07-28 | 2000-07-18 | Canon Kabushiki Kaisha | Auto-alignment system for a printing device |
EP0982143A2 (en) * | 1998-08-27 | 2000-03-01 | Canon Kabushiki Kaisha | Printing method and apparatus |
EP0982143A3 (en) * | 1998-08-27 | 2000-11-02 | Canon Kabushiki Kaisha | Printing method and apparatus |
US6322197B1 (en) | 1998-08-27 | 2001-11-27 | Canon Kabushiki Kaisha | Printing method and apparatus |
US20060171755A1 (en) * | 2005-01-31 | 2006-08-03 | Bryan Clarke | Dual-head dye-sub thermal transfer printer system and method |
US20060181570A1 (en) * | 2005-02-15 | 2006-08-17 | Grosse Jason C | Uniquely spaced markings |
US7699435B2 (en) | 2005-02-15 | 2010-04-20 | Hewlett-Packard Development Company, L.P. | Uniquely spaced markings |
US20080024540A1 (en) * | 2006-07-27 | 2008-01-31 | Grosse Jason C | Carriage positioning |
US7654629B2 (en) | 2006-07-27 | 2010-02-02 | Hewlett-Packard Development Company, L.P. | Carriage positioning |
US20210060988A1 (en) * | 2019-08-30 | 2021-03-04 | Konica Minolta, Inc. | Image forming apparatus and carriage driving method |
Also Published As
Publication number | Publication date |
---|---|
US4400102A (en) | 1983-08-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3858703A (en) | Bidirectional dual head printer | |
US3991868A (en) | Method and apparatus for printing segmented characters | |
US2936704A (en) | High speed printing apparatus | |
US3802544A (en) | High speed dot matrix printer | |
US3167166A (en) | Printing arrangement for high-speed teleprinters | |
US3789969A (en) | High speed printer | |
US3803628A (en) | Apparatus and method for postionally controlled document marking | |
US3703949A (en) | High-speed printer | |
US4037705A (en) | Descender printing system for dot matrix printer | |
GB1586589A (en) | Printing systems | |
US3291041A (en) | Page printer mechanism with tilting and travelling print head | |
US3893558A (en) | Special symbol generator for high speed printer | |
US4026402A (en) | Incremental line printer | |
GB2243808A (en) | Deriving draft quality dot patterns from letter quality dot patterns in matrix printers | |
RU2088969C1 (en) | Printer | |
US4248147A (en) | Control system for dot matrix line printer using one print element per character | |
US3742846A (en) | Wire printer with print head moved in figure eight pattern | |
US3810195A (en) | Helical bar printer logic circuitry | |
US3823397A (en) | Serial to parallel converter for binary signals of two different pulse widths | |
US3845710A (en) | Print control logic circuitry for on-the-fly printers | |
US4096935A (en) | Input device | |
US3282205A (en) | Print control means for high speed printer with traveling print bar | |
US3196404A (en) | Printer buffer load and read control means | |
US3399619A (en) | Type arrangement in endless band line printers | |
US3924723A (en) | Centering of textual character fields about a point |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON THE, AS AGENT Free format text: SECURITY INTEREST;ASSIGNOR:CENTRONICS DATA COMPUTER CORP.;REEL/FRAME:003984/0799 Effective date: 19811119 Owner name: FIRST NATIONAL BANK OF BOSTON, THE, AS AGENT, MASS Free format text: SECURITY INTEREST;ASSIGNOR:CENTRONICS DATA COMPUTER CORP.;REEL/FRAME:003984/0799 Effective date: 19811119 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON, THE (AS AGENT) Free format text: SECURITY INTEREST;ASSIGNOR:CENTRONICS DATA COMPUTER CORP.;REEL/FRAME:003980/0280 Effective date: 19811119 Owner name: FIRST NATIONAL BANK OF BOSTON, THE (AS AGENT), MAS Free format text: SECURITY INTEREST;ASSIGNOR:CENTRONICS DATA COMPUTER CORP.;REEL/FRAME:003980/0280 Effective date: 19811119 |
|
AS | Assignment |
Owner name: GENICOM CORPORATION, ONE GENICOM DRIVE, WAYNESBORO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CENTRONICS DATA COMPUTER CORP. BY CHANGE OF NAME CENTRONICS CORPORATION;REEL/FRAME:004779/0557 Effective date: 19871028 Owner name: GENICOM CORPORATION, A DE. CORP.,VIRGINIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CENTRONICS DATA COMPUTER CORP. BY CHANGE OF NAME CENTRONICS CORPORATION;REEL/FRAME:004779/0557 Effective date: 19871028 |
|
AS | Assignment |
Owner name: GENICOM CORPORATION, ONE GENICOM DRIVE, WAYNESBORO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CENTRONICS DATA COMPUTER CORP.,;REEL/FRAME:004834/0870 Effective date: 19880126 Owner name: GENICOM CORPORATION, A DE. CORP., VIRGINIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CENTRONICS DATA COMPUTER CORP.,;REEL/FRAME:004834/0870 Effective date: 19880126 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
|
AS | Assignment |
Owner name: CHEMICAL BANK, A NY BANKING CORP., NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:GENICOM CORPORATION, A CORP. OF DE.;REEL/FRAME:005370/0360 Effective date: 19900427 |
|
AS | Assignment |
Owner name: FIDELCOR BUSINESS CREDIT CORPORATION, 810 SEVENTH Free format text: SECURITY INTEREST;ASSIGNOR:GENICOM CORPORATION;REEL/FRAME:005521/0609 Effective date: 19900925 Owner name: GENICOM CORPORATION, GENICOM DRIVE, WAYNESBORO, VA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHEMICAL BANK;REEL/FRAME:005521/0662 Effective date: 19900926 |