CN102574395B - Multichannel - printhead or dosing head - Google Patents
Multichannel - printhead or dosing head Download PDFInfo
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- CN102574395B CN102574395B CN201080036422.4A CN201080036422A CN102574395B CN 102574395 B CN102574395 B CN 102574395B CN 201080036422 A CN201080036422 A CN 201080036422A CN 102574395 B CN102574395 B CN 102574395B
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- Prior art keywords
- fluid
- pneumatic
- valve
- printhead
- path
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Classifications
-
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
-
- 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
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14483—Separated pressure chamber
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/05—Heads having a valve
Abstract
A Printhead, particularly suitable for viscous or particle-filled fluids, with multiple channels is proposed. A channel of the printhead is characterized by a micro-electro-pneumatic circuit 2 containing a series circuit between a first and second pressure level out of a micro-valve 18 and a pneumatic throttle 23, for generating a control pressure p c at the common pneumatic node 5 of micro-valve 18 and pneumatic throttle 23, further a drop-on- demand fluid ejector 4 with a diaphragm 8 actuated by the control pressure pc, the fluid ejector 4 controlling the fluid discharge through fluid outlet 6.
Description
Technical field
The present invention relates to printing or printhead, for the printing on surface or three-dimensional structure, dispense liquid, be called for short printing hereinafter.Particularly, the present invention relates to the printing using printhead, distributor or other similar device, these devices are hereinafter referred to as printhead, and it has multiple fluid issuing 6, and these fluid issuings 6 arrange in geometrically regular pattern, preferably by rows.The invention still further relates to printing or the distribution of fluid, wherein the volume range of fluid is that per injection (per shot) is received and upgraded to milliliter level, fluid has medium-viscosity (up to 1Pas), described fluid also can comprise concentration up to 90% particle (grain size: 0.3mm), speed is up to kHz, and pitch is low to moderate millimeter.The present invention is specifically related to use mobile device to print, and described mobile device should be lighter, by trouble free service in acceleration situation, and does not reveal.
Background technology
Current ink jet-print head is suitable for discharge frequency, and it mainly works according to displacement of fluid principle (fluid displacement principle).Its use is limited to the fluid of viscosity lower than 25mPas.According to the work of displacement of fluid principle, for the printhead of the fluid of viscosity higher also by using powerful piezoelectric pile formula driver (piezo stack actuators) to realize.But, pitch can not be realized and be less than 4mm, lightweight, be suitable for processing the multi-path printhead that drop speed is the moderately viscous fluid of kHz scope.
As US5,119,110 and US5,356, the printhead on the valve technology basis in 034 is also suitable for operating frequency.With compared with the printhead of displacement of fluid principle work, they have the advantage of the higher-energy needed for discharge being provided for viscous fluid by pressure source.But, because higher fluid viscosity, also need higher switching energy for changing described fluid stream, electromagnetism (the US5 of valve technology type as is known, 356,034) or piezoelectricity (US2009/0115816) printhead provide, thus meet the requirement of the present invention about fluid property, pitch, drop frequency and drop weight.
Summary of the invention
The present invention utilizes printhead as described below to solve foregoing invention problem.
In addition, the invention discloses and use the printhead 1 with multiple electrically addressable path to carry out printing, measure or the method for distributing fluids, each path uses micro-electro-pneumatic loop (micro-electro-pneumatic-circuit) electric control signal to be converted into the pneumatic control pressure p with more macro-energy
c, the barrier film of this controlled pressure drive fluid injector, thus realize the fluid drainage of final displacement of fluid or valve opening part.
The invention discloses the apparatus and method of carrying out printing, distribute or measuring a phase or heterogeneous fluid, emulsion or dispersion by printhead 1, described fluid, emulsion or dispersion have or do not have solids content, range of viscosities is high to 1Pas, described printhead 1 has small size and low weight, fluid tip spacing is about 1/10th grades to grade, drop speed is up to kHz scope, and variable drop size upgrades to micro updating from skin.
The invention discloses and carry out by multi-path printhead the apparatus and method that print, distribute or measure, described printhead comprises micro-electro-pneumatic loop, for controlling one or more pneumatic fluid injector.
The invention discloses the apparatus and method that the printhead 1 by having multiple path prints, distributes or measures, it comprises micro-electro-pneumatic loop, contains the device of the pneumatic control signal low-energy electric control signal being converted to higher-energy.
The invention also discloses apparatus and method electric control signal being converted to pneumatic control signal, these apparatus and method make electricity consumption/gas transducer, preferred use magnetic or piezoelectricity pneumatic operated valve, preferably use miniature valve 18 further, and use other pneumatic element to provide fluid to limit.
The invention also discloses the apparatus and method using the printhead 1 with multiple path to print, distribute or measure, described apparatus and method comprise fluid ejector 4, and this injector 4 runs according to displacement principle or valve principle (valve principle).
The invention also discloses the apparatus and method using printhead 1 to print, distribute or measure, described apparatus and method comprise the structure of the feature containing type identical with multi-path injector.
The invention also discloses the apparatus and method using printhead 1 to print, distribute or measure, described apparatus and method comprise the structure of the feature containing multi-path electric loop.
The invention also discloses and use the printhead 1 with barrier film 8 to print, the apparatus and method of distributing or measuring, described barrier film extends to one or more path, described pneumatic energy is passed to corresponding injector, fill up or compress opening, thus anti-fluid is by described opening, or displacement fluids, thus spray fluid by one or more corresponding fluid issuing, or exhaust fluid, fluid is sprayed by fluid issuing, until described barrier film 8 contacts with relevant fluid issuing, close this outlet, thus interrupt suddenly the flowing of fluid, separate the fluid discharged.
The invention also discloses and rely on new or different configuration, the apparatus and method of rapid alter transfer unit.
The invention also discloses the apparatus and method for integrated described control electronic device, described control electronic device is used in particular for pneumatic electricity/gas transducer, controls electronic device with described in air cleaning, thus gets rid of heat from described control electronic device.
Industrial applicibility
Use printhead of the present invention can dosage or the multiple fluid that prints in multiple application.Within the scope of the invention, fluid is called liquid, and this liquid can flow freely or flow under stress, containing a phase or heterogeneous, and has viscosity profile, comprises the value lower than 1Pas in its viscosity-shear stress indicatrix at least partly.Concrete, the fluid with thixotropy or Pseudo plastic can be processed.Heterogeneous fluid can be the fluid having soluble particle, fluid drop or embed the bubble in fluid.Enumerate the example and purposes that only specify accessible fluid below: the aqueous solution, prepared Chinese ink, pigment (wall finiss, emulsion paint, coloring earth, the printing of art paint), varnish, mortar (mortar, the printing of plaster), liquid polymers, the liquid polymers (such as: rapid prototyping) of ultraviolet-curing, wax, adhesive and resin, that fill or unfilled, grease, the printing of oil, the printing of various fluid all can be used for printing technique field in principle, such as prepared Chinese ink, pigment, partial cross-linked liquid, high-viscosity material or body fluid (blood, saliva), the fluid of making food, the reagent of medical science or biomedicine or biological field or component, comprise before application, in application or produce the printing of liquid of foam after application.Also fluid can be interpreted as gas, can be measured under high power capacity and high-frequency by device of the present invention or method.
The preferable use of printhead of the present invention is the printhead as printing particulate load liquid, the scope of the particle diameter that described particle has up to 1/10th millimeters.Preferably, printhead of the present invention is painted by printing wall finiss or emulsion paint or draws on metope on metope, particularly preferably, uses the hand held printer of light-duty, powerful printhead.Or with thick membrane technology printing slurry (such as conductibility, insulating properties or resistive slurry) or slurry (glass paste or other) or food.
Another preferable use of printhead of the present invention is making three-dimensional structure, such as, in speed forming method or for printing Braille.
Accompanying drawing explanation
With reference to accompanying drawing, hereinafter in detail the typical embodiment of difference of apparatus and method of the present invention will be described.
Fig. 1 illustrates the present invention and uses printhead 1 to carry out the apparatus and method printing, distribute or measure.
Fig. 2 show in more detail the present invention and uses printhead 1 to carry out the apparatus and method printing, distribute or measure.
Fig. 3 illustrates the embodiment of micro-pneumatic circuit of the present invention.
Fig. 4 illustrates the embodiment of the injector of the present invention run according to valve principle.
Fig. 5 illustrates the embodiment of the injector of the present invention run according to displacement of fluid.
Fig. 6 illustrates the embodiment of the injector of the present invention run according to valve principle.
Fig. 7 illustrates the preferred embodiment of printhead 1 of the present invention.
Fig. 8 illustrates the preferred embodiment of the printhead be made up of checker plate, and each checker plate comprises the structure of similar printhead path.
Fig. 9 illustrates the preferred embodiment of the printhead that the present invention is made up of checker plate.
Detailed description of the invention
Fig. 1 illustrates the block diagram of the apparatus and method of the present invention of a path for printhead.Term print head should represent printhead, and printhead does not have clear and definite to be limited to these.Printhead is construed as a kind of device usually, and for the surface continuously or off and on coating fluid by path which kind of class in office non-contiguously, described path is spaced apart regularly and be that electronics independently controls.According to terminology used here, path is the minimum addressable unit of electronic printable head 1.Path also can have multiple fluid issuing.Printhead also can comprise contactless fluid application, and such as irrelevant with direct release of fluid common metering and fluid control to apply.
The low-energy electric control signal of each path is changed into the pneumatic control signal (as Fig. 1) of higher-energy by apparatus and method of the present invention by micro-electro-pneumatic loop.Extra energy source is in one or more pressure source p
1, p
2, hereinafter referred to as stress level.Micro-electro-pneumatic loop 2 is interpreted as the network of micro-electrical pneumatic element.These can be, such as electricity/gas transducer, gas/mechanical transducer, pneumatic throttle, dead volume, pipe and chamber.
The described pneumatic control signal p of each path
cfor driving at least one pneumatic fluid injector.Pneumatic fluid injector 4 is interpreted as a kind of device, makes response to the pneumatic control pressure be applied on barrier film, sprays fluid from one or more fluid issuing.Barrier film also can represent other suitable air impeller, such as flexible board, (rectangle, oval with the fluid line of the film of suspension or plate, moveable piston, corrugated tube or inflatable part, flexible pipe or other shape of cross section ...).
Fig. 2 illustrates described micro-electro-pneumatic loop of apparatus and method of the present invention and the pneumatic fluid injector of electronics addressable path n in detail.
Micro-electro-pneumatic loop 2 comprises by being in the first stress level p
1with the second stress level p
2between the first pneumatic element and the series loop of the second pneumatic element composition, described first pneumatic element is miniature valve 18, and the second pneumatic element is choke valve 23, produces angry dynamic control signal or simple controlled pressure p whereby at common pneumatic node 5
c, the pneumatic barrier film being connected at least one fluid ejector of this controlled pressure.
Use about word " pneumatic " it should be noted that to use any gas, or even hydraulic fluid replaces air as pressure agents.Title " micro-pneumatic " in the present invention should not be considered as the restriction using air as pressure agents.
Fluid ejector of the present invention is a part for printhead 1, and this fluid ejector is based on drop-on-demand principle displacement fluids.This fluid ejector comprises at least one fluid intake and at least one fluid issuing.Pneumatic fluid injector is in pneumatic energy, is at controlled pressure p herein
cby fluid ejector that barrier film runs under help.
Printhead of the present invention can work according to displacement of fluid principle, and such as described injector 4 is by controlled pressure p
cthe fluid displacement apparatus driven.According to displacement principle, by reducing the volume in the chamber of fluid filling, the fluid in chamber is transferred in the mechanically deform of barrier film or motion, thus fluid is discharged by described fluid issuing 6.Printhead of the present invention also can work according to valve principle, and such as described injector is according to the work of valve principle, and barrier film 8 serves as valve diaphragm.
The embodiment in the micro-electro-pneumatic loop for single path is described in Fig. 3.Each micro-electro-pneumatic loop comprises the pneumatic control pressure port being positioned at bottom, is provided for the controlled pressure p driving described fluid ejector
c.
Described micro-electro-pneumatic loop comprises and is positioned at two stress level p
1and p
2between pneumatic element Z
1with pneumatic element Z
2series loop, in chamber, its common pneumatic node 5 place, produces and at least comprises the interim controlled pressure p of two states
c, thus operate described fluid ejector.In fact pressure source can be designed to pump, compressor or vavuum pump (Pabs<1bar).In literary composition of the present invention, the opening towards environment is interpreted as the pressure source (p=p with environmental pressure
u).
According to the present invention, two pneumatic element Z
1or Z
2in at least one comprise electricity/gas transducer, the pneumatic operated valve of such as electric control.This pneumatic operated valve can run according to any transducer principle, such as piezoelectric principle, electromagnetic principle, electropneumatic principle, electrostatic principle or electrostriction principle, and there is short response time T<<1ms and little dead volume.Preferably according to the valve that piezoelectric principle works, due to the electric amplification in micro-electro-pneumatic loop, the size of this valve can be little especially.So hereinafter, usually use term " miniature valve " 18.
According to the present invention, described pneumatic element Z
1or Z
2in at least one comprise miniature valve V
1, another is minitype pneumatic valve V
2or pneumatic throttle 23.At latter event, described miniature valve V1 is valve unique in each path.The feature of pneumatic throttle is their loss effect and linear or non-linear flow dynamic resistance, when fluid flows, pressure is reduced like this.The example of pneumatic throttle is capillary 23, hole, fluid change direction and change or the change of cross section.It shall yet further be noted that pneumatic element Z
1or Z
2can be not only single pneumatic throttle or miniature valve 18, also can comprise these combination, even comprise pneumatic circuit.
According to the present invention, described injector 4 is pneumatically connected to Z
1and Z
2between node 5, at this node 5 place, according to the valve position of described miniature valve 18, on demand setup control pressure p
cto control described fluid ejector.Pneumatic node 5 comprises pipeline and chamber, and described pipeline and chamber extend to described pneumatic element Z
1and Z
2effective coverage and the pneumatic end of described fluid ejector, thus there is volume V
k.Swept volume-volume the V of injector
ealso add in above-mentioned volume.Due to the compressibility of air, described volume V
k+ V
ethere is pneumatic adaptability.The speed that the state which has limited described controlled pressure changes.Learn volume V
k+ V
esize, can calculate the time constant of conversion operations, it is to described micro-electro-pneumatic loop and the structure relevant (as follows) of described fluid ejector:
T
1＝R*p
o/(Vκ+V
E) (1)
Wherein R depends on considered conversion operations, equals at Z
1or Z
2in the fluid resistance of miniature valve 18 opened or the flow resistance equaling described pneumatic throttle 23.Depart from (clean fluid tear-off) to realize fluid completely on injector 4, the pressure change of described controlled pressure should be highly dynamic.According to the present invention, the described loop element in micro-electro-pneumatic loop limits size in some way, thus described pneumatic control signal p
cthe time constant that changes of state preferably in the scope of 1 microsecond to 1 millisecond, especially preferred in the scope of 1 microsecond to 100 microsecond.High operating frequency, low weight and undersized requirement need to use miniature valve 18, and on the other hand, miniature valve 18 only comprises the valve journey of about 0.05mm.As a result, described in, the flow resistance of miniature valve 18 opened has relevant progression, therefore according to formula (1), only when by volume V
kand V
etime microminiaturized, just can obtain enough little time constant.
In order to effectively drive pneumatic fluid injector, an object is the height difference of the final pressure level making controlled pressure.Another object be maintained by described in the minitype pneumatic valve 18 opened and described pneumatic throttle specific air consumption little.Two objects all show the flow resistance R that will select pneumatic throttle 23
dapparently higher than the flow resistance Rv of the described miniature valve opened, such as 10 times.But this size restriction has shortcoming, namely after the described miniature valve 18 of closedown, due to the decline of the controlled pressure by described pneumatic throttle 23, time constant in formula (1) becomes large, this (depends on the structure of described injector, as follows) again and is unfavorable for that fluid discharges completely or fluid departs from.According to formula (1), remain only as volume V
kand V
eduring reduction, realize the short response time.According to the present invention, the element in described minitype pneumatic loop is microminiaturized element and/or structure, especially as described volume V
kand V
etime microminiaturized.But microminiaturization limit by the following fact, namely the flow resistance of Pneumatic pipe goes up mutually can not ignore again in size compared with the flow resistance of such as pneumatic throttle.Now, should change discontinuous path, to be conducive to continuous mode, in discontinuous path, such as pneumatic throttle is by as discontinuous pneumatic element Z
2.Therefore, according to the present invention, pneumatic element Z
1and Z
2be not limited to discontinuous pneumatic element, and should regard a part for the device with pneumatic function as, such as pneumatic throttle works, if pneumatic element Z between geometric first and second point
2, then point and the applying pressure p of setup control pressure is positioned at
2point between work.
Embodiment as shown in Figure 3, described electrically driven (operated) miniature valve 18 preferably has the piezo electric valve of piezoelectric bending transducer.Each piezoelectric bending transducer comprising single configuration of these embodiments such as, is d
31the laminated piezoelectric transducer of operator scheme, its substrate is made up of the material of non-piezoelectric, elongated shape, when with voltage being the charging of described piezoelectric element, the end deflection that can move freely is perpendicular to the direction of described substrate side, and described piezoelectric element is positioned on described substrate.Suitable monotype transducer has, and such as gross thickness is less than 0.5mm, and drift is 5-10mm, far below the width of 1mm.The free end of described piezoelectric actuator covers valve opening 9, this valve opening is provided with sealing surface, is called valve seat herein.Fig. 3, A and Fig. 3, the structure in B comprises the first pneumatic impedance Z of described monotype piezoelectric micro valve 18 form
1with the second impedance Z of capillary form
2.
Described in detailed consideration hypothesis, there is p below
1>p
2the described micro-electro-pneumatic loops of two pressure sources supply.Therefore, described controlled pressure p
conly can at p
1and p
2between value.Described piezoelectric micro valve 18 is positioned at chamber, and this chamber depends on by pressure p
1or p
2the operator scheme in described micro-electro-pneumatic loop of supply.Described capillary 23 is connected with described miniature valve 18 and described controlled pressure port in side, opposite side and remaining pressure source p
2or p
1be connected.
Fig. 3, A illustrate two kinds of operator schemes of micro-electro-pneumatic driver of the present invention, and wherein piezo electric valve is configured to normally closed, and such as, under non-piezoelectric drive condition, described valve is closed.In the operator scheme 1 of Fig. 3, A, higher pressure p
1be applied on miniature valve 18.This miniature valve 18 closes, and produces pressure drop p completely
1-p
2.So control output to equal p
c=p
2.When valve described in electric drive is opened and is produced through described capillary 23, above-mentioned pressure drop, p
c=A* (p
1-p
2).So described micro electric air circuit does not turn to behavior, namely electric control voltage produces the increase of described controlled pressure.Operator scheme 1 in Fig. 3, A preferably with use together with the fluid ejector 4 of displacement of fluid principle work.
In the operator scheme 2 of Fig. 3, A, described pressure source is put upside down, further piezo electric valve described in prestrain in some way, and namely firmly its free end is pressed on valve seat by F, thus only when being greater than the pressure p defined thus
gtime, described valve just can be opened.Described in electric drive during valve, miniature valve 18 and described pressure p
gthe power F of acting in conjunction opposing prestrain, to open described valve.So under non-driven state, controlled pressure equals p
c=p
g, Pressure Drop is extremely close to p at any driving condition
2.Therefore, described micro-electro-pneumatic loop table reveals and turns to behavior.Operator scheme 2 in Fig. 3, A preferably with use together with the fluid ejector 4 of valve principle work because under the non-driven state of electricity, the valve diaphragm 8 of such as described fluid valve is by pressure p
g-p
f1press to described fluid bore.
Fig. 3, B illustrate two kinds of operator schemes of micro-electro-pneumatic driver of the present invention, and wherein piezo electric valve is configured to normally to open.By consideration similar in Fig. 3, A, we obtain following results:
In the operator scheme 1 of Fig. 3, B, described micro-electro-pneumatic loop has and turns to behavior, and in Fig. 3, B operator scheme 2, micro-electro-pneumatic loop does not turn to behavior.Therefore, several possibilities combined from different injector are also similar.
The feature in the micro-electric loop shown in Fig. 3, A and B is, in the open mode position of miniature valve 18, produce fixing specific air consumption, its flow resistance primarily of described capillary 23 is determined.When by when size limits suitably, especially by the microminiaturization of described capillary 23, the specific air consumption that adjustable (throttling) is low.But this means the pressure p on described capillary 23
cthe foundation of (depending on structure) or the corresponding time constant of decline will become greatly, and the requirement of the sealing of described miniature valve 18 improves.The further common ground in described micro-electro-pneumatic loop is, the usual described side of miniature valve 18 containing valve opening, the side namely with less dead volume is connected to node 5, and (it connects Z
1and Z
2, and in this setup control pressure p
c) connect.
Fig. 3, C illustrate micro-electro-pneumatic loop 2, and it does not show fixing specific air consumption, comprise and replace described pneumatic throttle as Z
2the second miniature valve 18.If two miniature valves 18 configure similar (open normally or close normally, be not shown herein), so described micro-electro-pneumatic loop operates in two reciprocal modes of miniature valve.In operator scheme, two miniature valves 18 are used to replace a miniature valve to have following advantage: first, described controlled pressure level directly equals stress level p
1and p
2, only have very little deviation.The second, the pneumatic conversion time for two transfer processes is minimum.Shortcoming is higher manufacturing cost and space requirement.In Fig. 3, C, valve is configured to the valve normally opened, and another is configured to normally closed valve.A piezo electric valve can be avoided so forever must to keep driving condition, such as compressive state.
Fig. 4 illustrates the fluid ejector 4 according to the work of valve principle.It should be noted, the invention is not restricted to illustrated embodiment, these embodiments only form the example of possible embodiment, because described injector 4, especially the type of the executive component of injector is non-essential in the present invention, as long as its total design show goes out required pneumatic control valve effect, there is enough little response time and sufficiently high throughput of fluid amount just passable.
Described valve principle is basically continuous operation principle, and it can be used for producing fixing Fluid injection.By the printing using very short valve opening time (about microsecond is to millisecond) that need based jet can be carried out, simultaneously by using variable valve opening time can obtain variable distribution volume.
Fig. 4, A illustrate the embodiment of diaphragm valve as fluid ejector 4.The driving element of barrier film 8 form, controlled pressure p
cpressurization and its side, make it contact with sealing surface 10, as controlled pressure p
cexceed fluid pressure p
f1time, valve opening 9 closes, and this opening is connected to described fluid issuing 6 (Fig. 4, A, the left side).On the contrary, if controlled pressure p
cbe less than fluid pressure, fluid pressure will lift described barrier film 8 from described sealing surface 10, fluid is flowed into by described valve opening 9, and discharges from injector 4.Diaphragm valve provides high sealing (elasticity due to described barrier film), high-speed operation (due to the block that described barrier film is very little) and is easy to the advantage of manufacture.In the present invention, the chivalrous definition that the use of term " barrier film " will be not limited to for using in science of strength for materials, barrier film only can transmit pulling force.On the contrary, in this article, this term also may extend to the situation of " plate ", and it can transmit bending moment, and namely barrier film can be made up of harder material or have thickness, the definition that this meets usually " plate ".Material about described barrier film does not also limit in the present invention, suitable material such as, metal, thin glass, silicon, SiN, thermoplastic (such as PTFE, E/TFE, PFA, PVC, ABS, SAN, PP, PA, POM, PPO, PSU, PEBA, PEEK, PEI, title according to ISO 1043.1), thermoplastic elastomer (TPE) (TPE), elastomer (such as NBR, HNBR, CR, XNBR, ACM, AEM, MQ, VMQ, PVMQ, PMQ, FVMQ, FKM, FFKM, AU, EU, ECO, CSM, NR, IR, BR, SBR, EPDM, EPM, IIR, CIIR, BIIR, TPE, description according to ISO 1629), polyimides, rubber and vulcanized rubber, natural/synthetic rubber, thermosets (such as UP, PF, UF, UP-GF, description according to ISO 1043.1), all polymer, comprise filling or fibre-reinforced polymer.
A modification of printhead of the present invention is, described injector 4 is two diaphragm valves, by controlled pressure p
cdrive.Fig. 4, B illustrate two diaphragm valve, as another embodiment of fluid ejector 4.Replace the single barrier film 8 used as shown in Fig. 4, A, its function driving in conjunction with valve and seal, realize these functions respectively herein.First barrier film 8 with area A 1 is subject to the effect of static pressure, and this static pressure is passed to the potted component sealing described valve by coupling element 12.Fluid contacts with the second barrier film 8, and described second barrier film 8 has area A 2, and is connected to coupling element and potted component 11.Described coupling element can think insert, the ball such as inserted or cylinder, or can think the compound together with described first barrier film 8 and/or the second barrier film 8.First barrier film, coupling element, the second barrier film 8 and potted component can be single coherent structures, such as, be made up of elastomeric material.A2<A1, by controlled pressure p
c1<p
fIenough axial forces and surface pressing can be obtained, for sealing described valve opening.As described in embodiment, described pair of diaphragm valve has two ports for controlled pressure, to keep two controlled pressure p
c1and p
c2in one constant, and drive another by described micro-electro-pneumatic loop, these two ports can be supplied by different combinations, thus two diaphragm valve has meaning.
Such as by static pressure p
st=p
f1supply p
c1, and the controlled pressure in described micro-electro-pneumatic loop is connected to p
c2.Work as p
c2during increase, due to effective fluid pressure p
fIin pressure p
c2arrive the stress level p of fluid before
fI, described fluid valve is opened.On the contrary, the controlled pressure supply p that also can be provided by described micro-electro-pneumatic loop
c1, such as, work as p
c2when remaining unchanged at atmosheric pressure.
Fig. 4, C illustrate single diaphragm valve, and it comprises mechanical couplings and sealing device, as another embodiment of the fluid ejector 4 that barrier film drives.The bar 12 sealed by radial seal by the Movement transmit of described barrier film to valve seal 11.By applying the suitable combination of static pressure and controlled pressure, utilize port p
c1and p
c2complete driving.
Other embodiment of the pneumatic fluid valve do not shown herein, the mechanical drive element of all types and form, potted component or transformational structure can be comprised, such as inclination-lever element (tipping-and leveraging elements), pneumatic deformable corrugated tube, flexible pipe or balloon or air rammer, to close or to open valve opening 9.
In order to explain apparatus and method of the present invention, illustrate the different exemplary embodiments of pneumatic fluid injector in Fig. 5, these injectors work according to displacement of fluid principle.These embodiments are preferred in free-jetting dispensing applications.Each illustrating in these embodiments sucks and spray regime, and these states are significant conditions of displacement of fluid principle.
Fig. 5, A illustrate the basic functional principle of the pneumatic fluid displacer for generation of Fluid injection.Be p at pressure
f1described fluid intake 7 can obtain fluid, this pressure is environmental pressure p
urank.At sucting stage, controlled pressure p
cbe less than the pressure p fl of fluid.When desirable elastic diaphragm 8, controlled pressure is passed to the fluid being arranged in injector chambers 17 losslessly, thus such as ball valve 13 is opened, and makes fluid enter described injector chambers, and the ball of ball valve 13 is kept in position by valve spring 14.By controlled pressure is converted to p
c>p
fI, described inlet valve 15 changes closure state into, and described fluid issuing valve is opened, displacement fluids.Export and fluid disengaging completely to obtain fluid completely, the quick swing of controlled pressure is between the two states necessary, and this is in the present invention by using micro-electro-pneumatic loop to realize.
According to the present invention by controlled pressure p
chighly of short duration pressure pulse realizes the discharge (Fig. 5, B) of fluid.This pressure is transmitted by described barrier film 8, to apply pressure to the fluid in described injector chambers 17.Then by fluid through the injection of described fluid issuing 6 and enter described fluid supply 7 fluid backflow come releasing fluid pressure.After the pressure pulse of controlled pressure, controlled pressure is dropped rapidly to its lower stress level, and best situation is that this lower pressure levels is lower than fluid pressure p
fI(embodiment in Fig. 5, B).Along with the pressure in injector chambers is brought down below pFI, fluid enters injector chambers 17 by described inlet opens.Low pressure in injector chambers 17 acts on described fluid issuing simultaneously.The capillary force that fluid meniscus in the hole of described fluid issuing produces makes to set up vacuum in described injector chambers, and prevents from sucking air in this stage by described fluid issuing.In flexible pipe, the less capillary force of capillary diameter is larger.They are with the increase of diameter, and reduce in quadratic power, therefore ink jet principle is only in high-resolution digital printing, in the alcove of the printing for low viscosity fluid, uses minimum fluid issuing 6 (nozzle).
Fig. 4, C illustrate an embodiment, and employ harder barrier film 8, this barrier film has higher restoring force than barrier film used in Fig. 5, B.In this case, the restoring force of described barrier film 8 is mainly used at sucting stage, is absorbed in the fluid in described injector chambers 17.Therefore lower controlled pressure level needs not be Fig. 5, the low pressure in B in embodiment.
Injector of the present invention, according to the work of displacement of fluid principle, advantageously can be driven by the operator scheme 1 of the micro-electro-pneumatic loop structure in Fig. 3, A.Use this structure, due to opening fast of normally closed piezo electric valve, as the result of electric control signal, can realize the quick change at microsecond range controlled pressure, this is conducive to fluid drainage.At sucting stage, wish that the pressure in described injector chambers 17 slowly reduces, thus ensureing that the capillary pressure of the ratio fluid issuing that pressure can not decline is low, result, air is inhaled into described injector chambers through described fluid issuing 6 and instead of fluid through described fluid supply 7 suction injector chambers.By being become by described micro-electro-pneumatic loop design the time constant for reducing controlled pressure to be greater than time constant for improving controlled pressure, the slow reduction of described injector cavity pressure can be realized.This is by selecting R
k>R
vdesign described capillary 23 thus micro-electro-pneumatic loop in design drawing 3 pattern 1 realizes.
Fig. 5, D outline Fig. 5, and two further favourable improvement of B, can realize respectively.First, described barrier film 8 has two and is just coordinating retainer (positive-fitting stops), thus is limited the volume of the fluid of discharging from described injector chambers accurately by geometry.The second, when described barrier film 8 starts to contact with the lower surface close to described fluid issuing 6, can force and depart from suddenly at the fluid of described fluid issuing.
As shown in Figure 6, more than one injector 4 can primarily of the controlled pressure p with single path
cdrive, therefore, each path can comprise more than one injector (Fig. 6, A).If comprise two injectors, then these two injectors all can process identical fluid or different fluids or fluid and gas, respectively discharge or internal mix or external mix.
And the independent path controlled of several electricity can control an injector separately, and the output of these injectors can be combined as a whole, for generation of mixing.
Printhead of the present invention such as can comprise the first injector controlling fluid, control the second injector of atomizing air, described injector is driven jointly by the controlled pressure of single path, or driven respectively by the controlled pressure of two paths, the fluid issuing of described first and second injectors is combined as a whole, thus by air by described fluid atomizing.Described fluid issuing can be integrated in printhead (not shown) internal junction, or carries out the atomization of described fluid in the outside of printhead, the embodiment as shown in Fig. 6, B.The controlled pressure of single path feeds in the chamber on described membrane layer top, the example as shown in the left side of Fig. 6, B.At eDrive state (low p
c), described fluid valve and atomization air valve are opened, thus atomizing air and fluid are discharged by its corresponding fluid issuing.Described fluid issuing 6 for atomizing air can be installed as the such as concentric nozzle ring 6 around described fluid issuing 6, thus the generation fluid atomizing in described printhead outside.In the simplest situations, also atomization is realized by the crosswise jet of the fluid in described printhead outside and air.In principle, fluid atomizing needs the pipeline for atomizing air, is to make the inside of fluid or exterior atomization become possibility by atomizing air by these pipe design.In simple modification, control atomizing air continuously or off and on from outside.
When only using single path, by specifically selecting described controlled pressure p
cinlet point, and effectively make good use of time delay, time conversion, particularly overlapping time can be obtained and control, described by Fig. 6, B.As use Fig. 3, B, during micro-electro-pneumatic loop shown in operator scheme 1, this structure makes atomizing air before fluid drainage or simple flow always after discharge, thus avoids the Fluid injection not have atomization.
Fluid ejector also can comprise more than one fluid issuing (Fig. 6, C and D).This means that more than one nozzle (fluid issuing 6) is for each digital address path, the layer thickness on more uniform fluid distribution or surface can have been obtained like this, or complete further task.Such as, several fluid issuing 6 can adjacent or mutual front and back, being arranged in staggered rows of diagonal angle or any regular mutually.The staggered rows of at least two fluid issuings 6 is favourable arrangements.Described by Fig. 6, D, number is that the fluid issuing 6 of i, i>1 distributes to an addressable path n of numeral.
Fig. 7, A illustrate the preferred embodiment of printhead, and wherein said miniature valve 18 is configured to normally to open, and is connected to two stress level p
1and p
2in higher that, wherein said fluid ejector is pneumatic diaphragm valve.This embodiment is Fig. 3, B, the combination of the micro-electro-pneumatic loop 2 shown in operator scheme 1 and the fluid ejector shown in Fig. 4, A 4.When favourable size, stress level p
1, such as, be set as 2-5bar, the stress level p of the second port of pneumatic throttle 23
2be set as environmental pressure, the stress level of fluid remains on 0.80x p
1.Said structure and pressure setting ensure that described fluid pressure is always lower than p
1even if barrier film is revealed like this, do not have fluid permeability yet and enter electrical sensing zone to described pneumatic valve chamber.
In this embodiment, micro-electro-pneumatic loop 2 of described apparatus and method the application of the invention of the present invention makes valve stroke be that to be extended to the stroke being positioned at fluid ejector 4 be the diaphragm valve of 0.2mm to 0.5mm for the piezo electric valve of about 0.05mm, if such as use the elastomeric septum valve 8 that thickness is 0.05mm.By using elastomeric septum, also can process high particulate load fluid, particle size range is 1/10th millimeters.On the one hand, the deflection of described elastomeric septum a few tenths of a mm allows passing through of particle in the on-state, and on the other hand, at the closure state of described valve, the elasticity of the height of described barrier film also produces effective sealing, because particle has been bottled up by described elastic diaphragm.Due to the elasticity of the height of described elastomeric septum, the contact of described barrier film and abrasive grain only produces low internal stress, and it can not damage described barrier film.Described barrier film " surrender ", thus elastomeric septum is preferred in other barrier film, particularly when there is abrasive grain.
Use said structure, the time of opening described valve is 0.05ms to 0.2ms, the time <0.05ms of closed described fluid valve.Only have and could obtain these short conversion time by the microminiaturized pattern in described micro-electro-pneumatic loop, and ensure that discharge frequency is the Fluid injection completely of kHz scope, described fluid is have high viscosity and/or particles filled fluid.
Fig. 7, B illustrate the embodiment of printhead, and its free-jetting being specially adapted to fluid prints.Described printhead comprises miniature valve 18, is configured to normally closed miniature valve, and this miniature valve is connected to two stress level p
1and p
2in higher.Described fluid ejector 4 is barrier film displacement of fluid types.Described embodiment combines Fig. 3, micro-electro-pneumatic loop 2 of A operator scheme 1 and the fluid ejector shown in Fig. 5, C, and described fluid ejector is configured with harder barrier film 8, such as, be 0.1mm with the thickness that PEEK makes.Can use and printhead described in the element operation of the same size in micro-electro-pneumatic loop of such as Fig. 7, A.Because the aerodynamic drag of described pneumatic throttle 23 is larger than the aerodynamic drag of the miniature valve 18 opened, so after Fluid injection, the time constant of the earth pressure release of described controlled pressure is large equally, that is, controlled pressure usually slowly reduces.Wish this behavior occurs at fluid sucting stage.On the other hand, the flow resistance of the miniature valve 18 opened and the volume of described pneumatic node 5 very little, after the electric drive of miniature valve 18, because pressure pulse can produce effective Fluid injection fast.
As the shortcoming of this structure, due to the increase of described fluid issuing diameter and the reduction of the capillary force of described fluid issuing thereupon, need to consider that longer filling time and lower operating frequency are to prevent injector chambers described in air intake.
Fig. 8 illustrates the sectional view of embodiment through metering pathway of the printhead be made up of several checker plate.It is based on Fig. 3, B and Fig. 4, the structure shown in A.Tens of or hundreds of similar paths are arranged in a row perpendicular to sketch plane.
According to the present invention, described checker plate can be made up of metal, organic material or inorganic material respectively.Therefore be that to make intimate element of several or whole path be the part of common structure be favourable by described Design of Mechanical Structure.Thus, valve seat and the valve opening of the such as Pneumatic microvalve 18 of the some or all of paths of described printhead 1 are contained in checker plate PP2, see Fig. 8, and/or capillary in micro-electro-pneumatic loop of several or whole paths of described printhead 1 and/or pneumatic throttle 2 are contained in checker plate PP3, and/or the parts of the monotype piezoelectric actuator 21 of miniature valve 18 in several or whole paths of described printhead 1 are contained in checker plate, and/or the like of the fluid supply of several or whole paths of valve seat and/or described printhead is contained in common checker plate PF1, and/or the fluid issuing of several or whole paths of described fluid issuing and/or described printhead is contained in checker plate PF2.The barrier film of several or whole path also can be a part for complete diaphragm element.
Due to the high request of the dimensional accuracy of the element in described micro-electro-pneumatic loop, the valve opening of such as capillary or described miniature valve, and the high request of the dimensional accuracy of described fluid ejector element, such as described fluid issuing, valve seat and valve opening, the present invention advise using micro mechanical technology to manufacture in described checker plate at least one.Learn that micro mechanical technology comprises whole manufacturing technologies and technique from microsystems technology (MEMS) and micro-structural engineering.Such as can utilize photoetching technique and etching technique (subtractive process), or on the piconet card of single or double, realize pneumatic capillary, fluid passage, fluid issuing and valve seat by the layer (additional process) that increase is also photoetching reticulate pattern.In addition, micro mechanical technology comprises micro injection molding or other clone method.
According to the present invention, these checker plates or piconet card are combined by bonding, welding, melting welding or laminating.
As the manufacturing technology of cheapness, suggestion uses multilayer technique to manufacture described printhead or its parts.Multilayer technique is at first for the production of the technology of multilayer board (PCB).Some layers are used for electronic device, such as bondplys, and etched metallic plate (0.05mm-0.5mm is thick) replaces, and it is equivalent to such as above-mentioned checker plate or piconet card.Therefore, use laminating these to be hardened conjunction, just as the adhesive sheet (plate is bonding, pre-preg) using pre-cut pre-preg in circuit board making, such as, based on the adhesive sheet of epoxy resin or acrylate.
In order to operate, clean and maintenance, it is favourable for being bonded into attaching parts by the checker plate some organized and being made it combine.According to the present invention, such as, described checker plate is combined into a unit, and described checker plate comprises the element in micro-electro-pneumatic loop of several or whole path.This can be called Pneumatic component 24.In the embodiment shown in fig. 8, described Pneumatic component comprises plate PP1 and PP2, PP3 and PP4.Described Pneumatic component 24 advantageously comprises and only bears very little wearing and tearing or do not wear and tear, and/or it manufactures expensive element and structure.
According to the present invention, it is favourable that the fluid conveying part of described printhead is combined into fluidic component 25, and described fluidic component 25 is made up of checker plate (being plate PF1 and PF2 in fig. 8) and selectable barrier film 8.The plate of described fluidic component, element and structure are subject to wearing and tearing and the pollution of fluid.Therefore, it is significant for manufacturing described fluidic component cheaply and make it replaceable.According to the present invention, it is favourable further that the fluid conveying part of described printhead is combined into fluidic component 25, replaceable by dismountable connection fluidic component.Due to the material of use and the structural design of described fluidic component, the fluid of wide region or the requirement of print out task or allocating task can be applicable to.In order to print high viscosity, chemical corrosivity fluid, such as, fluorinated polymer material can be used.The diameter of described fluid issuing can be used for the drop size needed for acquisition.If when printing abrasive such as has the coating of pigment powder and filler, described fluidic component 25 is designed to disposable unit by the present invention's suggestion, its element is manufactured by injection-moulding plastic, and by laminating, bonding or thermal joining process, particularly ultrasonic bond, Laser Welding, melting welding or impulse welding, described combination of elements is got up.
Implement most preferred embodiment of the present invention
In Fig. 8, A, illustrate Pneumatic component 24, its lid PP1 comprises electronic circuit board, and this electronic circuit board has control electronic device 26, for driving the piezoelectric actuator of the miniature valve of several or whole path.By directly contacting with described micro-electric device 19 with the spring of described circuit board contacts, realize the contact with described piezoelectric element.The contact of described spring also provides power F, to be depressed on described valve seat by described valve actuator, thus makes miniature valve 8 remain on normally closed position.
Fig. 8, B1 illustrate the embodiment of fluidic component 25, and described fluidic component 25 comprises plate PF1 and PF2, and each path has a fluid ejector 4, and described fluid ejector 4 utilizes valve principle, and each fluid ejector 4 has multiple fluid issuing 6.Described first fluid plate comprises the parts of fluid providing structure 7 and the valve opening 9 of circular port parts, valve seat 10 and corresponding fluid valve.Described second fluid plate comprise described fluid providing structure 7 with the part of each path complementation, and the fluid issuing in bottom.If wish to obtain thicker distribution at each addressable pixel place, use shown each injector 4 to have the structure of more than one fluid issuing 6, larger path distance, thus lower print resolution is favourable.The described fluidic component 25 of Fig. 8, B1 be applicable to independent, crosses over aisled membrane layer 8 and described Pneumatic component 24 combined by alignment pin (not shown), between the clamp being then pressed into clamping device together.
Fig. 8, B2 illustrate the fluidic component 25 of side injection structure.Described membrane layer is through being welded and fixed to described fluidic component 25, thus the fluid leakage avoided when changing described parts and pollution.Or, barrier film 8, or other barrier film 8 can be fixed to described Pneumatic component, enters described Pneumatic component 24 to avoid dust or Liquid Penetrant.
Described fluidic component 25 is pressed on the checker plate of the described Pneumatic component 24 comprising n described controlled pressure port by hold down gag by the present invention's suggestion, thus the n of described Pneumatic component controlled pressure opening is connected with the driver diaphragm 8 of described each respective injectors is pneumatic.Pneumatic component 24, parts 25 and fluid diaphragm 8 are by the hold down gag of screw accessory, Press fitting form, and fastener or clamp are pressed together.Conventional barrier film 8, due to the advantage of its elastic performance, also can be further used for the sealing between fluid and Pneumatic component 24, parts 25, be used in particular for face seal.
According to the present invention, membrane layer can be connected to described fluidic component, such as, described barrier film 8 is soldered to described fluidic component 25, and as Suo Shi Fig. 8, C (example that side sprays), described fluidic component 25 comprises the barrier film of several path.Therefore, described printhead only comprises two modular constructions, and compared with three modular constructions, two modular constructions have the advantage of the replacing that processes described fluidic component faster and the inner sealing between fluidic component 25 and barrier film 8.But same, described membrane layer 8 or the second membrane layer can be connected with described Pneumatic component securely.
According to the present invention, such as described Pneumatic component 24 is fixed to printing or metering device by screw accessory.Described printing or metering device can comprise the clamp or quick locking accessory that can insert barrier film 8 and fluidic component 25, work as complete matching, are pressed to the bottom of described Pneumatic component 24.
When changing different fluid, when change different configurations, defectiveness or wearing and tearing barrier film time, when changing other configuration, fluidic component 25 that is dirty or that pollute, such modular design provides maximum flexibility.
About multi-color printing (such as, 4 looks, 5 looks, 6 looks), invention proposes a kind of device, wherein printhead comprises the flat sheet mould 34 of multiple arrayed, each flat sheet mould makes thin, reticulate pattern formula, parallel-plate, each flat board comprises the feature in fluid ejector and micro-electro-pneumatic loop, sees Fig. 9, and described piconet card is preferably the metallic plate using etching technique to make.In order to be combined by described metallic plate, the present invention advises using checker plate adhesive and laminating technology.Module 34 comprises described micro-electro-pneumatic loop of lateral arrangement and is configured to the described fluid ejector of such as side injection and one or more pigment.According to the present invention, perpendicular to running through the described plate supply of whole width of described printhead for the pigment supply line of different colours and pneumatic supply line.In order to the independent module of replacing that can be easy, module stack (module-stack) is preferably pressed between two described margin plates 35 removably.As proposed in Figure 9, each module can comprise independent Electronic Control, and when 4 look printhead, 4 path microchips are very suitable.The fluid issuing of often kind of color path can be arranged in parallel, is spaced from each other a distance, and they also can guide to common fluid issuing in inside jointly, thus realize internal mix.Finally, as shown in Fig. 6, B, in addition also can by the atomization of the pigment of discharge.Air by being atomized continuously realizes atomization, or the extra path also by controlling described atomizing air realizes atomization discontinuously.
Claims (17)
1. printhead, this printhead has multi-path, and the feature of a path is to comprise:
Micro-electro-pneumatic loop (2), comprises the series loop be between the first stress level and the second stress level, this series loop by:
First miniature valve (18), and
Pneumatic throttle (23) or the second miniature valve
Composition,
Common pneumatic node (5) place that described micro-electro-pneumatic loop is used between the first miniature valve (18) and pneumatic throttle (23) or the second miniature valve produces controlled pressure p
c,
The fluid ejector (4) of at least one drop-on-demand, it has by described controlled pressure p
cthe air impeller driven, described fluid ejector (4) controls the fluid drainage by least one fluid issuing (6).
2. printhead according to claim 1, it is characterized in that, the chamber be associated with described pneumatic node (5), the pneumatic end of fluid ejector and the swept volume of described fluid ejector have miniaturization structure, with realize in the scope of 1 microsecond to 1 millisecond for described controlled pressure p
cthe time constant that state changes.
3. printhead according to claim 1, is characterized in that, the fluid ejector (4) of described drop-on-demand is by utilizing barrier film (8) as air impeller according to the work of valve principle, and the first surface of described barrier film (8) is by controlled pressure p
cdrive, and its second common as fluid valve with valve seat (10) and valve opening (9), the control of this fluid valve is exported by the fluid of fluid issuing (6).
4. printhead according to claim 1, is characterized in that, the fluid ejector (4) of described drop-on-demand according to displacement principle work, as controlled pressure p
cwhen making described air impeller deflection, described air impeller makes the fluid expulsion contained in injector chambers (17), thus sprays fluid by fluid issuing (6).
5. printhead according to claim 1, is characterized in that, described air impeller comprises barrier film (8), and described barrier film (8) comprises elastomer.
6. printhead according to claim 1, is characterized in that, at least described first miniature valve (18) is piezo electric valve.
7. printhead according to claim 1, is characterized in that, at least described first miniature valve (18) is for having the piezo electric valve of piezoelectric bending transducer.
8. printhead according to claim 1, is characterized in that, comprises Pneumatic component (24), and this Pneumatic component comprises micro-electro-pneumatic loop (2) of multiple path.
9. printhead according to claim 8, is characterized in that, comprise fluidic component (25), this fluidic component comprises the fluid control component of multiple path.
10. printhead according to claim 9, is characterized in that, is dismountable connection between described Pneumatic component (24) and described fluidic component (25).
11. printheads according to claim 1 or 3, it is characterized in that, described first miniature valve (18) is configured to normally closed, and is connected to lower that in described two stress levels, and described pneumatic throttle (23) is connected to higher that in described two stress levels.
12. printheads according to claim 1 or 3, it is characterized in that, described first miniature valve (18) is configured to normally to open, and being connected to higher that in described two stress levels, described pneumatic throttle (23) or the second miniature valve are connected to lower that in described two stress levels.
13. printheads according to claim 1 or 4, it is characterized in that, described first miniature valve (18) is configured to normally closed, and being connected to higher that in described two stress levels, described pneumatic throttle (23) or the second miniature valve are connected to lower that in described two stress levels.
14. printheads according to claim 1, it is characterized in that, comprise the first injector (4) and the second injector (4), described first injector discharge liquid, described second injector controls the atomizing air of pressurization, and the fluid issuing (6) of described first and second injectors is set to make described liquid by described air atomizing.
15. by the method for printhead prints fluid with multi-path, wherein in a path:
By micro-electro-pneumatic loop (2) electric control signal changed into the pneumatic control pressure p on the common pneumatic node (5) be positioned between the first miniature valve (18) and pneumatic throttle (23) or the second miniature valve
c, described micro-electro-pneumatic loop comprises series loop between the first and second stress levels, that be made up of with pneumatic throttle (23) or the second miniature valve the first miniature valve (18),
Described controlled pressure p
cfor driving the air impeller of the fluid ejector (4) of at least one drop-on-demand, described air impeller controls the fluid drainage by least one fluid issuing (6).
16. manufacture methods with the printhead of multi-path according to claim 1, is characterized in that, by the manufacture method in microsystems technology field, the valve seat (10) obtaining each miniature valve (18) of multi-path with common plate and valve opening.
17. manufacture methods with the printhead of multi-path according to claim 1, is characterized in that, by the manufacture method in microsystems technology field, the pneumatic throttle (23) obtaining multi-path with common plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009029946A DE102009029946A1 (en) | 2009-06-19 | 2009-06-19 | Print head or dosing head |
| DE102009029946.7 | 2009-06-19 | ||
| PCT/IB2010/002015 WO2010146473A1 (en) | 2009-06-19 | 2010-06-21 | Multichannel - printhead or dosing head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102574395A CN102574395A (en) | 2012-07-11 |
| CN102574395B true CN102574395B (en) | 2015-03-11 |
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|---|---|---|---|
| CN201080036422.4A Active CN102574395B (en) | 2009-06-19 | 2010-06-21 | Multichannel - printhead or dosing head |
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| EP (1) | EP2442983B1 (en) |
| CN (1) | CN102574395B (en) |
| DE (1) | DE102009029946A1 (en) |
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| WO (1) | WO2010146473A1 (en) |
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- 2010-06-21 EP EP10752172.6A patent/EP2442983B1/en active Active
- 2010-06-21 ES ES10752172.6T patent/ES2537542T3/en active Active
- 2010-06-21 WO PCT/IB2010/002015 patent/WO2010146473A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2010146473A1 (en) | 2010-12-23 |
| EP2442983A1 (en) | 2012-04-25 |
| EP2442983B1 (en) | 2015-02-25 |
| DE102009029946A1 (en) | 2010-12-30 |
| CN102574395A (en) | 2012-07-11 |
| ES2537542T3 (en) | 2015-06-09 |
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