WO2021260751A1 - Procédé de commande d'entraînement d'une tête à jet d'encre et appareil d'impression à jet d'encre - Google Patents

Procédé de commande d'entraînement d'une tête à jet d'encre et appareil d'impression à jet d'encre Download PDF

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Publication number
WO2021260751A1
WO2021260751A1 PCT/JP2020/024306 JP2020024306W WO2021260751A1 WO 2021260751 A1 WO2021260751 A1 WO 2021260751A1 JP 2020024306 W JP2020024306 W JP 2020024306W WO 2021260751 A1 WO2021260751 A1 WO 2021260751A1
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WIPO (PCT)
Prior art keywords
ink
nozzle
drive
flow path
inkjet head
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PCT/JP2020/024306
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English (en)
Japanese (ja)
Inventor
靖彦 末冨
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コニカミノルタ株式会社
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Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to PCT/JP2020/024306 priority Critical patent/WO2021260751A1/fr
Priority to JP2022531244A priority patent/JPWO2021260751A1/ja
Publication of WO2021260751A1 publication Critical patent/WO2021260751A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems

Definitions

  • the present invention relates to an inkjet head drive control method and an inkjet recording device.
  • inkjet recording device that ejects ink from a nozzle to record images, etc., if ink that is not ejected stays near the nozzle, it deviates from the appropriate ink ejection conditions due to separation of components and evaporation of water from the nozzle opening. However, there are problems that the desired image quality cannot be obtained and that the ink ejection is defective.
  • the meniscus is brought closer to the circulation flow path, the meniscus is likely to be disturbed due to the influence of the ink flow, and there is a problem that the ink may not be ejected normally at the next ejection.
  • An object of the present invention is to provide a drive control method for an inkjet head and an inkjet recording device capable of ejecting ink more stably.
  • the invention according to claim 1 is A nozzle for ejecting ink, a supply flow path for supplying ink to the nozzle, an discharge flow path for discharging ink in the supply flow path, and an ink in the supply flow path according to an applied drive signal.
  • a drive control method for an inkjet head including a drive element that performs an operation that causes pressure fluctuations.
  • a non-ejection drive step for performing a non-ejection drive in which the drive signal that does not eject ink from the nozzle is applied to the drive element is included.
  • the average liquid of the ink in the nozzle after the drive signal is applied rather than the average liquid level position of the ink in the nozzle before the drive signal is applied.
  • the surface position is farther from the opening surface of the nozzle.
  • the invention according to claim 2 is the method for driving and controlling an inkjet head according to claim 1.
  • the signal waveform of the drive signal related to the non-discharge drive is It includes a rising part of the voltage, a part maintained by the voltage after the rising edge, and a falling part returning from the voltage after the rising edge to the first voltage.
  • the pressure of the ink is lowered by the rise of the voltage, and the pressure is lowered.
  • the fall time is longer than the rise time.
  • the invention according to claim 3 is the method for driving and controlling an inkjet head according to claim 2.
  • the falling time is 0.3 times or more longer than the rising time of the resonance period related to the pressure vibration of the ink in the nozzle.
  • the invention according to claim 4 is the method for driving and controlling an inkjet head according to claim 3.
  • the falling time is 0.35 times or more longer than the rising time, and the rising time is 0.2 times or less the resonance cycle.
  • the invention according to claim 5 is the method for driving and controlling an inkjet head according to any one of claims 1 to 4.
  • the inkjet head ejects ceramic ink or white ink.
  • the invention according to claim 6 is the method for driving and controlling an inkjet head according to any one of claims 1 to 5.
  • the non-ejection drive step is performed at a recording cycle of each pixel that does not eject ink when recording an image.
  • a nozzle for ejecting ink a supply flow path for supplying ink to the nozzle, an discharge flow path for discharging ink in the supply flow path, and an ink in the supply flow path according to an applied drive signal.
  • An inkjet head including a drive element that performs an operation that causes pressure fluctuations, Control unit and Equipped with The control unit performs a non-ejection drive in which the drive signal that does not eject ink from the nozzle is applied to the drive element.
  • the average liquid of the ink in the nozzle after the drive signal is applied rather than the average liquid level position of the ink in the nozzle before the drive signal is applied.
  • This is an inkjet recording device whose surface position is farther from the opening surface of the nozzle.
  • the ink jet head can eject ink more stably.
  • FIG. 1 is a block diagram showing a functional configuration of the inkjet recording device 1 of the present embodiment.
  • the inkjet recording device 1 includes a control unit 40, a transport drive unit 41, a recording operation unit 42, a storage unit 44, a communication unit 51, a display unit 52, an operation reception unit 53, a liquid feed pump 54, and the like. , It is configured to be connected to the bus 49 so that signals can be transmitted and received to each other.
  • the control unit 40 includes a CPU 401 (Central Processing Unit), a ROM 402 (Read Only Memory), a RAM 403 (Random Access Memory), and the like.
  • the CPU 401 performs various arithmetic processes.
  • the CPU 401 receives a measurement signal and a status signal from each unit, and transmits a control signal for causing each unit to perform an appropriate operation.
  • the ROM 402 stores setting data, programs, and the like.
  • the RAM 403 provides a working memory space to the CPU 401 and stores temporary data.
  • the temporary data may include image data to be recorded, setting data thereof, and processing data.
  • the transport drive unit 41 operates a transport unit that transports and moves a recording medium on which an image to be recorded is recorded based on a control signal from the control unit 40.
  • the transport unit has, for example, an endless belt or a rotary drum on which a recording medium is placed, and the transport drive unit 41 orbits the endless belt or rotates the rotary drum at a predetermined speed. ..
  • the transport drive unit 41 has, for example, a rotary motor or the like.
  • the recording operation unit 42 performs an operation of ejecting ink to a recording medium to record an image.
  • the recording operation unit 42 has an inkjet head 420.
  • the inkjet head 420 includes a nozzle N, a piezoelectric element 421 (driving element), a head driving unit 422, and the like.
  • the nozzle N ejects ink.
  • the piezoelectric element 421 is located along the ink supply path communicating with the nozzle N, and deforms when a driving voltage is applied.
  • the piezoelectric element 421 causes pressure fluctuation in the ink in the ink supply path according to the drive signal by the deformation operation according to the drive signal indicating the change pattern of the drive voltage.
  • the head drive unit 422 outputs a drive signal to the selected piezoelectric element 421.
  • the recording operation unit 42 may have a plurality of inkjet heads 420.
  • the type of ink to be ejected is not particularly limited, but is, for example, ceramic ink. Further, the ink may contain white ink. Many of these inks are easier to separate components than other inks.
  • the drive waveform signal generation unit 43 generates a drive waveform signal included in the drive signal output by the head drive unit 422.
  • the drive waveform signal is not particularly limited, but the digital signal data indicating each of a plurality of types of drive waveforms is analog-converted, and the drive waveform signal amplified with voltage and current is output to the head drive unit 422.
  • the head drive unit 422 selects one of a plurality of drive waveform signals, combines a plurality of the drive waveform signals according to the need and the drive method, and outputs the signals to each piezoelectric element 421 at an appropriate timing.
  • the control unit 40 outputs control signals to the transport drive unit 41 and the head drive unit 422 and operates them at appropriate timings so that the recording medium faces the openings of the plurality of nozzles N of the inkjet head 420 under appropriate conditions. Also, the ejected ink is landed at an appropriate position on the recording medium.
  • the specific discharge timing may be synchronized with a clock signal input from an oscillation circuit (not shown) or the like.
  • the drive control signal specifies the presence / absence of ink ejection from each nozzle N in each ink ejection cycle and the ejection amount as necessary.
  • the ink ejection cycle may be synchronized with the ink landing cycle (recording cycle) on each pixel, or a plurality of ink ejection cycles may be set within the recording cycle. For example, an ejection signal or a non-ejection signal is output at least once in the recording cycle of each pixel depending on whether or not ink is ejected to the pixel, and when the ejection amount is large, the ejection signal is output twice or more. You may.
  • the storage unit 44 stores various data.
  • the various data include image data acquired from the outside as a print job, its processing data, various setting data related to the image recording operation, and the like.
  • the various setting data may include update data such as initial setting data and programs stored in the ROM 402.
  • the communication unit 51 controls communication between the inkjet recording device 1 and an external device.
  • the print job and various control signals transmitted from the external device are received via the communication unit 51 and sent to the control unit 40.
  • the control unit 40 performs various processes for image recording operation according to the acquired print job. It should be noted that processing such as image data analysis and rasterization may be performed by providing a CPU and memory for image processing separately from the control unit 40.
  • the display unit 52 performs various displays on the display screen based on the control signal input from the control unit 40.
  • the display unit 52 may have, for example, a liquid crystal display screen and can display characters and images such as menus and statuses. Further, the display unit 52 may also have an LED lamp or the like.
  • the operation reception unit 53 has, for example, a touch panel located overlapping the liquid crystal screen of the display unit 52, receives an input operation from the outside such as a user, and outputs the input signal to the control unit 40.
  • the control unit 40 outputs a display control signal to display a status, a menu, or the like on the liquid crystal screen.
  • the operation receiving unit 53 may also have a numeric keypad, a push button switch, and / or a rocker switch.
  • the liquid feed pump 54 performs a liquid feed operation of feeding ink from an ink tank (not shown) to the inkjet head 420.
  • ink equal to or larger than the amount of ink ejected from the nozzle N is supplied, and the ink not ejected is returned from the inkjet head 420 to the ink tank.
  • FIG. 2 is a cross-sectional view illustrating the ink flow path structure in the vicinity of the nozzle N of the inkjet head 420.
  • This cross section includes one nozzle N.
  • a plurality of nozzles N of the inkjet head 420 are arranged at least in a direction perpendicular to this cross section.
  • the nozzle substrate 110 In the inkjet head 420, the nozzle substrate 110, the flow path substrate 120, the pressure chamber substrate 130, and the like are laminated.
  • the nozzle substrate 110 is provided with a nozzle N.
  • the flow path substrate 120 has an ink flow path 121 communicating with the nozzle N and individual recovery flow paths 122 and 123 (discharge flow paths).
  • the individual recovery flow paths 122 and 123 are branched from the ink flow path 121 in opposite directions at the bottom of the flow path substrate 120, respectively.
  • the pressure chamber substrate 130 has an ink supply path 131, a common recovery flow path 132, 133, an air chamber 134, and the like.
  • the ink supply path 131 communicates with the ink flow path 121, and together with the ink flow path 121, constitutes an individual supply flow path (supply flow path) for ink to each nozzle N.
  • the common recovery flow paths 132 and 133 extend in a direction perpendicular to the cross section of FIG. 2, and the inks flowing out from the individual recovery flow paths 122 and 123 related to the plurality of nozzles N merge and flow, and the inkjet head 420 Is sent to the outside of. That is, in this inkjet head 420, the ink flows through the individual supply flow path to directly above the nozzle N, a part of the ink is discharged from the nozzle N, and the rest is commonly collected from the individual supply flow path through the individual recovery flow paths 122 and 123. It is discharged to the flow paths 132 and 133. The discharged ink may be returned to the ink tank and sent to the inkjet head 420 again.
  • the individual supply channels and the individual collection channels 122 and 123 form part of the ink circulation channels.
  • the pressure chamber substrate 130 is mainly composed of a piezoelectric member. Further, an electrode film (not shown) is provided on the wall surface of the piezoelectric member along the ink supply path 131, and the wall surface is formed by applying a predetermined drive voltage via the wiring connected to the electrode film. transform. In response to this deformation, pressure fluctuation (vibration) occurs in the ink inside the ink supply path 131.
  • the air chamber 134 is a space for allowing deformation of the piezoelectric member, and is for preventing the influence of deformation from each other with the ink supply path 131 related to the other nozzles N arranged in the direction along the cross section. It is also a space for.
  • 3A and 3B are diagrams showing an example of a drive signal output by the inkjet recording apparatus 1 of the present embodiment.
  • a voltage signal of a trapezoidal wave that returns (falls) to the original voltage after the drive voltage rises and is maintained is output.
  • the ejection signal that causes pressure vibration (fluctuation) for ejecting the ink to the ink, and the position of the liquid surface inside the nozzle N without ejecting the ink are changed (non-ejection). Includes non-discharge signals (which drive). As shown in FIG.
  • the discharge signal has a maintenance period Ta1 of the first drive voltage Va1 changed from the reference voltage Vs, and a rising period Tu1 and a standing period of voltages shorter than the maintenance period Ta1 and having the same length as each other. It has a trapezoidal wave shape including a falling period Td1.
  • the maintenance period Ta1 is about the acoustic resonance length (AL; Acoustic Length), which is half of the resonance cycle related to the vibration of the ink in the individual supply flow path, but is not limited to exactly 1AL and is appropriately adjusted. It's okay.
  • the piezoelectric member is deformed so that the individual supply flow path expands as the voltage rises, and the ink pressure drops, and the expansion of the individual supply flow path is eliminated as the voltage falls (shrinkage). Then) increase the pressure of the ink (pulling operation). That is, in the ejection signal, not only the movement of the ink liquid level (meniscus) in the nozzle N due to the static pressure change due to the sudden deformation of the individual supply flow path due to the rise and fall of the applied voltage, but also the ink. Vibration energy (kinetic energy) is generated.
  • the ink When the applied voltage drops in accordance with the phase in which the vibration generated by the rise of the applied voltage becomes outward (expansion), the ink further gains the outward momentum of the nozzle N, and the liquid level of the ink rises before the rise. Not only does it return to its original position, but it also protrudes from the nozzle opening, and a part of it separates from the ink in the nozzle N and is ejected.
  • the first drive voltage Va1 is the reference voltage Vs according to the direction of the shape change of the first drive voltage Va1 and the piezoelectric element 421. It may be smaller than (including the case of negative voltage). In either case, the change in which the applied voltage deviates from the reference voltage Vs is defined as the rising edge, and the change in which the applied voltage returns to the reference voltage Vs is defined as the falling edge.
  • the non-discharge signal is a voltage difference between the reference voltage Vs and the second drive voltage Va2, that is, the voltage amplitude is the voltage difference between the reference voltage Vs and the first drive voltage Va1 in the discharge signal ( Voltage amplitude) is smaller.
  • the fall time Td2 is longer than the rise time Tu2.
  • the maintenance time Ta2 is set to 1AL, which is the same as the maintenance time Ta1.
  • the rise time Tu2 is, for example, about 1 / 4AL like the rise time Tu1 of the discharge signal, and the fall time Td2 is about 1AL, which is the same as the maintenance time Ta2.
  • the ink in the individual supply flow path is depressurized by the rising time Tu2, which is shorter than that of AL, and the liquid level (meniscus) of the ink in the nozzle N is from the nozzle opening surface. It is drawn inward (back side) and obtains vibration energy due to sudden decompression.
  • the applied voltage is returned to the reference voltage Vs by applying a fall time Td2 that is significantly longer than the rise time Tu2, the pressure of the ink rises, but the vibration energy obtained by pressing from the wall surface is small.
  • the meniscus returns to the position before the rise of the applied voltage (original position; here, for example, the average liquid level position from the start of the ink ejection cycle to the start of the rise) at the same time as the end of the fall of the applied voltage.
  • Original position here, for example, the average liquid level position from the start of the ink ejection cycle to the start of the rise
  • the position of the meniscus (here, the average liquid level position at a predetermined time from the end of the fall) is deeper than the original position (position far from the nozzle opening surface).
  • This state is not the final equilibrium state, and then the meniscus slowly moves to the original position due to the capillary phenomenon in the narrow nozzle N or the like. This movement is sufficiently slower than the vibration cycle of the ink (vibration component of about AL / 2 determined by the shape of the individual supply flow path) generated according to the rise time Tu2.
  • FIG. 4A and 4B are the same cross-sectional views as those shown in FIG.
  • the position of the meniscus M is located closer to the opening side of the nozzle N. Therefore, the ink in the nozzle N is out of the circulation flow path of the ink indicated by the arrow, and stays while the state of not being ejected continues.
  • the ink pulled back from the nozzle N rides on the ink flow from the individual supply flow path to the individual recovery flow paths 122 and 123, and the individual recovery flow path 122 from the inlet of the nozzle N. It suffices to continue for the minimum necessary time to move to the side of 123.
  • the appropriate non-discharge signal makes it possible to appropriately control the meniscus position immediately after the non-discharge signal is applied.
  • the conditions for obtaining such a meniscus position are determined according to the magnitudes of the rise time Tu2, the maintenance time Ta2, and the fall time Td2, and their relationships.
  • the maintenance time Ta2 is fixed to 1AL will be described. Since the actually required pull-in length depends on the length of the nozzle N and the like, the voltage amplitude and the like according to the pull-in length may be appropriately adjusted.
  • FIG. 5 is a chart showing an example of the retreat state of the ink liquid level position according to the relationship between the rise time Tu2 and the fall time Td2.
  • the fall time Td2 is short, especially when it is 0.5AL or less, the liquid level (meniscus) does not recede after the non-discharge signal is applied ( ⁇ ). That is, vibration energy is applied to the ink at the time of falling, and the meniscus is not maintained at a position far from the nozzle opening, which is the equilibrium position of the meniscus according to the size of the individual supply flow path after falling. Further, even if the fall time Td2 is 0.7AL or more, if the rise time Tu2 becomes long, the meniscus is less likely to recede.
  • the rise time Tu2 is 0.5AL or more
  • the retreat occurs, but the retreat of the meniscus does not sufficiently fall to the vicinity of the boundary between the nozzle N and the ink flow path 121 due to the relationship with the fall time Td2. That is, when the rise time Tu2 is longer than the fall time Td2 to a certain extent or more, the vibration energy related to the pressure reduction of the ink cannot be sufficiently obtained, so that the force for pulling the ink into the nozzle N after applying the non-ejection signal. Will not remain enough.
  • at least the fall time Td2 is 0.6AL (0.3 times the resonance period) or more longer than the rise time Tu2, so that the meniscus can be pulled in ( ⁇ ).
  • the rise time Tu2 is 0.4AL or less (0.2 times or less of the resonance cycle) and the fall time Td is 1.1AL or more (that is, 0.7AL than the rise time Tu2 (0.35 times the resonance cycle)).
  • the ink in the nozzle N is sufficiently effectively discharged and circulated due to the retreat of the meniscus ( ⁇ ).
  • FIG. 6 is a graph showing the degree of the effect of the ink in the nozzle N on maintaining the normal ink ejection operation with respect to the ink circulation flow rate.
  • the ink flow velocity here is the velocity of the downward (nozzle N direction) flow above the nozzle N in the ink flow path 121 when the ink is not ejected.
  • the defects mainly include changes (decrease) in the ink ejection speed and the ejection amount, and may cause abnormalities in the ejection direction. If the ink flow rate is higher than a certain level as compared with the case where the ink flow rate is zero, the above-mentioned effect of suppressing ejection defects occurs, and the degree of this effect (progress of ejection defects) is the lower limit value (here, 3 mm / sec). It has been shown that a sufficient effect can be obtained at a flow velocity of about) or higher, regardless of the circulation speed.
  • the driving method of the inkjet head 420 of the present embodiment includes a nozzle N for ejecting ink, an ink flow path 121 and an ink supply path 131 which are individual supply channels for supplying ink to the nozzle N, and an ink supply path 131.
  • This is a drive control method for the inkjet head 420 provided.
  • This drive control method includes a non-ejection drive step in which the head drive unit 422 of the drive unit performs a non-ejection drive in which a drive signal that does not eject ink from the nozzle N is applied to the piezoelectric element 421.
  • a non-ejection drive step in which the head drive unit 422 of the drive unit performs a non-ejection drive in which a drive signal that does not eject ink from the nozzle N is applied to the piezoelectric element 421.
  • the ink in the nozzle N after the drive signal is applied rather than the average liquid level position of the ink in the nozzle N before the drive signal is applied in each recording cycle.
  • the average liquid level position of is farther from the opening surface of the nozzle.
  • the signal waveform of the drive signal related to the non-discharge drive includes a rising portion of the voltage, a portion maintained by the voltage after the rising edge, and a falling portion where the voltage after the rising edge returns to the initial voltage.
  • the pressure of the ink is lowered by the rising edge of the voltage, and the falling edge time is longer than the rising edge time. This reduces the supply of kinetic energy to the ink to return the meniscus to its original position compared to the pulling in of the meniscus, so it is possible to obtain an effective drive waveform for collecting and replacing the ink near the nozzle N. can.
  • the falling time Td2 is 0.3 times or more longer than the rising time Tu2 of the resonance period (2 ⁇ AL) related to the pressure vibration of the ink in the nozzle N.
  • the falling time Td2 is 0.7 times or more longer than the rising time Tu2, and the rising time Tu2 is 0.4 times or less the AL.
  • the inkjet head 420 ejects ceramic ink or white ink. Since these inks are easy to separate components and are prone to ejection abnormalities, as described above, by making the ink in the nozzle N easily and appropriately circulated without destroying the meniscus, it is more stable. Normal discharge can be continued.
  • the non-ejection drive step is performed in the recording cycle of each pixel that does not eject ink when recording an image. That is, the ink in the nozzle N is continuously replaced while the ink is not ejected, and the destruction of the meniscus is sufficiently reduced, so that the ejection frequency is low even during normal recording operation. Ink such as nozzle N can be kept in an appropriate state, and normal ink ejection can be performed immediately at a required timing.
  • the inkjet recording apparatus 1 of the present embodiment includes a nozzle N for ejecting ink, an ink flow path 121 and an ink supply path 131 as a supply flow path for supplying ink to the nozzle N, and ink in an individual supply flow path.
  • An inkjet head 420 including individual recovery channels 122 and 123 from which ink is discharged, and a piezoelectric element 421 that performs a deformation operation that causes pressure fluctuations in the ink in the individual supply channels according to an applied drive signal.
  • a control unit 40 (CPU 401) is provided.
  • the control unit 40 causes the head drive unit 422 to perform a non-ejection drive in which a drive signal that does not eject ink from the nozzle N is applied to the piezoelectric element 421.
  • the average liquid level position of the ink after the drive signal is applied is farther from the opening surface of the nozzle N than the average liquid level position of the ink in the nozzle N before the drive signal is applied in the ejection cycle.
  • the ink flowing out of the nozzle N is discharged, collected, and circulated by the circulating flow of ink, the ink flowing into the nozzle N can be used to keep the ink in the nozzle N in an appropriate state. ..
  • the possibility that the meniscus is easily disturbed or destroyed without requiring complicated control can be reduced.
  • the present invention is not limited to the above embodiment, and various modifications can be made.
  • the non-ejection drive is performed in all the recording cycles of each pixel, but it is not always necessary to retract the meniscus as described above in all the ink non-ejection recording cycles. ..
  • the meniscus may be retracted only at a predetermined frequency or cycle.
  • ceramic ink and white ink have been described as examples, but the present invention is not limited to these. Even with other types of ink, the ink in the nozzle N may be circulated in the same manner.
  • the drive waveform is described as being a trapezoidal waveform, but it is not strictly limited to this as long as it is a trapezoidal waveform close to this.
  • the rising / falling edges of the drive waveform do not have to be a perfect straight line, and may be accompanied by a slight curved change, or the slope may be slightly changed in the middle.
  • a well-known waveform that is smaller than the trapezoidal waveform related to the stabilization of the vibration of the meniscus may be added.
  • the specific configuration, the content and procedure of the processing operation shown in the above embodiment can be appropriately changed without departing from the spirit of the present invention.
  • the scope of the present invention includes the scope of the invention described in the claims and the equivalent scope thereof.
  • the present invention can be used for an inkjet head drive control method and an inkjet recording device.
  • Inkjet recording device 40 Control unit 401 CPU 402 ROM 403 RAM 41 Transport drive unit 42 Recording operation unit 420 Inkjet head 421 Piezoelectric element 422 Head drive unit 43 Drive waveform signal generation unit 44 Storage unit 49 Bus 51 Communication unit 52 Display unit 53 Operation reception unit 54 Liquid transfer pump 110 Nozzle board 120 Flow path board 121 Ink flow path 122, 123 Individual recovery flow path 130 Pressure chamber substrate 131 Ink supply passage 132, 133 Common recovery flow path 134 Air chamber M Meniscus N Nozzle

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Abstract

L'invention concerne un procédé de commande de l'entraînement d'une tête à jet d'encre et un appareil d'impression à jet d'encre, avec lequel de l'encre peut être évacuée de manière plus stable. L'invention concerne un procédé de commande de l'entraînement d'une tête à jet d'encre comprenant une buse qui décharge de l'encre, un canal d'écoulement d'alimentation qui fournit l'encre à la buse, un canal d'écoulement d'éjection à travers lequel l'encre dans le canal d'écoulement d'alimentation est éjectée et un élément d'entraînement qui réalise une action pour induire une fluctuation de pression dans l'encre à l'intérieur du canal d'écoulement d'alimentation en fonction d'un signal d'entraînement appliqué, le procédé comprenant une étape d'entraînement de non-évacuation pour effectuer un entraînement de non-évacuation dans lequel un signal d'entraînement qui ne provoque pas l'évacuation de l'encre de la buse est appliqué à l'élément d'entraînement ; et dans la forme d'onde de signal du signal d'entraînement relatif à l'entraînement de non-évacuation, la position de niveau d'encre moyenne dans la buse après que le signal d'entraînement a été appliqué est plus loin de la surface ouverte de la buse que la position de niveau d'encre dans la buse avant l'application du signal d'entraînement.
PCT/JP2020/024306 2020-06-22 2020-06-22 Procédé de commande d'entraînement d'une tête à jet d'encre et appareil d'impression à jet d'encre WO2021260751A1 (fr)

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PCT/JP2020/024306 WO2021260751A1 (fr) 2020-06-22 2020-06-22 Procédé de commande d'entraînement d'une tête à jet d'encre et appareil d'impression à jet d'encre
JP2022531244A JPWO2021260751A1 (fr) 2020-06-22 2020-06-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0952360A (ja) * 1995-04-21 1997-02-25 Seiko Epson Corp インクジェット式記録装置
JP2010194750A (ja) * 2009-02-23 2010-09-09 Fujifilm Corp インクジェットヘッド及びインクジェット記録方法
JP2012232575A (ja) * 2011-04-19 2012-11-29 Canon Inc 液体吐出ヘッド、および液体吐出ヘッドの駆動方法
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* Cited by examiner, † Cited by third party
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JPH0952360A (ja) * 1995-04-21 1997-02-25 Seiko Epson Corp インクジェット式記録装置
JP2010194750A (ja) * 2009-02-23 2010-09-09 Fujifilm Corp インクジェットヘッド及びインクジェット記録方法
JP2012232575A (ja) * 2011-04-19 2012-11-29 Canon Inc 液体吐出ヘッド、および液体吐出ヘッドの駆動方法
US20190224967A1 (en) * 2016-06-30 2019-07-25 Xaar Technology Limited Droplet deposition apparatus

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