WO2022102526A1 - 液体供給装置、液体供給装置の制御方法、印刷装置 - Google Patents
液体供給装置、液体供給装置の制御方法、印刷装置 Download PDFInfo
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- WO2022102526A1 WO2022102526A1 PCT/JP2021/040721 JP2021040721W WO2022102526A1 WO 2022102526 A1 WO2022102526 A1 WO 2022102526A1 JP 2021040721 W JP2021040721 W JP 2021040721W WO 2022102526 A1 WO2022102526 A1 WO 2022102526A1
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- liquid
- flow path
- flow
- ink
- valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17596—Ink pumps, ink valves
Definitions
- the present invention relates to a liquid supply device, a control method for the liquid supply device, and a printing device, and particularly relates to a technique for preventing sedimentation of liquid contents in a flow path.
- An inkjet recording device in which ink is circulated by a circulation flow path provided between an ink tank and a recording head in order to stabilize ink ejection to prevent foreign matter from being removed and pigment from settling.
- Patent Documents 1 and 2 describe techniques for changing the flow direction of ink by changing the rotation direction of the pump in the opposite direction.
- Patent Documents 1 and 2 are techniques for removing air bubbles in the circulation flow path, and cannot prevent the pigment in the ink from settling. Further, if the ink is flowed in the opposite direction without consideration, there is a problem that the contaminated ink may adversely affect the ejection.
- the present invention has been made in view of such circumstances, and provides a liquid supply device, a control method for the liquid supply device, and a printing device in which a contaminated liquid does not adversely affect ejection and effectively prevents sedimentation.
- the purpose is to provide.
- the liquid supply device for achieving the above object is a circulation flow path for supplying a liquid from a liquid tank for storing the liquid to the liquid discharge head and collecting the liquid from the liquid discharge head to the liquid tank, and circulation.
- the processor is provided with a pump provided in the flow path to generate a flow in the liquid in the circulation flow path, a memory for storing instructions to be executed by the processor, and a processor for executing the instructions stored in the memory.
- a sequence is performed that includes a second process, which produces a negative flow in the direction opposite to the first direction, in which the first flow path is in the liquid between the positive flow liquid tank and the liquid discharge head.
- a liquid supply device in which a filter for removing foreign matter is arranged, the flow rate of a positive flow liquid is larger than the flow rate of a negative flow liquid, and the negative flow has a steady flow state.
- a sequence including a first process for generating a positive flow in the liquid in the first flow path and a second process for generating a negative flow is performed, and the first flow path is a positive flow.
- a filter that removes foreign matter in the liquid is placed between the liquid tank and the liquid discharge head so that the flow rate of the positive flow liquid is larger than the flow rate of the negative flow liquid and the negative flow has a steady flow state. Therefore, the contaminated liquid does not adversely affect the discharge, and the sedimentation can be effectively prevented.
- the first flow path does not have a filter for removing foreign matter in the liquid between the negative flow liquid tank and the liquid discharge head. This embodiment is suitable even when the filter is not arranged between the negative flow liquid tank and the liquid discharge head.
- the processor preferably executes the sequence multiple times. By carrying out the negative flow a plurality of times, it is possible to obtain the total flow rate of the negative flow while suppressing the return of the contaminated liquid, so that the prevention of sedimentation in the liquid becomes more effective.
- the first flow path preferably includes a second flow path different from the circulation flow path. Sedimentation can be effectively prevented by performing the sequence even in the flow path where the liquid does not circulate.
- the flow rate of the negative flow liquid is preferably smaller than the volume of the second flow path. This makes it possible to prevent the contaminated liquid in the second flow path from diffusing into the first flow path due to the negative flow.
- the processor replaces the liquid in the second flow path with a liquid from which foreign matter has been removed by a filter by controlling the pump before performing the sequence. This makes it possible to prevent the contaminated liquid from diffusing into the first flow path due to the negative flow.
- the processor can control the pump to replace the liquid in all the flow paths where the negative flow liquid flows in the first flow path with the liquid whose foreign matter has been removed by the filter. preferable. As a result, normal operation can be started in an appropriate state.
- One aspect of the printing apparatus for achieving the above object is a movement in which the liquid tank for storing the liquid, the liquid discharge head for discharging the liquid from the discharge port, and the liquid discharge head and the printing substrate are relatively moved.
- a mechanism and the above-mentioned liquid supply device are provided, and the processor discharges liquid from the discharge port of the liquid discharge head while relatively moving the liquid discharge head and the printing base material, and prints an image on the printing base material.
- It is a printing apparatus that circulates a liquid in a circulation flow path at the time of printing and executes a sequence at the time of non-printing other than at the time of printing.
- the volume velocity of the forward flow is at least temporarily higher than the volume velocity at the time of printing. This makes it possible to prevent sedimentation in the first flow path due to the forward flow.
- volume velocity of the negative flow is at least temporarily higher than the volume velocity at the time of printing. This makes it possible to prevent sedimentation in the first flow path due to negative flow.
- the liquid preferably has a dispersed particle diameter of more than 100 nm. This embodiment is suitable when supplying a liquid in which particles are likely to settle.
- the liquid is preferably white ink containing a titanium oxide material.
- This embodiment is suitable when supplying a white ink containing a titanium oxide material in which pigment precipitation is a problem.
- the circulation flow path includes a valve that opens and closes a part of the circulation flow path, and the processor controls the valve to determine the first flow path.
- the desired flow path can be used as the first flow path.
- One aspect of the control method of the liquid supply device for achieving the above object is a circulation flow path in which the liquid is supplied from the liquid tank for storing the liquid to the liquid discharge head and the liquid is collected from the liquid discharge head to the liquid tank. It is a control method of a liquid supply device provided with a pump provided in the circulation flow path to generate a flow in the liquid in the circulation flow path, and by controlling the pump, at least a part of the circulation flow path can be controlled.
- the sequence including the process of 2 is carried out, and in the first flow path, a filter for removing foreign substances in the liquid is arranged between the liquid tank of the positive flow and the liquid discharge head, and the flow rate of the liquid of the positive flow is A method of controlling a liquid supply device, which is larger than the flow rate of a liquid in a negative flow and has a state of a steady flow in the negative flow.
- a sequence including a first process for generating a positive flow in the liquid in the first flow path and a second process for generating a negative flow is performed, and the first flow path is a positive flow.
- a filter that removes foreign matter in the liquid is placed between the liquid tank and the liquid discharge head so that the flow rate of the positive flow liquid is larger than the flow rate of the negative flow liquid and the negative flow has a steady flow state. Therefore, the contaminated liquid does not adversely affect the discharge, and the sedimentation can be effectively prevented.
- the contaminated liquid does not adversely affect the discharge and can effectively prevent sedimentation.
- FIG. 1 is a diagram showing an overall configuration of an ink supply device.
- FIG. 2 is a block diagram showing a configuration of a control system of an ink supply device.
- FIG. 3 is a diagram showing the flow of ink during normal operation of the ink supply device.
- FIG. 4 is a diagram showing the flow of ink in the maintenance operation according to the first embodiment of the ink supply device.
- FIG. 5 is a diagram showing the flow of ink in the maintenance operation according to the first embodiment of the ink supply device.
- FIG. 6 is a diagram showing the time change of the ink flow rate of the negative flow of a certain flow path after driving the supply pump and the recovery pump in the negative direction.
- FIG. 1 is a diagram showing an overall configuration of an ink supply device.
- FIG. 2 is a block diagram showing a configuration of a control system of an ink supply device.
- FIG. 3 is a diagram showing the flow of ink during normal operation of the ink supply device.
- FIG. 4 is a diagram
- FIG. 7 is a diagram showing the time change of the ink flow rate of the negative flow of a certain flow path after driving the supply pump and the recovery pump in the negative direction.
- FIG. 8 is a flowchart showing a process of a control method at the time of maintenance operation of the ink supply device.
- FIG. 9 is a diagram showing the flow of ink in the maintenance operation according to the second embodiment of the ink supply device.
- FIG. 10 is a diagram showing the flow of ink in the maintenance operation according to the second embodiment of the ink supply device.
- FIG. 11 is a diagram showing the flow of ink in the maintenance operation according to the third embodiment of the ink supply device.
- FIG. 12 is a diagram showing the flow of ink in the maintenance operation according to the third embodiment of the ink supply device.
- FIG. 13 is a diagram showing the flow of ink in the maintenance operation according to the fourth embodiment of the ink supply device.
- FIG. 14 is a diagram showing the flow of ink in the maintenance operation according to the fourth embodiment of the ink supply device.
- FIG. 15 is an overall configuration diagram of an inkjet printing device to which an ink supply device is applied.
- FIG. 16 is a plan perspective view showing a structural example of the head module.
- FIG. 17 is a cross-sectional view taken along the line 17-17 of FIG.
- FIG. 18 is a block diagram showing a configuration of a control system of an inkjet printing apparatus.
- FIG. 1 is a diagram showing an overall configuration of an ink supply device 10 (an example of a liquid supply device).
- the ink supply device 10 is a device that supplies ink from the buffer tank 12 to the inkjet bar 14, and includes a supply flow path 16 and a recovery flow path 18 as shown in FIG.
- the buffer tank 12 (an example of a liquid tank) is an ink storage means in which ink (an example of a liquid) for supplying to the inkjet bar 14 is stored.
- the inkjet bar 14 (an example of a liquid ejection head) has n head modules 15 (15-1, 15-2, ..., 15) each provided with a plurality of nozzles 202 (see FIG. 17) for ejecting ink. -N) is provided.
- the n head modules 15 are joined in one direction.
- Each head module 15 has an ink supply port 15A and an ink discharge port 15B, respectively.
- the supply flow path 16 communicates the buffer tank 12 and the inkjet bar 14.
- the recovery flow path 18 communicates the inkjet bar 14 and the buffer tank 12.
- the ink stored in the buffer tank 12 is supplied to the inkjet bar 14 via the supply flow path 16.
- Ink that is not used in the inkjet bar 14 is collected in the buffer tank 12 via the collection flow path 18.
- the supply flow path 16 and the recovery flow path 18 include, for example, a tube. Each component of the supply flow path 16 and the recovery flow path 18 is appropriately connected by a joint F.
- the supply flow path 16 is provided with a degassing module 22, a supply pump 24, a supply side filter 26, and a heat exchanger 28. Further, in the supply flow path 16, the supply side back pressure tank 30, the supply side head manifold 32, the supply side pressure sensor 34, and the supply valve 36 (36-1, 36-2, ..., 36- n) and supply dampers 38 (38-1, 38-2, ..., 38-n) are provided.
- the recovery flow path 18 is provided with a recovery pump 50 and a recovery flow path valve 52. Further, in the recovery flow path 18, a recovery damper 40 (40-1, 40-2, ..., 40-n) and a recovery valve 42 (42-1, 42-2, ..., 42-) are provided inside the inkjet bar 14. n), the recovery side head manifold 44, the recovery side pressure sensor 46, and the recovery side back pressure tank 48 are provided.
- the degassing module 22 performs ink degassing processing.
- the supply pump 24 applies pressure to the ink inside the supply flow path 16 to generate a flow in the ink inside the supply flow path 16.
- the supply pump 24 is, for example, a tube pump.
- the supply-side filter 26 removes air bubbles and foreign matter in the ink.
- the heat exchanger 28 adjusts the temperature of the ink.
- the supply side back pressure tank 30 is a pressure shock absorber that adjusts the pressure so as to suppress fluctuations in the internal pressure of the supply flow path 16.
- the back pressure tank 30 on the supply side separates the liquid chamber 30C communicating with the supply flow path 16 via the ink inlet 30A and the ink outlet 30B, the air chamber 30D in which gas is stored, and the liquid chamber 30C and the air chamber 30D. It has an elastic membrane 30E, a bubble discharge port 30F provided in the liquid chamber 30C, and an air flow path communication port 30G provided in the air chamber 30D.
- the ink inlet 30A communicates with the heat exchanger 28.
- the ink outlet 30B communicates with the supply side head manifold 32.
- the elastic film 30E is deformed toward the air chamber 30D according to the volume of the inflowing ink.
- the volume of ink flowing out from the ink outlet 30B does not change. Therefore, the pressure fluctuation of the supply flow path 16 can be suppressed. That is, the supply-side back pressure tank 30 has a pressure buffer function that suppresses fluctuations in the internal pressure of the inkjet bar 14 and fluctuations in the internal pressure of the supply flow path 16 due to pulsating current from the operation of the supply pump 24.
- the bubble discharge port 30F communicates with the drain flow path 54.
- the drain flow path 54 communicates the bubble discharge port 30F with the buffer tank 12.
- the drain flow path 54 is a flow path for forcibly discharging the ink in the liquid chamber 30C.
- the drain flow path 54 is provided with a drain valve 56 that switches between communication (open state) and shutoff (closed state) between the bubble discharge port 30F and the buffer tank 12. When the drain valve 56 is opened, the ink in the liquid chamber 30C is sent to the buffer tank 12.
- the supply-side back pressure tank 30 has an air flow path 58, an air connect valve 59, an air tank 60, an atmospheric communication passage 61, and an air valve as gas elastic adjusting portions for determining the pressure buffering performance of the supply-side back pressure tank 30. 62 is provided.
- the air flow path communication port 30G communicates with the air flow path 58.
- the air connect valve 59 is an air flow path opening / closing means for switching between communication and interruption of the air flow path 58, and the air chamber 30D communicates with the air tank 60 via the air connect valve 59.
- the atmospheric communication passage 61 is provided with an air valve 62 that switches between communication and interruption of the atmospheric communication passage 61, and the air tank 60 communicates with the atmosphere through the atmospheric communication passage 61.
- a normally open type solenoid valve is used for the air connect valve 59. Further, by applying a normally closed type solenoid valve to the air valve 62, ink is not leaked from the inkjet bar 14 even if the power is cut off when the emergency stop function is activated or the like.
- the air chamber 30D communicates with the air tank 60 by opening the air connect valve 59, and the volume of the air chamber 30D can be increased according to the pressure control of the ink feed. Further, by opening the air valve 62, the air tank 60 and the air chamber 30D can communicate with the atmosphere.
- the air tank 60 functions as a buffer tank for the air chamber 30D.
- the supply side head manifold 32 and the recovery side head manifold 44 are temporary ink storage portions.
- the supply-side head manifold 32 and the recovery-side head manifold 44 are communicated with each other by a first bypass flow path 64 and a second bypass flow path 66.
- the first bypass flow path 64 is provided with a first bypass flow path valve 68
- the second bypass flow path 66 is provided with a second bypass flow path valve 69.
- the supply side pressure sensor 34 is a pressure measuring means that measures and outputs the internal pressure of the supply flow path 16.
- the recovery side pressure sensor 46 is a pressure measuring means that measures and outputs the internal pressure of the recovery flow path 18. Sensors such as a semiconductor piezo resistance type, a capacitance type, and a silicon resonant type can be applied to the supply side pressure sensor 34 and the recovery side pressure sensor 46.
- the head module 15 includes an ink supply port 15A and an ink discharge port 15B.
- the ink supply ports 15A of the head modules 15-1, 15-2, ..., 15-n are communicated with the supply side head manifold 32 via the supply valves 36-1, 36-2, ..., 36-n, respectively. Ru. Further, the ink discharge ports 15B of the head modules 15-1, 15-2, ..., 15-n are connected to the recovery side head manifold 44 via the recovery valves 42-1, 42-2, ..., 42-n, respectively. Communicate.
- the supply valve 36 (36-1, 36-2, ..., 36-n) is a flow path opening / closing means for switching between communication and interruption of the supply flow path 16.
- the recovery valve 42 (42-1, 42-2, ..., 42-n) is a flow path opening / closing means for switching between communication and interruption of the recovery flow path 18.
- a normally closed type (or latch type) solenoid valve whose opening and closing is controlled by a control signal is applied to the supply valve 36 and the recovery valve 42, and even if the power is cut off when the emergency stop function is activated, the head It is configured to prevent ink from leaking from the module 15.
- Supply dampers 38-1, 38-2, ..., 38-n are provided between the supply valves 36-1, 36-2, ..., 36-n and each ink supply port 15A, respectively. Further, recovery dampers 40-1, 40-2, ..., 40-n are provided between the recovery valves 42-1, 42-2, ..., 42-n and each ink ejection port 15B, respectively. ..
- the supply damper 38 and the recovery damper 40 are pressure buffering means for suppressing the pulsation of ink generated by the ejection operation of the inkjet bar 14, respectively.
- the recovery side back pressure tank 48 is a pressure shock absorber that adjusts the pressure so as to suppress fluctuations in the internal pressure of the recovery flow path 18, and is configured in the same manner as the supply side back pressure tank 30.
- the recovery side back pressure tank 48 includes a liquid chamber 48C communicating with the recovery flow path 18 via the ink inlet 48A and the ink outlet 48B, an air chamber 48D in which gas is stored, and a liquid chamber 48C and an air chamber 48D. It has an elastic film 48E, an air bubble discharge port 48F provided in the liquid chamber 48C, and an air flow path communication port 48G provided in the air chamber 48D.
- the bubble discharge port 48F communicates with the buffer tank 12 via a drain flow path 54 provided with a drain valve 70.
- the air flow path communication port 48G communicates with the atmospheric communication passage 74 via the air flow path 71, the air connect valve 72, the air tank 73, and the air valve 75.
- the recovery pump 50 applies pressure to the ink inside the recovery flow path 18 to generate a flow in the ink inside the recovery flow path 18.
- the recovery pump 50 is, for example, a tube pump.
- the recovery flow path valve 52 is a flow path opening / closing means for switching between communication and disconnection between the recovery pump 50 and the buffer tank 12.
- the ink supply device 10 includes an ink main tank 76, a replenishment flow path 78, an overflow flow path 80, and a replenishment pump 82.
- the ink main tank 76 is an ink storage means for storing ink for supplying to the buffer tank 12.
- the replenishment flow path 78 communicates the ink main tank 76 with the buffer tank 12.
- the overflow flow path 80 communicates the buffer tank 12 and the ink main tank 76.
- the replenishment pump 82 applies pressure to the ink inside the replenishment flow path 78 to generate a flow in the ink inside the replenishment flow path 78.
- the replenishment pump 82 is, for example, a tube pump.
- ink is replenished from the ink main tank 76 to the buffer tank 12.
- a main tank filter 76A is provided at the end of the replenishment flow path 78 on the ink main tank 76 side, and the buffer tank 12 is replenished with ink from which foreign matter has been removed by the main tank filter 76A. Further, when the ink is excessively replenished, the ink is returned from the buffer tank 12 to the ink main tank 76.
- the ink supply device 10 includes a first safety valve 84, a second safety valve 86, a third safety valve 88, a recovery side filter 90, and a recovery side filter valve 92.
- the ink supply device 10 When the internal pressure of the supply flow path 16 rises above a predetermined value, the ink supply device 10 operates the first safety valve 84 and the second safety valve 86 to reduce the internal pressure of the supply flow path 16. Further, when the internal pressure of the recovery flow path 18 rises above a predetermined value, the ink supply device 10 operates the third safety valve 88 to reduce the internal pressure of the recovery flow path 18.
- the recovery side filter valve 92 is a flow path opening / closing means for switching between communication and shutoff between the recovery pump 50 and the degassing module 22. By opening the recovery side filter valve 92, the ink supply device 10 can pass the ink that has passed through the degassing module 22 to the recovery side filter 90.
- FIG. 2 is a block diagram showing a configuration of a control system of the ink supply device 10.
- the ink supply device 10 includes a general control unit 94, a valve control unit 97, and a pump control unit 98.
- the integrated control unit 94 controls the operation of the ink supply device 10 by controlling the valve control unit 97 and the pump control unit 98, respectively.
- the integrated control unit 94 includes a processor 95 and a memory 96.
- the processor 95 executes the instruction stored in the memory 96.
- the hardware structure of the processor 95 is various processors (processors) as shown below.
- the various processors include a CPU (Central Processing Unit), which is a general-purpose processor that executes software (programs) and acts as various functional units, and a GPU (Graphics Processing Unit), which is a processor specialized in image processing. It has a circuit configuration specially designed to execute specific processing such as PLD (ProgrammableLogicDevice) and ASIC (ApplicationSpecificIntegratedCircuit), which are processors whose circuit configuration can be changed after manufacturing FPGA (FieldProgrammableGateArray). A dedicated electric circuit that is a processor is included.
- One processing unit may be composed of one of these various processors, or may be composed of two or more processors of the same type or different types (for example, a plurality of FPGAs, or a combination of CPU and FPGA, or with a CPU. It may be composed of a combination of GPUs).
- a plurality of functional units may be configured by one processor.
- one processor is configured by a combination of one or more CPUs and software, as represented by a computer such as a client or a server. There is a form in which the processor acts as a plurality of functional parts.
- SoC System On Chip
- IC Integrated Circuit
- the hardware-like structure of these various processors is, more specifically, an electric circuit (circuitry) in which circuit elements such as semiconductor elements are combined.
- the memory 96 stores an instruction to be executed by the processor 95.
- the memory 96 includes a RAM (RandomAccessMemory) and a ROM (ReadOnlyMemory) (not shown).
- the processor 95 uses the RAM as a work area, executes software using various programs and parameters including a control program of the ink supply device 10 stored in the ROM, and uses the parameters stored in the ROM or the like. Then, various processes of the ink supply device 10 are executed.
- the valve control unit 97 includes a supply valve 36, a recovery valve 42, a recovery flow path valve 52, a drain valve 56, a first bypass flow path valve 68, a second bypass flow path valve 69, a drain valve 70, and a recovery side filter. It controls the open state and the closed state of the valve 92, respectively.
- the valve control unit 97 may control the open state and the closed state of the air connect valve 59, the air valve 62, the air connect valve 72, and the air valve 75, respectively.
- the pump control unit 98 controls the operation of each of the supply pump 24, the recovery pump 50, and the replenishment pump 82.
- FIG. 3 is a diagram showing the flow of ink during normal operation of the ink supply device 10.
- the circulation flow path 20 in which ink circulates during normal operation is composed of a supply flow path 16 and a recovery flow path 18. That is, the circulation flow path 20 includes the valve tank 12, the degassing module 22, the supply pump 24, the supply side filter 26, the heat exchanger 28, the supply side back pressure tank 30, the supply side head manifold 32, and the first bypass flow path.
- the filled valve is shown to be in the closed state. That is, in normal operation, the valve control unit 97 closes the drain valve 56, the drain valve 70, and the recovery side filter valve 92, and the supply valve 36, the recovery valve 42, the recovery flow path valve 52, and the first bypass flow. The path valve 68 and the second bypass flow path valve 69 are opened. Further, the pump control unit 98 rotates the supply pump 24 and the recovery pump 50 in the positive direction in normal operation. As a result, the ink supply device 10 circulates ink between the buffer tank 12 and the inkjet bar 14 by the circulation flow path 20, as shown by the arrow in FIG.
- the ink that has left the buffer tank 12 first passes through the degassing module 22 to remove the dissolved air in the ink.
- the dissolved air is removed, and the ink that has passed through the supply pump 24 passes through the supply side filter 26 to remove foreign matter in the ink.
- the temperature of the ink from which the foreign matter has been removed passes through the heat exchanger 28 and is adjusted.
- the temperature-adjusted ink passes through the supply-side back pressure tank 30, so that fluctuations in the internal pressure of the supply flow path 16 are suppressed.
- the ink that has passed through the supply-side back pressure tank 30 is supplied to the head module 15 via the supply-side head manifold 32.
- the ink supplied to the head module 15 may be ejected from the nozzle 202 (see FIG. 17) if necessary.
- the ink not ejected from the nozzle 202 is collected from the head module 15 to the collection side head manifold 44.
- the ink recovered in the recovery side head manifold 44 passes through the recovery side back pressure tank 48, so that fluctuations in the internal pressure of the recovery flow path 18 are suppressed.
- the ink that has passed through the recovery side back pressure tank 48 passes through the recovery pump 50 and the recovery flow path valve 52 and returns to the buffer tank 12.
- the ink stored in the buffer tank 12 of the ink supply device 10 is usually contaminated. This is because foreign matter can enter the ink supplied from the ink main tank 76, and the pigment settles while being left inside the buffer tank 12 for a long time. As shown in FIG. 3, the ink supply device 10 can prevent the contaminated ink from spreading inside the circulation flow path 20 by passing the ink through the supply side filter 26 during normal operation. ..
- the tube pump is applied as the supply pump 24 and the recovery pump 50, but other types of pumps such as a diaphragm pump may be applied.
- the supply pump 24 and the recovery pump 50 read the measured values of the supply side pressure sensor 34 and the recovery side pressure sensor 46, respectively, and control the rotation speed by PID control or the like so that the pressure becomes appropriate.
- the flow path is such that ink is circulated to the inside of the head module 15 during normal operation, but at least one of the supply valve 36 and the recovery valve 42 is closed and the supply side head manifold is closed. Only 32 and the recovery side head manifold 44 may be circulated. Further, the ink may be circulated intermittently instead of being constantly circulated during normal operation.
- FIGS. 4 and 5 are diagrams showing the flow of ink in the maintenance operation according to the first embodiment of the ink supply device 10.
- the ink supply device 10 causes the ink in the stirring flow path 99A (an example of the first flow path) including at least a part of the circulation flow path 20 to generate a positive flow in the first direction, at least in the maintenance operation. And a second process of causing the ink in the stirring channel 99A to generate a negative flow in the direction opposite to the first direction.
- the stirring flow path 99A includes a buffer tank 12, a degassing module 22, a supply pump 24, a supply side filter 26, a heat exchanger 28, a supply side back pressure tank 30, and a supply side head manifold. 32, a flow path connecting the first bypass flow path 64 and the second bypass flow path 66, the recovery side head manifold 44, the recovery side back pressure tank 48, the recovery pump 50, the recovery flow path valve 52, and the buffer tank 12. be.
- the filled valve is shown to be in the closed state. That is, in the maintenance operation, the valve control unit 97 closes the supply valve 36, the recovery valve 42, the drain valve 56, the drain valve 70, and the recovery side filter valve 92, and closes the recovery flow path valve 52 and the first bypass flow. The path valve 68 and the second bypass flow path valve 69 are opened.
- the ink in the buffer tank 12 is the degassing module 22, the supply pump 24, the supply side filter 26, the heat exchanger 28, and the supply side back pressure tank. 30, via the supply side head manifold 32, the first bypass flow path 64 and the second bypass flow path 66, the recovery side head manifold 44, the recovery side back pressure tank 48, the recovery pump 50, and the recovery flow path valve 52.
- This is a flow in the first direction returning to the buffer tank 12.
- the supply side filter 26 is arranged between the buffer tank 12 of the positive flow and the inkjet bar 14.
- the pump control unit 98 rotates the supply pump 24 and the recovery pump 50 in the positive direction.
- the ink in the buffer tank 12 is collected from the recovery flow path valve 52, the recovery pump 50, the recovery side back pressure tank 48, and the recovery side head manifold 44.
- the flow is in the direction opposite to the first direction of returning to the buffer tank 12 via.
- the filter is not arranged between the buffer tank 12 of the negative flow and the inkjet bar 14, that is, the filter is not arranged.
- the pump control unit 98 rotates the supply pump 24 and the recovery pump 50 in the negative direction.
- V2 U2 ⁇ T2
- V2 U2 ⁇ T2
- the negative flow is limited to the circulation of the supply side head manifold 32 and the recovery side head manifold 44 by closing the supply valve 36 and the recovery valve 42.
- the ink volume V1 flowing in the forward flow and the ink volume V2 flowing in the negative flow are V1> V2 by the start of the next normal operation. That is, it is preferable that the flow rate of the positive flow ink of the first process is larger than the flow rate of the negative flow ink of the second process.
- Positive flow and negative flow can be realized by alternately switching the rotation direction of the tube pump applied to the supply pump 24 and the recovery pump 50. Since the load on the tube pump is reduced and the ink flow has inertia, it is desirable to allow a waiting time of about 1 second before changing the direction of the ink flow. However, since this depends on the flow path design and pump capacity, it cannot be said unconditionally, so it depends on the design.
- FIGS. 6 and 7 are diagrams showing the time change of the ink flow velocity of the negative flow of a certain flow path after driving the supply pump 24 and the recovery pump 50 in the negative direction.
- the horizontal axis represents time and the vertical axis represents ink flow rate.
- the ink flow velocity gradually increases from the timing T 0 when the drive of the supply pump 24 and the recovery pump 50 is started, and becomes the flow velocity of the steady flow at the timing TS.
- the time until the steady flow is reached is TS ⁇ T 0
- the time T2 for generating the negative flow is set so as to satisfy T2> TS ⁇ T 0 .
- the ink flow velocity gradually increases from the timing T 0 when the drive of the supply pump 24 and the recovery pump 50 is started, and then decreases, and then becomes the steady flow velocity at the timing TS.
- the time until the steady flow is reached is also TS ⁇ T 0
- the time T2 for generating the negative flow is set so as to satisfy T2> TS ⁇ T 0 .
- the ink flow path system has a pressure loss component, an inertia component, and an acoustic capacity component.
- the ink flow and pressure due to the negative flow do not occur as expected even if the pump is driven for a short time, and the pigment precipitate, which is expected as the effect of the negative flow, is formed. Foreign matter including it cannot be moved.
- the negative flow since the negative flow has a steady flow state for at least a certain period of time, pigment precipitates and foreign substances can be effectively removed.
- FIG. 8 is a flowchart showing the processing of the control method during the maintenance operation of the ink supply device 10.
- the processor 95 reads the control program of the ink supply device 10 from the memory 96 and executes it.
- the control program may be stored and provided in a non-temporary storage medium, or may be provided via a network (not shown).
- the valve control unit 97 includes a supply valve 36, a recovery valve 42, a recovery flow path valve 52, a drain valve 56, a first bypass flow path valve 68 and a second bypass flow path valve 69, and a drain valve 70.
- the recovery side filter valve 92 is controlled to determine the ink flow path.
- valve control unit 97 closes the supply valve 36, the recovery valve 42, the drain valve 56, the drain valve 70, and the recovery side filter valve 92, and the recovery flow path valve 52 and the first bypass flow path valve 68. , And by opening the second bypass flow path valve 69, the stirring flow path 99A shown in FIGS. 4 and 5 is generated.
- Step S2 is a process of generating a positive flow in the ink inside the stirring flow path 99A before carrying out the stirring sequence.
- the pump control unit 98 controls the supply pump 24 and the recovery pump 50 to generate a positive flow in the ink inside the stirring flow path 99A.
- the pump control unit 98 rotates the supply pump 24 and the recovery pump 50 in the positive direction to flow a volume of ink larger than the volume of the circulation flow path 20. In this way, a positive flow is generated before starting from the negative flow, which is the second process, and the ink inside the stirring flow path 99A is replaced with the ink in a fresh state that has passed through the supply side filter 26. Is preferable.
- step S3 the processor 95 executes the second process of the stirring sequence. That is, the pump control unit 98 controls the supply pump 24 and the recovery pump 50 to generate a negative flow having a steady flow state in the ink inside the stirring flow path 99A for at least a certain period of time.
- the pump control unit 98 rotates the supply pump 24 and the recovery pump 50 in the negative direction, and flows ink having an ink volume V2 at an ink volume velocity U2.
- the ink volume velocity U2 is faster than the ink volume velocity U0 during normal operation. This makes it possible to effectively remove pigment precipitates and foreign substances in the ink, which are difficult to remove.
- step S4 the processor 95 executes the first process of the stirring sequence. That is, the pump control unit 98 controls the supply pump 24 and the recovery pump 50 to generate a positive flow in the ink inside the stirring flow path 99A.
- the pump control unit 98 rotates the supply pump 24 and the recovery pump 50 in the positive direction, and flows ink having an ink volume V1 at an ink volume velocity U1.
- V1 is larger than V2.
- the ink in the inkjet bar 14 can be replaced with the ink in a fresh state that has passed through the supply side filter 26.
- the ink volume velocity U1 is faster than the ink volume velocity U0 during normal operation. This makes it possible to effectively remove pigment precipitates and foreign substances in the ink, which are difficult to remove.
- the processor 95 first carries out the stirring sequence from the negative flow, which is the second process, and then carries out the positive flow, which is the first process.
- the processor 95 may perform the stirring sequence only once, but in the present embodiment, the second process of step S3 and the first process of step S4 are repeated a plurality of times.
- the stirring sequence may include processes other than the first process and the second process, such as a process of switching between communication and shutoff of an arbitrary valve and a process of stopping an arbitrary pump. That is, the stirring sequence may include at least a first process and a second process.
- the ink inside the stirring flow path 99A is replaced with the ink in a fresh state that has passed through the supply side filter 26 by flowing an ink having a volume larger than the volume of the circulation flow path 20 by a positive flow. Even better.
- the valve control unit 97 includes a supply valve 36, a recovery valve 42, a recovery flow path valve 52, a drain valve 56, a first bypass flow path valve 68, a second bypass flow path valve 69, and a drain.
- the valve 70 and the recovery side filter valve 92 are controlled, and the processing of this flowchart is completed.
- the valve control unit 97 closes the drain valve 56, the drain valve 70, and the recovery side filter valve 92, and the supply valve 36, the recovery valve 42, the recovery flow path valve 52, and the first bypass flow path valve 68.
- the pump control unit 98 may control the supply pump 24 and the recovery pump 50.
- FIGSecond Embodiment 9 and 10 are diagrams showing the flow of ink in the maintenance operation according to the second embodiment of the ink supply device 10.
- the ink supply device 10 has a first process of generating a positive flow in the ink in the stirring flow path 99B (an example of the first flow path) including at least a part of the circulation flow path 20, and stirring at least in the maintenance operation.
- a stirring sequence comprising a second process of creating a negative flow in the ink in the flow path 99B is performed.
- the stirring flow path 99B includes a buffer tank 12, a degassing module 22, a supply pump 24, a supply side filter 26, a heat exchanger 28, a supply side back pressure tank 30, and a drain valve 56. It is a flow path connecting the buffer tank 12 and the buffer tank 12. As described above, the stirring flow path 99B does not include the supply side head manifold 32 and the recovery side head manifold 44. Further, of the stirring flow path 99B, the drain flow path 54 (an example of the second flow path) connecting the supply side back pressure tank 30, the drain valve 56, and the buffer tank 12 shown by the thick line in FIG. 10 is in normal operation. It is a flow path that is sometimes not used.
- the filled valve is shown to be in the closed state. That is, in the maintenance operation, the valve control unit 97 has a supply valve 36, a recovery valve 42, a recovery flow path valve 52, a first bypass flow path valve 68, a second bypass flow path valve 69, a drain valve 70, and recovery.
- the side filter valve 92 is closed and the drain valve 56 is open.
- the ink in the buffer tank 12 is the degassing module 22, the supply pump 24, the supply side filter 26, the heat exchanger 28, and the supply side back pressure tank. It is a flow returning to the buffer tank 12 via the 30 and the drain valve 56.
- the supply side filter 26 is arranged between the buffer tank 12 of the positive flow and the inkjet bar 14.
- the pump control unit 98 rotates the supply pump 24 in the positive direction and flows ink having an ink volume V1 at an ink volume velocity U1.
- the ink in the buffer tank 12 is the drain valve 56, the supply side back pressure tank 30, the heat exchanger 28, the supply side filter 26, and the supply pump 24. , And a flow returning to the buffer tank 12 via the degassing module 22.
- the filter is not arranged between the buffer tank 12 of the negative flow and the inkjet bar 14.
- the pump control unit 98 rotates the supply pump 24 in the negative direction to flow ink having an ink volume V2 at an ink volume velocity U2. Negative flow has a steady flow state for at least a certain period of time.
- the ink that has not passed through the filter can flow into the inside of the inkjet bar 14. Therefore, as in the first embodiment, it is preferable that the ink volume V1 and the ink volume V2 satisfy the relationship of V1> V2. Further, it is desirable that the stirring sequence is performed not only once but multiple times. Further, it is preferable that the ink volume velocity U1 and the ink volume velocity U2 satisfy the relations of U1> U0 and U2> U0 with respect to the ink volume velocity U0 during normal operation.
- the ink flows in the drain flow path 54 in which the ink does not flow during normal operation. Since the drain flow path 54 has few opportunities for ink to flow during normal operation, the pigment is likely to settle, and the pigment can be prevented from settling by the stirring sequence.
- the ink volume V2 of the negative flow is smaller than the volume V3 of the drain flow path 54. This makes it possible to reduce the possibility that the ink that has not passed through the supply side filter 26 will flow to an inappropriate region such as the inside of the inkjet bar 14.
- FIGS. 11 and 12 are diagrams showing the flow of ink in the maintenance operation according to the third embodiment of the ink supply device 10.
- the ink supply device 10 has a first process of generating a positive flow in the ink in the stirring flow path 99C (an example of the first flow path) including at least a part of the circulation flow path 20, and stirring at least in the maintenance operation.
- a stirring sequence comprising a second process of creating a negative flow in the ink in the flow path 99C is performed.
- the stirring flow path 99C includes a buffer tank 12, a degassing module 22, a recovery side filter valve 92, a recovery side filter 90, a recovery pump 50, a recovery side back pressure tank 48, and a drain valve 70. , And a flow path connecting the buffer tank 12.
- the stirring flow path 99C does not include the supply side head manifold 32 and the recovery side head manifold 44.
- the drain flow path 54 (an example of the second flow path) connecting the recovery side back pressure tank 48, the drain valve 70, and the buffer tank 12 shown by the thick line in FIG. 12 is in normal operation. It is a flow path that is sometimes not used.
- the filled valve is shown to be in the closed state. That is, the valve control unit 97 closes the supply valve 36, the recovery valve 42, the recovery flow path valve 52, the drain valve 56, the first bypass flow path valve 68, and the second bypass flow path valve 69, and drains.
- the valve 70 and the recovery side filter valve 92 are opened.
- the ink in the buffer tank 12 has the degassing module 22, the recovery side filter valve 92, the recovery side filter 90, the recovery pump 50, and the recovery side back pressure. It is a flow returning to the buffer tank 12 via the tank 48 and the drain valve 70.
- the recovery side filter 90 is arranged between the buffer tank 12 of the positive flow and the inkjet bar 14.
- the pump control unit 98 rotates the recovery pump 50 in the negative direction to flow ink having an ink volume V1 at an ink volume velocity U1.
- the ink in the buffer tank 12 is the drain valve 70, the recovery side back pressure tank 48, the recovery pump 50, the recovery side filter 90, and the recovery side filter valve. It is a flow returning to the buffer tank 12 via the 92 and the degassing module 22.
- the filter is not arranged between the buffer tank 12 of the negative flow and the inkjet bar 14.
- the pump control unit 98 rotates the recovery pump 50 in the positive direction and flows ink having an ink volume V2 at an ink volume velocity U2. Negative flow has a steady flow state for at least a certain period of time.
- the ink that has not passed through the filter can flow into the inkjet bar 14. Therefore, it is preferable that the ink volume V1 and the ink volume V2 satisfy the relationship of V1> V2 as in the past. Further, it is desirable that the stirring sequence is performed not only once but multiple times. Further, it is preferable that the ink volume velocity U1 and the ink volume velocity U2 satisfy the relations of U1> U0 and U2> U0 with respect to the ink volume velocity U0 during normal operation.
- the ink flows in the drain flow path 54 in which the ink does not flow during normal operation. Since the drain flow path 54 has few opportunities for ink to flow during normal operation, the pigment is likely to settle, and the pigment can be prevented from settling by the stirring sequence.
- the ink volume V2 of the negative flow is smaller than the volume V4 of the drain flow path 54. This makes it possible to reduce the possibility that the ink that has not passed through the recovery side filter 90 will flow to an inappropriate region.
- the ink supply device 10 can be stably operated without the pigment and foreign matter in the ink settling in the unused tube.
- the filter is not arranged between the buffer tank 12 of the negative flow of the stirring channels 99A, 99B, and 99C to the inkjet bar 14 , but the filter may be arranged.
- foreign matter accumulates on the inkjet bar 14 side of the filter during normal operation.
- a negative flow is generated in the filter during the maintenance operation, foreign matter is peeled off from the filter and flows to the inkjet bar 14 side. Therefore, in the point that the contaminated ink flows to the inkjet bar 14 side in the negative flow, there is a similar problem regardless of whether or not the filter is arranged between the buffer tank 12 and the inkjet bar 14 in the negative flow.
- FIG. 13 and 14 are diagrams showing the flow of ink in the overall configuration and maintenance operation of the ink supply device 100 (an example of the liquid supply device).
- the parts common to the ink supply device 10 shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.
- the inkjet bar 102 has an ink flow path configuration that does not circulate ink up to the head module 15. That is, the head module 15 includes an ink supply port 15A and does not include an ink discharge port 15B.
- the ink supplied to the supply-side head manifold 32 is supplied to the head module 15 via the supply valve 36 and the supply damper 38.
- the ink supply device 100 causes a first process of generating a positive flow in the ink in the stirring flow path 99D (an example of the first flow path) and a negative flow in the ink in the stirring flow path 99D, at least in the maintenance operation.
- a stirring sequence comprising a second process, which is to be produced, is performed.
- the stirring flow path 99D includes a buffer tank 12, a degassing module 22, a supply pump 24, a supply side filter 26, a heat exchanger 28, a supply side back pressure tank 30, a drain valve 56, and the like. It is a flow path connecting the buffer tank 12 and the buffer tank 12. That is, the valve control unit 97 opens the drain valve 56 during the maintenance operation.
- the ink in the buffer tank 12 is the degassing module 22, the supply pump 24, the supply side filter 26, the heat exchanger 28, and the supply side back pressure tank. It is a flow returning to the buffer tank 12 via the 30 and the drain valve 56.
- the supply side filter 26 is arranged between the buffer tank 12 of the positive flow and the inkjet bar 14.
- the pump control unit 98 rotates the supply pump 24 in the positive direction and flows ink having an ink volume V1 at an ink volume velocity U1.
- the ink in the buffer tank 12 is the drain valve 56, the supply side back pressure tank 30, the heat exchanger 28, the supply side filter 26, and the supply pump 24. , And a flow returning to the buffer tank 12 via the degassing module 22.
- the filter is not arranged between the buffer tank 12 of the negative flow and the inkjet bar 14.
- the pump control unit 98 rotates the supply pump 24 in the negative direction to flow ink having an ink volume V2 at an ink volume velocity U2. Negative flow has a steady flow state for at least a certain period of time.
- the ink volume V1 and the ink volume V2 satisfy the relationship of V1> V2 as in the past. Further, it is desirable that the stirring sequence is performed not only once but multiple times. Further, it is preferable that the ink volume velocity U1 and the ink volume velocity U2 satisfy the relations of U1> U0 and U2> U0 with respect to the ink volume velocity U0 during normal operation.
- the ink flows in the drain flow path 54 in which the ink does not flow during normal operation. Since the drain flow path 54 has few opportunities for ink to flow during normal operation, the pigment is likely to settle, and the pigment can be prevented from settling by the stirring sequence. In addition, ink may be circulated as shown in FIG. 13 even during normal operation.
- FIG. 15 is an overall configuration diagram of the inkjet printing device 110 to which the ink supply device 10 is applied.
- the inkjet printing apparatus 110 is a printing machine that prints an image on a web-shaped paper 1 (an example of a printing substrate) by a single pass method.
- General-purpose printing paper is used as the paper 1.
- the general-purpose printing paper is not a so-called inkjet-only paper, but a paper mainly composed of cellulose such as coated paper used for general offset printing and the like.
- the inkjet printing apparatus 110 includes a transport unit 120, a feed unit 130, a pretreatment liquid coating unit 140, a printing unit 150, a drying unit 170, and a winding unit 180.
- the transport unit 120 transports the paper 1 from the feed unit 130 to the take-up unit 180 along the transport path.
- the transport unit 120 includes a plurality of pass rollers 122 that function as guide rollers.
- the delivery unit 130 includes a delivery roll 132.
- the feed roll 132 includes a rotatably supported reel (not shown). Paper 1 before the image is printed is wound on the reel in a roll shape.
- the take-up unit 180 includes a take-up roll 182.
- the take-up roll 182 includes a reel (not shown) that is rotatably supported. One end of the paper 1 is connected to the reel.
- the take-up roll 182 includes a take-up motor (not shown) for rotationally driving the reel.
- the paper 1 is conveyed by the transport unit 120 in a roll-to-roll manner along the transport path from the feed roll 132 to the take-up roll 182.
- the transport unit 120 functions as a moving mechanism for relatively moving the printing unit 150 and the paper 1.
- the pretreatment liquid application unit 140 is arranged on the upstream side of the transport path with respect to the printing unit 150.
- the pretreatment liquid application unit 140 applies the pretreatment liquid to the printed surface of the paper 1.
- the pretreatment liquid is a liquid containing water and a component that aggregates, insolubilizes, or thickens the coloring material component in the water-based ink, and thickens by reacting with the water-based ink.
- the pretreatment liquid coating unit 140 includes a coating roller 142, an opposing roller 144, and a pretreatment liquid drying unit 146.
- the paper 1 conveyed from the feeding unit 130 is guided by the pass roller 122 and conveyed to a position facing the coating roller 142.
- the coating roller 142 is rotated by a motor (not shown).
- a pretreatment liquid is supplied to the surface of the coating roller 142 from a coater (not shown), and then excess pretreatment liquid is scraped off by a blade (not shown).
- the coating roller 142 sandwiches the paper 1 with the facing roller 144, brings the surface to which the pretreatment liquid is supplied into contact with the printing surface of the paper 1, and the pretreatment liquid supplied to the surface is brought into contact with the printing surface of the paper 1. Apply to.
- the method of applying the pretreatment liquid to the printed surface of the paper 1 is not limited to the method of using the coating roller 142, and may be, for example, a method of using a liquid ejection head.
- the paper 1 coated with the pretreatment liquid is conveyed to the pretreatment liquid drying unit 146.
- the pretreatment liquid drying unit 146 includes a hot air heater (not shown). The pretreatment liquid drying unit 146 blows warm air from the warm air heater toward the printing surface of the paper 1 to dry the pretreatment liquid.
- the paper 1 on which the pretreatment liquid has been dried is guided by the pass roller 122 and conveyed to the printing unit 150.
- the printing unit 150 prints an image on the printing surface of the paper 1.
- the printing unit 150 includes a printing drum 152, an inkjet bar 14K, 14C, 14M, 14Y, 14W, an ink supply device 10K, 10C, 10M, 10Y, 10W, and a scanner 156.
- the paper 1 conveyed from the pretreatment liquid application unit 140 is guided by a plurality of pass rollers 122 and conveyed to the printing drum 152.
- the print drum 152 is rotated by a motor (not shown) to hold the paper 1 on the outer peripheral surface and convey it.
- the printing drum 152 has a plurality of suction holes (not shown) on the outer peripheral surface.
- the printing drum 152 sucks the paper 1 on the outer peripheral surface by sucking the suction holes by a pump (not shown).
- the paper 1 conveyed by the print drum 152 is conveyed to a position facing the inkjet bars 14K, 14C, 14M, 14Y, 14W.
- the inkjet bar 14 shown in FIG. 1 can be applied to the inkjet bars 14K, 14C, 14M, 14Y, and 14W, respectively.
- the inkjet bars 14K, 14C, 14M, 14Y, and 14W eject black (K), cyan (C), magenta (M), yellow (Y), and white (W) water-based inks, respectively.
- the water-based ink refers to an ink in which a coloring material such as a dye or a pigment is dissolved or dispersed in water and a solvent soluble in water.
- the water-based white ink contains a titanium oxide material as a pigment, and the average particle size of the titanium oxide material (an example of the diameter of dispersed particles) exceeds 100 nm.
- the average particle size is the particle size at an integrated value of 50% in the particle size distribution obtained by the laser diffraction / scattering method.
- the inkjet bars 14K, 14C, 14M, 14Y, and 14W are each composed of a line-type recording head that can be printed by one scan on the paper 1 conveyed by the printing drum 152.
- the inkjet bars 14K, 14C, 14M, 14Y, and 14W are each configured by connecting a plurality of head modules 15 in the X direction.
- the nozzle surfaces of the inkjet bars 14K, 14C, 14M, 14Y, and 14W are arranged so as to face the printing drum 152, respectively.
- the inkjet bars 14K, 14C, 14M, 14Y, and 14W are arranged at regular intervals along the transport path.
- the ink supply device 10 shown in FIG. 1 can be applied to the ink supply devices 10K, 10C, 10M, 10Y, and 10W, respectively.
- the ink supply devices 10K, 10C, 10M, 10Y, and 10W supply water-based inks of corresponding colors to the inkjet bars 14K, 14C, 14M, 14Y, and 14W, respectively.
- the scanner 156 includes an image pickup device that captures an image printed on the print surface of the paper 1 and converts it into an electric signal.
- a color CCD (Charge Coupled Device) linear image sensor can be used as the image pickup device.
- a color CMOS (Complementary Metal Oxide Semiconductor) linear image sensor can also be used instead of the color CCD linear image sensor.
- the printing unit 150 ejects droplets of water-based ink from at least one of the inkjet bars 14K, 14C, 14M, 14Y, and 14W toward the printing surface of the paper 1 conveyed by the printing drum 152.
- the ejected droplets of the water-based ink adhere to the paper 1, so that an image is printed on the printing surface of the paper 1.
- the scanning result is acquired by scanning the printed surface of the paper 1 conveyed by the printing drum 152 with the scanner 156.
- the drying unit 170 dries the ink on the printing surface of the paper 1.
- the drying unit 170 includes a drying drum 172.
- the paper 1 conveyed from the printing unit 150 is conveyed to the drying drum 172.
- the drying drum 172 is rotated by a motor (not shown) to hold and convey the paper 1 on the outer peripheral surface.
- the drying drum 172 has a plurality of suction holes (not shown) on the outer peripheral surface. The drying drum 172 sucks the paper 1 on the outer peripheral surface by sucking the suction holes by a pump (not shown).
- the drying unit 170 is provided with a hot air heater (not shown) around the drying drum 172.
- the drying unit 170 blows warm air from the hot air heater toward the printing surface of the paper 1 to dry the ink.
- the inkjet bars 14K, 14C, 14M, 14Y, and 14W have a structure in which the head modules 15 are connected in the X direction.
- 16 is a plan perspective view showing a structural example of the head module 15, and
- FIG. 17 is a sectional view taken along the line 17-17 of FIG.
- the head module 15 includes a nozzle plate 230 in which a nozzle 202, which is an ink droplet ejection port, is formed, and a flow path plate 232 in which an ink flow path is formed.
- the nozzle plate 230 and the flow path plate 232 are laminated and joined.
- the flow path plate 232 has a structure in which one or a plurality of substrates are laminated.
- the nozzle plate 230 and the flow path plate 232 can be processed into a required shape by a semiconductor manufacturing process using silicon as a material.
- the head module 15 is provided with a plurality of nozzles 202 on the nozzle surface 200 which is the bottom surface. Further, a plurality of ink chamber units 206 including pressure chambers 204 and the like provided corresponding to each nozzle 202 are two-dimensionally arranged in a fixed arrangement pattern. As a result, a substantially high density of nozzle spacing is achieved, which is projected so as to line up along the X direction.
- the pressure chamber 204 communicates with the supply tributary 210 via the supply throttle 208, and each supply tributary 210 communicates with the common flow path 212. Further, the descender 214 communicating with each pressure chamber 204 is communicated with the circulation common flow path 220 via the ink circulation path 216 and the recovery tributary 218.
- the head module 15 is provided with an ink supply port 15A and an ink discharge port 15B, the ink supply port 15A communicates with the common flow path 212, and the ink discharge port 15B communicates with the circulation common flow path 220.
- the ink supply port 15A and the ink discharge port 15B of the head module 15 have a common flow path 212, a supply tributary 210, a supply throttle 208, a pressure chamber 204, a descender 214, an ink circulation path 216, a recovery tributary 218, and circulation. It is configured to be communicated via a common flow path 220.
- the ink supplied to the ink supply port 15A flows through the common flow path 212, the supply tributary 210, the supply throttle 208, the pressure chamber 204, and the descender 214, and a part of the ink is discharged from each nozzle 202, and the remaining ink is discharged.
- the ink is discharged from the ink discharge port 15B via the ink circulation path 216, the recovery tributary 218, and the circulation common flow path 220.
- the ink circulation path 216 is preferably configured to be provided around the nozzle 202.
- the ink circulation path 216 is provided in a region communicating with the descender 214 and in contact with the nozzle plate 230 of the flow path plate 232. As a result, the ink circulates in the vicinity of the nozzle 202, so that ink thickening inside the nozzle 202 is prevented and stable ejection is possible.
- an actuator 228 having an individual electrode is joined to the diaphragm 226 which constitutes the top surface of the pressure chamber 204 and is also used as a common electrode.
- the actuator 228 is deformed in the direction of contracting the pressure chamber 204.
- ink is ejected from the nozzle 202.
- the actuator 228 is deformed in the direction of expanding the pressure chamber 204.
- new ink is supplied to the pressure chamber 204 from the common flow path 212 through the supply tributary 210 and the supply throttle 208.
- the actuator 228 is applied as a means for generating the ink ejection force to be ejected from the nozzle 202, but a thermal method is provided in which a heater is provided in the pressure chamber 204 and the ink is ejected by using the pressure of the film boiling due to the heating of the heater. It is also possible to apply.
- the arrangement structure of the nozzle 202 is not limited to the illustrated example, and various nozzle arrangement structures such as an arrangement structure having one row of nozzles in the X direction can be applied.
- FIG. 18 is a block diagram showing a configuration of a control system of the inkjet printing apparatus 110.
- the inkjet printing device 110 includes a transfer control unit 250, a pretreatment liquid application control unit 252, a print control unit 254, a drying control unit 256, a general control unit 258, and a user interface 264.
- the transport control unit 250 rotates the take-up roll 182 by a motor (not shown) to unwind the paper 1 from the feed roll 132.
- the transport unit 120 guides the paper 1 by a plurality of pass rollers 122, and the take-up unit 180 winds the printed paper 1 on the take-up roll 182.
- the paper 1 is conveyed to the feeding unit 130, the pretreatment liquid application unit 140, the printing unit 150, the drying unit 170, and the winding unit 180.
- the transport control unit 250 controls a pump (not shown) to attract the paper 1 to the outer peripheral surface of the printing drum 152.
- the transport control unit 250 rotates the print drum 152 by a motor (not shown). Further, the transfer control unit 250 acquires an encoder value from a rotary encoder (not shown) arranged on the print drum 152.
- the transport control unit 250 controls a pump (not shown) to attract the paper 1 to the outer peripheral surface of the drying drum 172.
- the transport control unit 250 rotates the drying drum 172 by a motor (not shown).
- the pretreatment liquid application control unit 252 applies the pretreatment liquid to the printed surface of the paper 1 by the coating roller 142. Further, the pretreatment liquid application control unit 252 dries the pretreatment liquid applied to the printed surface of the paper 1 by a warm air heater (not shown) of the pretreatment liquid drying unit 146.
- the print control unit 254 includes a bulb control unit 97 and a pump control unit 98, and controls the operation of the ink supply device 10 in an integrated manner.
- the print control unit 254 controls the ejection of ink by the inkjet bars 14K, 14C, 14M, 14Y, and 14W based on the print data.
- the print control unit 254 uses the inkjet bars 14K, 14C, 14M, 14Y, and 14W to generate black, cyan, magenta, yellow, and white ink droplets in synchronization with the encoder value acquired via the transfer control unit 250, respectively. It is ejected toward the paper 1. As a result, a color image is printed on the printed surface of the paper 1, and the paper 1 becomes a "printed matter".
- the integrated control unit 258 normally operates the ink supply device 10 during printing when an image is printed on the paper 1 at the inkjet bars 14K, 14C, 14M, 14Y, and 14W, and operates the maintenance operation during non-printing other than printing. ..
- the overall control unit 258 implements the stirring sequence of the ink supply devices 10K, 10C, 10M, 10Y, and 10W in the start-up process at the start of the inkjet printing device 110. Further, it is desirable that the integrated control unit 258 periodically performs a stirring sequence of the ink supply devices 10K, 10C, 10M, 10Y, and 10W, for example, every 3 hours after the power of the inkjet printing device 110 is cut off.
- the ink supply device 10 is applied to each of the water-based inks of black, cyan, magenta, yellow, and white, but it is particularly important to apply the ink supply device 10 to the water-based white ink.
- the water-based white ink contains a titanium oxide material having an average particle size of more than 100 nm, and the titanium oxide material tends to settle. Therefore, by applying the ink supply device 10 to the water-based white ink, the contaminated water-based white ink does not adversely affect the ejection and can effectively prevent sedimentation.
- the print control unit 254 causes the scanner 156 to read the image printed on the paper 1 in synchronization with the encoder value acquired via the transport control unit 250, and acquires the reading result.
- the inkjet printing device 110 may acquire information on the location of the nozzle 202 with defective ejection by forming a detection pattern by the print control unit 254 and analyzing the reading result read by the scanner 156.
- the print control unit 254 may output information on the location of the nozzle 202 having a defective ejection to the integrated control unit 258.
- the print control unit 254 may have a compensation function of correcting the print data and compensating for the print area of the nozzle 202 with ejection failure. As an example, there is a compensation function for compensating for a nozzle 202 having a defective ejection by increasing the volume of ink droplets of a plurality of adjacent nozzles 202. The print control unit 254 outputs information on the portion compensated by the compensation function of the printed matter to the integrated control unit 258.
- the drying control unit 256 controls the heating by a hot air heater (not shown), and the drying unit 170 dries the paper 1.
- the integrated control unit 258 collectively controls the operation of the inkjet printing device 110 by controlling the transfer control unit 250, the pretreatment liquid application control unit 252, the print control unit 254, and the drying control unit 256, respectively.
- the integrated control unit 258 includes a processor 260 and a memory 262.
- the integrated control unit 258 includes the integrated control unit 94 (see FIG. 2).
- the processor 260 may be the processor 95.
- the memory 262 may be the memory 96.
- the user interface 264 includes an input unit (not shown) for the user to operate the inkjet printing device 110, and a display unit (not shown) for presenting information to the user.
- the input unit is, for example, an operation panel that receives input from a user.
- the display unit is, for example, a display that displays image data and various types of information. The user can have the inkjet printing device 110 print a desired image by using the user interface 264.
- the ink supply device 10 is applied as the ink supply devices 10K, 10C, 10M, 10Y, and 10W
- the inkjet bars 14K, 14C, 14M, 14Y, and 14W circulate the ink to the head module 15.
- the ink supply device 100 may be applied as the ink supply device 10K, 10C, 10M, 10Y, and 10W, respectively.
- Supply side head manifold 34 ...
- Supply side pressure sensor 36 ...
- Supply valve 36 (36-1 to 36-n) ...
- Supply valve 38 (38-1 to 38-n) ...
- Supply damper 40 (40-1 to 40-n) ...
- Recovery damper 42 (42-1 to 42-n) ...
- Recovery valve 44 ...
- Recovery side head manifold 46 ...
- Recovery side pressure sensor 48 ...
- Air flow path communication port 50 ... Recovery pump 52 ... Recovery flow path valve 54 ... Drain flow path 56 ... Drain valve 58 ... Air flow path 59 ... Air connect valve 60 ...
- Air tank 61 ... Atmospheric communication passage 62 ... Air valve 64 ... First Bypass flow path 66 ... Second bypass flow path 68 ... First bypass flow path valve 69 ... Second bypass flow path valve 70 ... Drain valve 71 ... Air flow path 72 ... Air connect valve 73 ... Air tank 74 ... Atmospheric connection Passage 75 ... Air valve 76 ... Ink main tank 76A ... Main tank filter 78 ... Replenishment flow path 80 ... Overflow flow path 82 ... Replenishment pump 84 ... First safety valve 86 ... Second safety valve 88 ... Third safety valve 90 ... Recovery Side filter 92 ... Recovery side filter valve 94 ... General control unit 95 ... Processor 96 ...
Landscapes
- Ink Jet (AREA)
Abstract
Description
図1は、インク供給装置10(液体供給装置の一例)の全体構成を示す図である。インク供給装置10は、バッファタンク12からインクジェットバー14にインクを供給する装置であり、図1に示すように、供給流路16、及び回収流路18を備える。
図4及び図5は、インク供給装置10の第1の実施形態に係るメンテナンス動作におけるインクの流れを示す図である。
図9及び図10は、インク供給装置10の第2の実施形態に係るメンテナンス動作におけるインクの流れを示す図である。インク供給装置10は、少なくともメンテナンス動作において、循環流路20の少なくとも一部を含む撹拌流路99B(第1の流路の一例)内のインクに正流れを生成させる第1の処理、及び撹拌流路99B内のインクに負流れを生成させる第2の処理、を含む撹拌シーケンスを実施する。
図11及び図12は、インク供給装置10の第3の実施形態に係るメンテナンス動作におけるインクの流れを示す図である。インク供給装置10は、少なくともメンテナンス動作において、循環流路20の少なくとも一部を含む撹拌流路99C(第1の流路の一例)内のインクに正流れを生成させる第1の処理、及び撹拌流路99C内のインクに負流れを生成させる第2の処理、を含む撹拌シーケンスを実施する。
図13及び図14は、インク供給装置100(液体供給装置の一例)の全体構成及びメンテナンス動作におけるインクの流れを示す図である。なお、図1に示したインク供給装置10と共通する部分には同一の符号を付し、その詳細な説明は省略する。
図15は、インク供給装置10を適用したインクジェット印刷装置110の全体構成図である。インクジェット印刷装置110は、ウェブ状の用紙1(印刷基材の一例)にシングルパス方式で画像を印刷する印刷機である。用紙1には汎用の印刷用紙が使用される。汎用の印刷用紙とは、いわゆるインクジェット専用紙ではなく、一般のオフセット印刷等に用いられる塗工紙等のセルロースを主体とした用紙をいう。
搬送部120は、送り出し部130から巻取り部180まで、用紙1を搬送経路に沿って搬送する。搬送部120は、ガイドローラとして機能する複数のパスローラ122を備える。
前処理液塗布部140は、印字部150よりも搬送経路の上流側に配置される。前処理液塗布部140は、用紙1の印刷面に前処理液を塗布する。前処理液は、水性インク中の色材成分を凝集、又は不溶化、又は増粘させる成分と水とを含む液体であり、水性インクと反応することで増粘する。
印字部150は、用紙1の印刷面に画像を印刷する。印字部150は、印字ドラム152、インクジェットバー14K、14C、14M、14Y、14W、インク供給装置10K、10C、10M、10Y、10W、及びスキャナ156を備える。
乾燥部170は、用紙1の印刷面のインクを乾燥させる。乾燥部170は、乾燥ドラム172を備える。
インクジェットバー14K、14C、14M、14Y、14Wは、ヘッドモジュール15がX方向につなぎ合わせられた構造を有する。図16は、ヘッドモジュール15の構造例を示す平面透視図であり、図17は、図16の17-17断面図である。
図18は、インクジェット印刷装置110の制御系の構成を示すブロック図である。インクジェット印刷装置110は、搬送制御部250、前処理液塗布制御部252、印字制御部254、乾燥制御部256、統括制御部258、及びユーザインターフェース264を備える。
本発明の技術的範囲は、上記の実施形態に記載の範囲には限定されない。各実施形態における構成等は、本発明の趣旨を逸脱しない範囲で、各実施形態間で適宜組み合わせることができる。
10、10C、10K、10M、10W、10Y…インク供給装置
12…バッファタンク
14、14C、14K、14M、14W、14Y…インクジェットバー
15(15-1~15-n)…ヘッドモジュール
15A…インク供給口
15B…インク排出口
16…供給流路
18…回収流路
20…循環流路
22…脱気モジュール
24…供給ポンプ
26…供給側フィルター
28…熱交換器
30…供給側背圧タンク
30A…インク流入口
30B…インク流出口
30C…液室
30D…気室
30E…弾性膜
30F…気泡排出口
30G…エア流路連通口
32…供給側ヘッドマニホールド
34…供給側圧力センサ
36…供給バルブ
36(36-1~36-n)…供給バルブ
38(38-1~38-n)…供給ダンパ
40(40-1~40-n)…回収ダンパ
42(42-1~42-n)…回収バルブ
44…回収側ヘッドマニホールド
46…回収側圧力センサ
48…回収側背圧タンク
48A…インク流入口
48B…インク流出口
48C…液室
48D…気室
48E…弾性膜
48F…気泡排出口
48G…エア流路連通口
50…回収ポンプ
52…回収流路バルブ
54…ドレイン流路
56…ドレインバルブ
58…エア流路
59…エアコネクトバルブ
60…エアタンク
61…大気連通路
62…エアバルブ
64…第1のバイパス流路
66…第2のバイパス流路
68…第1のバイパス流路バルブ
69…第2のバイパス流路バルブ
70…ドレインバルブ
71…エア流路
72…エアコネクトバルブ
73…エアタンク
74…大気連通路
75…エアバルブ
76…インクメインタンク
76A…メインタンク用フィルター
78…補充流路
80…オーバーフロー流路
82…補充ポンプ
84…第1の安全弁
86…第2の安全弁
88…第3の安全弁
90…回収側フィルター
92…回収側フィルターバルブ
94…統括制御部
95…プロセッサ
96…メモリ
97…バルブ制御部
98…ポンプ制御部
99A…撹拌流路
99B…撹拌流路
99C…撹拌流路
99D…撹拌流路
102…インクジェットバー
110…インクジェット印刷装置
120…搬送部
122…パスローラ
130…出し部
132…送り出しロール
140…前処理液塗布部
142…塗布ローラ
144…対向ローラ
146…前処理液乾燥部
150…印字部
152…印字ドラム
156…スキャナ
170…乾燥部
172…乾燥ドラム
180…巻取り部
182…巻取りロール
200…ノズル面
202…ノズル
204…圧力室
206…インク室ユニット
210…供給支流
212…共通流路
214…ディセンダー
216…インク循環路
218…回収支流
220…循環共通流路
226…振動板
228…アクチュエータ
230…ノズルプレート
232…流路板
250…搬送制御部
252…前処理液塗布制御部
254…印字制御部
256…乾燥制御部
258…統括制御部
260…プロセッサ
262…メモリ
264…ユーザインターフェース
F…継手
S1~S5…インク供給装置の制御方法の各ステップ
Claims (14)
- 液体を貯留する液体タンクから液体吐出ヘッドに前記液体を供給し、かつ前記液体吐出ヘッドから液体タンクに前記液体を回収する循環流路と、
前記循環流路に設けられ、前記循環流路内の前記液体に流れを生成させるポンプと、
プロセッサに実行させるための命令を記憶するメモリと、
メモリに記憶された命令を実行するプロセッサと、
を備え、
前記プロセッサは、
前記ポンプを制御することで、前記循環流路の少なくとも一部を含む第1の流路内の前記液体に第1の方向の正流れを生成させる第1の処理、及び前記第1の流路内の前記液体に前記第1の方向とは反対方向の負流れを生成させる第2の処理、を含むシーケンスを実施し、
前記第1の流路は、前記正流れの前記液体タンクから前記液体吐出ヘッドまでの間に前記液体内の異物を除去するフィルターが配置され、
前記正流れの前記液体の流量は前記負流れの前記液体の流量より大きく、
前記負流れは定常流の状態を有する、
液体供給装置。 - 前記第1の流路は、前記負流れの前記液体タンクから液体吐出ヘッドまでの間に前記液体内の異物を除去するフィルターが非配置である、
請求項1に記載の液体供給装置。 - 前記プロセッサは、前記シーケンスを複数回実施する、
請求項1又は2に記載の液体供給装置。 - 前記第1の流路は、前記循環流路とは異なる第2の流路を含む、
請求項1から3のいずれか1項に記載の液体供給装置。 - 前記負流れの前記液体の流量は、前記第2の流路の体積より小さい、
請求項4に記載の液体供給装置。 - 前記プロセッサは、前記シーケンスを実施する前に、前記ポンプを制御することで、前記第2の流路内の前記液体を前記フィルターによって前記異物が除去された前記液体に置き換える、
請求項4又は5に記載の液体供給装置。 - 前記プロセッサは、前記シーケンスを実施した後に、前記ポンプを制御することで、前記第1の流路のうち負流れの液体が流れた全ての流路内の前記液体を前記フィルターによって前記異物が除去された前記液体に置き換える、
請求項4から6のいずれか1項に記載の液体供給装置。 - 液体を貯留する液体タンクと、
吐出口から前記液体を吐出する液体吐出ヘッドと、
前記液体吐出ヘッドと印刷基材とを相対的に移動させる移動機構と、
請求項1から7のいずれか1項に記載の液体供給装置と、
を備え、
前記プロセッサは、
前記液体吐出ヘッドと前記印刷基材とを相対的に移動させながら前記液体吐出ヘッドの前記吐出口から前記液体を吐出させて前記印刷基材に画像を印刷させ、
前記印刷時に、前記循環流路に前記液体を循環させ、
前記印刷時以外の非印刷時に、前記シーケンスを実施する、
印刷装置。 - 前記正流れの体積速度は、前記印刷時における体積速度よりも少なくとも一時的に大きい、
請求項8に記載の印刷装置。 - 前記負流れの体積速度は、前記印刷時における体積速度よりも少なくとも一時的に大きい、
請求項8又は9に記載の印刷装置。 - 前記液体は、分散している粒子の直径が100nmを超える、
請求項8から10のいずれか1項に記載の印刷装置。 - 前記液体は、酸化チタン材料を含むホワイトインクである、
請求項8から11のいずれか1項に記載の印刷装置。 - 前記循環流路は、前記循環流路のうちの一部の流路を開閉するバルブを備え、
前記プロセッサは、前記バルブを制御して前記第1の流路を決定する、
請求項8から12のいずれか1項に記載の印刷装置。 - 液体を貯留する液体タンクから液体吐出ヘッドに前記液体を供給し、かつ前記液体吐出ヘッドから液体タンクに前記液体を回収する循環流路と、前記循環流路に設けられ、前記循環流路内の前記液体に流れを生成させるポンプと、を備える液体供給装置の制御方法であって、
前記ポンプを制御することで、前記循環流路の少なくとも一部を含む第1の流路内の前記液体に第1の方向の正流れを生成させる第1の処理、及び前記第1の流路内の前記液体に前記第1の方向とは反対方向の負流れを生成させる第2の処理、を含むシーケンスを実施し、
前記第1の流路は、前記正流れの前記液体タンクから前記液体吐出ヘッドまでの間に前記液体内の異物を除去するフィルターが配置され、
前記正流れの前記液体の流量は前記負流れの前記液体の流量より大きく、
前記負流れは定常流の状態を有する、
液体供給装置の制御方法。
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