WO2015125542A1 - インクジェット記録装置 - Google Patents
インクジェット記録装置 Download PDFInfo
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- WO2015125542A1 WO2015125542A1 PCT/JP2015/051527 JP2015051527W WO2015125542A1 WO 2015125542 A1 WO2015125542 A1 WO 2015125542A1 JP 2015051527 W JP2015051527 W JP 2015051527W WO 2015125542 A1 WO2015125542 A1 WO 2015125542A1
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- ink
- flow path
- unit
- recording apparatus
- circulation
- Prior art date
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Classifications
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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
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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
- B41J2/19—Ink jet characterised by ink handling for removing air bubbles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17596—Ink pumps, ink valves
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- 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
- This invention relates to an ink jet recording apparatus.
- ink jet recording apparatus that forms an image on a recording medium by ejecting ink from nozzles.
- ink is ejected from the nozzle end by pressurizing liquid ink.
- Patent Document 1 is provided with a deaeration device connected by a three-way valve in parallel to a sub tank in the ink flow path from the ink tank to the nozzle, and sends the ink flowing out from the sub tank to the deaeration device for deaeration.
- a technique for switching the three-way valve after repeating the process of returning to the sub tank after the desired number of times and supplying ink from the sub tank to the nozzles is described.
- Patent Document 2 describes a configuration in which a deaeration device is provided in a circulation flow path attached to a sub tank, and the deaeration is repeated by sending ink in the sub tank to the deaeration device a plurality of times.
- Patent Document 3 describes a technique for increasing the efficiency of deaeration by providing a return channel for flowing ink a plurality of times in an ink channel in which a deaeration device and a sub tank are arranged in series. .
- the conventional technology requires time until the degree of ink deaeration in the sub tank rises to a predetermined level.
- image formation by the ink jet recording apparatus must be interrupted.
- the deaerator since the deaerator has a certain vacuum state inside, the thermal conductivity to the ink in the deaerator is poor, and it takes time to increase the temperature of the ink by heating.
- circulating the ink in the deaerator is effective for efficient ink heating, but if there is a sub tank in the middle of the circulation path, the effect on the heating is reduced, and the ink is heated. In particular, there is a problem that it takes time to start up the apparatus.
- An object of the present invention is to provide an ink jet recording apparatus capable of stably supplying ink to nozzles while ensuring a desired degree of deaeration with an easy configuration and operation.
- the invention according to claim 1
- An ink tank for storing ink;
- a recording head for ejecting ink to form an image;
- An ink flow path for supplying ink from the ink tank to the recording head;
- a deaeration device provided in the middle of the ink flow path to remove air from the ink;
- a circulation flow path having both ends connected to both sides of the deaeration device in the ink flow path;
- a circulation pump which is provided in the middle of the circulation flow path and returns the ink flowing out from the deaeration device to a position where the ink flows into the deaeration device;
- the ink channel is formed between the outlet from the circulation channel and the inlet to the circulation channel, and the circulation channel is formed so that ink can move at a substantially constant speed.
- Inkjet recording apparatus With the ink channel is formed between the outlet from the circulation channel and the inlet to the circulation channel, and the circulation channel is formed so that ink can move at a substantially constant speed.
- the invention described in claim 2 is the ink jet recording apparatus according to claim 1,
- the deaerator is provided with a heating unit.
- the invention described in claim 3 is the ink jet recording apparatus according to claim 2,
- the ink is a gel-like ink that is solated by heating to a predetermined temperature or higher.
- the flow rate of the circulation pump is not more than the maximum flow rate of the ink flow path.
- the invention according to claim 5 is the ink jet recording apparatus according to any one of claims 1 to 4, A control unit for controlling the operation of the circulation pump;
- the control unit is characterized in that when the ink flow rate to the recording head is equal to or less than a predetermined value, the circulation pump is operated to circulate the ink in the ink flow path.
- the invention according to claim 6 is the ink jet recording apparatus according to claim 5,
- the control unit operates the circulation pump when ink is not supplied to the recording head.
- the invention according to claim 7 is the ink jet recording apparatus according to any one of claims 1 to 4, A control unit for controlling the operation of the circulation pump; The control unit switches whether the circulation pump is operable according to the presence / absence of an ink discharge command related to image formation.
- the invention according to claim 8 is the ink jet recording apparatus according to any one of claims 1 to 7, A first storage section is provided between the inlet of the circulation flow path and the recording head.
- the invention according to claim 9 is the inkjet recording apparatus according to any one of claims 1 to 8, A second reservoir is provided between the ink tank and the outlet of the circulation channel, A recovery flow path for returning the ink of the recording head to the second storage section is provided.
- an ink jet recording apparatus it is possible to stably supply ink to the nozzle while ensuring a desired degree of deaeration with an easy configuration and operation, and to reduce the heating of the ink when the apparatus is started up. There is an effect that it can be done in time.
- FIG. 1 is a schematic diagram illustrating an overall configuration of an ink jet recording apparatus according to an embodiment of the present invention. It is a perspective view of an ink supply part. It is a figure which shows the example of the change of the viscosity of the ink accompanying the temperature rise and fall of an ink. It is a figure explaining the flow path of an ink. It is sectional drawing of a deaeration chamber. It is the figure which expanded and showed the structure of the ink flow path. It is a block diagram which shows the internal structure of an inkjet recording device. It is a figure which shows the modification 1 of a structure of an ink flow path. It is a figure which shows the modification 2 of the structure of an ink flow path.
- FIG. 1 is a schematic diagram showing an overall configuration of an inkjet recording apparatus 1 according to an embodiment of the present invention.
- the inkjet recording apparatus 1 includes a paper feeding unit 10, an image forming unit 20, a paper discharge unit 30, a control unit 40 (see FIG. 7), an ink supply unit 50, and the like.
- the image forming unit 20 uses the ink supplied from the ink supply unit 50 to the recording medium P conveyed from the paper supply unit 10 to the image forming unit 20 based on the control of the control unit 40. After the image is formed, the recording medium P is discharged to the paper discharge unit 30.
- the paper feeding unit 10 holds the recording medium P on which image formation is performed and supplies the recording medium P to the image forming unit 20 before image formation.
- the paper feed unit 10 includes a paper feed tray 11 and a transport unit 12.
- the paper feed tray 11 is a plate-like member provided so that one or a plurality of recording media P can be placed thereon.
- the paper feed tray 11 is provided so as to move up and down according to the amount of the recording medium P placed thereon, and is held at a position where the uppermost recording medium P is transported by the transport unit 12.
- the conveyance unit 12 is mounted on the sheet feeding tray 11 and a conveyance mechanism that conveys the recording medium P on the belt 123 by rotationally driving a ring-shaped belt 123 by a plurality of (for example, two) rollers 121 and 122.
- a supply unit for transferring the uppermost recording medium P to the belt 123 is provided.
- the transport unit 12 transports the recording medium P delivered to the belt 123 by the supply unit as the belt 123 rotates.
- the image forming unit 20 forms an image by ejecting ink onto the recording medium P.
- the image forming unit 20 includes an image forming drum 21, a delivery unit 22, a paper heating unit 23, a head unit 24, an irradiation unit 25, a delivery unit 26, and the like.
- the image forming drum 21 carries the recording medium P along the cylindrical outer peripheral surface, and conveys the recording medium P as it rotates.
- the conveyance surface of the image forming drum 21 faces the paper heating unit 23, the head unit 24, and the irradiation unit 25, and performs processing related to image formation on the conveyed recording medium P.
- the delivery unit 22 is provided at a position between the transport unit 12 of the paper feed unit 10 and the image forming drum 21, and delivers the recording medium P transported by the transport unit 12 to the image forming drum 21.
- the delivery unit 22 is a swing arm unit 221 that supports one end of the recording medium P conveyed by the conveyance unit 12, and a cylindrical delivery drum that delivers the recording medium P carried on the swing arm unit 221 to the image forming drum 21.
- the recording medium P on the transport unit 12 is picked up by the swing arm unit 221 and transferred to the transfer drum 222 to guide the recording medium P in the direction along the outer peripheral surface of the image forming drum 21 to form an image. Delivered to drum 21.
- the paper heating unit 23 heats the recording medium P carried on the image forming drum 21.
- the sheet heating unit 23 includes, for example, an infrared heater and generates heat in response to energization.
- the sheet heating unit 23 is provided in the vicinity of the outer peripheral surface of the image forming drum 21 and on the upstream side of the head unit 24 in the conveyance direction of the recording medium P by the rotation of the image forming drum 21. Heat generation of the sheet heating unit 23 is controlled by the control unit 40 so that the recording medium P carried on the image forming drum 21 and passing through the vicinity of the sheet heating unit 23 has a predetermined temperature.
- the head unit 24 discharges ink to the recording medium P carried on the image forming drum 21 to form an image.
- the head unit 24 is provided for each color of C (cyan), M (magenta), Y (yellow), and K (black).
- head units 24 corresponding to the colors Y, M, C, and K are provided in order from the upstream with respect to the conveyance direction of the recording medium P that is conveyed along with the rotation of the image forming drum 21.
- the head unit 24 of this embodiment is provided with a length (width) that covers the entire recording medium P in a direction (width direction) perpendicular to the conveyance direction of the recording medium P. That is, the ink jet recording apparatus 1 is a one-pass line head type ink jet recording apparatus.
- the head unit 24 can constitute a line head by arranging a plurality of recording heads 24a.
- the irradiation unit 25 irradiates an energy ray for curing the ink after the ink used in the inkjet recording apparatus 1 of the present embodiment is ejected onto the recording medium P.
- the irradiation unit 25 includes, for example, a fluorescent tube such as a low-pressure mercury lamp, and emits energy rays such as ultraviolet rays by causing the fluorescent tube to emit light.
- the irradiation unit 25 is provided in the vicinity of the outer peripheral surface of the image forming drum 21 and on the downstream side of the head unit 24 in the conveyance direction of the recording medium P by the rotation of the image forming drum 21.
- the irradiation unit 25 irradiates the recording medium P carried on the image forming drum 21 and ejects the ink with energy rays, and cures the ink ejected onto the recording medium P by the action of the energy rays.
- Fluorescent tubes emitting ultraviolet rays include low-pressure mercury lamps, mercury lamps having an operating pressure of several hundred Pa to 1 MPa, light sources usable as germicidal lamps, cold cathode tubes, ultraviolet laser light sources, metal halide lamps, light-emitting diodes, etc. Is mentioned.
- a light source for example, a light emitting diode
- the energy rays are not limited to ultraviolet rays, but may be any energy rays having a property of curing the ink according to the properties of the ink, and the light source is replaced according to the wavelength of the energy rays.
- the delivery unit 26 conveys the recording medium P irradiated with the energy rays from the irradiation unit 25 from the image forming drum 21 to the paper discharge unit 30.
- the delivery unit 26 rotates the annular belt 263 by a plurality of (for example, two) rollers 261 and 262 and conveys the recording medium P on the belt 263, and the recording medium P from the image forming drum 21.
- a cylindrical delivery drum 264 and the like are provided to the transport mechanism.
- the delivery unit 26 conveys the recording medium P transferred to the belt 263 by the transfer drum 264 by the belt 263 and sends it to the paper discharge unit 30.
- the paper discharge unit 30 stores the recording medium P sent out from the image forming unit 20 by the delivery unit 26.
- the paper discharge unit 30 includes a plate-shaped paper discharge tray 31 and the like, and the recording medium P after image formation is placed on the paper discharge tray 31.
- the control unit 40 controls the operation of each unit of the inkjet recording apparatus 1 and controls the overall operation.
- the control unit 40 includes a CPU (Central Processing Unit) 401, a ROM (Read Only Memory) 402, a RAM (Random Access Memory) 403, etc. (see FIG. 7).
- the program read from the ROM 402 by the CPU 401 is executed on the RAM 403, and various control processes are executed.
- the ink supply unit 50 stores ink, supplies the ink to the head unit 24 of the image forming unit 20, and enables ink of each color to be ejected from the nozzles of the head unit 24.
- FIG. 2 is a perspective view of the ink supply unit 50.
- the ink supply unit 50 includes an ink tank 51, a weight sensor 52, a supply pump 53, a supply pipe 54, a housing 55, and the like.
- the ink tank 51 is a container for storing each color ink used for image formation. Ink pumped from the ink tank 51 by the supply pump 53 is sent to the head unit 24. For example, 20 liters of ink can be stored in the ink tank 51.
- the ink tank 51 can be additionally replenished with ink from a removable ink pack 60 via a supply pipe 54.
- the ink used in the inkjet recording apparatus 1 of the present embodiment is not particularly limited, but is, for example, an ultraviolet (UV) curable ink.
- This UV curable ink is a gel-like ink that changes in phase between a gel state and a liquid (sol) state in accordance with temperature when UV is not irradiated.
- the ink has a predetermined temperature, for example, a phase change temperature of about 40 ° C. to 100 ° C., and is uniformly liquefied (solified) by being heated to a temperature higher than the phase change temperature.
- the ink gels below the predetermined temperature including the normal room temperature (0 to 30 degrees).
- FIG. 3 shows an example of the change in the viscosity of the ink as the ink temperature rises and falls.
- a broken line L1 indicates an example of change in the viscosity of the ink when the temperature rises
- a solid line L2 indicates an example of the change in the viscosity of the ink when the temperature decreases.
- This ink undergoes a phase change between a gel state having a viscosity of 100 mPa ⁇ s or higher and a liquid (sol) state having a viscosity of less than 100 mPa ⁇ s (mainly less than 10 mPa ⁇ s).
- the ink viscosity change curve when the temperature rises (broken line L1) is different from the ink viscosity change curve when the temperature drops (solid line L2).
- the ink viscosity is less than 100 mPa ⁇ s when the ink temperature is 60 ° C. or higher.
- the ink viscosity exceeds 100 mPa ⁇ s when the ink temperature falls below 45 ° C. That is, in this ink example, when the temperature of the ink is 60 ° C. (T1: first temperature) or higher, the viscosity becomes less than 100 mPa ⁇ s and becomes liquid, regardless of the temperature rise or fall, and 45 ° C. ( When the temperature is lower than (T2: second temperature), the viscosity exceeds 100 mPa ⁇ s and becomes a gel, regardless of the temperature rise or fall.
- T1 first temperature
- T2 second temperature
- the weight sensor 52 is provided below the ink tank 51.
- the weight sensor 52 measures the weight of the ink tank 51 and digitally converts it at a predetermined sampling rate, and then outputs the measured value data to the control unit 40.
- the supply pump 53 draws ink from the ink tank 51 and sends it to the image forming unit 20.
- the ink pumped out from the supply pump 53 is a mixture of components in a gel state, and has sufficient lift to pump out the gel ink.
- the supply pipe 54 is an inlet for filling ink in the ink tank 51. Normally, the upper portion of the supply tube 54 can be closed with a lid or the like, and when the ink is replenished, the lid member is removed and the external ink pack 60 is stably placed on the upper portion. It can be attached. Alternatively, a structure in which the supply pipe 54 opens and closes according to the attachment / detachment of the ink pack 60 without separately providing a lid member may be employed.
- the housing 55 fixes and holds each part of the ink supply unit 50.
- the housing 55 has a plurality of wheels and support legs that can be expanded and contracted or moved up and down at the lower part thereof, and the length of the support legs is adjusted as necessary, and the casing 55 can be moved by the wheels or predetermined by the support legs. It can be fixedly arranged at the position.
- FIG. 4 is a diagram illustrating the ink flow path in the inkjet recording apparatus 1 of the present embodiment.
- the ink pumped from the ink tank 51 of the ink supply unit 50 by the supply pump 53 is supplied to each recording head 24a via the ink flow path 24b. Further, the ink that has not been ejected by each recording head 24a can be returned to the ink flow path 24b.
- a second sub tank 241 second reservoir
- a deaeration module 242 liquid feed pump 243
- a check valve 244 check valve 244
- a first sub tank 245 first reservoir
- a circulation pump 246 is provided in parallel with the deaeration module 242, and the ink flowing out from the deaeration module 242 is allowed to flow through the deaeration module 242 via the circulation flow path 24 c connected to both ends of the deaeration module 242. It is possible to return to the front of the entrance.
- the ink flows at a substantially constant speed according to the flow rate of the liquid feed pump 243 and the circulation pump 246 until the branch point to the inlet to 24c and in the circulation flow path 24c.
- substantially constant speed indicates that the speed is within a speed range that can be regarded as constant on average while taking into consideration the influence of fluctuations (pulsations) in the flow rate of the liquid feed pump 243 and the circulation pump 246. .
- the recording head 24a, the ink flow path 24b, and the circulation flow path 24c are heated and kept warm by an ink heating unit 270 such as a heater or a heat transfer member that transfers heat from the heater, so that the ink temperature is maintained at an appropriate temperature. It is supposed to be.
- an ink heating unit 270 such as a heater or a heat transfer member that transfers heat from the heater, so that the ink temperature is maintained at an appropriate temperature.
- a heating wire is used, and when energized, Joule heat is generated.
- the heat transfer member a member having high thermal conductivity, for example, a heat conductive plate formed of various metals (alloys) is used, and covers the ink flow path 24b and the circulation flow path 24c, or the second sub tank 241. Or in contact with the side wall of the first sub tank 245.
- the deaeration module 242 includes a check valve 247, a trap 248, a vacuum pump 249, and the like connected in series to constitute a deaeration device.
- FIG. 5 is an enlarged view of the configuration of the ink flow path in the inkjet recording apparatus 1 of the present embodiment.
- description of the check valve provided suitably is abbreviate
- the second sub-tank 241 is one or a plurality of ink chambers for storing ink pumped from the ink tank 51 by the supply pump 53.
- the capacity of the second sub tank 241 is usually smaller than the ink tank 51.
- the second sub tank 241 is provided with a float sensor 241a, and the control unit 40 operates the supply pump 53 based on the liquid level position detection data by the float sensor 241a so that a predetermined amount of ink is stored. It has become.
- the deaeration module 242 performs a deaeration process for removing air from the ink that has flowed in, and discharges the deaerated ink.
- the deaeration module 242 of this embodiment can generally reduce the air concentration in the ink to a level that does not adversely affect ink ejection by one deaeration, but by performing deaeration multiple times, Further, the air concentration can be reduced.
- FIG. 6 is a cross-sectional view taken along a plane passing through the central axis of the cylindrical deaeration module 242.
- the deaeration module 242 has a shape in which a large number of hollow fiber membranes 2426 cover the periphery of the central tube 2424 inside the outer shell 2421.
- One end of the central tube 2424 is connected to the ink inlet 2422, and the other is sealed with a plug 2424a.
- An infinite number of fine holes 2424b are provided on the outer wall of the central tube 2424, and the ink that has flowed into the central tube 2424 from the ink inlet 2422 flows out of the fine holes 2424b to the surroundings to form hollow fibers.
- the ink flows out of the film 2426 and flows out from the ink outlet 2423.
- the hollow fiber membrane 2426 has a large number of hollow fine yarn structures with one end blocked, and the membrane surface has gas permeability.
- the other end of the fine fiber structure of the hollow fiber membrane 2426 is connected to the gas outlet 2425, and the inside of the fine fiber structure of the hollow fiber membrane 2426 is decompressed by sucking air with the vacuum pump 249. In this state, when the ink contacts the membrane surface of the hollow fiber membrane 2426, only the air in the ink selectively permeates the membrane surface and the ink is deaerated.
- the liquid feed pump 243 sends the ink flowing out from the ink outlet 2423 of the deaeration module 242 to the first sub tank 245.
- a check valve 244 is provided between the liquid feed pump 243 and the first sub tank 245 to prevent the ink once sent to the first sub tank 245 from flowing backward.
- the first sub tank 245 is a small ink chamber in which the ink deaerated by the deaeration module 242 is temporarily stored. Although not particularly limited, the first sub tank 245 has substantially the same capacity as the second sub tank 241.
- the first sub tank 245 is connected to the inlet 240a of each recording head 24a, and ink corresponding to the amount of ink ejected from the nozzles is supplied from the first sub tank 245 to each recording head 24a.
- the first sub tank 245 is provided with a float sensor 245a, and the control unit 40 operates the liquid feed pump 243 based on the liquid level position detection data by the float sensor 245a so that a predetermined amount of ink is stored. It has become.
- the first sub tank 245 is provided with a floating lid 245b to cover the surface of the deaerated ink. Since the first sub tank 245 is open to the atmosphere, the contact area between the atmosphere and the degassed ink is reduced by the floating lid 245b, thereby preventing air from being mixed into the ink again. In the ink jet recording apparatus 1 used for industrial applications, the amount of air mixed again is often small because the ink deaerated by continuous image formation or the like is not stored in the first sub tank 245 for a long time. Therefore, the first sub-tank 245 may be configured without this floating lid 245b.
- the ink that has not been ejected from the nozzles of the recording head 24a can be returned from the outlet 240b to the second sub-tank 241 via the recovery path 241b (recovery path) and the valve 241c.
- the ink in the recording head 24a can be collected without being wasted by opening the valve 241c.
- a trap 248 is provided between the deaeration module 242 and the vacuum pump 249 via a check valve 247.
- the hollow fiber membrane 2426 normally does not allow liquid ink to pass therethrough, but a small amount of ink may pass depending on the degree of negative pressure by the vacuum pump 249.
- the trap 248 collects the ink before that.
- the ink collected by the trap 248 can be extracted by opening a valve (not shown) connected to the trap 248.
- the deaeration module 242 is provided in the middle of the normal ink flow path from the ink tank 51 to the recording head 24a, and the ink passes through the deaeration module 242 at least once. It has a configuration. That is, the deaeration process for the ink supplied from the ink tank 51 and the supply of the deaerated ink to the recording head 24a are performed as a series of operations without being switched.
- a circulation pump 246 and a circulation channel 24c are provided in parallel with the deaeration module 242, and ink can be allowed to flow into the deaeration module 242 a plurality of times as necessary, so that image formation is interrupted.
- deaeration can be performed multiple times to increase the degree of deaeration.
- the deaeration degree of the ink that has been reduced can be quickly increased and recovered.
- a decrease in the degree of deaeration due to the retention of ink in the first sub-tank 245 poses no problem, but the ink retention time in the first sub-tank 245 is reduced due to the small amount of ink discharged. If the degassing module 242 increases the ink degassing degree when it is relatively long, an effect of maintaining the ink degassing degree in the entire first sub tank 245 can be obtained.
- the flow rate of the circulation pump 246 can be appropriately adjusted by the CPU 401 of the control unit 40.
- the flow rate of the circulation pump 246 may be controlled according to the amount of ink discharged from the recording head 24a so that the sum of the flow rates of the liquid feed pump 243 and the circulation pump 246 is constant.
- the circulation pump 246 is simply turned off while the liquid feed pump 243 is operating, and the circulation pump 246 is turned on when the circulation pump 246 is not operating (or when the ink flow rate is a predetermined value or less). It's also good.
- the maximum flow rate of the circulation pump 246 is equal to or less than the maximum flow rate of the ink flow path 24b. Even if a flow rate larger than the maximum flow rate of the ink flow path 24b is set, the deaeration module 242 cannot allow sufficient ink to flow into the circulation flow path 24c, particularly when the check valve 244 is not provided. Causes the ink to flow backward from the first sub-tank 245, which causes a problem in ink ejection in the recording head 24a. Further, as described above, the flow rate of the liquid feed pump 243 is not decreased with respect to the increase of the flow rate of the liquid feed pump 243, but within the range of the maximum flow rate of the ink flow path 24b. On the other hand, by operating the circulation pump 246 at a flow rate of a predetermined ratio, adjustment may be made so that a predetermined ratio of ink is always circulated.
- the ink in the ink flow path 24 b is heated and kept warm by the ink heating unit 270.
- the deaeration module 242 is provided with a heating wire 271 (heating unit). Since heat from a heater or a heat transfer plate that covers the outside is difficult to be transferred to the inside of the deaeration module 242, it is possible to conduct heat to the inside by separately heating in this manner, so that the inside of the normal ink flow path 24 b Ink is heated more efficiently inside the deaeration module 242 having a longer ink residence time.
- the deaeration module 242 is appropriately circulated by the circulation pump 246 to circulate the ink in the deaeration module 242.
- the entire ink flowing through the circulation channel 24c is heated and kept warm in an appropriate and balanced manner.
- the ink can be quickly heated so that it can be circulated and discharged at an appropriate temperature.
- FIG. 7 is a block diagram showing the internal configuration of the inkjet recording apparatus 1.
- the ink jet recording apparatus 1 includes a control unit 40, a transport driving unit 41, a head driving unit 42, a communication unit 43, an operation display unit 44, a paper heating unit 23, an irradiation unit 25, and an ink heater driving unit 27.
- a first float sensor 241a, a second float sensor 245a, a weight sensor 52, a supply pump 53, a circulation pump 246, a liquid feed pump 243, and a vacuum pump 249 are connected to a bus 49 and connected to each other. It is configured to be able to send and receive signals.
- the CPU 401 of the control unit 40 receives measurement signals and status signals from these units, and transmits control signals that cause each unit to perform appropriate operations.
- the transport drive unit 41 operates the paper feed unit 10, the image forming drum 21 of the image forming unit 20, the delivery unit 22, the delivery unit 26, and the paper discharge unit 30 based on a control signal from the control unit 40 to appropriately perform the operation.
- the recording medium P is transported at timing and speed.
- the head driving unit 42 operates the head unit 24 based on a control signal from the control unit 40 and causes the ink to be ejected from a plurality of nozzles at an appropriate timing to form an image on the recording medium P.
- the control unit 40 outputs control signals to the transport driving unit 41, the head driving unit 42, the paper heating unit 23, and the irradiation unit 25 and operates them at appropriate timings, so that the recording medium P is subjected to the head unit 24 under appropriate conditions.
- the ink ejected onto the recording medium P is cured.
- the communication unit 43 controls communication between the inkjet recording apparatus 1 and an external device.
- a print job and various control signals transmitted from the external device are received via the communication unit 43 and sent to the control unit 40.
- the control unit 40 performs various processes for image formation according to the acquired print job. Note 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 operation display unit 44 is, for example, a touch panel having a liquid crystal screen and a touch sensor.
- the control unit 40 outputs a display control signal to display a status, a menu, and the like on the liquid crystal screen.
- the touch sensor receives an input operation from the outside and outputs an input signal to the control unit 40.
- the control unit 40 performs various processes based on the input signal.
- the ink heater drive unit 27 switches the energization state of the heater of the ink heating unit 270 to keep the ink heating unit 270 at an appropriate temperature, and heats each recording head 24a, the ink flow path 24b, and the circulation flow path 24c.
- the ink is phase-changed and maintained in a liquid (sol) state.
- the energization state of the ink heater driving unit 27 is switched by the control unit 40 based on the temperature measured by the temperature sensor provided in each unit of the ink heating unit 270.
- FIG. 8 is a diagram illustrating a first modification of the ink flow path 24b in the ink jet recording apparatus 1 of the present embodiment.
- the second sub tank 241 is omitted, and the configuration relating to the recovery path 241b from the outlet 240b of the recording head 24a to the ink flow path 24b is omitted.
- Other configurations are the same, and the same reference numerals are given and description thereof is omitted.
- the necessary ink amount may be directly supplied from the ink tank 51 as appropriate.
- the second sub tank 241 is smaller than the ink tank 51, but the power consumption required for heating and keeping the ink increases as the amount of ink increases. Therefore, the power consumption can be reduced by omitting the second sub tank 241. I can do it.
- FIG. 9 is a diagram illustrating a second modification of the ink flow path 24b in the inkjet recording apparatus 1 of the present embodiment.
- the first sub tank 245 is further omitted.
- symbol is attached
- the deaerated ink is directly sent to the recording head 24a and ejected, so that it is possible to further prevent air from being mixed again into the ink after deaeration. It can be discharged at an appropriate temperature.
- the ink pressure inside the recording head 24a tends to be uneven. Therefore, it is desirable that the presence / absence of the first sub tank 245 in the inkjet recording apparatus 1 is properly used according to the operation characteristics such as fineness and highness required for the formed image. For example, when high-definition image formation such as signboard painting is not required, problems do not easily occur even if the first sub tank 245 is not provided.
- the inkjet recording apparatus 1 of the present embodiment includes the ink tank 51, the recording head 24a for ejecting ink to form an image, and the ink flow for supplying ink from the ink tank 51 to the recording head 24a.
- a circulation channel 24c provided in the middle of the circulation channel 24c and returning the ink flowing out from the deaeration module 242 to a position where the ink flows into the deaeration module 242, and the ink channel 24b from the circulation channel 24c is provided.
- No sub tank is provided between the outlet and the inlet to the circulation channel 24c and the circulation channel 24c. It has been configured to be capable ink flows at a substantially constant velocity in accordance with the flow rate of the flop 246 and the liquid feed pump 243. Accordingly, since the ink that has not been deaerated does not flow into the first sub tank 245, it is possible to prevent a situation in which the ink cannot be ejected until the deaeration process is completed. Further, it is possible to avoid a situation where the degree of deaeration does not increase easily even if the number of deaerations increases until the ink in the sub-tank in the circulation path is replaced.
- the degree of deaeration can be quickly increased or the temperature of the ink can be increased to an appropriate temperature, so that image formation can be started promptly.
- the ink in the sub tank does not flow out uniformly or in the order in which it flows, the ink in the first sub tank 245 is not returned to the deaeration module 242 again (not circulated), so that the first sub tank 245 is configured. It is possible to prevent the occurrence of uneven ink ejection and uneven image quality due to uneven distribution of inks having different degrees of deaeration.
- the ink supplied from the ink tank 51 always passes through the degassing module 242 and the degassed ink can be sent to the recording head 24a as it is, the degassing of the ink and the recording head of the degassed ink are performed.
- the supply to 24a can be performed simultaneously. Therefore, it is not necessary to interrupt image formation for degassing ink, and image formation can be performed continuously.
- the flow control of the ink to be circulated is performed by the circulation pump 246 and can be appropriately adjusted according to the amount of liquid fed to the recording head 24a, so that the trouble of switching the flow path with a three-way valve or the like can be saved, Deaeration and ink supply can be performed with an easy configuration and operation.
- the deaeration module 242 of the deaeration device is provided with a heating wire 271 so that it can be heated separately from the entire ink flow path, and while being deaerated in the deaeration module 242, Heat can also be transmitted to areas where heat cannot reach directly, thereby preventing the ink temperature from decreasing. Thereby, even when the ink flowing out from the deaeration module 242 is ejected from the nozzle without taking a long time, the temperature of the ink can be stably maintained at an appropriate temperature. Further, it is possible to prevent the ink from gelling in the deaeration module 242 and hindering the flow.
- the flow rate of the circulation pump 246 is set to be equal to or less than the maximum flow rate of the ink flow path 24b, it is necessary while suppressing the occurrence of the problem that the deaerated ink flows backward or further air is mixed. An ink having a desired deaeration degree can be obtained at a corresponding flow rate.
- the control unit 40 controls the operation of the circulation pump 246.
- the control unit 40 operates the circulation pump 246 in the ink flow path 24b when the ink flow rate to the recording head 24a is equal to or less than a predetermined value. Circulate the ink. Accordingly, the degree of deaeration can be adjusted as appropriate in a situation where a large amount of ink is not ejected at all.
- the control unit 40 operates the circulation pump so that no ink is discharged, that is, the control unit 40 sends the ink from the liquid feed pump 243 to the first sub tank 245. Even in such a situation, the ink can be appropriately moved in the ink flow path 24b and the circulation flow path 24c so that the entire ink can be maintained in an appropriate temperature state with a good balance.
- control unit 40 switches whether the circulation pump 246 can operate according to the presence / absence of an ink discharge command related to image formation, before or in synchronization with the timing at which the operation related to ink discharge actually starts or is interrupted.
- the ink degassing degree and temperature can be adjusted quickly.
- the deaerated ink can be stored in advance to some extent. Ink can be discharged with a margin during image formation. Further, since only the ink that has been deaerated is stored in the first sub tank 245 and the ink does not circulate between the first sub tank 245 and the deaeration module 242, the ink is removed from the first sub tank 245. This prevents a situation in which ink that is not noticed is mixed and ink cannot be immediately output to the nozzles.
- a second sub tank 241 is provided between the ink tank 51 and the outlet from the circulation flow path 24c to the ink flow path 24b, and a recovery path 241b for returning the ink of the recording head 24a to the second sub tank 241 is provided. ing. Therefore, the ink in the recording head 24a can be reused without wasting it, especially during maintenance. Further, in such a case, by returning the ink to the near side of the inflow side to the deaeration module 242, the deaeration module 242 is allowed to pass through the deaeration module 242 while being mixed with the ink before the deaeration. A sufficiently deaerated ink can be supplied again.
- the present invention is not limited to the above-described embodiment, and various modifications can be made.
- the case where both the second sub tank 241 and the first sub tank 245 are provided the case where both are not provided, and the case where only the first sub tank 245 is provided are taken as examples.
- only the second sub tank 241 may be provided.
- the liquid feed pump 243 is provided to send the ink to the first sub tank 245.
- a pump or a valve is connected to the second sub tank 241 and the first sub tank 245, and the second sub tank 241 is connected to the second sub tank 241.
- a configuration may be employed in which a pressure difference is generated between the first sub tanks 245 to send ink to the first sub tank 245.
- the heating wire 271 is wound around the deaeration module 242, and the deaeration module 242 can be heated particularly efficiently in the ink heating unit 270. It is good also as performing only the heating similar to a part. In this case, when the flow rate of the liquid feed pump 243 is not large, the flow rate of the circulation pump 246 may be increased to adjust the time for the ink to stay inside the deaeration module 242.
- the ink is not limited to the UV curable ink. Even in the case of ordinary liquid ink, if the amount of air contained in the ink increases, the discharge capability of the recording head 24a decreases, and thus the present invention can be similarly applied. Also, since there are many such liquid inks whose viscosity changes depending on the temperature, the ink heating unit 270 is also preferably provided in the same manner, so that the ink can be warmed up quickly when the apparatus is started up. Can be done.
- the recording medium P has been described on the assumption that the printing paper is supplied from the paper supply unit 10 and discharged to the paper discharge unit 30, but the recording medium P is not limited to a paper medium.
- a sheet other than fabric or paper may be used.
- the inkjet recording apparatus 1 is not limited to a one-pass type line head, and may be a two-pass type or a serial head.
- the present invention can be used in an ink jet recording apparatus provided with a deaeration device.
Abstract
Description
また、脱気装置は、その内部に何らかの真空状態を確保しているため、脱気装置内のインクへの熱伝導性が悪く、加熱によるインクの温度上昇に時間がかかる。これに対し、脱気装置内のインクを循環させることが効率的なインクの加熱に有効であるが、循環経路の途中にサブタンクがあると、加熱に対する効果が小さくなってしまい、インクの加温時、特に、装置の立ち上げ時に時間を要するという課題がある。
インクを貯留するインクタンクと、
インクを吐出させて画像を形成するための記録ヘッドと、
前記インクタンクから前記記録ヘッドにインクを供給するインク流路と、
前記インク流路の途中に設けられてインクから空気を除去する脱気装置と、
前記インク流路における前記脱気装置の両側に両端がそれぞれ接続された循環流路と、
前記循環流路の途中に設けられて、前記脱気装置から流出したインクを前記脱気装置に流入する位置に戻す循環ポンプと、
を備え、
前記インク流路における前記循環流路からの流出口と前記循環流路への流入口との間、及び前記循環流路は、インクが略等速度で移動可能に形成されている
ことを特徴とするインクジェット記録装置である。
前記脱気装置には、加熱部が設けられていることを特徴としている
前記インクは、所定の温度以上に加熱することでゾル化するゲル状インクであることを特徴としている。
前記循環ポンプの流量は、前記インク流路の最大流量以下であることを特徴としている。
前記循環ポンプの動作制御を行う制御部を備え、
前記制御部は、前記記録ヘッドへのインク流量が所定の値以下の場合に、前記循環ポンプを動作させて前記インク流路中のインクを循環させる
ことを特徴としている。
前記制御部は、前記記録ヘッドへインクが供給されていない場合に、前記循環ポンプを動作させることを特徴としている。
前記循環ポンプの動作制御を行う制御部を備え、
前記制御部は、画像形成に係るインク吐出命令の有無に応じて前記循環ポンプの動作可否を切り替える
ことを特徴としている。
前記循環流路の流入口と、前記記録ヘッドとの間には、第1貯留部が設けられていることを特徴としている。
前記インクタンクと、前記循環流路の流出口との間には、第2貯留部が設けられ、
前記記録ヘッドのインクを前記第2貯留部に戻す回収流路が設けられている
ことを特徴としている。
図1は、本発明の実施形態のインクジェット記録装置1の全体構成を示す模式図である。
本実施形態のヘッドユニット24は、記録媒体Pの搬送方向に垂直な方向(幅方向)について記録媒体Pの全体をカバーする長さ(幅)で設けられている。即ち、インクジェット記録装置1は、ワンパス方式のラインヘッド型インクジェット記録装置である。ヘッドユニット24は、複数の記録ヘッド24aを配列してラインヘッドを構成することが出来る。
インク供給部50は、インクタンク51と、重量センサー52と、供給ポンプ53と、供給管54と、筐体55などを備える。
このインクの製造方法は、例えば、特開2013-230633号公報などに開示されている。
また、脱気モジュール242に対して並列に循環ポンプ246が設けられ、脱気モジュール242の両端に接続された循環流路24cを介し、脱気モジュール242から流出したインクを脱気モジュール242の流入口手前に戻すことが可能となっている。
従って、インク流路24bと循環流路24cの流出口との合流点から脱気モジュール242への流入口までの間、及び、脱気モジュール242からの流出口からインク流路24bと循環流路24cへの流入口との分岐点までの間、及び、循環流路24cでは、インクは、送液ポンプ243や循環ポンプ246の流量に応じて略等速でインクが流れる。ここで、略等速とは、送液ポンプ243や循環ポンプ246の流量の変動(脈動)といった影響を考慮しつつ、平均的に等速と見なすことが出来る程度の速度範囲にあることを示す。
これら記録ヘッド24a、インク流路24b及び循環流路24cは、ヒーターやヒーターからの熱を伝える伝熱部材などのインク加熱部270によって加熱、保温されて、インクの温度が適切な温度に保たれるようになっている。このインク加熱部270のヒーターとしては、例えば、電熱線が用いられ、通電されることによりジュール熱を生じる。伝熱部材としては、熱伝導率の高い部材、例えば、各種金属(合金)で形成された熱伝導板が用いられ、インク流路24bや循環流路24cの配管を覆ったり、第2サブタンク241や第1サブタンク245の側壁に接触させたりして設けられる。
脱気モジュール242は、外殻2421の内部において、中心管2424の周囲を多数の中空糸膜2426が覆う形状になっている。中心管2424の一端は、インク流入口2422に繋がり、他方は、プラグ2424aで封止されている。中心管2424の外壁には、無数の細穴2424b(ミシン穴)が設けられており、インク流入口2422から中心管2424に流入したインクは、これら細穴2424bから周囲に流出して、中空糸膜2426の間を抜けてインク流出口2423から流出する。
なお、循環ポンプ246の最大流量は、インク流路24bの最大流量以下とされる。インク流路24bの最大流量より大きい流量が設定されても脱気モジュール242は、十分なインクを循環流路24cに流入させることが出来ず、特に、逆止弁244が設けられていない場合には、インクを第1サブタンク245から逆流させてしまうことになって、記録ヘッド24aにおけるインクの吐出に問題が生じる。
また、上述のように、送液ポンプ243の流量の増加に対して循環ポンプ246の流量を減少させるのではなく、インク流路24bの最大流量以下の範囲内において、送液ポンプ243の流量に対して所定の比率の流量で循環ポンプ246を動作させることで、常に所定の割合のインクが循環するように調整しても良い。
図7は、インクジェット記録装置1の内部構成を示すブロック図である。
制御部40は、搬送駆動部41、ヘッド駆動部42、用紙加熱部23及び照射部25に制御信号を出力してそれぞれ適宜なタイミングで動作させて、記録媒体Pを適切な条件でヘッドユニット24の複数のノズルと対向させ、また、記録媒体P上に吐出されたインクを硬化させる。
図8は、本実施形態のインクジェット記録装置1におけるインク流路24bの変形例1を示す図である。
この変形例1のインク流路24bでは、第2サブタンク241が省略され、また、記録ヘッド24aのアウトレット240bからインク流路24bへの回収路241bに係る構成が省略されている。その他の構成については同一であり、同一の符号を付して説明を省略する。
この変形例2のインク流路24bでは、更に、第1サブタンク245が省略されている。その他の同一の構成については、同一の符号を付して説明を省略する。
従って、脱気されていないインクが第1サブタンク245に流入することがないので、脱気処理が終了するまでインクの吐出が出来ないという事態を防ぐことが出来る。また、循環路中のサブタンク内のインクが入れ替わるまで脱気の回数が増えても脱気度がなかなか上がらないという状況を避けることが出来る。特に、インクジェット記録装置1の電源投入時に速やかに脱気度を上げたり、インクの温度を適切な温度に上げたりすることが出来るので、速やかに画像の形成を開始させることが出来る。
また、サブタンク中のインクは、均一に又は流入した順に流出する訳ではないので、第1サブタンク245のインクを再度脱気モジュール242に戻さない(循環させない)構成とすることで、第1サブタンク245内で不自然に脱気度の異なるインクが偏在してインクの吐出ムラや画質のムラが生じるのを防ぐことが出来る。
例えば、上記実施の形態では、第2サブタンク241と第1サブタンク245の両方が設けられている場合、両方とも設けられていない場合、及び、第1サブタンク245のみが設けられている場合を例に挙げて説明したが、この他、第2サブタンク241のみが設けられていても良い。
10 給紙部
11 給紙トレー
12 搬送部
121 ローラー
122 ローラー
123 ベルト
20 画像形成部
21 画像形成ドラム
22 受け渡しユニット
221 スイングアーム部
222 ドラム
23 用紙加熱部
24 ヘッドユニット
24a 記録ヘッド
24b インク流路
24c 循環流路
240a インレット
240b アウトレット
241 第2サブタンク
241a フロートセンサー
241b 回収路
241c バルブ
242 脱気モジュール
2421 外殻
2422 インク流入口
2423 インク流出口
2424 中心管
2424a プラグ
2424b 細穴
2425 気体流出口
2426 中空糸膜
243 送液ポンプ
244 逆止弁
245 第1サブタンク
245a フロートセンサー
245b 浮き蓋
246 循環ポンプ
247 逆止弁
248 トラップ
249 真空ポンプ
25 照射部
26 デリバリー部
261 ローラー
262 ローラー
263 ベルト
264 ドラム
27 インクヒーター駆動部
270 インク加熱部
271 電熱線
30 排紙部
31 排紙トレー
40 制御部
401 CPU
402 ROM
403 RAM
41 搬送駆動部
42 ヘッド駆動部
43 通信部
44 操作表示部
49 バス
50 インク供給部
51 インクタンク
52 重量センサー
53 供給ポンプ
54 供給管
55 筐体
60 インクパック
P 記録媒体
Claims (9)
- インクを貯留するインクタンクと、
インクを吐出させて画像を形成するための記録ヘッドと、
前記インクタンクから前記記録ヘッドにインクを供給するインク流路と、
前記インク流路の途中に設けられてインクから空気を除去する脱気装置と、
前記インク流路における前記脱気装置の両側に両端がそれぞれ接続された循環流路と、
前記循環流路の途中に設けられて、前記脱気装置から流出したインクを前記脱気装置に流入する位置に戻す循環ポンプと、
を備え、
前記インク流路における前記循環流路からの流出口と前記循環流路への流入口との間、及び前記循環流路は、インクが略等速度で移動可能に形成されている
ことを特徴とするインクジェット記録装置。 - 前記脱気装置には、加熱部が設けられていることを特徴とする請求項1記載のインクジェット記録装置。
- 前記インクは、所定の温度以上に加熱することでゾル化するゲル状インクであることを特徴とする請求項2記載のインクジェット記録装置。
- 前記循環ポンプの流量は、前記インク流路の最大流量以下であることを特徴とする請求項1~3の何れか一項に記載のインクジェット記録装置。
- 前記循環ポンプの動作制御を行う制御部を備え、
前記制御部は、前記記録ヘッドへのインク流量が所定の値以下の場合に、前記循環ポンプを動作させて前記インク流路中のインクを循環させる
ことを特徴とする請求項1~4の何れか一項に記載のインクジェット記録装置。 - 前記制御部は、前記記録ヘッドへインクが供給されていない場合に、前記循環ポンプを動作させることを特徴とする請求項5記載のインクジェット記録装置。
- 前記循環ポンプの動作制御を行う制御部を備え、
前記制御部は、画像形成に係るインク吐出命令の有無に応じて前記循環ポンプの動作可否を切り替える
ことを特徴とする請求項1~4の何れか一項に記載のインクジェット記録装置。 - 前記循環流路の流入口と、前記記録ヘッドとの間には、第1貯留部が設けられていることを特徴とする請求項1~7の何れか一項に記載のインクジェット記録装置。
- 前記インクタンクと、前記循環流路の流出口との間には、第2貯留部が設けられ、
前記記録ヘッドのインクを前記第2貯留部に戻す回収流路が設けられている
ことを特徴とする請求項1~8の何れか一項に記載のインクジェット記録装置。
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CN201580009915.1A CN106061745B (zh) | 2014-02-24 | 2015-01-21 | 喷墨记录装置 |
JP2016504007A JP6361727B2 (ja) | 2014-02-24 | 2015-01-21 | インクジェット記録装置 |
US15/118,221 US9931860B2 (en) | 2014-02-24 | 2015-01-21 | Inkjet printing apparatus |
EP15752674.0A EP3112172B1 (en) | 2014-02-24 | 2015-01-21 | Inkjet printing apparatus |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2017148999A (ja) * | 2016-02-23 | 2017-08-31 | キヤノン株式会社 | 液体吐出装置、液体吐出方法、および液体吐出ヘッド |
JP2018118478A (ja) * | 2017-01-27 | 2018-08-02 | セイコーエプソン株式会社 | 液体噴射システム、および、コンピュータープログラム |
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EP3112172B1 (en) | 2019-10-30 |
EP3112172A1 (en) | 2017-01-04 |
US9931860B2 (en) | 2018-04-03 |
CN106061745B (zh) | 2017-11-03 |
CN106061745A (zh) | 2016-10-26 |
US20170182788A1 (en) | 2017-06-29 |
JP6361727B2 (ja) | 2018-07-25 |
JPWO2015125542A1 (ja) | 2017-03-30 |
EP3112172A4 (en) | 2018-04-11 |
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