WO2009157139A1 - 印刷装置 - Google Patents
印刷装置 Download PDFInfo
- Publication number
- WO2009157139A1 WO2009157139A1 PCT/JP2009/002463 JP2009002463W WO2009157139A1 WO 2009157139 A1 WO2009157139 A1 WO 2009157139A1 JP 2009002463 W JP2009002463 W JP 2009002463W WO 2009157139 A1 WO2009157139 A1 WO 2009157139A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ink
- flow path
- path
- cleaning liquid
- inkjet head
- Prior art date
Links
- 238000007639 printing Methods 0.000 title claims abstract description 73
- 238000004140 cleaning Methods 0.000 claims abstract description 131
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000011144 upstream manufacturing Methods 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 9
- 239000000049 pigment Substances 0.000 abstract description 27
- 239000002245 particle Substances 0.000 abstract description 20
- 238000011084 recovery Methods 0.000 description 12
- 238000001556 precipitation Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16517—Cleaning of print head nozzles
- B41J2/16552—Cleaning of print head nozzles using cleaning fluids
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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
- B41J2/1707—Conditioning of the inside of ink supply circuits, e.g. flushing during start-up or shut-down
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
Definitions
- the present invention relates to a printing apparatus that prints by ejecting sedimentary ink such as pigment ink from nozzles of an inkjet head.
- ink jet printing apparatus that uses sedimentary ink such as pigment ink
- ink is left in the ink tank or in an ink supply path from the ink tank to the ink jet head.
- Pigment particles in the solution precipitate and ink clogging occurs.
- problems such as inability to eject ink from the ink-jet head and changes in the concentration of pigment particles in the ink solution supplied to the ink-jet head, resulting in deterioration in print quality, occur.
- Patent Document 1 in order to prevent problems due to precipitation of pigment particles in an ink solution, an ink supply path capable of circulating ink without passing through an inkjet head is attached to an ink supply tank.
- An ink jet recording apparatus has been proposed. In this ink jet recording apparatus, even while ink is not supplied to the ink jet head, the ink in the tank is sucked up from one end of the ink supply path and flows into the ink supply path, and the tank is again supplied from the other end of the ink supply path. An ink circulation operation is performed to return the ink particles into the interior, thereby preventing the pigment particles from being precipitated in the ink supply path or tank.
- a magnet stirrer is attached in the tank for supplying ink, and by stirring the ink in the tank, precipitation of pigment particles in the tank can be prevented.
- precipitation of pigment particles can be prevented in the ink supply tank and in the circulation flow path of the ink supply path, but in the inkjet head or in the inkjet head and the ink. Precipitation of pigment particles cannot be prevented, for example, in the manifold connecting the supply flow paths.
- a cleaning operation for periodically ejecting ink from each nozzle of the ink jet head may be performed. However, when such a cleaning operation is performed, the amount of ink consumed unnecessarily increases and the running cost increases.
- An object of the present invention is to propose a printing apparatus capable of preventing precipitation of pigment particles in an ink solution in an ink jet head or an ink supply path without increasing ink consumption.
- the printing apparatus of the present invention provides: An inkjet head; An ink reservoir, An ink circulation channel for circulating the ink stored in the ink storage unit via an ink damper communicating with the inkjet head; An ink circulation pump for circulating ink along the ink circulation flow path; A bypass flow path communicating between the upstream branch position and the downstream merge position of the ink damper in the ink circulation flow path; A flow path switching means for switching a path of the ink circulating along the ink circulation flow path to one of a path passing through the ink damper and a path passing through the bypass flow path; A cleaning liquid reservoir, A cleaning liquid supply flow path having one end communicating with the cleaning liquid storage section and the other end communicating with a flow path portion between the branch position and the merge position in the ink circulation flow path; Channel opening and closing means for opening and closing the cleaning liquid supply channel; And a cleaning pump for sucking ink or cleaning liquid from the nozzles of the inkjet head.
- a first switching valve disposed at the branch position and a second switching valve disposed at the junction position can be used.
- the first switching valve is a three-way switching valve, and the three ports are respectively connected to the branch position upstream flow path, the branch position downstream flow path of the ink circulation flow path at the branch position, and It is sufficient to communicate with the upstream end of the bypass flow path.
- the second switching valve is a three-way switching valve, and the three ports are respectively connected to the upstream side flow path of the ink circulation flow path, the downstream flow path of the combined position, What is necessary is just to make it connect with the downstream end of a bypass flow path.
- the ink circulation pump, the flow path switching means, the flow path opening / closing valve, and the control means for controlling the cleaning pump be operated as follows.
- the control means drives the ink circulation pump at a predetermined interval in order to circulate the ink at a predetermined interval. Further, at the time of printing, the path of the ink circulating along the ink circulation path is switched to a path via the ink damper, and the cleaning liquid supply path is switched to a closed state. On the other hand, when the printing standby state continues for a predetermined time or more, the path of the ink circulating along the ink circulation path is switched to the path via the bypass path, the cleaning liquid supply path is opened, The cleaning pump is driven to suck the nozzles of the inkjet head.
- a stirring means for stirring the ink stored in the ink storage section instead of this, there may be provided a vibration means for applying vibration to the ink reservoir and stirring the ink in the ink reservoir.
- the ink circulation flow path is provided with a bypass flow path that circulates the ink by bypassing the ink jet head, and the ink from the ink storage portion is transferred to the ink of the ink jet head by the flow path switching means. It is possible to circulate along either one of the flow path that passes through the damper and the bypass flow path that bypasses the ink damper of the inkjet head. Therefore, the ink can be circulated along the ink circulation flow path both when printing is performed and when printing is not performed. Accordingly, it is possible to prevent the ink from being settled in the ink circulation flow path during printing and in a print standby state.
- the ink jet head can be disconnected from the ink circulation path.
- supplying the cleaning liquid to the ink jet head through the cleaning liquid supply flow path, and sucking out the supplied cleaning liquid from the nozzle the ink remaining in the ink jet head can be washed away.
- the ink jet head can be maintained in a normal state in which pigment particles are not precipitated without consuming ink.
- FIG. 1 is a schematic configuration diagram of a printing apparatus according to a first embodiment to which the present invention is applied.
- FIG. 4 is a schematic configuration diagram of a printing apparatus according to a second embodiment.
- FIG. 6 is a schematic configuration diagram of a printing apparatus according to a third embodiment.
- FIG. 6 is a schematic configuration diagram of a printing apparatus according to a fourth embodiment.
- FIG. 1 is a schematic configuration diagram of a printing apparatus according to a first embodiment to which the present invention is applied.
- the printing apparatus 1 includes an inkjet head 2 that prints with pigment ink such as white ink for textiles, an ink tank 3 that stores pigment ink to be supplied to the inkjet head 2, and ink that communicates with the inkjet head 2. And an ink circulation channel 4 that circulates ink via the damper 10.
- the upstream end of the ink circulation channel 4 is connected to the bottom of the ink tank 3, and the downstream end of the ink circulation channel 4 is connected to the top of the ink tank 3.
- the ink circulation flow path 4 is connected to a bypass flow path 5 that branches from the upstream portion (branch position) of the inkjet head 2 and joins at the downstream portion (merging position).
- the bypass flow path 5 is connected to the ink circulation flow path 4 via the three-way switching valve 6 at the branch position, and is connected to the ink circulation flow path 4 via the three-way switching valve 7 at the merge position.
- An ink circulation pump 8 and a filter 9 are arranged in a path from the joining position of the ink circulation flow path 4 to the ink tank 3.
- the three ports 6a, 6b, and 6c are respectively in the branch position at the branch position upstream flow path 4a, the branch position downstream flow path 4b, and the bypass flow path at the ink circulation flow path 4.
- 5 communicates with the upstream end 5a.
- the three-way switching valve 6 can be switched to a first switching position where the ports 6a and 6b communicate with each other and a second switching position where the ports 6a and 6c communicate.
- the three ports 7 a, 7 b, and 7 c are respectively connected to the ink circulation flow path 4 at the merge position upstream flow path 4 c, the merge position downstream flow path 4 d, and the bypass flow path at the merge position. 5 communicates with the downstream end 5b.
- the three-way switching valve 7 can be switched to a first switching position where the ports 7a and 7b communicate with each other and a second switching position where the ports 7b and 7c communicate.
- the ink damper 10 (ink manifold) communicating with the inkjet head 2 is connected between the branch position downstream flow path 4b and the merge position upstream flow path 4c in the ink circulation flow path 4. Ink is supplied to the inkjet head 2 through the ink damper 10.
- the inlet 10 a of the ink damper 10 is connected to the downstream channel 4 b at the branch position of the ink circulation channel 4, and the outlet 10 b is connected to the upstream channel 4 c at the merge point of the ink circulation channel 4. ing.
- An ink chamber 10c communicating with the inflow port 10a and the outflow port 10b is formed inside the ink damper 10, and the ink chamber 10c passes through a damper mechanism such as a damper film to form ink in the inkjet head 2. It communicates with a chamber (not shown).
- An ink chamber in the inkjet head 2 communicates with each nozzle (not shown).
- the printing apparatus 1 includes a cleaning tank 12 that stores a cleaning liquid for cleaning the inside of the inkjet head 2.
- Two cleaning liquid supply passages 13 and 14 are connected to the cleaning tank 12.
- the cleaning liquid supply flow path 13 is connected to the branch position downstream flow path 4 b in the ink circulation flow path 4 via the Y-shaped joint 15.
- An opening / closing valve 17 is attached to a position near the Y-shaped joint 15 in the cleaning liquid supply flow path 13.
- the other cleaning liquid supply flow path 14 is connected to the upstream flow path 4 c at the merge position in the ink circulation flow path 4 via a Y-shaped joint 16.
- an opening / closing valve 18 is attached to a position near the Y-shaped joint 16 in the cleaning liquid supply channel 14.
- a cleaning device 19 is disposed opposite to the nozzle surface 2 a of the inkjet head 2.
- the cleaning device 19 performs a cleaning operation for sucking the nozzles of the inkjet head 2 and sucking liquid such as ink or cleaning liquid in the nozzles.
- the cleaning device 19 includes a capping mechanism 19a that can move to a position that covers the nozzle surface of the inkjet head 2, and a cleaning pump 19b that can suck the space covered by the capping mechanism 19a.
- the discharge side of the cleaning pump 19b is connected to the waste liquid tank 19c.
- the control unit 20 of the printing apparatus 1 includes a signal processing unit such as a CPU, a storage unit that stores a control program and various data, and an input unit that receives external commands. Various controls are performed based on the print command and control command. Specifically, the control unit 20 drives the inkjet head 2 based on an external print command to perform a printing operation. In addition, a control signal is sent to the ink circulation pump in conjunction with the printing operation to circulate the ink along the ink circulation flow path 4. Further, a control signal is sent to the cleaning device 19 in conjunction with the printing operation or based on an external cleaning command to operate the capping mechanism 19a and the cleaning pump 19b.
- a signal processing unit such as a CPU
- a storage unit that stores a control program and various data
- an input unit that receives external commands.
- Various controls are performed based on the print command and control command.
- the control unit 20 drives the inkjet head 2 based on an external print command to perform a printing operation.
- a control signal is
- a control signal is sent to the three-way switching valves 6 and 7 and the on-off valves 17 and 18 to switch the three-way switching valves 6 and 7 and to open and close the on-off valves 17 and 18.
- the three-way switching valves 6 and 7 and the on-off valves 17 and 18 may be manually operated or controlled via another control unit without being controlled by the control unit 20 of the printing apparatus 1.
- the ink circulation pump 8 is periodically driven during the printing and the printing standby, and the ink circulation operation is periodically performed through the ink circulation flow path 4. It is also possible to continuously perform ink circulation by operating the ink circulation pump 8 continuously.
- the controller 20 closes the on-off valves 17 and 18 and closes the cleaning liquid supply channels 13 and 14. Further, the three-way switching valves 6 and 7 are set to the first switching position to form an ink circulation path that passes through the ink damper 10 of the inkjet head 2.
- the ink circulation pump 8 is driven in this state, the ink in the ink tank 3 flows via the ink damper 10 of the inkjet head 2.
- Ink is supplied to each nozzle of the inkjet head 2 via an ink damper 10.
- ink droplets are ejected from each nozzle onto a recording medium (not shown).
- the control unit 20 switches the three-way switching valves 6 and 7 to the second switching position to form a circulation path via the bypass flow path 5 that bypasses the inkjet head 2. To do.
- the ink circulation pump 8 is driven in this state, the ink circulates via the bypass flow path 5, so that the pigment particles in the ink precipitate in the flow path through which the ink circulates even when printing is not performed. This prevents ink clogging from occurring.
- the control unit 20 opens the on-off valves 17 and 18 to cause the cleaning liquid supply channels 13 and 14 to communicate with the ink damper 10 side of the inkjet head 2.
- the capping mechanism 19a of the cleaning device 19 covers the nozzle surface of the ink jet head 2 to make the periphery of the nozzle a sealed space, and the cleaning pump 19b is operated.
- the cleaning liquid in the cleaning tank 12 flows into the ink-jet head 2 via the cleaning liquid supply channels 13 and 14 and the ink damper 10 by the suction force of the cleaning pump 19b, and is sucked out from each nozzle to the waste liquid tank 19c. Discharged.
- these flow paths and the ink chambers and nozzles in the inkjet head 2 are cleaned. Therefore, the ink remaining in these flow paths and the inkjet head 2 can be washed away.
- the timing and cleaning time for cleaning the ink jet head 2 with the cleaning liquid can be set as appropriate. For example, when the control unit 20 detects that a printing operation has not been performed for a predetermined time or longer by a built-in timer, the control unit 20 performs cleaning by flowing a cleaning liquid continuously for a predetermined time, and then performs inkjet until printing is resumed Ink may not be supplied into the head 2. Alternatively, after cleaning, ink may be supplied again to the nozzles of the inkjet head 2 to enable printing, and thereafter, the cleaning operation and the ink supply operation may be repeated every time a predetermined time or more has elapsed. Further, a cleaning operation may be appropriately performed based on a cleaning command from the outside. The timing of the ink circulation operation via the bypass flow path is the same. Further, an ink circulation operation may be performed based on an external ink circulation command.
- the ink concentration flowing out to the ink circulation channel 4 can be made uniform. It is possible to prevent printing defects due to changes in the ink density supplied to the printer.
- a stirring means such as a stirrer
- FIG. 2 is a schematic configuration diagram of a printing apparatus according to the second embodiment to which the present invention is applied.
- the printing apparatus 1A includes an ink tank 21 that stores pigment ink such as white ink for textiles, an ink supply channel 22 and an ink recovery channel 23 that communicate with the ink tank 21, and an ink supply channel 22 and an ink recovery flow.
- An ink jet printer 24 to which a path 23 is connected is provided.
- the inkjet printer 24 includes an inkjet head 25 and a cleaning device 26 that are configured in the same manner as the inkjet head 2 and the cleaning device 19 in the first embodiment.
- An ink supply channel 22 is connected to the inkjet head 25 via a manifold (not shown), and ink is supplied into the inkjet head 25 from the ink supply channel 22.
- an ink recovery flow path 23 is connected to the capping mechanism 26a of the cleaning device 26.
- a cylinder 27 extending from the lid portion 21a of the ink tank 21 toward the bottom is attached.
- the lower end portion of the cylindrical body 27 is closed and sinks below the ink level.
- the cylindrical body 27 is formed of a stainless steel mesh material, and the mesh of the mesh portion is about 60 to 80 mesh when the number of meshes in one inch is 1 mesh. Yes.
- the ink recovery flow path 23 passes through the lid portion 21 a and is inserted into the cylindrical body 27, and the lower end of the ink recovery flow path 23 extends below the ink level in the cylindrical body 27.
- the ink supply flow path 22 penetrates the lid portion 21 a of the ink tank 21 at a position different from the ink recovery flow path 23, and the lower end of the ink supply flow path 22 extends below the ink level in the ink tank 21.
- the ink tank 21 is provided with a deaeration pipe 28 penetrating the lid 21a, and the lower end of the deaeration pipe 28 is opened above the ink level.
- a stirrer 29 is attached to the bottom of the ink tank 21, and the ink in the ink tank 21 can be agitated by rotating the stirrer 29 with a drive source such as a motor (not shown).
- a pump and a filter (not shown) are attached to the ink supply channel 22, and the ink in the ink tank 21 is sent to the ink jet head 25 side by this pump, and foreign matter flowing through the ink supply channel is filtered by the filter. Can do.
- the control unit of the inkjet printer 24 operates the pump of the ink supply flow path 22 to supply ink to the inkjet head 25 and perform printing.
- the control unit of the inkjet printer 24 closes the nozzle surface of the inkjet head 25 by the capping mechanism 26a of the cleaning device 26, and the cleaning pump 26b Aspirate the nozzle.
- ink can flow through the ink supply channel 22 and the liquid chambers and nozzles in the inkjet head 25.
- the sucked ink can be returned to the ink tank 21 by flowing through the ink recovery channel 23.
- the ink recovered from the ink recovery flow path 23 to the ink tank 21 is discharged into the cylindrical body 27.
- the ink flowing into the ink recovery flow path 23 from the cleaning device 26 contains bubbles, but when flowing into the ink tank 21, it passes through the fine mesh of the cylindrical body 27, and at this time, the bubbles are removed. Thereby, the ink collected in the ink tank 21 does not include bubbles. Therefore, it is possible to prevent the occurrence of printing defects due to the recirculation of the ink containing bubbles and the supply to the inkjet head 25.
- the ink jet head 25 since ink can flow to the ink jet head 25 via the ink supply channel 22 and the ink recovery channel 23 even when printing is not performed, the ink jet head The precipitation of the pigment particles in the ink solution in the ink supply channel 22 and the ink recovery channel 23 can be prevented. Further, by stirring the inside of the ink tank 21 with the stirrer 29, the precipitation of pigment particles in the ink tank 21 can be prevented. Therefore, it is possible to prevent the occurrence of printing defects due to the change in the ink density supplied to the inkjet head 25.
- FIG. 3 is a schematic configuration diagram showing a printing apparatus according to the third embodiment to which the present invention is applied.
- the printing apparatus according to the third embodiment can prevent precipitation of pigment particles in the ink tank.
- the printing apparatus 1B includes an ink tank 31 that stores pigment ink such as white ink for textiles, an ink supply channel 32 that communicates with the ink tank 31, an inkjet printer 33 that is connected to the ink supply channel 32, and the like. I have.
- the ink jet printer 33 has a known configuration including an ink jet head.
- the ink tank 31 is formed of an aluminum bag and is deaerated after containing ink therein and does not contain air.
- the printing apparatus 1B is attached to a motor 34, a cam mechanism 35 that converts the rotation of the output shaft of the motor 34 into a reciprocating motion in a linear direction, and is slid in a linear direction by a guide mechanism (not shown).
- a movable table 36 that is supported is provided, and an ink tank 31 is set on the movable table 36.
- the control unit of the ink jet printer 33 sends a drive signal to the motor 34 to rotate the motor 34 and vibrate the movable base 36 back and forth, thereby causing the ink tank 31 to rotate. Shake back and forth. In this way, the ink in the ink tank 31 is agitated by vibration and the precipitation of pigment particles in the ink solution is prevented, so that the concentration of the ink supplied from the ink supply channel 32 to the inkjet printer 33 is reduced. Print defects do not occur. Also, when the remaining amount of ink is low, dark ink containing a lot of pigment particles is not supplied to the ink jet printer 33 and the ink flow path and nozzles are not clogged.
- the cam mechanism 35 is not limited to the one that converts the rotational movement into the reciprocating movement in the linear direction, and the rotation of the motor 34 is converted into a movement that does not cause the pigment particles in the ink tank 31 to settle, so Anything that can be vibrated is acceptable. Further, instead of the motor 34 and the cam mechanism 35, a vibration motor or the like may be used.
- FIG. 4 is a schematic configuration diagram showing a printing apparatus according to a fourth embodiment to which the present invention is applied.
- the printing apparatus according to the fourth embodiment includes a configuration in which the cleaning liquid supply flow path of the cleaning unit can be connected to the ink supply path to the inkjet head.
- the printing apparatus 1 ⁇ / b> C includes an inkjet head 41 and a cleaning device 42 configured in the same manner as the inkjet head 2 and the cleaning device 19 in the first embodiment.
- the ink jet head 41 is connected to the ink supply channel 43, and precipitation pigment ink is supplied to the ink jet head 41 from an ink tank (not shown) via the ink supply channel 43.
- a pressure damper 41 a for ejecting ink is provided at a connection portion of the ink jet head 41 with the ink supply channel 43.
- the ink supply channel 43 includes an upstream channel 43a on the ink tank side and a downstream channel 43b on the inkjet head side.
- the upstream flow path 43a and the downstream flow path 43b are connected in a detachable state by connectors 44a and 44b attached to respective connection ends.
- the connector 44b attached to the end of the cleaning liquid supply channel 45 can be detachably connected to the connector 44b of the downstream channel 43b.
- the cleaning liquid supply channel 45 is connected to a cleaning tank 47 in the cleaning unit 46, and the cleaning liquid is stored in the cleaning tank 47.
- the cleaning liquid supplied from the cleaning liquid supply channel 45 to the inkjet head 41 is discharged to the drainage tank 49 through the cleaning liquid discharge channel 48 of the cleaning device 42.
- a cleaning pump 50 of the cleaning device 42 is attached to the cleaning liquid discharge channel 48.
- the cleaning pump 50 is operated for the time set in the timer 53 and the cleaning liquid is discharged from the cleaning tank 47. Supplied to the inkjet head 41 side.
- the cleaning liquid flows into the ink jet head 41 to wash away the precipitates of pigment particles contained in the ink solution remaining in the flow paths and liquid chambers in the ink jet head 41.
- the cleaning device 42, the cleaning tank 47, the drainage tank 49, and the like are unitized, and the cleaning liquid is supplied via the inkjet head 41 by the cleaning liquid supply channel 45 and the cleaning liquid discharge channel 48.
- the cleaning unit 46 is provided. Since the cleaning unit 46 can be separated from the printer portion having the ink jet head 41 in the printing apparatus 1C, the cleaning unit 46 is attached to the printer portion only when necessary, and the ink path in the printing apparatus 1C is easily clogged. Is also possible.
- the cleaning pump 50 can be automatically operated at a desired timing to clean the inkjet head 41 and the ink flow path.
- the timer 53 may be controlled by a control unit that controls the printing operation by the inkjet head 41 so that the cleaning operation is performed in conjunction with the printing operation by the inkjet head 41, or the printing is not performed for a predetermined time or longer. If the operation continues, the cleaning operation may be performed.
- the ink tank or ink bottle for supplying pigment ink or other ink is replaced with a tank or bottle containing cleaning liquid, and the cleaning pump 50 is operated in this state, whereby the ink path through which the ink flows. Further, the flow path and the ink chamber in the inkjet head 41 may be washed. In this case, it is not necessary to connect the connector 44b to the connector 44c of the cleaning liquid supply channel 45. In addition, if the ink tank and the ink bottle are emptied and the cleaning liquid is added to perform cleaning, the entire ink path including the inside of the ink tank and the ink bottle can be cleaned. If a plurality of ink tanks or ink bottles are provided for color printing, a part of them may be replaced with an ink tank or ink bottle for cleaning liquid.
Landscapes
- Ink Jet (AREA)
Abstract
Description
インクジェットヘッドと、
インク貯留部と、
前記インク貯留部に貯留されているインクを、前記インクジェットヘッドに連通しているインクダンパーを経由して循環させるためのインク循環流路と、
前記インク循環流路に沿ってインクを循環させるインク循環ポンプと、
前記インク循環流路における前記インクダンパーの上流側の分岐位置および下流側の合流位置の間を連通しているバイパス流路と、
前記インク循環流路に沿って循環するインクの経路を、前記インクダンパーを経由する経路および前記バイパス流路を経由する経路の一方に切り換える流路切換手段と、
クリーニング液貯留部と、
前記クリーニング液貯留部に一端が連通し、前記インク循環流路における前記分岐位置および前記合流位置の間の流路部分に他端が連通しているクリーニング液供給流路と、
前記クリーニング液供給流路を開閉する流路開閉手段と、
前記インクジェットヘッドのノズルからインクあるいはクリーニング液を吸引するクリーニングポンプとを有していることを特徴としている。
図1は本発明を適用した実施形態1に係る印刷装置の概略構成図である。印刷装置1は、テキスタイル用の白インクなどの顔料インクにより印刷するインクジェットヘッド2と、このインクジェットヘッド2に供給するための顔料インクを貯留するインクタンク3と、インクジェットヘッド2に連通しているインクダンパー10を経由してインクを循環させるインク循環流路4とを備えている。インク循環流路4の上流端はインクタンク3の底部に接続されており、インク循環流路4の下流端はインクタンク3の上部に接続されている。
この構成の印刷装置1では、印刷時および印刷待機時のいずれにおいても、インク循環ポンプ8を定期的に駆動して、インク循環流路4を介して定期的にインクの循環動作を行う。インク循環ポンプ8を連続運転してインクの循環を連続して行うことも可能である。
図2は、本発明を適用した実施形態2に係る印刷装置の概略構成図である。印刷装置1Aは、テキスタイル用白インクなどの顔料インクを貯留するインクタンク21と、インクタンク21内に連通するインク供給流路22およびインク回収流路23と、インク供給流路22およびインク回収流路23が接続されたインクジェットプリンタ24を備えている。
図3は、本発明を適用した実施形態3に係る印刷装置を示す概略構成図である。実施形態3の印刷装置は、インクタンク内における顔料粒子の沈殿を防止できるようにしたものである。
図4は、本発明を適用した実施形態4に係る印刷装置を示す概略構成図である。実施形態4に係る印刷装置は、インクジェットヘッドへのインク供給経路にクリーニングユニットのクリーニング液供給流路を接続可能にした構成を備えている。
2 インクジェットヘッド
2a ノズル面
3 インクタンク
4 インク循環流路
4a 分岐位置上流側流路
4b 分岐位置下流側流路
4c 合流位置上流側流路
4d 合流位置下流側流路
5 バイパス流路
5a 上流端
5b 下流端
6 三方切換弁
6a ポート
7 三方切換弁
7a ポート
8 インク循環ポンプ
9 フィルタ
10 インクダンパー
10a 流入口
10b 流出口
10c インク室
12 クリーニングタンク
13、14 クリーニング液供給流路
15、16 Y字ジョイント
17、18 開閉弁
19 クリーニング装置
19a キャッピング機構
19b クリーニングポンプ
19c 廃液タンク
20 制御部
21 インクタンク
21a 蓋部
22 インク供給流路
23 インク回収流路
24 インクジェットプリンタ
25 インクジェットヘッド
26 クリーニング装置
26a キャッピング機構
26b クリーニングポンプ
27 筒体
28 脱気管
29 スターラー
31 インクタンク
32 インク供給流路
33 インクジェットプリンタ
34 モータ
35 カム機構
36 可動台
41 インクジェットヘッド
41a 圧力ダンパ
42 クリーニング装置
43 インク供給流路
43b 下流側流路
43a 上流側流路
44a~44c コネクタ
45 クリーニング液供給流路
46 クリーニングユニット
47 クリーニングタンク
48 クリーニング液排出流路
49 排液タンク
50 クリーニングポンプ
51 電源スイッチ
52 スタートスイッチ
53 タイマ
Claims (5)
- インクジェットヘッドと、
インク貯留部と、
前記インク貯留部に貯留されているインクを、前記インクジェットヘッドに連通しているインクダンパーを経由して循環させるためのインク循環流路と、
前記インク循環流路に沿ってインクを循環させるインク循環ポンプと、
前記インク循環流路における前記インクダンパーの上流側の分岐位置および下流側の合流位置の間を連通しているバイパス流路と、
前記インク循環流路に沿って循環するインクの経路を、前記インクダンパーを経由する経路および前記バイパス流路を経由する経路の一方に切り換える流路切換手段と、
クリーニング液貯留部と、
前記クリーニング液貯留部に一端が連通し、前記インク循環流路における前記分岐位置および前記合流位置の間の流路部分に他端が連通しているクリーニング液供給流路と、
前記クリーニング液供給流路を開閉する流路開閉手段と、
前記インクジェットヘッドのノズルからインクあるいはクリーニング液を吸引するクリーニングポンプとを有していることを特徴とする印刷装置。 - 請求項1に記載の印刷装置において、
前記流路切換手段は、前記分岐位置に配置した第1切換弁、および、前記合流位置に配置した第2切換弁を備えており、
前記第1切換弁は三方切換弁であり、その3つのポートが、それぞれ、前記分岐位置において、前記インク循環流路の分岐位置上流側流路部分、分岐位置下流側流路部分、および、バイパス流路の上流端に連通しており、
前記第2切換弁は三方切換弁であり、その3つのポートが、それぞれ、前記合流位置において、前記インク循環流路の合流位置上流側流路部分、合流位置下流側流路部分、および、前記バイパス流路の下流端に連通していることを特徴とする印刷装置。 - 請求項1に記載の印刷装置において、
前記インク循環ポンプ、前記流路切換手段、前記流路開閉手段、および、前記クリーニングポンプを制御する制御手段を有し、
当該制御手段は、
所定間隔でインクを循環させるために、前記インク循環ポンプを所定間隔で駆動し、
印刷時には、前記インク循環流路に沿って循環するインクの経路を前記インクダンパーを経由する経路に切り換え、前記クリーニング液供給流路を閉じた状態に切り換え、
印刷待機状態が所定時間以上継続すると、前記インク循環流路に沿って循環するインクの経路を前記バイパス流路を経由する経路に切り換え、前記クリーニング液供給流路を開き、前記クリーニングポンプを駆動して前記インクジェットヘッドのノズルを吸引することを特徴とする印刷装置。 - 請求項1に記載の印刷装置において、
前記インク貯留部に貯留されているインクを攪拌するための攪拌手段を有していることを特徴とする印刷装置。 - 請求項1に記載の印刷装置において、
前記インク貯留部に振動を与えて、当該インク貯留部内のインクを攪拌するための加振手段を有していることを特徴とする印刷装置。
Priority Applications (6)
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EP09769849A EP2305475A1 (en) | 2008-06-24 | 2009-06-02 | Printing device |
US12/737,110 US20110115844A1 (en) | 2008-06-24 | 2009-06-02 | Printing device |
JP2010517688A JP5133412B2 (ja) | 2008-06-24 | 2009-06-02 | 印刷装置 |
AU2009263666A AU2009263666A1 (en) | 2008-06-24 | 2009-06-02 | Printing device |
CN2009801249593A CN102066115A (zh) | 2008-06-24 | 2009-06-02 | 印刷装置 |
IL209851A IL209851A0 (en) | 2008-06-24 | 2010-12-08 | Printing device |
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EP (1) | EP2305475A1 (ja) |
JP (1) | JP5133412B2 (ja) |
KR (1) | KR20110025767A (ja) |
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AU2009263666A1 (en) | 2009-12-30 |
US20110115844A1 (en) | 2011-05-19 |
IL209851A0 (en) | 2011-02-28 |
CN102066115A (zh) | 2011-05-18 |
JPWO2009157139A1 (ja) | 2011-12-08 |
EP2305475A1 (en) | 2011-04-06 |
KR20110025767A (ko) | 2011-03-11 |
JP5133412B2 (ja) | 2013-01-30 |
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