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WO2012101918A1 - Inkjet printing device - Google Patents

Inkjet printing device Download PDF

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Publication number
WO2012101918A1
WO2012101918A1 PCT/JP2011/078675 JP2011078675W WO2012101918A1 WO 2012101918 A1 WO2012101918 A1 WO 2012101918A1 JP 2011078675 W JP2011078675 W JP 2011078675W WO 2012101918 A1 WO2012101918 A1 WO 2012101918A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
ink tank
print head
printing apparatus
tank
Prior art date
Application number
PCT/JP2011/078675
Other languages
French (fr)
Japanese (ja)
Inventor
四朗 一ノ瀬
克己 土肥
富夫 中井
Original Assignee
東伸工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東伸工業株式会社 filed Critical 東伸工業株式会社
Priority to EP11856705.6A priority Critical patent/EP2669089A1/en
Priority to CN201180065878.8A priority patent/CN103347702A/en
Publication of WO2012101918A1 publication Critical patent/WO2012101918A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • 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
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
    • B41J2/16523—Waste ink transport from caps or spittoons, e.g. by suction
    • 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

Definitions

  • the present invention relates to an inkjet printing apparatus.
  • an object of the present invention is to provide an ink jet textile printing apparatus that can effectively use unused ink ejected by an idle ejection operation or the like.
  • An inkjet printing apparatus is an inkjet printing apparatus that performs printing by ejecting ink onto a material to be printed, and includes a first ink tank that stores ink, and ink that is supplied from the first ink tank. A second ink tank to be stored; a print head having a nozzle for discharging the ink supplied from the second ink tank to a printed material; and the second ink tank disposed between the second ink tank and the print head. And a degassing means for removing bubbles in the ink, and a recycle flow path for returning unused ink ejected from the nozzles of the print head to the second ink tank.
  • the ink jet printing apparatus includes the recycling flow path for returning unused ink ejected from the nozzles of the print head to the second ink tank by an idle ejection operation for preventing clogging of the nozzles.
  • the ink recycled in this way may contain bubbles or the like.
  • deaeration means is installed between the second ink tank and the print head according to the present invention, Ink can be supplied to the printhead.
  • the second ink tank can be an open type ink tank in which the ink contacts the atmosphere. .
  • the ink-jet textile printing apparatus can take various configurations.
  • the pressure loss of the ink in the deaeration means is 0.1 kPa or less.
  • the resistance from the second ink tank to the print head can be reduced, and ink can be supplied smoothly by the water head method.
  • the deaeration means is preferably an external perfusion type.
  • first ink tank, the second ink tank, and the deaeration means can be connected in series in this order.
  • the first ink tank can also be an open ink tank.
  • an ink pressurizing pump that supplies pressurized ink to the nozzles of the print head. According to this ink pressurizing pump, the ink in the nozzles of the print head can be forcibly discharged, and nozzle clogging can be reliably prevented.
  • a suction pump that sucks the ink in the nozzles of the print head.
  • the ink jet textile printing apparatus According to the ink jet textile printing apparatus according to the present invention, it is possible to effectively use unused ink ejected by an idle ejection operation or the like.
  • FIG. 1 is a schematic view of an inkjet printing apparatus according to the present embodiment.
  • FIG. 2 is a partial cross-sectional view of the deaeration module according to the present embodiment.
  • the ink jet textile printing apparatus 1 has the ink stored in the first ink tank 2 supplied to the second ink tank 3 and temporarily stored in the second ink tank 3. . Then, after the ink in the second ink tank 3 is deaerated by the deaeration module 4, the ink is supplied to the print head 5, and printing is performed by the print head 5 ejecting ink onto the object to be printed.
  • the inkjet textile printing apparatus 1 further includes a suction pad 6, a suction pump P1, and an ink pressure pump P2 as clogging prevention means for preventing clogging of the nozzles of the print head 5.
  • a filter unit 7 is also provided for removing dust and the like in unused ink ejected from the print head 5 by the idle ejection operation by the clogging prevention means.
  • the first ink tank 2 is an open type ink tank that stores ink to be supplied to the second ink tank 3. When the ink in the first ink tank 2 runs out, the first ink tank 2 is replaced with a new one. However, the first ink tank 2 can be replenished with ink.
  • the first ink tank 2 is an open type, it may be a sealed type having a structure that does not allow ink to come into contact with the atmosphere.
  • the capacity of the first ink tank 2 is not particularly limited, but is generally about 5 to 10 L.
  • the second ink tank 3 is connected to the first ink tank 2 via an ink supply pump P3 and a three-way valve V1.
  • the second ink tank 3 is an open type ink tank that temporarily stores the ink supplied from the first ink tank 2 and the ink discharged by the idle discharge operation, and the print head 5 is formed by a water head method. Ink is being supplied.
  • the second ink tank 3 is provided with a liquid level detection sensor 31 for detecting the ink level in order to control the water head. When the liquid level detection sensor 31 detects that the liquid level of the ink stored in the second ink tank 3 has fallen below the set value due to printing, the ink supply pump P3 is activated to remove the ink level from the first ink tank 2. Ink is supplied to the second ink tank 3.
  • the second ink tank 3 is an open type, but may be a sealed type.
  • the second ink tank 3 has a smaller capacity than the first ink tank 2 described above, and is generally about 70 to 100 mL.
  • the deaeration module 4 is installed between the second ink tank 3 and the print head 5, and removes bubbles present in the ink sent from the second ink tank 3 to the print head 5.
  • the deaeration module 4 is an external perfusion type, and a plurality of hollow fibers 42 are accommodated in a hollow cylindrical body 41.
  • a vacuum pump P4 is connected to at least one of the upper end and the lower end of each hollow fiber 42.
  • the ink sent into the cylindrical body 41 is configured to flow out of the hollow fiber 42 and be deaerated.
  • the ink sent from the second ink tank 3 into the cylindrical body 41 through the supply port 43 is sent to the center of the cylindrical body 41 and goes to the outside in the radial direction. Air bubbles contained in the ink are sucked into each hollow fiber 42 by contacting the outer surface of the hollow fiber 42.
  • the deaerated ink is discharged from the cylindrical body 41 through the discharge port 44 and sent to the print head 5.
  • the pressure loss of ink in the deaeration module 4 is preferably 0.1 kPa or less.
  • the vacuum pump P4 corresponds to the decompression means of the present invention.
  • the print head 5 discharges ink sent from the second ink tank 3 via the deaeration module 4 to the object to be printed, and a known print head having a plurality of nozzles can be used. Between the print head 5 and the deaeration module 4, two three-way valves V2 and V3, a pinch valve V4 installed between the three-way valves V2 and V3, and an ink pressurizing pump P2 are installed. Has been.
  • the ink pressurizing pump P2 is connected to a flow path connecting the print head 5 and the deaeration module 4 via the three-way valves V2 and V3.
  • the pinch valve V4 is in an open state, and ink from the second ink tank 3 is printed via the three-way valves V2, V3 and the pinch valve V4 without passing through the ink pressurizing pump P2. It is sent to the head 5.
  • the pinch valve V4 is closed.
  • the ink from the second ink tank 3 is sent to the ink pressurizing pump P2 via the three-way valves V2 and V3, and the high-pressure ink is sent to the nozzles of the print head 5, and the ink in the nozzles Is forcibly discharged to prevent nozzle clogging.
  • the ink discharged by the ink pressurizing pump P2 is discharged to a suction pad 6 described later.
  • a suction pad 6 and a suction pump P1 are installed as means for eliminating nozzle clogging of the print head 5.
  • the suction pad 6 is configured to seal the nozzle surface on which the nozzles of the print head 5 are formed.
  • the suction pump P ⁇ b> 1 By operating the suction pump P ⁇ b> 1 with the suction pad 6 sealing the nozzle surface of the print head 5, the ink in the nozzles of the print head 5 is forcibly sucked and discharged to the suction pad 6.
  • the suction pad 6 is removed from the print head 5 at the time of textile printing.
  • the suction pad 6 can also serve as a cap that prevents the ink in the nozzles from drying by covering the nozzles of the print head 5.
  • an ink discharge tube 61 is connected to the suction pad 6, and when the open / close means (not shown) such as an open / close valve installed in the ink discharge tube 61 is closed, the print head 5 is as described above.
  • the open / close means such as an open / close valve installed in the ink discharge tube 61
  • the print head 5 is as described above.
  • the opening / closing means is opened, the ink in the nozzles of the print head 5 is not sucked but only the ink in the suction pad 6 is sucked.
  • the flow path from the suction pad 6 to the second ink tank 3 corresponds to the recycle flow path of the present invention.
  • the ink discharged to the suction pad 6 is returned to the second ink tank 3 through the filter unit 7, the check valve V5, and the three-way valve V1. By passing through the filter unit 7, dust and the like in the ink are removed.
  • the check valve V5 since the check valve V5 is provided, it is possible to prevent the backflow of ink, and the ink sent from the first ink tank 2 to the second ink tank 3 is sent to the filter unit 7 side. It is prevented.
  • the ink supply pump P3 is stopped.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ink Jet (AREA)
  • Coloring (AREA)

Abstract

The problem is to provide an inkjet printing device capable of effectively using unused ink discharged by an idle discharge operation, etc. An inkjet printing device (1) for printing an object to be printed by discharging ink, is provided with: a first ink tank (2) for storing ink; a second ink tank (3) for storing the ink fed from the first ink tank (1); a print head (5) having a nozzle which discharges the ink fed from the second ink tank (3) on the object to be printed; a deaeration module (4) arranged between the second ink tank (3) and the print head (5) to remove air bubbles in the ink; and a recycle flow path for returning the unused ink discharged from a nozzle of the print head (5) to the second ink tank (3).

Description

インクジェット捺染装置Inkjet printing device
　本発明は、インクジェット捺染装置に関するものである。 The present invention relates to an inkjet printing apparatus.
　従来、布帛などの被捺染物にインクを吐出して捺染を行うインクジェット捺染装置が提案されている。このインクジェット捺染装置では、プリントヘッドのノズルからインクを吐出しているが、ノズルにインクが残存して乾燥することで、そのノズルに残存したインクの粘度が上昇してノズルが目詰まりを起こすことがある。このように粘度が上昇したインクをプリントヘッドのノズルから取り除くために、吸引ポンプなどで強制的にノズル内のインクを取り除く、いわゆる空吐出動作が定期的に行われている（例えば、特許文献１）。 2. Description of the Related Art Conventionally, an ink jet printing apparatus that performs printing by discharging ink onto a material to be printed such as a cloth has been proposed. In this ink jet textile printing apparatus, ink is ejected from the nozzles of the print head, but when ink remains in the nozzles and dries, the viscosity of the ink remaining in the nozzles increases and the nozzles become clogged. There is. In order to remove the ink whose viscosity has increased in this way from the nozzles of the print head, a so-called idle ejection operation in which ink in the nozzles is forcibly removed by a suction pump or the like is periodically performed (for example, Patent Document 1). ).
特開平７－２４６７１０号公報JP 7-246710 A
　しかしながら、上述したような空吐出動作等によって吐出されるインクは使用されずに廃棄されており、未使用のインクが無駄に使用されているという問題があった。そこで、本発明は、空吐出動作等により吐出された未使用のインクを有効に利用することのできるインクジェット捺染装置を提供することを課題とする。 However, there is a problem that ink ejected by the above-described empty ejection operation or the like is discarded without being used, and unused ink is wasted. Therefore, an object of the present invention is to provide an ink jet textile printing apparatus that can effectively use unused ink ejected by an idle ejection operation or the like.
　本発明に係るインクジェット捺染装置は、被捺染物にインクを吐出して捺染するインクジェット捺染装置であって、インクを貯留する第1のインクタンクと、前記第１のインクタンクから供給されるインクを貯留する第２のインクタンクと、前記第２のインクタンクから供給されたインクを被捺染物に吐出するノズルを有するプリントヘッドと、前記第２のインクタンクと前記プリントヘッドとの間に設置され、インク中の気泡を除去する脱気手段と、前記プリントヘッドのノズルから吐出された未使用のインクを前記第２のインクタンクに戻すリサイクル流路と、を備えている。 An inkjet printing apparatus according to the present invention is an inkjet printing apparatus that performs printing by ejecting ink onto a material to be printed, and includes a first ink tank that stores ink, and ink that is supplied from the first ink tank. A second ink tank to be stored; a print head having a nozzle for discharging the ink supplied from the second ink tank to a printed material; and the second ink tank disposed between the second ink tank and the print head. And a degassing means for removing bubbles in the ink, and a recycle flow path for returning unused ink ejected from the nozzles of the print head to the second ink tank.
　上記インクジェット捺染装置によれば、ノズルの目詰まりを防止する空吐出動作などによってプリントヘッドのノズルから吐出された未使用のインクを第２のインクタンクに戻すためのリサイクル流路を備えているため、空吐出動作などによって吐出された未使用のインクを有効に利用することができる。また、このようにリサイクルされたインクは、気泡などを含んでいることがあるが、本発明に係る第２のインクタンクとプリントヘッドとの間には脱気手段が設置されているため、気泡を含まないインクをプリントヘッドに供給することができる。さらには、脱気手段が第２のインクタンクとプリントヘッドとの間に設置されているため、第２のインクタンクを、インクが大気と接触するような開放型のインクタンクとすることができる。 According to the ink jet textile printing apparatus, the ink jet printing apparatus includes the recycling flow path for returning unused ink ejected from the nozzles of the print head to the second ink tank by an idle ejection operation for preventing clogging of the nozzles. In addition, it is possible to effectively use unused ink ejected by an idle ejection operation or the like. The ink recycled in this way may contain bubbles or the like. However, since deaeration means is installed between the second ink tank and the print head according to the present invention, Ink can be supplied to the printhead. Furthermore, since the deaeration means is installed between the second ink tank and the print head, the second ink tank can be an open type ink tank in which the ink contacts the atmosphere. .
　上記インクジェット捺染装置は種々の構成をとることができるが、例えば、上記脱気手段におけるインクの圧力損失が０．１ｋPa以下であることが好ましい。これにより、第２インクタンクからプリントヘッドまでの抵抗を減少させて、水頭方式によるインクの供給をスムーズに行うことができる。また、同様の理由で、脱気手段を外部灌流型とすることが好ましい。 The ink-jet textile printing apparatus can take various configurations. For example, it is preferable that the pressure loss of the ink in the deaeration means is 0.1 kPa or less. As a result, the resistance from the second ink tank to the print head can be reduced, and ink can be supplied smoothly by the water head method. For the same reason, the deaeration means is preferably an external perfusion type.
　また、上記第１のインクタンク、第２のインクタンク、及び脱気手段が、この順で直列に接続することができる。このように構成することで、第１のインクタンクも開放型のインクタンクとすることができる。 Further, the first ink tank, the second ink tank, and the deaeration means can be connected in series in this order. With this configuration, the first ink tank can also be an open ink tank.
　また、加圧されたインクをプリントヘッドのノズルに供給するインク加圧ポンプをさらに備えることが好ましい。このインク加圧ポンプによれば、プリントヘッドのノズル内のインクを強制的に排出し、ノズルの目詰まりを確実に防止することができる。 In addition, it is preferable to further include an ink pressurizing pump that supplies pressurized ink to the nozzles of the print head. According to this ink pressurizing pump, the ink in the nozzles of the print head can be forcibly discharged, and nozzle clogging can be reliably prevented.
　また、プリントヘッドのノズル内のインクを強制的に排出するために、プリントヘッドのノズル内のインクを吸引する吸引ポンプをさらに備えることが好ましい。 In order to forcibly discharge the ink in the nozzles of the print head, it is preferable to further include a suction pump that sucks the ink in the nozzles of the print head.
　本発明に係るインクジェット捺染装置によれば、空吐出動作等により吐出された未使用のインクを有効に利用することができる。 According to the ink jet textile printing apparatus according to the present invention, it is possible to effectively use unused ink ejected by an idle ejection operation or the like.
図１は本実施形態に係るインクジェット捺染装置の概略図である。FIG. 1 is a schematic view of an inkjet printing apparatus according to the present embodiment. 図２は本実施形態に係る脱気モジュールの一部断面図であるFIG. 2 is a partial cross-sectional view of the deaeration module according to the present embodiment.
　以下、本発明に係るインクジェット捺染装置の実施形態について図面を参照しつつ説明する。 Hereinafter, embodiments of an ink jet textile printing apparatus according to the present invention will be described with reference to the drawings.
　図１に示すように、インクジェット捺染装置１は、第１のインクタンク２内に貯留されたインクが第２のインクタンク３に供給されて第２のインクタンク３内に一時的に貯留される。そして、この第２のインクタンク３内のインクが脱気モジュール４で脱気された後、プリントヘッド５に供給され、プリントヘッド５が被捺染物にインクを吐出することで捺染を行う。また、インクジェット捺染装置１は、プリントヘッド５のノズル目詰まりを防止するための目詰まり防止手段として、サクションパッド６及びサクションポンプＰ１や、インク加圧ポンプＰ２をさらに備えており、また、これら目詰まり防止手段によってプリントヘッド５から空吐出動作により吐出された未使用のインク内のゴミなどを除去するためのフィルターユニット７も備えている。 As shown in FIG. 1, the ink jet textile printing apparatus 1 has the ink stored in the first ink tank 2 supplied to the second ink tank 3 and temporarily stored in the second ink tank 3. . Then, after the ink in the second ink tank 3 is deaerated by the deaeration module 4, the ink is supplied to the print head 5, and printing is performed by the print head 5 ejecting ink onto the object to be printed. The inkjet textile printing apparatus 1 further includes a suction pad 6, a suction pump P1, and an ink pressure pump P2 as clogging prevention means for preventing clogging of the nozzles of the print head 5. A filter unit 7 is also provided for removing dust and the like in unused ink ejected from the print head 5 by the idle ejection operation by the clogging prevention means.
　第１のインクタンク２は、第２のインクタンク３に供給するためのインクを貯留する開放型のインクタンクである。第１のインクタンク２内のインクがなくなったときは、新たな第１のインクタンク２に取り替えるように構成されているが、第１のインクタンク２内にインクを補充することもできる。なお、この第１のインクタンク２は開放型となっているが、インクを大気と接触させない構造の密閉型とすることもできる。また、第１のインクタンク２の容量は特に限定されるものではないが、一般的には、約５～１０Lである。 The first ink tank 2 is an open type ink tank that stores ink to be supplied to the second ink tank 3. When the ink in the first ink tank 2 runs out, the first ink tank 2 is replaced with a new one. However, the first ink tank 2 can be replenished with ink. Although the first ink tank 2 is an open type, it may be a sealed type having a structure that does not allow ink to come into contact with the atmosphere. The capacity of the first ink tank 2 is not particularly limited, but is generally about 5 to 10 L.
　第２のインクタンク３は、インク供給ポンプＰ３や三方弁Ｖ１を介して第１のインクタンク２と接続されている。この第２のインクタンク３は、第１のインクタンク２から供給されたインクや、空吐出動作によって吐出されたインクを一時的に貯留する開放型のインクタンクであり、水頭方式によってプリントヘッド５へインクを供給している。第２のインクタンク３には、水頭を制御するためにインクの液面を検出する液面検出センサ３１が設置されている。捺染によって第２のインクタンク３内に貯留されたインクの液面が設定値よりも下がったことを液面検出センサ３１が検出すると、インク供給ポンプＰ３を作動させて第１のインクタンク２から第２のインクタンク３へとインクが供給される。なお、この第２のインクタンク３は、開放型となっているが、密閉型とすることもできる。また、この第２のインクタンク３は、上述した第１のインクタンク２よりもその容量が小さく、一般的には約７０～１００ｍLである。 The second ink tank 3 is connected to the first ink tank 2 via an ink supply pump P3 and a three-way valve V1. The second ink tank 3 is an open type ink tank that temporarily stores the ink supplied from the first ink tank 2 and the ink discharged by the idle discharge operation, and the print head 5 is formed by a water head method. Ink is being supplied. The second ink tank 3 is provided with a liquid level detection sensor 31 for detecting the ink level in order to control the water head. When the liquid level detection sensor 31 detects that the liquid level of the ink stored in the second ink tank 3 has fallen below the set value due to printing, the ink supply pump P3 is activated to remove the ink level from the first ink tank 2. Ink is supplied to the second ink tank 3. The second ink tank 3 is an open type, but may be a sealed type. The second ink tank 3 has a smaller capacity than the first ink tank 2 described above, and is generally about 70 to 100 mL.
　脱気モジュール４は、第２のインクタンク３とプリントヘッド５との間に設置されており、第２のインクタンク３からプリントヘッド５へと送られるインク中に存在する気泡を除去するための装置である。より詳細には、図２に示すように、脱気モジュール４は、外部灌流型であって、中空状の筒状体４１内に複数本の中空糸４２が収容されており、各中空糸４２内を減圧するために、各中空糸４２の上端及び下端の少なくとも一方には真空ポンプＰ４が接続されている。この脱気モジュール４では、筒状体４１内に送られたインクは、中空糸４２の外部を流れて脱気される構成となっている。具体的には、供給口４３を介して第２のインクタンク３から筒状体４１内に送られたインクは、筒状体４１の中央に送られて半径方向外側へと向かう途中で、各中空糸４２の外側面と接触することでインク中に含まれる気泡が各中空糸４２内に吸引されている。そして、脱気されたインクは、排出口４４を介して筒状体４１から排出され、プリントヘッド５に送られている。この脱気モジュール４におけるインクの圧力損失は、０．１ｋＰａ以下とすることが好ましい。なお、真空ポンプP４が本発明の減圧手段に相当する。 The deaeration module 4 is installed between the second ink tank 3 and the print head 5, and removes bubbles present in the ink sent from the second ink tank 3 to the print head 5. Device. More specifically, as shown in FIG. 2, the deaeration module 4 is an external perfusion type, and a plurality of hollow fibers 42 are accommodated in a hollow cylindrical body 41. In order to depressurize the inside, a vacuum pump P4 is connected to at least one of the upper end and the lower end of each hollow fiber 42. In the deaeration module 4, the ink sent into the cylindrical body 41 is configured to flow out of the hollow fiber 42 and be deaerated. Specifically, the ink sent from the second ink tank 3 into the cylindrical body 41 through the supply port 43 is sent to the center of the cylindrical body 41 and goes to the outside in the radial direction. Air bubbles contained in the ink are sucked into each hollow fiber 42 by contacting the outer surface of the hollow fiber 42. The deaerated ink is discharged from the cylindrical body 41 through the discharge port 44 and sent to the print head 5. The pressure loss of ink in the deaeration module 4 is preferably 0.1 kPa or less. The vacuum pump P4 corresponds to the decompression means of the present invention.
　プリントヘッド５は、脱気モジュール４を介して第２のインクタンク３から送られたインクを被捺染物に吐出するものであり、複数のノズルを有する公知のプリントヘッドを用いることができる。このプリントヘッド５と脱気モジュール４との間には、２つの三方弁Ｖ２，Ｖ３と、この三方弁Ｖ２，Ｖ３の間に設置されたピンチバルブＶ４と、インク加圧ポンプＰ２と、が設置されている。なお、インク加圧ポンプＰ２は、プリントヘッド５と脱気モジュール４とを接続する流路に各三方弁Ｖ２，Ｖ３を介して接続されている。捺染時はピンチバルブＶ４が開状態になっており、第２のインクタンク３からのインクは、インク加圧ポンプＰ２を経由せずに、各三方弁Ｖ２，Ｖ３及びピンチバルブＶ４を介してプリントヘッド５に送られる。一方、プリントヘッド５のノズルの目詰まりを防止するために、加圧されたインクをプリントヘッド５のノズルへと送る際は、ピンチバルブＶ４を閉状態にする。これにより第２のインクタンク３からのインクが各三方弁Ｖ２，Ｖ３を介してインク加圧ポンプＰ２に送られ、高圧となったインクがプリントヘッド５のノズルに送られて、ノズル内のインクを強制的に排出し、ノズルの目詰まりを防止する。なお、インク加圧ポンプＰ２によって排出されたインクは、後述するサクションパッド６に排出される。 The print head 5 discharges ink sent from the second ink tank 3 via the deaeration module 4 to the object to be printed, and a known print head having a plurality of nozzles can be used. Between the print head 5 and the deaeration module 4, two three-way valves V2 and V3, a pinch valve V4 installed between the three-way valves V2 and V3, and an ink pressurizing pump P2 are installed. Has been. The ink pressurizing pump P2 is connected to a flow path connecting the print head 5 and the deaeration module 4 via the three-way valves V2 and V3. At the time of printing, the pinch valve V4 is in an open state, and ink from the second ink tank 3 is printed via the three-way valves V2, V3 and the pinch valve V4 without passing through the ink pressurizing pump P2. It is sent to the head 5. On the other hand, in order to prevent clogging of the nozzles of the print head 5, when the pressurized ink is sent to the nozzles of the print head 5, the pinch valve V4 is closed. As a result, the ink from the second ink tank 3 is sent to the ink pressurizing pump P2 via the three-way valves V2 and V3, and the high-pressure ink is sent to the nozzles of the print head 5, and the ink in the nozzles Is forcibly discharged to prevent nozzle clogging. The ink discharged by the ink pressurizing pump P2 is discharged to a suction pad 6 described later.
　また、プリントヘッド５のノズル目詰まりを解消するための手段として、サクションパッド６及びサクションポンプＰ１が設置されている。サクションパッド６は、プリントヘッド５のノズルが形成されたノズル面を密閉するように構成されている。このサクションパッド６でプリントヘッド５のノズル面を密閉した状態でサクションポンプＰ１を作動させることで、プリントヘッド５のノズル内のインクは強制的に吸引されてサクションパッド６に排出される。なお、サクションパッド６は、捺染時はプリントヘッド５から取り外されている。また、サクションパッド６は、プリントヘッド５のノズルを覆うことで、ノズル内のインクが乾燥することを防ぐキャップとしての役割も兼用することができる。また、サクションパッド６にはインク排出用チューブ６１が接続されており、このインク排出用チューブ６１に設置された開閉バルブなどの開閉手段（図示省略）を閉状態にすると上述したようにプリントヘッド５のノズル内のインクを吸引し、開閉手段を開状態にするとプリントヘッド５のノズル内のインクは吸引せずにサクションパッド６内のインクのみを吸引するように構成されている。また、サクションパッド６から、第２のインクタンク３までの流路が本発明のリサイクル流路に相当する。 Further, a suction pad 6 and a suction pump P1 are installed as means for eliminating nozzle clogging of the print head 5. The suction pad 6 is configured to seal the nozzle surface on which the nozzles of the print head 5 are formed. By operating the suction pump P <b> 1 with the suction pad 6 sealing the nozzle surface of the print head 5, the ink in the nozzles of the print head 5 is forcibly sucked and discharged to the suction pad 6. The suction pad 6 is removed from the print head 5 at the time of textile printing. Moreover, the suction pad 6 can also serve as a cap that prevents the ink in the nozzles from drying by covering the nozzles of the print head 5. Further, an ink discharge tube 61 is connected to the suction pad 6, and when the open / close means (not shown) such as an open / close valve installed in the ink discharge tube 61 is closed, the print head 5 is as described above. When the ink in the nozzles is sucked and the opening / closing means is opened, the ink in the nozzles of the print head 5 is not sucked but only the ink in the suction pad 6 is sucked. The flow path from the suction pad 6 to the second ink tank 3 corresponds to the recycle flow path of the present invention.
　サクションパッド６に排出されたインクは、フィルターユニット７やチェック弁Ｖ５、三方弁Ｖ１を介して第２のインクタンク３へと戻される。このフィルターユニット７を経由することで、インク中のゴミなどが除去される。また、チェック弁Ｖ５が設置されているために、インクの逆流を防止することができ、第１のインクタンク２から第２のインクタンク３へと送られるインクがフィルターユニット７側へと送られることが防止される。なお、サクションパッド６に排出されたインクを第２のインクタンク３に戻す際は、インク供給ポンプＰ３は停止している。 The ink discharged to the suction pad 6 is returned to the second ink tank 3 through the filter unit 7, the check valve V5, and the three-way valve V1. By passing through the filter unit 7, dust and the like in the ink are removed. In addition, since the check valve V5 is provided, it is possible to prevent the backflow of ink, and the ink sent from the first ink tank 2 to the second ink tank 3 is sent to the filter unit 7 side. It is prevented. When the ink discharged to the suction pad 6 is returned to the second ink tank 3, the ink supply pump P3 is stopped.
　以上、本発明の実施形態について説明したが、本発明はこれらに限定されるものではなく、本発明の趣旨を逸脱しない限りにおいて種々の変更が可能である。例えば、上記実施形態では、プリントヘッド５のノズル目詰まり防止手段として、サクションパッド６及びサクションポンプＰ１からなる吸引手段と、インク加圧ポンプＰ２からなる加圧手段の２つの目詰まり防止手段を用いているが、どちらか一方の目詰まり防止手段のみでもよい。 As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the above-described embodiment, two clogging prevention means including a suction means including the suction pad 6 and the suction pump P1 and a pressurization means including the ink pressure pump P2 are used as the nozzle clogging prevention means of the print head 5. However, only one of the clogging prevention means may be used.
　１　　インクジェット捺染装置
　２　　第１のインクタンク
　３　　第２のインクタンク
　４　　脱気モジュール（脱気手段）
　５　　プリントヘッド
　Ｐ１　吸引ポンプ
　Ｐ２　インク加圧ポンプ DESCRIPTION OF SYMBOLS 1 Inkjet textile printing apparatus 2 1st ink tank 3 2nd ink tank 4 Deaeration module (deaeration means)
5 Print head P1 Suction pump P2 Ink pressurizing pump

Claims (7)

  1. 　被捺染物にインクを吐出して捺染するインクジェット捺染装置であって、
    　インクを貯留する第１のインクタンクと、
    　前記第１のインクタンクから供給されるインクを貯留する第２のインクタンクと、
    　前記第２のインクタンクから供給されたインクを被捺染物に吐出するノズルを有するプリントヘッドと、
    　前記第２のインクタンクと前記プリントヘッドとの間に設置され、インク中の気泡を除去する脱気手段と、
    　前記プリントヘッドのノズルから吐出された未使用のインクを前記第２のインクタンクに戻すリサイクル流路と、
    を備えた、インクジェット捺染装置。     An inkjet printing apparatus for printing by discharging ink onto a material to be printed,
    A first ink tank for storing ink;
    A second ink tank for storing ink supplied from the first ink tank;
    A print head having a nozzle for discharging the ink supplied from the second ink tank to a printed material;
    A deaeration unit that is installed between the second ink tank and the print head and removes bubbles in the ink;
    A recycling flow path for returning unused ink ejected from the nozzles of the print head to the second ink tank;
    An inkjet printing apparatus comprising:
  2. 　前記脱気手段は、前記第２のインクタンクから内部にインクが送られる筒状体と、前記筒状体内に設けられた複数本の中空糸と、前記各中空糸内を減圧する減圧手段と、を有する、請求項１に記載のインクジェット捺染装置。 The deaeration means includes a cylindrical body through which ink is sent from the second ink tank, a plurality of hollow fibers provided in the cylindrical body, and a decompression means that depressurizes the hollow fibers. The inkjet printing apparatus according to claim 1, comprising:
  3. 　前記脱気手段におけるインクの圧力損失が０．１ｋPa以下である、請求項１又は２に記載のインクジェット捺染装置。 The ink jet printing apparatus according to claim 1 or 2, wherein the pressure loss of the ink in the deaeration means is 0.1 kPa or less.
  4. 　前記第１のインクタンク、第２のインクタンク、及び脱気手段が、この順で直列に接続されている、請求項１から３のいずれかに記載のインクジェット捺染装置。 The ink jet printing apparatus according to any one of claims 1 to 3, wherein the first ink tank, the second ink tank, and the deaeration means are connected in series in this order.
  5. 　前記第１のインクタンク及び第２のインクタンクの少なくとも一方は、開放型である、請求項１から４のいずれかに記載のインクジェット捺染装置。 The inkjet printing apparatus according to any one of claims 1 to 4, wherein at least one of the first ink tank and the second ink tank is an open type.
  6. 　加圧されたインクを前記プリントヘッドのノズルに供給するインク加圧ポンプをさらに備えた、請求項１から５のいずれかに記載のインクジェット捺染装置。 6. The ink jet printing apparatus according to claim 1, further comprising an ink pressurizing pump that supplies pressurized ink to the nozzles of the print head.
  7. 　前記プリントヘッドのノズル内のインクを吸引する吸引ポンプをさらに備えた、請求項１から６のいずれかに記載のインクジェット捺染装置。 The inkjet printing apparatus according to any one of claims 1 to 6, further comprising a suction pump that sucks ink in the nozzles of the print head.
PCT/JP2011/078675 2011-01-24 2011-12-12 Inkjet printing device WO2012101918A1 (en)

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