JP4667153B2 - Cleaning device - Google Patents

Cleaning device Download PDF

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JP4667153B2
JP4667153B2 JP2005222439A JP2005222439A JP4667153B2 JP 4667153 B2 JP4667153 B2 JP 4667153B2 JP 2005222439 A JP2005222439 A JP 2005222439A JP 2005222439 A JP2005222439 A JP 2005222439A JP 4667153 B2 JP4667153 B2 JP 4667153B2
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cleaning
solvent
cleaning container
ink
discharge
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JP2007038430A (en
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寛人 内田
真朗 村田
充 矢作
進 崎尾
日出夫 竹井
功二 羽根
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Ulvac Inc
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Ulvac Inc
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本発明はインクジェットプリンタの印刷ヘッドを洗浄する洗浄装置に関する。   The present invention relates to a cleaning device for cleaning a print head of an inkjet printer.

従来より、液晶表示素子のカラーフィルター、スペーサー、配向膜、有機ＥＬ表示素子の発光層、プラズマ表示素子の配線等、ＦＰＤ分野の製造、実装配線基板の製造等にはインクジェットプリンタが用いられている。   Conventionally, inkjet printers have been used for manufacturing FPD fields, mounting wiring boards, etc., such as color filters for liquid crystal display elements, spacers, alignment films, light emitting layers for organic EL display elements, wiring for plasma display elements, etc. .

インクジェットプリンタは、吐出口が設けられたノズルプレートを有し、該吐出口からインクを吐出することで印刷を行うが、吐出口の周囲にインクが多量に付着したり、吐出口内のインクに気泡が入り込むと、インクが吐出口から吐出されなくなるという問題がある。   An ink jet printer has a nozzle plate provided with ejection openings, and performs printing by ejecting ink from the ejection openings. However, a large amount of ink adheres to the periphery of the ejection openings, or bubbles are formed in the ink in the ejection openings. When the ink enters, there is a problem that ink is not discharged from the discharge port.

このような問題を解決するために、従来技術でも対策が模索され、例えばノズルプレートの表面をブラシで擦り、吐出口周囲に付着したインクを除去する接触方式が提案されている。   In order to solve such problems, countermeasures have been sought in the prior art as well, for example, a contact method has been proposed in which the surface of the nozzle plate is rubbed with a brush to remove ink adhering to the periphery of the ejection port.

しかし、吐出口の周囲には液状のインクだけではなく、インクが乾燥して溶剤が除去された後の析出物が付着していることがある。上記接触方式では、液状のインクは除去されるが、インクが乾燥して溶剤が除去された後に残る析出物は除去できず、析出物を除去するためにはブラシでノズルプレートを強く擦る必要がある。ブラシでノズルプレートを強く擦るとノズルプレートが傷つけられたり、ノズルプレートの溌液処理がダメージを受け、ノズルプレート表面に液だまりが出来やすくなりインクの吐出角度のバラツキが出る。   However, not only liquid ink but also deposits after the ink is dried and the solvent is removed may adhere to the periphery of the ejection port. In the above contact method, the liquid ink is removed, but the precipitate remaining after the ink is dried and the solvent is removed cannot be removed. To remove the deposit, it is necessary to rub the nozzle plate strongly with a brush. is there. If the nozzle plate is rubbed strongly with a brush, the nozzle plate will be damaged, or the liquid-repellent treatment of the nozzle plate will be damaged, resulting in liquid pooling on the surface of the nozzle plate and variations in the ink discharge angle.

洗浄液をノズルプレートに噴きつける方法も提案されているが、この方法ではインクや析出物を取り除くことはできるが、吐出口内のインクに入り込んだ気泡を除去することはできない。また、この方法では洗浄液が吐出口の内部に多量に入り込む恐れがあり、洗浄液が多量に入りこむと吐出口内のインクの組成が変わり、インクの吐出が不安定になる。
特開昭６１−１９３８５７ 特開平４−３９０５５ 特開平１−２１０３５０ A method of spraying the cleaning liquid onto the nozzle plate has also been proposed, but this method can remove ink and deposits, but cannot remove bubbles that have entered the ink in the ejection port. Further, in this method, there is a possibility that a large amount of the cleaning liquid enters the inside of the discharge port. When the cleaning liquid enters a large amount, the composition of the ink in the discharge port changes, and the ink discharge becomes unstable.
JP 61-193857 A JP-A-4-39055 JP-A-1-210350

本発明は上記課題を解決するためになされたものであり、その目的はノズルプレートを洗浄し、かつ気泡の除去も可能な洗浄装置を提供することである。   The present invention has been made to solve the above problems, and an object of the present invention is to provide a cleaning apparatus that can clean a nozzle plate and remove bubbles.

上記課題を解決するために請求項１記載の発明は、インクを吐出可能な吐出口を有する印刷ヘッドの、前記吐出口が設けられた吐出面を洗浄する洗浄装置であって、開口の大きさが前記吐出面よりも小さく、前記開口の周囲が前記吐出面と接触可能な洗浄容器を有し、前記洗浄容器は前記吐出面を前記開口の周囲に接触させた時に密閉されるように構成され、前記洗浄容器には、密閉された前記洗浄容器の内部を排気して前記洗浄容器内の圧力を低下させる排気ポンプと、前記洗浄容器内の圧力が低下すると、前記洗浄容器内に位置するノズルから、溶剤を前記吐出面に向かって噴出する溶剤噴出系と、前記洗浄容器に溜まった前記溶剤とを排出する排出系と、が設けられ、前記排気ポンプは、前記洗浄容器の底壁に溜まった前記溶剤に浸漬されない位置に配置された排気管の端部から、前記洗浄容器の内部の気体を排気するように構成された洗浄装置である。
請求項２記載の発明は請求項１記載の洗浄装置であって、前記溶剤噴出系は、溶剤が収容されたタンクと、一端が前記タンク内で前記溶剤に浸漬され、他端が前記洗浄容器内に挿入された供給管とを有し、前記洗浄容器内を排気し、前記洗浄容器内の圧力が下がると、前記タンク内の前記溶剤が前記供給管を通って前記洗浄容器内に引き込まれる洗浄装置である。
請求項３記載の発明は請求項１又は請求項２のいずれか１項記載の洗浄装置であって、前記洗浄容器の外部に設けられた清掃体を有し、前記清掃体は、前記吐出面に接触して前記吐出面に付着した液体を除去するように構成された洗浄装置である。
請求項４記載の発明は、請求項１乃至請求項３のいずれか１項記載の洗浄装置であって、前記溶剤噴出系は、前記溶剤を前記吐出面に向かって噴出するときに、前記印刷ヘッドの前記吐出口の周囲に、前記溶剤を吹き付ける洗浄装置である。
In order to solve the above-mentioned problem, the invention described in claim 1 is a cleaning device for cleaning an ejection surface of a print head having an ejection port capable of ejecting ink and provided with the ejection port, the size of the opening. Has a cleaning container that is smaller than the discharge surface, and the periphery of the opening can contact the discharge surface, and the cleaning container is configured to be sealed when the discharge surface is brought into contact with the periphery of the opening. The cleaning container includes an exhaust pump that exhausts the inside of the sealed cleaning container to reduce the pressure in the cleaning container, and a nozzle located in the cleaning container when the pressure in the cleaning container decreases. A solvent ejection system for ejecting the solvent toward the discharge surface and a discharge system for discharging the solvent accumulated in the cleaning container, and the exhaust pump is accumulated on the bottom wall of the cleaning container. Soaked in the solvent From the end of the arranged exhaust pipe at a position not a configured cleaning apparatus so as to exhaust the gas inside of the cleaning vessel.
Invention of Claim 2 is the washing | cleaning apparatus of Claim 1, Comprising: The said solvent ejection system is a tank in which the solvent was accommodated, one end is immersed in the said solvent in the said tank, and the other end is the said washing | cleaning container And when the pressure in the cleaning container is reduced, the solvent in the tank is drawn into the cleaning container through the supply pipe. It is a cleaning device.
Invention of Claim 3 is a washing | cleaning apparatus of any one of Claim 1 or Claim 2, Comprising: It has the cleaning body provided in the exterior of the said washing | cleaning container, The said cleaning body is the said discharge surface The cleaning device is configured to remove the liquid adhering to the ejection surface in contact with the liquid.
Invention of Claim 4 is a washing | cleaning apparatus of any one of Claim 1 thru | or 3, Comprising : The said solvent ejection system is said printing when ejecting the said solvent toward the said discharge surface. In the cleaning device, the solvent is sprayed around the discharge port of the head.

本発明は上記のように構成されており、印刷ヘッドの内部にはインクを吐出していない時もインクが保持され、吐出面を洗浄容器に接触させると吐出口を介して印刷ヘッド内のインクが洗浄容器の内部に露出する。   The present invention is configured as described above, and the ink is retained inside the print head even when ink is not ejected. When the ejection surface is brought into contact with the cleaning container, the ink in the print head is ejected through the ejection port. Is exposed inside the cleaning container.

印刷ヘッド内の吐出口近傍にはピエゾ素子のような吐出素子が設けられており、印刷の時は吐出素子が吐出のタイミングや吐出量を制御するが、通常の吐出では印刷ヘッド内の気泡を除去することができない。   A discharge element such as a piezo element is provided near the discharge port in the print head. During printing, the discharge element controls the discharge timing and discharge amount. It cannot be removed.

洗浄容器を密閉して洗浄容器内を排気し、その内部圧力を低くすれば印刷ヘッド内のインクは吐出口から洗浄容器内に吸い込まれる。内部圧力を低くすればする程インクが吸い込まれる量が多くなり、吐出だけでは除去されない気泡を取り除くことができる。   If the cleaning container is sealed and the cleaning container is evacuated and the internal pressure is lowered, the ink in the print head is sucked into the cleaning container from the discharge port. The lower the internal pressure, the greater the amount of ink that is sucked in, and bubbles that cannot be removed only by ejection can be removed.

印刷ヘッドを洗浄装置で洗浄する前に吐出面に付着したインクを清掃体で拭えば、吐出面の洗浄に要する時間が短縮される。   If the ink adhering to the discharge surface is wiped with a cleaning body before the print head is cleaned by the cleaning device, the time required for cleaning the discharge surface is shortened.

また、洗浄後、印刷を再開する前に吐出面を清掃体で拭えば、洗浄工程で吐出面に付着した過剰な溶剤が除去され、印刷を開始した時に吐出口からのインクの吐出が安定する。   In addition, if the discharge surface is wiped with a cleaning body after cleaning and before resuming printing, excess solvent adhering to the discharge surface is removed in the cleaning process, and ink discharge from the discharge port is stabilized when printing is started. .

本発明の洗浄装置は、吐出面に付着したインクを除去するだけではなく、印刷ヘッド内のインクから気泡を除去できるので、洗浄後の印刷は安定して行われる。また、洗浄後、洗浄容器を密閉した状態を維持すれば、長時間印刷を行わなくても印刷ヘッド内のインクが乾かない。
また、インクから気泡が除去され、吐出面から付着物が除去された後、溶剤の噴出を続けながら、排出系へ溶剤を排出するのを止め、洗浄容器に溶剤を溜めた後、排気ポンプのバルブを閉じて排気を停止し、溶剤の噴出とインクの吸い込みを停止させて洗浄容器が密閉された状態を維持すると、洗浄容器に溜まった溶剤が蒸発して飽和状態となる。
吐出口は溶剤の飽和蒸気に晒され、印刷ヘッド内のインクから溶剤が蒸発する量は平衡状態になるのでインクは乾燥せず、吐出口付近のインクの粘度は上昇しない。
The cleaning device of the present invention not only removes ink adhering to the ejection surface but also removes bubbles from the ink in the print head, so printing after washing is performed stably. Further, if the cleaning container is kept sealed after cleaning, the ink in the print head does not dry even if printing is not performed for a long time.
In addition, after the bubbles are removed from the ink and the deposits are removed from the ejection surface, the solvent is continuously ejected and the solvent is stopped from being discharged into the discharge system. When the valve is closed and the exhaust is stopped, the ejection of the solvent and the suction of the ink are stopped, and the cleaning container is kept sealed, the solvent accumulated in the cleaning container evaporates and becomes saturated.
Since the discharge port is exposed to the saturated vapor of the solvent and the amount of solvent evaporation from the ink in the print head is in an equilibrium state, the ink is not dried and the viscosity of the ink near the discharge port does not increase.

図１の符号１は本発明の印刷装置の一例を示しており、この印刷装置１は印刷部１０と、洗浄部（洗浄装置）２０とを有している。   Reference numeral 1 in FIG. 1 shows an example of the printing apparatus of the present invention. The printing apparatus 1 includes a printing unit 10 and a cleaning unit (cleaning device) 20.

印刷部１０は、台１１と、１又は複数個の印刷ヘッド１４とを有している（図２（ａ））。各印刷ヘッド１４の一面には１又は複数の吐出口１７がそれぞれ設けられている。図２の符号１６は印刷ヘッド１４の吐出口１７が設けられた面（吐出面）を示しており、各印刷ヘッド１４は吐出面１６を台１１側に向けて台１１上の保持体１３に取り付けられている。   The printing unit 10 includes a table 11 and one or a plurality of print heads 14 (FIG. 2A). One or a plurality of discharge ports 17 are provided on one surface of each print head 14. Reference numeral 16 in FIG. 2 indicates a surface (discharge surface) on which the discharge ports 17 of the print head 14 are provided. Each print head 14 faces the holder 13 on the table 11 with the discharge surface 16 facing the table 11 side. It is attached.

洗浄部２０は筐体３１を有している。筐体３１は台１１の側方に台１１と離間して配置されており、筐体３１の上部表面には、開口４２を上に向けた状態で洗浄容器４１が取り付けられている。   The cleaning unit 20 has a housing 31. The casing 31 is disposed on the side of the base 11 and spaced apart from the base 11, and a cleaning container 41 is attached to the upper surface of the casing 31 with the opening 42 facing upward.

保持体１３は不図示の移動手段によって台１１上と、筐体３１上との間を移動可能にされており、保持体１３を移動させると各印刷ヘッド１４も一緒に移動する。   The holding body 13 is movable between the table 11 and the housing 31 by a moving means (not shown). When the holding body 13 is moved, the print heads 14 are also moved together.

洗浄容器４１の並びや間隔は印刷ヘッド１４の並びや間隔と一致している。例えば、図２（ａ）に示すように複数の印刷ヘッド１４が千鳥状に並べられているときには、洗浄容器４１も千鳥状に並べられ、保持体１３を筐体３１上に移動させ、位置合わせすると、図２（ｂ）に示すように各洗浄容器４１の開口４２上に印刷ヘッド１４を１つずつ静止させられるように構成されている。   The arrangement and interval of the cleaning containers 41 coincide with the arrangement and interval of the print heads 14. For example, when a plurality of print heads 14 are arranged in a zigzag pattern as shown in FIG. 2A, the cleaning containers 41 are also arranged in a zigzag pattern, and the holding body 13 is moved onto the casing 31 for alignment. Then, as shown in FIG. 2B, the print heads 14 are configured to be stationary one by one on the openings 42 of the respective cleaning containers 41.

図３（ａ）は洗浄容器４１の模式的な拡大断面図であり、洗浄容器４１又は筐体３１には、洗浄容器４１の開口４２を取り囲むリング状の密閉部材４３が取り付けられている。   FIG. 3A is a schematic enlarged cross-sectional view of the cleaning container 41, and a ring-shaped sealing member 43 surrounding the opening 42 of the cleaning container 41 is attached to the cleaning container 41 or the casing 31.

密閉部材４３の外周は吐出面１６の外周よりも小さく、位置合わせ後、印刷ヘッド１４を下降させると、吐出面１６の縁部分が密閉部材４３と接触する。密閉部材４３の内周は吐出口１７が並べられた領域よりも大きく、吐出面１６の縁部分が密閉部材４３と接触した時に、各吐出口１７は密閉部材４３の内側で開口４２と対面するようになっている。   The outer periphery of the sealing member 43 is smaller than the outer periphery of the ejection surface 16, and the edge portion of the ejection surface 16 comes into contact with the sealing member 43 when the print head 14 is lowered after alignment. The inner periphery of the sealing member 43 is larger than the region where the discharge ports 17 are arranged, and each discharge port 17 faces the opening 42 inside the sealing member 43 when the edge portion of the discharge surface 16 contacts the sealing member 43. It is like that.

洗浄容器４１の側壁には供給孔５２と排気孔５３がそれぞれ形成されており、供給孔５２と排気孔５３には排気系４０の排気管４７と、溶剤噴出系５０の供給管５５がそれぞれ気密に挿入されている。
A supply hole 52 and an exhaust hole 53 are respectively formed in the side wall of the cleaning container 41, and an exhaust pipe 47 of the exhaust system 40 and a supply pipe 55 of the solvent ejection system 50 are airtight in the supply hole 52 and the exhaust hole 53, respectively. Has been inserted.

図３（ａ）の符号５７は、供給管５５の洗浄容器４１内に挿入された端部であるノズルを示しており、ノズル５７は開口４２に向けられ、溶剤噴出系の溶剤はノズル５７から開口４２上の吐出面１６に向かって噴出される。   Reference numeral 57 in FIG. 3A indicates a nozzle which is an end portion inserted into the cleaning container 41 of the supply pipe 55, the nozzle 57 is directed toward the opening 42, and the solvent in the solvent ejection system is supplied from the nozzle 57. It is ejected toward the discharge surface 16 on the opening 42.

ノズル５７は開口４２に向けられているが、その位置や角度は、吐出口１７が開口４２上に位置する時にノズル５７から噴出される溶剤が吐出口１７に噴きつけられず、その周囲に噴きつけられるようになっているので、吐出口１７の内部に多量の溶剤が入り込まない。   Although the nozzle 57 is directed to the opening 42, the position and angle of the nozzle 57 are such that the solvent ejected from the nozzle 57 when the ejection port 17 is positioned on the opening 42 is not ejected to the ejection port 17, and is ejected around the periphery. Since a large amount of solvent does not enter the inside of the discharge port 17.

吐出面１６にはインクやインクが乾燥した後の析出物が付着物として付着している。吐出口１７の周囲に噴きつけられた溶剤は、その付着物を溶解又は分散し、付着物と一緒に落下して洗浄容器４１の底壁上に溜まる。洗浄容器４１には排出系５９が接続されており、洗浄容器４１に溜まった溶剤は洗浄容器４１内部から排出系５９へ排出される。   On the ejection surface 16, ink or a precipitate after the ink is dried adheres as an adherent. The solvent sprayed around the discharge port 17 dissolves or disperses the deposit, drops together with the deposit, and accumulates on the bottom wall of the cleaning container 41. A discharge system 59 is connected to the cleaning container 41, and the solvent accumulated in the cleaning container 41 is discharged from the cleaning container 41 to the discharge system 59.

排気管４７の洗浄容器４１に挿入された端部と反対側の端部は排気ポンプ４６に接続されている。排気管４７の洗浄容器４１に挿入された端部は、ノズル５７からの溶剤が噴きつけられず、かつ洗浄容器４１の底壁に溜まった溶剤に浸漬されない位置に取り付けられているので、排気ポンプ４６を動作させると、洗浄容器４１内の気体（空気）が排気される。   The end of the exhaust pipe 47 opposite to the end inserted into the cleaning container 41 is connected to the exhaust pump 46. The end of the exhaust pipe 47 inserted into the cleaning container 41 is attached to a position where the solvent from the nozzle 57 is not sprayed and is not immersed in the solvent accumulated on the bottom wall of the cleaning container 41. When 46 is operated, the gas (air) in the cleaning container 41 is exhausted.

密着部材４３は弾性材料で構成されている。密着部材４３を構成する弾性材料は、例えばＥＰＤＭ（エチレンプロピレンジエンゴム）、ＮＢＲ（アクリロニトリニルブタジエンゴム）、ＦＫＭ（フッ素ゴム）、パーフロロエラストマー、バイトン（登録商標）、カルレッツ（登録商標）等があり、これらの弾性材料１種類で密着部材４３を構成してもよいし、２種類以上で密着部材４３を構成してもよい。   The close contact member 43 is made of an elastic material. The elastic material constituting the contact member 43 is, for example, EPDM (ethylene propylene diene rubber), NBR (acrylonitrile tributadiene rubber), FKM (fluoro rubber), perfluoroelastomer, Viton (registered trademark), Kalrez (registered trademark). The close contact member 43 may be composed of one type of these elastic materials, or the close contact member 43 may be composed of 2 or more types.

吐出面１６を密着部材４３と接触させたまま印刷ヘッド１４を押圧すると、図３（ｂ）に示すように、密着部材４３が弾性変形して洗浄容器４１の内部空間が密閉部材４３と吐出面１６で密閉される。洗浄容器４１の内部空間を密閉した状態で洗浄容器４１の内部を排気すると、洗浄容器４１内の圧力が下がる。   When the print head 14 is pressed while the discharge surface 16 is in contact with the close contact member 43, the close contact member 43 is elastically deformed as shown in FIG. 3B, so that the internal space of the cleaning container 41 becomes the seal member 43 and the discharge surface. 16 and sealed. If the inside of the cleaning container 41 is evacuated with the internal space of the cleaning container 41 sealed, the pressure in the cleaning container 41 decreases.

印刷ヘッド１４の内部にはインク１９が配置されており、吐出口１７の底面にはインクの一部が露出している。吐出口１７は開口４２上に位置するので、インク１９は吐出口１７を介して洗浄容器４１内に露出されており、洗浄容器４１内の圧力が下がると、インク１９は洗浄容器４１内に吸い込まれる。この時、吐出口１７近傍のインク１９に含まれる気泡１８は、インク１９と一緒に洗浄容器４１内に吸い込まれ、印刷ヘッド１４から排出される。   An ink 19 is disposed inside the print head 14, and a part of the ink is exposed on the bottom surface of the discharge port 17. Since the discharge port 17 is located on the opening 42, the ink 19 is exposed to the cleaning container 41 through the discharge port 17, and the ink 19 is sucked into the cleaning container 41 when the pressure in the cleaning container 41 decreases. It is. At this time, the bubbles 18 contained in the ink 19 near the ejection port 17 are sucked into the cleaning container 41 together with the ink 19 and are discharged from the print head 14.

ここでは、溶剤噴出系５０は溶剤が収容されたタンク５１を有しており、供給管５５のノズル５７とは反対側の端部は、タンク５１内に引き込まれて溶剤に浸漬されている。   Here, the solvent ejection system 50 has a tank 51 in which a solvent is accommodated, and the end of the supply pipe 55 opposite to the nozzle 57 is drawn into the tank 51 and immersed in the solvent.

洗浄容器４１内の圧力が下がると、タンク５１の溶剤も洗浄容器４１に吸い込まれ、ノズル５７から噴出される。従って、洗浄容器４１内の圧力を下げることで、洗浄容器４１にインク１９が吸い込まれると同時に、ノズル５７から溶剤が噴出される。洗浄容器４１内に吸い込まれたインク１９は洗浄容器４１の底壁上に落下し、溶剤と一緒に排出系５９に排出される。   When the pressure in the cleaning container 41 decreases, the solvent in the tank 51 is also sucked into the cleaning container 41 and ejected from the nozzle 57. Therefore, by lowering the pressure in the cleaning container 41, the ink 19 is sucked into the cleaning container 41 and at the same time, the solvent is ejected from the nozzle 57. The ink 19 sucked into the cleaning container 41 falls on the bottom wall of the cleaning container 41 and is discharged to the discharge system 59 together with the solvent.

筐体３１と台１１との間には清掃体３０が配置されている。ここでは、清掃体３０はローラ３３と、ローラ３３の側面に掛け渡された吸収シート３５とを有しており、ローラ３３は筐体３１に取り付けられた腕部３２によって、筐体３１と台１１の間の位置で略水平に保持されている。   A cleaning body 30 is disposed between the housing 31 and the base 11. Here, the cleaning body 30 includes a roller 33 and an absorbent sheet 35 that is stretched over the side surface of the roller 33, and the roller 33 is mounted on the casing 31 and the base by an arm portion 32 attached to the casing 31. 11 is held at a substantially horizontal position.

各印刷ヘッド１４の吐出口１７からインク１９を吐出しながら、各印刷ヘッド１４を移動させ、基板５表面の所定領域にインク１９を印刷ヘッド１４の移動方向に沿って連続して塗布した後、インク１９の吐出を停止して印刷工程を終了する。   While ejecting ink 19 from the ejection port 17 of each print head 14, each print head 14 is moved, and after applying the ink 19 to a predetermined region on the surface of the substrate 5 along the moving direction of the print head 14, The ejection of the ink 19 is stopped and the printing process is terminated.

ローラ３３の中心軸線は印刷ヘッド１４の移動方向と略直交するように位置しており、印刷ヘッド１４をローラ３３上に移動させ、ローラ３３上で静止させた後、ローラ３３を上昇させて吐出面１６に押し当てると、ローラ３３の側面に掛け渡された吸収シート３５が、各印刷ヘッド１４の吐出面１６と接触する。   The central axis of the roller 33 is positioned so as to be substantially orthogonal to the moving direction of the print head 14, the print head 14 is moved onto the roller 33, stopped on the roller 33, and then the roller 33 is raised to discharge. When pressed against the surface 16, the absorbent sheet 35 stretched over the side surface of the roller 33 comes into contact with the ejection surface 16 of each print head 14.

図４は吸収シート３５が吐出面１６と接触した状態を示す断面図であり、吸収シート３５はロール３６から繰り出され、ローラ３３に掛け渡された後、巻取軸３７の周囲に巻き取られている。   FIG. 4 is a cross-sectional view showing a state in which the absorbent sheet 35 is in contact with the discharge surface 16. The absorbent sheet 35 is unwound from the roll 36, passed over the roller 33, and then wound around the winding shaft 37. ing.

ローラ３３は中心軸線を中心として回転可能に構成されており、吸収シート３５を巻取軸３７に巻き取り、吸収シート３５を巻取軸３７に向かって走行させると、吸収シート３５の走行によってローラ３３が吐出面１６に押し当てられた状態で回転し、吐出面１６に付着したインク１９は拭い取られる。   The roller 33 is configured to be rotatable around a central axis. When the absorbent sheet 35 is wound around the take-up shaft 37 and the absorbent sheet 35 travels toward the take-up shaft 37, the roller 33 is moved by the travel of the absorbent sheet 35. The ink 19 is rotated while being pressed against the ejection surface 16, and the ink 19 attached to the ejection surface 16 is wiped off.

吸収シート３５は布のように液体吸収性の高いもので構成されており、拭い取られたインク１９は毛細管現象で吸収シート３５に吸収され、巻取軸１７へ送られる。   The absorbent sheet 35 is made of a material having a high liquid absorbency such as a cloth, and the wiped ink 19 is absorbed by the absorbent sheet 35 by capillary action and sent to the winding shaft 17.

吐出面１６の拭き取り終了後、印刷ヘッド１４を筐体３１上に移動させて洗浄容器４１を密閉し、洗浄容器４１にインク１９を吸い込み、ノズル５７から溶剤を噴出して印刷ヘッド１４を洗浄する。溶剤が吐出面１６に噴きつけられる時には吐出口１７から洗浄容器４１にインク１９が吸い込まれているので、溶剤が印刷ヘッド１４内に多量に入り込まない。   After wiping the discharge surface 16, the print head 14 is moved onto the housing 31 to seal the cleaning container 41, the ink 19 is sucked into the cleaning container 41, and the solvent is ejected from the nozzle 57 to clean the print head 14. . When the solvent is sprayed onto the discharge surface 16, the ink 19 is sucked into the cleaning container 41 from the discharge port 17, so that a large amount of the solvent does not enter the print head 14.

インク１９から気泡１８が除去され、吐出面１６から付着物が除去された後、溶剤の噴出を続けながら、排出系５９へ溶剤を排出するのを止め、洗浄容器４１内に溶剤を溜めた後、排気ポンプ４６のバルブ４９を閉じて排気を停止し、溶剤の噴出とインク１９の吸い込みを同時に停止させる。   After the bubbles 18 are removed from the ink 19 and the deposits are removed from the ejection surface 16, the solvent is stopped from being discharged to the discharge system 59 while continuing to eject the solvent, and the solvent is stored in the cleaning container 41. Then, the valve 49 of the exhaust pump 46 is closed to stop the exhaust, and the ejection of the solvent and the suction of the ink 19 are stopped simultaneously.

洗浄容器４１が密閉された状態を維持すると、洗浄容器４１に溜まった溶剤が蒸発して飽和状態となる。吐出口１７は溶剤の飽和蒸気に晒され、印刷ヘッド１４内のインク１９から溶剤が蒸発する量は平衡状態になるのでインク１９は乾燥せず、吐出口１７付近のインク１９の粘度は上昇しない。   If the cleaning container 41 is maintained in a sealed state, the solvent accumulated in the cleaning container 41 evaporates and becomes saturated. Since the discharge port 17 is exposed to the saturated vapor of the solvent and the amount of solvent evaporation from the ink 19 in the print head 14 is in an equilibrium state, the ink 19 is not dried and the viscosity of the ink 19 near the discharge port 17 does not increase. .

印刷を再開する時には、洗浄容器４１内を排気して減圧雰囲気を形成し、溶剤を噴出しながら吐出口１７付近のインク１９を洗浄容器４１内に吸い込んだ後、排気を停止し、洗浄容器４１内の圧力を大気圧に復圧してから印刷ヘッド１４を上昇させて吐出面１６を密閉部材４３から離す。   When resuming printing, the inside of the cleaning container 41 is evacuated to form a reduced-pressure atmosphere, and after the ink 19 near the discharge port 17 is sucked into the cleaning container 41 while ejecting the solvent, the exhaust is stopped and the cleaning container 41 is stopped. After the internal pressure is restored to atmospheric pressure, the print head 14 is raised and the discharge surface 16 is separated from the sealing member 43.

次いで印刷ヘッド１４をローラ３３上に戻して、吐出面１６に付着した溶剤やインク１９を拭い取った後、印刷ヘッド１４を台１１上に戻し、新たな印刷対象物５に向かって吐出口１７からインク１９を吐出する。   Next, the print head 14 is returned onto the roller 33 to wipe off the solvent and the ink 19 adhering to the discharge surface 16, and then the print head 14 is returned to the table 11, toward the new print object 5. Ink 19 is ejected from the ink.

吐出面１６にはインク１９や溶剤が付着しておらず、印刷ヘッド１４内のインク１９から気泡１８も除去されているので、吐出口１７からインク１９は安定して吐出される。
Since the ink 19 and the solvent are not attached to the discharge surface 16 and the air bubbles 18 are also removed from the ink 19 in the print head 14, the ink 19 is stably discharged from the discharge port 17.

以上は、インク１９を印刷ヘッド１４の移動方向に沿って連続して塗布する場合について説明したが、本発明はこれに限定されるものではなく、印刷対象物５の所定位置だけにインク１９を塗布する場合も本発明には含まれる。   In the above, the case where the ink 19 is continuously applied along the moving direction of the print head 14 has been described. However, the present invention is not limited to this, and the ink 19 is applied only to a predetermined position of the print object 5. The case of application is also included in the present invention.

図５の符号６０は所定位置にインクを塗布可能な印刷部の一例を示しており、台１１上にはＹ軸方向とＸ軸方向にそれぞれ伸びるガイドレール６１1、６１2、６２1〜６２4が配置されている。 Reference numeral 60 in FIG. 5 shows an example of a printing unit that can apply ink to a predetermined position. Guide rails 61 1 , 61 2 , 62 1 to 62 extending on the base 11 in the Y-axis direction and the X-axis direction, respectively. 4 is arranged.

Ｘ軸方向に伸びるガイドレール６２1〜６２4には２本の保持体６３ａ、６３ｂがＸ軸方向に移動可能に取り付けられており、保持体６３ａ、６３ｂを移動させると、保持体６３ａ、６３ｂに取り付けられた印刷ヘッド１４もＸ軸方向に一緒に移動する。印刷ヘッド１４は台１１上の印刷対象物５表面よりも高い位置で保持されているので、印刷ヘッド１４は印刷対象物５に接触せずにその表面上を移動する。 X axis direction extending guide rail 62 1-62 in 4 two holding elements 63a, 63b is mounted to be movable in the X-axis direction, the holding member 63a, is moved to 63 b, the holding member 63a, 63b The print head 14 attached to the head also moves together in the X-axis direction. Since the print head 14 is held at a position higher than the surface of the print object 5 on the table 11, the print head 14 moves on the surface without contacting the print object 5.

Ｘ軸方向のガイドレール６２1〜６２4を移動させると、保持体６３ａ、６３ｂがＸ軸及びＹ軸と成す角度が変わる。保持体６３ａ、６３ｂがＸ軸及びＹ軸と成す角度を変えると、吐出口１７と吐出口１７との間のＸ軸方向の距離とＹ軸方向の距離が変わる。 Moving the X-axis direction of the guide rail 62 1-62 4, the holding member 63a, 63b is change angle between X axis and the Y-axis. When the angles formed by the holding bodies 63a and 63b with the X axis and the Y axis are changed, the distance in the X axis direction and the distance in the Y axis direction between the discharge port 17 and the discharge port 17 are changed.

印刷対象物５のインクを塗布すべき印刷位置の間隔が、吐出口１７の間隔と一致しない場合は、吐出口１７と吐出口１７との間のＸ軸方向の距離とＹ軸方向の距離が変えて、吐出口１７の間隔を適合させてから、印刷対象物５上に印刷ヘッド１４を移動させれば、所定の印刷位置にインクを着弾させることができる。   When the interval between the print positions where the ink of the printing object 5 is to be applied does not match the interval between the discharge ports 17, the distance between the discharge ports 17 and 17 in the X-axis direction and the distance between the Y-axis directions are In other words, if the print head 14 is moved onto the printing object 5 after the interval between the ejection ports 17 is adapted, the ink can be landed at a predetermined printing position.

印刷終了後、吐出面１６を拭うときには、保持体６３ａ、６３ｂのＸ軸方向の距離とＹ軸方向の距離を変え、印刷ヘッド１４が並べられた列をローラ３３の中心軸線と平行にしてから、ローラ３３を印刷ヘッド１４に押し当てれば、各印刷ヘッド１４の吐出面１６が吸収シート３５が接触する。   When wiping the discharge surface 16 after printing, the distance between the holders 63a and 63b in the X-axis direction and the Y-axis direction is changed, and the row in which the print heads 14 are arranged is parallel to the central axis of the roller 33. When the roller 33 is pressed against the print head 14, the discharge surface 16 of each print head 14 comes into contact with the absorbent sheet 35.

また、吐出面１６を洗浄するときには、保持体６３ａ、６３ｂのＸ軸方向の距離とＹ軸方向の距離を変え、印刷ヘッド１４の間隔を、洗浄容器４１の間隔と一致させてから、印刷ヘッド１４を密閉部材４３に押し当てれば、各洗浄容器４１が、対応する印刷ヘッド１４の吐出面１６でそれぞれ密閉される。   Further, when cleaning the discharge surface 16, the distance between the X-axis direction and the Y-axis direction of the holding bodies 63a and 63b is changed so that the interval between the print heads 14 and the interval between the cleaning containers 41 coincide with each other. When 14 is pressed against the sealing member 43, each cleaning container 41 is sealed with the discharge surface 16 of the corresponding print head 14.

以上は１つの印刷ヘッド１４で１つの洗浄容器４１を密閉する場合について説明したが本発明はこれに限定されるものではない。吐出口１７が開口４２上に位置する状態で、洗浄容器４１が密閉されるのであれば、例えば複数の開口４２が設けられた洗浄容器４１を複数の印刷ヘッド１４で密閉してもよいし、１つの開口４２上に２つ以上の印刷ヘッド１４を配置して洗浄容器４１を密閉してもよい。   The case where one cleaning container 41 is sealed with one print head 14 has been described above, but the present invention is not limited to this. If the cleaning container 41 is sealed with the discharge port 17 positioned on the opening 42, for example, the cleaning container 41 provided with a plurality of openings 42 may be sealed with a plurality of print heads 14, Two or more print heads 14 may be disposed on one opening 42 to seal the cleaning container 41.

密閉部材４３が接触するのは吐出面１６でなくても良く、洗浄容器４１が密閉されるのであれば、密閉部材４３が保持体１３や他の部材に接触してもよい。また、密閉部材４３を印刷ヘッド１４又は保持体１３に設け、密閉部材４３を洗浄容器４１又は筐体３１に接触させてもよい。   The sealing member 43 may not be in contact with the discharge surface 16. If the cleaning container 41 is sealed, the sealing member 43 may contact the holding body 13 and other members. Further, the sealing member 43 may be provided on the print head 14 or the holding body 13, and the sealing member 43 may be brought into contact with the cleaning container 41 or the casing 31.

更に、密閉部材４３を印刷ヘッド１４（印刷ヘッド１４又は保持体１３）と、洗浄容器４１側（洗浄容器４１又は筐体３１）の両方に設けてもよい。密閉部材４３を構成する弾性材料も特に限定されず、合成ゴム、天然ゴム等種々のものを用いることができる。   Furthermore, the sealing member 43 may be provided on both the print head 14 (the print head 14 or the holding body 13) and the cleaning container 41 side (the cleaning container 41 or the casing 31). The elastic material constituting the sealing member 43 is not particularly limited, and various materials such as synthetic rubber and natural rubber can be used.

印刷ヘッド１４を洗浄するタイミングは特に限定されず、１つの印刷対象物５への印刷を終了する度に洗浄を行ってもよいし、複数枚の印刷対象物５への印刷を終了した後に洗浄を行ってもよいし、更に１つの印刷対象物５への印刷を行っている途中に、インクの吐出を停止して洗浄を行い、洗浄後は再び同じ印刷対象物５上へ印刷ヘッド１４を戻し、印刷を再開してもよい。   The timing for cleaning the print head 14 is not particularly limited, and cleaning may be performed every time printing on one print object 5 is completed, or after completion of printing on a plurality of print objects 5. In addition, while printing on one print object 5 is being performed, ink ejection is stopped and cleaning is performed, and after the cleaning, the print head 14 is moved onto the same print object 5 again. You may return and resume printing.

吸収シート３５で吐出面１６を拭うタイミングや回数も特に限定されるものではなく、洗浄容器４１で印刷ヘッドを洗浄する前だけ吐出面１６を拭ってもよいし、洗浄容器４１で印刷ヘッドを洗浄した後だけ吐出面１６を拭ってもよい。尚、巻き出しロール３６からローラ３３へ送られる吸収シート３５に、テンションローラ３４を押し当てると吸収シート３５の張力を制御することができる。   The timing and frequency of wiping the discharge surface 16 with the absorbent sheet 35 are not particularly limited, and the discharge surface 16 may be wiped only before the print head is cleaned with the cleaning container 41, or the print head is cleaned with the cleaning container 41. Only after the discharge surface 16 may be wiped. Note that the tension of the absorbing sheet 35 can be controlled by pressing the tension roller 34 against the absorbing sheet 35 sent from the unwinding roll 36 to the roller 33.

清掃体３０は吐出面１６や吐出口１７を傷つけないものであれば特に限定されるものではなく、例えばブラシやスポンジを用いることもできる。吐出面１６からインクを拭い取るという点では、清掃体３０は吐出面１６に接触した状態で、移動するものが好ましく、装置の小スペース化という点では中心軸線を中心として回転するローラ状のものが好ましい。   The cleaning body 30 is not particularly limited as long as it does not damage the discharge surface 16 and the discharge port 17. For example, a brush or a sponge can be used. In terms of wiping ink from the discharge surface 16, the cleaning body 30 is preferably moved while in contact with the discharge surface 16, and in terms of reducing the space of the apparatus, it is a roller that rotates about the central axis. Is preferred.

また、清掃体３０が吐出面１４に接触した状態で、印刷ヘッド１４に対して相対的に移動するのであれば、清掃体３０を静止させ、印刷ヘッド１４を移動させてもよいし、清掃体３０と印刷ヘッド１４の両方を移動させてもよい。   If the cleaning body 30 is in contact with the ejection surface 14 and moves relative to the print head 14, the cleaning body 30 may be stationary and the print head 14 may be moved. Both 30 and the print head 14 may be moved.

吐出口１７が吐出するインクは特に限定されず、例えば配向膜に用いられる樹脂材料が溶剤に溶解されたインクや、有機ＥＬ素子の有機層の構成材料（有機材料）が溶剤に溶解されたインクや、染料が溶剤に溶解されたインクや、金属粒子が溶剤に分散されたインクや、顔料が溶剤に分散されたインクや、スペーサ粒子が溶剤に溶解されたインクである。   The ink discharged from the discharge port 17 is not particularly limited. For example, the ink in which the resin material used for the alignment film is dissolved in the solvent, or the ink in which the constituent material (organic material) of the organic layer of the organic EL element is dissolved in the solvent. And ink in which a dye is dissolved in a solvent, ink in which metal particles are dispersed in a solvent, ink in which a pigment is dispersed in a solvent, and ink in which spacer particles are dissolved in a solvent.

ノズル５７から噴出させる溶剤は、印刷ヘッド１４内のインクを変性させず、かつ、インクやその析出物を溶解又は分散可能なものであれば特に限定されるものでもないが、インクに含まれる溶剤と同じ種類のものを用いれば、吐出口１７から印刷ヘッド１４の内部に多少溶剤が浸入してもインクの組成が大きく変わらないので特に好ましい。   The solvent ejected from the nozzle 57 is not particularly limited as long as it does not denature the ink in the print head 14 and can dissolve or disperse the ink and the precipitates thereof, but the solvent contained in the ink If the same type is used, the composition of the ink does not change greatly even if a little solvent enters the inside of the print head 14 from the discharge port 17, which is particularly preferable.

以上は、洗浄容器４１内を排気し、供給管５５に溶剤を吸い込んでノズル５７から噴出させる場合について説明したが本発明はこれに限定されず、例えばタンク５１にポンプを接続し、該ポンプによって圧縮空気や溶剤をタンク５１に供給して供給管５５に溶剤を押し出して、ノズル５７から溶剤を噴出させてもよい。   The above describes the case where the inside of the cleaning container 41 is exhausted, the solvent is sucked into the supply pipe 55 and ejected from the nozzle 57, but the present invention is not limited to this. For example, a pump is connected to the tank 51, and the pump The solvent may be ejected from the nozzle 57 by supplying compressed air or a solvent to the tank 51 and pushing out the solvent into the supply pipe 55.

この場合は吐出口１７からのインクの吸い込みと、ノズル５７からの溶剤の噴出を別々に行うことができるが、溶剤の噴出をせずにインク１９の吸い込むと、インク１９の吸い込みを停止後、洗浄容器４１内を復圧する時に印刷ヘッド１４内に気泡が入り込んでしまう。   In this case, the suction of the ink from the ejection port 17 and the ejection of the solvent from the nozzle 57 can be performed separately, but if the ink 19 is sucked without ejecting the solvent, the suction of the ink 19 is stopped. Air bubbles enter the print head 14 when the pressure in the cleaning container 41 is restored.

溶剤を噴出し、吐出面１６が濡れた状態でインク１９の吸い込みを停止すれば、印刷ヘッド１４内に溶剤は入り込んでも気泡は入り込まないので、洗浄容器４１内を減圧してインク１９を吸い込むのと、溶剤の噴出は一緒に行うことが好ましい。   If the suction of the ink 19 is stopped when the solvent is ejected and the ejection surface 16 is wet, the bubbles do not enter even if the solvent enters the print head 14, so the pressure inside the cleaning container 41 is reduced and the ink 19 is sucked. And it is preferable to carry out the ejection of the solvent together.

印刷装置の平面図Plan view of printing device （ａ）：印刷ヘッドを説明するための平面図、（ｂ）：印刷ヘッドと開口との位置関係を模式的に示す平面図(A): Plan view for explaining the print head, (b): Plan view schematically showing the positional relationship between the print head and the opening. （ａ）：洗浄容器の模式的な断面図、（ｂ）洗浄工程を説明する断面図(A): A schematic cross-sectional view of a cleaning container, (b) a cross-sectional view illustrating a cleaning process 清掃体を説明するための模式的な断面図Schematic sectional view for explaining the cleaning body 印刷部の一例を説明する平面図A plan view illustrating an example of a printing unit

符号の説明Explanation of symbols

１……印刷装置 １０……印刷部 １４……印刷ヘッド １６……吐出面 １７……吐出口 １９……インク ２０……洗浄部（洗浄装置） ３０……清掃体 ４０……排気系 ４１……洗浄容器 ４２……開口 ５０……溶剤噴出系   DESCRIPTION OF SYMBOLS 1 ... Printing apparatus 10 ... Printing part 14 ... Print head 16 ... Discharge surface 17 ... Discharge port 19 ... Ink 20 ... Cleaning part (cleaning apparatus) 30 ... Cleaning body 40 ... Exhaust system 41 ... ... Cleaning container 42 ... Opening 50 ... Solvent ejection system

Claims (4)

インクを吐出可能な吐出口を有する印刷ヘッドの、前記吐出口が設けられた吐出面を洗浄する洗浄装置であって、
開口の大きさが前記吐出面よりも小さく、前記開口の周囲が前記吐出面と接触可能な洗浄容器を有し、
前記洗浄容器は前記吐出面を前記開口の周囲に接触させた時に密閉されるように構成され、
前記洗浄容器には、密閉された前記洗浄容器の内部を排気して前記洗浄容器内の圧力を低下させる排気ポンプと、
前記洗浄容器内の圧力が低下すると、前記洗浄容器内に位置するノズルから、溶剤を前記吐出面に向かって噴出する溶剤噴出系と、
前記洗浄容器に溜まった前記溶剤とを排出する排出系と、が設けられ、
前記排気ポンプは、前記洗浄容器の底壁に溜まった前記溶剤に浸漬されない位置に配置された排気管の端部から、前記洗浄容器の内部の気体を排気するように構成された洗浄装置。 A cleaning device for cleaning a discharge surface provided with the discharge port of a print head having a discharge port capable of discharging ink,
A size of the opening is smaller than the discharge surface, and the periphery of the opening has a cleaning container that can contact the discharge surface ,
The cleaning container is configured to be sealed when the discharge surface is brought into contact with the periphery of the opening;
In the cleaning container, an exhaust pump that exhausts the inside of the sealed cleaning container to reduce the pressure in the cleaning container;
When the pressure in the cleaning container decreases, a solvent ejection system that ejects the solvent from the nozzle located in the cleaning container toward the discharge surface;
A discharge system for discharging the solvent accumulated in the cleaning container, and
The exhaust pump is a cleaning apparatus configured to exhaust the gas inside the cleaning container from an end of an exhaust pipe disposed at a position where the exhaust gas is not immersed in the solvent accumulated on the bottom wall of the cleaning container . 前記溶剤噴出系は、溶剤が収容されたタンクと、一端が前記タンク内で前記溶剤に浸漬され、他端が前記洗浄容器内に挿入された供給管とを有し、
前記洗浄容器内を排気し、前記洗浄容器内の圧力が下がると、前記タンク内の前記溶剤が前記供給管を通って前記洗浄容器内に引き込まれる請求項１記載の洗浄装置。 The solvent ejection system has a tank containing a solvent, and a supply pipe having one end immersed in the solvent in the tank and the other end inserted into the cleaning container,
The cleaning apparatus according to claim 1, wherein when the inside of the cleaning container is evacuated and the pressure in the cleaning container decreases, the solvent in the tank is drawn into the cleaning container through the supply pipe. 前記洗浄容器の外部に設けられた清掃体を有し、
前記清掃体は、前記吐出面に接触して前記吐出面に付着した液体を除去するように構成された請求項１又は請求項２のいずれか１項記載の洗浄装置。 A cleaning body provided outside the cleaning container;
The cleaning device according to claim 1, wherein the cleaning body is configured to remove liquid adhering to the discharge surface by contacting the discharge surface. 前記溶剤噴出系は、前記溶剤を前記吐出面に向かって噴出するときに、前記印刷ヘッドの前記吐出口の周囲に、前記溶剤を吹き付ける請求項１乃至請求項３のいずれか１項記載の洗浄装置。The cleaning according to any one of claims 1 to 3, wherein the solvent ejection system sprays the solvent around the ejection port of the print head when the solvent is ejected toward the ejection surface. apparatus.
JP2005222439A 2005-08-01 2005-08-01 Cleaning device Expired - Fee Related JP4667153B2 (en)

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JP2004136654A (en) * 2002-09-24 2004-05-13 Konica Minolta Holdings Inc Liquid ejector
JP2005066964A (en) * 2003-08-22 2005-03-17 Ricoh Co Ltd Head cleaning device and image forming apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004136654A (en) * 2002-09-24 2004-05-13 Konica Minolta Holdings Inc Liquid ejector
JP2005066964A (en) * 2003-08-22 2005-03-17 Ricoh Co Ltd Head cleaning device and image forming apparatus

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