JP2005319655A - Ink feeding device in inkjet recorder - Google Patents

Ink feeding device in inkjet recorder Download PDF

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Publication number
JP2005319655A
JP2005319655A JP2004138730A JP2004138730A JP2005319655A JP 2005319655 A JP2005319655 A JP 2005319655A JP 2004138730 A JP2004138730 A JP 2004138730A JP 2004138730 A JP2004138730 A JP 2004138730A JP 2005319655 A JP2005319655 A JP 2005319655A
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ink
back pressure
recording head
tank
pressure tank
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Japanese (ja)
Inventor
Hiroyuki Matsuba
浩幸 松葉
Kazunari Chikanawa
一成 近縄
Shigeyuki Takao
重幸 高尾
Hideo Izawa
秀男 井沢
Takao Namiki
孝夫 並木
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Miyakoshi Printing Machinery Co Ltd
Panasonic Holdings Corp
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Miyakoshi Printing Machinery Co Ltd
Matsushita Electric Industrial Co Ltd
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Application filed by Miyakoshi Printing Machinery Co Ltd, Matsushita Electric Industrial Co Ltd filed Critical Miyakoshi Printing Machinery Co Ltd
Priority to JP2004138730A priority Critical patent/JP2005319655A/en
Priority to DE602005014907T priority patent/DE602005014907D1/en
Priority to DE602005024876T priority patent/DE602005024876D1/en
Priority to EP08016500A priority patent/EP2025519B1/en
Priority to EP05103284A priority patent/EP1593519B1/en
Priority to US11/115,795 priority patent/US7628476B2/en
Priority to CN 200510068502 priority patent/CN1693087B/en
Publication of JP2005319655A publication Critical patent/JP2005319655A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a mechanism for adjusting a position head of ink supply to a recording head by a light equipment at low cost. <P>SOLUTION: A back pressure tank 2 is set between a recording head 1 and a main tank 4 in an inkjet recorder. The back pressure tank 2 connects with the recording head 2 and also keeps a constant liquid level by refilling ink from the main tank 4 according to a consumption amount of the ink. The position head of the liquid level of the back pressure tank 2 to the recording head 1 can be adjusted by positionally adjusting the back pressure tank 2 in a height direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、長時間にわたって連続印字可能なインクジェット記録装置の記録ヘッドへインクを供給するインク供給装置に関するものである。   The present invention relates to an ink supply apparatus that supplies ink to a recording head of an inkjet recording apparatus capable of continuous printing over a long period of time.

インクジェット記録装置の記録ヘッドへのインクの供給圧力は、記録ヘッドの稼動状態、例えばパージ時、初期充填時、印字時、記録ヘッド面のワイピング時、ワイピングブレードの洗浄時等のそれぞれにおいて最適にすることが望ましい。   The ink supply pressure to the recording head of the ink jet recording apparatus is optimized in each operation state of the recording head, for example, purging, initial filling, printing, wiping of the recording head surface, wiping blade cleaning, etc. It is desirable.

このため、従来のこの種のインク供給装置にあっては、記録ヘッドへのインク供給元であるインクタンクを、印字時や記録ヘッドのワイピング時などの状況に応じて、物理的に上昇あるいは下降させて、インクタンクの位置水頭を変化させて記録ヘッドに作用するインク圧力を変えるようにしている（例えば、特許文献１及び２参照）。   For this reason, in this type of conventional ink supply device, the ink tank that is the ink supply source to the recording head is physically raised or lowered depending on the situation such as printing or wiping the recording head. Thus, the ink pressure acting on the recording head is changed by changing the position head of the ink tank (see, for example, Patent Documents 1 and 2).

特開平１１−２０１８０号公報Japanese Patent Laid-Open No. 11-20180 特開平７−１３７２８６号公報JP-A-7-137286

上記した従来のインク供給装置は、いずれも記録ヘッドへインクを供給するために記録ヘッドの直前に設けられるメインタンクを昇降することにより、記録ヘッドに対するインクの液面の高さを調整するようになっている。   In each of the conventional ink supply devices described above, the height of the ink surface relative to the recording head is adjusted by raising and lowering the main tank provided immediately before the recording head in order to supply ink to the recording head. It has become.

産業用のインクジェット記録装置においては、連続稼動が条件となるため、インクタンクが大容量となり、それだけインクタンクが大型となりその容量も大きくなる。そのため、上記した従来の技術のように、このメインタンクを昇降するための駆動源及び駆動構造が大掛かりなものとなり、設置スペースや製造コストなどの面で問題があった。   In an industrial inkjet recording apparatus, since continuous operation is a requirement, the ink tank has a large capacity, and the ink tank becomes large and the capacity increases accordingly. For this reason, as in the conventional technique described above, the drive source and drive structure for raising and lowering the main tank become large, and there are problems in terms of installation space and manufacturing cost.

また、インクタンクの大型化により、このインクタンクの昇降による液面制御の反応が悪かった。更に、液面の位置水頭による測定圧からのソフト的な制御においては、制御装置が複雑になってコスト的に問題があった。   In addition, due to the increase in size of the ink tank, the reaction of the liquid level control by raising and lowering the ink tank is bad. Furthermore, in the software control from the measurement pressure by the position head of the liquid level, there is a problem in cost because the control device becomes complicated.

本発明に上記のような技術的課題を解決するためになされたもので、その構成は、インクジェット記録装置における記録ヘッドとメインタンクの間に、記録ヘッドに接続すると共に、インクの消費量に応じてメインタンクからインクを補給して一定の液面を保つようにした背圧タンクを設け、この背圧タンクを高さ方向に位置調節して、記録ヘッドに対する背圧タンクの液面の位置水頭を調節可能にした構成になっている。   The present invention has been made to solve the technical problems as described above, and the configuration is connected to the recording head between the recording head and the main tank in the ink jet recording apparatus, and also according to the ink consumption. A back pressure tank is provided to maintain a constant liquid level by supplying ink from the main tank, and the position of the back pressure tank relative to the recording head is adjusted by adjusting the position of the back pressure tank in the height direction. It is configured to be adjustable.

そして上記構成のインクジェット記録装置におけるインク供給装置において、背圧タンクをタンク昇降装置にて昇降可能に支持し、タンク昇降装置にて、記録ヘッドに対する背圧タンク内の液面の位置水頭を、印字時には記録ヘッドの印字面より低くし、ワイピング時、パージ時、初期充填時のそれぞれでは順次記録ヘッドの印字面より高くした。そしてこの装置において、記録ヘッドの印字時の高さＨ１を略−３０ｍｍ、ワイピング時の高さＨ２を略２０ｍｍ、パージ時の高さＨ３を７０±３０ｍｍ、初期充填時の高さＨ４を略３００ｍｍとした。 In the ink supply device in the ink jet recording apparatus having the above-described configuration, the back pressure tank is supported by the tank lifting device so that the back pressure tank can be moved up and down. Sometimes it was lower than the printing surface of the recording head, and higher than the printing surface of the recording head in each order during wiping, purging, and initial filling. Then, in this apparatus, substantially -30mm the height H 1 during printing of the recording head, substantially 20mm high H 2 of the wiping, the height H 3 of 70 ± 30 mm during the purge, the height H at the time of initial filling 4 was approximately 300 mm.

本発明によれば、記録ヘッドに対するインク液面の位置水頭を調節するために昇降される背圧タンクが、メインタンクに比較して小型、軽量にすることができることにより、この背圧タンクを昇降して位置水頭を調節する位置水頭調整機構を軽装備で低コストに製造できる。   According to the present invention, the back pressure tank that is raised and lowered to adjust the position of the ink liquid surface relative to the recording head can be made smaller and lighter than the main tank, so that the back pressure tank can be raised and lowered. The position head adjustment mechanism that adjusts the position head can be manufactured at low cost with light equipment.

また、位置水頭を得るための背圧タンクは上記したように小型で、容量が小さいので、背圧タンクの昇降による液面制御の応答性がよくなると共に保守性がよくなり、また位置水頭による測定圧からのソフト的な制御における制御装置が簡易的なものでよく、この制御装置を低いコストで提供できる。   In addition, the back pressure tank to obtain the position head is small and has a small capacity as described above, so that the response of the liquid level control by raising and lowering the back pressure tank is improved and maintainability is improved. The control device for the soft control from the pressure may be simple, and this control device can be provided at low cost.

また、メインタンクを装置原動側などの空間に設置し、記録ヘッド近くにメインタンクより小型の背圧タンクを設けることになり、記録ヘッド側の構成をコンパクトにすることができる。そして、この背圧タンクにはインク消費量に応じてメインタンクからインクが補充されるので、長時間の連続稼動も可能である。   Further, the main tank is installed in a space such as the apparatus driving side and a back pressure tank smaller than the main tank is provided near the recording head, so that the configuration on the recording head side can be made compact. Since the back pressure tank is replenished with ink from the main tank according to the ink consumption, it can be operated continuously for a long time.

そして、さらに上記背圧タンクによる位置水頭が、任意に調整できることにより、記録ヘッドにおけるインク充填時、パージ時、印字時、ワイピング時等における供給インク圧を精度よく制御できる。   Further, since the position head of the back pressure tank can be adjusted arbitrarily, the supply ink pressure at the time of ink filling, purging, printing, wiping, etc. in the recording head can be accurately controlled.

図１は本発明に係るインクジェット記録装置におけるインク供給装置のインク供給系の構成を模式的に示す説明図である。   FIG. 1 is an explanatory view schematically showing the configuration of an ink supply system of an ink supply apparatus in an ink jet recording apparatus according to the present invention.

図中１はインクジェット記録装置の記録ヘッド、２はこの記録ヘッド１にインク供給管３を介して接続した背圧タンク、４はこの背圧タンク２にインク供給管５を介して接続したメインタンクである。メインタンク４と背圧タンク２とを接続するインク供給管５には、背圧タンク２内のインク６の消費量に応じてメインタンク４からインクを補給するインク供給ポンプ７が介装してある。上記両インク供給管３，５は背圧タンク２の底部、少なくともインク液面より低い位置に接続されている。また、背圧タンク２はフィルタ８を介して大気圧に連通してある。   In the figure, 1 is a recording head of an ink jet recording apparatus, 2 is a back pressure tank connected to the recording head 1 via an ink supply pipe 3, and 4 is a main tank connected to the back pressure tank 2 via an ink supply pipe 5. It is. The ink supply pipe 5 that connects the main tank 4 and the back pressure tank 2 is provided with an ink supply pump 7 that replenishes ink from the main tank 4 according to the amount of ink 6 consumed in the back pressure tank 2. is there. Both the ink supply pipes 3 and 5 are connected to the bottom of the back pressure tank 2, at least at a position lower than the ink liquid level. Further, the back pressure tank 2 communicates with the atmospheric pressure via the filter 8.

上記記録ヘッド１は、例えば、ピエゾ素子等の電気機械変換体を用いたものが用いられており、図示しない制御装置にてその作動が制御されるようになっている。   The recording head 1 uses, for example, an electromechanical transducer such as a piezo element, and its operation is controlled by a control device (not shown).

背圧タンク２内には、この中に収納されるインク６の液面に浮かぶ板状のフロート９が内装してある。またこの背圧タンク２にはタンク内のフロート９の位置を介してインク６の液面高さを検出する液面検出計１０が設けてある。そして上記したインク供給ポンプ７の作動が、この液面検出器１０の検出値により図示しない制御装置にて制御されるようになっている。   In the back pressure tank 2, a plate-like float 9 floating on the liquid surface of the ink 6 accommodated therein is housed. Further, the back pressure tank 2 is provided with a liquid level detector 10 for detecting the liquid level of the ink 6 through the position of the float 9 in the tank. The operation of the ink supply pump 7 is controlled by a control device (not shown) based on the detection value of the liquid level detector 10.

すなわち、背圧タンク２内のインク６がインク供給管３を介して記録ヘッド１へ供給されてこの液面が低下したときに、このときの液面低下を検出した液面検出器１０からの信号によりインク供給ポンプ７が作動してメインタンク４から背圧タンク２へインクが供給される。そしてこのインク供給量が所定量となり、上記背圧タンク２内のインク液面が所定の位置になったときに、これを検出する液面検出器１０からの信号によりインク供給ポンプ７が停止されるようになっていて、背圧タンク２内のインク６の液面は常時所定の高さに維持されるようになっている。   That is, when the ink 6 in the back pressure tank 2 is supplied to the recording head 1 through the ink supply pipe 3 and the liquid level is lowered, the liquid level detector 10 that detects the liquid level drop at this time In response to the signal, the ink supply pump 7 operates to supply ink from the main tank 4 to the back pressure tank 2. When the ink supply amount becomes a predetermined amount and the ink level in the back pressure tank 2 reaches a predetermined position, the ink supply pump 7 is stopped by a signal from the liquid level detector 10 for detecting this. The liquid level of the ink 6 in the back pressure tank 2 is always maintained at a predetermined height.

上記背圧タンク２はブラケット１１を介してタンク昇降装置１２にて支持されている。このタンク昇降装置１２は、上記ブラケット１１に上下方向に螺装されるねじ軸１３と、このねじ軸１３を正逆方向に回転するモータ１４とからなっていて、モータ１４を正転あるいは逆転することにより背圧タンク２が昇降するようになっていて、この背圧タンク２が昇降されることにより、記録ヘッド１の印字面に対する背圧タンク２の液面の位置水頭が変化されるようになっている。   The back pressure tank 2 is supported by a tank lifting device 12 via a bracket 11. The tank lifting device 12 includes a screw shaft 13 that is screwed to the bracket 11 in the vertical direction and a motor 14 that rotates the screw shaft 13 in forward and reverse directions. The motor 14 is rotated forward or backward. As a result, the back pressure tank 2 is moved up and down, and as the back pressure tank 2 is moved up and down, the position head of the liquid level of the back pressure tank 2 with respect to the print surface of the recording head 1 is changed. It has become.

背圧タンク２のインク６の液面より低い位置に、背圧タンク２内のインク６中の空気を抜くための脱気装置１５が接続してある。この脱気装置１５は循環型のものが用いられ、タンク内のインクを脱気装置１５を通すことにより脱気するようになっている。   A deaeration device 15 for removing air in the ink 6 in the back pressure tank 2 is connected to a position lower than the liquid level of the ink 6 in the back pressure tank 2. This deaeration device 15 is a circulation type, and deaerates the ink in the tank by passing it through the deaeration device 15.

上記構成において、記録ヘッド１を図示しない制御装置の制御にて作動することにより、これの下面に対して０．５〜１．５ｍｍ離隔した位置を走行する用紙（被記録材）に印字されていく。   In the above configuration, by operating the recording head 1 under the control of a control device (not shown), printing is performed on a sheet (recording material) that travels at a position 0.5 to 1.5 mm apart from the lower surface thereof. Go.

このときにおいて、背圧タンク２内のインク量は液面検出器１０の検出値にて制御されるインク供給ポンプ７にて一定に保たれる。一方、記録ヘッド１の印字面に対する上記インクの液面高さ、すなわち位置水頭はタンク昇降装置１２にて背圧タンク２を昇降することにより変えられる。   At this time, the ink amount in the back pressure tank 2 is kept constant by the ink supply pump 7 controlled by the detection value of the liquid level detector 10. On the other hand, the liquid level height of the ink with respect to the print surface of the recording head 1, that is, the position head is changed by moving the back pressure tank 2 up and down by the tank lifting device 12.

そしてこのときの位置水頭は、印字時、ワイピング時、パージ時、初期充填時のそれぞれに適した位置水頭Ｈ１，Ｈ２，Ｈ３，Ｈ４に選択的に設定する。 The position head at this time is selectively set to position heads H 1 , H 2 , H 3 , and H 4 suitable for printing, wiping, purging, and initial filling, respectively.

すなわち、背圧タンク２から記録ヘッド１間のインク供給管３内の空気を吸引してインクで充填させる初期充填時の位置水頭Ｈ４は最も高くなり、また、印字後の小休止期間を経て再印字を実施する際のインク供給管３中に混入したゴミや固形インク等、及び混入空気を排除して新しいインクに置換するためのパージ作業時の位置水頭Ｈ３も初期充填時の位置水頭Ｈ４に近い圧力が必要である。 That is, the back pressure tank 2 position of head H 4 during the initial filling of the air in the ink supply pipe 3 with suction is filled with ink between the recording head 1 from the highest, also through the pause period after printing The position head H 3 at the time of purging for removing dust, solid ink, etc. mixed in the ink supply pipe 3 at the time of reprinting, and replacing the mixed air with new ink is also the position head at the time of initial filling. it is necessary to pressure close to H 4.

また、印字作業中は記録ヘッド１に対するインク圧はマイナスが適当となり、このときの位置水頭Ｈ１は記録ヘッド１の印字面より低くする。一方ワイピング作業中の位置水頭Ｈ２はややプラス側にする。これらにおいて、上記各位置水頭の一例として印字時の高さＨ１を略−３０ｍｍ、ワイピング時の高さＨ２を略２０ｍｍ、パージ時の高さＨ３を７０±３０ｍｍ、初期充填時の高さＨ４を略３００ｍｍとした。 Also, printing work ink pressure on the recording head 1 is negative becomes appropriate, elevation head H 1 at this time is lower than the print surface of the recording head 1. Meanwhile elevation head H 2 in the wiping operation slightly on the plus side. In these, the substantially -30mm the height H 1 during printing as an example of the elevation head, substantially 20mm high H 2 of the wiping, the height H 3 of 70 ± 30 mm during purging, the time of the initial fill height It is the H 4 to substantially 300 mm.

上記構成において、背圧タンク２の容量は、記録ヘッド１における印字速度に見合う容量でよく、従ってメインタンク４の容量に比較して少なく、従ってこの背圧タンク２はメインタンク４に対して小型、軽量になっている。   In the above configuration, the capacity of the back pressure tank 2 may be a capacity corresponding to the printing speed in the recording head 1, and is therefore smaller than the capacity of the main tank 4, so the back pressure tank 2 is smaller than the main tank 4. It is lightweight.

本発明に係る装置のインク供給系の一例を模式的に示す説明図である。It is explanatory drawing which shows typically an example of the ink supply system of the apparatus which concerns on this invention.

符号の説明Explanation of symbols

１…記録ヘッド、２…背圧タンク、３，５…インク供給管、４…メインタンク、６…インク、７…インク供給ポンプ、８…フィルタ、９…フロート、１０…液面検出器、１１…ブラケット、１２…タンク昇降装置、１３…ねじ軸、１４…モータ、１５…脱気装置。   DESCRIPTION OF SYMBOLS 1 ... Recording head, 2 ... Back pressure tank, 3, 5 ... Ink supply pipe, 4 ... Main tank, 6 ... Ink, 7 ... Ink supply pump, 8 ... Filter, 9 ... Float, 10 ... Liquid level detector, 11 DESCRIPTION OF SYMBOLS ... Bracket, 12 ... Tank raising / lowering device, 13 ... Screw shaft, 14 ... Motor, 15 ... Deaeration device.

Claims (3)

インクジェット記録装置における記録ヘッドとメインタンクの間に、記録ヘッドに接続すると共に、インクの消費量に応じてメインタンクからインクを補給して一定の液面を保つようにした背圧タンクを設け、
この背圧タンクを高さ方向に位置調節して、記録ヘッドに対する背圧タンクの液面の位置水頭を調節可能にしたことを特徴とするインクジェット記録装置におけるインク供給装置。 A back pressure tank is provided between the recording head and the main tank in the ink jet recording apparatus, connected to the recording head, and replenished with ink from the main tank according to the amount of ink consumed to maintain a constant liquid level.
An ink supply apparatus for an ink jet recording apparatus, wherein the position of the back pressure tank is adjusted in the height direction so that the position of the liquid surface of the back pressure tank relative to the recording head can be adjusted. 背圧タンクをタンク昇降装置にて昇降可能に支持し、タンク昇降装置にて、記録ヘッドに対する背圧タンク内の液面の位置水頭を、印字時には記録ヘッドの印字面より低くし、ワイピング時、パージ時、初期充填時のそれぞれでは順次記録ヘッドの印字面より高くしたことを特徴とする請求項１記載のインクジェット記録装置におけるインク供給装置。   The back pressure tank is supported by a tank lifting device so that it can be raised and lowered. With the tank lifting device, the position of the liquid surface in the back pressure tank relative to the recording head is set lower than the printing surface of the recording head during printing, and during wiping, 2. The ink supply apparatus for an ink jet recording apparatus according to claim 1, wherein the ink supply apparatus is successively higher than the print surface of the recording head at each time of purging and initial filling. 請求項２記載のインクジェット記録装置におけるインク供給装置において、記録ヘッドの印字時の高さＨ１を略−３０ｍｍ、ワイピング時の高さＨ２を略２０ｍｍ、パージ時の高さＨ３を７０±３０ｍｍ、初期充填時の高さＨ４を略３００ｍｍとしたことを特徴とするインクジェット記録装置におけるインク供給装置。

In the ink supply device in an ink jet recording apparatus according to claim 2, substantially the height H 1 during printing of the recording head -30 mm, approximately 20mm high H 2 of the wiping, the height H 3 of at purge 70 ± An ink supply device in an ink jet recording apparatus, wherein the height H 4 at the time of initial filling is set to 30 mm and approximately 300 mm.

JP2004138730A 2004-05-07 2004-05-07 Ink feeding device in inkjet recorder Pending JP2005319655A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2004138730A JP2005319655A (en) 2004-05-07 2004-05-07 Ink feeding device in inkjet recorder
DE602005014907T DE602005014907D1 (en) 2004-05-07 2005-04-22 Ink supply device for an ink jet recording apparatus
DE602005024876T DE602005024876D1 (en) 2004-05-07 2005-04-22 Ink dispenser for inkjet recorders
EP08016500A EP2025519B1 (en) 2004-05-07 2005-04-22 Ink supplier for ink jet recorder
EP05103284A EP1593519B1 (en) 2004-05-07 2005-04-22 Ink supplier for ink jet recorder
US11/115,795 US7628476B2 (en) 2004-05-07 2005-04-27 Ink supplier for ink jet recorder
CN 200510068502 CN1693087B (en) 2004-05-07 2005-04-28 Ink supplier for ink jet recorder

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US9302487B2 (en) 2012-09-07 2016-04-05 Mimaki Engineering Co., Ltd. Liquid supply device, ink jet recording device, and liquid supply method
KR20170131684A (en) * 2015-03-31 2017-11-29 시바우라 메카트로닉스 가부시끼가이샤 Tablet printing device and tablet printing method
JP2019025741A (en) * 2017-07-28 2019-02-21 京セラドキュメントソリューションズ株式会社 Supply liquid tank unit and ink-jet recording device with the same
CN110481163A (en) * 2018-05-15 2019-11-22 精工爱普生株式会社 Liquid injection apparatus

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JP2008162210A (en) * 2006-12-29 2008-07-17 Brother Ind Ltd Liquid ejector
US9302487B2 (en) 2012-09-07 2016-04-05 Mimaki Engineering Co., Ltd. Liquid supply device, ink jet recording device, and liquid supply method
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JP7005989B2 (en) 2017-07-28 2022-01-24 京セラドキュメントソリューションズ株式会社 Supply liquid tank unit and inkjet recording device equipped with it
CN110481163A (en) * 2018-05-15 2019-11-22 精工爱普生株式会社 Liquid injection apparatus
CN110481163B (en) * 2018-05-15 2022-07-05 精工爱普生株式会社 Liquid ejecting apparatus

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