JP4685370B2 - Ink supply device in ink jet recording apparatus - Google Patents

Ink supply device in ink jet recording apparatus Download PDF

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JP4685370B2
JP4685370B2 JP2004139638A JP2004139638A JP4685370B2 JP 4685370 B2 JP4685370 B2 JP 4685370B2 JP 2004139638 A JP2004139638 A JP 2004139638A JP 2004139638 A JP2004139638 A JP 2004139638A JP 4685370 B2 JP4685370 B2 JP 4685370B2
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ink
sub tank
tank
recording head
liquid level
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JP2005319694A (en
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浩幸 松葉
重幸 高尾
哲也 松崎
秀男 井沢
孝夫 並木
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Miyakoshi Printing Machinery Co Ltd
Panasonic Corp
Panasonic Holdings Corp
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Miyakoshi Printing Machinery Co Ltd
Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Application filed by Miyakoshi Printing Machinery Co Ltd, Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Miyakoshi Printing Machinery Co Ltd
Priority to EP05103284A priority patent/EP1593519B1/en
Priority to EP08016500A priority patent/EP2025519B1/en
Priority to DE602005024876T priority patent/DE602005024876D1/en
Priority to DE602005014907T priority patent/DE602005014907D1/en
Priority to US11/115,795 priority patent/US7628476B2/en
Priority to CN 200510068502 priority patent/CN1693087B/en
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本発明は、連続印字稼動が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 device that supplies ink to a recording head of an ink jet recording apparatus capable of continuous printing operation.

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は、記録ヘッドに作用する供給インク圧が一定であること、及びインク中に気泡が混入することなく行う必要がある。ところが、従来のこの種のインク供給装置において、特にインクを貯蔵するメインタンクのほかにサブタンクを用い、記録時のインクをこのサブタンクから供給し、このサブタンク内のインク量が一定値以下になったときにメインタンクよりインクを補給するようにしたインク供給装置では、サブタンクからインク供給ポンプにて記録ヘッドへインクが供給されるようになっており、またサブタンクには空気抜きが設けてあり、サブタンク内のインクの液面がこの空気抜きを介して大気に連通するようになっている（例えば、特許文献１参照）。   It is necessary to supply ink to the recording head of the ink jet recording apparatus so that the supply ink pressure acting on the recording head is constant and bubbles do not enter the ink. However, in the conventional ink supply apparatus of this type, a sub tank is used in addition to the main tank for storing ink, and ink for recording is supplied from the sub tank, and the amount of ink in the sub tank falls below a certain value. Ink supply devices that replenish ink from the main tank sometimes supply ink from the sub tank to the recording head by the ink supply pump, and the sub tank is provided with air vents. The ink liquid level communicates with the atmosphere through this air vent (see, for example, Patent Document 1).

特開平６−１０６７３１号公報JP-A-6-106731

上記従来のインク供給装置では、記録ヘッドへインク供給ポンプにてインクが供給されるようになっていることにより、インク供給ポンプの変動により、記録ヘッドへのインク供給圧が変動して印字が不安定になることがあった。また、記録ヘッドへインクを供給するタンク（サブタンク）に空気抜きが設けられていて、このタンクの液面が大気に連通していることにより、インクの液面を介して空気がインク液中に混入し、この混入空気がインクと共に記録ヘッドへ送られて、記録ヘッドのインクノズルからのインク滴の適正な吐出に障害を惹起することがあった。   In the conventional ink supply device, ink is supplied to the recording head by the ink supply pump, so that the ink supply pressure to the recording head fluctuates due to fluctuations in the ink supply pump, and printing is not possible. Sometimes it became stable. Also, air is provided in the tank (sub tank) that supplies ink to the recording head, and the liquid level of this tank communicates with the atmosphere, so that air enters the ink liquid via the ink level. However, the mixed air is sent to the recording head together with the ink, which may cause an obstacle to proper ejection of ink droplets from the ink nozzles of the recording head.

本発明は、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に、メインタンクよりインクが補充されるようにしたサブタンクを接続し、このサブタンクに、このサブタンク内のインク液面を検出する液面検出器を設け、またサブタンクにインクを供給するインク供給管に、液面検出器の検出値によってサブタンクの液面が一定になるようにメインタンクからインクをサブタンクへ供給するようにポンプ作動するように制御されるインク供給ポンプを設けて、サブタンク内のインク液面と記録ヘッドの印字面との位置水頭を一定にするようにし、上記サブタンク内に、このサブタンク内のインクの液面の略全面に接触して浮かぶフロートを内装し、上記メインタンクとサブタンクのそれぞれのインク液面より低い位置にインク循環型の脱気装置を接続し、さらに、上記メインタンクよりサブタンクへインクを供給するインク供給管とサブタンクより記録ヘッドへインクを供給するインク供給管のそれぞれをサブタンクの底面に接続した構成になっている。 The present invention has been made in order to solve the technical problems as described above, and has a configuration in which a sub tank in which ink is replenished from a main tank is connected to a recording head in an ink jet recording apparatus. The sub tank is provided with a liquid level detector that detects the ink level in the sub tank, and the ink level of the sub tank is fixed to the ink supply pipe that supplies ink to the sub tank according to the detection value of the liquid level detector. An ink supply pump that is controlled so as to pump the ink from the main tank to the sub tank is provided so that the position head of the ink liquid surface in the sub tank and the print surface of the recording head is constant, subtank, and interior float floating in contact with substantially the entire surface of the liquid surface of ink in the sub tank, the main tank and subtypes An ink circulation type deaeration device is connected to a position below each ink level of the ink, and an ink supply pipe for supplying ink from the main tank to the sub tank and an ink supply pipe for supplying ink from the sub tank to the recording head Each of these is connected to the bottom of the sub tank .

本発明によれば、記録ヘッドに接続したサブタンクのインク液面と、記録ヘッドの印字面との位置水頭が一定であることにより、記録ヘッドへのインクの供給圧（背圧）を一定に保つことができ、記録ヘッドによる印字を安定的に行うことができる。   According to the present invention, since the position head of the ink liquid surface of the sub tank connected to the recording head and the printing surface of the recording head is constant, the ink supply pressure (back pressure) to the recording head is kept constant. Therefore, printing by the recording head can be performed stably.

そして、記録ヘッドへのインクの供給圧を一定に保つ手段としてサブタンクに液面検出器を設けると共に、この液面検出器の検出値によってサブタンクの液面が一定になるようにメインタンクからインクをサブタンクへ供給するようにポンプ作動するように制御される供給ポンプを設けた構成にしたことにより、上記サブタンクの液面を一定に保つための手段を簡素な構成で得ることができる。   A liquid level detector is provided in the sub tank as a means for keeping the ink supply pressure to the recording head constant, and ink is supplied from the main tank so that the liquid level of the sub tank is constant according to the detection value of the liquid level detector. By providing the supply pump that is controlled so as to operate the pump so as to supply to the sub tank, means for keeping the liquid level of the sub tank constant can be obtained with a simple configuration.

そして、本発明によれば、記録ヘッドへインクを供給するサブタンク内に、このサブタンク内のインクの液面の略全面に接触して浮かぶフロートを内装したことにより、この液面がタンク内の大気に対して遮断され、インキ中への空気の混入を少なくでき、また、このサブタンク内のインク中の空気を脱気装置にて脱気することができることができることにより、サブタンクから記録ヘッドへ供給されるインク中に空気が混入することを制御することができ、記録ヘッドの吐出ノズルよりのインク滴吐出において空気混入による各種の障害の発生を減少させ安定した印字を可能とすることができる。
According to the present invention, the float that floats in contact with substantially the entire surface of the ink in the subtank is provided in the subtank that supplies ink to the recording head. In this case, the air in the ink can be reduced and the air in the ink in the sub tank can be deaerated by the deaeration device. It is possible to control the mixing of air into the ink, and to reduce the occurrence of various troubles due to the mixing of air in the ejection of ink droplets from the ejection nozzles of the recording head, thereby enabling stable printing.

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 a 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を介して接続したサブタンク、４はこのサブタンク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とサブタンク２とを接続するインク供給管５には、サブタンク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とフィルタ８と電磁弁９が介装してある。上記両インク供給管３，５はサブタンク２の底部、少なくともインク液面より低い位置、例えば図１に示すようにサブタンク２の底面に接続されている。
In the figure, reference numeral 1 denotes a recording head of the ink jet recording apparatus, 2 a sub tank connected to the recording head 1 via an ink supply pipe 3, and 4 a main tank connected to the sub tank 2 via an ink supply pipe 5. An ink supply pipe 5 that connects the main tank 4 and the sub tank 2 is provided with an ink supply pump 7 that replenishes ink from the main tank 4 according to the consumption amount of the ink 6 in the sub tank 2, a filter 8, and a solenoid valve 9. It is disguised. Both the ink supply pipes 3 and 5 are connected to the bottom of the sub tank 2 , at least at a position lower than the ink liquid level , for example, the bottom surface of the sub tank 2 as shown in FIG .

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).

サブタンク２内には、この中に収納されるインク６の液面の略全面に接触して浮かぶフロート１０が内装してある。またこのサブタンク２にはタンク内のフロート１０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１１が設けてある。そして上記したインク供給ポンプ７及び電磁弁９の作動が、この液面検出器１１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 sub tank 2, a float 10 that floats in contact with substantially the entire liquid surface of the ink 6 accommodated therein is provided. The sub tank 2 is provided with a liquid level detector 11 for detecting the liquid level of the ink 6 through the position of the float 10 in the tank. The operation of the ink supply pump 7 and the electromagnetic valve 9 is controlled by a control device (not shown) based on the detection value of the liquid level detector 11.

すなわち、サブタンク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１１からの信号により電磁弁９を開くと共にインク供給ポンプ７が作動してメインタンク４からサブタンク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、上記サブタンク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１１からの信号によりインク供給ポンプ７が停止されると共に電磁弁９が閉じられるようになっていて、サブタンク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 sub tank 2 is supplied to the recording head 1 through the ink supply pipe 3 and the liquid level is lowered, the signal from the liquid level detector 11 that detects the liquid level drop at this time is used. The solenoid valve 9 is opened and the ink supply pump 7 is operated to supply ink from the main tank 4 to the sub tank 2. When the ink supply amount becomes a predetermined amount and the ink liquid level in the sub tank 2 reaches a predetermined position, the ink supply pump 7 is stopped by a signal from the liquid level detector 11 for detecting this. The electromagnetic valve 9 is closed, and the liquid level of the ink 6 in the sub tank 2 is always maintained at a predetermined height.

従って、上記サブタンク２内のインク６の液面と記録ヘッド１のヘッド面との高さ方向の位置関係は一定となり、一定の位置水頭Ｈが保たれることになる。なお、サブタンク２はフィルタ１２を介して大気に連通されている。   Accordingly, the positional relationship in the height direction between the liquid level of the ink 6 in the sub-tank 2 and the head surface of the recording head 1 is constant, and a constant position head H is maintained. The sub tank 2 is communicated with the atmosphere via the filter 12.

サブタンク２のインク６の液面より低い位置に、サブタンク２内のインク６中の空気を抜くための脱気装置１３が接続してある。またメインタンク４にも、このタンク内のインク中の空気を抜くための脱気装置１４が接続してある。この両脱気装置１３，１４は循環型のものが用いられ、それぞれのタンク内のインクを各脱気装置１３，１４に通すことにより脱気するようになっている。   A deaeration device 13 for removing air in the ink 6 in the sub tank 2 is connected to a position lower than the liquid level of the ink 6 in the sub tank 2. The main tank 4 is also connected with a deaeration device 14 for removing air in the ink in the tank. Both the deaerators 13 and 14 are circulating, and are deaerated by passing the ink in the respective tanks through the deaerators 13 and 14.

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、記録ヘッド１でのインク吐出量に応じた量のインクがサブタンク２よりインク供給管３を介して供給される。この記録ヘッド１へのインクの供給は、供給系の毛細管現象及び吐出ノズル部での吐出力にて行われる。そしてこのときのサブタンク２でのインク６の液面高さは、液面検出器１１の検出値にて制御されるインク供給ポンプ７の作動により一定に保たれることにより、サブタンク２の液面に対する吐出ノズルの位置水頭Ｈが一定になって記録ヘッド１の吐出ノズル部でのインク供給圧力は一定に保たれる。   At this time, an amount of ink corresponding to the amount of ink discharged from the recording head 1 is supplied from the sub tank 2 through the ink supply pipe 3. The ink is supplied to the recording head 1 by the capillary action of the supply system and the discharge force at the discharge nozzle portion. At this time, the liquid level of the ink 6 in the sub tank 2 is kept constant by the operation of the ink supply pump 7 controlled by the detection value of the liquid level detector 11, so that the liquid level of the sub tank 2 is maintained. The position head H of the discharge nozzle with respect to the ink becomes constant, and the ink supply pressure at the discharge nozzle portion of the recording head 1 is kept constant.

またこのときのサブタンク２及びメインタンク４内のインク中の空気は、それぞれに接続して設けた脱気装置１３，１４にて脱気される。   At this time, the air in the ink in the sub tank 2 and the main tank 4 is deaerated by deaerators 13 and 14 connected to each of them.

また、サブタンク２内のインク６の液面の略全面はフロート１０にて覆われていることにより、この液面の大気と直接接触する部分が小さくなり、この液面よりインク中に大気が混入するのを少なくできる。   In addition, since almost the entire liquid surface of the ink 6 in the sub tank 2 is covered with the float 10, the portion of the liquid surface that is in direct contact with the atmosphere is reduced, and the atmosphere is mixed into the ink from the liquid surface. You can do less.

これらのことから、記録ヘッド１の吐出ノズルよりのインク滴吐出において、インク中への空気混入による各種障害の発生が減少され、安定した印刷が行われる。   For these reasons, when ink droplets are ejected from the ejection nozzles of the recording head 1, the occurrence of various obstacles due to air mixing into the ink is reduced, and stable printing is performed.

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…サブタンク、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、８，１２…フィルタ、９…電磁弁、１０…フロート、１１…液面検出器、１３，１４…脱気装置。   DESCRIPTION OF SYMBOLS 1 ... Recording head, 2 ... Sub tank, 3, 5 ... Ink supply pipe, 4 ... Main tank, 6 ... Ink, 7 ... Ink supply pump, 8, 12 ... Filter, 9 ... Solenoid valve, 10 ... Float, 11 ... Liquid Surface detector, 13, 14 ... deaeration device.

Claims (1)

インクジェット記録装置における記録ヘッドに、メインタンクよりインクが補充されるようにしたサブタンクを接続し、このサブタンクに、このサブタンク内のインク液面を検出する液面検出器を設け、またサブタンクにインクを供給するインク供給管に、液面検出器の検出値によってサブタンクの液面が一定になるようにメインタンクからインクをサブタンクへ供給するようにポンプ作動するように制御されるインク供給ポンプを設けて、サブタンク内のインク液面と記録ヘッドの印字面との位置水頭を一定にするようにし、
上記サブタンク内に、このサブタンク内のインクの液面の略全面に接触して浮かぶフロートを内装し、
上記メインタンクとサブタンクのそれぞれのインク液面より低い位置にインク循環型の脱気装置を接続し、
さらに、上記メインタンクよりサブタンクへインクを供給するインク供給管とサブタンクより記録ヘッドへインクを供給するインク供給管のそれぞれをサブタンクの底面に接続した
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 sub tank in which ink is replenished from the main tank is connected to the recording head in the ink jet recording apparatus, and a liquid level detector for detecting the ink level in the sub tank is provided in the sub tank, and ink is supplied to the sub tank. An ink supply pump that is controlled to operate the pump so as to supply ink from the main tank to the sub tank so that the liquid level of the sub tank becomes constant according to the detection value of the liquid level detector is provided in the ink supply pipe to be supplied. , Make the position head of the ink liquid level in the sub tank and the print surface of the recording head constant,
Inside the sub tank, a float that floats in contact with substantially the entire surface of the ink in the sub tank is provided ,
An ink circulation type deaeration device is connected to a position lower than the ink level of each of the main tank and the sub tank,
An ink supply apparatus in an ink jet recording apparatus, wherein an ink supply pipe for supplying ink from the main tank to the sub tank and an ink supply pipe for supplying ink from the sub tank to the recording head are connected to the bottom surface of the sub tank .
JP2004139638A 2004-05-07 2004-05-10 Ink supply device in ink jet recording apparatus Active JP4685370B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2004139638A JP4685370B2 (en) 2004-05-10 2004-05-10 Ink supply device in ink jet recording apparatus
EP08016500A EP2025519B1 (en) 2004-05-07 2005-04-22 Ink supplier for ink jet recorder
DE602005024876T DE602005024876D1 (en) 2004-05-07 2005-04-22 Ink dispenser for inkjet recorders
DE602005014907T DE602005014907D1 (en) 2004-05-07 2005-04-22 Ink supply device for an ink jet recording apparatus
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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