JPS58212955A - Ink jet recorder - Google Patents

Ink jet recorder

Info

Publication number
JPS58212955A
JPS58212955A JP9649882A JP9649882A JPS58212955A JP S58212955 A JPS58212955 A JP S58212955A JP 9649882 A JP9649882 A JP 9649882A JP 9649882 A JP9649882 A JP 9649882A JP S58212955 A JPS58212955 A JP S58212955A
Authority
JP
Japan
Prior art keywords
ink
temperature
pressure
head
gutter
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP9649882A
Other languages
Japanese (ja)
Inventor
Minoru Ameyama
飴山　実
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP9649882A priority Critical patent/JPS58212955A/en
Priority to DE19833318498 priority patent/DE3318498A1/en
Publication of JPS58212955A publication Critical patent/JPS58212955A/en
Pending legal-status Critical Current

Links

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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/195—Ink jet characterised by ink handling for monitoring ink quality

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)

Abstract

PURPOSE:To control the viscosity of ink for a long period of time by such an arrangement wherein the pressure of ink to be supplied is detected and ink recovered by a gutter is extracted by the output thereof. CONSTITUTION:Ink droplets from a head 1 are selectively given with electric charge and they are caused to record a character, etc. on a sheet of recording paper 5. Ink droplets not defleced go straight and they are caught by a gutter 4 and then sent to an ink tank 9 through a three-way valve 7 by a recovery pump 6. The ink is heated to a fixed temperature by a heater 14 and sent to the head 1. The temperature of ink is detected by a temperature detector 15, and if it falls below T2, ink is heated by the heater 14 and its temperature is maintained at T2 at all times. The pressure of ink from a fixed flow rate type pump 11 is detected by a pressure detector 12, and if it is higher than the upper limit P<max>, a three-way control circuit 16 opens a valve 7 for a fixed length of time, and ink recovered by the gutter 4 is discarded into a waste tank 8 and new ink is supplied from a cartridge 10.

Description

【発明の詳細な説明】 インクジエノト記録装置に関するものである。[Detailed description of the invention] This invention relates to an inkjet recording device.

ヘノドのノズルよりインクを噴射し、高周波振動によυ
インクを滴化し、個々のインク滴を選択的し荷電、偏向
して文字または図形を記録するようにした荷電偏向型イ
ンクジェット記録装置では、インクの滴化はインクの物
性値（特に表面張力と粘度）に依存する０しかるに、ヘ
ッドのノズルから噴射されて回収されたインクは、飛翔
中に、またガターで回収されて流れるときに水分が蒸発
するだめ、物性値が経時的に変化し、インクの粘度があ
る値以上になると、好ましい滴化が得られなくなり、従
って、好ましい印字が得られなくなるという欠点があっ
た。Ink is ejected from the nozzle of the henod, and υ is generated by high-frequency vibration.
In a charge deflection type inkjet recording device, which forms ink into droplets and selectively charges and deflects each ink droplet to record characters or figures, forming ink into droplets depends on the physical properties of the ink (particularly surface tension and viscosity). ) However, as the ink ejected and collected from the nozzles of the head evaporates during flight and as it collects in the gutter and flows, its physical properties change over time, and the ink's physical properties change over time. When the viscosity exceeds a certain value, there is a drawback that preferred droplet formation cannot be obtained and, therefore, preferred printing cannot be obtained.

この欠点を解消するだめに、インクの粘度を検出１〜、
インクの粘性がある値以上になると、希釈液を加木てイ
ンクの粘度を一定にする装置が提案されているが、イン
クの粘度を検出する装置の操作が複雑で、インクの粘度
をある許容範囲に制御することが困難であるという欠点
があった。In order to solve this drawback, the viscosity of the ink must be detected from 1 to 1.
A device has been proposed to keep the viscosity of the ink constant by adding a diluent when the viscosity of the ink exceeds a certain value, but the device that detects the viscosity of the ink is complicated to operate, There was a drawback that it was difficult to control within the range.

本発明は、上記従来例の欠点を解消するだめに、゛　イ
ンクの供給圧力を検出する圧力検出手段からの出力でガ
ターで回収された回収インクを抜き取るか、またはヘッ
ド近傍のインクの温度または雰囲気温度を検出する温度
検出手段と圧力検出手段の出力によって、ガターで回収
された回収インクの抜き取り量を制御する手段を設ける
ことを特徴とし、その目的はインクの物性値を長期間許
容範囲内に押えるよってしたインクジェット記録装置を
提供するものである。以下、図面により実施例を詳細に
説明する。In order to solve the above-mentioned drawbacks of the conventional example, the present invention aims to extract the recovered ink collected in the gutter using the output from the pressure detection means that detects the ink supply pressure, or to detect the temperature or atmosphere of the ink near the head. The invention is characterized by providing means for controlling the amount of collected ink collected in the gutter based on the outputs of the temperature detecting means for detecting temperature and the pressure detecting means. The present invention provides an inkjet recording device that can be pressed down. Hereinafter, embodiments will be described in detail with reference to the drawings.

第１図は、本発明の一実施例のインクジェット記録装置
のブロック図を示したもので、１はヘッド、２は荷電電
極、３は偏向電極、４はガター、５は記録紙、６は回収
ポンプ、７は三方パルプ、８は廃液タンク、９は供給タ
ンク、１０はカートリッジ、１１は供給ポンプ、１２は
圧力検出器、１３はパルプ、１４はヒーター、１５は温
度検出器、１もは三方パルプ制御回路、１７はヒーター
制御回路である。FIG. 1 shows a block diagram of an inkjet recording apparatus according to an embodiment of the present invention, in which 1 is a head, 2 is a charging electrode, 3 is a deflection electrode, 4 is a gutter, 5 is a recording paper, and 6 is a collection. Pump, 7 is a three-way pulp, 8 is a waste liquid tank, 9 is a supply tank, 10 is a cartridge, 11 is a supply pump, 12 is a pressure detector, 13 is a pulp, 14 is a heater, 15 is a temperature sensor, 1 is also a three-way A pulp control circuit, 17 is a heater control circuit.

このように構成された本実施例のインクジェット記録装
置では、ヘッド１のノズルから噴射されたインクは、ヘ
ッド１における電歪振動子の高周波振動によりインク滴
となるが、このインクがインク滴となるときに、選択的
に荷電電極２で電荷を与えると、偏向電極３で偏向され
て記録紙５に達し、記録紙５に文字や図形を記録する。In the inkjet recording apparatus of this embodiment configured in this way, the ink ejected from the nozzles of the head 1 becomes ink droplets due to the high frequency vibration of the electrostrictive vibrator in the head 1; When a charge is selectively applied by the charging electrode 2, it is deflected by the deflection electrode 3 and reaches the recording paper 5, thereby recording characters or figures on the recording paper 5.

荷電電極２で電荷が与えられないインク滴は直進し、ガ
ター４で捕捉され、回収ポンプ６で三方パルプ７を通っ
てインクタンク９に送られる。インクタンク９のインク
は供給ポンプ１１によりバルブ１３を通り、ヒーター１
４で予め定めた一定温度に加熱されてヘーノド１へ送ら
れる。々お、インクタンク９のインクが少なくなると、
カートリッジ１０から新しいインクが供給され、インク
タンク９の液面は常に一定の液位になっている。まだ供
給ポンプ１１で加圧されてヘッド１に送られるインクσ
流量は常に一定であり、更に温度検出器１５でインクの
温度が検知され、インクの温度がＴ２以下になった場合
は、ヒーター１４でインクが加熱され、ヒーター制御回
路１７でインクの温度が常にＴ２（第２図参照）になる
ように制御されている。Ink droplets that are not charged by the charging electrode 2 travel straight, are captured by the gutter 4, and are sent to the ink tank 9 through the three-way pulp 7 by the recovery pump 6. The ink in the ink tank 9 is passed through the valve 13 by the supply pump 11 and is then supplied to the heater 1.
4, it is heated to a predetermined constant temperature and sent to Henode 1. Oh, when the ink in the ink tank 9 gets low,
New ink is supplied from the cartridge 10, and the liquid level in the ink tank 9 is always at a constant level. Ink σ still being pressurized by the supply pump 11 and sent to the head 1
The flow rate is always constant, and when the temperature of the ink is detected by the temperature detector 15 and the temperature of the ink is below T2, the ink is heated by the heater 14, and the temperature of the ink is always maintained by the heater control circuit 17. It is controlled to become T2 (see FIG. 2).

ここで、第２図に示しだように、ヘッド１から噴射され
たインク滴が適切な粒子化状態を維持するだめのインク
の粘度の上限をμｍ’ａχとすると、供給ポンプ１１か
ら供給されるインクの流量が一定であるので、即ち、供
給ポンプとして定流量型ポンプを使用しているので、圧
力検出器１２で検出した時の圧力はｐ　’ｎＬＱχとな
る。また第２図において、曲線Ｂ７１　　は標準インク
の温度に対する粘度特性を示１−ており・曲線Ｂｐ　　
はその時の圧力特性を示しているが、インクが低温時に
は、インクの粒子化に適性が得られないため、一般には
ヒーター１４でインク温度をＴ２に維持するように制御
している。また、ヘッド１から噴射したインク滴で記録
に供されないものはガター４で回収されるが、このイン
ク滴の飛翔時に水分が蒸発してインクの粘度が上昇する
ので、回収されたインクが回収ポンプ６でインクタンク
９に供給されると、インクタンク９のインクの粘度が上
昇する。このインクの温度がＴ２の場合の粘度特性の限
界は、第２図の曲線Ａ２．で示され、曲線Ａ、はその時
の圧力特性となる。従って、インクの粘度を曲線Ａ１．
とＢ、１の間になるよう圧制御する必要がある。Here, as shown in FIG. 2, if the upper limit of the viscosity of the ink required to maintain the appropriate atomization state of the ink droplets ejected from the head 1 is μm'aχ, then the ink that is supplied from the supply pump 11 is Since the flow rate of the ink is constant, that is, since a constant flow type pump is used as the supply pump, the pressure detected by the pressure detector 12 is p'nLQχ. In addition, in FIG. 2, curve B71 shows the viscosity characteristics of standard ink with respect to temperature.
shows the pressure characteristics at that time, but when the ink is at a low temperature, it is not suitable for ink particle formation, so the ink temperature is generally controlled to be maintained at T2 by the heater 14. Also, ink droplets ejected from the head 1 that are not used for recording are collected by the gutter 4, but when these ink droplets fly, water evaporates and the viscosity of the ink increases, so the collected ink is pumped into the collection pump. When the ink is supplied to the ink tank 9 at step 6, the viscosity of the ink in the ink tank 9 increases. The limit of the viscosity characteristics when the temperature of this ink is T2 is the curve A2 in FIG. The curve A is the pressure characteristic at that time. Therefore, the viscosity of the ink is set to curve A1.
It is necessary to control the pressure so that it is between B and 1.

そこで、本発明では、圧力検知器１２が第２図に示した
圧力の上限ｐ　ｍＱ　２以上を検知した場合、三方パル
プ制御回路１６によって予め定められた一定時間三方バ
ルプ７を開き、ガター４で回収されたインクを廃棄タン
ク８に廃棄する。従って、供給タンク９に回収インクが
供給されなくなると、供給タンク９のインクの液面が下
がり、カートリッジ１０から新しいインクが補給される
。Therefore, in the present invention, when the pressure detector 12 detects the pressure upper limit p mQ 2 or more shown in FIG. The collected ink is disposed of in a waste tank 8. Therefore, when the recovered ink is no longer supplied to the supply tank 9, the liquid level of the ink in the supply tank 9 drops, and new ink is replenished from the cartridge 10.

このようにすることにより、インクの供給圧力を第２図
の曲線Ａ　とＢ、の間になるように制御することができ
る。By doing so, the ink supply pressure can be controlled to be between curves A and B in FIG.

また、予め第２図の曲線Ａ、を三方パルプ制御回路１６
に記憶させておき、圧力検出器１２と温度検出器１５の
出力が曲線Ａｐより上の場合は、三方パルプ７を開いて
回収インクを排棄する。まだ圧力検出１２と温度検出器
１５の出力と曲線Ａ。In addition, curve A in FIG.
If the outputs of the pressure detector 12 and temperature sensor 15 are above the curve Ap, the three-way pulp 7 is opened and the recovered ink is discharged. Still the output of pressure sensor 12 and temperature sensor 15 and curve A.

との差より、三方パルプ７の開き時間を制御することも
できる。更に、圧力検出器１２の出力がｐ　ｍａχを越
えた場合に、三方パルプ７を開いて回収インクを廃棄タ
ンク８に廃棄してもよい。その場合は温度検出器１５の
検出温度に応じて、三方バルブの開き時間を三方法パル
プ制御回路１６で制御することができる。The opening time of the three-way pulp 7 can also be controlled based on the difference. Furthermore, when the output of the pressure detector 12 exceeds p maχ, the three-way pulp 7 may be opened and the recovered ink may be disposed of in the waste tank 8. In that case, the opening time of the three-way valve can be controlled by the three-way pulp control circuit 16 according to the temperature detected by the temperature detector 15.

以上説明したように、本発明によれば、圧力検出器でイ
ンクの供給圧力を検出することにより、また温度検出器
と圧力検出器の出力により、それらの値に応じてガター
で回収された回収インクを廃棄し、カートリッジから新
しいインクを供給すること罠より、インクの粘度を長期
間ある許容範囲に押えることができるという利点がある
。As explained above, according to the present invention, the ink supply pressure is detected by the pressure detector, and the ink collected by the gutter is determined according to the outputs of the temperature detector and the pressure detector. The advantage is that the viscosity of the ink can be kept within a certain acceptable range for a long period of time, rather than discarding the ink and supplying new ink from a cartridge.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本発明の一実施例のブロック図、第２図は、
インクの粘度と圧力との関係を示しだ図である。 １・・ヘッド、２　・荷電電極、３・・偏向電極、４・
ガター、５・記録紙、６　・回収ポンプ、７　三方バル
ブ、８・・廃棄タンク、９・・供給タンク、１０・・・
カートリッジ、１１・供給ボ／プ、１２−・圧力検出器
、１３・・バルブ、１４・・・ヒーター、１５・・・温
度検出器、１６・・三方バルブ制御回路、１７・・ヒー
ター制御回路。 第　　１ １捕 一１□１−■岬−■■■訃 第　　２　　図 ′−コ ８１FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a diagram showing the relationship between ink viscosity and pressure. 1. Head, 2. Charge electrode, 3. Deflection electrode, 4.
Gutter, 5. Recording paper, 6. Recovery pump, 7. Three-way valve, 8.. Waste tank, 9.. Supply tank, 10.
Cartridge, 11. Supply valve, 12.. Pressure detector, 13.. Valve, 14.. Heater, 15.. Temperature detector, 16.. Three-way valve control circuit, 17.. Heater control circuit. Part 1 1 1□1-■Misaki-■■■Death Part 2 Figure'-ko81

Claims (2)

【特許請求の範囲】[Claims] （１）定流量型ポンプでインクをヘッドへ加圧供給する
荷電偏向型インクジェット記録装置において、前記ヘッ
ドへ供給するインクの圧力を検出する圧力検出手段と、
該圧力検出手段からの出力によってガターで回収された
インクを廃液タンクへ抜くようにしたことを特徴とする
インクジェット記録装置。(1) In a charge deflection type inkjet recording device that supplies ink under pressure to a head using a constant flow pump, a pressure detection means for detecting the pressure of ink supplied to the head;
An inkjet recording apparatus characterized in that ink collected in a gutter is drained into a waste liquid tank according to an output from the pressure detection means. （２）前記圧力検出手段と前記ヘッド近傍のインクの温
度または雰囲気温度を検出する温度検出手段との出力に
より、前記回収されたインクを抜く量を決定する手段を
設けることを特徴とする特許梢求ノ範囲第１項記載のイ
ンクジェット記録装置。(2) The patented invention is characterized by providing means for determining the amount of the collected ink to be drained based on the outputs of the pressure detecting means and the temperature detecting means for detecting the temperature of the ink or the ambient temperature near the head. The inkjet recording device according to item 1 of the desired scope.
JP9649882A 1982-05-20 1982-06-05 Ink jet recorder Pending JPS58212955A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP9649882A JPS58212955A (en) 1982-06-05 1982-06-05 Ink jet recorder
DE19833318498 DE3318498A1 (en) 1982-05-20 1983-05-20 Ink jet printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9649882A JPS58212955A (en) 1982-06-05 1982-06-05 Ink jet recorder

Publications (1)

Publication Number Publication Date
JPS58212955A true JPS58212955A (en) 1983-12-10

Family

ID=14166753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9649882A Pending JPS58212955A (en) 1982-05-20 1982-06-05 Ink jet recorder

Country Status (1)

Country Link
JP (1) JPS58212955A (en)

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