JPS5851160A - Ink jet recorder - Google Patents
Ink jet recorderInfo
- Publication number
- JPS5851160A JPS5851160A JP14982581A JP14982581A JPS5851160A JP S5851160 A JPS5851160 A JP S5851160A JP 14982581 A JP14982581 A JP 14982581A JP 14982581 A JP14982581 A JP 14982581A JP S5851160 A JPS5851160 A JP S5851160A
- Authority
- JP
- Japan
- Prior art keywords
- ink
- air bubbles
- head
- cooling
- ink jet
- 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
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
- B41J2/19—Ink jet characterised by ink handling for removing air bubbles
Abstract
Description
【発明の詳細な説明】
本発明は、インクジェット記録装置に係り、特に、イン
クジェットヘッドに該ヘッド内の気泡を検出する気泡検
出装置及び該ヘッドを冷却する冷却装置を設け、ヘッド
内の気泡が所定量以上に達した時に前記冷却装置を駆動
してインク温匣を低下し、もって、前記気泡をインク液
中に浴かし込むようにしたインクジェット記録装置に係
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inkjet recording apparatus, and in particular, an inkjet head is provided with a bubble detection device for detecting air bubbles in the head and a cooling device for cooling the head, so that air bubbles in the head can be detected in a certain place. The present invention relates to an inkjet recording apparatus in which the cooling device is driven to lower the ink warming bag when the amount reaches a fixed amount or more, thereby bathing the air bubbles into the ink liquid.
現在、棟々のインクジェット記録装置が提案でれている
が、インク液中に気泡（インク未充填部分も含む）が存
在すると、インクが圧縮性となシ、インク噴射機能に種
々の悪影響を及ぼす。Currently, many inkjet recording devices have been proposed, but if there are bubbles in the ink liquid (including areas that are not filled with ink), the ink becomes compressible and has various negative effects on the ink jetting function. .
第１図は、周知のインクオンデマンド型のインクジェッ
ト記録装置の要部概略時面図で、図中、１はインクジェ
ットヘッド、２はノズル孔、３は電イ）振動子、４はイ
ンク液室、５はインク供給菅で、周知のように、電歪伽
動子３にパルス信号電圧金与え、その歪み功、象により
、インク液室の体積全縮小させて該インク液室内のイン
クに圧力を与え、そのパルス圧力によってノズル孔２よ
りインク滴を噴射させるようにしている。しかし、この
場合、インク液室４内に、第２図に示すように、気泡６
が存在すると、インクが非圧縮性から圧縮性を呈するよ
うになり、インク噴射効率が著しく低下したり、インク
噴射機能が停止したりする。FIG. 1 is a schematic chronological view of the main parts of a well-known ink-on-demand type inkjet recording device. In the figure, 1 is an inkjet head, 2 is a nozzle hole, 3 is an electric vibrator, and 4 is an ink liquid chamber. , 5 is an ink supply tube, which, as is well known, applies a pulse signal voltage to the electrostrictive transducer 3, and due to its distortion effect, the volume of the ink liquid chamber is completely reduced and pressure is applied to the ink in the ink liquid chamber. is applied, and ink droplets are ejected from the nozzle hole 2 by the pulse pressure. However, in this case, as shown in FIG.
If this exists, the ink changes from incompressible to compressible, resulting in a significant drop in ink jetting efficiency or a stoppage of the ink jetting function.
そこで、従来より、この気泡の混入を防止したり、混入
した気泡を除去する方法が輝々提案されているが、気泡
の混入を防止する方法にしても、インク供給側からの気
泡の混入は防止できるものの、ノズル孔側からの気泡の
混入は防止できず、また、混入した気泡を除去する方、
法にしても、装置が大損りとなったり、完全に除去し得
るものではなか本発明は、上述のごとき実情に鑑みてな
きれたもので、特に、インクジェットヘッドのインク液
室内に混入した気泡を簡易な構成で確実に除去し得るよ
うにしたインクジェット記録装置を提供しようと゛する
ものである。Therefore, many methods have been proposed in the past to prevent the inclusion of air bubbles or to remove the air bubbles that have entered, but even with methods that prevent the inclusion of air bubbles, it is still possible to prevent air bubbles from entering from the ink supply side. Although it can be done, it cannot prevent air bubbles from entering from the nozzle hole side, and it is difficult to prevent air bubbles from entering from the nozzle hole side.
However, the present invention was developed in view of the above-mentioned circumstances.In particular, the present invention was developed to prevent air bubbles from entering the ink liquid chamber of an inkjet head. It is an object of the present invention to provide an inkjet recording apparatus that can reliably remove ink with a simple configuration.
第３図は、本発明によるインクジエツＢピ録装置１つ一
笑施例を説明するだめの概略構成図で、図中、７はフィ
ルタ、８はインクタンク、９は気泡検出回路及びインク
噴射駆動回路、１０は冷却素子（ペルチェ効果素子）、
１１は冷却素子駆動回路で、図示のように、インクジェ
ットヘッド内の気泡を検出する気泡検出回路、インクジ
ェットヘッドを冷却する冷却装置、及び、該冷却装置肯
を駆動する冷却素子駆動回路とを具備している。FIG. 3 is a schematic configuration diagram for explaining an embodiment of the inkjet B recording device according to the present invention, in which 7 is a filter, 8 is an ink tank, 9 is a bubble detection circuit and an ink jet drive circuit. , 10 is a cooling element (Peltier effect element),
Reference numeral 11 denotes a cooling element driving circuit, which, as shown in the figure, includes a bubble detection circuit for detecting air bubbles in the inkjet head, a cooling device for cooling the inkjet head, and a cooling element driving circuit for driving the cooling device. ing.
第４図は、第３図に示した気泡検出回路兼インク噴射駆
動回路９の詳細図であるが、これは本出願人が既に提案
したもの（特開昭５１−１１７５３０号公報参照）であ
るので、ここでは、要点のみ簡、単に説明する。第４図
において、今、所定のパルス幅をもったパルス電圧がナ
ンドゲ−１・回路２０に加えられると、トランジスタＴ
ｒ がオフ、トランジスタＴｒ２がオンとなって電歪
振動子３に高電圧のパルス電圧全印加し、該電歪振動子
３を躯＠する。このようにしてパルス駆動された電歪振
動子３は周知のように歪を生じ、この歪によりインクジ
ェットヘッド１党インク液室の体積が減少し、このため
、インク液室内のインクに圧力が加わってノズル孔２よ
りインク滴となって噴射ざ、れ、パルス′亀圧がなくな
って電歪振動子３の歪がなくなると、インク液室４０体
積かもと１１こ戻り、インク供給管５よりインク液室に
新インクが補給される。FIG. 4 is a detailed diagram of the bubble detection circuit and ink jet drive circuit 9 shown in FIG. 3, which was already proposed by the applicant (see Japanese Patent Laid-Open No. 117530/1983). Therefore, only the main points will be briefly explained here. In FIG. 4, when a pulse voltage with a predetermined pulse width is applied to the NAND gate 1 circuit 20, the transistor T
r is turned off, transistor Tr2 is turned on, and a full high-voltage pulse voltage is applied to the electrostrictive vibrator 3, causing the electrostrictive vibrator 3 to move. As is well known, the electrostrictive vibrator 3 pulse-driven in this manner causes distortion, and this distortion causes the volume of the ink chamber in the inkjet head to decrease, and as a result, pressure is applied to the ink in the ink chamber. The ink droplets are ejected from the nozzle hole 2, and when the pulse pressure disappears and the strain on the electrostrictive vibrator 3 disappears, the volume of the ink liquid chamber 40 returns to 11, and ink is released from the ink supply pipe 5. New ink is replenished into the liquid chamber.
この時、インク液室４に気泡が存在したり、インク液室
にインクが充填されていない時は、電歪振動子３側から
見たモーショナルインピーダンスがある周波数で急激に
変化し、周波数特性上にピーりが存在するようになる。At this time, if there are bubbles in the ink chamber 4 or if the ink chamber is not filled with ink, the motional impedance seen from the electrostrictive vibrator 3 side changes rapidly at a certain frequency, and the frequency characteristics There will be a peel on the top.
そのため、電歪振動子３は前述のようにしてパルス駆動
された時にこのパルス波に含まれている高調波成分のあ
る周波数で共振振動を起こし、その端子間電圧は、駆動
パルス電圧に振動電圧が重畳された形のパルス電圧とな
るので、この振動電圧成分を検出すれば、インク液室内
に気泡が存在するか否かを検知することができる。第４
図において、ツェナーダイオード２１、可変抵抗器２２
、フィルター回路ｚ３、整流回路２４、電圧比較回路部
等は、前記振動電圧成分を検出するためのもので、′電
圧比較回路２５の比較電圧を可変抵抗器２２によって予
め設定しておくことにより、インク液室内に気泡が生じ
てインク滴噴射機能の効率が許容値以下に落ちた時に電
圧比較回路５の出力が冒電位となるようにしておけば、
この電圧比較回路部の出力電圧によりインク液室内に気
泡が生じたか否かを検出することができる。Therefore, when the electrostrictive vibrator 3 is pulse-driven as described above, it causes resonance vibration at a certain frequency of the harmonic component contained in this pulse wave, and the voltage between its terminals is the oscillating voltage added to the driving pulse voltage. Since the pulse voltage has a superimposed form, by detecting this oscillating voltage component, it is possible to detect whether or not air bubbles are present in the ink liquid chamber. Fourth
In the figure, a Zener diode 21, a variable resistor 22
, the filter circuit z3, the rectifier circuit 24, the voltage comparison circuit section, etc. are for detecting the oscillating voltage component, and by setting the comparison voltage of the voltage comparison circuit 25 in advance with the variable resistor 22, If bubbles are generated in the ink liquid chamber and the efficiency of the ink droplet jetting function falls below an allowable value, the output of the voltage comparator circuit 5 becomes an open potential.
Based on the output voltage of this voltage comparison circuit section, it is possible to detect whether or not bubbles are generated in the ink liquid chamber.
第５図は、第３図に示した冷却素子駆動回路１１の詳細
電気回路図で、図中、３１はモノマルチバイブレータ、
３２はインバータで、前述のようにして、電圧比較回路
部の出力電圧が高電圧に変化するとモノマルチバイブレ
ータ、う１が作動してインバータ３２が作動し、トラン
ジスタＴｒ３がオフ、トランジスタＴｒ４がオンとなっ
て冷却素子１０が駆動され、インクジェットヘッドｌが
冷却される。FIG. 5 is a detailed electrical circuit diagram of the cooling element drive circuit 11 shown in FIG. 3, in which 31 is a mono-multivibrator;
32 is an inverter, and as described above, when the output voltage of the voltage comparator circuit section changes to a high voltage, the monomultivibrator 1 is activated, the inverter 32 is activated, the transistor Tr3 is turned off, and the transistor Tr4 is turned on. The cooling element 10 is then driven, and the inkjet head 1 is cooled.
ところで、水（水浴性インクはほとんど水と考えてよい
）は、温度を下げると空気の溶存量が増加するので、イ
ンクジェットヘッドのインク液室内に気泡が存在する場
合に、前述のようにして、インクジェットヘッドの温顔
を下けると、インク液室内の気泡がインクの中に溶は込
んでしまい、インク液は最早圧縮性を示さず、従って、
インク噴射駆動圧力波が吸収きれることはなく、インク
ジェットヘッドのインク噴射機能が損われるようなこと
はない。従って、インク噴射を続行すれば、気泡を溶か
し込んだインクはインク滴となってノズル孔より吐出さ
れ、インク液室内のインクは、インクタンクから供給さ
れる新インクと入れ替わる０
以上の説明から明らかなように、本発明によると、イン
クジェットヘッドのインク液内に混入した気泡を藺牟々
構成によって確実に除去することができる。By the way, the amount of dissolved air in water (water-bathable ink can be thought of as mostly water) increases when the temperature is lowered, so if there are air bubbles in the ink liquid chamber of the inkjet head, as mentioned above, When the warm face of the inkjet head is lowered, the air bubbles in the ink liquid chamber will dissolve into the ink, and the ink liquid will no longer exhibit compressibility.
The ink ejection drive pressure waves are never completely absorbed, and the ink ejection function of the ink jet head is not impaired. Therefore, if ink jetting is continued, the ink with the bubbles dissolved becomes ink droplets and is jetted out from the nozzle hole, and the ink in the ink chamber is replaced with new ink supplied from the ink tank.0 It is clear from the above explanation. As described above, according to the present invention, air bubbles mixed into the ink liquid of the inkjet head can be reliably removed by the continuous structure.
第１図は、従来のインクオンデマンド型インクジェット
記録装置の要部概略構成図、第２図は、インクジェット
ヘッドのインク液室内に気泡が存在する場合の一例を示
す要部構成図、第３図は、本発明によるインクジェット
記録装置の一実施例を説明するだめの概略構成図、第４
図は、第３図に示した気泡検出回路兼インク噴射駆動回
路９の詳細電気回路図、第５図は、第３図に示しだ冷却
素子駆動回路１１の詳細電気回路図である。
１ インクジェットヘッド、２ ノズル孔、３′亀歪振
動子、４ インク液室、５ インク供給管、６ 気泡、
７ フィルター、８・インクタンク、９−気泡検出回路
及びインク噴射駆動回路、］０冷却素子、１１ 冷却
素子駆動回路。FIG. 1 is a schematic diagram of the main parts of a conventional ink-on-demand type inkjet recording device, FIG. 2 is a diagram of the main parts showing an example of a case where air bubbles exist in the ink chamber of an inkjet head, and FIG. 4 is a schematic configuration diagram for explaining one embodiment of the inkjet recording apparatus according to the present invention.
3 is a detailed electrical circuit diagram of the bubble detection circuit and ink jet drive circuit 9 shown in FIG. 3, and FIG. 5 is a detailed electrical circuit diagram of the cooling element drive circuit 11 shown in FIG. 3. 1 inkjet head, 2 nozzle hole, 3' turtle distortion oscillator, 4 ink liquid chamber, 5 ink supply pipe, 6 air bubble,
7 Filter, 8 Ink tank, 9 Bubble detection circuit and ink ejection drive circuit, ] 0 Cooling element, 11 Cooling element drive circuit.
Claims (1)
と、インクジェットヘッドを冷却する冷却装置とを具備
し、前記気泡検出装置が所定量以上の気泡を検出した時
に、前記冷却装置を駆動するようにしたことを＠徴とす
るインクジェット記録装置。The apparatus includes a bubble detection device for detecting bubbles in an inkjet head and a cooling device for cooling the inkjet head, and the cooling device is driven when the bubble detection device detects a predetermined amount or more of bubbles. An inkjet recording device with @ symbol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14982581A JPS5851160A (en) | 1981-09-21 | 1981-09-21 | Ink jet recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14982581A JPS5851160A (en) | 1981-09-21 | 1981-09-21 | Ink jet recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5851160A true JPS5851160A (en) | 1983-03-25 |
Family
ID=15483506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14982581A Pending JPS5851160A (en) | 1981-09-21 | 1981-09-21 | Ink jet recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5851160A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6249680U (en) * | 1985-09-17 | 1987-03-27 | ||
| JPH0669397U (en) * | 1993-03-18 | 1994-09-30 | 新明和工業株式会社 | Silencer for underwater blower |
| GB2282128A (en) * | 1993-04-26 | 1995-03-29 | Pentel Kk | Tape dispenser |
| US5500657A (en) * | 1991-11-11 | 1996-03-19 | Alps Electric Co., Ltd. | Air-bubble detection apparatus of ink jet recording head, and method and apparatus for restoring ink jet recording head |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5451837A (en) * | 1977-09-30 | 1979-04-24 | Ricoh Co Ltd | Ink jet head device |
| JPS54139534A (en) * | 1978-04-20 | 1979-10-30 | Ricoh Co Ltd | Air bubble remover of ink jet recorder |
| JPS5517469A (en) * | 1978-07-24 | 1980-02-06 | Komuta Norio | Vertical measurement method for building |
| JPS5567469A (en) * | 1978-11-16 | 1980-05-21 | Ricoh Co Ltd | Bubble removing device |
| JPS5630869A (en) * | 1979-08-23 | 1981-03-28 | Fuji Xerox Co Ltd | Ink feeder in ink jet printer |
-
1981
- 1981-09-21 JP JP14982581A patent/JPS5851160A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5451837A (en) * | 1977-09-30 | 1979-04-24 | Ricoh Co Ltd | Ink jet head device |
| JPS54139534A (en) * | 1978-04-20 | 1979-10-30 | Ricoh Co Ltd | Air bubble remover of ink jet recorder |
| JPS5517469A (en) * | 1978-07-24 | 1980-02-06 | Komuta Norio | Vertical measurement method for building |
| JPS5567469A (en) * | 1978-11-16 | 1980-05-21 | Ricoh Co Ltd | Bubble removing device |
| JPS5630869A (en) * | 1979-08-23 | 1981-03-28 | Fuji Xerox Co Ltd | Ink feeder in ink jet printer |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6249680U (en) * | 1985-09-17 | 1987-03-27 | ||
| JPH0335903Y2 (en) * | 1985-09-17 | 1991-07-30 | ||
| US5500657A (en) * | 1991-11-11 | 1996-03-19 | Alps Electric Co., Ltd. | Air-bubble detection apparatus of ink jet recording head, and method and apparatus for restoring ink jet recording head |
| JPH0669397U (en) * | 1993-03-18 | 1994-09-30 | 新明和工業株式会社 | Silencer for underwater blower |
| GB2282128A (en) * | 1993-04-26 | 1995-03-29 | Pentel Kk | Tape dispenser |
| US5595626A (en) * | 1993-04-26 | 1997-01-21 | Pentel Kabushiki Kaisha | Tape dispenser |
| GB2282128B (en) * | 1993-04-26 | 1997-07-16 | Pentel Kk | Tape dispenser |
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