JPS58112748A - Ink jet head - Google Patents
Ink jet headInfo
- Publication number
- JPS58112748A JPS58112748A JP20955981A JP20955981A JPS58112748A JP S58112748 A JPS58112748 A JP S58112748A JP 20955981 A JP20955981 A JP 20955981A JP 20955981 A JP20955981 A JP 20955981A JP S58112748 A JPS58112748 A JP S58112748A
- Authority
- JP
- Japan
- Prior art keywords
- liquid chamber
- nozzle
- ink
- air
- inkjet head
- 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、改良されたインクジェットヘッドに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved inkjet head.
インクジェットヘッドにインクを加圧供給してノズルか
ら噴射し、この噴射したジェット流の先端を連続的に切
断して滴化し、このインク滴を選択的に荷電、偏向して
印写する荷電偏向型インクジェット印写装置では、イン
クの噴射を停止するときは瞬時に止まる。よう忙するこ
とが必要である。A charge deflection type that supplies ink under pressure to an inkjet head and ejects it from a nozzle, continuously cuts the tip of the ejected jet stream to form droplets, and selectively charges and deflects these ink droplets for printing. In an inkjet printing device, ink jetting stops instantaneously. It is necessary to be busy.
これが瞬時に止まらず、噴射の勢いが徐々に表える過渡
状態があると、インクが下方にだれてノズル前方に配置
した偏向電極や荷電電極を汚してしまい、荷電、偏向の
トラブルの原因となるばかりでなく、インクが導電性で
、高圧のかかる電極もあるので、装置損傷の要因ともな
る。また、ノズル周辺がインクの垂れによって汚れると
噴射方向が狂ってしまい、正常な印写ができないという
問題が発生する。従って、インク供給路にある電磁弁を
閉じた際、インクの噴射が瞬時に止まるように、インク
）エツトヘッドの液室内が瞬間的に負圧になるように設
定されている。If this does not stop instantaneously and there is a transient state where the jetting force gradually appears, the ink will drip downward and stain the deflection electrode and charging electrode placed in front of the nozzle, causing problems with charging and deflection. Not only that, but the ink is conductive and there are electrodes that are subject to high voltage, which can cause damage to the device. Further, if the area around the nozzle becomes dirty due to ink dripping, the direction of the ink jet will be distorted, causing a problem that normal printing cannot be performed. Therefore, when the solenoid valve in the ink supply path is closed, the liquid chamber of the ink jet head is set to instantaneously become negative pressure so that ink jetting stops instantaneously.
ところが、液室内を負圧にすると、ノズル付近のインク
を液室内へ引き込むと同時に、ノズルを通して空気も引
き込むととになり、気泡となって液室内に残る。そこで
、次にインクの噴射動作が開始されたとき、この気泡が
短時間のうちに吐き出されずに残っていると、適化のた
めに与える振動の伝達効率が低下し、この振動伝達効率
が低下するとジェット流先端の切断点が所定の位置から
ずれてしまい、荷電効率が変動する。その結果、荷電量
の偏向量が変って印字が乱れるという現象が起こる。以
上のことから、インク滴の噴射動作を停止したとき、液
室内に空気を引き込まないように、また、吸入した気泡
は、噴射開始時に速やかに吐き出すようにすることが極
めて重要である。However, when the inside of the liquid chamber is made to have a negative pressure, the ink near the nozzle is drawn into the liquid chamber, and at the same time, air is also drawn through the nozzle, forming bubbles and remaining in the liquid chamber. Therefore, when the next ink jetting operation starts, if these bubbles remain without being expelled within a short time, the vibration transmission efficiency applied for optimization will decrease, and this vibration transmission efficiency will decrease. Then, the cutting point at the front end of the jet flow shifts from a predetermined position, and the charging efficiency fluctuates. As a result, a phenomenon occurs in which the amount of deflection of the charge changes and the printing becomes disordered. From the above, it is extremely important not to draw air into the liquid chamber when the ink droplet ejection operation is stopped, and to expel the inhaled air bubbles promptly when ejection starts.
そこで本発明は、液室とノズルとを結ぶ通路に空気の引
込を阻止する部材を設け、その部材で止まった気泡は、
噴射開始時に直ちに吐き出すようにして、待時間なしで
正常な印写を可能にするインクジェットヘッドを提供す
るものである。以下、図面により実施例を詳細に説明す
る。Therefore, in the present invention, a member is provided in the passage connecting the liquid chamber and the nozzle to prevent air from being drawn in, and air bubbles stopped by the member are
To provide an inkjet head which enables normal printing without waiting time by discharging immediately at the start of jetting. Hereinafter, embodiments will be described in detail with reference to the drawings.
第１図は、本発明の一実施例を示したもので、１はイン
クジェットヘッドであり、インク導入口２を有する液室
３、液室３に連通しインクを噴射するノズル４を形設し
たノズル体５、電源６に接続され、振動板７に貼着され
た超音波振動子８等を備えている。９はインク滴を選択
的に荷電する荷電電極、１０は荷電したインク滴を偏向
する偏向電極、１１は記録紙、１２は非荷電インク滴を
捕集するガター、１３はインクタンク、１４はポンプ、
１５はフィルタ、１６はインクジェットへラドｌへのイ
ンクの供給をオン、オフする三方電磁弁である。FIG. 1 shows an embodiment of the present invention, in which 1 is an inkjet head, in which a liquid chamber 3 having an ink introduction port 2 and a nozzle 4 communicating with the liquid chamber 3 and ejecting ink are formed. It includes a nozzle body 5, an ultrasonic vibrator 8 connected to a power source 6, and attached to a diaphragm 7, and the like. 9 is a charging electrode that selectively charges ink droplets, 10 is a deflection electrode that deflects charged ink droplets, 11 is recording paper, 12 is a gutter that collects uncharged ink droplets, 13 is an ink tank, and 14 is a pump ,
15 is a filter, and 16 is a three-way solenoid valve that turns on and off the supply of ink to the inkjet rad l.
第２図は、ノズル付近の詳細を示したもので、液室３と
ノズル４と結ぶ通路にメツシュフィルタ１８ヲ設けてい
る。このメツシュフィルタ１８は、その円周取付部をポ
リプロピレン等のバッキング１９ａ、 １９ｂによって
挾んだ状態で、ヘッド本体に設けた凹部に入れられ、ニ
ッケル等からなるノズル体５を圧入することで固定され
ている。FIG. 2 shows details of the vicinity of the nozzle, and a mesh filter 18 is provided in the passage connecting the liquid chamber 3 and the nozzle 4. This mesh filter 18 is inserted into a recess provided in the head body with its circumferential mounting portion sandwiched between backings 19a and 19b made of polypropylene or the like, and fixed by press-fitting the nozzle body 5 made of nickel or the like. has been done.
次に、本実施例の動作を説明する。まず、三方電磁弁１
６の■−■間を導通させ、ポンプ１４によりインクタン
ク１３中のインクをヘッドｌの液室３に加圧供給すると
、インクはノズル４から噴射される。このとき、超音波
振動子８により振動を与えると、その振動に同期して、
噴射されたインク流の先端が連続的忙切断され、インク
滴となる。Next, the operation of this embodiment will be explained. First, three-way solenoid valve 1
When the ink in the ink tank 13 is supplied under pressure to the liquid chamber 3 of the head 1 by the pump 14, the ink is ejected from the nozzle 4. At this time, when vibration is applied by the ultrasonic vibrator 8, in synchronization with the vibration,
The leading edge of the ejected ink stream is continuously cut off into ink droplets.
インク滴は、６荷電電極９により、画情報忙応じて選択
的に荷電され、荷電されたインク滴はその荷電量に応じ
て偏向電極１０により偏向され、記録紙１１に印写され
る。一方、荷電されなかったインク滴は直進してガター
１２に拾集され、インクタンク１３に回収されて再使用
に供せられる。次に、インクの噴射動作を停止するとき
は、三方電磁弁１６を閉じると、ポンプ側の■が速断さ
れ、■−■が導通ずる。■はインクタンク１３に導びが
れているが、大気圧に解放されているので、いままで加
圧されていた液室３内が急激に大気圧に解放され、その
ためインクが逆流して液室３内が一時的に負圧になる。The ink droplets are selectively charged by the six charging electrodes 9 according to the amount of image information, and the charged ink droplets are deflected by the deflection electrode 10 according to the amount of charge and are printed on the recording paper 11. On the other hand, uncharged ink droplets travel straight and are collected by the gutter 12, and then collected by the ink tank 13 for reuse. Next, when the ink jetting operation is to be stopped, the three-way solenoid valve 16 is closed, and the valve (2) on the pump side is quickly disconnected, and the lines (2) and (2) are brought into conduction. ■ is led to the ink tank 13, but since it is released to atmospheric pressure, the inside of the liquid chamber 3, which had been pressurized, is suddenly released to atmospheric pressure, and as a result, the ink flows backwards and becomes liquid. The inside of the chamber 3 temporarily becomes negative pressure.
このとき゛、ノズル４付近のインクを液室側に引き込む
と同時にノズル４を通して空気をも引き込もうとする。At this time, the ink near the nozzle 4 is drawn into the liquid chamber, and at the same time air is also drawn through the nozzle 4.
しかし、本実施例のようにノズル４と液室３との間にメ
ツシュフィルタ１８を設けておき、このフィルタ１８の
メツシュ数を十分大きく、即ち網の目の大きさを十分小
さく（例えば数μｍ）すること如より通気抵抗が大きく
なり、このため、超音波振動子８による励振効率は若干
低下するが、液室３への空気の引き込みに阻止すること
ができる。また、インクの噴射動作を再開したときは、
ノズル４とフィルタ１８とのわずかな間隙部に残った気
泡が直ちに吐き出されるので、待ち時間なしで、安定し
た励振効率による正常な印写を開始することができる。However, as in this embodiment, a mesh filter 18 is provided between the nozzle 4 and the liquid chamber 3, and the mesh number of this filter 18 is made sufficiently large, that is, the mesh size is made sufficiently small (for example, several meshes). .mu.m), the ventilation resistance increases, and as a result, the excitation efficiency by the ultrasonic vibrator 8 is slightly lowered, but air can be prevented from being drawn into the liquid chamber 3. Also, when the ink jetting operation is restarted,
Since the air bubbles remaining in the small gap between the nozzle 4 and the filter 18 are immediately discharged, normal printing with stable excitation efficiency can be started without waiting time.
第３図は、本発明の他の実施例を示したもので、第１図
と同一符号のものは同一のものを示し１おり、また、２
０は、ゴムの弁座２１とステンレス薄板をエツチング等
により加工した弁体２２とからなる逆止弁で、ノズル４
と液室３とを結ぶ通路に設けられている。弁体２２は、
第４図に示したように、中央部に弁座２１の弁穴を塞ぐ
弁板部２２ａを有し、この弁板部２２ｍを周囲固定部か
ら延びた細幅の連結部２２ｂで保持している。いま、イ
ンクの噴射動作を行なっているときは、第５１囚のよう
に、インク圧により弁板部２２ａが持ち上げられ、弁穴
が開いてインクが矢印のようにノズル側へ流れ出る。FIG. 3 shows another embodiment of the present invention, in which the same reference numerals as in FIG.
0 is a check valve consisting of a rubber valve seat 21 and a valve body 22 made of a thin stainless steel plate by etching or the like.
and the liquid chamber 3. The valve body 22 is
As shown in FIG. 4, there is a valve plate part 22a in the center that closes the valve hole of the valve seat 21, and this valve plate part 22m is held by a narrow connecting part 22b extending from a peripheral fixing part. There is. Now, when ink is being ejected, the valve plate portion 22a is lifted by the ink pressure, the valve hole is opened, and ink flows out to the nozzle side as shown by the arrow, as shown in the 51st case.
次に、インクの噴射動作を停止したときは、液室側が負
圧になるので、第５図（Ｂ）に示したように、弁穴は弁
板部２２ａによって閉塞され、従って、このときノズル
を通して空気が入ったとしても弁穴を通って液室内に入
ることはなく、第１図の実施例と同様の効果を有する。Next, when the ink jetting operation is stopped, the pressure in the liquid chamber becomes negative, so the valve hole is closed by the valve plate part 22a, as shown in FIG. Even if air enters through the valve hole, it will not enter the liquid chamber through the valve hole, and the same effect as in the embodiment shown in FIG. 1 is obtained.
以上説明したように、本発明によれば、液室への空気引
込を阻止することができ、従って、インクの噴射動作を
開閉する時には直ちに印写動作に移ることができるとと
もに、常に正常な印写が維持され、印写品質を向上する
ことができる利点がある。As explained above, according to the present invention, it is possible to prevent air from being drawn into the liquid chamber, and therefore, when the ink jetting operation is opened or closed, the printing operation can be immediately started, and the printing operation is always normal. This has the advantage that the image can be maintained and the quality of printing can be improved.
第１図は、本発明の一実施例の構成図、第２図は、同実
施例の要部の詳細断面図、第３図は、本発明の他の実施
例の構成図、第４図は、同実施例の弁体を示す図、第５
図は、動作説明図である。
３・・・・・・・・・液室、 ４ ・・・・・・・・・
ノズル、 ５・・・・・・・・・ノズル体、 ８・・・
・・・・・・超音波振動子、 ９・・・・・・・・・荷
電電極、 １０・・・・・・・・・偏向電極、 １３・
・・・・・・・・インクタンク：１４・・・・・・・・
・ポンプ、 １６・・・・・・・・・三方電磁弁、１８
・・・・・・・・・メツシュフィルタ、 ２０・・・・
・・・・・逆止弁、 ２１・・・・・１・・・弁座、
２２・・・・・・・・・弁体、２２ａ・・・・・・・・
・弁板部。
第３図
第４図
第５図
（Ａ） （Ｂ）FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a detailed sectional view of the main parts of the same embodiment, FIG. 3 is a block diagram of another embodiment of the present invention, and FIG. 4 is a block diagram of another embodiment of the present invention. Figure 5 shows the valve body of the same example.
The figure is an explanatory diagram of the operation. ３・・・・・・・・・Liquid chamber, ４・・・・・・・・・
Nozzle, 5...Nozzle body, 8...
...... Ultrasonic transducer, 9...... Charged electrode, 10... Deflection electrode, 13.
・・・・・・・・・Ink tank: 14・・・・・・・・・
・Pump, 16... Three-way solenoid valve, 18
......Mesh filter, 20...
...Check valve, 21...1...Valve seat,
22... Valve body, 22a...
・Valve plate part. Figure 3 Figure 4 Figure 5 (A) (B)
Claims (2)
液室にインクを加圧供給し、前記液室に連通ずルノスル
からインク滴を噴射して、そのインク滴を選択的に荷電
、偏向する荷電偏向型インクジェットヘッドにおいて、
前記液室とノズルとを結ぶ通路に、インク滴の噴射動作
を停止したとき液室内が負圧になることによりノズルか
ら吸込む空気が前記液室内へ引き込まれることを阻止す
る部材を設けたことを特徴とするインクジェットヘッド
。(1) A charge deflection type in which ink is supplied under pressure to the liquid chamber of an inkjet head from an ink supply system, ink droplets are ejected from a lubricant without communicating with the liquid chamber, and the ink droplets are selectively charged and deflected. In the inkjet head,
A member is provided in the passage connecting the liquid chamber and the nozzle to prevent air sucked from the nozzle from being drawn into the liquid chamber due to negative pressure in the liquid chamber when the ink droplet ejection operation is stopped. Features an inkjet head.
からなることを特徴とする特許請求の範囲第（１）項記
載のインクジェットヘッド。 −（３） 前
記空気の引込を阻止“する部材は、逆止弁からなること
を特徴とする特許請求の範囲第（１）項記載のインクジ
ェットヘッド。(2) The inkjet head according to claim (1), wherein the member that prevents air from being drawn in includes a filter. (3) The inkjet head according to claim (1), wherein the member for preventing air from being drawn in comprises a check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20955981A JPS58112748A (en) | 1981-12-26 | 1981-12-26 | Ink jet head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20955981A JPS58112748A (en) | 1981-12-26 | 1981-12-26 | Ink jet head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58112748A true JPS58112748A (en) | 1983-07-05 |
Family
ID=16574824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20955981A Pending JPS58112748A (en) | 1981-12-26 | 1981-12-26 | Ink jet head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58112748A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60206653A (en) * | 1984-03-31 | 1985-10-18 | Canon Inc | Liquid jet recording apparatus |
| JPS60262653A (en) * | 1984-06-12 | 1985-12-26 | Seiko Epson Corp | Ink jet recorder |
| US5426459A (en) * | 1992-12-22 | 1995-06-20 | Hewlett-Packard Company | Combined filter/aircheck valve for thermal ink-jet pen |
| US5650812A (en) * | 1992-06-09 | 1997-07-22 | Sharp Kabushiki Kaisha | Recording head for preventive air intrusion into the common chamber |
| JP2010023381A (en) * | 2008-07-23 | 2010-02-04 | Hitachi Industrial Equipment Systems Co Ltd | Inkjet recorder |
-
1981
- 1981-12-26 JP JP20955981A patent/JPS58112748A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60206653A (en) * | 1984-03-31 | 1985-10-18 | Canon Inc | Liquid jet recording apparatus |
| JPS60262653A (en) * | 1984-06-12 | 1985-12-26 | Seiko Epson Corp | Ink jet recorder |
| US5650812A (en) * | 1992-06-09 | 1997-07-22 | Sharp Kabushiki Kaisha | Recording head for preventive air intrusion into the common chamber |
| US5426459A (en) * | 1992-12-22 | 1995-06-20 | Hewlett-Packard Company | Combined filter/aircheck valve for thermal ink-jet pen |
| JP2010023381A (en) * | 2008-07-23 | 2010-02-04 | Hitachi Industrial Equipment Systems Co Ltd | Inkjet recorder |
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