JPH044152B2 - - Google Patents
Info
- Publication number
- JPH044152B2 JPH044152B2 JP13304282A JP13304282A JPH044152B2 JP H044152 B2 JPH044152 B2 JP H044152B2 JP 13304282 A JP13304282 A JP 13304282A JP 13304282 A JP13304282 A JP 13304282A JP H044152 B2 JPH044152 B2 JP H044152B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- ink
- pressure
- air flow
- orifice
- 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.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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
- B41J2/175—Ink supply systems ; Circuit parts therefor
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Description
【発明の詳細な説明】
(イ) 技術分野
本発明は微小インク滴により文字・記号・図形
等の画像を印写するインクジツトプリンタに関す
る。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to an inkjet printer that prints images such as characters, symbols, figures, etc. using minute ink droplets.
(ロ) 背景技術
微小なインク滴を噴射するインク滴噴射装置に
於ける最大の欠点は上記インク滴が噴射せしめら
れるオリフイスの目詰まりにあることは広く知ら
れている。特にオリフイス近傍のインクに微小な
圧力変化を加えることによつてインク滴を噴射せ
しめるオンデマンド型のインク滴噴射装置にあつ
ては、インク滴の噴射が上述の如く微小な加圧力
によるために上記目詰まりが発生すると、該目詰
まりを容易に自己復帰することはできず、従つて
非印写動作時の目詰まりを予め防止せざるを得な
い。(B) Background Art It is widely known that the biggest drawback of ink drop ejecting devices that eject minute ink droplets is that the orifice through which the ink droplets are ejected is clogged. Particularly in the case of on-demand type ink droplet ejecting devices that eject ink droplets by applying minute pressure changes to the ink near the orifice, the ejection of ink droplets is caused by the minute pressurizing force as described above. Once clogging occurs, the clogging cannot be easily recovered by itself, and therefore, it is necessary to prevent clogging in advance during non-printing operations.
一方、インク滴の噴射動作を補助することを目
的として、インク滴が噴射せしめられる第１のオ
リフイスの軸線方向に空気層を挾んで第２のオリ
フイスを設け、上記空気層の外周から加圧空気流
を付加せしめたインク滴噴射装置が特開昭51−
109738号公報に開示されている。 On the other hand, for the purpose of assisting the ejection operation of ink droplets, a second orifice is provided in between an air layer in the axial direction of the first orifice through which ink droplets are ejected, and pressurized air is supplied from the outer periphery of the air layer. An ink droplet ejecting device that added a flow was published in 1973.
It is disclosed in Publication No. 109738.
本願出願人は斯る特開昭51−109738号公報に開
示された如き第１のオリフイスの全面に空気層を
備えたインク滴噴射装置に好適な目詰まり防止方
法を特願昭56−112727号等として出願するに及ん
でいる。第１図は上記特願昭56−112727号により
提案されたインク滴噴射装置のインク充填動作時
の状態を示し、１はオンデマンド型ダイヤフラム
方式のインク滴噴射装置で、圧電振動子２の振動
を小径のダイヤフラム３に集中的に加え、該ダイ
ヤフラム３の前面のインクを加圧して第１のオリ
フイス４からインク滴を噴射せしめる。そして、
このインク滴は空気層５の外周方向から付加され
た空気流に包まれるようにして第１のオリフイス
４の軸線上に設けられた第２のオリフイス６から
吐出される。尚、以上の説明は印写動作時のもの
であり第１図の非印写動作時の状態との間の於い
て差違が存在する。即ち、非印写動作時の於いて
第２のオリフイス６は蓋体７によつて覆蓋され空
気層５に第１のオリフイス４からインクが供給せ
しめられて上記第１のオリフイス４は該インクに
よつて被覆状態にある。従つて、空気層５に充填
されたインクによつて第１のオリフイス４に於け
る乾燥並びに塵埃の付着を主因とする目詰まりが
防止される。 The applicant of the present application has disclosed in Japanese Patent Application No. 56-112727 a clogging prevention method suitable for an ink droplet ejecting device having an air layer over the entire surface of the first orifice as disclosed in Japanese Patent Application Laid-Open No. 51-109738. The application has even been filed as such. FIG. 1 shows the state of the ink droplet ejecting device proposed in the above-mentioned Japanese Patent Application No. 112727/1983 during ink filling operation. is concentratedly applied to the small-diameter diaphragm 3 to pressurize the ink in front of the diaphragm 3 and eject ink droplets from the first orifice 4. and,
The ink droplets are ejected from the second orifice 6 provided on the axis of the first orifice 4 while being surrounded by an air flow applied from the outer circumferential direction of the air layer 5 . Note that the above explanation is for the printing operation, and there are differences between the state and the non-printing operation shown in FIG. That is, during non-printing operation, the second orifice 6 is covered by the lid 7, and ink is supplied from the first orifice 4 to the air layer 5, and the first orifice 4 is supplied with the ink. Therefore, it is in a covered state. Therefore, the ink filled in the air layer 5 prevents the first orifice 4 from drying out and clogging mainly due to adhesion of dust.
第１図に於て、８はインク溜りを構成する交換
自在のインクカートリツジ、９は該カートリツジ
８並びにインク滴噴射装置１の空気層５に空気流
を付加するエアポンプ、１０は該エアポンプ９の
空気層５に至る流路に配設された三方電磁弁で、
非印写動作時のインク充填中は図示の如く空気層
５を外部に開放しエアポンプ９の送気端を閉じ、
インク充填終了後180°回転して外部に開放してい
た空気層５を閉じて充填されたインクをトリチエ
ツリ（Torricelli）の原理によつて保持すると共
に、印写動作時はエアポンプ１０と空気層５とを
連通せしめる。 In FIG. 1, 8 is a replaceable ink cartridge forming an ink reservoir, 9 is an air pump that adds air flow to the cartridge 8 and the air layer 5 of the ink droplet ejecting device 1, and 10 is the air pump 9. A three-way solenoid valve installed in the flow path leading to the air layer 5.
During ink filling during non-printing operation, the air layer 5 is opened to the outside as shown in the figure, and the air supply end of the air pump 9 is closed.
After filling the ink, it is rotated 180 degrees to close the air layer 5 that was open to the outside and retain the filled ink using the Torricelli principle. During printing, the air pump 10 and the air layer 5 are communicate with.
斯る構造のインク滴噴射装置１は印写動作時上
述の如く空気層５の付加される空気流によつてイ
ンク滴の飛翔が補助せしめられるために、付加さ
れる空気流は均圧なものでなければならない。即
ち、空気流の空気圧が変動すると、インク滴の飛
翔状態が乱れ、印写画像の品質を劣化せしめるこ
とになる。 In the ink droplet ejecting device 1 having such a structure, during the printing operation, the flight of the ink droplets is assisted by the airflow added by the air layer 5 as described above, so that the added airflow is of equal pressure. Must. That is, if the air pressure of the air flow fluctuates, the flying state of ink droplets will be disturbed, resulting in deterioration of the quality of the printed image.
ところがエアポンプ９から発せられる空気流は
駆動部の摩耗等により減圧変動するために、従来
から第１図には図示していない第２図に示す如き
圧力調整器１１がエアポンプ９の直後に設けられ
ている。斯る圧力調整器１１は空気流を大気にリ
ークせしめると共に、そリーク量を図示していな
い圧力センサの出力に応じて可変せしめることに
より空気層５並びにインクカートリツジ８に供給
される空気流を一定値に制御する。このために従
来から空気層５並びにインクカートリツジ８に供
給される空気流の空気圧はエアポンプ９の元圧よ
り強制的に、例えば元圧0.3〜0.5Kg／cm2が0.1Kg／
cm2程度の1/3〜1/5に減圧されていた。 However, since the air flow emitted from the air pump 9 changes in pressure due to wear of the drive unit, etc., a pressure regulator 11 as shown in FIG. 2, which is not shown in FIG. 1, has conventionally been provided immediately after the air pump 9. ing. The pressure regulator 11 not only allows the air flow to leak to the atmosphere, but also controls the air flow supplied to the air layer 5 and the ink cartridge 8 by varying the amount of leakage depending on the output of a pressure sensor (not shown). Control to a constant value. For this reason, the air pressure of the air flow supplied to the air layer 5 and the ink cartridge 8 has conventionally been forced to be lower than the original pressure of the air pump 9, for example, when the original pressure is 0.3 to 0.5 kg/cm 2 to 0.1 kg/cm 2 .
The pressure was reduced to 1/3 to 1/5 of cm2 .
一方、インクの粘度は周知の如く温度の影響を
著しく受け温度の低下に伴なう粘度の上昇によ
り、非印写動作時第１のオリフイス４を介して行
なわれる空気層５へのインク充填時間が増大す
る。従つて、より小径なインク滴の噴射を得、高
解像度の画像印写を得るべく粘度の高いインクを
使用した場合、上記インク充填時間の増大は免れ
ない。 On the other hand, as is well known, the viscosity of ink is significantly affected by temperature, and the viscosity increases as the temperature decreases. increases. Therefore, when ink with high viscosity is used in order to eject smaller diameter ink droplets and print images with high resolution, the ink filling time is inevitably increased.
(ハ) 発明の開示
本発明は斯る点に鑑みて為されたものであつ
て、空気層を挾んで互いに対向した第１・第２の
オリフイスを有するインク滴噴射装置と、空気流
を発生する空気流発生手段と、該空気流発生手段
から発生される空気流を所定値に減圧する圧力調
整器と、上記第１のオリフイスと連通するインク
溜りと、上記空気流発生手段と上記空気層とを連
結する第１の空気供給系と、上記空気流発生手段
と上記インク溜りとを連結する第２の空気供給系
とを備え、印写動作時、上記圧力調整器により所
定値に減圧された空気流を上記第１の空気供給系
を通して上記空気層に供給し、上記第１のオリフ
イスから吐出したインク滴の飛翔を補助せしめる
と共に、非印写動作時、上記第２のオリフイスを
閉塞しかつ上記空気流発生手段と上記圧力調整器
とを遮断することにより、印写動作時に上記空気
層に供給される空気流より高圧の空気流を上記第
２の空気供給系を通して上記インク溜りに加え、
該インク溜りのインク圧を空気層の空気圧より上
昇せしめて上記第１のオリフイスからインクを流
出せしめ、上記空気層にインクを充填するもので
ある。(c) Disclosure of the Invention The present invention has been made in view of the above points, and includes an ink droplet ejecting device having first and second orifices facing each other with an air layer in between, and an ink droplet ejecting device that generates an air flow. a pressure regulator that reduces the pressure of the air flow generated from the air flow generation means to a predetermined value; an ink reservoir communicating with the first orifice; the air flow generation means and the air layer. and a second air supply system that connects the air flow generating means and the ink reservoir, and the pressure is reduced to a predetermined value by the pressure regulator during printing operation. The air flow is supplied to the air layer through the first air supply system to assist the flight of the ink droplets discharged from the first orifice, and to close the second orifice during non-printing operation. and by blocking the air flow generating means and the pressure regulator, an air flow having a higher pressure than the air flow supplied to the air layer during the printing operation is added to the ink reservoir through the second air supply system. ,
The ink pressure in the ink reservoir is made higher than the air pressure in the air layer to cause ink to flow out from the first orifice, thereby filling the air layer with ink.
(ニ) 発明を実施するための最良の形態
第３図は本発明インクジエツトプリンタの非印
写動作時に於けるインク充填を示す模式図で、第
１図及び第２図と同じものについては同番号を付
し、１はオンデマンド型ダイヤフラム方式のイン
ク滴噴射装置、７は蓋体、８はインク溜りを構成
するインクカートリツジ、９はエアポンプ、１１
は圧力調整器で、異なるところは上記圧力調整器
１１の配置状態にある。即ち、圧力調整器１１は
エアポンプ９からインク滴噴射装置１の空気層５
に至る第１の空気供給系１２ａに配挿され、その
前後の空気供給系１２ａには第１・第２の電磁弁
１３ａ，１３ｂが設けられている。(d) Best Mode for Carrying Out the Invention Fig. 3 is a schematic diagram showing ink filling during non-printing operation of the inkjet printer of the present invention, and the same parts as Figs. 1 and 2 are the same. Numbered, 1 is an on-demand diaphragm type ink droplet ejecting device, 7 is a lid, 8 is an ink cartridge forming an ink reservoir, 9 is an air pump, 11
is a pressure regulator, and the difference lies in the arrangement of the pressure regulator 11. That is, the pressure regulator 11 connects the air pump 9 to the air layer 5 of the ink droplet ejecting device 1.
The air supply system 12a is installed in the first air supply system 12a leading to the first air supply system 12a, and the first and second electromagnetic valves 13a and 13b are provided in the air supply system 12a before and after the first air supply system 12a.
斯る構成のインクジエツトプリンタに於ける空
気層５へのインク充填動作は、エアポンプ９側の
第１の電磁弁１３ａが閉じられ空気層５側の第２
の電磁弁１３ｂが開かれた状態で行なわれる。即
ち、第１の電磁弁１３ａが閉じられることによつ
てエアポンプ９と圧力調整器１１との連通は遮断
される。この状態でエアポンプ９を稼動すると、
発生した空気流は圧力調整器１１による減圧力調
整作用を受けることなく元圧のまま第２の空気供
給系１２ｂを介してインクカートリツジ８に供給
される。従つて、インクカートリツジ８には従来
のインク充填時に較べ３〜５倍程度高圧の空気流
が供給されることになり、該インクカートリツジ
８内のインクを介してインク滴噴射装置１内のイ
ンクを加圧する。その結果、空気流が付加されて
いない空気層５の空気圧に較べインク滴噴射装置
１内のインク圧は急激に圧力上昇して第１のオリ
フイス４から平衡状態にあつたインクが流出し、
第１の空気供給系１２ａのインク滴噴射装置１近
傍に設けられた検出器１４で検出されるまで空気
層５へのインク充填は継続される。 In an inkjet printer having such a configuration, the operation of filling ink into the air layer 5 is performed by closing the first electromagnetic valve 13a on the air pump 9 side and closing the second electromagnetic valve 13a on the air layer 5 side.
This is done with the solenoid valve 13b open. That is, by closing the first solenoid valve 13a, communication between the air pump 9 and the pressure regulator 11 is cut off. If you operate the air pump 9 in this state,
The generated air flow is supplied to the ink cartridge 8 via the second air supply system 12b at the original pressure without being subjected to the pressure reduction adjustment effect by the pressure regulator 11. Therefore, the ink cartridge 8 is supplied with an air flow that is about 3 to 5 times higher pressure than when filling with ink in the past, and the air flow in the ink droplet ejecting device 1 is caused to flow through the ink in the ink cartridge 8. Pressurize the ink. As a result, the ink pressure within the ink droplet ejecting device 1 rises rapidly compared to the air pressure in the air layer 5 to which no air flow is applied, and the ink that was in an equilibrium state flows out from the first orifice 4.
The filling of ink into the air layer 5 continues until detection is made by the detector 14 provided near the ink droplet ejecting device 1 of the first air supply system 12a.
尚、空気層５内の空気は第１の空気供給系１２
ａを流れ開状態にある第２の電磁弁１３ｂ及び圧
力調整器１１を介して外部に放出される。 Note that the air in the air layer 5 is supplied to the first air supply system 12.
a, and is discharged to the outside via the second electromagnetic valve 13b and the pressure regulator 11, which are in the open state.
そして、インク充填が上述の如く検出器１４に
より検出されると、第４図に示すように第２の電
磁弁１３ｂを閉じると共にエアポンプ９の稼動を
停止する。 Then, when the ink filling is detected by the detector 14 as described above, the second solenoid valve 13b is closed and the operation of the air pump 9 is stopped as shown in FIG.
第５図は印写動作時を示す模式図で、第１の空
気供給系１２ａに配挿された第１・第２の電磁弁
１３ａ，１３ｂは両者とも開状態にあり、エアポ
ンプ９と圧力調整器１１及び空気層５とは連通す
る。この状態でエアポンプ９を稼動せしめると、
発生した空気流は圧力調整器１１の所定の減圧力
調整作用を受け、該空気流は元圧の1/3〜1/5程度
の低圧ながらも均一な流れに調整される。従つ
て、印写動作時にエアポンプ９からインクカート
リツジ８及びインク滴噴射装置１の空気層５に供
給される空気流は圧力調整された均圧な流れとな
り、インク滴１５の飛翔状態に何ら悪影響を与え
ることはない。 FIG. 5 is a schematic diagram showing the printing operation, in which the first and second solenoid valves 13a and 13b arranged in the first air supply system 12a are both in an open state, and the air pump 9 and pressure adjustment The container 11 and the air layer 5 communicate with each other. When the air pump 9 is operated in this state,
The generated air flow is subjected to a predetermined pressure reduction adjustment action of the pressure regulator 11, and the air flow is adjusted to be a uniform flow even though it is at a low pressure of about 1/3 to 1/5 of the original pressure. Therefore, during the printing operation, the air flow supplied from the air pump 9 to the ink cartridge 8 and the air layer 5 of the ink droplet ejecting device 1 becomes a pressure-adjusted, even pressure flow, and does not have any adverse effect on the flying state of the ink droplets 15. will not be given.
(ホ) 効果及び産業上の利用可能性
本発明は以上の説明から明らかな如く、非印写
動作時第１のオリフイスとインクを介して連通す
るインク溜りに、印写動作時に空気層に供給され
る空気流より高圧の空気流を加えるので、従来に
較べ第１のオリフイスから流出するインクの流出
速度が上昇しインクの充填時間を短縮することが
できる。その結果本発明によれば粘度の高いイン
クを使用してもインク充填時間を些程必要とせ
ず、斯る高粘度のインクの使用により高解像度の
画像印写を得ることが可能となる。(e) Effects and industrial applicability As is clear from the above description, the present invention provides an ink reservoir that communicates with the first orifice via ink during non-printing operations, and an air layer during printing operations. Since an air flow having a higher pressure than the air flow is applied, the outflow speed of the ink flowing out from the first orifice is increased compared to the conventional method, and the ink filling time can be shortened. As a result, according to the present invention, even if high viscosity ink is used, ink filling time is not required, and high-resolution image printing can be obtained by using such high viscosity ink.
第１図は従来例を示す模式的の断面図、第２図
は従来例の要部を示す模式図、第３図乃至第５図
は本発明インクジエツトプリンタを状態別に示し
た模式図である。
１……インク滴噴射装置、４……第１のオリフ
イス、５……空気層、６……第２のオリフイス、
８……インクカートリツジ、９……エアポンプ、
１１……圧力調整器、１３ａ，１３ｂ……第１・
第２の電磁弁。
FIG. 1 is a schematic sectional view showing a conventional example, FIG. 2 is a schematic diagram showing main parts of the conventional example, and FIGS. 3 to 5 are schematic views showing the inkjet printer of the present invention according to its state. . DESCRIPTION OF SYMBOLS 1... Ink droplet ejecting device, 4... First orifice, 5... Air layer, 6... Second orifice,
8...Ink cartridge, 9...Air pump,
11...Pressure regulator, 13a, 13b...1st.
Second solenoid valve.
Claims (1)
オリフイスを有するインク滴噴射装置と、空気流
を発生する空気流発生手段と、該空気流発生手段
から発生される空気流を所定値に減圧する圧力調
整器と、上記第１のオリフイスと連通するインク
溜りと、上記空気流発生手段と上記空気層とを連
結する第１の空気供給系と、上記空気流発生手段
と上記インク溜りとを連結する第２の空気供給系
とを備え、印写動作時、上記圧力調整器により所
定値に減圧された空気流を上記第１の空気供給系
を通して上記空気層に供給し、上記第１のオリフ
イスから吐出したインク滴の飛翔を補助せしめる
と共に、非印写動作時、上記第２のオリフイスを
閉塞しかつ上記空気流発生手段と上記圧力調整器
とを遮断することにより、印写動作時に上記空気
層に供給される空気流より高圧の空気流を上記第
２の空気供給系を通して上記インク溜りに加え、
該インク溜りのインク圧を空気層の空気圧より上
昇せしめて上記第１のオリフイスからインクを流
出せしめ、上記空気層にインクを充填することを
特徴としたインクジエツトプリンタ。1. An ink droplet ejecting device having first and second orifices facing each other with an air layer in between, an air flow generating means for generating an air flow, and an air flow generated from the air flow generating means to a predetermined value. a pressure regulator for reducing the pressure; an ink reservoir communicating with the first orifice; a first air supply system connecting the air flow generating means and the air layer; and the air flow generating means and the ink reservoir. and a second air supply system that connects the first and second air supply systems, and during printing operation, supplies an air flow whose pressure is reduced to a predetermined value by the pressure regulator to the air layer through the first air supply system, and In addition to assisting the flight of ink droplets discharged from the orifice, during non-printing operations, the second orifice is closed and the air flow generating means and the pressure regulator are shut off, thereby reducing the pressure during printing operations. applying an air flow at a higher pressure than the air flow supplied to the air layer to the ink reservoir through the second air supply system;
An inkjet printer characterized in that the ink pressure in the ink reservoir is made higher than the air pressure in the air layer to cause the ink to flow out from the first orifice, thereby filling the air layer with ink.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13304282A JPS5922761A (en) | 1982-07-29 | 1982-07-29 | Ink jet printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13304282A JPS5922761A (en) | 1982-07-29 | 1982-07-29 | Ink jet printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5922761A JPS5922761A (en) | 1984-02-06 |
| JPH044152B2 true JPH044152B2 (en) | 1992-01-27 |
Family
ID=15095449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13304282A Granted JPS5922761A (en) | 1982-07-29 | 1982-07-29 | Ink jet printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5922761A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4598303A (en) * | 1984-11-28 | 1986-07-01 | Tektronix, Inc. | Method and apparatus for operating an ink jet head of an ink jet printer |
| NL1021319C2 (en) * | 2002-08-22 | 2004-02-24 | Tno | Device and method for printing a viscous substance. |
-
1982
- 1982-07-29 JP JP13304282A patent/JPS5922761A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5922761A (en) | 1984-02-06 |
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