JPS61215059A - Ink jet recording apparatus - Google Patents

Ink jet recording apparatus

Info

Publication number
JPS61215059A
JPS61215059A JP5600785A JP5600785A JPS61215059A JP S61215059 A JPS61215059 A JP S61215059A JP 5600785 A JP5600785 A JP 5600785A JP 5600785 A JP5600785 A JP 5600785A JP S61215059 A JPS61215059 A JP S61215059A
Authority
JP
Japan
Prior art keywords
ink
nozzle
pressure
pressure generator
clogging
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
JP5600785A
Other languages
Japanese (ja)
Inventor
Yasuo Hosaka
保坂 靖夫
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP5600785A priority Critical patent/JPS61215059A/en
Publication of JPS61215059A publication Critical patent/JPS61215059A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/165Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517Cleaning of print head nozzles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2002/1437Back shooter
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01Embodiments of or processes related to ink-jet heads
    • B41J2202/15Moving nozzle or nozzle plate

Abstract

PURPOSE:To automatically remove the clogging of an ink nozzle, by providing the ink nozzle in a pressure generator consisting of a piezoelectric element and a vibration plate. CONSTITUTION:When the ink emitting nozzle 11 provided in a pressure generator 10 is clogged with coagulated ink or dust, said pressure generator 10 is subjected to forcible vibration 9 and coagulated ink or dust 7 is forcibly destructed or released from the nozzle 11 by the pressure 8 generated in an ink chamber 5 and the mechanical minute deformation of the nozzle part by the deformation of the pressure generator 10 to be emitted to the outside of the ink chamber 5 along with ink. With respect to stronger clogging, the pressure generator is vibrated more forcibly at the mechanical resonance point of the pressure generator 10 and the ink chamber 5 and the max. nozzle deformation and the pressure from the ink are obtained to enable the elmination of ink clogging. Both of processes are performed prior to printing and a stable image can be always obtained in printing.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は圧力パルス式インクジェット記録装置に関す
る。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pressure pulse type inkjet recording apparatus.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

普通紙に記録可能なインクジェット記録方式には、静電
加速式、圧力パルス式、加圧振動式があり、さらに最近
ではバブルジェット式が開発されている。これらいずれ
のインクジェット記録方式も印字の速時性、装置の簡易
性、およびカラー印字の容易性と色の再現性において他
の記録技術よりも優れている。しかし、このような優位
性を有しながらもインクの目づまり等によるインク飛翔
の不安定性およびメインテナンス性の悪さにより、いず
れのインクジェット方式も製品となったものは少ない。
Inkjet recording methods that can record on plain paper include electrostatic acceleration, pressure pulse, and pressure vibration methods, and more recently, a bubble jet method has been developed. All of these inkjet recording methods are superior to other recording techniques in terms of printing speed, device simplicity, ease of color printing, and color reproducibility. However, despite these advantages, few inkjet systems have been commercialized due to instability of ink flight due to ink clogging and poor maintenance.

これらのインクジェット記録方式のうち、圧力パルス方
式が装置の簡便性等により欠点を有しながらも事務機器
用として最つともよく研究されかつ製品化がなされてい
る。
Among these inkjet recording methods, the pressure pulse method has been most well researched and commercialized for use in office equipment, although it has drawbacks such as the simplicity of the device.

つぎに従来の圧力パル式インクジェット装置の問題点を
第2図と第3図を用いて述べる。図2−(、)は圧力パ
ルス式インクジェットヘッドの一般的な断面模式図であ
る。ヘッド本体(2Dはインク流入口(23とインク室
(ハ)と圧力発生装置(至)とからなる。
Next, problems with the conventional pressure pulse type inkjet device will be described using FIGS. 2 and 3. FIG. 2-(,) is a general cross-sectional schematic diagram of a pressure pulse type inkjet head. The head body (2D) consists of an ink inlet (23), an ink chamber (c), and a pressure generator (to).

ヘッド本体C1,)にはインク吐出用ノズル−が設けら
れている。また圧力発生装置(7)は金橋板(財)と圧
電素子(ハ)とから構成されている。このヘッドによる
インク吐出までの1サイクルを第3図に示す。図3−(
a)はインクがノズル先端67)にまで達してい゛る定
常状態であり、このとき圧力発生装[CII)に信号電
圧が加えられる。この加えられた信号電圧により圧力発
生装置は図3−(b)に示すように変形(4わし。
The head main body C1,) is provided with an ink ejection nozzle. Further, the pressure generating device (7) is composed of a metal bridge board (foundation) and a piezoelectric element (c). FIG. 3 shows one cycle up to ink ejection by this head. Figure 3-(
A) is a steady state in which ink has reached the nozzle tip 67), and at this time a signal voltage is applied to the pressure generator [CII]. This applied signal voltage causes the pressure generator to deform as shown in Figure 3-(b).

インク室(5)に圧力を生ずる。その結果(36)に示
すようにインクはノズル01から吐出する。信号電圧が
オフになると図3−(c)に示すように圧力発生装置(
4邊はもとの状態に復帰し、インク粒子(36)が発生
して飛翔する。このときノズル中のインクはノズルの奥
(391に引き込まれた状態となる。ついで図3−(d
)に示すようにインクはインクとノズルの濡れ、および
インクの表面張力によりノズル先端に移動し、もとの状
態に戻る。このような従来のインクジェットヘッドにお
いて長時間の放置またはゴミにより、目づまりが発生し
た場合を図2−(b)に示す。ノズル(ハ)中には長時
間の放置によるインクの凝固0′i)により、またはイ
ンク中のゴミ等によって目づまりが生ずる。このとき、
目ずまり除去用の強制的な圧力発生装置からのインク室
に生じた圧力Q81により、目づ捷りが解消する場合も
あるが、この圧力のみでは目づまりが解消しないことが
一般的に多い。その結果印字不可能な状態となる。
Pressure is created in the ink chamber (5). As a result, ink is ejected from nozzle 01 as shown in (36). When the signal voltage is turned off, the pressure generator (
The fourth corner returns to its original state, and ink particles (36) are generated and fly. At this time, the ink in the nozzle is drawn into the back of the nozzle (391).
), the ink moves to the nozzle tip due to the wetting of the ink and the nozzle and the surface tension of the ink, and returns to its original state. FIG. 2-(b) shows a case in which clogging occurs in such a conventional inkjet head due to long-term storage or dust. Clogging occurs in the nozzle (c) due to coagulation of the ink due to long-term standing, or due to dirt in the ink. At this time,
Although the pressure Q81 generated in the ink chamber from the forced pressure generating device for clogging removal may eliminate the clogging, this pressure alone is generally not sufficient to eliminate the clogging. As a result, printing becomes impossible.

〔発明の目的〕[Purpose of the invention]

この発明は、ノズルの目づまりを自動的に除去し得るイ
ンクジェット記録装置を提供することを目的とする。
An object of the present invention is to provide an inkjet recording apparatus that can automatically remove clogging of nozzles.

〔発明の概要〕[Summary of the invention]

この発明に係るインクジェット記録装置は、圧力パルス
式インクジェットのインクノズルを圧電素子と振動板と
からなる圧力発生装置内に設け、インク吐出と同時にノ
ズルに機械的振動を与えノズルの目づまりを防止すると
同時に、インクジェット記録装置の長時間放置によるイ
ンクの目づまりが発生した場合にも、インクノズルに強
制的に機械的振動を与え、目づまりの原因である凝固し
たインクおよび汚れを破壊除去するものである。
The inkjet recording device according to the present invention includes a pressure pulse type inkjet ink nozzle in a pressure generating device consisting of a piezoelectric element and a diaphragm, and applies mechanical vibration to the nozzle at the same time as ink is ejected to prevent clogging of the nozzle. Even if ink clogging occurs due to long-term use of an inkjet recording device, mechanical vibrations are forcibly applied to the ink nozzles to destroy and remove the solidified ink and dirt that are the cause of the clogging.

〔発明の実施例〕[Embodiments of the invention]

次に図を用いて詳細に説明する。第1図−(、)は本発
明の圧カバルス式インクジェットヘッドの断面模式図で
ある。ヘッド本体(1)はインクの流入口(2)とイン
ク室(5)と圧力発生装置(1(Itとからなる。この
圧力発生装置は金属板(4)と圧電素子(3)とからな
り、この振動の最大振巾の点にインク吐出用ノズルIが
存在する。このインクジェットヘッドによるインク吐出
の模様を模式的に第4図に示す。インク吐出の原理は従
来の圧力パルス式インクジェットと同じである。第4図
−(a)は信号電圧が圧力発生装置(50)に印加され
ていない定常状態を示す。
Next, it will be explained in detail using figures. FIG. 1-(,) is a schematic cross-sectional view of a pressure cavus type inkjet head of the present invention. The head body (1) consists of an ink inlet (2), an ink chamber (5), and a pressure generating device (1 (It). This pressure generating device consists of a metal plate (4) and a piezoelectric element (3). , the ink ejection nozzle I exists at the point of maximum amplitude of this vibration.The pattern of ink ejection by this inkjet head is schematically shown in Figure 4.The principle of ink ejection is the same as that of the conventional pressure pulse type inkjet. 4-(a) shows a steady state in which no signal voltage is applied to the pressure generator (50).

インク流入口(44)からのインクはインク供給用タン
クと外部で結合されている。このインク流入口から入っ
たインクはインクジェットヘッドのインク室(49を満
たしている。ノズル(54)ではインクに加えられた負
の静水圧と、ノズルでのインクの表面張力とがバランス
している。圧力発生装置(50)は信号電圧が印加され
ると、第4図(b)の(51)に示すように変形する。
Ink from the ink inlet (44) is externally coupled to an ink supply tank. The ink that enters from this ink inlet fills the ink chamber (49) of the inkjet head. At the nozzle (54), the negative hydrostatic pressure applied to the ink and the surface tension of the ink at the nozzle are balanced. When a signal voltage is applied to the pressure generator (50), the pressure generator (50) deforms as shown in (51) in FIG. 4(b).

その結果、インク室(451の体積は減少し、圧力発生
装置で発生した圧力により、ノズル径(50〜60μφ
)と等しい径のインク柱(55)がノズルから吐出する
。このときインク室の体積減少量は吐出インク(55)
 iとインク流入口から逃げるインクの全体積に等しい
。この印字のとき、圧力発生装置6Qのノズル部におけ
る最大変位量は最大数ミクロンである。ついで第4図(
C)に示すように信号電圧がオフになった場合、圧力発
生装置の変形は初期の状態に戻る。このときにインク流
入口からインクを吸入すると同時に、インク粒子(56
)が生じ、かつ飛翔する。その結果ヘッド内のインクは
第4図(d)に示すように初期状態に復帰する。
As a result, the volume of the ink chamber (451) decreases, and the pressure generated by the pressure generator causes the nozzle diameter (50 to 60μφ
) is ejected from the nozzle. At this time, the volume reduction amount of the ink chamber is the ejected ink (55)
i is equal to the total volume of ink escaping from the ink inlet. During this printing, the maximum displacement amount at the nozzle portion of the pressure generating device 6Q is several microns at most. Next, Figure 4 (
When the signal voltage is turned off as shown in C), the deformation of the pressure generator returns to its initial state. At this time, ink particles (56
) occurs and flies. As a result, the ink in the head returns to its initial state as shown in FIG. 4(d).

〔発明の効果〕〔Effect of the invention〕

次に本発明のインクジェットヘッドを長時間放置したと
きのインクの凝固、またはインク中のゴミ等による目づ
まりが発生した場合の効果を、第1図(b)により説明
する。圧力発生装置(10)中に設けられたノズル(L
2にインクの凝固物またはゴミ等がつまった場合、この
圧力発生装置を強制振動(9)をさせて、インク室に生
じた圧力(8)とさらにノズル部の圧力発生装置の変形
による機械的微少な変形で、強制的にインク凝固物また
はゴミを破壊またはノズルから剥離し、インクと共にイ
ンク室外部に吐出する。また強固なる目づまりに対して
は、圧力発生装置(5)とインクとの機械的共振点でよ
り強制的に圧力発生装置を振動させ、最大のノズル変形
量とインクからの圧力を得ることにより、インクの目づ
まりを解消することが可能である。
Next, the effect when the inkjet head of the present invention is left unused for a long time and clogging occurs due to ink solidification or dust in the ink will be explained with reference to FIG. 1(b). A nozzle (L) provided in the pressure generator (10)
2 is clogged with ink coagulation or dust, this pressure generating device is forced to vibrate (9) to reduce the pressure generated in the ink chamber (8) and the mechanical pressure caused by the deformation of the pressure generating device in the nozzle. With slight deformation, ink coagulation or dust is forcibly destroyed or peeled off from the nozzle, and is ejected together with the ink to the outside of the ink chamber. In addition, for severe clogging, the pressure generator (5) is forcibly vibrated at the mechanical resonance point between the ink and the pressure generator to obtain the maximum amount of nozzle deformation and pressure from the ink. It is possible to eliminate clogging of ink.

これらの工程はいづれも印字前に行ない、印字の際には
常に安定した画像を得ることができる。
All of these steps are performed before printing, and a stable image can always be obtained during printing.

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

第1図は、本発明の一実施例に係わるインクジェットヘ
ッドの模式図であって、同図(a)はヘッド断面図、同
図(b)はノズル部の目づまりの様子を示す図、第2図
は、従来の圧力パルス式インクジェットヘッドの模式図
、第3図は、従来の圧カパルヌ式インクジェットヘッド
のインク吐出説明図、第4図は、本発明のインク吐出説
明である。 1:インクヘッド本体 2:インク流入口10:圧力発
生装置   11:ノズル7:目づまりのインク凝固物
またはゴミ等代理人 弁理士 則 近 憲 佑 (ほか
1名)ヘト\さ64<p 鹸 賛べ に 飴四g昨創鼾− (a)       (b) 第8 (a)    (b) 第4 (C)      (d) 図 (C)      (d) 図
FIG. 1 is a schematic diagram of an inkjet head according to an embodiment of the present invention, in which FIG. 1(a) is a sectional view of the head, FIG. The figure is a schematic diagram of a conventional pressure pulse type inkjet head, FIG. 3 is an explanatory diagram of ink discharge of a conventional pressure pulse type inkjet head, and FIG. 4 is an explanation of ink discharge of the present invention. 1: Ink head body 2: Ink inlet 10: Pressure generating device 11: Nozzle 7: Clogged ink coagulates or dust, etc. Agent Patent attorney Noriyoshi Chika (and 1 other person) Exhausted\sa64<p Praise for Ken ni candy 4g last time snoring - (a) (b) 8th (a) (b) 4th (C) (d) Figure (C) (d) Figure

Claims (1)

【特許請求の範囲】[Claims] インク吸入口を有するインク室と、そのインク室に接し
、圧電素子と振動板とからなる圧力発生素子装置を有す
る圧力パルス式インクジェット記録装置において、前記
この圧力発生素子中にインクノズルを設けたことを特徴
とするインクジェット記録装置。
In a pressure pulse type ink jet recording device having an ink chamber having an ink suction port and a pressure generating element device in contact with the ink chamber and comprising a piezoelectric element and a diaphragm, an ink nozzle is provided in the pressure generating element. An inkjet recording device featuring:
JP5600785A 1985-03-22 1985-03-22 Ink jet recording apparatus Pending JPS61215059A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5600785A JPS61215059A (en) 1985-03-22 1985-03-22 Ink jet recording apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5600785A JPS61215059A (en) 1985-03-22 1985-03-22 Ink jet recording apparatus

Publications (1)

Publication Number Publication Date
JPS61215059A true JPS61215059A (en) 1986-09-24

Family

ID=13014992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5600785A Pending JPS61215059A (en) 1985-03-22 1985-03-22 Ink jet recording apparatus

Country Status (1)

Country Link
JP (1) JPS61215059A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0442439A2 (en) * 1990-02-13 1991-08-21 Canon Kabushiki Kaisha Ink jet recording apparatus and discharge recovery apparatus used in said apparatus
EP0911171A1 (en) * 1997-10-22 1999-04-28 Hewlett-Packard Company Cleaning of printhead nozzles using vibration
US5938117A (en) * 1991-04-24 1999-08-17 Aerogen, Inc. Methods and apparatus for dispensing liquids as an atomized spray
EP0943436A2 (en) * 1998-03-19 1999-09-22 Scitex Digital Printing, Inc. Droplet generator and method of operating a droplet generator
US6427682B1 (en) 1995-04-05 2002-08-06 Aerogen, Inc. Methods and apparatus for aerosolizing a substance
US6629646B1 (en) 1991-04-24 2003-10-07 Aerogen, Inc. Droplet ejector with oscillating tapered aperture
US6732944B2 (en) 2001-05-02 2004-05-11 Aerogen, Inc. Base isolated nebulizing device and methods
US6755189B2 (en) 1995-04-05 2004-06-29 Aerogen, Inc. Methods and apparatus for storing chemical compounds in a portable inhaler
US6782886B2 (en) 1995-04-05 2004-08-31 Aerogen, Inc. Metering pumps for an aerosolizer
WO2008044073A1 (en) * 2006-10-12 2008-04-17 The Technology Partnership Plc Liquid projection apparatus
US7654644B2 (en) 2000-05-23 2010-02-02 Silverbrook Research Pty Ltd Printhead nozzle arrangement having variable volume nozzle chamber
US7766459B2 (en) 2000-05-24 2010-08-03 Silverbrook Research Pty Ltd Multi-coloured printhead nozzle array with rows of nozzle assemblies
US7887161B2 (en) 2000-05-24 2011-02-15 Silverbrook Research Pty Ltd Inkjet printhead having an array of displacable nozzles
US8091986B2 (en) 2000-05-23 2012-01-10 Silverbrook Research Pty Ltd Nozzle arrangement including active and static ink ejecting members defining variable-volume chamber
JP2013067026A (en) * 2011-09-20 2013-04-18 Toshiba Tec Corp Inkjet head
JP2014054745A (en) * 2012-09-11 2014-03-27 Toshiba Tec Corp Ink jet head
US9108211B2 (en) 2005-05-25 2015-08-18 Nektar Therapeutics Vibration systems and methods
GB2529511A (en) * 2014-06-10 2016-02-24 Burkhard Bustgens Cleaning of nozzles from solidified coating materials
JP2016049639A (en) * 2014-08-28 2016-04-11 東芝テック株式会社 Droplet jetting device

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6550888B2 (en) 1990-02-13 2003-04-22 Canon Kabushiki Kaisha Recovery of ink jet recording apparatus using controlled suction of ink
US5245362A (en) * 1990-02-13 1993-09-14 Canon Kabushiki Kaisha Ink jet recording apparatus with discharge recovery apparatus having varying driving force
EP0442439A2 (en) * 1990-02-13 1991-08-21 Canon Kabushiki Kaisha Ink jet recording apparatus and discharge recovery apparatus used in said apparatus
US6338541B1 (en) 1990-02-13 2002-01-15 Canon Kabushiki Kaisha Ink jet recording apparatus with plural waste ink tanks
US6540153B1 (en) 1991-04-24 2003-04-01 Aerogen, Inc. Methods and apparatus for dispensing liquids as an atomized spray
US5938117A (en) * 1991-04-24 1999-08-17 Aerogen, Inc. Methods and apparatus for dispensing liquids as an atomized spray
US6629646B1 (en) 1991-04-24 2003-10-07 Aerogen, Inc. Droplet ejector with oscillating tapered aperture
US6926208B2 (en) 1991-04-24 2005-08-09 Aerogen, Inc. Droplet ejector with oscillating tapered aperture
US6427682B1 (en) 1995-04-05 2002-08-06 Aerogen, Inc. Methods and apparatus for aerosolizing a substance
US6755189B2 (en) 1995-04-05 2004-06-29 Aerogen, Inc. Methods and apparatus for storing chemical compounds in a portable inhaler
US6782886B2 (en) 1995-04-05 2004-08-31 Aerogen, Inc. Metering pumps for an aerosolizer
EP0911171A1 (en) * 1997-10-22 1999-04-28 Hewlett-Packard Company Cleaning of printhead nozzles using vibration
EP0943436A3 (en) * 1998-03-19 2000-05-17 Scitex Digital Printing, Inc. Droplet generator and method of operating a droplet generator
EP0943436A2 (en) * 1998-03-19 1999-09-22 Scitex Digital Printing, Inc. Droplet generator and method of operating a droplet generator
US7845774B2 (en) 2000-05-23 2010-12-07 Silverbrook Research Pty Ltd Printhead assembly with a gas duct
US9028048B2 (en) 2000-05-23 2015-05-12 Memjet Technology Ltd. Printhead assembly incorporating ink distribution assembly
US7654644B2 (en) 2000-05-23 2010-02-02 Silverbrook Research Pty Ltd Printhead nozzle arrangement having variable volume nozzle chamber
US9254655B2 (en) 2000-05-23 2016-02-09 Memjet Technology Ltd. Inkjet printer having laminated stack for receiving ink from ink distribution molding
US8702205B2 (en) 2000-05-23 2014-04-22 Zamtec Ltd Printhead assembly incorporating ink distribution assembly
US8388110B2 (en) 2000-05-23 2013-03-05 Zamtec Ltd Nozzle arrangement including active and static ink ejecting members defining variable-volume chamber
US7971968B2 (en) 2000-05-23 2011-07-05 Silverbrook Research Pty Ltd Printhead nozzle arrangement having variable volume nozzle chamber
US8061801B2 (en) 2000-05-23 2011-11-22 Silverbrook Research Pty Ltd Printhead assembly incorporating gas duct
US8091986B2 (en) 2000-05-23 2012-01-10 Silverbrook Research Pty Ltd Nozzle arrangement including active and static ink ejecting members defining variable-volume chamber
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