GB2052393A - Ink jet printers - Google Patents

Ink jet printers Download PDF

Info

Publication number
GB2052393A
GB2052393A GB7921337A GB7921337A GB2052393A GB 2052393 A GB2052393 A GB 2052393A GB 7921337 A GB7921337 A GB 7921337A GB 7921337 A GB7921337 A GB 7921337A GB 2052393 A GB2052393 A GB 2052393A
Authority
GB
United Kingdom
Prior art keywords
ink
nozzle
cavity
print head
orb
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.)
Withdrawn
Application number
GB7921337A
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.)
ITT Creed Ltd
Original Assignee
ITT Creed 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 ITT Creed Ltd filed Critical ITT Creed Ltd
Priority to GB7921337A priority Critical patent/GB2052393A/en
Priority to DE19803021715 priority patent/DE3021715A1/en
Publication of GB2052393A publication Critical patent/GB2052393A/en
Withdrawn legal-status Critical Current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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14419—Manifold

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

In an "on-demand" ink-jet printer, a pair of piezo-electric elements (7 and 8) are fixed to opposite sides of the print head so that the application to the elements of a print signal varies the dimensions of the ink cavity (1b) through which ink continuously flows and thus causes the ink to be ejected from a nozzle (4) communicating with the cavity. The head may be formed from a pair of complementary shaped plates to which the elements (7, 8) are fixed. <IMAGE>

Description

SPECIFICATION Inlk jet prErllt:ers This invention relates to ink-jet printers and in particular to those of the so-called "on-demand" type wherein a print head is continuously supplied with a flow of ink, droplets of which can be ejaculated from a nozzle in response to an appropriate signal.
According to the invention in its broadest aspect, there is provided an ink-jet printer comprising a print head arranged to be supplied with a continuous flow of ink, droplets of which can be ejaculated from a nozzle in response to an appropriate signal, the head containing a cavity through which ink can pass and from which it can enter the nozzle and the signal being simultaneously applied to a pair of piezoelectric elements respectively fixed to either side of the print head adjacent the cavity whereby the resulting deformation of the piezo-electric elements changes the dimensions of the cavity and forces ink out of the nozzle.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is an end elevation of the print head, and Figs. 2a and 2b are elevations of the two halves of the print head.
The two halves ofthe print head are made of Perspex (Registered Trade Mark) or similar material and each is formed with a tapered groove la orb interconnecting an inlet groove 2a orb and an outlet groove 3a orb. A nozzle groove 4a orb opens into the groove la orb. When the two halves are glued or otherwise joined together, they form a print head provided with a tapered cavity 1 interconnecting inlet and outlet ports 2 and 3 and a nozzle 4 communicating with the cavity 1. Perforated lugs Sa orb and Se orb assist in accurately locating the two halves before joining. Piezo-electric elements 7 and 8 are glued or otherwise attached to the two halves of the head.
In use, ink is supplied continuously to the head by two pumps (not shown) upstream and downstream respectively of the inlet and outlet ports 2 and 3. The cavity 1 is relatively shallow in proportion to the width of the head so as to produce a streamline flow of ink through it to maintain a concave meniscus at the nozzle 4. Ink leakage from the nozzle is prevented by the differential pressure obtained by using two F;lmps. The tapering of the cavity 1 results in an acceleration of the ink flow ti rough the cavity and the purging of any air bubbles.
When a voltage pulse is simultaneously applied to the piezo-electric elements 7 and 8 the latter are momentarily deformed thus changing the dimensions of the cavity 1 and forcing ink out of the nozzle 4. The dimensions of the nozzle, the duration and amplitude of the voltage pulse determine the size of the ink droplets ejaculated from the nozzle.
1. An ink-jet printer comprising a print head arranged to be supplied with a continuous flow of ink, droplets of which can be ejaculated from a nozzle in response to an appropriate signal, the head containing a cavity through which ink can continuously pass and from which it can enter the nozzle and the signal being simultaneously applied to a pair of piezo-electric elements fixed to either side of the print head adjacent the cavity whereby the resulting deformation of the piezo-electric elements changes the dimensions of the cavity and forces ink out ofthe nozzle.
2. An ink-jet printers claimed in claim 1, in which the cavity is tapered progressively from the ink inlet to the ink outlet so as to produce a progressive increase in the velocity of the ink flow as it passes the nozzle.
3. An ink jet printer comprising a print head sub stantially as described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Inlk jet prErllt:ers This invention relates to ink-jet printers and in particular to those of the so-called "on-demand" type wherein a print head is continuously supplied with a flow of ink, droplets of which can be ejaculated from a nozzle in response to an appropriate signal. According to the invention in its broadest aspect, there is provided an ink-jet printer comprising a print head arranged to be supplied with a continuous flow of ink, droplets of which can be ejaculated from a nozzle in response to an appropriate signal, the head containing a cavity through which ink can pass and from which it can enter the nozzle and the signal being simultaneously applied to a pair of piezoelectric elements respectively fixed to either side of the print head adjacent the cavity whereby the resulting deformation of the piezo-electric elements changes the dimensions of the cavity and forces ink out of the nozzle. An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is an end elevation of the print head, and Figs. 2a and 2b are elevations of the two halves of the print head. The two halves ofthe print head are made of Perspex (Registered Trade Mark) or similar material and each is formed with a tapered groove la orb interconnecting an inlet groove 2a orb and an outlet groove 3a orb. A nozzle groove 4a orb opens into the groove la orb. When the two halves are glued or otherwise joined together, they form a print head provided with a tapered cavity 1 interconnecting inlet and outlet ports 2 and 3 and a nozzle 4 communicating with the cavity 1. Perforated lugs Sa orb and Se orb assist in accurately locating the two halves before joining. Piezo-electric elements 7 and 8 are glued or otherwise attached to the two halves of the head. In use, ink is supplied continuously to the head by two pumps (not shown) upstream and downstream respectively of the inlet and outlet ports 2 and 3. The cavity 1 is relatively shallow in proportion to the width of the head so as to produce a streamline flow of ink through it to maintain a concave meniscus at the nozzle 4. Ink leakage from the nozzle is prevented by the differential pressure obtained by using two F;lmps. The tapering of the cavity 1 results in an acceleration of the ink flow ti rough the cavity and the purging of any air bubbles. When a voltage pulse is simultaneously applied to the piezo-electric elements 7 and 8 the latter are momentarily deformed thus changing the dimensions of the cavity 1 and forcing ink out of the nozzle 4. The dimensions of the nozzle, the duration and amplitude of the voltage pulse determine the size of the ink droplets ejaculated from the nozzle. CLAIMS
1. An ink-jet printer comprising a print head arranged to be supplied with a continuous flow of ink, droplets of which can be ejaculated from a nozzle in response to an appropriate signal, the head containing a cavity through which ink can continuously pass and from which it can enter the nozzle and the signal being simultaneously applied to a pair of piezo-electric elements fixed to either side of the print head adjacent the cavity whereby the resulting deformation of the piezo-electric elements changes the dimensions of the cavity and forces ink out ofthe nozzle.
2. An ink-jet printers claimed in claim 1, in which the cavity is tapered progressively from the ink inlet to the ink outlet so as to produce a progressive increase in the velocity of the ink flow as it passes the nozzle.
3. An ink jet printer comprising a print head sub stantially as described with reference to the accompanying drawings.
GB7921337A 1979-06-19 1979-06-19 Ink jet printers Withdrawn GB2052393A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB7921337A GB2052393A (en) 1979-06-19 1979-06-19 Ink jet printers
DE19803021715 DE3021715A1 (en) 1979-06-19 1980-06-10 WRITING HEAD FOR INK SPRAY PRINTING

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7921337A GB2052393A (en) 1979-06-19 1979-06-19 Ink jet printers

Publications (1)

Publication Number Publication Date
GB2052393A true GB2052393A (en) 1981-01-28

Family

ID=10505950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7921337A Withdrawn GB2052393A (en) 1979-06-19 1979-06-19 Ink jet printers

Country Status (2)

Country Link
DE (1) DE3021715A1 (en)
GB (1) GB2052393A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5959643A (en) * 1990-05-08 1999-09-28 Xaar Technology Limited Modular drop-on-demand printing apparatus method of manufacture thereof, and method of drop-on-demand printing
GB2520574A (en) * 2013-11-26 2015-05-27 Xaar Technology Ltd Droplet deposition apparatus and method for manufacturing the same
CN106573468A (en) * 2014-07-02 2017-04-19 萨尔技术有限公司 Droplet deposition apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5959643A (en) * 1990-05-08 1999-09-28 Xaar Technology Limited Modular drop-on-demand printing apparatus method of manufacture thereof, and method of drop-on-demand printing
GB2520574A (en) * 2013-11-26 2015-05-27 Xaar Technology Ltd Droplet deposition apparatus and method for manufacturing the same
GB2520574B (en) * 2013-11-26 2015-10-07 Xaar Technology Ltd Droplet deposition apparatus and method for manufacturing the same
CN105934348A (en) * 2013-11-26 2016-09-07 萨尔技术有限公司 Droplet deposition apparatus and method for manufacturing the same
CN105934348B (en) * 2013-11-26 2018-09-28 赛尔科技有限公司 Oroplet deposition apparatus and the method for manufacturing the device
CN109263281A (en) * 2013-11-26 2019-01-25 赛尔科技有限公司 Oroplet deposition apparatus and the method for manufacturing the device
CN109263281B (en) * 2013-11-26 2020-10-20 赛尔科技有限公司 Droplet deposition apparatus and method of making the same
CN106573468A (en) * 2014-07-02 2017-04-19 萨尔技术有限公司 Droplet deposition apparatus
CN106573468B (en) * 2014-07-02 2019-07-26 赛尔科技有限公司 Oroplet deposition apparatus

Also Published As

Publication number Publication date
DE3021715A1 (en) 1981-01-29

Similar Documents

Publication Publication Date Title
US4364066A (en) Ink jet printing head
US4380018A (en) Ink droplet projecting device and an ink jet printer
US6334671B1 (en) Ink jet recording head and method for manufacturing the same
EP0960025B1 (en) Gas assisted ink jet apparatus and method
JPS62152860A (en) Liquid jet recording head
JP3623249B2 (en) Recording head for inkjet printer
GB2052393A (en) Ink jet printers
JPS6315756A (en) Large array ing jet droplet generator using solid-state acoustic cavity
US4641155A (en) Printing head for ink jet printer
JPH022004A (en) Ink jet head
JPH0499634A (en) Ink jet head
JPS61239948A (en) Printing head of ink jet printer
JP2547578B2 (en) Spray gun
JP3320137B2 (en) Ink jet recording head and ink jet recording apparatus
JP3296391B2 (en) Ink jet recording head
EP0067948A1 (en) Method and apparatus for producing liquid drops on demand
JP2001191518A (en) Ink jet head
JPS625855A (en) Ink jet recorder
JP3043538B2 (en) Ink head recovery device for inkjet recording device
JPS6241111B2 (en)
JPH0345813Y2 (en)
JPH024519A (en) Ink jet recording head
JPS6315916B2 (en)
JPS6234550B2 (en)
JPH0344530Y2 (en)

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)