EP0966357A1 - Tete d'impression a jet d'encre continu - Google Patents

Tete d'impression a jet d'encre continu

Info

Publication number
EP0966357A1
EP0966357A1 EP97950275A EP97950275A EP0966357A1 EP 0966357 A1 EP0966357 A1 EP 0966357A1 EP 97950275 A EP97950275 A EP 97950275A EP 97950275 A EP97950275 A EP 97950275A EP 0966357 A1 EP0966357 A1 EP 0966357A1
Authority
EP
European Patent Office
Prior art keywords
intermediate element
plane
support
droplet generator
ink streams
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Withdrawn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
EP97950275A
Other languages
German (de)
English (en)
Inventor
Ian Michael Fost
Jerzy Marcin Zaba
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.)
Domino Printing Sciences PLC
Original Assignee
Domino Printing Sciences PLC
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 Domino Printing Sciences PLC filed Critical Domino Printing Sciences PLC
Publication of EP0966357A1 publication Critical patent/EP0966357A1/fr
Withdrawn legal-status Critical Current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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/09—Deflection means

Definitions

  • the present invention relates to continuous inkjet (CIJ) printers and, more particularly, to printheads of the multi-nozzle type.
  • CIJ continuous inkjet
  • Multi-nozzle continuous inkjet printers have been developed in order to provide high quality, high speed printing.
  • a row of inkjet nozzles at very close spacings are provided and individual streams of ink issue from each of the nozzles continuously in use, being broken up into individual droplets automatically.
  • the individual droplets are charged appropriately to cause them to be printed or else deflected into a gutter.
  • Printers of this type are described, for example, in US-A-4613871 and US-A-4427986.
  • the printers described in these specifications are of the type generally known as binary continuous multi-jet.
  • Multi-jet printers of this type have alignment and set-up requirements which are additional to those of single jet printers, it being necessary to ensure that the rows of nozzles or jets are all accurately aligned with the gutter, that each stream of droplets is accurately aligned with a respective charge electrode and that the charge electrodes are uniformly spaced from the respective droplet streams, ie. that the plane of the droplet streams and the row of charge electrodes are parallel to one another.
  • a multi-nozzle CIJ printhead having a droplet generator has a pair of deflection electrodes, one disposed on each side of the plane of the ink streams issuing from the nozzles, one of the deflection electrodes being mounted for adjustment on a support for the droplet generator by means of an intermediate element secured to the support, the intermediate element being movable so as to adjust the position of the deflection electrode towards and away from the plane of the ink streams and the angle of the plane of the deflection electrode relative to the plane of the ink streams .
  • the intermediate element is adjustable about three axes defined by three adjustable stops arranged triangularly.
  • the stops may be formed by screw-threaded bolts extending through the intermediate element and bearing on opposed portions of the support.
  • the intermediate element is preferably secured to the support by a mounting screw which allows adjustment of the adjustable stops without distortion of the intermediate element.
  • Suitable helical springs or similar may be used to bias the intermediate element against the stops.
  • the intermediate element is also pivotally mounted on the support so that the deflection electrode can be swung away from the ink streams.
  • Figure 1 is a side view of a printhead of a multi- nozzle CIJ printer of the type described in our EP-A- 0780231;
  • Figures 2A to 2D are inner and outer face views, a top plan view, and a side cross-sectional view respectively of a droplet generator support of the type described in our British Patent Application no. 9626683.8; and
  • Figures 3A to 3E are inner and outer face views, a pair of cross-sectional views, and a bottom plan view of the intermediate element used in accordance with the present invention.
  • Figures 4A & 4B show an alternative construction in views similar to Figures 1 and 2B.
  • the printhead has an electronics sub-system 1 by means of which are controlled the piezoelectric oscillator 2 forming part of a droplet generator 3 which has a nozzle plate 4 from which, in use, issue plural streams 5 of ink.
  • the closely spaced nozzles are arranged in a row normal to the plane of the drawing.
  • the streams of ink break up into individual droplets which pass respective charge electrodes 6 also arranged in a row in the same direction, where they are selectively charged and then passed between a pair of deflection electrodes 7, 7' which establish, in use, an electric field by means of which charged droplets are deflected from their straight-line path into a gutter 8.
  • Figure 2A to 3E illustrate the deflection electrode 7 1 mounting components.
  • the droplet generator 3 is supported on a frame 9 by a flexure-type support 10 embodying the principles of the invention described in our British Patent Application no. 9626683.8.
  • the flexure 10 has top and bottom end portions 12, 12' which are interconnected by integral thin flexible parallel beam portions 14 and is formed of stainless steel or a similar material.
  • the lower end portion 12' is provided with a pair of mounting apertures 16 for the gun body or droplet generator 3.
  • Extending from the centre of the end portion 12 ' is a central protrusion 15 which is disposed between the ends 18 of a yoke-like protrusion 19 extending inwardly of the flexure from the upper (as seen in the Figures) end portion 12.
  • the upper end portion 12 has a mounting aperture 20 and (on the side opposite that which is seen in the Figures) a flange 21 which is also used for mounting the flexure to a supporting frame as described in our British Patent application no. 9626704.2 and our co-pending International Patent application reference MJB05497WO.
  • a pair of adjusting screws (not shown) are located in corresponding screw-threaded bores 23 in the end portions 18 of the yoke-like projection 19 and each of the screws has an end which engages in a corresponding socket 25 in the protrusion 15.
  • the screws thus control the relative positions of the projections 15, 18 and thus of the end portions 12, 12' in the direction generally perpendicular to the parallel beam portions 14 and allow adjustment from the neutral position to a flexed position (not shown) by appropriate rotation of the screws in opposite directions.
  • the inner side or face of the upper end portion 12 has a transverse 22 slot which intersects a longitudinal groove 26 and which also includes, one at each end, a pair of screw-threaded bores 27.
  • the lower portion 12' has a longitudinal central groove 28 (in extension of the groove 26) which has a screw-threaded bore 30 and a recessed cup 29.
  • Figures 3A to 3E show an intermediate support element 40 in the shape of an inverted T, has a first, longitudinal limb 41 and a second, transverse limb 42.
  • a mounting flange 43 for the deflection electrode 7' extends from the inner face of the transverse limb 42.
  • the longitudinal limb 41 is a loose fit within the grooves 26,28 and the intermediate element 40 is held in position on the support 10 by a cross-pin 44 fitted in a cross bore 45 at the top of the limb 41 and the ends of which are trapped below the heads of screws fitted in the bores 27.
  • This allows the element 40 to pivot but also allows the cross pin to float, in turn allowing adjustment of the position of the element 40 by means of adjustment stops in the form of screws (not shown) held in screw- threaded bores 46,47 located respectively at the ends of the transverse limb 42 and towards the top end of the longitudinal limb 41 and bearing in cups 31 & 29 respectively.
  • a further screw fits within a stepped bore 48 at the junction of the limbs 41 & 42 and screws into the screw-threaded bore 30 in the support 10 in order to hold the element 40 on the support 10.
  • the element 40 can be pivoted to allow the deflection electrode 7' to be moved away from its normal position.
  • FIG. 4A & 4B An alternative construction is shown in assembled condition in figures 4A & 4B.
  • This example which is only very slightly modified from the previous example (and which carries corresponding reference numerals for corresponding features) , shows fine adjustment of the angle of the deflection electrode 7' (and hence of the spacing of its ends relative to the plane of the droplets) to be achieved in the same manner as the previous example by use of the adjusting screws 50 in their respective bores 46.

Landscapes

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

Abstract

L'invention concerne une tête d'impression à jet d'encre continu à plusieurs buses. Cette tête comporte plusieurs courants d'encre (5) provenant d'un générateur (3) de gouttelettes dans un plan (5'). Deux électrodes de déviation (7, 7') sont placées de chaque côté du plan (5') des courants d'encre provenant des buses. Une des électrodes de déviation (7') est fixée sur un élément intermédiaire (40) fixé au support (10) de générateur de gouttelettes en vue du réglage sur le générateur de gouttelettes. L'élément intermédiaire peut se déplacer de manière à ajuster la position de l'électrode de déviation (7') vers le plan (5') des courants d'encre, et dans une direction opposée à ce dernier, et ajuster l'angle de l'électrode de déviation (7') par rapport au plan des courants d'encre (5).
EP97950275A 1996-12-23 1997-12-18 Tete d'impression a jet d'encre continu Withdrawn EP0966357A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9626787.7A GB9626787D0 (en) 1996-12-23 1996-12-23 Continuous inkjet print head
GB9626787 1996-12-23
PCT/GB1997/003485 WO1998028146A1 (fr) 1996-12-23 1997-12-18 Tete d'impression a jet d'encre continu

Publications (1)

Publication Number Publication Date
EP0966357A1 true EP0966357A1 (fr) 1999-12-29

Family

ID=10804963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97950275A Withdrawn EP0966357A1 (fr) 1996-12-23 1997-12-18 Tete d'impression a jet d'encre continu

Country Status (5)

Country Link
EP (1) EP0966357A1 (fr)
JP (1) JP2001506936A (fr)
CN (1) CN1247504A (fr)
GB (1) GB9626787D0 (fr)
WO (1) WO1998028146A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69910340T2 (de) * 1998-12-14 2004-07-01 Scitex Digital Printing, Inc., Dayton Monolithisches Tintenstrahldruckchassis
US7331657B2 (en) * 2004-06-17 2008-02-19 Videojet Technologies, Inc. High voltage arm assembly with integrated resistor, automatic high voltage deflection electrode locator, and special insulation
CA2951034C (fr) 2014-06-05 2022-08-23 Videojet Technologies Inc. Module de filtre auto-etanche pour impression a jet d'encre
WO2015187926A1 (fr) 2014-06-05 2015-12-10 Videojet Technologies Inc. Agencement de capteur d'accumulation d'encre
CN106457831B (zh) 2014-06-05 2019-04-19 录象射流技术公司 具有零调整的嵌入式充电电极的连续喷墨打印头
GB2575986A (en) 2018-07-30 2020-02-05 Domino Uk Ltd Solvent supply tube arrangement
WO2021111657A1 (fr) * 2019-12-06 2021-06-10 株式会社日立産機システム Dispositif d'impression à jet d'encre

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639737A (en) * 1985-10-10 1987-01-27 Burlington Industries, Inc. Tensionable electrodes for charging and/or deflecting fluid droplets in fluid-jet marking apparatus
JPS62216754A (ja) * 1986-03-19 1987-09-24 Ricoh Co Ltd インクジエツトプリンタの偏向電極構造

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9828146A1 *

Also Published As

Publication number Publication date
WO1998028146A1 (fr) 1998-07-02
CN1247504A (zh) 2000-03-15
JP2001506936A (ja) 2001-05-29
GB9626787D0 (en) 1997-02-12

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