EP0445137B1 - Tete d'ecriture a jet d'encre - Google Patents

Tete d'ecriture a jet d'encre Download PDF

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Publication number
EP0445137B1
EP0445137B1 EP89912438A EP89912438A EP0445137B1 EP 0445137 B1 EP0445137 B1 EP 0445137B1 EP 89912438 A EP89912438 A EP 89912438A EP 89912438 A EP89912438 A EP 89912438A EP 0445137 B1 EP0445137 B1 EP 0445137B1
Authority
EP
European Patent Office
Prior art keywords
ink jet
sealing sleeve
tie
ink
writing 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.)
Expired - Lifetime
Application number
EP89912438A
Other languages
German (de)
English (en)
Other versions
EP0445137A1 (fr
Inventor
Manfred Pauly
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.)
REA Elektronik GmbH
Original Assignee
REA Elektronik GmbH
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 REA Elektronik GmbH filed Critical REA Elektronik GmbH
Priority to AT89912438T priority Critical patent/ATE89221T1/de
Publication of EP0445137A1 publication Critical patent/EP0445137A1/fr
Application granted granted Critical
Publication of EP0445137B1 publication Critical patent/EP0445137B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • 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
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/05—Heads having a valve

Definitions

  • the invention relates to an ink jet writing head, in particular for marking devices, with an ink chamber connected to an ink pressure source, in which a plurality of closure bodies, each closing an ink spray nozzle, are arranged, each of which is connected to a pull rod which is axially movable from the ink chamber through in each case an actuating opening are brought out and connected to a drive device, a connecting rod seal being arranged between each actuating opening and the pull rod.
  • Such ink-jet writing heads are used in particular as writing heads for marking devices with which labeling is applied to objects, for example packs, which are moved along the writing head.
  • the ink spray nozzles of the print head are arranged in a row close to one another and are actuated by the drive devices assigned to each individual closure body by means of a control device in such a way that the desired inscription is produced on the object being guided past.
  • a constructive difficulty of such ink jet print heads is that the individual ink spray nozzles must be arranged sufficiently close to one another, but that the drive devices, usually electromagnets, are of such dimensions that they are not as dense as the ink spray nozzles can be arranged side by side. For this reason, the drive devices are usually fanned out on both sides of the plane containing the ink spray nozzles, and their drive movement is transmitted to the closure bodies. This transmission can be carried out by flexible wires, each of which is connected on the one hand to the closure body and on the other hand to an actuating magnet as the drive device (DE-A-33 02 617). Instead, it is also known to connect each closure body to a pull rod which is connected at its end remote from the closure body to a tongue of an armature of an electromagnet.
  • the object of the invention is therefore to design an inkjet write head of the type mentioned in such a way that a complete and effective sealing of the pull rods led out of the ink chamber is made possible without impairment of function.
  • the pull rod seal is deformable in the axial direction of the pull rod and is firmly connected to both the actuating opening and the pull rod, and in that the pull rod seal is a truncated cone-shaped sealing sleeve or sealing sleeve which seals with its further end at the edge of the actuating opening is attached and with its narrower end sealingly engages around the pull rod.
  • the seal according to the invention can be made very slim. Their radial dimensions are no greater than the distance specified by the distance between adjacent ink spray nozzles.
  • the tie rod seal is designed as a truncated cone-shaped sealing sleeve, which is fastened sealingly with its further end to the edge of the actuating opening and, with its narrower end, surrounds the push rod in a sealing manner.
  • Such slim sealing sleeves can be designed, for example, as bellows. The high deformability provided by this design enables the sealing sleeve to be made of metal.
  • sealing sleeve can also be designed as an essentially smooth truncated cone; in this embodiment e.g. elastically deformable plastic or preferably rubber or rubber used.
  • ink chamber 1 has an ink chamber 2, which is connected via a line 3 to an ink pressure source (not shown), for example an ink pump.
  • ink pressure source for example an ink pump.
  • a plurality of ink spray nozzles 5 are arranged in a row in a front wall 4 of the ink chamber 2.
  • the ink jet emerging in each case from an ink spray nozzle 5 strikes an object 6 to be signed that is moved along at a distance from the wall 4, the outer surface of which is only indicated in FIG. 1 by a dash-dotted line.
  • each closure body 7 is arranged in front of each ink spray nozzle 5.
  • a pull rod 8 for example designed as a tube, which by a Actuating opening 9 is led out of the ink chamber 2 and is connected at its other end to a movable armature 10 of an electromagnet 11, which forms the drive device for the closure body 7.
  • the pull rod 8 can also be designed flexibly as a wire.
  • a seal is arranged, which is designed as a slim, truncated cone-shaped sealing sleeve or sealing sleeve 12, which is fastened sealingly with its further end to the edge of the actuating opening 9 and with its narrower end the pull rod 8 sealing embraces. Details and embodiments of this seal are shown in FIGS. 2 and 3.
  • the pull rod 8 is guided axially movably in the ink chamber 2 in a guide 13, but this does not constitute a seal for the ink.
  • a tube 14 connects to the guide 13.
  • the end of the tube 14 facing the guide 13 forms the actuating opening 9.
  • the tube end holds a bead 15 which forms the further end of the sealing sleeve 12, which is designed here as a smooth truncated cone. In this way, the sealing sleeve 12 is sealingly received in the actuation opening 9.
  • the sealing sleeve 12 tapers in the direction away from the guide 13 and encloses the tie rod 8 in a sealing manner with its narrower tubular end 16.
  • the sealing sleeve 12 consists here, for example, of elastically deformable plastic or preferably of rubber.
  • Fig. 3 differs from the embodiment of Fig. 2 in that the substantially frusto-conical sealing sleeve 12 'is a metallic bellows, which is received with its other end on the end facing away from the ink chamber 2 of the tube 14 sealing .
  • This end of the tube 14 forms the actuation opening 9.
  • the sealing sleeve 12 'tapers in the direction of the ink jet chamber 2 and encloses the pull rod 8 with its narrower end as described. Also in this embodiment, when the pull rod 8 is actuated axially, the sealing sleeve 12 is elastically deformed in the axial direction of the pull rod 8 without any sealing friction .

Landscapes

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

Abstract

Une chambre à encre (2) reliée à une source de pression pour l'encre est agencée dans une tête d'écriture à jet d'encre (1), conçue en particulier pour les appareils à marquer. Plusieurs éléments d'obturation (7), qui obturent chacun une buse de jet d'encre (5), sont agencés dans la chambre à encre (2). Chaque élément d'obturation (7) est relié à un élément d'entraînement par l'intermédiaire d'une tige de traction (8). Chaque tige de traction (8) sort de la chambre à encre (2) à travers une ouverture d'actionnement (9). Une garniture de tige de traction, agencée sur chacune des ouvertures d'actionnement (9), consiste en une mince gaine d'étanchéité (12) de forme tronconique, élastiquement déformable dans le sens axial, dont l'extrémité la plus large est reliée au bord de l'ouverture d'actionnement (9) de manière à la rendre étanche, tandis que son extrémité étroite entoure la tige de traction (8) de manière étanche. Lorsque la tige de traction (8) se déplace axialement, la gaine d'étanchéité (12) ne se déforme qu'axialement, sans friction.

Claims (9)

  1. Tête d'écriture à jet d'encre, en particulier pour appareils à marquer, comportant une chambre à encre (2) raccordée à une source de pression, dans laquelle chambre sont agencés plusieurs corps de fermeture (7) fermant respectivement un gicleur à encre (5), qui sont reliés à des tiges de traction respectives qui peuvent être déplacées axialement hors de la chambre à encre (2), respectivement, à travers une ouverture de manoeuvre (9) et sont raccordées à un dispositif d'entrainement (10, 11), un joint d'étanchéité (12, 12') étant agencé entre chaque ouverture de manoeuvre (9) et la tige de traction (8), caractérisée en ce que le joint étanche (12, 12') de la tige de traction (8) est raccordé fixe à l'ouverture de manoeuvre (9) ainsi qu'à la tige de traction (8) de manière à pouvoir se déformer dans la direction axiale de la tige de traction (8) et le joint étanche de la tige de traction est formé d'une douille ou d'une gaine d'étanchéité en forme de tronc de cône (12, 12'), qui est fixée de manière étanche, à son extrémité la plus large (15), sur la périphérie de l'ouverture de manoeuvre (9) et enserre de manière étanche la tige de traction (8) à son extrémité la plus étroite (16).
  2. Tête d'écriture à jet d'encre selon la revendication 1, caractérisée en ce que la gaine d'étanchéité (12') se présente sous la forme d'un soufflet.
  3. Tête d'écriture à jet d'encre selon la revendication 2, caractérisée en ce que la gaine d'étanchéité (12') est constituée de métal.
  4. Tête d'écriture à jet d'encre selon la revendication 1, caractérisée en ce que la gaine d'étanchéité (12) est constituée d'une matière plastique déformable élastiquement, de gomme ou de caoutchouc et forme un tronc de cône sensiblement lisse.
  5. Tête d'écriture à jet d'encre selon la revendication 1, caractérisée en ce qu'on agence dans la chambre à encre (2) une coulisse (13) pour chaque tige de traction (8) et la gaine d'étanchéité (12, 12') se trouve sur le côté de la coulisse (13) opposé au corps de fermeture (7).
  6. Tête d'écriture à jet d'encre selon la revendication 5, caractérisée en ce que la gaine d'étanchéité (12') de l'ouverture de manoeuvre (9) se rétrécit dans la direction de la coulisse (13).
  7. Tête d'écriture à jet d'encre selon la revendication 5, caractérisée en ce que la gaine d'étanchéité (12) de l'ouverture de manoeuvre (9) se rétrécit depuis la coulisse (13).
  8. Tête d'écriture à jet d'encre selon la revendication 1, caractérisée en ce que la gaine d'étanchéité (12, 12') est agencée dans un tube (14) raccordé à la chambre à encre (2) et enserrant la tige de traction (8) de manière concentrique à distance de celle-ci.
  9. Tête d'écriture à jet d'encre selon la revendication 8, caractérisée en ce que la première extrémité du tube (14) est raccordée de manière étanche à la gaine d'étanchéité (12, 12').
EP89912438A 1988-11-05 1989-10-30 Tete d'ecriture a jet d'encre Expired - Lifetime EP0445137B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89912438T ATE89221T1 (de) 1988-11-05 1989-10-30 Tintenstrahl-schreibkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837680A DE3837680A1 (de) 1988-11-05 1988-11-05 Tintenstrahl-schreibkopf
DE3837680 1988-11-05

Publications (2)

Publication Number Publication Date
EP0445137A1 EP0445137A1 (fr) 1991-09-11
EP0445137B1 true EP0445137B1 (fr) 1993-05-12

Family

ID=6366622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89912438A Expired - Lifetime EP0445137B1 (fr) 1988-11-05 1989-10-30 Tete d'ecriture a jet d'encre

Country Status (3)

Country Link
EP (1) EP0445137B1 (fr)
DE (2) DE3837680A1 (fr)
WO (1) WO1990005066A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013013983A1 (fr) 2011-07-22 2013-01-31 Durst Phototechnik - A.G. Tête d'impression pour imprimante à jet d'encre
EP2716459A1 (fr) 2012-10-02 2014-04-09 EBS Ink-Jet Systeme GmbH Tête d'écriture à jet d'encre avec élément d'étanchéité
DE102005020248B4 (de) * 2004-10-25 2014-08-28 Rea Elektronik Gmbh Tintenstrahl-Schreibkopf
DE102005031034B4 (de) * 2005-07-02 2021-03-18 Rea Elektronik Gmbh Tintenstrahl-Schreibkopf

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10065287A1 (de) * 2000-12-29 2002-07-04 Bauer Wulf Tintenstrahl-Schreibkopf
WO2005084952A1 (fr) 2004-03-03 2005-09-15 Rea Elektronik Gmbh Tete d'ecriture a jet d'encre
WO2005110759A1 (fr) 2004-05-11 2005-11-24 Rea Elektronik Gmbh Tete d'impression a jet d'encre

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033717A1 (fr) * 1980-01-30 1981-08-12 Battelle Development Corporation Procédé pour fractionner un jet en une pluralité de gouttes calibrées, et dispositif pour réaliser ce procédé
DE3302617A1 (de) * 1983-01-27 1984-08-02 Cyklop International Emil Hoffmann KG, 5000 Köln Farbspritzkopf

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020248B4 (de) * 2004-10-25 2014-08-28 Rea Elektronik Gmbh Tintenstrahl-Schreibkopf
DE102005031034B4 (de) * 2005-07-02 2021-03-18 Rea Elektronik Gmbh Tintenstrahl-Schreibkopf
WO2013013983A1 (fr) 2011-07-22 2013-01-31 Durst Phototechnik - A.G. Tête d'impression pour imprimante à jet d'encre
US9751313B2 (en) 2011-07-22 2017-09-05 Durst Phototechnik—A.G. Print head for an ink jet printer
US9994029B2 (en) 2011-07-22 2018-06-12 Durst Phototechnik—A.G. Print head for an ink jet printer
EP2716459A1 (fr) 2012-10-02 2014-04-09 EBS Ink-Jet Systeme GmbH Tête d'écriture à jet d'encre avec élément d'étanchéité

Also Published As

Publication number Publication date
WO1990005066A1 (fr) 1990-05-17
DE58904370D1 (de) 1993-06-17
EP0445137A1 (fr) 1991-09-11
DE3837680A1 (de) 1990-05-10

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