EP0305318A1 - Procédé de fabrication des canaux d'encre dans une tête d'impression pour une imprimante matricielle à jet d'encre - Google Patents

Procédé de fabrication des canaux d'encre dans une tête d'impression pour une imprimante matricielle à jet d'encre Download PDF

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Publication number
EP0305318A1
EP0305318A1 EP88730181A EP88730181A EP0305318A1 EP 0305318 A1 EP0305318 A1 EP 0305318A1 EP 88730181 A EP88730181 A EP 88730181A EP 88730181 A EP88730181 A EP 88730181A EP 0305318 A1 EP0305318 A1 EP 0305318A1
Authority
EP
European Patent Office
Prior art keywords
ink channels
ink
drive elements
plastic
inner walls
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Withdrawn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
EP88730181A
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Dipl.-Ing. Dreinhoff
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0305318A1 publication Critical patent/EP0305318A1/fr
Withdrawn legal-status Critical Current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
    • B41J2/135—Nozzles
    • B41J2/16—Production of nozzles
    • B41J2/1621—Manufacturing processes
    • B41J2/1637—Manufacturing processes molding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • 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
    • B41J2/16—Production of nozzles
    • B41J2/1607—Production of print heads with piezoelectric elements
    • B41J2/1615—Production of print heads with piezoelectric elements of tubular type

Definitions

  • the invention relates to a method in which, in order to form ink channels in a print head for an ink mosaic writing device, molding needles, each of which is cylindrically encircled by piezoelectric drive elements, are aligned in a casting mold in accordance with the desired course of the ink channels to be formed, are cast with a casting compound and after they have hardened Formation of the ink channels partially encompassed by the associated piezoelectric drive elements can be removed.
  • Known print heads for ink mosaic writing devices (cf. DE-PS 25 43 451), which work on the principle of single drop ejection (drop on demand), contain individually controllable tubes made of piezoceramic material as drive elements for ejecting ink drops from ink channels, each of which contains one in each Includes interior of the print head extending ink channel over a portion of its length; when one of the drive elements is actuated, it narrows, as a result of which an ink drop is expelled from the assigned ink channel.
  • the relatively thick wall thickness of the protective tubes with regard to the inherent stability of the protective tubes, however, requires a relatively high actuation energy for the drive elements.
  • the relatively thick walls of the protective tubes make it difficult to bring the ink channels together to form a narrow channel outlet grid (nozzle grid), especially when the drive elements are to be arranged as close as possible to the channel outlets of the ink channels.
  • the drive elements are each inserted a wire helix onto the associated molding needles with the interposition, so that during the subsequent casting the casting compound into the spaces between the drive elements and the associated molding needles penetrates and thus forms a protective layer insulating the relevant drive element from the interior of the channel.
  • the homogeneity of the protective layer is disturbed by the wire helix, so that it cannot be ruled out that particles of the casting compound may crumble away due to the resulting pressure pulses when the molding needles are removed or when the drive elements are actuated.
  • the casting mold can be poured in the immediate vicinity of the Drive elements cause a sudden transition in the inner channel wall between the insulating layer and the casting, which causes when driving the drive elements, the pressure pulse curve in the writing fluid is impaired. Cracking can also occur at this point.
  • the object of the invention is to isolate the drive elements from the writing fluid in the ink channels in a manner that is simple in terms of production technology, with the formation of continuously smooth inner walls of the channels.
  • this object is achieved in that the channel inner walls of the ink channels are then coated with a thin protective layer in the method of the type mentioned.
  • the main advantage of the method according to the invention is that the formation of the protective layer after casting the ink channels over the entire length of the ink channels uniformly smooth channel wall is formed, cracks that have occurred during the curing of the casting compound are filled, and the underlying areas are protected against the penetration of writing fluid.
  • Loosened wall areas of the channel inner walls as can occur in particular when using wire helices for the electrical contacting of the drive elements and their centering on the molding needles in accordance with DE-OS 25 43 420, are reconnected to the casting compound of the casting body; however, the use of wire helices can generally be dispensed with because of the protective layer.
  • optimal smoothing of the channel walls before they are coated is not important, it is also possible to dispense with the treatment of the shaping needles, which is usually provided, with a release agent to facilitate their removal from the cast writing head.
  • plastics that are resistant to the writing fluid can be considered as the material for the protective layer and are dense, are further wetted by the writing fluid and have good adhesion with the casting compound.
  • the ink channels are preferably filled with a hardenable liquid plastic and emptied after the inner walls of the channel have been wetted with the plastic.
  • the ink channels can be emptied by draining or suctioning off the excess liquid plastic, a thin plastic layer remaining on the inner walls of the channel, which hardens to form the protective layer.
  • the protective layer can be formed in the same way from a solution by filling the ink channels with a plastic dissolved in a solvent and emptying them after the inner walls of the channel have been wetted with the plastic.
  • the ink channels are emptied, which can be done by dripping, suctioning, blowing in air saturated with solvents or by rinsing with a solvent, a thin plastic layer forming the protective layer remains on the channel inner walls, which hardens after the solvent has evaporated.
  • the advantage here is that there is no need for additional heating of the cast writing head, so that a stress-free protective layer forms at room temperature.
  • FIG. 1 shows an essentially funnel-shaped casting mold 1 with two funnel openings 2 and 3, of which the smaller funnel opening 2 is closed with a centering plate 4.
  • the centering plate 4 contains holes 5 in accordance with the desired arrangement of the channel outlets (nozzle arrangement) in the write head to be manufactured.
  • Drive elements 7 consisting of tubular piezoceramics are plugged onto individual shaping needles 6; the molding needles 6 are centered with their tips in the bores 5 of the centering plate 4 and aligned according to the desired position of the ink channels to be formed in the writing head within the casting mold 1.
  • FIG. 2 shows a detail of the casting body 1 in the area of one of the drive elements 7.
  • the drive element 7 consists of a tubular piezoceramic body 11, which is provided on its inside and outside with an inner electrode 12 and an outer electrode 13.
  • the drive element 7 was centered on the associated shaping needle 6 (FIG. 1) by means of a wire helix 14 serving as a connecting line for the inner electrode 12, so that the area between the drive element 7 and the shaping needle 6 when the casting mold 1 was poured out was filled by the casting compound.
  • the resulting shell 15 between the interior of the ink channel 10 and the drive element 7 protects it Effects of the writing fluid contained in the ink channel 10.
  • the homogeneity of the thin shell 15 is disturbed, so that it is not excluded that when removing the shaping needle 6 or later when driving the drive elements 7 individual particles of the casting compound can crumble out of the shell 15.
  • uneven thermal shrinkage of the casting compound when it hardens and the drive element 7 lead to tension, which can lead to cracking in the shell 15.
  • the inner channel walls of the ink channels 10 are coated with a thin protective layer 16.
  • a resin based on the casting compound in a low-viscosity setting is particularly suitable as the coating material.
  • the ink channels 10 are first filled with the resin and, after their inner walls of the channel have been completely wetted, are emptied by suctioning off the excess resin, leaving behind a thin wall layer which forms the insulating layer 16 and hardens.
  • a plastic application from a solution is also suitable.
  • the channels 10 filled with a plastic solution for this purpose are emptied after complete wetting, leaving behind a thin layer which solidifies to the protective layer 16 after the solvent has evaporated; this process does not require heating of the casting body 9, so that there is a low-stress coating at room temperature.
  • the protective layer 16 itself offers protection of the drive elements 7 against the writing fluid in the ink channels 10, contacting the inner electrode 12 in a different manner than the wire coil 14 can be dispensed with.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Pens And Brushes (AREA)
EP88730181A 1987-08-28 1988-08-12 Procédé de fabrication des canaux d'encre dans une tête d'impression pour une imprimante matricielle à jet d'encre Withdrawn EP0305318A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3729206 1987-08-28
DE19873729206 DE3729206A1 (de) 1987-08-28 1987-08-28 Verfahren zum ausbilden von tintenkanaelen in einem schreibkopf fuer eine tintenmosaikschreibeinrichtung

Publications (1)

Publication Number Publication Date
EP0305318A1 true EP0305318A1 (fr) 1989-03-01

Family

ID=6334984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730181A Withdrawn EP0305318A1 (fr) 1987-08-28 1988-08-12 Procédé de fabrication des canaux d'encre dans une tête d'impression pour une imprimante matricielle à jet d'encre

Country Status (3)

Country Link
US (1) US4868582A (fr)
EP (1) EP0305318A1 (fr)
DE (1) DE3729206A1 (fr)

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EP2077132A1 (fr) 2008-01-02 2009-07-08 Boehringer Ingelheim Pharma GmbH & Co. KG Dispositif distributeur, dispositif de stockage et procédé pour la distribution d'une formulation
EP2414560B1 (fr) * 2009-03-31 2013-10-23 Boehringer Ingelheim International GmbH Procédé de revêtement d'une surface d'un composant
EP3508239B1 (fr) 2009-05-18 2020-12-23 Boehringer Ingelheim International GmbH Adaptateur, dispositif d'inhalation et pulvérisateur
MX2012005961A (es) 2009-11-25 2012-06-14 Boehringer Ingelheim Int Nebulizador.
US10016568B2 (en) 2009-11-25 2018-07-10 Boehringer Ingelheim International Gmbh Nebulizer
JP5658268B2 (ja) 2009-11-25 2015-01-21 ベーリンガー インゲルハイム インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング ネブライザ
JP5874724B2 (ja) 2010-06-24 2016-03-02 ベーリンガー インゲルハイム インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング ネブライザ
WO2012130757A1 (fr) 2011-04-01 2012-10-04 Boehringer Ingelheim International Gmbh Appareil médical pourvu d'un récipient
US9827384B2 (en) 2011-05-23 2017-11-28 Boehringer Ingelheim International Gmbh Nebulizer
WO2013152894A1 (fr) 2012-04-13 2013-10-17 Boehringer Ingelheim International Gmbh Pulvérisateur comprenant des moyens de détrompage
EP2835146B1 (fr) 2013-08-09 2020-09-30 Boehringer Ingelheim International GmbH Atomiseur
WO2015018904A1 (fr) 2013-08-09 2015-02-12 Boehringer Ingelheim International Gmbh Nébuliseur
WO2015169430A1 (fr) 2014-05-07 2015-11-12 Boehringer Ingelheim International Gmbh Nébuliseur
MX383195B (es) 2014-05-07 2025-03-13 Boehringer Ingelheim Int Recipiente, nebulizador y uso.
BR122022010094B1 (pt) 2014-05-07 2023-10-03 Boehringer Ingelheim International Gmbh Dispositivo indicador e recipiente

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4248823A (en) * 1978-12-15 1981-02-03 Ncr Corporation Method of making ink jet print head
EP0145880A2 (fr) * 1983-11-28 1985-06-26 Siemens Nixdorf Informationssysteme Aktiengesellschaft Dispositif pour la fabrication d'une tête imprimante opérant par jet d'encre

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1167690A (en) * 1968-09-30 1969-10-22 Ford Motor Co A Method of Making a Metal Coated Article
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
DE2543451C2 (de) * 1975-09-29 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Piezoelektrisch betriebener Schreibkopf für Tintenmosaikschreibeinrichtungen
DE2543420C3 (de) * 1975-09-29 1980-09-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Piezoelektrisches Antriebselement für Schreibköpfe in Tintenmosaik-Schreibeinrichtungen
EP0042932A3 (fr) * 1980-06-30 1984-07-25 International Business Machines Corporation Procédé de fabrication de corps tubulaires creux
DE3234408C2 (de) * 1982-09-16 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Schreibkopf mit piezoelektrischen Antriebselementen für Tintenschreibeinrichtungen
US4511598A (en) * 1982-10-04 1985-04-16 Xerox Corporation Electromechanical transducer protecting
JPS6024957A (ja) * 1983-07-20 1985-02-07 Seiko Epson Corp インクジエツト記録ヘツド及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4248823A (en) * 1978-12-15 1981-02-03 Ncr Corporation Method of making ink jet print head
EP0145880A2 (fr) * 1983-11-28 1985-06-26 Siemens Nixdorf Informationssysteme Aktiengesellschaft Dispositif pour la fabrication d'une tête imprimante opérant par jet d'encre

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 114 (M-26)[596], 15. August 1980, Seite 45M26; & JP-A-55 71 572 (RICOH K.K.) 29-05-1980 *

Also Published As

Publication number Publication date
DE3729206A1 (de) 1989-03-09
US4868582A (en) 1989-09-19

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