EP0121894B1 - Tête d'écriture commandée par piézo-électricité pour dispositifs d'écriture à mosaique d'encre - Google Patents

Tête d'écriture commandée par piézo-électricité pour dispositifs d'écriture à mosaique d'encre Download PDF

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Publication number
EP0121894B1
EP0121894B1 EP84103655A EP84103655A EP0121894B1 EP 0121894 B1 EP0121894 B1 EP 0121894B1 EP 84103655 A EP84103655 A EP 84103655A EP 84103655 A EP84103655 A EP 84103655A EP 0121894 B1 EP0121894 B1 EP 0121894B1
Authority
EP
European Patent Office
Prior art keywords
ink
print head
ducts
write head
filter material
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
Application number
EP84103655A
Other languages
German (de)
English (en)
Other versions
EP0121894A3 (en
EP0121894A2 (fr
Inventor
Rolf Roeschlein
Heinz Schulte
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.)
Wincor Nixdorf International GmbH
Nixdorf Computer AG
Original Assignee
Wincor Nixdorf International GmbH
Nixdorf Computer AG
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 Wincor Nixdorf International GmbH, Nixdorf Computer AG filed Critical Wincor Nixdorf International GmbH
Publication of EP0121894A2 publication Critical patent/EP0121894A2/fr
Publication of EP0121894A3 publication Critical patent/EP0121894A3/de
Application granted granted Critical
Publication of EP0121894B1 publication Critical patent/EP0121894B1/fr
Expired 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17563—Ink filters

Definitions

  • the invention relates to a piezoelectrically operated writing head for ink mosaic writing devices with a plurality of writing nozzles in the form of ink channels receiving writing fluid, each of which is enclosed by a piezoelectric drive element and is connected to an ink space common to them via a filter arrangement, the ink channels being of substantially greater length than the drive elements to have.
  • a write head of this type is e.g. B. from DE-PS 25 43 451 known. Its ink channels open with their nozzle openings at the tip of the print head in a grid-like distribution, which makes it possible to record characters on a record carrier with suitable selective activation of the piezoelectric drive elements with electrical voltage pulses in the course of a line-wise movement of the write head. As a result of their activation with the voltage pulses, the tubular piezoelectric drive elements bring about a corresponding pulse-like contraction of the ink channels, by means of which pressure pulses are exerted on the ink present in the ink channels, which in turn is used to detach ink droplets at the nozzle openings of the ink channels and to transfer them to the recording medium to lead.
  • a disadvantage of the previously known writing heads of this type is that the distance between the nozzle openings and the recording medium cannot be increased arbitrarily and in the sense of the most accurate possible mosaic-like creation of characters may not exceed 0.5 to 1 mm.
  • One such application is, for example, the labeling of savings books in banking as part of an automatic booking process.
  • the page to be labeled can have a large or small distance from the print head or its nozzle openings. Within a distance range, which can then be up to 3 mm or more, the writing accuracy should always be constant.
  • the ink droplets are to be moved over a greater distance from the recording medium after they have emerged from the nozzle openings with constant accuracy, then the pressure pulses which cause them must be generated with greater intensity so that a linear flow of droplets is ensured.
  • the amplitude of the control voltage pulses applied to the piezoelectric drive elements can be increased, but such an increase has relatively low limits, which are probably due to the mechanical behavior of the drive elements themselves and do not lead to the desired success, but usually result in increased inaccuracies in writing.
  • the object of the invention is therefore to provide a design for a write head of the type mentioned at the beginning which makes it possible to produce recordings with satisfactory accuracy over larger distances than before, without having to accept impairments in the write accuracy due to excessive control voltage amplitudes.
  • each ink channel has a funnel-shaped extension which is immediately adjacent to this layer and is short in relation to the length of the individual ink channels.
  • a throttle plate and a close-meshed grating are provided between the ink channels and the ink space common to them as a filter arrangement, which is intended to prevent air from entering the ink space through the ink channels.
  • the throttle plate contains a very narrow through opening for each ink channel, which is intended to reduce pressure peaks in the ink supply system and to ensure a mutual decoupling of the pressure effects of the ink channels from one another.
  • each ink channel has a funnel-shaped extension adjacent to this layer. It has been shown that with this arrangement a considerably better utilization of the energy of the pressure pulses generated with the piezoelectric drive elements is possible, which leads to the fact that the ink droplets emerging at the nozzle openings can fly through a considerably greater distance to the recording medium while maintaining their predetermined path.
  • the filter material has a mesh width of approximately 0.035 mm and a thickness of approximately 0.05 mm. This dimensioning seems to ensure a particularly good capillary action of the filter material for the continuous supply of ink to the individual ink channels, combined with an adequate filter action.
  • Cutouts in the body containing the ink channels can be provided in various ways as funnel-shaped extensions of the ink channels.
  • an embodiment has proven to be particularly advantageous in which the extensions of the ink channels are conical with an opening angle of approximately 60 °.
  • the extensions are again advantageously dimensioned if they have a diameter of approximately 3 mm at their transition to the filter material. This dimension is then in a particularly favorable relationship to the diameter of the ink channels, which is usually in the order of magnitude of 0.5 to 0.7 mm at the mouth of the filter layer.
  • a write head according to the invention is shown schematically in a cross section as an exemplary embodiment.
  • This write head essentially consists of a plastic body 10, which is conical and is incorporated in the ink channels 11, which converge towards the left tip of the body 10 and open there with nozzle openings 12.
  • a recording medium 13 is arranged at a distance from the tip of the body 10, on which the ink droplets emerging from the nozzle openings 12 can record characters as a result of the mosaic-like distribution of the nozzle openings 12 when the body 10 and the recording medium move relative to one another.
  • the ink droplets are generated in that tubular piezoelectric drive elements 14, which surround the ink channels 11, are selectively driven in rapid succession with voltage pulses, as a result of which they deform in the manner of a contraction and generate a pressure pulse in the respective ink channel 11, which pulse occurs in the ink channel 11 existing ink affects so that the ink is detached at the nozzle openings 12 and shot onto the recording medium 13.
  • an ink supply system is provided, the reservoir of which is not shown in the figure.
  • the ink is supplied from such a reservoir at 15 to the print head and enters an ink space 16 common to all ink channels, which is formed between the body 10 and a rear end plate 17, which is in sealing connection with the body 10 and e.g. is screwed (not shown).
  • the common ink space 16 is so narrow that the ink supplied at 15 rises through it by capillary action and fills it up as a whole.
  • the width of the ink space 16 can be, for example, 0.1 to 0.3 mm.
  • the ink space 16 is delimited on its left side by a layer 18 of a filter material, which can consist, for example, of a fibrous plastic material with a mesh density of 0.035 mm.
  • the thickness of this layer 18 can be approximately 0.05 to 0.3 mm.
  • the individual ink channels 11 are more than twice as long as the drive elements 14 and are connected to the layer 18 of the filter material via a funnel-shaped extension 19, which is conical in the illustrated embodiment.
  • the opening angle of this funnel shape can e.g. Be 60 °.
  • the ink channels 11 can e.g. have a length of 35 mm, while the drive elements 14 are then about 12 mm long.
  • a pressure pulse is generated in the ink channel 11 within the ink filling it, which pressure pulse moves in the direction of the nozzle opening 12, but also in the opposite direction, namely to the layer 18 of the filter material there. reproduces.
  • the pressure pulse causes an ink droplet to detach at the nozzle opening 12 and to move it to the recording medium 13 there.
  • the enlargement 19 and the consequent increase in the flow cross-section of the filter material layer 18 results in a higher flow velocity of the ink compared to comparable known writing heads, which means that the recording medium 13 can have a correspondingly greater distance from the nozzle openings 12. In practice it has been shown that this distance can be of the order of 3 mm.
  • the piezoelectric drive elements 14 surround the ink channels 11 at a location which is arranged as close as possible to the extensions 19, while the remaining free length of the ink channels 11 lies in front of the drive elements 14.

Landscapes

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

Claims (6)

1. Tête d'écriture piézoélectrique pour des dispositifs d'impression par points d'encre, comportant plusieurs buses d'écriture sous la forme de canaux d'encre (11) recevant le liquide d'écriture, lesquels sont respectivement entourés par un élément de commande piézoélectrique (14) et sont reliés par l'intermédiaire d'un agencement de filtre avec le volume d'encre (16) qui leur est commun, les canaux d'encre ayant une longueur sensiblement plus grande que les éléments de commande, caractérisée en ce que l'agencement de filtre est constitué exclusivement par une couche (18) d'un matériau filtrant capillaire, et chaque canal d'encre (11) comporte un élargissement (19) en forme d'entonnoir immédiatement adjacent à cette couche (18) et de longueur inférieure à celle des canaux d'encre individuels.
2. Tête d'écriture selon la revendication 1, caractérisé en ce que le matériau filtrant (18) a une dimension de maille d'environ 0,035 mm et une épaisseur d'environ 0,05 mm.
3. Tête d'écriture selon la revendication 1 ou 2, caractérisée en ce que les élargissements (19) des canaux d'encre (11) sont réalisés en forme de tronc de cône avec un angle d'ouverture d'environ 60°.
4. Tête d'écriture selon la revendication 3, caractérisée en ce qu'à leur transition avec le matériau filtrant (18), les élargissements (19) ont un diamètre d'environ 3 mm.
5. Tête d'écriture selon l'une des
revendications précédentes, caractérisée en ce que le volume d'encre (16) est exclusivement rempli d'encre.
6. Tête d'écriture selon l'une des revendications précédentes, caractérisée en ce que les éléments de commande piézoélectriques (14) sont disposés au voisinage des élargissements (19) des canaux d'encre (11).
EP84103655A 1983-04-12 1984-04-03 Tête d'écriture commandée par piézo-électricité pour dispositifs d'écriture à mosaique d'encre Expired EP0121894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3313156A DE3313156A1 (de) 1983-04-12 1983-04-12 Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen
DE3313156 1983-04-12

Publications (3)

Publication Number Publication Date
EP0121894A2 EP0121894A2 (fr) 1984-10-17
EP0121894A3 EP0121894A3 (en) 1985-06-12
EP0121894B1 true EP0121894B1 (fr) 1986-10-15

Family

ID=6196124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103655A Expired EP0121894B1 (fr) 1983-04-12 1984-04-03 Tête d'écriture commandée par piézo-électricité pour dispositifs d'écriture à mosaique d'encre

Country Status (4)

Country Link
US (1) US4514743A (fr)
EP (1) EP0121894B1 (fr)
JP (1) JPS59198164A (fr)
DE (2) DE3313156A1 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405062A1 (de) * 1984-02-13 1985-08-22 Nixdorf Computer Ag, 4790 Paderborn Schreibkopf fuer tintenmosaikschreibeinrichtungen
US4877745A (en) * 1986-11-17 1989-10-31 Abbott Laboratories Apparatus and process for reagent fluid dispensing and printing
JP2656481B2 (ja) * 1987-02-13 1997-09-24 キヤノン株式会社 インクジエツト記録ヘツド
US4999652A (en) * 1987-12-21 1991-03-12 Hewlett-Packard Company Ink supply apparatus for rapidly coupling and decoupling a remote ink source to a disposable ink jet pen
US4831389A (en) * 1987-12-21 1989-05-16 Hewlett-Packard Company Off board ink supply system and process for operating an ink jet printer
US4864329A (en) * 1988-09-22 1989-09-05 Xerox Corporation Fluid handling device with filter and fabrication process therefor
US5121132A (en) * 1989-09-29 1992-06-09 Hewlett-Packard Company Ink delivery system for printers
DE69214481T2 (de) * 1991-02-20 1997-03-20 Canon Kk Tintenstrahlaufzeichnungskopf, Tintenstrahlaufzeichnungsvorrichtung diesen verwendend und Verfahren zu seiner Herstellung
KR970004231B1 (ko) * 1992-10-02 1997-03-26 캐논 가부시끼가이샤 잉크 공급기구, 이러한 기구를 구비한 잉크제트 카트리지 및 이러한 기구를 구비한 잉크제트 기록장치
US5610645A (en) * 1993-04-30 1997-03-11 Tektronix, Inc. Ink jet head with channel filter
US5742314A (en) * 1994-03-31 1998-04-21 Compaq Computer Corporation Ink jet printhead with built in filter structure
US6521187B1 (en) 1996-05-31 2003-02-18 Packard Instrument Company Dispensing liquid drops onto porous brittle substrates
US6203759B1 (en) 1996-05-31 2001-03-20 Packard Instrument Company Microvolume liquid handling system
US6537817B1 (en) 1993-05-31 2003-03-25 Packard Instrument Company Piezoelectric-drop-on-demand technology
DE69518191T2 (de) * 1994-05-20 2001-05-31 Canon Kk Tintenversorgungsvorrichtung und zugehöriges Tintenstrahlaufzeichnungsgerät
US5734399A (en) * 1995-07-11 1998-03-31 Hewlett-Packard Company Particle tolerant inkjet printhead architecture
JPH0966603A (ja) * 1995-08-31 1997-03-11 Brother Ind Ltd インク噴射装置の駆動方法
US6083762A (en) * 1996-05-31 2000-07-04 Packard Instruments Company Microvolume liquid handling system
US20030215957A1 (en) * 1998-02-20 2003-11-20 Tony Lemmo Multi-channel dispensing system
NL1011127C2 (nl) * 1999-01-25 2000-07-27 Oce Tech Bv Inrichting voor het afgeven van inkt.
EP1204533B1 (fr) 1999-06-30 2005-04-06 Silverbrook Research Pty. Limited Structure et ensemble support de tete d'impression

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2164113C3 (de) * 1971-12-23 1975-03-27 Olympia Werke Ag, 2940 Wilhelmshaven Tintenspritzkopf, insbesondere für ein Tintenspritzschreibwerk
DE2460573A1 (de) * 1974-12-20 1976-07-01 Siemens Ag Vorrichtung fuer tintenstrahlschreiber zur versorgung von piezoelektrisch betriebenen schreibduesen mit schreibfluessigkeit
DE2543451C2 (de) * 1975-09-29 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Piezoelektrisch betriebener Schreibkopf für Tintenmosaikschreibeinrichtungen
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
DE2543420C3 (de) * 1975-09-29 1980-09-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Piezoelektrisches Antriebselement für Schreibköpfe in Tintenmosaik-Schreibeinrichtungen
DE2543397C3 (de) * 1975-09-29 1982-07-15 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum Dämpfen von Flüssigkeitsschwingungen in Tintenversorgungssystemen von Tintenmosaikschreibeinrichtungen
JPS55158980A (en) * 1979-05-29 1980-12-10 Seiko Epson Corp Ink jet recording head
US4233610A (en) * 1979-06-18 1980-11-11 Xerox Corporation Hydrodynamically damped pressure pulse droplet ejector
DE3006726C2 (de) * 1980-02-22 1982-03-11 Siemens AG, 1000 Berlin und 8000 München Tintenschreibeinrichtung
JPS5715975A (en) * 1980-07-04 1982-01-27 Hitachi Ltd Ink jet recorder
DE3123689A1 (de) * 1981-06-15 1982-12-30 Siemens AG, 1000 Berlin und 8000 München Schreibkopf fuer tintenschreibeinrichtungen
JPS581569A (ja) * 1981-06-29 1983-01-06 Canon Inc 液体噴射記録ヘツド
JPS5859857A (ja) * 1981-10-07 1983-04-09 Nec Corp インクジエツト式印字ヘツド

Also Published As

Publication number Publication date
JPS59198164A (ja) 1984-11-09
DE3313156A1 (de) 1984-10-18
EP0121894A3 (en) 1985-06-12
DE3460948D1 (en) 1986-11-20
EP0121894A2 (fr) 1984-10-17
US4514743A (en) 1985-04-30

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