EP0040784A2 - Agencement pour une tête d'impression dans un dispositif à écrire à jets d'encre en forme de matrice de points - Google Patents

Agencement pour une tête d'impression dans un dispositif à écrire à jets d'encre en forme de matrice de points Download PDF

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Publication number
EP0040784A2
EP0040784A2 EP81103805A EP81103805A EP0040784A2 EP 0040784 A2 EP0040784 A2 EP 0040784A2 EP 81103805 A EP81103805 A EP 81103805A EP 81103805 A EP81103805 A EP 81103805A EP 0040784 A2 EP0040784 A2 EP 0040784A2
Authority
EP
European Patent Office
Prior art keywords
ink channels
ink
wedge
arrangement
impression point
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.)
Ceased
Application number
EP81103805A
Other languages
German (de)
English (en)
Other versions
EP0040784A3 (fr
Inventor
Joachim Prof. Dr. Heinzl
Erich Kattner
Günter Dipl.-Ing. Rosenstock
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
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0040784A2 publication Critical patent/EP0040784A2/fr
Publication of EP0040784A3 publication Critical patent/EP0040784A3/fr
Ceased 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
    • B41J2/14—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
    • 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
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing

Definitions

  • the invention relates to an arrangement for a print head in ink mosaic writing devices with a plurality of ink channels running in the write head and approaching one another in the direction of the impression point.
  • Ink mosaic writing devices are known in which the ink droplets are sprayed from a plurality of nozzles against a recording medium and form a raster-shaped symbol thereon (DE-OS 25 43 457).
  • Cylindrical tubes are used as nozzles or ink channels, which are connected on one side to a writing fluid reservoir and on the other side end at an outlet opening in front of the impression point. If necessary, a nozzle plate can be provided as an additional end part.
  • the ink ejection is controlled by piezoelectric drive elements which can be controlled individually, thereby generating a shock wave in the interior of the ink channel and causing the ejection of a defined ink droplet.
  • the font quality that can be achieved in this way does not always meet the desired requirements due to the fact that the ink channels at the impression point or on the nozzle plate are not close enough to be rewarded.
  • a reduction in the distance between the ink channels in this area due to the use of thinner ink channels reaches both technological and manufacturing limits.
  • high flow losses occur inside, which leads to an increase in the voltages required for the operation of the drive elements.
  • the invention has for its object to provide an arrangement for printheads in ink mosaic devices, which allows a narrower division of the ink channels in the area of the impression and thus a higher resolution without known influences, without affecting the flow properties.
  • the ink channels have a wedge-shaped taper at their end facing the impression point, and in that the outlet openings are each arranged in the mouth slot of the wedge-shaped taper. This advantageously results in the possibility of refining the division by at least twice with the same minimum wall thickness between the individual ink channels.
  • the ink channels can be arranged such that their mouth slots in the area of the impression point are parallel to the latter and the outlet openings form a row.
  • Another arrangement is characterized in that the ink channels are arranged in at least two planes in such a way that their orifices form at least two rows which are offset with respect to one another and lie parallel to the latter in the region of the impression point.
  • the wedge-shaped tapering of the ink channels can be chamfered at their front end according to a further embodiment of the invention.
  • the ink channel 1 shown in FIG. 1 has a wedge-shaped taper 2 at its front end facing the impression point, which ends with an orifice slot 3. In this there is the outlet opening 4.
  • This design makes it possible to keep the cross section of the ink channel 1 as large as possible and above all constant up to close to the impression point, as a result of which the flow losses remain low.
  • the height of the ink channel 1 at its front end is only limited by the division and the minimum wall thickness of the partition between the channels.
  • the width of the ink channel can be selected in accordance with the tools, for example needles, provided in the print head for producing the ink channels.
  • the wedge-shaped taper can lead to the formation of empty spaces in the area of the impression, for example between the outlet openings and the nozzle plate, in which air bubbles can accumulate. This has a disruptive effect on the function of the write head in that these air bubbles dampen the pressure wave inside the ink channels and adversely affect or prevent the ejection of ink droplets. This can be avoided by the fact that, as shown in FIGS. 2 and 3, the wedge-shaped taper 2 is chamfered at its front end.
  • the bevel can be applied on both sides (bevel 5 in FIG. 2) or only on one side (bevel 6 in FIG. 3). Possibly. accumulated air bubbles can now escape through the outlet opening 4.
  • FIGS. 4 and 5 show an example of the arrangement of 24 ink channels in a write head.
  • the total of 24 ink channels 1 running in the write head 7, which are each tapered in a wedge shape, are arranged here in four planes, the orifice slots 3 of the 24 ink channels form two rows and are offset from each other.
  • the outlet openings 4 form two rows.
  • the invention is not limited to the exemplary embodiment according to FIGS. 4 and 5. Rather, it is within the scope of the invention to arrange the ink channels in more or fewer planes and the orifice slots in more or fewer rows.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP81103805A 1980-05-23 1981-05-18 Agencement pour une tête d'impression dans un dispositif à écrire à jets d'encre en forme de matrice de points Ceased EP0040784A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3019822 1980-05-23
DE19803019822 DE3019822A1 (de) 1980-05-23 1980-05-23 Anordnung fuer einen schreibkopf in tintenmosaikschreibeinrichtungen

Publications (2)

Publication Number Publication Date
EP0040784A2 true EP0040784A2 (fr) 1981-12-02
EP0040784A3 EP0040784A3 (fr) 1982-04-14

Family

ID=6103193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81103805A Ceased EP0040784A3 (fr) 1980-05-23 1981-05-18 Agencement pour une tête d'impression dans un dispositif à écrire à jets d'encre en forme de matrice de points

Country Status (5)

Country Link
US (1) US4368477A (fr)
EP (1) EP0040784A3 (fr)
JP (1) JPS5724264A (fr)
CA (1) CA1160905A (fr)
DE (1) DE3019822A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1144625B (it) * 1981-08-04 1986-10-29 Olivetti & Co Spa Stampante a punti a getto d inchiostro
DE3234408C2 (de) * 1982-09-16 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Schreibkopf mit piezoelektrischen Antriebselementen für Tintenschreibeinrichtungen
DE3477902D1 (en) * 1984-05-16 1989-06-01 Siemens Ag Arrangement for the fixing and the connecting of piezoelectrical drive elements in the print head of an ink jet printer
DE3480183D1 (en) * 1984-05-18 1989-11-23 Siemens Ag Device for fastening and contacting for cylindrical piezo-electrical transducers
JPS62140851A (ja) * 1985-12-17 1987-06-24 Canon Inc インクジエツト記録ヘツド
US5172141A (en) * 1985-12-17 1992-12-15 Canon Kabushiki Kaisha Ink jet recording head using a piezoelectric element having an asymmetrical electric field applied thereto
US5751317A (en) * 1996-04-15 1998-05-12 Xerox Corporation Thermal ink-jet printhead with an optimized fluid flow channel in each ejector
US5901425A (en) * 1996-08-27 1999-05-11 Topaz Technologies Inc. Inkjet print head apparatus
US5782184A (en) * 1997-03-12 1998-07-21 Raster Graphics, Incorporated Printer head carriage and method for aligning printer heads on a printer head carriage
EP0873871A3 (fr) 1997-03-27 1999-08-18 Xerox Corporation Tête d'impression à jet d'encre thermique adaptée aux encres visqueuses
US6955417B2 (en) * 2002-03-28 2005-10-18 Fuji Photo Film Co., Ltd. Inkjet recording head and inkjet printer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH519991A (fr) * 1971-01-06 1972-03-15 Paillard Sa Dispositif d'alimentation d'une buse d'émission dans un procédé d'écriture par jet d'encre
DE2543451A1 (de) * 1975-09-29 1977-03-31 Siemens Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946398A (en) * 1970-06-29 1976-03-23 Silonics, Inc. Method and apparatus for recording with writing fluids and drop projection means therefor
US3958255A (en) * 1974-12-31 1976-05-18 International Business Machines Corporation Ink jet nozzle structure
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
DE2607313C3 (de) * 1976-02-23 1979-01-25 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schutz- und Reinigungsvorrichtung für Schreibköpfe in Tintenschreibeinrichtungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH519991A (fr) * 1971-01-06 1972-03-15 Paillard Sa Dispositif d'alimentation d'une buse d'émission dans un procédé d'écriture par jet d'encre
DE2543451A1 (de) * 1975-09-29 1977-03-31 Siemens Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen

Also Published As

Publication number Publication date
US4368477A (en) 1983-01-11
CA1160905A (fr) 1984-01-24
DE3019822A1 (de) 1981-12-03
EP0040784A3 (fr) 1982-04-14
JPS5724264A (en) 1982-02-08

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19811028

PUAL Search report despatched

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Effective date: 19840521

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HEINZL, JOACHIM, PROF. DR.

Inventor name: ROSENSTOCK, GUENTER, DIPL.-ING.

Inventor name: KATTNER, ERICH