EP0063637B1 - Ink jet recording head with cylindrical ink channels - Google Patents

Ink jet recording head with cylindrical ink channels Download PDF

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Publication number
EP0063637B1
EP0063637B1 EP19810108327 EP81108327A EP0063637B1 EP 0063637 B1 EP0063637 B1 EP 0063637B1 EP 19810108327 EP19810108327 EP 19810108327 EP 81108327 A EP81108327 A EP 81108327A EP 0063637 B1 EP0063637 B1 EP 0063637B1
Authority
EP
Grant status
Grant
Patent type
Prior art keywords
recording head
ink
channel plate
head
characterised
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
EP19810108327
Other languages
German (de)
French (fr)
Other versions
EP0063637A3 (en )
EP0063637A2 (en )
Inventor
Erich Ing. Kattner
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
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2/1429Structure of print heads with piezoelectric elements of tubular type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2002/14379Edge shooter

Description

  • Die Erfindung betrifft einen Schreibkopf für Tintenschreibeinrichtungen mit im Schreibkopf verlaufenden, zylinderförmigen von Piezowandlern teilweise umfaßten Tintenkanälen. The invention relates to a write head for ink writing devices with extending in the write head, the cylindrical piezo transducers partially covered ink channels.
  • Für Tintenschreibeinrichtungen mit einem Mehrfachdüsenschreibkopf ist es bekannt (DE-OS 2543451), die teilweise von piezokeramischen Antriebselementen zylinderförmig umfaßten Tintenkanäle im Schreibkopf von der Abdruckstelle strahlenförmig und knickfrei wegfluchtend verlaufend anzuordnen. For ink writing devices having a multi-nozzle print head, it is known (DE-OS 2543451), which partly of piezoceramic drive elements cylindrical included to arrange the ink channels in the print head from the print position radially and kinks wegfluchtend running. Ein solcher Schreibkopf kann durch Vergießen der Antriebselemente bei gleichzeitiger Ausformung der Tintenkanäle hergestellt werden. Such a recording head can be produced by casting the drive elements during simultaneous formation of the ink channels. Das geschieht dadurch, daß in eine Gießform Führungsnadeln und die Antriebselemente eingelegt werden. This is achieved in that guide pins and the drive elements are inserted into a mold. Die Nadeln werden nach dem Ausgießen wieder herausgezogen, so daß die Tintenkanäle als zylinderförmig verlaufende Hohlräume im Inneren des Kopfes entstehen. The needles are pulled out again after the pouring, so that the ink channels are formed as cylindrical cavities extending in the interior of the head. Nachteilig ist dabei, daß dabei sehr hohe Toleranzanforderungen eingehalten werden müssen. The disadvantage is that this very high tolerance requirements must be met. Weiterhin kann das Einlegen und das Herausziehen der Nadeln nur manuell durchgeführt werden, was den Fertigungsaufwand beträchtlich erhöht. Furthermore, the insertion and withdrawal of the needles can be carried out manually, which increases the manufacturing costs considerably.
  • Schließlich besteht ein weiteres Problem darin, daß bei einer Anordnung mit die Tintenkanäle zylinderförmig umfassenden röhrchenförmigen Piezowandlern als Antriebselemente wegen der an der Austrittsstelle der Tintenkanäle erforderlichen engen Teilung die Antriebselemente erst im hinteren Bereich der Tintenkanäle angeordnet sein können, was zu einer Verlängerung des gesamten Kopfes führt. Finally, there is another problem in that in an arrangement of the drive elements with the ink channels cylindrical comprehensive tubular piezoelectric transducers as the drive elements due to the required at the exit point of the ink channels narrow division only in the rear region of the ink channels may be arranged, which leads to an extension of the entire head ,
  • Aufgabe der Erfindung ist es, einen Schreibkopf für Tintenschreibeinrichtungen der oben angegebenen Art zu schaffen, für den die Toleranzanforderungen reduziert sind, bei dessen Herstellung der bisher erforderliche hohe Anteil an manueller Tätigkeit entfallen kann, und der schließlich zumindest in seinen Längsabmessungen kleiner gemacht werden kann. The object of the invention is to provide a writing head for ink writing devices of the type indicated above, for which the tolerance requirements are reduced during its production of the previously required high proportion of manual work can be omitted, and which can be finally made smaller at least in its longitudinal dimensions. Ein Schreibkopf, mit dem diese Aufgabe gelöst wird, ist durch die Merkmale des Anspruches 1 gekennzeichnet. A write head with which this object is achieved is characterized by the features of claim 1.
  • Ein wesentlicher Vorteil der vorgeschlagenen Anordnung besteht darin, daß der Hohlraum, der einen Tintenkanal bildet, aus mehreren Teilen besteht, die jeweils getrennt herstellbaren Teilen zugeordnet sind. An essential advantage of the proposed arrangement is that the cavity, forming an ink channel consists of several parts, which are assigned in each case separately produced parts. Das gestattet es, den durch Vergießen hergestellten Kopfteil mit den parallel zueinander verlaufenden Tintenkanälen ohne die bisher einzuhaltenden Toleranzanforderungen maschinell herzustellen. This makes it possible to machine the head part produced by molding with the mutually parallel ink channels to be maintained without the previously tolerance requirements. Lediglich die Kanalplatte und die Düsenplatte, stellen Präzisionsteile dar. In besonders vorteilhafter Weise können diese nach einem galvanoplastischem Verfahren oder nach einem fotokeramischen Verfahren mit beliebiger Genauigkeit erstellt werden. Only the channel plate and the nozzle plate, precision parts represent. In a particularly advantageous manner, this can be created for a galvanoplastic method or a photo-ceramic process with any degree of accuracy. Ein weiterer Vorteil besteht darin, daß die Antriebselemente nunmehr unmittelbar am Austrittsende der Tintenkanäle im Kopfteil oder doch in deren unmittelbaren Nähe angeordnet werden können. A further advantage is that the drive elements can be arranged in the immediate vicinity thereof now directly at the exit end of the ink passages in the head part, or at least. Damit ist eine deutliche Verkürzung der Gesamtlänge des Schreibkopfes verbunden, was sich im Endeffekt in einer erwünschten Verkleinerung eines mit solchen Schreibköpfen bestückten Druckwerkes auswirkt. Thereby significantly shortening the overall length of the write head is connected, which affects in the end in a desired reduction of a populated with such write heads printing unit.
  • In Ausgestaltung der Erfindung besteht das Befestigungselement aus einem Bügel, dessen Arme federnd ausgebildet sind, und die über die einzelnen Teile des Schreibkopfes hinweggreifend die erforderliche Andruckskraft für einen dichtenden Zusammenhalt der einzelnen Teile liefern. In an embodiment of the invention, the fastening element consists of a bracket, the arms of which are resilient, and away across the supply of the individual parts of the write head the required pressing force for sealing together of the individual parts.
  • Weitere Einzelheiten der Erfindung werden im folgenden anhand eines in der Zeichnung dargestellten Ausführungsbeispieles gegeben. Further details of the invention are given below by way of illustrated in the drawings embodiment.
  • Dieses zeigt einen Schreibkopf 1, der sieben parallel verlaufende Tintenkanäle 2 enthält. This shows a writing head 1, which contains seven parallel ink channels. 2 Jedem Tintenkanal 2 ist ein Piezowandler in Form eines, den Tintenkanal umfassenden Piezoröhrchens 3 zugeordnet. Each ink channel 2 is assigned a piezoelectric transducer in the form of the ink channel comprising piezo-tube. 3 Im Beispiel sind die Tintenkanäle 2 in zwei zueinander versetzt liegenden Reihen angeordnet. In the example, the ink passages 2 are arranged in two mutually offset rows. Eine sich unmittelbar an den Kopfteil 1 anschließende Kanalplatte 4, weist entsprechend der Anzahl der Tintenkanäle sieben Tintenführungskanäle 5 auf, in die auf der dem Kopfteil zugewandten Seite die Tintenkanäle 2 einmünden, und die auf der anderen Seite Austrittsöffnungen 6 besitzen. A directly adjoining the head part 1 channel plate 4, corresponding to the number of the ink channels seven ink guide passages 5, into which on the side facing the head part side open out the ink passages 2, and have the on the other side outlet openings. 6 Die Austrittsöffnungen 6 sind dabei in der für die Austrittsdüsen vorgesehenen Reihe angeordnet. The outlet openings 6 are arranged in the manner provided for the outlet nozzle row. Im Ausführungsbeispiel bilden sie eine übereinanderliegende Reihe von Öffnungen. In the embodiment, they form a superimposed series of openings. Es ist jedoch auch eine andere Form möglich. However, it is possible also another form.
  • Als dichtende Abdeckung nach außen und zur Gewährleistung eines exakten Tröpfchenausstosses ist die Düsenplatte 7 mit den Düsenöffnungen 8 vorhanden. As a sealing cover to the outside and to ensure a precise droplet ejection, the nozzle plate 7 is provided with the nozzle openings. 8 Die Düsenöffnungen 8 entsprechend sowohl in ihrer Lage als auch in ihrer Anzahl den Austrittsöffnungen 6 der Kanalplatte 4. The nozzle openings 8 corresponding to both in position and in number to the outlet openings 6 of the channel plate. 4
  • Zur sichernden Befestigung der einzelnen Teile, nämlich des Kopfteiles 1, der Kanalplatte 4 und der Düsenplatte 7, dient ein Bügel 9, dessen federnde Arme 10 nach dem Zusammenfügen der einzelnen Teile über diese hinweggreifen und in Ausnehmungen 11 des Kopfteiles 1 einrastend befestigt werden. In order to secure fastening of the different parts, namely the head portion 1, the channel plate 4 and the nozzle plate 7, a bracket 9, the resilient arms will snap 10 is fixed after assembly of the individual parts thereacross access and in recesses 11 of the head portion 1 is used. Es ist vorteilhaft, wenn der Bügel 9 den größten Teil der Außenfläche der Düsenplatte 7 abdeckt und nur im Bereich der Austrittsöffnungen 8 eine entsprechende Aussparung 12 aufweist. It is advantageous when the bracket 9 covering most of the outer surface of the nozzle plate 7 and a corresponding recess 12 only in the region of the outlet openings. 8 Damit wird eine Erhöhung der Andruckkraft und damit eine bessere Abdichtung zwischen den einzelnen Teilen des Schreibkopfes erreicht. Thus increasing the contact pressure and thus a better seal between the individual parts of the recording head is achieved. Bedarfsweise kann, was hier nicht dargestellt ist, zur Verbesserung der Abdichtung zwischen den einzelnen Teilen des Schreibkopfes eine mit entsprechenden Öffnungen versehene Abdichtfolie eingelegt sein. If necessary, however, which is not shown here, to be inserted to improve the sealing between the individual parts of the writing head a sealing film provided with corresponding openings.
  • Da die für Tintenschreibeinrichtungen geforderte und die Schriftqualität bestimmende Präzision im wesentlichen durch die exakte Einhaltung sehr enger Toleranzanforderungen für die Ausbildung der Tintenaustrittsöffnungen bestimmt wird, diese bei der neuen Anordnung aber in der Kanalplatte liegen, sind die Toleranzanforderungen, die an den Kopfteil gerichtet werden, geringer. Since the required ink writing devices and the writing quality-determining precision essentially by strict adherence to tolerance requirements is determined for the formation of the ink discharge openings very narrow, but these are in the new arrangement in the channel plate, the tolerance requirements that are addressed to the headboard, low , Dieser kann somit beispielsweise durch maschinelles Vergießen erstellt werden. This can thus be created for example by casting machine. In diesem Zusammenhang ist es auch von Bedeutung, daß dei Tintenkanäle im Kopfteil in ihrem Durchmesser konstant sind, also sich z. In this context it is also important that dei ink channels are constant in the header in diameter, so for example. B. nicht verjüngen, was das Einfädeln von Führungsnadeln vor dem Vergießen bzw. das Herausziehen der Führungsnadein nach dem Vergießen erheblich erleichtern. do not taper as what the threading of guide needles prior to casting or extraction of the Führungsnadein after molding much easier.

Claims (5)

1. A recording head for ink jet printers, having cylindrical ink channels provided in the recording head which are at least partially embraced by piezotransducers, characterised
by a head part (1) in which the ink channels (2) are arranged parallel to one another ;
by an adjoining channel plate (4) having ink guidance channels (5) into which the ink channels (2) open on one side of the channel plate (4) and which, on the other side, form outlet openings (6) ;
by a nozzle plate (7) provided with nozzle openings (8) which are assigned to the outlet openings (6) of the channel plate (4) ; and by a fixing element (9) which at least partially embraces the head part (1), the channel plate (4), and the nozzle plate (7).
2. A recording head as claimed in Claim 1, characterised in that the head part (1), together with the ink channels (2) and the drive elements (3), is a synthetic resin part produced by moulding.
3. A recording head as claimed in Claim 1, characterised in that the channel plate (4) is a galvanoplastically produced component.
4. A recording head as claimed in Claim 1, characterised in that the channel plate (4) is a photoceramically produced component.
5. A recording head as claimed in one of Claims 1 to 4, characterised in that the fixing element (9) consists of a bracket provided with spring-like attachments (10) which engage over the nozzle plate (7) and the channel plate (4) so that they can be snapped into recesses (11) in the head part (1).
EP19810108327 1981-04-29 1981-10-14 Ink jet recording head with cylindrical ink channels Expired EP0063637B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3117028 1981-04-29
DE19813117028 DE3117028A1 (en) 1981-04-29 1981-04-29 Write head for ink writing devices with zylinderfoermigen tintenkanaelen

Publications (3)

Publication Number Publication Date
EP0063637A2 true EP0063637A2 (en) 1982-11-03
EP0063637A3 true EP0063637A3 (en) 1983-08-24
EP0063637B1 true EP0063637B1 (en) 1985-03-13

Family

ID=6131102

Family Applications (1)

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EP19810108327 Expired EP0063637B1 (en) 1981-04-29 1981-10-14 Ink jet recording head with cylindrical ink channels

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EP (1) EP0063637B1 (en)
JP (1) JPS57182454A (en)
DE (1) DE3117028A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3630206A1 (en) * 1985-09-06 1987-03-19 Fuji Electric Co Ltd Inkjet printhead

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665409A (en) * 1984-11-29 1987-05-12 Siemens Aktiengesellschaft Write head for ink printer devices
US4680595A (en) * 1985-11-06 1987-07-14 Pitney Bowes Inc. Impulse ink jet print head and method of making same
US4771298A (en) * 1986-09-17 1988-09-13 International Business Machine Corporation Drop-on-demand print head using gasket fan-in
DE68927716D1 (en) * 1988-10-31 1997-03-06 Canon Kk Liquid jet recording head and equipped with this head unit
EP0383019B1 (en) * 1989-01-13 1997-11-05 Canon Kabushiki Kaisha Ink jet recording head, ink jet recording apparatus and wiping method therefor
US5185615A (en) * 1990-04-11 1993-02-09 Canon Kabushiki Kaisha Ink jet recording method and apparatus for recovering ejection at a particular orifice by ejecting ink from adjacent orifices
DE4100730C2 (en) * 1991-01-09 1997-04-03 Francotyp Postalia Gmbh A method for a liquid jet printing apparatus
JP2833875B2 (en) * 1991-04-16 1998-12-09 キヤノン株式会社 Method of manufacturing an ink jet head, and a manufacturing machine
DE4336416A1 (en) * 1993-10-19 1995-08-24 Francotyp Postalia Gmbh Face-shooter ink jet printhead and method for its preparation
DE4424771C1 (en) * 1994-07-05 1995-11-23 Francotyp Postalia Gmbh Ink jet print head of individual ink print modules
US6435648B1 (en) * 1996-02-13 2002-08-20 Canon Kabushiki Kaisha Liquid ejection apparatus using air flow to remove mist

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543420C3 (en) * 1975-09-29 1980-09-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen
DE2728657A1 (en) * 1977-06-24 1979-01-04 Siemens Ag Duesenplatte for ink writing devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3630206A1 (en) * 1985-09-06 1987-03-19 Fuji Electric Co Ltd Inkjet printhead

Also Published As

Publication number Publication date Type
DE3117028A1 (en) 1982-11-18 application
JPS57182454A (en) 1982-11-10 application
EP0063637A3 (en) 1983-08-24 application
EP0063637A2 (en) 1982-11-03 application

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