EP0401216B1 - Dispositif de chauffage de l'encre dans la tete d'ecriture d'une machine d'impression a l'encre - Google Patents

Dispositif de chauffage de l'encre dans la tete d'ecriture d'une machine d'impression a l'encre Download PDF

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Publication number
EP0401216B1
EP0401216B1 EP88905666A EP88905666A EP0401216B1 EP 0401216 B1 EP0401216 B1 EP 0401216B1 EP 88905666 A EP88905666 A EP 88905666A EP 88905666 A EP88905666 A EP 88905666A EP 0401216 B1 EP0401216 B1 EP 0401216B1
Authority
EP
European Patent Office
Prior art keywords
ink
heating
heating element
printer head
printer
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
EP88905666A
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German (de)
English (en)
Other versions
EP0401216A1 (fr
Inventor
Ernst Goepel
Rudolf Schierjott
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 EP0401216A1 publication Critical patent/EP0401216A1/fr
Application granted granted Critical
Publication of EP0401216B1 publication Critical patent/EP0401216B1/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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/195—Ink jet characterised by ink handling for monitoring ink quality

Definitions

  • the invention relates to a heating device for heating the ink in the print head of an ink printing device according to the preamble of patent claim 1.
  • a known principle for the representation of characters on a recording medium is based on the fact that under the action of a control individual ink droplets are ejected from nozzles of a writing head which is part of an ink printing device. By coordinating the ejection of individual droplets and the relative movement between the recording medium and the writing head, characters and / or graphic patterns are thereby built up in a grid pattern on the recording medium.
  • the operational reliability and the quality of the recording depend to a large extent on the uniformity of the droplet ejection, ie the individual droplets ejected by a drive pulse must have a defined size and leave the nozzle of the print head at the same speed in each case.
  • the temperature of the ink in the print head can be brought to a certain value and maintained.
  • relatively long heating-up times result, in particular in the case of writing heads with electrothermal transducers, since the heating elements are arranged on the surface of a writing head carrier which is relatively voluminous or has a large area.
  • the write head is usually arranged on an aluminum plate, which serves as a heat sink. If the ink has to be heated when switching on, when operating with a few nozzles or after a long writing operation of the ink printing device, then the heat sink must also be heated up.
  • the object of the invention is to provide an arrangement for heating or heating the ink for a print head in ink printing devices according to the preamble, with which the heating time is reduced, with which a reliable control is ensured, which furthermore only takes up little space for heating and if necessary requires sensor elements and can be assembled with little effort.
  • FIG. 1 shows only the details necessary for understanding the invention, namely a write head 1 with outlet nozzles 2, from which by individual control of electrothermal transducer elements, each of which acts on the ink in the ink channels 3, individual ink droplets are expelled.
  • the now generally known principle for this is based on the fact that a controlled heating of the electrothermal transducer element in the ink channel in question results in an ink vapor bubble (so-called bubble) which causes droplet ejection. This principle has therefore become known as the bubble jet process.
  • the individual ink channels 3 are connected to a common ink chamber 4.
  • Such write heads can be constructed using what is known as thin-film technology, the electrothermal transducer, generally a heating resistor, and the contacts for this heating resistor being built up in layers on a substrate carrier, with the ink chamber 4 and the ink channels 3 being formed at the same time.
  • the writing head 1 is arranged on a relatively large-area writing head carrier 5 which acts as a heat sink. This is usually made of aluminum.
  • the heating element 6 provided for heating the ink, like the sensor element 7, is arranged on the print head carrier 5.
  • a so-called voltage regulator is used as the heating element 6 and its power loss is used as heating power for heating the write head carrier 5.
  • Voltage regulators are known per se.
  • an integrated circuit is preferred, in which a thermal overload protection is included, which protects the circuit, like the overall arrangement, from destruction or erosion.
  • a sensor element 7 is also advantageously used as such known PTC thermistor use.
  • the application of the heating element and the sensor element on the print head carrier 5 does not present any design problems.
  • a control circuit 8 which is connected to the heating element 6 and the sensor element 7 via the connections 9, the heating-up times for the ink are significantly shorter than with PTC heating elements according to the prior art.
  • the control circuit 8 given as an example essentially consists of a first voltage divider with the fixed resistors 10 and 11, a second voltage divider which, in addition to a fixed resistor 12, contains the sensor element 7 as a further resistor, a differential amplifier 13, the inputs of which are tapped with the first and the second voltage divider are connected and from a transistor output stage 14 and a variable resistor 15, with which the load current IL of the heating element 6 is set.
  • Other components (resistors and capacitances) of the control circuit 8 are not identified in detail.
  • the response threshold of the control circuit 8 is adjustable via the resistor 12 in cooperation with the sensor element 7. When the predetermined operating temperature Tb is reached, the output transistor is switched off via the output of the differential amplifier 13.
  • the voltage regulator as the heating element 6 a heating power of up to 25 W can be achieved.
  • the housing of such a voltage regulator has a very low heat transfer resistance, which also has a very favorable effect on reducing the heating-up time.
  • Line 1 shows the course of the load current IL and row 2 shows the course of the temperature T as a function of the time t.
  • the arrangement can advantageously be used in ink writing devices with a plurality of writing heads, for example in so-called multicolor writing devices. Since the heating element used according to the invention can deliver a large heating power and itself has only a low thermal resistance, it can be on the common one together with the sensor element Print head carriers for the print heads can be arranged. This has the advantage that a single heating element is sufficient to heat the ink of a large number of writing heads and that only a single control circuit has to be provided.
  • FIG. 3 An example of this embodiment is shown in FIG. 3.
  • the writing device consists of four writing heads 16 to 19, for which a common writing head support 20, which in turn can be an aluminum support, is provided as a heat sink.
  • the heating element 6 and the sensor element 7 are arranged on this.
  • FIG. 3 shows a sectional illustration, ie the ink channels 21 in each of the write heads 16 to 19 lie here in the plane of the drawing.
  • the control circuit 8 described with reference to FIG. 1 is used, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)

Abstract

Le dispositif de chauffage comprend un capteur (7) de température et un régulateur de tension qui sert d'élément de chauffage (6) et qui est agencé sur le support (5) de la tête d'écriture. L'élément de chauffage (6) est alimenté par un circuit de réglage (8) en un courant de charge (IL) constant jusqu'à ce qu'une température réglable de fonctionnement (Tb) soit atteinte; l'énergie thermique de chauffage de l'encre est fournie par la chaleur perdue de l'élément de chauffage (6).

Claims (3)

  1. Dispositif pour chauffer l'encre dans la tête d'écriture d'un dispositif d'écriture à encre, comportant plusieurs canaux d'encre (3) se terminant par des ouvertures de sortie (2), et des éléments transducteurs électrothermiques associés à chaque canal d'encre et individuellement commandables, sous l'action desquels l'encre dans la zone d'un élément transducteur dans le canal d'encre est brusquement chauffée jusqu'à former une bulle de vapeur d'encre, la tête d'écriture (1,16-19) étant agencée sur un support (5,20) de tête d'écriture présentant une grande surface par rapport à la tête d'écriture, un élément de chauffage supplémentaire (6) dont la puissance dissipée chauffe le support (5,20) de la tête d'écriture et l'encre dans la tête d'écriture à la température de service (Tb), un capteur de température (7), et un circuit de réglage (8),
    caractérisé en ce que l'élément de chauffage supplémentaire (6) est un régulateur de tension qui est agencé de façon thermiquement conductrice sur le support (5,20) de la tête d'écriture, en même temps que le capteur de température (7), et en ce que, par l'intermédiaire du circuit de réglage (8), l'élément de chauffage (6) est alimenté par un courant de charge constant (IL) jusqu'à atteindre la température de service (Tb).
  2. Dispositif de chauffage selon la revendication 1,
    caractérisé en ce que l'élément de chauffage (6) est agencé dans un boîtier présentant une faible valeur de résistance de transfert thermique.
  3. Dispositif de chauffage selon les revendications 1 et 2 pour un dispositif d'impression à encre comportant plusieurs têtes d'écriture,
    caractérisé en ce que l'élément de chauffage (6) et le capteur de température (7) sont agencés sur le support (20) commun pour toutes les têtes d'écriture (16 à 19), et sont reliés au circuit de réglage commun (8).
EP88905666A 1988-06-29 1988-06-29 Dispositif de chauffage de l'encre dans la tete d'ecriture d'une machine d'impression a l'encre Expired - Lifetime EP0401216B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1988/000392 WO1990000115A1 (fr) 1988-06-29 1988-06-29 Dispositif de chauffage de l'encre dans la tete d'ecriture d'une machine d'impression a l'encre

Publications (2)

Publication Number Publication Date
EP0401216A1 EP0401216A1 (fr) 1990-12-12
EP0401216B1 true EP0401216B1 (fr) 1993-04-28

Family

ID=6819557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88905666A Expired - Lifetime EP0401216B1 (fr) 1988-06-29 1988-06-29 Dispositif de chauffage de l'encre dans la tete d'ecriture d'une machine d'impression a l'encre

Country Status (5)

Country Link
US (1) US5182578A (fr)
EP (1) EP0401216B1 (fr)
JP (1) JPH03505431A (fr)
DE (1) DE3880693D1 (fr)
WO (1) WO1990000115A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376314B1 (fr) * 1988-12-29 1994-10-12 Canon Kabushiki Kaisha Dispositif d'enregistrement par jet de liquide
KR0147902B1 (ko) * 1995-04-24 1998-08-17 김광호 액체금속을 이용한 잉크분사식 프린터 헤드의 제어장치 및 방법
US5797329A (en) * 1995-05-16 1998-08-25 Dataproducts Corporation Hot melt ink printer and method printing
US6231153B1 (en) * 1997-04-25 2001-05-15 Hewlett-Packard Company Method and apparatus for controlling an ink-jet print head temperature
US6802585B1 (en) * 1999-09-03 2004-10-12 Videojet Systems International, Inc. Print head ink temperature control device
US6427597B1 (en) 2000-01-27 2002-08-06 Patrice M. Aurenty Method of controlling image resolution on a substrate
WO2002070264A1 (fr) * 2001-03-01 2002-09-12 Zakrytoe Aktsionernoe Obschestvo 'patinor Koutings Limited' Tete pour imprimante a jet d'encre
US7918530B2 (en) * 2006-02-03 2011-04-05 Rr Donnelley Apparatus and method for cleaning an inkjet printhead
JP2008161750A (ja) * 2006-12-27 2008-07-17 Seiko Epson Corp 液滴吐出装置、及びデバイスの製造方法
US8888208B2 (en) 2012-04-27 2014-11-18 R.R. Donnelley & Sons Company System and method for removing air from an inkjet cartridge and an ink supply line
CN108778753B (zh) 2016-03-04 2020-04-21 R.R.当纳利父子公司 打印头维护台及其操作方法
CN207291314U (zh) 2016-05-09 2018-05-01 R.R.当纳利父子公司 油墨供应单元
WO2021126161A1 (fr) * 2019-12-16 2021-06-24 Hewlett-Packard Development Company, L.P. Matrices à fluide à chauffage intégré

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125586A (en) * 1977-04-07 1978-11-01 Sharp Corp Temperature controller
DE2903339B2 (de) * 1979-01-29 1980-11-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung zur temperaturabhängigen Spannungsregelung für piezoelektrische Schreibdüsen in Tintenmosaikschreibeinrichtungen
JPS58101066A (ja) * 1981-12-09 1983-06-16 Konishiroku Photo Ind Co Ltd インクジエツト記録装置
JPS58220757A (ja) * 1982-06-18 1983-12-22 Canon Inc 液体噴射記録装置
JPH0684080B2 (ja) * 1984-03-23 1994-10-26 キヤノン株式会社 液体噴射記録ヘツド
JPS60232962A (ja) * 1984-05-04 1985-11-19 Canon Inc 液体噴射記録装置
JPS6290250A (ja) * 1985-10-15 1987-04-24 Sanyo Electric Co Ltd インクジエツトプリンタの温度制御装置

Also Published As

Publication number Publication date
JPH03505431A (ja) 1991-11-28
US5182578A (en) 1993-01-26
WO1990000115A1 (fr) 1990-01-11
DE3880693D1 (de) 1993-06-03
EP0401216A1 (fr) 1990-12-12

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