EP0121895A2 - Tête d'écriture pour un dispositif d'écriture d'encre - Google Patents

Tête d'écriture pour un dispositif d'écriture d'encre Download PDF

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Publication number
EP0121895A2
EP0121895A2 EP84103656A EP84103656A EP0121895A2 EP 0121895 A2 EP0121895 A2 EP 0121895A2 EP 84103656 A EP84103656 A EP 84103656A EP 84103656 A EP84103656 A EP 84103656A EP 0121895 A2 EP0121895 A2 EP 0121895A2
Authority
EP
European Patent Office
Prior art keywords
ink
writing
ink container
head
container
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Withdrawn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
EP84103656A
Other languages
German (de)
English (en)
Other versions
EP0121895A3 (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 EP0121895A2 publication Critical patent/EP0121895A2/fr
Publication of EP0121895A3 publication Critical patent/EP0121895A3/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Withdrawn legal-status Critical Current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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor

Definitions

  • the invention relates to a writing head for an ink writing device with at least one writing nozzle in the form of an ink channel, which is associated with a drive element causing the detachment of ink droplets at the opening of the writing nozzle and which consists of an ink container e.g. is supplied with ink by capillary action, the level of the ink supply present in the ink container being arranged at or below the level of the writing nozzle opening.
  • Such a write head is e.g. Known from DE-PS 27 04 735 and can be constructed, for example, such that it contains several ink channels which open with their writing nozzle openings at the tip of the writing head in a grid-like distribution, which makes it possible, with suitable selective control of the respective e.g. to record piezoelectric drive elements with electrical voltage pulses in the course of a line-wise movement of the write head on a recording medium.
  • the respective drive element causes 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 leads to the detachment of ink droplets at the writing nozzle openings of the ink channels and to their transfer to the recording medium .
  • an ink reservoir is arranged behind the writing head body so that the level of the ink supply is below the level of the writing nozzle openings.
  • the writing nozzles are supplied with ink from the ink supply container by capillary action, an ink meniscus then being formed at each of the writing nozzle openings, which enables an ink droplet to be detached later by the pressure pulse described.
  • the level of the ink supply should not be too low below the level of the nozzle openings, because then the feeding of the ink channels and the formation of the ink meniscus at the nozzle openings are impaired, so that droplet detachment may no longer occur.
  • the level of the ink supply should not be above the writing nozzle openings either, because then the ink can run out of the writing nozzle openings.
  • ink writing devices are arranged such that their writing head writes in the horizontal direction on a recording medium guided in a vertical plane.
  • the recording medium is not arranged in a vertical plane but in an inclined plane with respect to the vertical, which means that the writing head should release the ink droplets obliquely upwards or obliquely downwards.
  • an arrangement such as is known, for example, from DE-PS 27 04 735 must be inclined accordingly with respect to the vertical can be positioned, which can lead to the fact that the level difference between the ink supply and the nozzle openings when writing obliquely upwards becomes too large in the horizontal arrangement, so that the writing process is interrupted due to a lack of meniscus formation at the nozzle openings, or that the level of the Writing nozzle openings when writing is obliquely downward below the level of the ink supply in the ink container, so that the ink emerges continuously from the writing nozzle openings. ;
  • the invention proceeds completely from this principle and provides for the arrangement of the ink container, for example, in the immediate vicinity of the writing nozzle opening. If such an arrangement is swiveled as a whole, the level difference between the writing nozzle opening and the ink supply remains practically the same even with larger swiveling movements, that is to say it changes only insignificantly, for example when swiveling upward, and within such limits that there is no fear of the ink droplet forming tearing off.
  • the downward swiveling of the print head can be carried out until the write nozzle openings reach below the level of the ink supply, which is the case after a considerably larger swivel range than was possible with previous devices of this type.
  • the ink container can be arranged next to or below the print head, depending on the design of the print head.
  • the ink container can advantageously be arranged under the write head, since there is usually space for accommodating the ink container due to the tapering shape of the write head.
  • the ink container is then expediently located under the writing head immediately behind the level of a writing object
  • the ink container can be mechanically connected to the writing head so that it is moved when the writing head is pivoted. In this way, the difference in level between the writing nozzle opening and the ink supply is kept practically constant within a large swiveling range.
  • the mechanical connection of the ink container to the print head can have a gimbal, which ensures that the ink container always hangs vertically below the print head in the various inclined positions. Although this increases the level difference between the writing nozzle opening and the ink supply in a large oblique position relative to the horizontal, the state in which the writing nozzle opening is below the level of the ink supply is later reached when the writing head tip is pivoted downward.
  • a half-gimbal is sufficient as a gimbal.
  • a stationary stop element is advantageously provided between the plane of the recording medium and the ink container.
  • 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 the illustrated embodiment in that tubular piezoelectric drive elements 14, which surround the ink channels 11, are selectively driven in rapid succession with voltage pulses, whereby they deform in the manner of a contraction and generate a pressure pulse in the respective ink channel 11, which of the ink present in the ink channel 11 has the effect that the ink is detached in droplets at the nozzle openings 12 and is fired onto the recording medium 13.
  • an ink supply system is provided, the ink container 15 of which is arranged under the body 10 directly behind the plane of the recording medium 13 and is connected to the body 10 via a mechanical connection 16, which has a joint device 17, preferably a semi-cardanic suspension, may contain.
  • the ink container 15 is connected via a line 18 to an ink chamber 19 which is common to all ink channels 11 and is formed between the body 10 and a rear plate 20 which is connected to it in a sealing manner.
  • Ink space 19 may e.g. have a width of 0.1 to 0.3 mm so that it fills with ink by capillary action.
  • the left side of the ink chamber 19 is connected to the ink channels 11 via a filter arrangement 21, which in the practical embodiment can have a thickness of 0.05 to 0.3 mm and a mesh size of 0.035 mm and e.g. consists of a fibrous plastic material.
  • the overall arrangement shown in the figure is inclined at an angle ⁇ with respect to the horizontal H, so that the writing direction of the writing head runs obliquely upwards on the inclined recording medium 13.
  • the dash-dotted line indicating the horizontal H is given a position by the inclination which corresponds to the dash-dotted line Hl.
  • the arrangement shown in the figure can also be tilted forward so that the record carrier 13 is then in a plane which runs obliquely from the top left to the bottom right.
  • This tilting process can be carried out until the level of the writing nozzle openings 12 is below the level of the ink supply in the ink container 15, because then the ink emerges continuously from the writing nozzle openings 12.
  • this state is only reached when the body 10 is very strongly inclined, in particular if the mechanical connection 16 between the ink container 15 and the body 10 contains a joint arrangement 17.
  • the ink tank 15 always hangs vertically under the body 10, and when the body 10 is tilted forward, the critical state, in which the level of the writing nozzle openings 12 is below the level of the ink supply, is correspondingly reached later. So that the ink container 15 does not get into the plane of the recording medium 13 and impairs its guidance, a stationary stop element 22 is provided which is firmly connected to the body 10 in the exemplary embodiment shown. If the body 10 is inclined downward with its left tip, the ink container 15 will strike the stop element 22 in a certain inclined position and thereby be kept away from the recording medium 13.
  • the ink tank 15 can also be just an intermediate container, which is made of a stationary container from z. B. is fed via a flexible line.
  • the ink container 15 can also be integrated in the body 10.
  • the ink container 15 can also be arranged stationary and via a flexible line 18 be connected to the print head.
  • the assignment principle shown schematically in the figure is fulfilled. It is expedient to arrange the ink container so that it always maintains a predetermined position regardless of the various inclination positions, for example of a writing mechanism containing the writing head. The corresponding position is then expediently located at one end of the line of the writing mechanism.
EP84103656A 1983-04-12 1984-04-03 Tête d'écriture pour un dispositif d'écriture d'encre Withdrawn EP0121895A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3313142A DE3313142A1 (de) 1983-04-12 1983-04-12 Schreibkopf fuer eine tintenschreibeinrichtung
DE3313142 1983-04-12

Publications (2)

Publication Number Publication Date
EP0121895A2 true EP0121895A2 (fr) 1984-10-17
EP0121895A3 EP0121895A3 (fr) 1985-06-12

Family

ID=6196111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103656A Withdrawn EP0121895A3 (fr) 1983-04-12 1984-04-03 Tête d'écriture pour un dispositif d'écriture d'encre

Country Status (4)

Country Link
US (1) US4575736A (fr)
EP (1) EP0121895A3 (fr)
JP (1) JPS59207260A (fr)
DE (1) DE3313142A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10129093A1 (de) * 2001-06-16 2003-01-02 Stork Gmbh Druckkopf mit zumindest einer geradlinigen oder mehreren zueinander versetzten Düsenreihen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2510083B2 (ja) * 1984-07-09 1996-06-26 キヤノン株式会社 インクジエツト記録装置
US5574530A (en) * 1994-10-19 1996-11-12 Fuji Photo Film Co., Ltd. Device for applying solvent for forming an image
US6514256B2 (en) 1997-01-02 2003-02-04 St. Francis Medical Technologies, Inc. Spine distraction implant and method
US5836948A (en) 1997-01-02 1998-11-17 Saint Francis Medical Technologies, Llc Spine distraction implant and method
US6068630A (en) 1997-01-02 2000-05-30 St. Francis Medical Technologies, Inc. Spine distraction implant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2842594A1 (de) * 1978-09-29 1980-04-10 Siemens Ag Anordnung zum versorgen eines tintenschreibkopfes mit tintenfluessigkeit
US4276554A (en) * 1979-01-24 1981-06-30 Canon Kabushiki Kaisha Ink jet mechanism for purging and activating
DE2704735C2 (de) * 1977-02-04 1982-08-05 Siemens AG, 1000 Berlin und 8000 München Auslaufsicherer Tintenvorratsbehälter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1012198A (en) * 1974-07-19 1977-06-14 Stephan B. Sears Method and apparatus for recording with writing fluids and drop projection means therefor
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
DE2808275C2 (de) * 1978-02-27 1983-03-10 NCR Corp., 45479 Dayton, Ohio Tintenstrahldruckkopf
JPS5640565A (en) * 1979-09-12 1981-04-16 Canon Inc Liquid injection recording device
US4429320A (en) * 1979-09-21 1984-01-31 Canon Kabushiki Kaisha Ink jet recording apparatus
JPS56137972A (en) * 1980-03-31 1981-10-28 Nec Corp Ink-jet printer by drop-on-demand method
JPS5718121U (fr) * 1980-06-20 1982-01-29
JPS5715975A (en) * 1980-07-04 1982-01-27 Hitachi Ltd Ink jet recorder
US4454518A (en) * 1982-05-12 1984-06-12 Ncr Corporation Temperature control of ink for ink jet printer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704735C2 (de) * 1977-02-04 1982-08-05 Siemens AG, 1000 Berlin und 8000 München Auslaufsicherer Tintenvorratsbehälter
DE2842594A1 (de) * 1978-09-29 1980-04-10 Siemens Ag Anordnung zum versorgen eines tintenschreibkopfes mit tintenfluessigkeit
US4276554A (en) * 1979-01-24 1981-06-30 Canon Kabushiki Kaisha Ink jet mechanism for purging and activating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10129093A1 (de) * 2001-06-16 2003-01-02 Stork Gmbh Druckkopf mit zumindest einer geradlinigen oder mehreren zueinander versetzten Düsenreihen
DE10129093B4 (de) * 2001-06-16 2006-02-02 Stork Gmbh Druckkopf mit zumindest einer geradlinigen oder mehreren zueinander versetzten Düsenreihen

Also Published As

Publication number Publication date
DE3313142A1 (de) 1984-10-18
EP0121895A3 (fr) 1985-06-12
US4575736A (en) 1986-03-11
JPS59207260A (ja) 1984-11-24

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Inventor name: ROESCHLEIN, ROLF

Inventor name: SCHULTE, HEINZ