EP0137313B1 - Dispositif pour appareils à jet d'encre pour marquer des supports d'enregistrement - Google Patents

Dispositif pour appareils à jet d'encre pour marquer des supports d'enregistrement Download PDF

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Publication number
EP0137313B1
EP0137313B1 EP84110636A EP84110636A EP0137313B1 EP 0137313 B1 EP0137313 B1 EP 0137313B1 EP 84110636 A EP84110636 A EP 84110636A EP 84110636 A EP84110636 A EP 84110636A EP 0137313 B1 EP0137313 B1 EP 0137313B1
Authority
EP
European Patent Office
Prior art keywords
ejector
liquid
printing
head
liquid component
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
EP84110636A
Other languages
German (de)
English (en)
Other versions
EP0137313A1 (fr
Inventor
Emmeran Ing. Grad. Vollert
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 EP0137313A1 publication Critical patent/EP0137313A1/fr
Application granted granted Critical
Publication of EP0137313B1 publication Critical patent/EP0137313B1/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
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/15—Arrangement thereof for serial printing
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids

Definitions

  • the invention relates to a device for writing to a recording medium for ink writing devices according to the preamble of claim 1.
  • Another known measure provides for a gas or air flow to be directed onto the writing point after the writing liquid has been applied to the recording medium and thereby to reduce the drying time (US Pat. No. 4,340,893).
  • Another known arrangement is based on this principle of using two components as writing means, in which a non-pigmented liquid component ejected from a thin nozzle moves through a layer consisting of a second pigmented liquid component (US Pat. No. 4,196,437). .
  • the droplets emerging after penetrating the layer then form the actual writing fluid.
  • the unpigmented liquid component can e.g. B. can also be a drying agent.
  • the object of the invention is to improve the application of the individual liquid components in an ink writing device according to the generic term and with a structurally simple device while ensuring a constant flight speed and size of the droplets forming the characters, both the drying time of the droplets forming the characters on the recording medium and to reduce the consumption of the second liquid component.
  • Embodiments of the specified device are characterized in the subclaims.
  • the invention is essentially associated with the advantage that a liquid component causing the rapid drying of the writing liquid is dispensed separately from the actual writing head, that is to say the nozzles of the writing head can no longer become blocked due to drying, caused by evaporation of the solvent, and that it is possible is to use components that do not require special recording media.
  • both the liquid component emitted by the write head and the liquid component emitted by the ejection device can extend further Limits z. B. in terms of dye content, viscosity, evaporation, surface tension, etc. can be adjusted in an optimal manner.
  • the spatial separation of the individual components of the writing fluid causes drying of the component that contains the colors z. B. Avoided by evaporation of the solvent
  • neither the flight speed nor the size of those droplets that form the sign is changed.
  • the second ejection device is advantageously equipped with a spraying device, with the result that the second liquid component is applied in a distributed manner only over the area of a raster-recorded character.
  • FIGS. 1 and 2 is based on an arrangement in which the characters shown on the recording medium each after the application of the liquid component on the write head with the second liquid component, for. B. sprayed with a drying solvent.
  • the ejection device in the form of a second ejection head 2 is arranged spatially adjacent.
  • the writing head 1 and the ejection device 2 are arranged together on a writing carriage 3. This is moved in the line direction in front of the recording medium 4 by means of drive elements, not shown here.
  • the write head 1 and the ejection device 2 each have a liquid reservoir 5 and 6, a nozzle part 7 and 8 and electrical connections 9 and 10.
  • the nozzle part 7 or 8 is, for example, a nozzle plate.
  • the nozzle part 7 of the write head 1 has seven nozzle openings 11, from which individual droplets are expelled under the action of electromechanical transducers, not shown here.
  • this can be done in such a way that the nozzle openings are each connected to an ink channel running inside the write head, on which a piezo crystal acts.
  • the piezo crystal z. B. as a tube, which includes the ink channel over a part of its length, is generated with a corresponding control of the piezo tube inside the ink channel, caused by a change in the inner diameter of the piezo tube, a shock or pressure wave, which causes droplet ejection.
  • the second ejection device 2 has only a single nozzle opening 12, the diameter of which can be equal to or larger than the diameter of the nozzles 11 of the write head 1.
  • the ejection device 2 is equipped with a device for atomizing liquid. That can e.g. B. can be achieved by dispensing the liquid with a higher ejection frequency. This ensures that the liquid component, which is a drying solvent, is sprayed onto the recording medium 4 in a more or less finely divided form from the nozzle opening 12 of the ejection device 2.
  • the ejection device 2 is advantageously displaceable on the writing carriage 3 in such a way that its distance b from the recording medium 4 can be adjusted in accordance with the size of the surface to be sprayed.
  • the liquid component of the ejection device 2 then completely covers the dot matrix formed by the droplets emitted by the write head 1. Since a very rapid reaction occurs on the recording medium between the liquid components discharged from the ejection device 2 and the liquid components discharged from the write head 1, a disturbing impairment of the typeface is excluded.
  • the ejection device 2 is preferably arranged at a distance a from the writing head 1 on the writing carriage 3 such that its liquid is always dispensed when a complete character has been written. This distance is determined by the selected character grid for the representation of a character. For further explanation, reference is made to FIG. 3, in which a 7 ⁇ 5 grid for the representation of characters is assumed.
  • the discharge of the liquid component by the ejection device 2 preferably takes place at a point in time which is determined by the movement of the writing carriage by five grid columns.
  • 3 shows, after the corresponding number of droplets have been sprayed onto the recording medium in the manner characteristic of the character “E, the write head 1 has moved from the position 1a to the position 1b.
  • the output z. B. initiated by a control pulse derived from the corresponding column clock and the character «E •, d. H. the area 13 within which the character “E is shown” is covered with the liquid component dispensed by the ejection device 2.
  • this is z. B. smudge-proof.
  • the ejection device can have a number of outlet openings which corresponds in number and arrangement to the outlet openings of the write head.
  • FIGS. 4 and 5 show an exemplary embodiment of this.
  • the print head 1 and the ejection device 14 are in turn arranged on a common writing carriage 3 which is moved in front of the recording medium 4. Likewise, both each have a liquid container 5 and 6 for receiving the liquid components of the writing liquid.
  • the ejection device 14, like the write head 1 has seven outlet openings 15.
  • the ejection device 14 and the write head 1 are spatially offset by the distance a, but are at the same distance from the recording medium 4.
  • the control of the nozzles of the ejection device 14 takes place here with the same control pulse pattern that is supplied to the write head 1 to represent the characters. However, the ejection device is actuated at different times.
  • Both the spatially staggered arrangement and the staggered activation are determined by the mode of operation of the ink writing device. Based on a character representation in a 7 x 5 grid with a one-piece nozzle arrangement z. B. the distance a is three column steps and the activation of the ejection device 14 can be initiated with a delay determined by the same value. In this case, z.
  • the points forming the vertical row of the character “E” also point by point almost immediately after the application of the liquid components by the writing head with the liquid component through the ejection device.
  • the ejection device is arranged above or below the write head.
  • the ejection from the ejection device is switched on by a pulse derived from the line memory (page memory).
  • line memory page memory

Landscapes

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

Claims (8)

1. Dispositif pour des enregistreurs à encre servant à réaliser des inscriptions sur un support d'enregistrement avec un liquide d'écriture à deux composantes liquides, dans lesquels au moins les gouttelettes individuelles de la première composante liquide, qui forment un signe, sont expulsées, sous l'effet d'impulsions d'attaque, de tuyères individuelles d'une tête d'écriture, alors que la seconde composante liquide est fournie, avec décalage dans le temps, au support d'enregistrement de manière que celle-ci recouvre les gouttelettes, caractérisé par le fait qu'il est prévu sur le chariot (3), qui porte la tête d'inscription (1), connue en elle-même, un second dispositif d'expulsion (2, 14) disposé avec décalage par rapport à la tête d'écriture (1), que les composantes individuelles du liquide d'écriture sont contenues séparément dans le réservoir de liquide de réserve (5) de la tête d'écriture (1) et dans le - réservoir de liquide de réserve (6) du dispositif d'expulsion (2, 14), et que la composante liquide du liquide d'écriture, qui est contenue dans le réservoir de liquide de réserve (5) du dispositif d'expulsion (2, 14), est un solvant capable de sécher.
2. Dispositif selon la revendication 1, caractérisé par le fait que le dispositif d'expulsion (2) comporte au moins une ouverture de sortie (12) et émet les composantes liquides à l'état pulvérisé ou atomisé.
3. Dispositif selon la revendication 1 et 2, caractérisé par le fait que le dispositif d'expulsion (2) ne comporte qu'une seule ouverture de sortie, que pour le réglage de la distance (b) entre l'ouverture de sortie (12) du dispositif d'expulsion (2) et du support d'enregistrement (4), le dispositif d'expulsion (2) est disposé sur le chariot de façon à être déplaçable, et que la distance (b) est telle que les surfaces arrosées sur le support d'enregistrement (4), correspondent à la hauteur (h) d'un signe d'écriture.
4. Dispositif selon la revendication 1 et 2, caractérisé par le fait que le dispositif d'expulsion (2) est disposé sur le chariot (3) avec un décalage d'une distance (a) par rapport à la tête d'écriture (1 dans le sens de l'écriture, laquelle distance (a) est déterminée par le nombre de colonnes et par les intervalles entre colonnes d'un cycle d'impression (c) qui est prévu pour la représentation d'un signe.
5. Dispositif selon la revendication 4, caractérisé par le fait que la distance (a) entre le dispositif d'expulsion (2) et la tête d'écriture (1) est telle que le dispositif d'expulsion (2), après l'impression d'un signe par la tête d'écriture (1), se situe à peu près au milieu du signe imprimé.
6. Dispositif selon la revendication 4 et 5, caractérisé par le fait que le dispositif d'expulsion (2) est susceptible d'être mis en circuit pour la durée d'une opération d'atomisation, par une impulsion qui est dérivée de la cadence de colonne de la tête d'écriture.
7. Dispositif selon la revendication 1, caractérisé par le fait que le dispositif d'expulsion (14) comporte un nombre d'ouvertures de sortie (15) qui correspond au nombre et à la disposition des ouvertures de sortie (11) de la tête d'écriture, lesdites ouvertures de sortie (15) possédant la même distance par rapport au support d'enregistrement (4) que les ouvertures de sortie (11) de la tête d'écriture, que le dispositif d'expulsion (14) et la tête d'enregistrement (1) fournissent les composantes du type correspondant gouttelette par gouttelette et avec la même vitesse d'expulsion des gouttelettes, et que les impulsions d'attaque pour l'expulsion, gouttelette par gouttelette, des composantes liquides à partir du dispositif d'expulsion (14) sont identiques aux impulsions d'attaque pour l'expulsion, gouttelette par gouttelette, de la composante liquide à partir de la tête d'écriture (1), mais avec un décalage temporel d'au moins un pas de colonne.
8. Dispositif selon la revendication 1, caractérisé par le fait que le dispositif d'expulsion (2, 14) est disposé au-dessus ou en-dessous de la tête d'écriture (1), et que le dispositif d'expulsion (2, 14) est susceptible d'être mis en service par une impulsion qui est dérivée de la mémoire de la ligne.
EP84110636A 1983-09-08 1984-09-06 Dispositif pour appareils à jet d'encre pour marquer des supports d'enregistrement Expired EP0137313B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3332491 1983-09-08
DE3332491A DE3332491C2 (de) 1983-09-08 1983-09-08 Vorrichtung für Tintenschreibeinrichtungen zum Beschreiben eines Aufzeichnungsträgers

Publications (2)

Publication Number Publication Date
EP0137313A1 EP0137313A1 (fr) 1985-04-17
EP0137313B1 true EP0137313B1 (fr) 1987-07-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110636A Expired EP0137313B1 (fr) 1983-09-08 1984-09-06 Dispositif pour appareils à jet d'encre pour marquer des supports d'enregistrement

Country Status (4)

Country Link
US (1) US4599627A (fr)
EP (1) EP0137313B1 (fr)
JP (1) JPS6078752A (fr)
DE (2) DE3332491C2 (fr)

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EP0137313A1 (fr) 1985-04-17
DE3332491A1 (de) 1985-03-28
DE3465039D1 (en) 1987-09-03
JPS6078752A (ja) 1985-05-04
DE3332491C2 (de) 1985-10-10
US4599627A (en) 1986-07-08

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