EP0172995A1 - Dispositif de commande pour imprimante à projection d'encre - Google Patents

Dispositif de commande pour imprimante à projection d'encre Download PDF

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Publication number
EP0172995A1
EP0172995A1 EP85106074A EP85106074A EP0172995A1 EP 0172995 A1 EP0172995 A1 EP 0172995A1 EP 85106074 A EP85106074 A EP 85106074A EP 85106074 A EP85106074 A EP 85106074A EP 0172995 A1 EP0172995 A1 EP 0172995A1
Authority
EP
European Patent Office
Prior art keywords
ink
nozzle body
valve
line
pressure
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Withdrawn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
EP85106074A
Other languages
German (de)
English (en)
Inventor
Rudolf Pospichal
Karl-Anton Stroppel
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.)
Rheinmetall Soldier Electronics GmbH
Original Assignee
Contraves GmbH
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 Contraves GmbH filed Critical Contraves GmbH
Publication of EP0172995A1 publication Critical patent/EP0172995A1/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Withdrawn legal-status Critical Current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
    • B41J2/1707—Conditioning of the inside of ink supply circuits, e.g. flushing during start-up or shut-down

Definitions

  • the invention relates to a control arrangement for an ink supply system for preventing ink drops from drying out at the nozzle opening of an ink jet printer provided with first means for generating an ink jet and with second means for ejecting, charging and deflecting the ink drops.
  • drying and clogging of the nozzle opening can occur in short intervals of successive printing processes or when the printing process is interrupted (operational malfunctions) and also when the ambient temperature changes, the risk of drying and clogging of the nozzle opening often being caused by a Switching off the ink jet resulting dripping is increased.
  • the control arrangement according to the invention also deals with the problem of restarting the inkjet printer after brief interruptions, for example caused by power failures, at which interruptions the present pressure in the system largely remains.
  • This problem is essentially solved in that the first means provided to build up the required operating pressure are assigned a venting and shut-off valve which is operatively connected to the ink supply system via a bypass line and opens in the event of malfunctions in the event of a malfunction.
  • Fig.l shows the ink supply system shown as a block diagram (without electrical lines) for an inkjet printer designated in its entirety with 50, which essentially comprises a housing 45 with first means arranged therein for the pressure build-up and a writing or spraying head 40 with second means for ejecting an ink jet S and charging and deflecting ink drops (not shown).
  • an ink reservoir 1 In the housing 45, shown schematically as a block in FIG. 1, an ink reservoir 1, a pressure pump 3, a filter element 4, a pressure relief valve 6, a first valve 8, one that is operatively connected to a pressure gauge 11 and in the direction of the arrow X can be seen Operating pressure regulating pressure reducer 10, a second valve 13 and a suction pump 15.
  • the first valve 8 is preferably designed as a venting and shut-off valve and the second valve 13 as a venting valve.
  • the writing or spraying head 40 also shown schematically as a block in FIG. 1, essentially comprises a nozzle body 30 with associated means 35 for charging and deflecting ink drops (not shown), an ink flow valve 25, a drip catcher 27, a first check valve 28 and a second one Check valve 29.
  • the individual elements of the write or spray head 40 are lines 26, 26 'leading via ink liquid; 12.12 '; and 14, 14 'are operatively connected to the individual elements of the housing 45.
  • FIG. 2 shows an exemplary embodiment of the filter element 4, shown schematically and in a sectional view, which essentially comprises a lower housing part 23, an upper housing part 20 and an insertable filter 24.
  • the lower housing part 23 one can see an input 21 for connecting a line 2 '(FIG. 1) and an output 21 'for the connection of a line 2 "(FIG. 1).
  • the upper housing part 20 one can see an output 22 for the connection of a line 5 (FIG. 1).
  • the lower housing part 23 is shown schematically on the inside Centering 23 'provided for the filter 24.
  • the front section of the nozzle body 30 is shown on a larger scale and in a sectional view, and a section of the rocking plunger 32 arranged in a recess 33 of the nozzle body 30, a nozzle opening 31 and the ink column of the inks labeled T are shown - or writing fluid.
  • 3 shows the ink column T in the operating state of the inkjet printer and in FIG. 4 after the latter has been switched off, an air bubble serving as a protective cushion and designated L being built up in front of the rocking plunger 32 when the latter is switched off.
  • the ink supply valve 25 in the spray head 40 is closed until the required operating pressure is reached, so that the ink until the required operating pressure is reached via the filter element 4, on the one hand in the direction of arrow A ', the pressure reducer 10 and on the other hand via the line 5 in the direction of the arrow B to the pressure relief valve 6 and if the operating pressure is exceeded via a line 5 'in the direction of the arrow B' into the ink reservoir 1.
  • the ink supply valve 25 in the spray head 40 is opened by means of electrical means (not shown), as a result of which the pressure in the nozzle body 30 builds up in such a way that the ink jet is used in a manner known per se by means of the oscillating plunger 32 S and a plurality of ink drops are generated by the means 35 (not shown) and deflected in a predetermined direction.
  • the non-required and undeflected ink drops are detected by the drip catcher 27 and, with the check valve 29 open, by the action of the suction pump 15 via the suction line 14, 14 'in the direction of the arrow C, C' and via the line 14 "in the direction of the arrow C" in the inks - Reservoir 1 returned.
  • the ink supply valve 25 When switching off, the ink supply valve 25 is closed and the vent valve 13 is opened after a predetermined time interval, so that the ink column present between the check valve 28 and the vent valve 13 in the vent line 12, 12 'is accelerated by the pressure drop in the direction of the arrow D and via the Line 12 ", the suction pump 15 and line 14" is guided into the ink reservoir 1 according to the direction of the arrow C ".
  • the check valve 28 provided between the nozzle body 30 and the vent valve 13 in the vent line 12, 12 'serves to ensure that when the pressure of the ink column in the vent line 12, 12' is reversed or if there is a geodetic gradient between the vent valve 13 and No ink is pressed into the nozzle body 30 in the direction of the nozzle body 30 and thus into the nozzle opening 31.
  • the two pumps 3, 15 are stopped, the pressure in the system largely remaining and either preventing the system from starting or making it considerably more difficult.
  • the venting and shut-off valve 8 which is connected in parallel to the pressure pump 3 by means of lines 7, 7 ', is provided and is opened in the event of a malfunction and let the pressure drop. After the inkjet printer has been switched on, a new pressure build-up can take place by means of the pressure pump 3.
  • the lines 7, 7 'with the venting and shutoff valve 8 essentially form a bypass.
  • the ink flow T 'pressed into the upper area of the filter element 4 is conducted with a correspondingly large delivery flow of the pressure pump 3 via the line 5, the pressure relief valve 6 and via the line 5' in the direction of the arrow B 'into the ink reservoir 1, so that a constant air separation takes place at the pressure relief valve 6.
  • the ventilation valve 13 which is operatively connected to the nozzle body 30 via the ventilation line 12 'is preferably opened for about 6 seconds, so that An increased ink flow occurs in the nozzle body 30 and thereby any air pockets still present are expelled and removed by the vent valve 13. After this venting process, the inks are Jet printer ready for operation and ensures an optimal recording process.
  • the line cross section in the area of the connection point (not shown) formed by the ventilation line 12 and suction line 14 ′′ is preferably to be dimensioned such that the ink volume flow in the ventilation process described above does not influence the suction process from the drip 27.

Landscapes

  • Ink Jet (AREA)
EP85106074A 1984-08-27 1985-05-17 Dispositif de commande pour imprimante à projection d'encre Withdrawn EP0172995A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH407384 1984-08-27
CH4073/84 1984-08-27

Publications (1)

Publication Number Publication Date
EP0172995A1 true EP0172995A1 (fr) 1986-03-05

Family

ID=4269308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106074A Withdrawn EP0172995A1 (fr) 1984-08-27 1985-05-17 Dispositif de commande pour imprimante à projection d'encre

Country Status (1)

Country Link
EP (1) EP0172995A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424008A1 (fr) * 1989-10-11 1991-04-24 Linx Printing Technologies Plc Procédé et dispositif pour nettoyer une tête d'impression à jet d'encre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 224 (M-170)[1102], November 1982; & JP - A - 57 128 562 (RICOH K.K.) 10.08.1982 *
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 253 (M-178)[1131], 11. Dezember 1982; & JP - A - 57 148 658 (RICOH K.K.) 14.09.1982 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424008A1 (fr) * 1989-10-11 1991-04-24 Linx Printing Technologies Plc Procédé et dispositif pour nettoyer une tête d'impression à jet d'encre
US5126752A (en) * 1989-10-11 1992-06-30 Linx Printing Technologies Limited Ink jet printer head flushing system

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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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Effective date: 19860806

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Effective date: 19871021

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Owner name: CONTRAVES GMBH

18D Application deemed to be withdrawn

Effective date: 19880301

RIN1 Information on inventor provided before grant (corrected)

Inventor name: POSPICHAL, RUDOLF

Inventor name: STROPPEL, KARL-ANTON