EP0160019B1 - Tintenzuführeinrichtung für einen tintenstrahldruckkopf - Google Patents

Tintenzuführeinrichtung für einen tintenstrahldruckkopf Download PDF

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Publication number
EP0160019B1
EP0160019B1 EP19840903715 EP84903715A EP0160019B1 EP 0160019 B1 EP0160019 B1 EP 0160019B1 EP 19840903715 EP19840903715 EP 19840903715 EP 84903715 A EP84903715 A EP 84903715A EP 0160019 B1 EP0160019 B1 EP 0160019B1
Authority
EP
European Patent Office
Prior art keywords
ink
pipe system
solvent
electrovalve
pump
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
EP19840903715
Other languages
English (en)
French (fr)
Other versions
EP0160019A1 (de
Inventor
Luc Regnault
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.)
Markem Imaje SAS
Original Assignee
Imaje SA
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 Imaje SA filed Critical Imaje SA
Publication of EP0160019A1 publication Critical patent/EP0160019A1/de
Application granted granted Critical
Publication of EP0160019B1 publication Critical patent/EP0160019B1/de
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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2499—Mixture condition maintaining or sensing
    • Y10T137/2506—By viscosity or consistency

Definitions

  • the invention relates to an ink supply circuit for an ink jet print head. It also concerns any printer which is equipped with it.
  • the printing qualities of such a printer are intimately linked to the speed of ejection of the ink from the orifice.
  • the speed can be altered by a variation in ink pressure in front of the orifice, as well as by a variation in the viscosity of the ink. This can be due to a loss by evaporation of the solvent from the ink which is often very volatile.
  • such a device can overcome variations in viscosity but does not solve the problem of possible clogging of the nozzle.
  • the invention relates more precisely to an ink supply circuit of an ink jet print head of the type comprising an ink tank (1), the bottom (ab) of which has a first outlet connected to a pipe. (18) for supplying ink to a pressurization pump (5) supplying the body (10) of the print head through a supply line (20), an inlet connected to a supply line delivery (28) through which the unused ink passes, taken from a recovery gutter (11) and sucked through a recovery pipe (27) by means of a vacuum pump (7) ; characterized in that it further comprises a second outlet connected to a wetting line (45) connected to the vacuum pump (7), and a viscometer (V) placed below the ink tank (1) which essentially consists of a container (14) comprising three electrodes (32), (33), (34) which immerse therein at different levels whose function is to detect a high level (y) and a low level (x ) which makes it possible to measure the filling time (tr) between (x) and (y
  • the invention also relates to such an ink supply circuit, further equipped with a second auxiliary circuit comprising a combination of solenoid valves capable of unblocking the ink drop ejection orifice and cutting it off. blunt inkjet.
  • FIG. 1 schematically shows an embodiment of an ink supply circuit of a printhead according to the prior art.
  • FIG. 2 schematically represents an exemplary embodiment of a device according to the invention, capable of measuring the viscosity of the ink, cooperating with the pressurization circuit of FIG. 1.
  • FIG. 2 therefore schematically represents an ink supply circuit for an ink jet printhead 10.
  • a circuit essentially comprises a circuit ensuring the pressurization of the ink and a circuit ensuring a depressurization, intended to suck at the level of the recovery gutter 11 of the ink drops 100 not used.
  • the level 38 of the ink always, less than the height 37 of the internal partition 22, evolves from this level to the bottom of the reservoir.
  • the low level 21 of the ink is detected by means of a sensor 42.
  • This ink is conveyed by means of a supply line 18 passing through the bottom (ab) of the reservoir 1 to a pump 5 driven by a motor 4
  • the flow rate of the pump 5 is proportional to the speed of rotation of the motor 4.
  • the ink delivered by the pump 5 passes through a filter 8, a two-way pipe 190, one called the supply pipe carrying the reference 20 which routes it to the print head 10, the other called return line bearing the reference 19 which brings the ink through a calibrated leak 17 to the supply line 18.
  • Leak 17 creates a pressure drop proportional to the ink flow circulating in the latter.
  • the flow rate in the supply line 20 is completely negligible, compared to the flow rate of the pump 5 which passes through the leak 17.
  • the pressure of the line 18, downstream of the leak 17, is close to atmospheric pressure, which implies by the flow generated by the leak 17 and by the pump 5, that the pipes 19 and 20 are at a pressure higher than atmospheric pressure and almost proportional to the speed of rotation of the engine 4 .
  • a pressure sensor 9 is interposed on the pipe 19.
  • This sensor 9 in an exemplary embodiment comprises electrical contacts 44 and 43 delimiting the pressure zone to be respected and a feeler 450. This combination makes it possible to obtain a signal and the implementation of an associated electronic device (not shown) which permanently enslaves the speed of the motor 4 so that the pressure in the pipes 19 and 20 keeps a fixed and determined value whatever the variation of the parameters that govern it, such as internal pump leaks or improper calibration of the leak 17.
  • a vacuum circuit cooperates with the pressurization circuit described above, the function of which is to recover at the level of the gutter 11 the ink drops emitted by the head 10 and not used for the impression.
  • a so-called vacuum pump 7 of the same type as the so-called pressurizing pump 5 is used. These two pumps 5 and 7 can be connected to the same motor 4.
  • the pump 7 is a positive displacement pump which normally generates a flow of liquid. It may for example be a gear pump.
  • the ink drops 100, recovered at the level of the gutter 11, are sucked through a so-called suction pipe 27.
  • This type of pump may have internal leaks. In the case of liquids these are negligible, but they are predominant with gases.
  • an extension 26 plugged in A is intended to be connected if necessary to a device for measuring the viscosity of the ink as will be described later.
  • This operation of the pump 7 takes place and therefore this depression is created, even if the pipe 27 and its extension 26 contain air in high proportion.
  • the ink and the air are discharged to the sealed tank 1 by a so-called discharge pipe 28 and according to a characteristic of the invention this pipe 28 is connected to a rigid pipe 24 and perpendicular to the bottom (a, b) of the tank 1, located inside compartment C delimited by the partition 22.
  • This repressed ink obviously comes from the gutter 11 but also from the wetting line 45.
  • a minimum flow ink return to the sealed reservoir 1 by the rigid pipe 24 is maintained by the ink from the wetting circuit 45. This results in obtaining a constant level 37, the ink overflowing above the internal partition 22.
  • the line 27 reaches the maximum depression that the pump 7 can generate. If the printer is stopped at this time, the line 27 will suck ink from the reservoir 1 which can only be replaced by the air coming from the orifice 36.
  • the non-return valve 470 in this case prevents the return of bubbling liquid in the ink, which would imply a complete purging of the circuits.
  • solenoid valve 13 In normal operation the solenoid valve 13 is in the open position and the solenoid valve 12 in the closed position.
  • the line 20 may contain degraded ink. It may be useful in this case to replace it with fresh ink coming from the reservoir 1.
  • the flow of the ink jet cannot allow this operation to be done quickly while the opening of the solenoid valve 12 allows to create a significant flow in the line 20, and in the body 10 and therefore to refresh the ink quickly.
  • this solenoid valve 12 allows an easy uncorking of the orifice 41, if it is for example closed by a dust.
  • the solenoid valve 13 is closed for this and the solenoid valve 12 is opened so that the body 10 is then in depression. Under these conditions, it is possible to suck solvent through the orifice 41 and thus expel the dust towards the pipe 48.
  • FIG. 2 schematically represents an exemplary embodiment of a device capable of measuring the viscosity of the ink, called a viscometer V in the following description cooperating, in accordance with the invention, with the pressurization circuit described above
  • the filling time (tr) between x and y depends only on the viscosity of the ink.
  • a solenoid valve 15 cooperates with the viscometer (V) in the manner described below.
  • the solenoid valve 15 connects the bottom of the container 14 with point A, that is to say with the pipe 26 of the vacuum circuit described by means of FIG. 1.
  • the filling time (tr) increases. As soon as it reaches a setpoint considered as a limit, the viscosity is then corrected by adding solvent.
  • the coupling circuit of the two solenoid valves 12 and 13 is provided and operates as described above.
  • the invention applies to any type of inkjet printer.

Landscapes

  • Ink Jet (AREA)

Claims (9)

1. Tintenspeisekreis für einen Tintenstrahl-Druckkopf, vom Typ mit einem Tintenbehälter (1), dessen Boden (ab) einen ersten Ausgang aufweist, der mit einer Kanalisation (18) zur Tintenzufuhr zu einer druckerzeugenden Pumpe (5) verbunden ist, welche den Körper (10) des Druckkopfes über eine Speisekanalisation (20) versorgt, mit einem Eingang, welcher an eine Rücklaufkanalisation (28) angeschlossen ist, über welche die nicht verwendete Tinte strömt, die an einer Auffangrinne (11) abgenommen und über eine Rückgewinnungskanalisation (27) mittels einer Unterdruck erzeugenden Pumpe (7) angesaugt wird; dadurch gekennzeichnet, daß er ferner einen zweiten Ausgang aufweist, der mit einer Benetzungskanalisation (45) verbunden ist, die an die Unterdruck erzeugende Pumpe (7) angeschlossen ist, und ein Viskosimeter (V) aufweist, das gegenüber dem Tintenbehälter (1) abgesenkt angeordnet ist, welcher im wesentlichen aus einem Behälter (14) gebildet ist, der drei Elektroden (32), (33), (34) enthält, die darin auf verschiedenen Höhen eingetaucht sind und deren Funktion darin besteht, einen hohen Pegel (y) und einen niedrigen Pegel (x) festzustellen, wodurch es ermöglicht wird, die Auffüllzeit (tr) zwischen (x) und (y) und folglich die Viskosität der Tinte zu bestimmen, wobei dieses Viskosimeter mit Lösungsmittel-Zugabemitteln zusammenwirkt, wenn ein Viskositäts-Sollwert, der als Grenze angesehen wird, erreicht ist.
2. Speisekreis nach Anspruch 1, dadurch gekennzeichnet, daß die Lösungsmittel-Zugabemittel durch eine Gruppe von Ventilen (15) und (16) gebildet sind, die so angeordnet sind, daß bei Beendigung des Auffüllens des Behälters (14) über die Kanalisation (30) das Elektroventil (15) den Boden des Behälters (14) mit dem Punkt (A) in Verbindung bringt, welcher in der Unterdrucksetzungskanalisation (26 - 27) liegt; der Behälter (14) entleert sich dann über eine Ablaufkanalisation (31); das Elektroventil (15) ist dann geschlossen, und der Behälter (14) kann erneut gefüllt werden.
3. Speisekreis nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß bei Erreichen des Sollwertes das Elektroventil (16) einen Vorrat (2), der reines Lösungsmittel enthält, mit dem Punkt (A) in solcher Weise verbindet, daß Lösungsmittel über die Pumpe 7 zum Behälter (1) geschickt wird.
4. Speisekreis nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Lösungsmittelvorrat (2) abgedichtet und an eine Kanalisation (35) angeschlossen ist, welche dem Behälter (1) und dem Behälter (14) gemeinsam ist, in solcher Weise, daß das Lösungsmittel durch Luft ersetzt wird, ohne daß es in Berührung mit der Umgebungsluft ist, wobei diese Luft über die Pumpe (7) aus der Rinne herbeigeführt wird.
5. Speisekreis nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Luftüberschuß über eine Öffnung (36) nach Durchperlen eines Behälters (3) freigesetzt wird.
6. Speisekreis nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß er ferner Mittel umfaßt, die imstande sind, das Freiwerden der Öffnung (41) zu gewährleisten, aus welcher die Tintentröpfchen ausgestoßen werden, und das plötzliche Unterbrechen des Strahls zu gewährleisten.
7. Speisekreis nach Anspruch 6, dadurch gekennzeichnet, daß diese Freilegungsmittel gebildet sind durch eine Gruppe von Elektroventilen (12) und (13), die drei Funktionen erfüllen: Einerseits ermöglicht das Öffnen des Elektroventils (12) die Erzeugung eines hohen Durchsatzes in dem Körper (10) und gewährleistet so eine Tintenspülung; zum anderen ermöglicht das Schließen des Elektroventils (13) und das Öffnen des Elektroventils (12) eine Ansaugung von Lösungsmittel, welches der Bediener an der Ausstoßöffnung (41) zugibt, wobei durch diese Ansaugung eine Freilegung dieser Öffnung gewährleistet wird; schließlich verhindert im Zeitpunkt der Unterbrechung des Strahls das Öffnen des Elektroventils (12) vor dem Schließen des Elektroventils (13) das Verbleiben eines Drucks in den Kanalisationen (47) und (48), welche die Gruppe von Elektroventilen (12) und (13) mit dem Körper (10) verbinden, wodurch eine plötzliche Unterbrechung des Strahls gewährleistet wird.
8. Speisekreis nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß er ferner Mittel umfaßt, die imstande sind, den Druck zu messen, welcher in der Speisekanalisation (20) vorhanden ist.
EP19840903715 1983-10-13 1984-10-11 Tintenzuführeinrichtung für einen tintenstrahldruckkopf Expired EP0160019B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8316440 1983-10-13
FR8316440A FR2553341B1 (fr) 1983-10-13 1983-10-13 Circuit d'alimentation en encre d'une tete d'impression a jet d'encre

Publications (2)

Publication Number Publication Date
EP0160019A1 EP0160019A1 (de) 1985-11-06
EP0160019B1 true EP0160019B1 (de) 1988-04-27

Family

ID=9293186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840903715 Expired EP0160019B1 (de) 1983-10-13 1984-10-11 Tintenzuführeinrichtung für einen tintenstrahldruckkopf

Country Status (9)

Country Link
US (1) US4628329A (de)
EP (1) EP0160019B1 (de)
JP (1) JPS61500162A (de)
AU (1) AU581631B2 (de)
CA (1) CA1250486A (de)
DE (1) DE3470693D1 (de)
FR (1) FR2553341B1 (de)
IT (2) IT1179769B (de)
WO (1) WO1985001696A1 (de)

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FR2652540B1 (fr) * 1989-10-02 1995-06-02 Imaje Sa Circuit d'encre notamment destine a la mise en pression d'une encre a pigments pour imprimante a jet d'encre.
US5418557A (en) * 1991-10-03 1995-05-23 Videojet Systems International, Inc. Drop quality control system for jet printing
US5394177A (en) * 1992-05-29 1995-02-28 Scitex Digital Printing, Inc. Four inch fluid system
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US5980034A (en) * 1996-03-11 1999-11-09 Videojet Systems International, Inc. Cross flow nozzle system for an ink jet printer
EP0805038A1 (de) * 1996-05-02 1997-11-05 Quad/Tech, Inc. Lösungsmittelwiedergewinnungssystem für Farbstrahldrucker
WO1998017478A1 (en) * 1996-10-23 1998-04-30 Domino Printing Sciences Plc Continuous ink jet printer pump control
AU8552498A (en) 1997-08-01 1999-02-22 Marconi Data Systems Inc. Self-priming ink system for ink jet printers
DE19906826B4 (de) * 1998-09-01 2005-01-27 Hewlett-Packard Co. (N.D.Ges.D.Staates Delaware), Palo Alto Auf Druck basierender Tintenpegeldetektor und Verfahren zum Erfassen eines Tintenpegels
RU2212633C1 (ru) * 2002-05-27 2003-09-20 ЗАО "Институт электрокаплеструйных технологий" Гидросистема электрокаплеструйного принтера и ее элементы
US7918530B2 (en) 2006-02-03 2011-04-05 Rr Donnelley Apparatus and method for cleaning an inkjet printhead
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
FR3032651B1 (fr) 2015-02-13 2017-03-24 Dover Europe Sarl Procede et dispositif de nettoyage et de protection d'une connexion hydraulique
US10137691B2 (en) 2016-03-04 2018-11-27 R.R. Donnelley & Sons Company Printhead maintenance station and method of operating same
US10124597B2 (en) 2016-05-09 2018-11-13 R.R. Donnelley & Sons Company System and method for supplying ink to an inkjet printhead
US10632757B1 (en) * 2018-12-10 2020-04-28 Xerox Corporation System and method for attenuating the drying of ink from a printhead during idle periods
CN113829756B (zh) * 2021-09-07 2024-02-23 赛克华石标识技术(上海)有限公司 墨水喷码机粘度和耗材添加量检测装置及其工作方法

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Also Published As

Publication number Publication date
JPH0553632B2 (de) 1993-08-10
FR2553341B1 (fr) 1987-06-12
AU581631B2 (en) 1989-03-02
IT8453919V0 (it) 1984-10-12
AU3505284A (en) 1985-05-07
EP0160019A1 (de) 1985-11-06
US4628329A (en) 1986-12-09
CA1250486A (fr) 1989-02-28
DE3470693D1 (en) 1988-06-01
JPS61500162A (ja) 1986-01-30
IT1179769B (it) 1987-09-16
FR2553341A1 (fr) 1985-04-19
IT8468012A1 (it) 1986-04-12
IT8468012A0 (it) 1984-10-12
WO1985001696A1 (fr) 1985-04-25

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