EP1190858B1 - Verfahren und Vorrichtung zur Reinigung von Tintenstrahldruckerdüsen und Druckkopf und Drucker welche diese Vorrichtung verwenden - Google Patents

Verfahren und Vorrichtung zur Reinigung von Tintenstrahldruckerdüsen und Druckkopf und Drucker welche diese Vorrichtung verwenden Download PDF

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Publication number
EP1190858B1
EP1190858B1 EP01402453A EP01402453A EP1190858B1 EP 1190858 B1 EP1190858 B1 EP 1190858B1 EP 01402453 A EP01402453 A EP 01402453A EP 01402453 A EP01402453 A EP 01402453A EP 1190858 B1 EP1190858 B1 EP 1190858B1
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EP
European Patent Office
Prior art keywords
jet
cleaning
ink
nozzle
solvent
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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
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EP01402453A
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English (en)
French (fr)
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EP1190858A1 (de
Inventor
Thierry Colombat
Christophe Lopez
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Markem Imaje SAS
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Imaje SA
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Publication date
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Publication of EP1190858A1 publication Critical patent/EP1190858A1/de
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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
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • 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
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers

Definitions

  • the present invention relates to a method of cleaning the ink ejection nozzle (s) on an ink jet printer.
  • the invention also relates to a cleaning device implementing this method.
  • the subject of the invention is a print head with one or more nozzles incorporating such a cleaning device, as well as a printer comprising at least one printing head of this type.
  • the invention can be used in all ink jet printers, whether continuous ink jet or "drop on demand” type.
  • a print head emits at least one ink jet through a calibration orifice fed with pressurized ink.
  • This supply is made from a tank connected to a pump or pressurized by a gas.
  • Each jet is then broken up into drops of ink, which are electrically charged by charging electrodes, so as to be deflected or not by deflection electrodes located downstream. Depending on whether they are deviated or not, the drops come print or not a support arranged downstream.
  • At least one solenoid valve placed in the supply channel which connects the reservoir to the print head, generally allows the ink flow to be closed when the printer is stopped.
  • Printers operating according to this technique can use inks incorporating volatile solvents, very fast drying, or resins allowing good adhesion on difficult substrates, or even dispersion pigments allowing opaque marking of dark substrates.
  • the ink drops are ejected intermittently by a nozzle located on the wall of an ink cavity, in which a pressure below atmospheric pressure prevails.
  • the cavity is fed with ink from a reservoir by the simple effect of the capillary forces.
  • a piezoelectric or thermal transducer produces the ejection of the drop by deforming the wall of the cavity.
  • the reliability of operation depends mainly on the conditions at the orifices, that is to say the state of the nozzles through which the ink is ejected.
  • the continuous jet printers have a particularly delicate transient operating phase when the jet starts, that is to say when the printer goes from a state where the ink is at rest in the reservoir to a state where the continuous inkjet is set at high speed.
  • the slightest disturbance of the flow of the ink in the nozzle can deviate substantially the trajectory of the jet. This deflection can sometimes bring the ink into contact with the sensitive parts of the printer, located downstream of the nozzle, such as charge or deflection electrodes, which are brought to an electrical potential.
  • the characteristics of the jet establishment phase in a continuous jet printer are very similar to those of the intermittent ejection of a drop of ink in a "drop-on-demand" printer. That is why the solutions initially developed for one of the two technologies are usually transposed to the other.
  • a known solution to limit the consequences of deviated jet starts is to use retractable electrodes, which are out of reach of potential deflected jets during startup phases. This solution is relatively effective. However, it is cumbersome to implement if the operator has to manually move the electrodes. In addition, it is expensive because of the precision required for the alignment of the moving electrodes.
  • a first known solution to avoid starting with deviated jet is to manually clean the outer face of the nozzle before each start, for example by means of a bottle, with or without mechanical brushing. This type of cleaning often requires subsequent drying of the nozzle surface by means of an air jet. Depending on the type of ink used, mechanical scraping of the wet residues can also be implemented. This solution is particularly effective. However, it is long and not ergonomic for the user and its success is highly dependent on the skills of the operator.
  • a fourth known solution to avoid starting with deviated jets is to completely immerse the housing of the print head in a solvent.
  • This radical solution described in WO-A-99/01288, poses the problem of drying the elements of the print head which have been immersed. In addition, it does not provide a mechanical action on the outer face of the nozzle, when necessary. In addition, this solution leads to a high consumption of cleaning solvent, which is neither economical nor environmentally friendly, given the large amount of liquid waste produced.
  • GB-A-2 316 364 describes a variant of the preceding solution, wherein a cavity of limited volume is integral with the charging electrode and in contact with the outer face of the nozzle.
  • the cavity may alternatively be supplied with cleaning solvent or emptied of solvent residues by suction.
  • This solution substantially reduces the volumes of liquid used.
  • it also has the same shortcomings as the previous one concerning the lack of mechanical action and drying.
  • DE-U-87 14 304 discloses a method and a device for cleaning at least one ink ejection nozzle when the jet is stopped, in which a fixed nozzle located downstream of the ejection nozzle ink ejects a cleaning solvent in a direction oblique to the ink jet.
  • the invention specifically relates to a nozzle cleaning method for ensuring, in a simple and inexpensive way, without moving or retractable element, using a small volume of solvent, generating little waste and possibly adapted to the characteristics of the ink, all the operations necessary for the operation and total reliability of the print head, that is to say a watering of the external face of the nozzle with solvent, a mechanical action simultaneous localization to solvent immersion, scraping residues and evacuating them away from the peripheral area to the nozzle, as well as perfect drying and removal of any trace of solvent after cleaning.
  • the solvent leaving the nozzle is sprayed onto the nozzle in a cone of fine droplets ejected at high speed.
  • the micro droplets hit the peripheral area of the nozzle to be cleaned.
  • the mechanical impact of the droplets and the subsequent flow of the solvent on the front face of the nozzle plate lead to effective cleaning.
  • the angle of inclination of the sprayed solvent relative to the front face of the nozzle makes it possible to scrape and evacuate the debris out of the immediate vicinity of the nozzle, by the effect of friction.
  • the waste is projected towards the inside wall of the print head cover, in a zone very far from the electrodes.
  • a watering of the nozzle with a solvent, a simultaneous local mechanical action, scraping of the residues and their evacuation far from the zone of the nozzle are thus ensured, in a simple and inexpensive way, during the ejection of the solvent by the nozzle. .
  • the dry air then blown by the nozzle makes it possible to dry the environment of the nozzle, as well as the waste deposited on the inner wall of the hood.
  • a nozzle comprising an orifice having a diameter of between five and fifteen times that of the ink ejection nozzle is used.
  • the nozzle downstream of the ink ejection nozzle at a distance between five and fifteen times the diameter of the nozzle.
  • the nozzle and nozzle supply volumes and pressures are regulated according to the nature of the ink used in the printer.
  • the nozzle is supplied with cleaning solvent at a pressure greater than 100 mbar.
  • the nozzle is supplied with solvent and air by means of two solenoid valves or a three-way solenoid valve.
  • the printer is equipped with a porous surface for recovering cleaning residues, downstream of the ink ejection nozzle and opposite the nozzle relative to the nozzle.
  • the invention also relates to a device for cleaning at least one ink ejection nozzle of an ink jet printer, when the jet is stopped, said device comprising a fixed nozzle, located downstream of the ink ejection nozzle for ejecting a cleaning solvent, means for the fixed nozzle to blow dry air to the ink ejection nozzle in a direction oblique to the jet, when the device is implemented.
  • the invention also relates to a printing head comprising at least one ink ejection nozzle and a cleaning device thereof, made in the manner that has just been defined.
  • the invention further relates to a printer comprising at least one printing head of this type.
  • FIG. 1 diagrammatically shows, by way of example, a two-jet printing head incorporating a cleaning device according to the invention.
  • the invention is not limited to two-jet print heads and also relates to single-jet or three-jet print heads and more.
  • one or more one or more jet printing heads are usually connected to the same ink tank, to form an ink jet printer.
  • the print head shown in Figures 1 and 2 is of the continuous ink jet type.
  • the cleaning device according to the invention can also be used in a "drop on demand" type printing head without departing from the scope of the invention.
  • the print head illustrated in FIG. 1 comprises a housing 10 which supports, for each of the ink jets such as J1 and J2, a drop generator 12, a charge electrode surrounding the jet 14, and two deflection electrodes 16.
  • Each of the drop generators 12 delivers, in a controlled manner, an ink jet fragmented into fine droplets, from an ink ejection nozzle 18. More precisely, each of the jets such as J1 and J2 is emitted according to the axis of the nozzle 18, so that the directions of the jets are substantially parallel to each other when the print head is multi-jet.
  • a charging electrode 14 is placed downstream of each of the nozzles 12, instead of breaking the jet into droplets and has a slot which surrounds the trajectory of the corresponding jet. It is controlled in known manner, in order to electrically charge or not the ink droplets, depending on the impression to be made.
  • the deflection electrodes 16 are themselves placed downstream of the charging electrode 14, on either side of the path of the jet. Their function is, in a manner also known, to deviate or not the trajectories of ink droplets, depending on the electric field created by their different voltages electric.
  • the droplets of each of the jets such as J1 and J2 then follow a trajectory that depends on the electric charge that was given to them by the charging electrode 14. This technique makes it possible to print on any support, placed downstream of the deflection electrodes 16, the desired patterns. It is well known to those skilled in the art, so that it will not be a detailed description.
  • the print head illustrated in FIG. 1 comprises a nozzle cleaning device 18.
  • This device comprises in particular an injector 20, which appears more clearly in FIGS. 2 and 3.
  • the injector 20 comprises two nozzles 22, each of which is assigned to cleaning one of the nozzles 18.
  • the print head emits a single
  • one of the jets 22 and the corresponding nozzle 18 are shown in phantom in FIG. 3.
  • the injector 20 is mounted on the housing 10 of the print head at a fixed location. This location is located slightly downstream of the front face 19 of the nozzle plate in which the nozzle 18 is formed. In addition, this location is offset laterally with respect to the jets such as J1 and J2 and relative to the charging electrodes 14. , as illustrated in particular in FIGS. 1 and 2.
  • the injector 20 is placed between the two charging electrodes 14 assigned to each of the jets, equidistant from the two jets.
  • the injector 20 is a tubular element whose axis is oriented in a direction (generally vertical) orthogonal to the emission directions (generally horizontal) of the jets such as J1 and J2 at the outlet of the nozzles 18. This tubular element is open at its lower entrance end and closed at its upper end.
  • the nozzles 22 are generally circular holes which pass through its wall and are situated substantially in the plane of the trajectory of the jets J1 and J2. Each of the nozzles 22 is oriented towards one of the nozzles 18, as shown in FIGS. 2 and 3. Given the lateral offset of the injector 20 with respect to the ink jets, the jets issuing from the nozzles 22 are thus oriented in a direction oblique to the ink jets.
  • the relative arrangement between the nozzles 22 and the nozzles 18 is preferably such that the nozzles 22 are offset downstream relative to the nozzles 18, symmetrically to the jets, by a distance of between five and fifteen times the diameter of the nozzles 22.
  • the diameter of the nozzles 22 is given a value between five and fifteen times the diameter of the nozzles 18 (for the purpose of clarification, this characteristic has not been observed in FIG. ).
  • a particularly advantageous compromise leads to using nozzles 22 whose diameter is equal to ten times that of nozzles 18.
  • nozzles of 0.5 mm diameter can be used with nozzles of 50 microns in diameter.
  • the open bottom end of the tubular element embodying the injector 20 is sealingly connected to the outlet end of a supply pipe 24 (in the figure, the sizes are not respected).
  • the supply pipe 24 is connected to a reservoir of solvent 26, through a first solenoid valve 28.
  • the supply pipe 24 is of small internal diameter, for example 1 mm.
  • the solvent reservoir 26 can be constituted either by a closed reservoir such as a solvent cartridge, or by a tank open to the atmosphere.
  • a bypass pipe 30 is connected to the supply pipe 24, just downstream of the first solenoid valve 28. At its opposite end, the bypass pipe 30 communicates with a compressed air circuit, through a second solenoid valve 32.
  • the compressed air circuit is a network supplying, preferably, compressed air at a pressure higher than 3 bars.
  • a programmable central control unit 34 is electrically connected to each of the solenoid valves 28 and 32 so as to drive it.
  • the two-way solenoid valves 28 and 32 can be replaced by a three-way solenoid valve.
  • this central unit 34 notably makes it possible to regulate volumes and the supply pressures of the jets 22 in solvent and air, depending on the nature and characteristics of the ink used on the printer.
  • the elements of the cleaning device according to the invention other than the injector 20 are located in the ink circuit (not shown) of the printer.
  • the implementation of the device generally occurs before the start of the ink jet. It can also occur after stopping the jet, depending on the duration of the shutdown and the type of ink used on the printer.
  • a first phase of the cleaning cycle relates to the solvent filling of a section of the supply pipe 24 located downstream of the first solenoid valve 28.
  • the solvent reservoir 26 is a closed cartridge, it is first put in slight overpressure.
  • the second solenoid valve 32 is permanently opened, the supply pipe 24 being empty of solvent.
  • the first solenoid valve 28 is opened intermittently in a programmed sequence. The solvent cartridge is thus slightly pressurized.
  • the first phase continues with the setting up of a programmed volume of solvent in a section of the supply pipe 24 located downstream of the first solenoid valve 28.
  • the first solenoid valve 28 is opened for a period of time. programmed. This duration, which depends on the type of ink used and characteristics of the sprayer 20, is usually a few seconds.
  • a solvent volume of about 0.1 cm 3 can be put in place in a 100 mm section of a feed pipe 24 of 1 mm in diameter.
  • the two solenoid valves 28 and 32 are closed.
  • a second phase of the cleaning cycle consists of a displacement of the solvent in the feed pipe 24, up to the sprayer 20.
  • This second phase is triggered by an opening of the second solenoid valve 32.
  • the volume of solvent which is then in a portion of the supply pipe 24 adjacent to the first solenoid valve 28 is immediately pushed by the compressed air to the sprayer 20.
  • the small diameter of the supply pipe 24 ensures a relatively homogeneous flow of solvent, although it is mixed with air bubbles.
  • the displacement of the solvent in the supply pipe 24 is at about 0.5 m / s, as long as the air which is downstream is expelled from the nozzles 22.
  • the duration of this movement is of the order of 20 seconds.
  • the cleaning of the ink ejection nozzles 18 constitutes a third phase of the cycle of implementation of the device according to the invention.
  • This third phase extends, without interruption, the second phase during which the solvent is displaced in the feed pipe 24.
  • the ejection speed through the corresponding orifices is of the order of 20 m / s. This leads to spraying the solvent into a cone of fine droplets ejected at high speed. Given the orientation of the nozzles 22 to the nozzles 18, the micro droplets strike the peripheral zone of each of the nozzles to be cleaned.
  • the ink residues are projected towards the inner surfaces of the side walls 36 ( Figure 3) of the cover 10 of the printhead which are opposite the nozzles 22 relative to the nozzles 18 to be cleaned.
  • the ink residues are thus discharged in a zone very far from the electrodes 14 and 16.
  • the inner surfaces of the side walls 36 are then in the form of porous surfaces for the recovery of cleaning residues, at least downstream of the nozzles 18.
  • the spraying phase of the solvent-air mixture lasts about 10 seconds. However, it is important to note that the duration of this phase depends on the type of ink used on the printer.
  • a fourth and last phase of implementation of the cleaning device according to the invention consists of a drying operation, which continuously follows the cleaning phase of the nozzles.
  • the second solenoid valve 32 When all the solvent initially dosed in the feed pipe 24 has been sprayed onto the nozzles 18, the second solenoid valve 32 remains open for a programmed time. As a result, compressed dry air is blown onto the nozzles. This makes it possible to dry the environment of each of the nozzles 18, as well as the waste which is then on the inner face of each of the lateral walls 36 of the cover 10.
  • the cycle ends with the closing of the second solenoid valve 32.
  • the supply pipe 24 is then again empty of solvent and another washing cycle can begin, when necessary.
  • the entire cycle just described lasts about 40 seconds.
  • the sprayer 20 and the charging electrode 14 can also be carried by a common part which is then fixed on the housing 10.

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

Claims (15)

  1. Verfahren zur Reinigung mindestens einer Tintenausstoßdüse (18) eines Tintenstrahldruckers, wenn der Strahl angehalten ist, wobei das Verfahren die folgenden sukzessiven Schritte umfasst:
    - Ausstoßen eines Reinigungslösemittels zu der Tintenausstoßdüse (18) hin in einer in Bezug auf den Strahl schrägen Richtung aus einer stromab der Düse befindlichen feststehenden Spritzdüse (22), und
    - Blasen trockener Luft auf die Vorderfläche der Tintenausstoßdüse (18) von der feststehenden Spritzdüse (22) aus.
  2. Verfahren nach Anspruch 1, wobei eine Spritzdüse (22) verwendet wird, die eine Öffnung mit einem Durchmesser zwischen dem 5-fachen und 15-fachen der Tintenstrahldüse (18) umfasst.
  3. Verfahren nach einem der Ansprüche 1 oder 2, wobei die Strahldüse (22) stromab der Tintenausstoßdüse (18) in einem Abstand angeordnet wird, der zwischen dem 5-fachen und 15-fachen des Durchmessers der Strahldüse liegt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei die Lösemittel- und Luftvolumen und -einspeisedrücke der Strahldüse (22) gemäß der Art der in dem Drucker verwendeten Tinte geregelt werden.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Spritzdüse (22) mit Reinigungslösemittel mit einem Druck über 100 mbar versorgt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei die Versorgung der Spritzdüse (22) mit Lösemittel und Luft mittels zweier Elektroventile (28,32) oder mittels eines Dreiwege-Elektroventils gesteuert wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, wobei der Drucker mit einer porösen Oberfläche zur Rückführung von Reinigungsrückständen stromab der Tintenausstoßdüse (18) und gegenüber der Strahldüse (22) in Bezug auf die Düse versehen wird.
  8. Reinigungsvorrichtung mindestens einer Tintenausstoßdüse (18) eines Tintenstrahldruckers, wenn der Strahl angehalten ist, wobei die Vorrichtung eine feststehende Strahldüse (22) umfasst, die sich stromab der Tintenausstoßdüse (18) befindet, um ein Reinigungslösemittel auszustoßen, sowie Mittel (28,30,32), die es der feststehenden Strahldüse (22) ermöglichen, auf die Tintenausstoßdüse (18) in einer in Bezug auf den Strahl schrägen Richtung trockene Luft zu blasen, wenn die Vorrichtung in Gang gesetzt wird.
  9. Vorrichtung nach Anspruch 8, wobei die Strahldüse (22) eine Öffnung mit einem zwischen dem 5-fachen und 15-fachen der Tintenstrahldüse (18) liegenden Durchmesser aufweist.
  10. Vorrichtung nach einem der Ansprüche 8 oder 9, wobei die Strahldüse (22) stromab der Tintenstrahldüse (18) in einem Abstand angeordnet ist, der zwischen dem 5-fachen und 15-fachen des Durchmessers der Strahldüse liegt.
  11. Vorrichtung nach einem der Ansprüche 8 bis 10, wobei die Strahldüse (22) am Ende eines Versorgungsrohrs (24) angeordnet ist, das mit einem Lösemittelbehälter (26) über ein erstes Elektroventil (28), und mit einem Druckluftkreislauf über ein zweites Elektroventil (32) oder über ein Dreiwege-Elektroventil verbunden werden kann.
  12. Vorrichtung nach Anspruch 11, wobei die Elektroventile (28,32) mit einer programmierbaren zentralen Befehlseinheit (34) verbunden sind, welche die Volumen und Drücke der Versorgung der Spritzdüse (22) mit Lösemittel und Luft gemäß der Art der in dem Drucker verwendeten Tinte regeln kann.
  13. Vorrichtung nach einem der Ansprüche 8 bis 12, wobei eine poröse Oberfläche zur Zurückführung von Reinigungsrückständen stromab der Tintenausstoßdüse und gegenüber der Strahldüse (22) in Bezug auf die Düse vorgesehen ist.
  14. Druckkopf mit mindestens einer Tintenausstoßdüse (18) und einer Vorrichtung zur Reinigung der Düse gemäß einem der Ansprüche 8 bis 13.
  15. Drucker mit mindestens einem Druckkopf gemäß Anspruch 14.
EP01402453A 2000-09-26 2001-09-25 Verfahren und Vorrichtung zur Reinigung von Tintenstrahldruckerdüsen und Druckkopf und Drucker welche diese Vorrichtung verwenden Expired - Lifetime EP1190858B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0012204 2000-09-26
FR0012204A FR2814395B1 (fr) 2000-09-26 2000-09-26 Procede et dispositif de nettoyage de buses pour imprimantes a jet d'encre, et tete d'impression et imprimante integrant un tel dispositif

Publications (2)

Publication Number Publication Date
EP1190858A1 EP1190858A1 (de) 2002-03-27
EP1190858B1 true EP1190858B1 (de) 2006-06-14

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US (1) US6550889B2 (de)
EP (1) EP1190858B1 (de)
JP (1) JP2002103636A (de)
CN (1) CN1283465C (de)
DE (1) DE60120580D1 (de)
FR (1) FR2814395B1 (de)

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FR2814395B1 (fr) 2003-03-28
JP2002103636A (ja) 2002-04-09
EP1190858A1 (de) 2002-03-27
US20020036670A1 (en) 2002-03-28
FR2814395A1 (fr) 2002-03-29
CN1343565A (zh) 2002-04-10
CN1283465C (zh) 2006-11-08
DE60120580D1 (de) 2006-07-27
US6550889B2 (en) 2003-04-22

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