EP0724960B1 - Security filter equipped modulation device for an ink jet printhead - Google Patents

Security filter equipped modulation device for an ink jet printhead Download PDF

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Publication number
EP0724960B1
EP0724960B1 EP96400205A EP96400205A EP0724960B1 EP 0724960 B1 EP0724960 B1 EP 0724960B1 EP 96400205 A EP96400205 A EP 96400205A EP 96400205 A EP96400205 A EP 96400205A EP 0724960 B1 EP0724960 B1 EP 0724960B1
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EP
European Patent Office
Prior art keywords
gun
ink
modulating device
support
ink jet
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EP96400205A
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German (de)
French (fr)
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EP0724960A1 (en
Inventor
Thierry Colombat
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Markem Imaje SAS
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Imaje SA
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    • 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
    • B41J2/17563—Ink filters

Definitions

  • the present invention relates to a device modulation fitted with a head safety filter inkjet printing.
  • the various jet printing technologies ink use micro-holes for calibrate the diameter of the jets or drops.
  • the dimensions common are of the order of 20 to 80 ⁇ m in diameter.
  • the nozzles through which these jets or drops should remain free of impurity for maintain good print quality.
  • all inkjet printers, and particular continuous inkjet is equipped with filtration systems that maintain the circuits hydraulic to a level of cleanliness compatible with the level of precision of the components put in place for such technologies.
  • Security filters commonly known as LCF (from the English “Last Chance Filter”), are used in virtually all inkjet printers, at points more or less close to the nozzles.
  • the security filters used on these known art devices are filters ensuring transverse filtration. This filtration process forces the ink mixture to pass through perpendicularly the filter as shown by the Figure 1.
  • the transverse filter 40 is represented in the enclosure 41 arranged in the ink circuit, between a supply duct 42 and an outlet duct 43.
  • the duct 42 connected to the pressure track, directs the mixture constituting the ink towards the transverse filter 40.
  • the duct 43 directs the filtrate obtained towards the ink emission nozzle.
  • the solid phase of this mixture is gradually deposited, which translates after a certain time by the clogging of the filter 40. This clogging problem is also poses with the use of pigment ink. This situation increases the pressure drop in the pipe and leads to the change of the filter or to subject this filter to a regeneration cycle.
  • a modulation device for inkjet print head using the principle of tangential filtration.
  • the application of this principle allows, at the time of opening the bleed path, to keep the inkjet running while letting the fluid flow at high flow parallel to the filtering surface and in particular against the outer wall of the filter. This movement of scanning in the cooling phase washes constantly the filter surface and prevents the deposition of particles.
  • the subject of the invention is therefore a device modulation for inkjet print head comprising a support supporting a barrel equipped with a nozzle for the emission of the inkjet, means for introducing pressurized ink, means for inkjet control associated with the barrel, means ink filtration, the barrel defining a circuit allowing the circulation of the ink introduced overall up to the nozzle, characterized in that the filtration means are means of tangential filtration, means of purging being provided for removing unfiltered ink.
  • the barrel may include a body which is tightly engaged in the support, the space between the barrel body and the support constituting a chamber, the filtration means separating the chamber in an upstream part where lead the means of introducing ink and where the purge means, and a downstream part communicating with said canon ink circuit.
  • the modulation device according to the invention is preferably generally cylindrical around an axis which is the axis of the inkjet, the means of filtration, said spacer, being of tubular shape.
  • the ink circuit of the barrel is then advantageously constituted by a channel pierced in the barrel body.
  • the barrel body can be engaged in the waterproof support thanks to two seals expandable under pressure, mounted around of the body and located at each end of said spacer.
  • the barrel, the spacer, the two seals expandable and an assembly nut, and possibly the ink jet control means can be mounted apart from the support to constitute a set monobloc.
  • Figure 2 shows a filter 50 arranged in the enclosure 51 tangentially to the flow of ink.
  • the mixture constituting the ink is introduced into the enclosure 51 by the conduit 52 connected to the track pressure.
  • Part of this ink mixture is filtered by the tangential filter 50 to constitute the filtrate which is directed, through conduit 53, towards the nozzle ink emission.
  • the retentate is evacuated by the leads 54 to the purge path.
  • the device comprises a support 1 which is intended to be fixed on the mechanical structure of the print head (see Figure 1 of the document FR-A-2 653 063).
  • Body 1 has a part tubular 4 axis coincides with the axis of the inkjet.
  • the body is housed 2 of the barrel 3 which is a part of general shape cylindrical, of axis of revolution coincident with the axis of the tubular part 4.
  • the barrel 3 is drilled through from an axial hole 8.
  • the body 2 constitutes the lower part of the barrel 3.
  • a shoulder 5 constitutes the separation between the body 2 and the upper part of the barrel 3.
  • the body 2 is provided with an upper groove 6 near of the shoulder 5 and of a lower groove 7.
  • the lower end 9 of the body 2 is threaded to receive the nut 10.
  • Radial holes 11, 12 drilled respectively in grooves 6 and 7 provide the communication between the axial hole 8 and the grooves 6 and 7.
  • the shaped joint 13 ring, tubular spacer 14 and seal 15 also in the shape of a ring.
  • the average diameters of seals 13 and 15 correspond to the diameter of the spacer 14. This makes the seal 13, the spacer 14 and the seal 15 constitute a stack.
  • the seal 13 abuts on the shoulder 5 of the barrel and the pressure exerted by the nut 10, during screwing, on the joint 15 affects joint 13 via the spacer 14.
  • the seals 13 and 15 are seals expandable under pressure.
  • the tightening of nut 10 therefore causes the application of seals 13 and 15 on the inner wall of the tubular part 4, thus ensuring at the same time the sealing at the level joints and fixing the barrel 3 to the support 1.
  • the nut 10 does not come in support on the tubular part 4 of the support. His action works only on the joint stack 13 - spacer 14 - seal 15.
  • the spacer 14 is provided with a groove upper 16 and lower groove 17. Holes 18 and 19 are drilled radially and respectively in grooves 16 and 17. During assembly, grooves 16 and 17 of the spacer 14 are located opposite the grooves 6 and 7, respectively, of body 2.
  • the support 4 is provided with a connector 21 for introducing pressurized ink into the part tubular 4 and a connector 22 for purging of this same tubular part.
  • These fittings 21 and 22 open near the gorges respectively 16 and 17 of the spacer 14.
  • Resonator 25 which stimulates the inkjet, is introduced by its end 24 in barrel 3 through the upper hole of the hole 8, through the seal 20.
  • the other end of the resonator is extended by an electric cable 23 to an external control member. Cable 23 passes in the axial hole 27 of the flange 28.
  • the fixing of the resonator in the barrel is done in the following way.
  • the equipped resonator 25 of seal 20 is pressed into hole 8 until the underside of the seal 20 abuts on a shoulder provided in the hole 8.
  • the collar 26 then comes into abutment on the upper face of the seal 20.
  • the flange is slid along the cable 23 and its threaded lower part 29 is screwed into the part upper threaded from hole 8 until pressed the seal 20.
  • the device operates as following.
  • the pressurized ink injected by the connection 21 bathes the outside of the spacer 14 and enters inside through holes 18 to reach the external part of the body 2 of the barrel.
  • Ink passes in the holes 11 of the groove 6, penetrates inside of the barrel by bathing the resonator 25 and goes towards the end 9 of the barrel which is terminated by a washer (not visible in Figure 1) pierced with a axial hole serving as an ink emission nozzle.
  • the purge of the device is done by return of the ink, thanks at the holes 12, in the tubular space between the body 2 and the spacer 14 then, thanks to the holes 19 of the spacer, in the tubular space included between the spacer 14 and the tubular part of the support.
  • the ink is then discharged through the connector 22.
  • the inkjet stimulated by the resonator 25, is therefore done along the axis of the device as well as the arrow drawn under the nut 10 is shown.
  • FIG. 4 illustrating the invention, the same references as in FIG. 3 represent the same items.
  • the device has been shown partially assembled.
  • the spacer in Figure 3a been replaced by a filter spacer 30 used both spacer and safety filter.
  • This filtering spacer ensures transverse filtration of the ink and constitutes a safety filter for the device. This filter is further washed continuously by the incoming ink.
  • Such a solution can be adapted to different assemblies with tubular or flat filter, while accommodating many media: fabrics metallic, synthetic fabrics and membranes.
  • the solution proposed by Figure 4 includes a nut 31 different from that of FIG. 3.
  • the nut which previously included (see Figure 3) a shoulder provided with holes for tightening, is modified so that its outside diameter aligns with that of the spacer and that its operation is carried out from a hexagonal shape.

Landscapes

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

Description

La présente invention concerne un dispositif de modulation équipé d'un filtre de sécurité pour tête d'impression à jet d'encre.The present invention relates to a device modulation fitted with a head safety filter inkjet printing.

Les diverses technologies d'impression à jet d'encre mettent en oeuvre des micro-orifices pour calibrer le diamètre des jets ou gouttes. Les dimensions courantes sont de l'ordre de 20 à 80 µm de diamètre. Les buses par lesquelles sont émis ces jets ou ces gouttes doivent rester exemptes d'impureté pour maintenir une bonne qualité d'impression. Pour cela, l'ensemble des imprimantes à jet d'encre, et en particulier à jet d'encre continu, est équipé de systèmes de filtration qui maintiennent les circuits hydrauliques à un niveau de propreté compatible avec le niveau de précision des composants mis en place pour de telles technologies.The various jet printing technologies ink use micro-holes for calibrate the diameter of the jets or drops. The dimensions common are of the order of 20 to 80 µm in diameter. The nozzles through which these jets or drops should remain free of impurity for maintain good print quality. For that, all inkjet printers, and particular continuous inkjet, is equipped with filtration systems that maintain the circuits hydraulic to a level of cleanliness compatible with the level of precision of the components put in place for such technologies.

Ces filtres peuvent être placés en divers points particuliers du circuit.These filters can be placed in various particular points of the circuit.

On trouve d'abord des filtres sur le circuit d'aspiration. Les conduits d'aspiration, équipés en général de crépines doivent avoir une très faible perte de charge, aussi leur conception (dimension, finesse de filtration) ne participe pratiquement pas au maintien du niveau de propreté du circuit.First there are filters on the circuit suction. The suction ducts, equipped with general strainers must have very low loss load, also their design (size, fineness practically does not participate in the maintenance the level of cleanliness of the circuit.

On trouve ensuite des filtres en sortie de pompe ou de conduit pression. A ces endroits, la présence d'un filtre fin est essentielle pour la propreté du circuit puisque l'usure des divers éléments mobiles de l'appareil libère des particules qui se répandent dans le liquide du circuit. Il est donc très important de les arrêter avant qu'elles ne polluent l'ensemble de l'installation. Les impuretés sont à ce niveau arrêtées par un élément filtrant qui doit être nettoyé ou remplacé périodiquement. Then there are filters at the output of pump or pressure line. At these locations, the presence of a fine filter is essential for cleanliness of the circuit since the wear of the various elements of the device releases particles which spill into the circuit liquid. So it's very important to stop them before they pollute the whole installation. The impurities are at this level stopped by a filter element which must be cleaned or replaced periodically.

On trouve enfin des filtres de sécurité placés en des points judicieusement choisis. Ils retiennent les contaminations d'origine variée telles que les fibres rejetées par le filtre principal, les pollutions enfermées entre filtre principal et buses d'émission d'encre, au moment du montage, les diverses contaminations introduites à l'ouverture du circuit pendant une opération de maintenance. Ils assurent un fonctionnement fiable de l'imprimante et en particulier ils évitent la pollution de la buse. La règle est que l'élément filtrant soit situé au plus près de la buse.Finally there are security filters placed at carefully chosen points. They hold back contamination of various origins such as fibers rejected by the main filter, pollution enclosed between main filter and emission nozzles ink, at the time of assembly, the various contamination introduced at the opening of the circuit during a maintenance operation. They ensure reliable printer operation and particular they avoid the pollution of the nozzle. The rule is that the filter element is located at most near the nozzle.

Les filtres de sécurité, communément appelés LCF (de l'anglais "Last Chance Filter"), sont utilisés dans pratiquement toutes les imprimantes à jet d'encre, en des points plus ou moins proches des buses.Security filters, commonly known as LCF (from the English "Last Chance Filter"), are used in virtually all inkjet printers, at points more or less close to the nozzles.

L'efficacité maximale est obtenue lorsque le filtre est situé à proximité des buses. Ce montage, comme celui décrit dans le brevet US-A-5 063 393, assure un maintien de propreté optimal de la buse.Maximum efficiency is achieved when the filter is located near the nozzles. This montage, like that described in patent US-A-5,063,393, ensures optimal cleanliness of the nozzle.

Ce choix est de même retenu dans la plupart des imprimantes bureautiques, du type goutte à la demande, pour maintenir les buses propres pendant l'utilisation de la tête d'impression ou pendant le processus de réalisation comme indiqué dans le brevet US-A-4 864 329.This choice is also retained in most office printers, drop-type request, to keep the nozzles clean for using the print head or during production process as indicated in the patent US-A-4,864,329.

Les filtres de sécurité utilisés sur ces dispositifs de l'art connu sont des filtres assurant une filtration transversale. Ce procédé de filtration oblige le mélange constituant l'encre à traverser perpendiculairement le filtre ainsi que le montre la figure 1. Sur cette figure, le filtre transversal 40 est représenté dans l'enceinte 41 disposée dans le circuit de l'encre, entre un conduit d'amenée 42 et un conduit de sortie 43. Le conduit 42, relié à la voie pression, dirige le mélange constituant l'encre vers le filtre transversal 40. Le conduit 43 dirige le filtrat obtenu vers la buse d'émission d'encre. La phase solide de ce mélange se dépose progressivement, ce qui se traduit au bout d'un certain temps par le colmatage du filtre 40. Ce problème de colmatage se pose également avec l'utilisation d'encre pigmentaire. Cette situation augmente la perte de charge dans la canalisation et conduit au changement du filtre ou à soumettre ce filtre à un cycle de régénération.The security filters used on these known art devices are filters ensuring transverse filtration. This filtration process forces the ink mixture to pass through perpendicularly the filter as shown by the Figure 1. In this figure, the transverse filter 40 is represented in the enclosure 41 arranged in the ink circuit, between a supply duct 42 and an outlet duct 43. The duct 42, connected to the pressure track, directs the mixture constituting the ink towards the transverse filter 40. The duct 43 directs the filtrate obtained towards the ink emission nozzle. The solid phase of this mixture is gradually deposited, which translates after a certain time by the clogging of the filter 40. This clogging problem is also poses with the use of pigment ink. This situation increases the pressure drop in the pipe and leads to the change of the filter or to subject this filter to a regeneration cycle.

Pour remédier à ce problème on propose, selon la présente invention, un dispositif de modulation pour tête d'impression à jet d'encre utilisant le principe de la filtration tangentielle. L'application de ce principe permet, au moment de l'ouverture de la voie purge, de maintenir le jet d'encre en marche tout en laissant circuler le fluide à débit élevé parallèlement à la surface filtrante et en particulier contre la paroi externe du filtre. Ce mouvement de balayage en phase de rafraíchissement lave en permanence la surface du filtre et empêche le dépôt de particules.To remedy this problem we propose, according to the present invention, a modulation device for inkjet print head using the principle of tangential filtration. The application of this principle allows, at the time of opening the bleed path, to keep the inkjet running while letting the fluid flow at high flow parallel to the filtering surface and in particular against the outer wall of the filter. This movement of scanning in the cooling phase washes constantly the filter surface and prevents the deposition of particles.

L'invention a donc pour objet un dispositif de modulation pour tête d'impression à jet d'encre comprenant un support supportant un canon équipé d'une buse pour l'émission du jet d'encre, des moyens d'introduction d'encre sous pression, des moyens de commande du jet d'encre associés au canon, des moyens de filtration de l'encre, le canon définissant un circuit permettant la circulation de l'encre introduite dans l'ensemble jusqu'à la buse, caractérisé en ce que les moyens de filtration sont des moyens de filtration tangentielle, des moyens de purge étant prévus pour évacuer l'encre non filtrée.The subject of the invention is therefore a device modulation for inkjet print head comprising a support supporting a barrel equipped with a nozzle for the emission of the inkjet, means for introducing pressurized ink, means for inkjet control associated with the barrel, means ink filtration, the barrel defining a circuit allowing the circulation of the ink introduced overall up to the nozzle, characterized in that the filtration means are means of tangential filtration, means of purging being provided for removing unfiltered ink.

Le canon peut comprendre un corps qui est engagé dans le support de manière étanche, l'espace compris entre le corps du canon et le support constituant une chambre, les moyens de filtration séparant la chambre en une partie amont où aboutissent les moyens d'introduction d'encre et d'où partent les moyens de purge, et une partie aval communiquant avec ledit circuit d'encre du canon.The barrel may include a body which is tightly engaged in the support, the space between the barrel body and the support constituting a chamber, the filtration means separating the chamber in an upstream part where lead the means of introducing ink and where the purge means, and a downstream part communicating with said canon ink circuit.

Le dispositif de modulation selon l'invention est de préférence de forme générale cylindrique autour d'un axe qui est l'axe du jet d'encre, les moyens de filtration, dits entretoise, étant de forme tubulaire.The modulation device according to the invention is preferably generally cylindrical around an axis which is the axis of the inkjet, the means of filtration, said spacer, being of tubular shape.

Le circuit d'encre du canon est alors avantageusement constitué par un canal percé dans le corps du canon.The ink circuit of the barrel is then advantageously constituted by a channel pierced in the barrel body.

Le corps du canon peut être engagé dans le support de manière étanche grâce à deux joints expansibles sous l'effet d'une pression, montés autour du corps et situés à chaque extrémité de ladite entretoise.The barrel body can be engaged in the waterproof support thanks to two seals expandable under pressure, mounted around of the body and located at each end of said spacer.

Le canon, l'entretoise, les deux joints expansibles et un écrou d'assemblage, et éventuellement les moyens de commande du jet d'encre, peuvent être montés à part du support pour constituer un ensemble monobloc.The barrel, the spacer, the two seals expandable and an assembly nut, and possibly the ink jet control means can be mounted apart from the support to constitute a set monobloc.

L'invention sera mieux comprise et d'autres avantages et particularités apparaítront à la lecture de la description qui va suivre, donnée à titre d'exemple non limitatif, accompagnée des dessins annexés parmi lesquels :

  • la figure 1 représente, de manière schématique, un filtre de sécurité pour dispositif de modulation pour tête d'impression à jet d'encre, selon l'art connu,
  • la figure 2 représente, de manière schématique, un filtre de sécurité pour dispositif de modulation pour tête d'impression à jet d'encre, selon l'invention,
  • la figure 3 représente, en vue éclatée, un dispositif de modulation pour tête d'impression à jet d'encre selon l'art antérieur,
  • la figure 4 représente le dispositif de modulation de la figure 3 modifié selon la présente invention.
The invention will be better understood and other advantages and features will appear on reading the description which follows, given by way of nonlimiting example, accompanied by the appended drawings among which:
  • FIG. 1 schematically represents a security filter for a modulation device for an inkjet print head, according to the prior art,
  • FIG. 2 schematically represents a security filter for a modulation device for an ink jet print head, according to the invention,
  • FIG. 3 shows, in exploded view, a modulation device for an ink jet print head according to the prior art,
  • 4 shows the modulation device of Figure 3 modified according to the present invention.

Le principe de l'invention est illustré par la figure 2 qui montre un filtre 50 disposé dans l'enceinte 51 tangentiellement au flux d'encre. Le mélange constituant l'encre est introduit dans l'enceinte 51 par le conduit 52 relié à la voie pression. Une partie de ce mélange d'encre est filtrée par le filtre tangentiel 50 pour constituer le filtrat qui est dirigé, grâce au conduit 53, vers la buse d'émission d'encre. Le rétentat est évacué par le conduit 54 vers la voie purge.The principle of the invention is illustrated by Figure 2 which shows a filter 50 arranged in the enclosure 51 tangentially to the flow of ink. The mixture constituting the ink is introduced into the enclosure 51 by the conduit 52 connected to the track pressure. Part of this ink mixture is filtered by the tangential filter 50 to constitute the filtrate which is directed, through conduit 53, towards the nozzle ink emission. The retentate is evacuated by the leads 54 to the purge path.

La solution proposée par l'invention va maintenant être appliquée au dispositif de modulation divulgué par le document FR-A-2 653 063. Ce dispositif est représenté en vue éclatée à la figure 3, les éléments représentés à la partie droite de la figure se situant normalement dans le prolongement de la partie gauche supérieure.The solution proposed by the invention will now be applied to the modulation device disclosed by document FR-A-2 653 063. This device is shown in exploded view in Figure 3, the elements shown on the right side of the figure normally located in the extension of the part upper left.

Le dispositif comporte un support 1 qui est destiné à être fixé sur la structure mécanique de la tête d'impression (voir la figure 1 du document FR-A-2 653 063). Le corps 1 possède une partie tubulaire 4 d'axe confondu avec l'axe du jet d'encre. Dans cette partie tubulaire 4 vient se loger le corps 2 du canon 3 qui est une pièce de forme générale cylindrique, d'axe de révolution confondu avec l'axe de la partie tubulaire 4. Le canon 3 est percé de part en part d'un trou axial 8.The device comprises a support 1 which is intended to be fixed on the mechanical structure of the print head (see Figure 1 of the document FR-A-2 653 063). Body 1 has a part tubular 4 axis coincides with the axis of the inkjet. In this tubular part 4 the body is housed 2 of the barrel 3 which is a part of general shape cylindrical, of axis of revolution coincident with the axis of the tubular part 4. The barrel 3 is drilled through from an axial hole 8.

Le corps 2 constitue la partie inférieure du canon 3. Un épaulement 5 constitue la séparation entre le corps 2 et la partie supérieure du canon 3. Le corps 2 est pourvu d'une gorge supérieure 6 près de l'épaulement 5 et d'une gorge inférieure 7. L'extrémité inférieure 9 du corps 2 est filetée pour recevoir l'écrou 10. Des trous radiaux 11, 12 percés respectivement dans les gorges 6 et 7 assurent la communication entre le trou axial 8 et les gorges 6 et 7.The body 2 constitutes the lower part of the barrel 3. A shoulder 5 constitutes the separation between the body 2 and the upper part of the barrel 3. The body 2 is provided with an upper groove 6 near of the shoulder 5 and of a lower groove 7. The lower end 9 of the body 2 is threaded to receive the nut 10. Radial holes 11, 12 drilled respectively in grooves 6 and 7 provide the communication between the axial hole 8 and the grooves 6 and 7.

Avant d'engager le corps 2 du canon dans la partie tubulaire 4 du support 1, on enfile successivement sur le corps 2 : le joint 13 en forme de bague, l'entretoise tubulaire 14 et le joint 15 également en forme de bague. Les diamètres moyens des joints 13 et 15 correspondent au diamètre de l'entretoise 14. Ceci fait que le joint 13, l'entretoise 14 et le joint 15 constituent un empilement.Before engaging the barrel body 2 in the tubular part 4 of the support 1, we thread successively on body 2: the shaped joint 13 ring, tubular spacer 14 and seal 15 also in the shape of a ring. The average diameters of seals 13 and 15 correspond to the diameter of the spacer 14. This makes the seal 13, the spacer 14 and the seal 15 constitute a stack.

Le corps 2 du canon 3, équipé du joint 13, de l'entretoise 14 et du joint 15, étant introduit dans la partie tubulaire 4, on visse l'écrou 10 sur l'extrémité 9 du corps 2 par l'orifice inférieur de la partie tubulaire 4. Le joint 13 vient en butée sur l'épaulement 5 du canon et la pression exercée par l'écrou 10, en cours de vissage, sur le joint 15 se répercute sur le joint 13 par l'intermédiaire de l'entretoise 14. Les joints 13 et 15 sont des joints expansibles sous l'effet de la pression. Le serrage de l'écrou 10 provoque donc l'application des joints 13 et 15 sur la paroi interne de la partie tubulaire 4, assurant ainsi à la fois l'étanchéité au niveau des joints et la fixation du canon 3 sur le support 1. Il faut remarquer que l'écrou 10 ne vient pas en appui sur la partie tubulaire 4 du support. Son action ne s'exerce que sur l'empilement joint 13 - entretoise 14 - joint 15.The body 2 of the barrel 3, equipped with the seal 13, of the spacer 14 and of the seal 15, being introduced in the tubular part 4, the nut 10 is screwed onto the end 9 of the body 2 through the lower orifice of the tubular part 4. The seal 13 abuts on the shoulder 5 of the barrel and the pressure exerted by the nut 10, during screwing, on the joint 15 affects joint 13 via the spacer 14. The seals 13 and 15 are seals expandable under pressure. The tightening of nut 10 therefore causes the application of seals 13 and 15 on the inner wall of the tubular part 4, thus ensuring at the same time the sealing at the level joints and fixing the barrel 3 to the support 1. Note that the nut 10 does not come in support on the tubular part 4 of the support. His action works only on the joint stack 13 - spacer 14 - seal 15.

L'entretoise 14 est pourvue d'une gorge supérieure 16 et d'une gorge inférieure 17. Des trous 18 et 19 sont percés radialement et respectivement dans les gorges 16 et 17. Au montage, les gorges 16 et 17 de l'entretoise 14 se trouvent en vis-à-vis des gorges 6 et 7, respectivement, du corps 2.The spacer 14 is provided with a groove upper 16 and lower groove 17. Holes 18 and 19 are drilled radially and respectively in grooves 16 and 17. During assembly, grooves 16 and 17 of the spacer 14 are located opposite the grooves 6 and 7, respectively, of body 2.

Le support 4 est pourvu d'un raccord 21 d'introduction d'encre sous pression dans la partie tubulaire 4 et d'un raccord 22 permettant la purge de cette même partie tubulaire. Ces raccords 21 et 22 débouchent à proximité des gorges respectivement 16 et 17 de l'entretoise 14.The support 4 is provided with a connector 21 for introducing pressurized ink into the part tubular 4 and a connector 22 for purging of this same tubular part. These fittings 21 and 22 open near the gorges respectively 16 and 17 of the spacer 14.

Le résonateur 25, permettant de stimuler le jet d'encre, est introduit par son extrémité 24 dans le canon 3 par l'orifice supérieur du trou 8, au travers du joint 20. L'autre extrémité du résonateur se prolonge par un câble électrique 23 vers un organe de commande extérieur. Le câble 23 passe dans le trou axial 27 de la bride 28.Resonator 25, which stimulates the inkjet, is introduced by its end 24 in barrel 3 through the upper hole of the hole 8, through the seal 20. The other end of the resonator is extended by an electric cable 23 to an external control member. Cable 23 passes in the axial hole 27 of the flange 28.

La fixation du résonateur dans le canon se fait de la façon suivante. Le résonateur 25 équipé du joint 20 est enfoncé dans le trou 8 jusqu'à ce que la face inférieure du joint 20 arrive en butée sur un épaulement prévu dans le trou 8. La collerette 26 vient alors en butée sur la face supérieure du joint 20. La bride est glissée le long du câble 23 et sa partie inférieure filetée 29 se visse dans la partie supérieure taraudée du trou 8 jusqu'à venir presser le joint d'étanchéité 20.The fixing of the resonator in the barrel is done in the following way. The equipped resonator 25 of seal 20 is pressed into hole 8 until the underside of the seal 20 abuts on a shoulder provided in the hole 8. The collar 26 then comes into abutment on the upper face of the seal 20. The flange is slid along the cable 23 and its threaded lower part 29 is screwed into the part upper threaded from hole 8 until pressed the seal 20.

Le fonctionnement du dispositif s'effectue comme suit. L'encre sous pression injectée par le raccord 21 baigne l'extérieur de l'entretoise 14 et pénètre à l'intérieur par les trous 18 pour atteindre la partie externe du corps 2 du canon. L'encre passe dans les trous 11 de la gorge 6, pénètre à l'intérieur du canon en baignant le résonateur 25 et se dirige vers l'extrémité 9 du canon qui est terminée par une rondelle (non visible sur la figure 1) percée d'un trou axial servant de buse d'émission d'encre. La purge du dispositif se fait par retour de l'encre, grâce aux trous 12, dans l'espace tubulaire compris entre le corps 2 et l'entretoise 14 puis, grâce aux trous 19 de l'entretoise, dans l'espace tubulaire compris entre l'entretoise 14 et la partie tubulaire du support. L'encre est ensuite évacuée par le raccord 22.The device operates as following. The pressurized ink injected by the connection 21 bathes the outside of the spacer 14 and enters inside through holes 18 to reach the external part of the body 2 of the barrel. Ink passes in the holes 11 of the groove 6, penetrates inside of the barrel by bathing the resonator 25 and goes towards the end 9 of the barrel which is terminated by a washer (not visible in Figure 1) pierced with a axial hole serving as an ink emission nozzle. The purge of the device is done by return of the ink, thanks at the holes 12, in the tubular space between the body 2 and the spacer 14 then, thanks to the holes 19 of the spacer, in the tubular space included between the spacer 14 and the tubular part of the support. The ink is then discharged through the connector 22.

Le jet d'encre stimulé par le résonateur 25, se fait donc selon l'axe du dispositif ainsi que le figure la flèche dessinée sous l'écrou 10.The inkjet stimulated by the resonator 25, is therefore done along the axis of the device as well as the arrow drawn under the nut 10 is shown.

Des trous latéraux prévus dans l'écrou 10, le canon 3 et la bride 28 permettent d'effectuer des réglages pour obtenir le bon alignement du jet d'encre. Ces réglages sont expliqués dans le document FR-A-2 653 063.Side holes provided in the nut 10, the barrel 3 and the flange 28 make it possible to carry out adjustments to obtain the correct alignment of the inkjet. These settings are explained in the document FR-A-2 653 063.

Dans la figure 4, illustrant l'invention, les mêmes références qu'à la figure 3 représentent les mêmes éléments. Le dispositif a été représenté partiellement monté. L'entretoise de la figure 3 a été remplacée par une entretoise filtrante 30 servant à la fois d'entretoise et de filtre de sécurité.In FIG. 4, illustrating the invention, the same references as in FIG. 3 represent the same items. The device has been shown partially assembled. The spacer in Figure 3a been replaced by a filter spacer 30 used both spacer and safety filter.

Cette entretoise filtrante assure une filtration transversale de l'encre et constitue un filtre de sécurité pour le dispositif. Ce filtre est en outre lavé en permanence par l'encre qui arrive.This filtering spacer ensures transverse filtration of the ink and constitutes a safety filter for the device. This filter is further washed continuously by the incoming ink.

Une telle solution peut être adaptée à différents montages avec filtre tubulaire ou plan, tout en s'accommodant de nombreux média : tissus métalliques, toiles synthétiques et membranes.Such a solution can be adapted to different assemblies with tubular or flat filter, while accommodating many media: fabrics metallic, synthetic fabrics and membranes.

La solution proposée par la figure 4 comporte un écrou 31 différent de celui de la figure 3. L'écrou, qui comportait précédemment (voir la figure 3) un épaulement pourvu de trous pour le serrage, est modifié de sorte que son diamètre extérieur s'aligne sur celui de l'entretoise et que sa manoeuvre est réalisée à partir d'une forme hexagonale.The solution proposed by Figure 4 includes a nut 31 different from that of FIG. 3. The nut, which previously included (see Figure 3) a shoulder provided with holes for tightening, is modified so that its outside diameter aligns with that of the spacer and that its operation is carried out from a hexagonal shape.

On peut ainsi monter au préalable l'ensemble monobloc constitué par le canon, les différents joints, l'entretoise filtrante, le résonateur, la bride et l'écrou. Cet ensemble monobloc vient ensuite se glisser dans le support 1 pour y être fixé de manière étanche. Cette disposition est particulièrement avantageuse car elle permet un assemblage propre en usine, elle facilite le montage sur la tête d'impression et elle permet la mise en route du jet sans instabilité liée à une pollution éventuellement de la buse.We can thus assemble the assembly beforehand monobloc constituted by the barrel, the various seals, the filter spacer, the resonator, the flange and the nut. This monobloc assembly then comes to slip in the support 1 to be fixed there tightly. This arrangement is particularly advantageous because it allows a clean assembly in the factory, it facilitates mounting on the print head and it allows the start-up of the jet without related instability possibly pollution of the nozzle.

Claims (12)

  1. Modulating device for an ink jet printing head comprising a support (1), which supports a gun (3) equipped with a nozzle for discharging the ink jet, pressurized ink introduction means, means (25) for stimulating the ink jet associated with the gun (3) and ink filtering means, the gun defining a circuit permitting the circulation of the ink introduced into the assembly up to the nozzle, characterized in that the filtering means (30) are tangential filtering means, drainage means (22) being provided for discharging the unfiltered ink.
  2. Modulating device according to claim 1, characterized in that the gun (31) comprises a body (2),
    which is engaged tightly in the support (1), the space between the gun body and the support constituting a chamber, the filtering means (30) subdividing the chamber into an upstream part to which lead the ink introduction means and from which pass the drainage means, and a downstream part communicating with the ink circuit of the gun.
  3. Modulating device according to claim 2, characterized in that it has a generally cylindrical shape about an axis, which is the ink jet axis, the filtering means (30), called the crosspiece, being tubular.
  4. Modulating device according to claim 3, characterized in that the ink circuit of the gun is constituted by a channel made in the gun body.
  5. Modulating device according to claim 4, characterized in that the ink jet stimulating means (25) comprise a resonator introduced into the channel of the gun.
  6. Modulating device according to claim 4 or 5, characterized in that the body (2) of the gun (3) is engaged tightly in the support by means of two expansible joints (13, 15) under the effect of pressure, installed around the body and located at each end of the crosspiece (30).
  7. Modulating device according to claim 6, characterized in that the gun body (2) has a first, outer groove (6) in the vicinity of the ink introduction means (21) and a second, outer groove (7) in the vicinity of the drainage means (22), the grooves (6, 7) communicating with the channel of the body.
  8. Modulating device according to claim 6 or 7, characterized in that it has a nut (31) which, on being screwed onto the gun, exerts a pressure on the expansible joints (13, 15) by means of the crosspiece (30) and a joint translation stoppage abutment (5), the expansion of the joints ensuring sealing and fixing of the gun (3) in the support (1).
  9. Modulating device according to claim 8, characterized in that with the nut (31) screwed on the end of the gun body, the external diameter of the nut is chosen so as to be able to freely engage in the support (1), which has an access orifice for screwing down the nut.
  10. Modulating device according to one of the claims 8 or 9, characterized in that the gun (3), crosspiece (30), two expansible joints (13, 15) and nut (31) constitute a one-piece assembly ready for installation on the support (1), said assembly being obtained by assembling the components beforehand.
  11. Modulating device according to claim 10, characterized in that the one-piece assembly also incorporates ink jet stimulating means (25) rendered integral with the assembly by fixing means.
  12. Modulating device according to claim 1, characterized in that the gun (3) and the filtering means (30) form part of a one-piece assembly ready for installation on the support (1) and obtained by prior assembly.
EP96400205A 1995-01-31 1996-01-29 Security filter equipped modulation device for an ink jet printhead Expired - Lifetime EP0724960B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9501121A FR2729891B1 (en) 1995-01-31 1995-01-31 MODULATION DEVICE EQUIPPED WITH A SAFETY FILTER FOR INKJET PRINTER HEAD
FR9501121 1995-01-31

Publications (2)

Publication Number Publication Date
EP0724960A1 EP0724960A1 (en) 1996-08-07
EP0724960B1 true EP0724960B1 (en) 1998-11-25

Family

ID=9475700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400205A Expired - Lifetime EP0724960B1 (en) 1995-01-31 1996-01-29 Security filter equipped modulation device for an ink jet printhead

Country Status (9)

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US (1) US5831654A (en)
EP (1) EP0724960B1 (en)
JP (1) JPH08230211A (en)
CN (1) CN1140135A (en)
AU (1) AU692337B2 (en)
CA (1) CA2167975A1 (en)
DE (1) DE69601003T2 (en)
ES (1) ES2126982T3 (en)
FR (1) FR2729891B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1748895B1 (en) * 2004-04-30 2011-09-14 Dimatix, Inc. Droplet ejection apparatus alignment
JP4768724B2 (en) 2004-04-30 2011-09-07 フジフィルム ディマティックス， インコーポレイテッド Recirculation assembly
US7448741B2 (en) * 2004-04-30 2008-11-11 Fujifilm Dimatix, Inc. Elongated filter assembly
USD652446S1 (en) 2009-07-02 2012-01-17 Fujifilm Dimatix, Inc. Printhead assembly
USD653284S1 (en) 2009-07-02 2012-01-31 Fujifilm Dimatix, Inc. Printhead frame
US8517508B2 (en) * 2009-07-02 2013-08-27 Fujifilm Dimatix, Inc. Positioning jetting assemblies

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US4575738A (en) * 1984-07-20 1986-03-11 Tektronix, Inc. Ink jet printing apparatus having an ink pressure transient suppressor system
DE3525810A1 (en) * 1985-07-19 1987-01-22 Philips Patentverwaltung Damping and filtering element for the ink supply to an ink jet print head
JPS6364750A (en) * 1986-09-08 1988-03-23 Hitachi Ltd Head for ink jet printer
US4864329A (en) * 1988-09-22 1989-09-05 Xerox Corporation Fluid handling device with filter and fabrication process therefor
FR2653063B1 (en) * 1989-10-16 1995-10-27 Imaje INK JET PRINTING HEAD AND METHOD FOR IMPLEMENTING THIS HEAD, IN PARTICULAR FOR PRINTING LARGE DIMENSIONAL CHARACTERS.
US5063393A (en) * 1991-02-26 1991-11-05 Videojet Systems International, Inc. Ink jet nozzle with dual fluid resonances
GB2259276B (en) * 1991-09-06 1995-09-27 Linx Printing Tech Ink jet printer
US5426459A (en) * 1992-12-22 1995-06-20 Hewlett-Packard Company Combined filter/aircheck valve for thermal ink-jet pen

Also Published As

Publication number Publication date
FR2729891B1 (en) 1997-04-11
ES2126982T3 (en) 1999-04-01
DE69601003T2 (en) 1999-06-24
JPH08230211A (en) 1996-09-10
US5831654A (en) 1998-11-03
EP0724960A1 (en) 1996-08-07
AU4218796A (en) 1996-08-08
DE69601003D1 (en) 1999-01-07
FR2729891A1 (en) 1996-08-02
CN1140135A (en) 1997-01-15
AU692337B2 (en) 1998-06-04
CA2167975A1 (en) 1996-08-01

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