EP0203108A1 - Ink jet single-nozzle printing head. - Google Patents

Ink jet single-nozzle printing head.

Info

Publication number
EP0203108A1
EP0203108A1 EP85905632A EP85905632A EP0203108A1 EP 0203108 A1 EP0203108 A1 EP 0203108A1 EP 85905632 A EP85905632 A EP 85905632A EP 85905632 A EP85905632 A EP 85905632A EP 0203108 A1 EP0203108 A1 EP 0203108A1
Authority
EP
European Patent Office
Prior art keywords
deflection
drops
electrodes
support block
print head
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.)
Granted
Application number
EP85905632A
Other languages
German (de)
French (fr)
Other versions
EP0203108B1 (en
Inventor
Luc Regnault
Jean-Louis Reynaud
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 EP0203108A1 publication Critical patent/EP0203108A1/en
Application granted granted Critical
Publication of EP0203108B1 publication Critical patent/EP0203108B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • 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
    • 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
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14362—Assembling elements of heads

Definitions

  • the invention relates to a single jet inkjet print head.
  • the inkjet printing technique consists in carrying out a continuous jet of calibrated drops, supplied by a system of modulations then in electrostatic charging between these drops by means of charging electrodes, finally in deflecting each drop by means of an electric field so that if the support on which one wishes to write and the writing device are in relative displacement, one obtains the formation of an impression matrix.
  • this head is fundamental for the proper functioning of an inkjet printer. It is necessary, in particular, that the trajectory of the drops ejected at the level of the ejection nozzle is perfectly defined with respect to the charge electrodes, the deflection plates - and the support which receives the impression.
  • the printhead meeting these criteria must, in addition, be compact, require no adjustment during operation and, on the other hand, allow simple and reliable adjustments prior to start-up. Finally, this head must have great ease of access for maintenance.
  • Another object of the invention is to describe a support block for charge control electrodes and integrated deflection plates. Another object relates to a safety device limiting the current in the supply circuit of the deflection means.
  • the invention relates more precisely to a single-jet ink jet printhead of the type comprising an ink supply circuit, a signal amplifier, an ink recovery detector, means for breaking the jet and ejecting the drops, means for charging and deflecting the drops; characterized in that all of these means are made integral with a monolithic part serving on the one hand, as a base 10 for these means and on the other hand, as a housing cooperating with a cover to form the cover of the head .
  • FIG. 1 illustrates an important part of a print head 15 comprising the essential functional elements such as the means for forming and ejecting the drops, the means for charging the drops and the deflection means.
  • Figures 2 and 3 illustrate schematically the main elements described by means of Figure 1.
  • 2 u Figure 4 is an exploded view of the components constituting a print head according to the invention.
  • a print head 1 according to the invention consists of a monolithic part
  • This part 2 performs two functions: on the one hand it plays the role of hood housing, on the other hand it serves as a base for all the means ensuring the essential functions of the head: namely, in particular the
  • connection nut 101 part (partially shown).
  • the signal amplifier 40 is also found there.
  • the latter can be enclosed in a cavity (not shown) provided for this purpose in the housing 2.
  • a detector 14 for recovering the ink recovered from the gutter 7 via, the pipe 77, is also housed there.
  • This detector 14 is made integral with the monolithic part 2 by fixing means
  • the central part (M) essentially comprises the modulation means creating the breaking of the jet and the means for ejecting the drops thus created.
  • the modulation body 10 is carried by a support 13, made of insulating material which is made integral with the monolithic part 2 by a set of screws 120. Inside this modulation body, the combination of the piezoelectric transducer is introduced. electric 11 associated with its resonator 12 at the end of which is mounted the plate 20 carrying the nozzle 21. This plate 20 is made integral with the support 13, for example, by means of a screw 95, mounted perpendicularly.
  • An O-ring 210 is provided at the upper end of the resonator
  • a second O-ring 211 is also provided at the lower part of the modulation body and it seals between this body 10 and the plate 20 for nozzle holder 21.
  • the modulation body 10, according to the invention can be oriented in two perpendicular planes, at two angles (.) And (/ .. Indeed, it can rotate around a first positioning and centering axis
  • screws (85) cooperating with oblong holes (84) block the body 10 in the two planes.
  • Connections (56) connect the ink circuit to the modulation body 10.
  • the lower part (D) concerns the combination of the charging electrodes and the ink drop deflection members. More precisely and according to another important characteristic of the invention, it is a also monolithic subassembly consisting of a support block 70 on which the charge 71 and charge control 72 electrodes are mounted, thus than the left 73 and right 74 deflection plates.
  • this block-support 70 of electrodes is made of an insulating material whose dielectric characteristics and thicknesses provide between the monolithic base 2 and said electrodes a level of insulation compatible with the tensions involved at this level.
  • an isolation groove 89 and a veil 90 providing a real wall of insulation is provided on the side of the deflection electrode brought to very high voltage.
  • the charge control electrode 72 is, for example, of the type described in patent application No. 83 07 549 filed on April 29, 1983 by the Applicant. In this case, it consists of a cylindrical assembly 60 made of conductive material comprising a bore into which a second tube 62 made of insulating material is introduced.
  • This second tube 62 constitutes a sheath inside which is introduces a full cylinder 63 of conductive material.
  • a slot 65 is made through which the ink drops symbolized in broken lines pass.
  • two light-emitting diodes 86 and 87 are positioned respectively, the first within the charge electrode 71 and the second at the outlet of the charge control electrode 72.
  • the diode 86 makes it possible to visually control the quality of the formation of the drops and diode 87 to visually measure the speed of these.
  • This support block 70 of electrodes also carries the left deflection plates 73 and 74 which are for example fixed by means of screws 58.
  • deflection electrodes can be deposited on the internal wall of this support in the form of a layer of conductive material which then plays the role of the deflection plates 73 and 74 described above.
  • one of the deflection plates 73 (or layer) is brought to a high potential (of the order of 8000 volts for example) while the second deflection plate 74 (or layer) is maintained at zero potential.
  • the isolation between the support block 70 and the monolithic base 2, as well as between this block 70, the charging electrode 71, must be ensured efficient manner.
  • the thickness of the support block 70 itself made of insulating material is optimized, on the other hand, a groove 89 and a wall 90 of insulation are provided for this purpose.
  • FIG. 4 which is an exploded view of a print head according to the invention, allows to summarize all of the components and making it easy to view their assembly.
  • the monolithic part 2 is therefore found there, the wall 180 of which serves as a base for all of the elements constituting the head 1.
  • a connector 181 and its nut 101 make the external circuit 182 integral with the ink circuit.
  • a box (cavity) not shown, is provided for enclosing and shielding the signal amplifier 40.
  • the ink recovery detector 14 is made of insulating material and includes a resistor R integrated in this insulator. This resistance is connected in series in the THT circuit of the deflection plate 73 brought to the potential of 8000 V so that in the event of an incident at the level of the latter, this resistance R plays the role of current limiter.
  • Both the coaxial cable (26) and the THT circuit 27 are connected conventional manner by means of lugs 28.
  • the modulation body 10 carrying the base 20 nozzle holder 21 is orientable at two angles ( ⁇ * ) and ( ⁇ ; it is thus perfectly possible, by playing on these two degrees of freedom, to center the ink jet.
  • FIG. 4 Also shown in FIG. 4 are clearly the charge and charge control electrodes, as well as the deflection electrodes (or layer), the isolation of which is ensured by means of the groove and the isolation wall described above.
  • the lower bottom 79 of the monolithic base 2 has an orifice 97 through which the deflected drops pass before reaching the surface being marked (not shown in the figure).
  • the recovery gutter 7 is hooked by means of a flange 107.
  • a cover 130 is made integral with the monolithic base 2 by means of clips
  • Such a print head is compact, easy to adjust and finds its application in inkjet printers with a single nozzle.

Landscapes

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

Abstract

Dans une telle tête, tous les éléments essentiels sont rendus solidaires d'une pièce monolithique (2) jouant la fonction d'embase. De plus, le corps de modulation (10) coopère avec des moyens de réglage (vis 84 et trous oblongs 85) selon deux angles (alpha) et ($(b)), situés dans deux plans perpendiculaires. Enfin, les électrodes de charge (71) de contrôle de charge (72) et de déflexion (73, 74) sont solidaires d'un bloc (70). L'isolement électrique est assuré grâce notamment à une gorge (89) et à un voile (90) d'isolement qui évite toute formation d'arc. L'invention s'applique à toute imprimante à jet d'encre.In such a head, all the essential elements are made integral with a monolithic part (2) acting as a base. In addition, the modulation body (10) cooperates with adjustment means (screws 84 and oblong holes 85) at two angles (alpha) and ($(b)), located in two perpendicular planes. Finally, the charge electrodes (71) for charge control (72) and deflection (73, 74) are integral with a block (70). Electrical insulation is ensured in particular by a groove (89) and an insulation veil (90) which prevents any arc formation. The invention applies to any inkjet printer.

Description

TETE D'IMPRESSION MONOBUSE A JET D'ENCRE INK JET SINGLE JET PRINTHEAD
L'invention concerne une tête d'impression monobuse à jet d'encre.The invention relates to a single jet inkjet print head.
La technique d'impression à jet d'encre consiste à réaliser un jet continu de gouttes calibrées, fournies par un système de modulations puis à charger électrostatique ent ces gouttes au moyen d'électrodes de charge, enfin à dévier chaque goutte au moyen d'un champ électrique de telle sorte que si le support sur lequel on désire écrire et le dispositif d'écriture sont en déplacement relatif, on obtient la formation d'une matrice d'impres¬ sion.The inkjet printing technique consists in carrying out a continuous jet of calibrated drops, supplied by a system of modulations then in electrostatic charging between these drops by means of charging electrodes, finally in deflecting each drop by means of an electric field so that if the support on which one wishes to write and the writing device are in relative displacement, one obtains the formation of an impression matrix.
Dans une imprimante à jet d'encre, les fonctions énoncées ci-dessus à savoir la fragmentation du jet en gouttes calibrées, leur charge électro- statique et leur déflexion sont obtenues au moyen d'un dispositif appelé tête d'impression dans la suite de la description.In an inkjet printer, the functions set out above, namely the fragmentation of the jet into calibrated drops, their electrostatic charge and their deflection are obtained by means of a device called a print head in the following. the description.
Le rôle de cette tête est fondamental pour le bon fonctionnement d'une imprimante à jet d'encre. Il faut, notamment, que la trajectoire des gouttes éjectées au niveau de la buse d'éjection soit parfaitement définie par rapport aux électrodes de charge, aux plaques de déflexion - et au support qui reçoit l'impression. La tête d'impression répondant à ces critères doit, en plus, être peu encombrante n'exiger aucun réglage en cours de fonctionnement et permettre en revanche des réglages simples et fiables préalablement à la mise en route. Enfin, il faut que cette tête présente une grande facilité d'accès pour la maintenance.The role of this head is fundamental for the proper functioning of an inkjet printer. It is necessary, in particular, that the trajectory of the drops ejected at the level of the ejection nozzle is perfectly defined with respect to the charge electrodes, the deflection plates - and the support which receives the impression. The printhead meeting these criteria must, in addition, be compact, require no adjustment during operation and, on the other hand, allow simple and reliable adjustments prior to start-up. Finally, this head must have great ease of access for maintenance.
Une tête d'impression répondant à ces critères a été décrite dans une demande de brevet français 83 03 975 déposée le 7 mars 1983 par la Demanderesse. Dans cette tête d'impression les moyens de brisure du jet et d'éjection des gouttes sont solidaires du boîtier du capot et les moyens de charge et de déflexion sont solidaires du couvercle dudit capot.A printhead meeting these criteria has been described in a French patent application 83 03 975 filed on March 7, 1983 by the Applicant. In this printhead, the means for breaking the jet and for ejecting the drops are secured to the cover housing and the charging and deflection means are secured to the cover of said cover.
Dans la présente demande, en revanche tous ces éléments essentiels de la tête d'impression, sont rendus solidaires d'une seule et même pièce monolitique, cette architecture contribuant à réduire l'encombrement de l'ensemble sans nuire aux facilités de réglage, ni aux conditions d'iso¬ lement, notamment des électrodes de déflexion.In the present application, however, all of these essential elements of the print head are made integral with one and the same monolithic part, this architecture helping to reduce the overall dimensions of the assembly without adversely affecting the adjustment facilities, nor under isolation conditions, in particular deflection electrodes.
Un autre objet de l'invention est de décrire un bloc-support des électrodes de contrôle de charge et de plaques des déflexions intégrées. Un autre objet concerne un dispositif de sécurité limitant le courant dans le circuit d'alimentation des moyens de déflexion.Another object of the invention is to describe a support block for charge control electrodes and integrated deflection plates. Another object relates to a safety device limiting the current in the supply circuit of the deflection means.
L'invention concerne plus précisément une tête d'impression mono- 5 buse à jet d'encre du type comportant un circuit d'alimentation en encre, un amplificateur de signal, un détecteur de récupération d'encre, des moyens de brisure du jet et d'éjection des gouttes, des moyens de charge et de déflexion des gouttes ; caractérisé en ce que l'ensemble de ces moyens est rendu solidaire d'une pièce monolitique servant d'une part, d'embase 10 pour ces moyens et d'autre part, de boîtier coopérant avec un couvercle pour former le capot de la tête.The invention relates more precisely to a single-jet ink jet printhead of the type comprising an ink supply circuit, a signal amplifier, an ink recovery detector, means for breaking the jet and ejecting the drops, means for charging and deflecting the drops; characterized in that all of these means are made integral with a monolithic part serving on the one hand, as a base 10 for these means and on the other hand, as a housing cooperating with a cover to form the cover of the head .
L'invention sera mieux comprise à l'aide des explications qui vont t suivre et des figures jointes, parmi lesquelles :The invention will be better understood with the aid of the explanations which will follow and of the appended figures, among which:
La figure 1 illustre une partie importante d'une tête d'impression 15 comportant les éléments fonctionnels essentiels tels que les moyens de formation et d'éjection des gouttes, les moyens de charge des gouttes et les moyens de déflexion.FIG. 1 illustrates an important part of a print head 15 comprising the essential functional elements such as the means for forming and ejecting the drops, the means for charging the drops and the deflection means.
Les figures 2 et 3 illustrent schématiquemeπt les principaux éléments décrits au moyen de la figure 1. 2 u La figure 4 est une vue éclatée des composants constituant une tête d'impression conforme à l'invention.Figures 2 and 3 illustrate schematically the main elements described by means of Figure 1. 2 u Figure 4 is an exploded view of the components constituting a print head according to the invention.
Pour plus de clarté, les mêmes éléments portent les mêmes réfé¬ rences dans toutes les figures.For clarity, the same elements have the same references in all the figures.
Comme le montre la figure 1 complétée par les figures 2 et 3As shown in Figure 1 supplemented by Figures 2 and 3
25 auxquelles se réfère simultanément la suite de la description, une tête d'impression 1 conforme à l'invention est constituée d'une pièce monolitique25 to which the rest of the description refers simultaneously, a print head 1 according to the invention consists of a monolithic part
2. Cette pièce 2 accomplit deux fonctions : d'une part elle joue le rôle de boîtier de capot, d'autre part elle sert d'embase pour tous les moyens assurant les fonctions essentielles de la tête : à savoir, notamment les2. This part 2 performs two functions: on the one hand it plays the role of hood housing, on the other hand it serves as a base for all the means ensuring the essential functions of the head: namely, in particular the
"-O moyens de formation et de l'éjection des gouttes, de leur charge et de leur déflexion. Un couvercle ferme le boîtier mais il n'a, contrairement à ce qui se passe dans le cas de la tête d'impression objet de la demande de brevet citée précédemment, d'autres fonctions que celle de fermer le boîtier, tout en permettant lorsqu'il est ouvert, d'examiner la combinaison"-O means for forming and ejecting the drops, their charge and their deflection. A cover closes the casing but, unlike what happens in the case of the print head which is the object of the patent application cited above, other functions than that of closing the case, while allowing when open, to examine the combination
*-*5 des moyens énumérés ci-dessus.* - * 5 of the means listed above.
Ces derniers sont tous représentés sur la figure 1, où ne manque que l'environnement complémentaire qui n'est pas directement en relation avec l'invention.These are all shown in Figure 1, where only the complementary environment is missing which is not directly related with the invention.
Dans la partie haute (A) on trouve notamment l'arrivée du circuit d'alimentation en encre 100 rendue solidaire de la tête 1 au moyen d'un écrou de raccordement 101 (partiellement représenté). On y trouve également l'amplificateur de signal 40. Ce dernier peut être enfermé dans une cavité (non représentée) prévue à cet effet dans le boîtier 2.In the upper part (A) there is in particular the arrival of the ink supply circuit 100 made integral with the head 1 by means of a connection nut 101 (partially shown). The signal amplifier 40 is also found there. The latter can be enclosed in a cavity (not shown) provided for this purpose in the housing 2.
Enfin un détecteur de récupération 14 de l'encre récupérée au niveau de la gouttière 7 via, la conduite 77, s'y trouve également logé. Ce détecteur 14 est rendu solidaire de la pièce monolitique 2 par des moyens de fixationFinally, a detector 14 for recovering the ink recovered from the gutter 7 via, the pipe 77, is also housed there. This detector 14 is made integral with the monolithic part 2 by fixing means
45 et comporte de manière intégrée, une résistance R qui accomplit une fonction de limiteur de courant comme cela sera expliqué plus loin.45 and includes, in an integrated manner, a resistor R which performs a current limiter function as will be explained below.
La partie centrale (M) comporte essentiellement les moyens de modulation créant la brisure du jet et les moyens d'éjections des gouttes ainsi créées.The central part (M) essentially comprises the modulation means creating the breaking of the jet and the means for ejecting the drops thus created.
Le corps de modulation 10 est porté par un support 13, réalisé en matière isolante qui est rendu solidaire de la pièce monolitique 2 par un jeu de vis 120. A l'intérieur de ce corps de modulation, est introduite la combinaison du transducteur piezo-électrique 11 associé à son resonnateur 12 à l'extrémité duquel est montée la platine 20 portant la buse 21. Cette platine 20 est rendue solidaire du support 13, par exemple, au moyen d'une vis 95, montée perpendiculairement.The modulation body 10 is carried by a support 13, made of insulating material which is made integral with the monolithic part 2 by a set of screws 120. Inside this modulation body, the combination of the piezoelectric transducer is introduced. electric 11 associated with its resonator 12 at the end of which is mounted the plate 20 carrying the nozzle 21. This plate 20 is made integral with the support 13, for example, by means of a screw 95, mounted perpendicularly.
Un joint torique 210 est prévu à l'extrémité haute du resonnateurAn O-ring 210 is provided at the upper end of the resonator
12. Il assure en combinaison avec un presse-étoupe 110, l'étanchéité à ce niveau. Un second joint torique 211 est également prévu à la partie basse du corps de modulation et il assure l'étanchéité entre ce corps 10 et la platine 20 porte-buse 21.12. In combination with a cable gland 110, it ensures sealing at this level. A second O-ring 211 is also provided at the lower part of the modulation body and it seals between this body 10 and the plate 20 for nozzle holder 21.
Le corps de modulation 10, selon l'invention, peut être orienté dans deux plans perpendiculaires, selon deux angles ( . ) et (/ .. En effet, il peut tourner autour d'un premier axe de positionnement et de centrageThe modulation body 10, according to the invention, can be oriented in two perpendicular planes, at two angles (.) And (/ .. Indeed, it can rotate around a first positioning and centering axis
80 lui donnant le degré de liberté selon (p), et autour d'un second pion80 giving it the degree of freedom according to (p), and around a second pawn
(16), lui donnant le degré de liberté, selon («-).(16), giving it the degree of freedom, according to (“-).
Lorsque le positionnement correct du corps de modulation et donc du jet est obtenu, des vis (85) coopérant avec des trous oblongs (84) bloquent, dans les deux plans le corps 10.When the correct positioning of the modulation body and therefore of the jet is obtained, screws (85) cooperating with oblong holes (84) block the body 10 in the two planes.
Des raccords (56) relient le circuit de l'encre au corps de modulation 10. La partie basse (D) concerne la combinaison des électrodes de charge et des organes de déflexion des gouttes d'encre. Plus précisément et selon une autre caractéristique importante de l'invention, il a'agit d'un sous- ensemble également monolitique constitué d'un bloc-support 70 sur lequel sont montées les électrodes de charge 71 et de contrôle de charge 72, ainsi que les plaques de déflexion gauche 73 et droite 74.Connections (56) connect the ink circuit to the modulation body 10. The lower part (D) concerns the combination of the charging electrodes and the ink drop deflection members. More precisely and according to another important characteristic of the invention, it is a also monolithic subassembly consisting of a support block 70 on which the charge 71 and charge control 72 electrodes are mounted, thus than the left 73 and right 74 deflection plates.
Selon une autre caractéristique importante de l'invention, ce bloc- support 70 d'électrodes, est réalisé en un matériau isolant dont les caracté¬ ristiques diélectriques et les épaisseurs assurent entre l'embase monolitique 2 et lesdites électrodes, un niveau d'isolement compatible avec les tensions mises en jeu à ce niveau. De plus, pour éviter la formation d'arcs, une gorge d'isolement 89 ainsi qu'un voile 90 assurant un véritable mur d'iso¬ lement est prévu du côté de l'électrode de déflexion portée à très haute tension. L'électrode de contrôle de charge 72 est, par exemple, du type de celle qui est décrite dans la demande de brevet n° 83 07 549 déposée le 29 avril 1983 par la Demanderesse. Elle est constituée dans ce cas d'un ensemble cylindrique 60 en matériau conducteur comportant un alésage dans lequel est introduit un second tube 62 réalisé en matériau isolant. Ce dernier est introduit dans le cylindre 60 de telle sorte que sa surface externe soit en contact parfait avec la surface interne du cylindre 60 sur une longueur déterminée inférieure à celle du cylindre 60. Ce second tube 62 constitue un fourreau à l'intérieur duquel est introduit un cylindre plein 63 en matériau conducteur. Dans cet ensemble on pratique une fente 65 à travers laquelle transitent les gouttes d'encre symbolisées en traits interrompus.According to another important characteristic of the invention, this block-support 70 of electrodes is made of an insulating material whose dielectric characteristics and thicknesses provide between the monolithic base 2 and said electrodes a level of insulation compatible with the tensions involved at this level. In addition, to avoid the formation of arcs, an isolation groove 89 and a veil 90 providing a real wall of insulation is provided on the side of the deflection electrode brought to very high voltage. The charge control electrode 72 is, for example, of the type described in patent application No. 83 07 549 filed on April 29, 1983 by the Applicant. In this case, it consists of a cylindrical assembly 60 made of conductive material comprising a bore into which a second tube 62 made of insulating material is introduced. The latter is introduced into the cylinder 60 so that its external surface is in perfect contact with the internal surface of the cylinder 60 over a determined length less than that of the cylinder 60. This second tube 62 constitutes a sheath inside which is introduces a full cylinder 63 of conductive material. In this assembly, a slot 65 is made through which the ink drops symbolized in broken lines pass.
Selon une caractéristique de la présente invention, deux diodes 86 et 87 électroluminescentes, sont positionnées respectivement, la pre¬ mière au sein même de l'électrode de charge 71 et la seconde à la sortie de l'électrode de contrôle de charge 72. La diode 86 permet de contrôler visuellement la qualité de la formation des gouttes et la diode 87 de mesurer visuellement la vitesse de celles-ci.According to a characteristic of the present invention, two light-emitting diodes 86 and 87 are positioned respectively, the first within the charge electrode 71 and the second at the outlet of the charge control electrode 72. The diode 86 makes it possible to visually control the quality of the formation of the drops and diode 87 to visually measure the speed of these.
Ce bloc-support 70 d'électrodes porte également les plaques de déflexion gauche 73 et 74 qui sont par exemple fixées au moyen de vis 58. Cependant selon une caractéristique importante de l'invention, compte tenu de la géométrie de ce bloc-support 70 et de sa structure, des électrodes de déflexion peuvent être déposées sur la paroi interne de ce support sous la forme d'une couche d'un matériau conducteur qui joue alors le rôle des plaques de déflexion 73 et 74 décrites précédemment. Conformément à l'invention, l'une des plaques 73 (ou couche) de déflexion, est portée à un potentiel élevé (de l'ordre de 8000 volts par exemple) tandis que la seconde plaque 74 (ou couche) de déflexion est maintenue au potentiel zéro.This support block 70 of electrodes also carries the left deflection plates 73 and 74 which are for example fixed by means of screws 58. However according to an important characteristic of the invention, account given the geometry of this support block 70 and its structure, deflection electrodes can be deposited on the internal wall of this support in the form of a layer of conductive material which then plays the role of the deflection plates 73 and 74 described above. According to the invention, one of the deflection plates 73 (or layer) is brought to a high potential (of the order of 8000 volts for example) while the second deflection plate 74 (or layer) is maintained at zero potential.
Comme cela a déjà été dit précédemment, compte tenu de ces contraintes électriques, l'isolement entre le bloc-support 70 et l'embase monolitique 2, ainsi qu'entre ce bloc 70, l'électrode de charge 71, doit être assurée de manière efficace. Pour accomplir cette fonction, d'une part l'épaisseur du bloc-support 70 réalisé lui-même en matériau isolant est optimisé, d'autre part, une gorge 89 et un mur 90 d'isolement sont prévus à cet effet.As has already been said previously, taking into account these electrical constraints, the isolation between the support block 70 and the monolithic base 2, as well as between this block 70, the charging electrode 71, must be ensured efficient manner. To accomplish this function, on the one hand the thickness of the support block 70 itself made of insulating material is optimized, on the other hand, a groove 89 and a wall 90 of insulation are provided for this purpose.
Un moyen de réglage 57 glissant latéralement sur deux pions 810, assure le positionnement par translation (7* ) du bloc-support 70 et permet de positionner les deux plaques ou couche de déflexion, parfaitement par rapport au jet de gouttes. ^ La figure 4 qui est une vue éclatée d'une tête d'impression conforme à l'invention, permet de récapituler l'ensemble des composants la constituant et de bien visualiser leur montage.An adjustment means 57 sliding laterally on two pins 810, ensures the positioning by translation (7 * ) of the support block 70 and makes it possible to position the two plates or deflection layer, perfectly relative to the jet of drops. ^ Figure 4 which is an exploded view of a print head according to the invention, allows to summarize all of the components and making it easy to view their assembly.
On y retrouve donc la pièce monolitique 2 dont la paroi 180 sert d'embase à l'ensemble des éléments constituant la tête 1. Un raccord 181 et son écrou 101 rendent solidaire du fond supérieur 182 le circuit externe de l'encre. Sur cette paroi 180, une boîte (cavité) non représentée, est prévue pour enfermer et blinder l'amplificateur de signal 40. A ce niveau se trouve également logé, le détecteur de récupération de l'encre 14. Selon une caractéristique importante de l'invention, comme cela a été dit précédemment, ce détecteur 14 est réalisé en matériau isolant et comporte une résistance R intégrée dans cet isolant. Cette résistance est montée en série dans le circuit THT de la plaque de déflexion 73 portée au potentiel de 8000 V de telle sorte qu'en cas d'incident au niveau de cette dernière, cette résistance R joue le rôle de limiteur de courant.The monolithic part 2 is therefore found there, the wall 180 of which serves as a base for all of the elements constituting the head 1. A connector 181 and its nut 101 make the external circuit 182 integral with the ink circuit. On this wall 180, a box (cavity) not shown, is provided for enclosing and shielding the signal amplifier 40. At this level is also housed, the ink recovery detector 14. According to an important characteristic of the invention, as said previously, this detector 14 is made of insulating material and includes a resistor R integrated in this insulator. This resistance is connected in series in the THT circuit of the deflection plate 73 brought to the potential of 8000 V so that in the event of an incident at the level of the latter, this resistance R plays the role of current limiter.
Le câble coaxial (26) comme le circuit THT 27 sont connectés de manière classique au moyen de cosses 28.Both the coaxial cable (26) and the THT circuit 27 are connected conventional manner by means of lugs 28.
Selon une caractéristique importante de l'invention comme cela a déjà été dit précédemment et qui est particulièrement illustrée au moyen de cette figure 4, le corps de modulation 10 portant l'embase 20 porte- buse 21 est orientable selon deux angles (<* ) et (β ; on peut ainsi parfaite¬ ment, en jouant sur ces deux degrés de liberté, centrer le jet d'encre.According to an important characteristic of the invention as has already been said previously and which is particularly illustrated by means of this FIG. 4, the modulation body 10 carrying the base 20 nozzle holder 21 is orientable at two angles (< * ) and (β; it is thus perfectly possible, by playing on these two degrees of freedom, to center the ink jet.
Sur cette figure 4 apparaissent également clairement, les électrodes de charge et de contrôle de charge, ainsi que les électrodes (ou couche) de déflexion dont l'isolement est assuré au moyen de la gorge et du mur d'isolement décrit précédemment.Also shown in FIG. 4 are clearly the charge and charge control electrodes, as well as the deflection electrodes (or layer), the isolation of which is ensured by means of the groove and the isolation wall described above.
Le fond inférieur 79 de l'embase monolitique 2 comporte un orifice 97 à travers lequel transitent les gouttes déviées avant d'atteindre la surface en cours de marquage (non représentée sur la figure). La gouttière 7 de récupération est accrochée au moyen d'une bride 107. Enfin un couver- cle 130 est rendu solidaire de l'embase monolitique 2 au moyen de clipsThe lower bottom 79 of the monolithic base 2 has an orifice 97 through which the deflected drops pass before reaching the surface being marked (not shown in the figure). The recovery gutter 7 is hooked by means of a flange 107. Finally a cover 130 is made integral with the monolithic base 2 by means of clips
131 formant ainsi un capotage constituant l'enveloppe externe, protégeant la tête d'impression 1.131 thus forming a cover constituting the external envelope, protecting the print head 1.
Une telle tête d'impression est compacte, facile à régler et trouve son application dans les imprimantes à jet d'encre à tête monobuse. Such a print head is compact, easy to adjust and finds its application in inkjet printers with a single nozzle.

Claims

REVENDICATIONS
1) Tête d'impression monobuse (1) à jet d'encre du type comportant un circuit d'alimentation (100), des moyens de brisure du jet et d'éjection des gouttes, des moyens de charge et de déflexion de celles-ci; caractérisée en ce qu'un amplificateur de signal (40), un corps de modulation (10) orientable selon deux angles (•*-*•*' ) et ( /_) dans deux plans perpendiculaires, un bloc-support (70) dans lequel sont intégrées l'électrode de charge (71), àe contrôle de charge (72) et les électrodes de déflexion (73) et (74), sont montés sur une pièce monolitique (2), cette dernière servant à la fois de blindage à l'amplificateur (40) et de support au corps de modulation (10) et au bloc-support (70).1) Single nozzle inkjet print head (1) of the type comprising a supply circuit (100), means for breaking the jet and ejecting the drops, means for charging and deflecting them this; characterized in that a signal amplifier (40), a modulation body (10) orientable at two angles ( • * - * • * ') and (/ _) in two perpendicular planes, a support block (70) in which the charge electrode (71), with charge control (72) and the deflection electrodes (73) and (74) are integrated, are mounted on a monolithic part (2), the latter serving both shielding to the amplifier (40) and support to the modulation body (10) and to the support block (70).
2) Tête d'impression selon la revendication 1, caractérisée en ce que des moyens de réglage selon (tr) permettent, par translation selon (tr), de positionner dans l'axe du jet le bloc-support (70) supportant les électrodes de charge et de déflexion des gouttes. 3) Tête d'impression selon l'une des revendications précédentes, caractérisée en ce qu'une gorge (89) et un voile (90) assurent l'isolement de la plaque de déflexion chargée (73).2) print head according to claim 1, characterized in that adjustment means according to (tr) allow, by translation along (tr), to position in the axis of the jet the support block (70) supporting the electrodes load and deflection of the drops. 3) Printhead according to one of the preceding claims, characterized in that a groove (89) and a veil (90) ensure the isolation of the loaded deflection plate (73).
4) Tête d'impression selon l'une des revendications précédentes, caractérisée en ce que deux diodes électroluminescentes (86) et (87) sont intégrées dans le bloc-support (70), la première au niveau de l'électrode de charge (71) pour contrôler visuellement la formation des gouttes, l'autre au niveau de l'électrode de contrôle de charge (72) pour contrôler visuellement la vitesse de ces gouttes.4) Printhead according to one of the preceding claims, characterized in that two light-emitting diodes (86) and (87) are integrated in the support block (70), the first at the charge electrode ( 71) to visually control the formation of the drops, the other at the charge control electrode (72) to visually control the speed of these drops.
5) Tête d'impression selon l'une des revendications précédentes caractérisée en ce que ces deux électrodes (73) et (74) sont constituées par deux couches métalliques déposées sur la paroi interne du bloc-support (70).5) Printhead according to one of the preceding claims characterized in that these two electrodes (73) and (74) are constituted by two metal layers deposited on the internal wall of the support block (70).
6) Tête d'impression selon l'une des revendications précédentes, caractérisée en ce que l'une des électrodes de déflexion (73) est portée à un très haut potentiel, la seconde électrode (74) étant maintenue au potentiel zéro.6) Printhead according to one of the preceding claims, characterized in that one of the deflection electrodes (73) is brought to a very high potential, the second electrode (74) being maintained at zero potential.
7) Tête d'impression selon l'une des revendications précédentes, caractérisée en ce qu'elle comporte une électrode de contrôle de charge intégrée au bloc supportant l'électrode de charge (71) et les plaques de déflexion (73) et (74).7) Print head according to one of the preceding claims, characterized in that it comprises a charge control electrode integrated in the block supporting the charge electrode (71) and the deflection plates (73) and (74).
8) Tête d'impression selon l'une des revendications précédentes, caractérisée en ce qu'un détecteur d'encre placé dans le circuit de récupération de l'encre (77) relié à la gouttière (7) comporte une résistance (R) montée en série dans le circuit de mise en tension des électrodes de déflexion (73) et (74). 8) Print head according to one of the preceding claims, characterized in that an ink detector placed in the ink recovery circuit (77) connected to the gutter (7) comprises a resistance (R) mounted in series in the tensioning circuit of the deflection electrodes (73) and (74).
EP85905632A 1984-11-13 1985-11-07 Ink jet single-nozzle printing head Expired - Lifetime EP0203108B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8417404 1984-11-13
FR8417404A FR2573008B1 (en) 1984-11-13 1984-11-13 INK JET SINGLE JET PRINTHEAD

Publications (2)

Publication Number Publication Date
EP0203108A1 true EP0203108A1 (en) 1986-12-03
EP0203108B1 EP0203108B1 (en) 1990-02-28

Family

ID=9309608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905632A Expired - Lifetime EP0203108B1 (en) 1984-11-13 1985-11-07 Ink jet single-nozzle printing head

Country Status (8)

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US (1) US4743922A (en)
EP (1) EP0203108B1 (en)
JP (1) JPS62500779A (en)
AU (1) AU580819B2 (en)
CA (1) CA1264984A (en)
DE (1) DE3576140D1 (en)
FR (1) FR2573008B1 (en)
WO (1) WO1986002885A1 (en)

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Also Published As

Publication number Publication date
EP0203108B1 (en) 1990-02-28
AU5068685A (en) 1986-06-03
US4743922A (en) 1988-05-10
JPS62500779A (en) 1987-04-02
AU580819B2 (en) 1989-02-02
WO1986002885A1 (en) 1986-05-22
CA1264984A (en) 1990-01-30
FR2573008A1 (en) 1986-05-16
DE3576140D1 (en) 1990-04-05
FR2573008B1 (en) 1988-01-08

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