EP0135558A1 - Ink jet printing head and printer provided therewith. - Google Patents

Ink jet printing head and printer provided therewith.

Info

Publication number
EP0135558A1
EP0135558A1 EP84900990A EP84900990A EP0135558A1 EP 0135558 A1 EP0135558 A1 EP 0135558A1 EP 84900990 A EP84900990 A EP 84900990A EP 84900990 A EP84900990 A EP 84900990A EP 0135558 A1 EP0135558 A1 EP 0135558A1
Authority
EP
European Patent Office
Prior art keywords
base
head according
modulation
ejection head
jet
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
EP84900990A
Other languages
German (de)
French (fr)
Other versions
EP0135558B1 (en
Inventor
Jean-Claude Millet
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 EP0135558A1 publication Critical patent/EP0135558A1/en
Application granted granted Critical
Publication of EP0135558B1 publication Critical patent/EP0135558B1/en
Expired 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
    • 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
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/14—Mounting head into the printer

Definitions

  • the invention relates to an ink jet print head.
  • the inkjet printing technique consists in carrying out a continuous jet of calibrated drops, supplied by a modulation system, then in electrostatically charging these drops by means of charging electrodes,,. finally to deflect 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 a printing matrix.
  • the role of this head is fundamental for the proper functioning of an inkjet printer. It is necessary, in particular, that the drops trajectory ejected to "the ejection nozzle level is perfectly defined _ relative to the charging electrodes, the deflection plate and the support which receives the impression.
  • the printhead responsive these criteria must, in addition, be space-saving, require no adjustment during operation and, on the other hand, allow simple and reliable adjustments prior to start-up.
  • this head must be very easy
  • the object of the present invention is precisely to produce a printhead whose architecture enables it to meet all these requirements, and more specifically relates to an inkjet printhead comprising in particular modulation means capable of breaking the jet; means for ejecting the calibrated drops; means for electrostatically charging these drops and deflection means, this head being characterized in that the modulation and ejection means are integrated in a first modulation element and the charging and deflection means are integrated in a second element called the electrode holder, the first and the second element being respectively secured to a case and the cover of this case.
  • FIG. 1 schematically shows the main elements of a print head according to the invention.
  • a print head according to the invention consists essentially of a modulation element 1; an electrode holder element 2 supporting the charge electrodes 3 and 4 as well as the deflection plates 5 and 6.
  • a system of solenoid valves 5 intended to regulate the supply of liquid as well as a gutter holder 7 supporting a gutter 66 intended to collect the drops not used for printing are also integrated into the print head.
  • housing S whose cover 9 is made in two parts: one upper 10 is said to be fixed and the other 'lower 11 is said to be mobile.
  • the housing 8 and its cover 9 perform two functions: that of rollover and that of holding in place the essential elements listed above.
  • This housing S cooperates indeed with the new architecture of these elements to ensure obtaining, on the one hand, the optimal location of the jet break, on the other hand, the perfect centering of the jet.
  • Such a constructive arrangement of the printhead, in accordance with the invention is particularly advantageous for the implementation of the ink jet printing process as is explained in more detail below by means of FIG.
  • the housing 8 which constitutes a first support for the essential elements listed above is called support housing 8 in the following description. It comprises a bottom 13, a lower base 14, an upper base 15 and two side walls 16 and 17.
  • the system of solenoid valves 5 is introduced into the support housing 8 to which it is fixed by any means known per se.
  • the electrical connection devices, the fluid supply pipes, the safety relays and in general all the complementary environment which is not directly related to the invention is not shown. These are conventional technical means; only their passage 18 in the upper base 15 is shown.
  • the lower base 14 has an orifice 190 through which the calibrated, charged and deflected drops pass through in the direction of the substrate to be printed (not shown).
  • the modulation element 1 essentially consists of a base 19 comprising a bore 20 of diameter D, into which the modulation body 21 is introduced. well said. It may for example be a vibratory device with pie z o-electric elements as described in French patent EN 7923934 filed on 09.29.79, published under No. 2,465,528 and the holder of which is the plaintiff.
  • the modulation body 21 carries at its base a cylindrical plate 22 fixed by at least three fixing points 25 forming an angle .s between them.
  • This plate 22 carries a nozzle 23 consisting for example of a ruby pierced with an orifice 24 for ejecting the jet of drops, the path of which is symbolized by the axes XY and X'Y '; the base 19 of the modulation element 1 is made integral with the bottom 13 of the support housing 8, as shown in FIG. 2 by any known means, for example a screw 26.
  • the faces 28 of the base are made integral with the bottom 13 of the support housing 8, as shown in FIG. 2 by any known means, for example a screw 26.
  • L base 19, support of the modulation body 21 further comprises a recess 31, provided with a bore 32 capable of receiving an axis 34.
  • the fixed upper part 10 of the cover 9 is put in place, the profile of which also has a recess 35 which frees space for the ends of the axis 34 intended to be in turn threaded into a bore 36 formed in the part 11 of the cover 9 as will be explained below.
  • a second extremely important element of the invention and don t cooperation with the modulation element 1 is essential for the proper functioning of the print head is constituted by the electrode holder element 2.
  • This essentially comprises a support body 40 in which are embedded and fixed the charge electrode 3 and the charge control electrode 4, and which receives by fixing the set of deflection plates 5 and 6.
  • the two electrodes 3 and 4 are provided each of a calibrated slot 41 and 42 through which the jet of drops supplied by the modulation element 1 and passes. the nozzle 24, before crossing the space which separates the two deflection plates 5 and 6.
  • the slots 41 and 42 produced in these electrodes and the bearing faces of the deflection plates are by construction strictly parallel.
  • the electrode holder element 2 is made integral with the lower part 11 of the cover 9 intended to close the support box 8, previously fitted with the modulation element 1. This connection is carried out
  • the lower part 11 of the cover 9 is immobilized by means, for example, of a soft nut
  • modulation body 21 since 5 it is possible to orient the modulation body 21 in rotation inside the modulation base 19, it is certain to be able, by the combination of the two combined actions at the level of the nozzle holder plate 22 and of the body. modulation 21 to satisfy a fundamental condition, namely: putting the jet in a plane parallel to the faces of the charge electrodes
  • the jet is centered by means of a centering means 50.
  • the charging electrode 3 must be located at a determined distance from the precise place where the jet breaks up into droplets, in this case
  • the gutter 66 is also fixed to the lower base of the housing 8. Its role is to collect the drops not used for printing.
  • a print head according to the invention can be fitted to all types of printers of the so-called continuous ink jet type.
  • maintenance is particularly facilitated because of the possible opening of the cover 9, the lower part 11 of which can undergo rotation around the axis 34.
  • the substrate to be printed is placed facing the passage 190 formed in the lower base 14 of the housing 8 and perpendicular to the xy axis of the jet defined above.

Landscapes

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

Abstract

Tête d'impression à jet d'encre qui comporte essentiellement un premier élément de modulation (1) dans lequel sont intégrés dans une embase (19) le corps de modulation (31) et une plaque cylindrique orientable (22) portant les moyens d'éjection, capable de permettre l'optimisation de la perpendicularité de jet. Elle comporte également un second élément porte-électrodes (2) constitué d'un support (40). Le premier et le second éléments sont rendus solidaires respectivement du boitier (8) et d'une partie mobile (11) du couvercle (9). Un axe (34) permet l'articulation de cette partie (11) du couvercle (9) par rapport à l'embase (19). Des moyens (50) assurent le positionnement des fentes (41) et (42) des électrodes (3 et 4) par rapport à l'axe xy d'éjection du jet.Ink jet printing head which essentially comprises a first modulation element (1) in which are integrated in a base (19) the modulation body (31) and a cylindrical orientable plate (22) carrying the means ejection, capable of optimizing the perpendicularity of the jet. It also includes a second electrode-carrying element (2) consisting of a support (40). The first and second elements are made integral respectively with the housing (8) and with a movable part (11) of the cover (9). An axis (34) allows the articulation of this part (11) of the cover (9) relative to the base (19). Means (50) ensure the positioning of the slots (41) and (42) of the electrodes (3 and 4) relative to the axis xy of jet ejection.

Description

TETE D'IMPRESSION A 3ET D'ENCRE 3 AND INK PRINTHEAD
ET IMPRIMANTE QUI EN EST EQUIPEE.AND PRINTER EQUIPPED WITH IT.
L'invention concerne une tête d'impression à jet d'encre.The invention relates to an ink jet 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 électrostatiquement 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'impression.The inkjet printing technique consists in carrying out a continuous jet of calibrated drops, supplied by a modulation system, then in electrostatically charging these drops by means of charging electrodes,,. finally to deflect 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 a printing 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- - n statique et leur déflexion sont obtenues au moyen d'un dispositif appelé tête d'impression dans la suite de la description.In a printer inkjet the functions described above to find out the fragmentation of the jet into drops calibrated, their electrostatic charge - n static and deflection are obtained by means of a device called a print head in the following from 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 deflection 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 fonctionne¬ ment et permettre en revanche des réglages simples et fiables prélablement à la mise en route. Enfin, il faut que cette tête présente une grande facilité d'accès pour la maintenance. La présente invention a précisément pour but de réaliser une tête d'impression dont l'architecture lui permet de répondre à tous ces impératifs. Elle concerne plus précisément une tête d'impression à jet d'encre comportant notamment des moyens de modulation capables de briser le jet ; des moyens d'éjection des gouttes calibrées ; des moyens pour charger électrostatiquement ces gouttes et des moyens de deflection, cette tête étant caractérisée en ce que les moyens de modulation et d'éjec¬ tion sont intégrés dans un premier élément de modulation et les moyens de charge et de deflection sont intégrés dans un second élément dit porte électrodes, le premier et le second élément étant respectivement rendu solidaire d'un boitier et du couvercle de ce boîtier.The role of this head is fundamental for the proper functioning of an inkjet printer. It is necessary, in particular, that the drops trajectory ejected to "the ejection nozzle level is perfectly defined _ relative to the charging electrodes, the deflection plate and the support which receives the impression. The printhead responsive these criteria must, in addition, be space-saving, require no adjustment during operation and, on the other hand, allow simple and reliable adjustments prior to start-up. Finally, this head must be very easy The object of the present invention is precisely to produce a printhead whose architecture enables it to meet all these requirements, and more specifically relates to an inkjet printhead comprising in particular modulation means capable of breaking the jet; means for ejecting the calibrated drops; means for electrostatically charging these drops and deflection means, this head being characterized in that the modulation and ejection means are integrated in a first modulation element and the charging and deflection means are integrated in a second element called the electrode holder, the first and the second element being respectively secured to a case and the cover of this case.
L'invention sera mieux comprise à l'aide des explications qui vont suivre et des figures jointes parmi lesquelles :The invention will be better understood with the aid of the explanations which follow and of the appended figures among which:
- La figure 1 représente schématiquement l'essentiel des éléments constitutifs d'une tête d'impression conforme à l'invention.- Figure 1 schematically shows the main elements of a print head according to the invention.
- Les figures 2, 3 et sont des représentations schématiques plus 35 détaillées de certains éléments de la figure 1. Pour plus de clarté, les mêmes éléments portent les mêmes références dans toutes les figures. Comme le montre la figure 1, une tête d'impression conforme à l'inven¬ tion est essentiellement constituée d'un élément de modulation 1 ; d'un élément porte électrodes 2 supportant les électrodes de charge 3 et 4 ainsi que les plaques de deflection 5 et 6. Un système d 'électro-vannes 5 destiné à réguler l'alimentation en liquide ainsi qu'un porte-gouttière 7 supportant une gouttière 66 destinée à recueillir les gouttes non utilisées pour l'impresssion sont également intégrés à la tête d'impression.- Figures 2, 3 and are more detailed schematic representations of certain elements of Figure 1. For clarity, the same elements have the same references in all the figures. As shown in Figure 1, a print head according to the invention consists essentially of a modulation element 1; an electrode holder element 2 supporting the charge electrodes 3 and 4 as well as the deflection plates 5 and 6. A system of solenoid valves 5 intended to regulate the supply of liquid as well as a gutter holder 7 supporting a gutter 66 intended to collect the drops not used for printing are also integrated into the print head.
Ces éléments 1, 2, 5, 7 sont introduits dans un boîtier S dont le couvercle 9 est réalisé en deux parties : l'une supérieure 10 est dite fixe et l'autre ' inférieure 11 est dite mobile. Selon une caractéristique importante de l'in¬ vention, le boîtier 8 et son couvercle 9 assurent deux fonctions : celle de capotage et celle de maintien en place des éléments essentiels énumérés ci-dessus. Ce boîtier S coopère en effet avec l'architecture nouvelle de ces éléments pour assurer l'obtention, d'une part, de la localisation optimale de la brisure du jet, d'autre part, du centrage parfait du jet. Une telle disposition constructive de la tête d'impression, conforme à l'invention est particulièrement avantageuse pour la mise en oeuvre du procédé d'impression par jet d'encre comme cela est expliqué plus en détail ci-dessous au moyen de la figure 1 complétée par les figures 2, 3 et 4* qui» sont respectivement deux vues en coupe et une vue en plan de la partie de la tête qui conditionne plus particulièrement la qualité de l'impression. Le boîtier 8 qui constitue un premier support pour les éléments essentiels énumérés ci-dessus est appelé boîtier support 8 dans la suite de la description. Il comporte un fond 13, une embase inférieure 14, une embase supérieure 15 et deux parois latérales 16 et 17. Le systèrre d'électo vannes 5 est introduit dans le boîtier support 8 auquel il est fixé par tous moyens connus en soi. Les dispositifs de raccordements électriques, les canalisations d'amenée des fluides, les relais de sécurité et de manière générale tout l'environnement complémentaire qui n'est pas directement en rapport avec l'invention n'est pas représenté. Il s 'agit de moyens techniques classiques ; seul leur passage 18 dans l'embase supérieure 15 est représenté. L'embase inférieure 14 comporte un orifice 190 que traversent les gouttes calibrées, chargées et déviées en direction du substrat à imprimer (non représenté). Sur cette embase inférieure 14 on fixe le porte-gouttière 7 et la gouttière de récupération 66. L'élément de modulation 1 est essentiellement constitué d'une embase 19 comportant un alésage 20 de diamètre D , dans lequel est introduit le corps 21 de modulation proprement dit. Il peut s'agir par exemple d'un dispositif vibratoire à éléments pie z o-électriques tels que décrits dans le brevet français EN 7923934 déposé le 26.09.79, publié sous le N° 2.465.528 et dont le titulaire est la demanderesse. Le corps de modulation 21 porte à sa base une plaque cylindrique 22 fixée par au moins trois points de fixation 25 faisant entre eux un angle .s. , soit c = 120°, s'ils sont au nombre de trois comme c'est le cas dans l'exemple décrit (figure 3). Cette plaque 22 porte une buse 23 constituée par exemple d'un rubis percé d'un orifice 24 d'éjection du jet de gouttes dont le trajet est symbolisé par les axes XY et X'Y' ; l'embase 19 de l'élément de modulation 1 est rendu solidaire du fond 13 du boîtier-support 8, comme le montre la figure 2 par tous moyens connus, par exemple une vis 26. Selon une des caractéristiques de l'invention, les faces 28 de l'embaseThese elements 1, 2, 5, 7 are introduced into a housing S whose cover 9 is made in two parts: one upper 10 is said to be fixed and the other 'lower 11 is said to be mobile. According to an important characteristic of the invention, the housing 8 and its cover 9 perform two functions: that of rollover and that of holding in place the essential elements listed above. This housing S cooperates indeed with the new architecture of these elements to ensure obtaining, on the one hand, the optimal location of the jet break, on the other hand, the perfect centering of the jet. Such a constructive arrangement of the printhead, in accordance with the invention is particularly advantageous for the implementation of the ink jet printing process as is explained in more detail below by means of FIG. 1 supplemented by Figures 2, 3 and 4 * which »are respectively two sectional views and a plan view of the part of the head which more particularly conditions the quality of the print. The housing 8 which constitutes a first support for the essential elements listed above is called support housing 8 in the following description. It comprises a bottom 13, a lower base 14, an upper base 15 and two side walls 16 and 17. The system of solenoid valves 5 is introduced into the support housing 8 to which it is fixed by any means known per se. The electrical connection devices, the fluid supply pipes, the safety relays and in general all the complementary environment which is not directly related to the invention is not shown. These are conventional technical means; only their passage 18 in the upper base 15 is shown. The lower base 14 has an orifice 190 through which the calibrated, charged and deflected drops pass through in the direction of the substrate to be printed (not shown). On this lower base 14 the gutter holder 7 and the recovery gutter 66 are fixed. The modulation element 1 essentially consists of a base 19 comprising a bore 20 of diameter D, into which the modulation body 21 is introduced. well said. It may for example be a vibratory device with pie z o-electric elements as described in French patent EN 7923934 filed on 09.29.79, published under No. 2,465,528 and the holder of which is the plaintiff. The modulation body 21 carries at its base a cylindrical plate 22 fixed by at least three fixing points 25 forming an angle .s between them. , or c = 120 °, if they are three in number as is the case in the example described (Figure 3). This plate 22 carries a nozzle 23 consisting for example of a ruby pierced with an orifice 24 for ejecting the jet of drops, the path of which is symbolized by the axes XY and X'Y '; the base 19 of the modulation element 1 is made integral with the bottom 13 of the support housing 8, as shown in FIG. 2 by any known means, for example a screw 26. According to one of the characteristics of the invention, the faces 28 of the base
19 du corps de modulation 21 subissent un usinage tel, qu'elles sont parfai¬ tement tolérancées en dimensions et en parallélisme. De plus, la translation en hauteur du corps de modulation 21 et sa rotation dans l'alésage 20 sont réglables par coulissement et/ou rotation du corps 21 dans l'embase 19 et son blocage au positionnement désiré par une vis de biocage 30. L'embase 19, support du corps de modulation 21 comporte en outre un décrochement 31, muni d'un alésage 32 capable de recevoir un axe 34. Lorsque l'élément de modulation I est fixé dans le boîtier-support 8 ainsi que tous les autres accessoires intervenant dans cette partie supérieure du boîtier 8, on met en place la partie supérieure fixe 10 du couvercle 9, dont le profil- présente également un décrochement 35 qui libère la place pour les extrémités de l'axe 34 destiné à être à leur tour enfilées dans un alésage 36 pratiqué dans la partie 11 du couvercle 9 comme cela sera expliqué plus loin. Un second élément extrêmement important de l'invention et don t la coopération avec l'élément de modulation 1 est essentielle au bon fonction¬ nement de la tête d'impression est constitué par l'élément porte-électrodes 2. Celui-ci comporte essentiellement un corps support 40 dans lequel sont encastrées et fixées l'électrode de charge 3 et l'électrode de contrôle de charge 4, et qui reçoit par la fixation le jeu de plaques de déflexion 5 et 6. Les deux électrodes 3 et 4 sont munies chacune d'une fente calibrée 41 et 42 à travers lesquelles passe le jet de gouttes fourni par l'élément de modulation 1 et. la buse 24, avant de traverser l'espace qui sépare les deux plaques de déflexion 5 et 6. Les fentes 41 et 42 réalisées dans ces électrodes et les faces d'appui des plaques de déflexion sont par construc¬ tion rigoureusement parallèles. Selon une caractéristique importante de l'invention, l'élément porte-électrodes 2 est rendu solidaire de la partie inférieure 11 du couvercle 9 destiné à fermer le boitier-support 8, préalable¬ ment équipé de l'élément de modulation 1. Cette solidarisation est réalisée19 of the modulating body 21 undergo such machining that they are perfectly tolerated in dimensions and in parallelism. In addition, the translation in height of the modulation body 21 and its rotation in the bore 20 are adjustable by sliding and / or rotation of the body 21 in the base 19 and its blocking in the desired positioning by a biocage screw 30. L base 19, support of the modulation body 21 further comprises a recess 31, provided with a bore 32 capable of receiving an axis 34. When the modulation element I is fixed in the support housing 8 as well as all the others accessories intervening in this upper part of the housing 8, the fixed upper part 10 of the cover 9 is put in place, the profile of which also has a recess 35 which frees space for the ends of the axis 34 intended to be in turn threaded into a bore 36 formed in the part 11 of the cover 9 as will be explained below. A second extremely important element of the invention and don t cooperation with the modulation element 1 is essential for the proper functioning of the print head is constituted by the electrode holder element 2. This essentially comprises a support body 40 in which are embedded and fixed the charge electrode 3 and the charge control electrode 4, and which receives by fixing the set of deflection plates 5 and 6. The two electrodes 3 and 4 are provided each of a calibrated slot 41 and 42 through which the jet of drops supplied by the modulation element 1 and passes. the nozzle 24, before crossing the space which separates the two deflection plates 5 and 6. The slots 41 and 42 produced in these electrodes and the bearing faces of the deflection plates are by construction strictly parallel. According to an important characteristic of the invention, the electrode holder element 2 is made integral with the lower part 11 of the cover 9 intended to close the support box 8, previously fitted with the modulation element 1. This connection is carried out
SHEAt par un moyen 50, autorisant un réglage du positionnement transversal de l'élément porte-électrodes 2, tandis que son positionnement vertical est fixé par un jeu de plots 51 s Opposant à son glissement dans le sens longitudinal. Lorsque l'élément porte-électrodes 2 est fixé à la partieSHEAt by means 50, allowing adjustment of the transverse positioning of the electrode holder element 2, while its vertical positioning is fixed by a set of studs 51 s opposing its sliding in the longitudinal direction. When the electrode holder 2 is attached to the part
5 inférieure i l du couvercle 9, celle-ci est mise en place sur le boitier- support 8 déjà équipé de la partie supérieure 10 de son couvercle 9. L'axe 34 traverse la partie 11 et l'embase 19 de modulation à travers les alésages 32 et 36. La pièce 11 est guidée en rotation sur les faces 28 de l'embase 19. Lorsque tous les réglages que l'on va décrire ci-dessous ont été réalisés5 lower it of the cover 9, this is put in place on the support box 8 already equipped with the upper part 10 of its cover 9. The axis 34 passes through the part 11 and the base 19 of modulation through the bores 32 and 36. The part 11 is guided in rotation on the faces 28 of the base 19. When all the adjustments which will be described below have been made
10 et que' la tête est prête pour son fonctionnement, on immobilise la partie inférieure 11 du couvercle 9 au moyen par exemple d'un écrou moileté10 and that ' the head is ready for its operation, the lower part 11 of the cover 9 is immobilized by means, for example, of a soft nut
60 qui la rend solidaire de l'embase inférieure 14 du boitier-support 8.60 which makes it integral with the lower base 14 of the support box 8.
La structure des pièces élémentaires décrites précédemment et leur combinaison permet tous les réglages qui sont nécessaires au bonThe structure of the elementary parts described above and their combination allows all the adjustments that are necessary for the correct
15 fonctionnement d'une tête d'impression conforme à l'invention.15 operation of a print head according to the invention.
Premièrement, lorsqu'on chasse un rubis dans une pièce support comme c'est le cas pour la buse 23 insérée dans la plaque cylindrique 22, si l'on prend comme référence la face de cette pièce support, il est très difficile d'obtenir un jet parfaitement perpendiculaire à cette face. 0 La possibilité d'orienter la plaque 22 selon au moins trois directions étant donné la présence de au moins trois points de fixation faisant entre eux un angle o . par exemple , 120° permet de choisir entre au moins trois orien¬ tations angulaires possibles, celle qui permet d'obtenir un jet contenu dans, ou le plus proche possible d'un pian passant par X'Y'. De plus comme 5 on peut orienter le corps de modulation 21 en rotation à l'intérieur de l'embase de modulation 19, on est sûr de pouvoir, par la combinaison des deux actions conjuguées au niveau de la plaque 22 porte buse et du corps de modulation 21 de satisfaire une conditions fondamentale, à savoir : mettre le jet dans un plan parallèle aux faces des électrodes de chargeFirst, when chasing a ruby in a support piece as is the case for the nozzle 23 inserted in the cylindrical plate 22, if we take as a reference the face of this support piece, it is very difficult to obtain a jet perfectly perpendicular to this face. 0 The possibility of orienting the plate 22 in at least three directions given the presence of at least three fixing points forming an angle o between them. for example, 120 ° makes it possible to choose between at least three possible angular orien¬ tations, that which makes it possible to obtain a jet contained in, or as close as possible to a plane passing through X'Y '. In addition, since 5 it is possible to orient the modulation body 21 in rotation inside the modulation base 19, it is certain to be able, by the combination of the two combined actions at the level of the nozzle holder plate 22 and of the body. modulation 21 to satisfy a fundamental condition, namely: putting the jet in a plane parallel to the faces of the charge electrodes
30 3 et 4 définies par les fentes 41 et 42 et aux plaques de déflexion 5 et . 6, le parallélisme de ces faces et de ces plaques étant quant à lui obtenu par construction.30 3 and 4 defined by the slots 41 and 42 and the deflection plates 5 and. 6, the parallelism of these faces and of these plates being obtained by construction.
Deuxièmement, ce parallélisme étant satisfait on assure le centrage du jet grâce à un moyen de centrage 50.Secondly, this parallelism being satisfied, the jet is centered by means of a centering means 50.
35 On obtient donc ainsi, par des réglages simples et fixes dans le temps un centrage et une orientation optimale du jet par rapport aux éléments fonctionnels auxquels il est lié.35 One thus obtains, by simple and fixed adjustments in time, a centering and an optimal orientation of the jet with respect to the functional elements to which it is linked.
Troisièmement, l'électrode de charge 3 doit être située à une distance déterminée de l'endroit précis où le jet se brise en gouttelettes, en l'occurrenceThird, the charging electrode 3 must be located at a determined distance from the precise place where the jet breaks up into droplets, in this case
(3,0 la brisure doit se produire dans le milieu de la fente 41 de l'électrode l'alésage 20 permet de satisfaire ce critère.(3.0 the break must occur in the middle of the slot 41 of the electrode bore 20 makes it possible to satisfy this criterion.
La gouttière 66, est également fixée à l'embase inférieure du boitier 8. Son rôle est de recueillir les gouttes non utilisées pour l'impression.The gutter 66 is also fixed to the lower base of the housing 8. Its role is to collect the drops not used for printing.
Une tête d'impression, conforme à l'invention peut équiper tous types d'inprimantes du type dit à jet d'encre continu. Outre la facilité des réglages déjà énoncée précédemment il faut également noter une maintenance particu¬ lièrement facilitée du fait de l'ouverture possible du couvercle 9 dont la partie inférieure 11 peut subir une rotation autour de l'axe 34. Le substrat à imprimer est placé face au passage 190 ménagé dans l'embase inférieure 14 du boitier 8 et perpendiculairement à l'axe xy du jet défini précédemment. A print head according to the invention can be fitted to all types of printers of the so-called continuous ink jet type. In addition to the ease of the adjustments already stated above, it should also be noted that maintenance is particularly facilitated because of the possible opening of the cover 9, the lower part 11 of which can undergo rotation around the axis 34. The substrate to be printed is placed facing the passage 190 formed in the lower base 14 of the housing 8 and perpendicular to the xy axis of the jet defined above.

Claims

REVENDICATIONCLAIM
1) Tête" d'impression à jet d'encre comportant notamment un corps de modulation (21 ) capable de briser le jet ; des moyens (24) d'éjection de gouttes calibrées, des moyens de charge électrostatique de ces gouttes (3, 4,) et des moyens de déflexion (5,6) ainsi qu'une gouttière de récupération (66) caraoté- risée en ce que les moyens de modulation et d'éjection sont intégrés dans un pre¬ mier élément dit dé modulation (1) et les moyens de charge et de déflexion sontinté- grés dans un second élément dit porte-électrodes ( 2,) le premier et le second élément (1 ) et (2) étant rendus respectivement solidaires d'un boitier (8) et du couvercle (9 )de ce boitier(8 2) Tête d'impression selon la revendication 1, caractérisée en ce que cet élément de modulation (1) comporte une embase ( 19) comportant un alésage1) Head "jet printing ink comprising such a modulation body (21) capable of breaking the jet, means (24) calibrated drop ejection, electrostatic charging means of these drops (3, 4,) and deflection means (5,6) as well as a recovery gutter (66), caraotized in that the modulation and ejection means are integrated in a first element called modulation element (1 ) and the charging and deflection means are integrated in a second element called electrode holder (2,) the first and second element (1) and (2) being respectively made integral with a housing (8) and the cover (9) of this box (8 2) Printhead according to claim 1, characterized in that this modulating element (1) comprises a base (19) comprising a bore
(20) dans lequel est introduit le corps de modulation (21 ) de manière orientable à la fois en rotation et en translation.(20) into which the modulation body (21) is introduced so as to be orientable both in rotation and in translation.
3) Tête d'impression selon l'une des revendications précédentes caractérisée en ce que cette embase (19) comporte en outre une plaque ( 22) positionnée à la base du corps de modulation (21) et destinée à porter les moyens d'éjec¬ tions (24), cette plaque étant fixée au corps de modulation (21) par au moins trois points de fixation (25) de telle sorte que l'action con jugée de la rotation du corps de modulation (21) avec la rotation de la plaque (22 ) porte buse ( 23), (24), permette l'optimisation de la perpendicularité selon un axe xy du jet des gouttes calibrées, tandis que le réglage en hauteur du corps de modulation3) Printhead according to one of the preceding claims characterized in that this base (19) further comprises a plate (22) positioned at the base of the modulation body (21) and intended to carry the means of ejec ¬ tions (24), this plate being fixed to the modulation body (21) by at least three fixing points (25) so that the con action judged by the rotation of the modulation body (21) with the rotation of the nozzle holder plate (22) (23), (24), allows the optimization of the perpendicularity along an xy axis of the jet of the calibrated drops, while the height adjustment of the modulation body
(21) permet d'optimiser la localisation du point où s'effectue la brisure du jet.(21) optimizes the location of the point where the jet breaks.
4) Tête d'éjection selon l'une des revendications précédentes, caractérisée en ce que les faces (28) de l'embase ( 19) sont usinées de telle sorte qu'elles répondent à un niveau de tolérances de parallélisme donné.4) Ejection head according to one of the preceding claims, characterized in that the faces (28) of the base (19) are machined so that they meet a given level of parallelism tolerances.
5) Tête d'éjection selon l'une des revendications 3 et 4, caractérisée en ce que cette embase( 19) comporte en outre un décrochement (31) délimitant une face A, muni d'un alésage (32)capable de recevoir un axe (34.) 6) Tête d'éjection selon l'une des revendications précédentes caractérisée en ce que l'élément de modulation (1) est fixé dans le fond (13 ) du boitier ( 8,) par un moyen de fixation (26 ),une partie supérieure fixe (10 )du couvercle( 9) étant fixée sur le côté opposé au fond (13) cette partie ( 10) présentant un décrochement (35) dont le profil recouvre la face A de l'embase (19). 7) Tête d'éjection selon l'une des revendications précédentes, caractérisée en ce que l'élément porte-électrodes ( 2) est constitué d'un corps support (40) dans lequel sont encastrées d'une part l'électrode de charge (3) compor¬ tant une fente (41), l'électrode de contrôle de charge (4) comportant une fente (42) et les plaques de déflexion (5 et 6).5) Ejection head according to one of claims 3 and 4, characterized in that this base (19) further comprises a recess (31) delimiting a face A, provided with a bore (32) capable of receiving a axis (34.) 6) Ejection head according to one of the preceding claims, characterized in that the modulating element (1) is fixed in the bottom (13) of the housing (8,) by a fixing means ( 26), a fixed upper part (10) of the cover (9) being fixed on the side opposite the bottom (13) this part (10) having a recess (35) whose profile covers the face A of the base (19 ). 7) Ejection head according to one of the preceding claims, characterized in that the electrode holder element (2) consists of a support body (40) in which are embedded on the one hand the charge electrode (3) comprising a slot (41), the charge control electrode (4) comprising a slot (42) and the deflection plates ( 5 and 6).
8) Tête d'éjection selon la revendication 7, caractérisé en ce que l'élément porte-électrodes (2) est constitué d'un corps support (40) dans lequel sont encastrés, d'une part l'électrode de charge (3), et l'électrode de contrôle de charge (4) d'autre part, et qui reçoit par fixation des plaques de déflexion (5) et (6) ; les fentes (41) et (42) réalisées dans ces électrodes et les faces d'appui des plaques de déflexion étant par construction rigoureusement * parallèles.8) Ejection head according to claim 7, characterized in that the electrode holder element (2) consists of a support body (40) in which are embedded, on the one hand the charging electrode (3 ), and the charge control electrode (4) on the other hand, and which receives by fixing deflection plates (5) and (6); the slots (41) and (42) produced in these electrodes and the bearing faces of the deflection plates being by construction strictly * parallel.
9) Tête d'éjection selon la revendication 7 caractérisée en ce que cet élément porte-électrodes (2) est rendu solidaire d'une partie inférieure mobile (10) du couvercle (9) par un moyen (50) capable d'assurer un réglage transversal des fentes (41 et 42) pour les centrer par rapport à l'axe xy du jet de gouttes calibrées fourni par l'élément de modulation (1).9) Ejection head according to claim 7 characterized in that this electrode-carrying element (2) is made integral with a movable lower part (10) of the cover (9) by means (50) capable of ensuring a transverse adjustment of the slots (41 and 42) to center them relative to the xy axis of the jet of calibrated drops provided by the modulating element (1).
10) Tête d'éjection selon la revendication 9, caractérisé en ce que des plots (51) assurent le positionnement fixe dans le sens longitudinal de l'élément porte-électrodes (2) lorsqu'il est rendu solidaire de la partie inférieure mobile (11) du couvercle (9). 11) Tête d'éjection selon l'une des revendications précédentes, caractérisée en ce que la partie inférieure mobile (11) du couvercle (9) comporte un alésage (36) destiné à recevoir l'axe (34) préalablement introduit dans l'alésage (31) de l'embase de modulation (19).10) Ejection head according to claim 9, characterized in that studs (51) ensure the fixed positioning in the longitudinal direction of the electrode holder element (2) when it is made integral with the movable lower part ( 11) of the cover (9). 11) Ejection head according to one of the preceding claims, characterized in that the movable lower part (11) of the cover (9) has a bore (36) intended to receive the axis (34) previously introduced into the bore (31) of the modulation base (19).
12) Tête d'éjection selon l'une des revendications précédentes, caractérisée en ce qu'un support porte gouttière (7) permet la fixation d'une* gouttière de récupération (66) des gouttes non utilisées pour l'impression sur l'embase inférieure (14) du boitier (8) dans lequel est ménagé un passage (190) que traversent les gouttes calibrées en direction du substrat à imprimer.12) Ejection head according to one of the preceding claims, characterized in that a gutter support support (7) allows the fixing of a * recovery gutter (66) of the drops not used for printing on the lower base (14) of the housing (8) in which is formed a passage (190) through which the calibrated drops pass in the direction of the substrate to be printed.
13) Tête d'éjection selon l'une des revendications précédentes, caractérisée en ce qu'un écrou molleté (60) permet de rendre solidaire la partie infé¬ rieure (H), du couvercle (9) à l'embase inférieure (14) du boitier (8).13) Ejection head according to one of the preceding claims, characterized in that a knurled nut (60) allows to make integral the lower part (H) , the cover (9) to the lower base (14 ) of the housing (8).
14) Imprimante à jet d'encre, caractérisée en ce qu'elle est équipée d'une tête d'impression selon l'une des revendications précédentes dont les réglages des différents éléments ont été réalisés avant la mise en route de l'imprimante ; ces réglages demeurant fixes pendant la durée de l'impression sur un substrat qui est situé face au passage (190) ménagé dans l'embase inférieure (14) du boitier (8) et perpendiculairement à l'axe xy du jet. 14) Inkjet printer, characterized in that it is equipped with a print head according to one of the preceding claims, the settings of the various elements of which have been made before the printer is started up; these settings remaining fixed for the duration of printing on a substrate which is located opposite the passage (190) formed in the lower base (14) of the housing (8) and perpendicular to the xy axis of the jet.
EP84900990A 1983-03-07 1984-02-28 Ink jet printing head and printer provided therewith Expired EP0135558B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8303975A FR2542257B1 (en) 1983-03-07 1983-03-07 INK JET PRINTING HEAD AND PRINTER HAVING THE SAME
FR8303975 1983-03-07

Publications (2)

Publication Number Publication Date
EP0135558A1 true EP0135558A1 (en) 1985-04-03
EP0135558B1 EP0135558B1 (en) 1988-08-24

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US (1) US4617574A (en)
EP (1) EP0135558B1 (en)
JP (1) JPS60500660A (en)
AU (1) AU576751B2 (en)
CA (1) CA1225876A (en)
DE (1) DE3473582D1 (en)
FR (1) FR2542257B1 (en)
IT (2) IT8453065V0 (en)
WO (1) WO1984003474A1 (en)

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Also Published As

Publication number Publication date
FR2542257B1 (en) 1985-08-02
IT8453065V0 (en) 1984-03-07
IT1182256B (en) 1987-10-05
IT8467211A0 (en) 1984-03-07
FR2542257A1 (en) 1984-09-14
AU2575584A (en) 1984-09-28
US4617574A (en) 1986-10-14
CA1225876A (en) 1987-08-25
JPS60500660A (en) 1985-05-09
JPH0452779B2 (en) 1992-08-24
WO1984003474A1 (en) 1984-09-13
AU576751B2 (en) 1988-09-08
DE3473582D1 (en) 1988-09-29
EP0135558B1 (en) 1988-08-24

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