EP0057956B1 - Tête à écrire pour une imprimante à jet d'encre - Google Patents

Tête à écrire pour une imprimante à jet d'encre Download PDF

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Publication number
EP0057956B1
EP0057956B1 EP82200100A EP82200100A EP0057956B1 EP 0057956 B1 EP0057956 B1 EP 0057956B1 EP 82200100 A EP82200100 A EP 82200100A EP 82200100 A EP82200100 A EP 82200100A EP 0057956 B1 EP0057956 B1 EP 0057956B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
writing head
duct
block
ducts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82200100A
Other languages
German (de)
English (en)
Other versions
EP0057956A3 (en
EP0057956A2 (fr
Inventor
Udo Bergmann
Heinrich Dr. Kurz
Wolfgang Radtke
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0057956A2 publication Critical patent/EP0057956A2/fr
Publication of EP0057956A3 publication Critical patent/EP0057956A3/de
Application granted granted Critical
Publication of EP0057956B1 publication Critical patent/EP0057956B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/1429—Structure of print heads with piezoelectric elements of tubular type

Definitions

  • the invention relates to a write head for inkjet printers with a plurality of nozzle channels, each of which is assigned a drive element for ejecting ink droplets as required and to which the ink is supplied via a common distributor channel and via attenuators assigned via each nozzle channel, the nozzle channels, the distributor channel and the attenuators are arranged in a block forming the print head, in particular made of plastic, and run in such a way that the nozzle channels opening into the distribution channel in the area between the drive elements and outlet nozzles are deflected such that they run parallel to one another in the remaining areas, the distance in the area the outlet nozzles is determined by the required distance of the ink droplets to be applied in a mosaic on the recording medium and in the rear region by the dimensions of the drive elements.
  • Such a write head is known from DE-OS 2 918 737.
  • the nozzle channels, the distribution channel and the attenuators are designed as integrated trenches in a plastic block and are covered by a cover plate and thus closed.
  • the individual nozzle channels can only be checked after the complete assembly of the print head and it is difficult to adjust the individual nozzle elements individually, so that either a loss in quality or increased rejects have to be accepted.
  • a writing head is known from DE-OS 2 659 398, which contains several channels and drive elements, in order to represent characters in the form of an ink drop matrix, in particular as an ink-jet writing mechanism.
  • These print heads essentially consist of two plastic blocks.
  • the tubular nozzle channels with their drive elements are cast into one plastic block.
  • the channels are cast in a fan-shaped and straight line and open at their front ends in a separate nozzle plate, in which the nozzles are then aligned parallel to one another.
  • each channel is shaped so that it has a parallel cross section in the area of the cylindrical drive elements, which is relatively large.
  • the geometric arrangement of the nozzles in the nozzle plate is designed in such a way that the spacing of the nozzles from one another corresponds to the conditions resulting from the grid-like structure of the characters to be printed. For example, with a character height of 3.2 mm, the nozzle center distance for six nozzles is 0.53 mm. In order to meet this condition, the nozzle channels in the area between the drive elements and the nozzles must be conical. This means more work and materials.
  • the second plastic block contains a trough-shaped recess into which the liquid is introduced. Both plastic blocks are firmly connected to each other at their edges.
  • a further plate is provided between the plastic blocks, in which damping channels (throttles) are arranged, the tube cross section of which is smaller than the cross section of the nozzle channels and which are parallel to one another.
  • the known system is difficult to fill with liquid without trapping gas bubbles in the transition zones. Any misalignment between the pressure channel and the nozzle element promotes the gas bubble inclusion, not only when filling the liquid for the first time, but also during operation, because e.g. B. can shake the liquid back into the interior of the system by shaking and then trapping air bubbles at the critical points. Any offset between the pressure channel and the nozzle element also hinders the pressure line in any case and causes pressure losses.
  • a writing element for inkjet printers is known from US Pat. No. 3,832,579, the tubular nozzle channel of which is made of glass and runs in a straight line from the area of the drive element to the outlet nozzle with the same, relatively large cross-section.
  • Nozzle channel and nozzle consist of one piece.
  • a hose is attached to the end of the nozzle channel facing away from the nozzle, via which the inks are closed drove out of an ink reservoir.
  • This hose has a smaller cross section than the nozzle channel, so that it acts as an attenuator.
  • the electromechanical, preferably piezoelectric drive element is arranged in tubular form around the nozzle channel and, when electrically controlled, exerts a pressure on the liquid in the nozzle channel. This pressure is not only directed towards the outlet nozzle, but also towards the rear in the opposite direction. However, since the liquid should only be ejected towards the front of the nozzle, the damping element is provided on the rear nozzle channel.
  • the invention has for its object to design a write head of the type mentioned with a simple manufacturing possibility so that the function of the individual nozzle channels can be checked and adjusted individually during manufacture and before completion to a writing head, without sacrificing a compact design to have to.
  • all the nozzle channels, including the damping members are each designed as integrated tubular units and are each provided with a permanently assigned drive element, that the individual nozzle channels are held in a first block in a predetermined assignment to one another in such a way that the feed openings of the Nozzle channels are open to a level of the first block, and that the distribution channel is arranged in a second block such that it forms an open distribution channel to a level corresponding to the level of the first block, and that the level of the first block and the level of the second blocks are joined together.
  • the drive elements themselves are expediently kept freely accessible, so that they can be adjusted subsequently and all writing nozzles have the same drop emission.
  • the distribution channel is tubular and has a larger cross section than the cross section of a nozzle channel.
  • the routing of the distribution channel in the separate plastic block is insignificant. It can be guided in a U-shape or in a straight line. It is only essential that the actual feed area for the nozzle channels runs perpendicular to these.
  • the material of the nozzle channels can also be any and depends essentially on the compatibility with the ink liquid and the plastic used for the block. Nozzle channels made of glass are particularly advantageous.
  • a writing head designed in this way is also particularly simple to manufacture, the method according to the invention of which is characterized in that each nozzle channel is first brought into the predetermined shape and provided with a drive element, then checked for proper function and droplet emission, then in a holder is aligned and poured into a plastic block so that after this process the plastic block is cut flat at its rear end perpendicular to the ends of the nozzle channels and connected to the distributor channel, which is also cast in a plastic block.
  • the drop emission of the individual nozzle channels is measured and coordinated with one another by trimming the drive elements. This trimming can take place in that one of the electrodes of the drive elements in question, in whose nozzle channel there is a drop emission that deviates from a predetermined value, is reduced more or less until the predetermined value is reached.
  • the write head according to the invention has the advantage that the individual nozzle channels with their drive elements can be checked individually for their functionality before being poured into the plastic block during its manufacture. This practically eliminates rejects on finished print heads. It is also possible to trim the individual drive elements after the production of the write head and thus to set all of its nozzle channels to the same properties with the same drive pulses for all channels.
  • the control electronics for the write head can thus be designed in a simple manner.
  • the nozzle channels have the same cross-section over their entire length, except in the area of the damping members and the nozzles, which is kept relatively small, e.g. B. 0.4 mm.
  • the drive elements are controlled in such a way that the liquid meniscus present in the nozzle is first drawn into the front part of the nozzle channel by the applied voltage pulse and the voltage is switched off as soon as the liquid meniscus has reached its maximum in the ejection direction. The fact that the liquid is drawn in first and then ejected results in a higher initial velocity of the ejected droplet.
  • only a low control voltage is required to emit the liquid. This is a negative control in contrast to the known arrangements in which there is a positive control, i.e. the liquid meniscus is immediately moved in the direction of the discharge.
  • the write head for an inkjet printer in which the individual ink droplets are ejected from the nozzles and then hit a recording medium in free flight, i.e. are not deflected in an electromagnetic field, consists of a tubular nozzle channel 1 with a drive element 2 surrounding it.
  • the drive element is preferably glued to the nozzle channel.
  • Each nozzle channel 1 is deflected or bent between the drive element 2 and the outlet nozzle 3 such that it runs parallel to the adjacent nozzle channels of the write head outside this area, the center distance of the nozzles in the front area being due to the required distance of the mosaic-like ink droplets on the Record carriers, e.g. B. 0.53 mm, and in the rear area is determined by the dimensions of the drive elements 2.
  • a constriction is provided which serves as an integrated damping 4 for the liquid vibrations.
  • the cross section of the nozzle channel is the same over its entire length and is e.g. 0.4 mm.
  • This relatively small cross section allows the combination of several nozzle channels to form a write head made of e.g. B. six superposed nozzles or from a nozzle matrix, with a character size on the record carrier of 3.2 mm height, the center distance of the superimposed nozzles is 0.53 mm.
  • the constant cross-section enables better control of the liquid discharge through the drive elements.
  • the drive element 2 acts as an electromechanical transducer and is designed in particular as a piezoelectric transducer. It consists of an inner electrode 5 lying directly on the outer surface of the nozzle channel 1, an outer electrode 6 and a piezoelectric element 7 arranged in between. The inner electrode 5 is on one side around the end face of the piezoelectric element 7 up to the top thereof drawn and separated from the outer electrode 6 by an electrically non-conductive gap. This provides a simple connection of the connecting wires 8 and 9.
  • This element shown in FIG. 1 is a functional drop generator and, if necessary, can be checked for its functionality before being assembled with other such drop generators. As a result, the number of rejects on print heads can be kept low.
  • a module is now produced from several such nozzle channels 1, in which e.g. six nozzle channels 1, which are bent in a precisely defined manner, including their drive elements 2, outlet nozzles 3 and damping members 4, are immovably combined in a block 10. 2 shows that this can be done, for example, with a casting resin.
  • the drive elements 2 themselves are not cast in, in order to keep free access to them, not to hinder their movements by casting resin or other fixings, and also to isolate them mechanically from one another.
  • the drive elements can also be cast in the plastic block 10. Then, however, the change described later and the advantages mentioned must be dispensed with.
  • the combination into a module therefore expediently only takes place on the nozzle channels themselves.
  • the individual nozzle channels are poured in a mold.
  • the holder in the area of the outlet nozzles 3 can be carried out in a known manner by means of a holding comb 12 or a perforated plate which ensures the required nozzle spacing.
  • This bracket 12 is cast together with the individual nozzle channels 1.
  • the nozzle channels 1 are placed in a divisible holder of the casting mold, not shown, in such a way that the drive elements 2 are located in the recess 14 formed by the holder and the nozzle channels protrude on both sides of this recess 14.
  • the feedthroughs in the mold for the nozzle channels 10 must be tight so that no casting resin reaches the drive elements 2.
  • nozzle channels 1 now held in the areas of the outlet nozzles 3 and the drive elements 2 are placed in a mold, not shown, which determines the shape of the module, care being taken to ensure that no casting resin can penetrate into the interior of the nozzle channels 1.
  • This can be done in a known manner by flexible sealing materials, e.g. Silicone rubber, reach.
  • the casting mold can also be designed such that it already ends at the section line 13.
  • shrinkage tolerances cannot be ruled out, there is a risk that the edge will not be flat and the ends of the nozzle channels will protrude somewhat from this edge surface. As described later, this area must be sealed against the distribution channel.
  • the tubular distribution channel is produced in a separate operation (FIG. 3).
  • a U-shaped channel 16 is formed in a plastic block 15, for. B. by casting a correspondingly shaped wire, which is then etched out, or in another suitable form.
  • the mold On the side of the web, the mold, not shown, is also kept somewhat larger.
  • the plastic block 15 In the area of this web, the plastic block 15 is then brought to the desired shape along the cutting line 20.
  • This section line 20 is to be laid so that the web of the distribution channel is open to the outside.
  • the distribution channel is at least larger in cross section than the cross section of the individual nozzle channels 1 in the area of the web and runs perpendicular to these.
  • the print head allows liquid to be filled in easily without trapping gas bubbles. This is achieved in that there are no disruptive edges in the course of the liquid paths.
  • the ink supply can also take place in such a way that the distribution channel 17 is led straight up and down out of the block 15.
  • the drive elements 2 are freely accessible on the finished write head. If at the same time one possibility is provided on each drive element 2 to trim it, the entire write head, i.e. set all of its nozzle channels 1 to the same properties with the same control impulses for all channels. When using piezoelectric transducers, this can be done in a simple manner by partially burning away or etching away one of the electrodes 5 or 6. The efficiency of the individual drive elements can thus be set so that all nozzle channels 1 react in the same way to the same control pulse.
  • the module can be manufactured as a plate-like element. If several such modules are stacked and the outlet nozzles 3 of one module are shifted in a suitable manner, multiple print heads can be produced with many drop generators working simultaneously, which at the same time allow many matrix patterns determined by the arrangement of the outlet nozzles.

Landscapes

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

Claims (13)

1. Tête à écrire destinée à une imprimante à jet d'encre et munie de plusieurs canaux à tuyère à chacun desquels est adjoint un élément de commande pour donner lieu à l'éjection de gouttelettes d'encre suivant les besoins, lesdits canaux à tuyère recevant l'encre nécessaire par l'intermédiaire d'un canal de distribution commun (17) et d'éléments d'amortissement (4), chaque canal à tuyère (1) étant muni d'un tel élément d'amortissement (4), alors que lesdits canaux à tuyère (1), le canal de distribution (17) et les éléments d'amortissement (4) sont élaborés dans un bloc (15) en particulier en matière synthétique formant la tête à écrire, et s'étendent de manière telle que dans la zone entre les éléments de commande (2) et les tuyères d'éjection (3), les canaux à tuyère (1) qui débouchent dans le canal de distribution (17) sont déviés de façon à être parallèles dans les autres zones, tandis que dans la zone des tuyères d'éjection (3), la distance entre les canaux est définie par la distance entre les gouttelettes d'encre à amener en forme de mosaïque sur le porteur d'enregistrement et que dans la zone arrière, la distance entre les canaux est définie par les dimensions des éléments de commande (2), caractérisé en ce que chaque canal à tuyère (1), y compris son élément d'amortissement (4), constitue une unité tubulaire intégrée et est muni d'un élément de commande (2) rendu solidaire de ce canal, que les canaux à tuyère (1) sont maintenus ensemble dans une configuration prédéterminée dans un premier bloc (10) de façon que les ouvertures d'admission d'encre des canaux à tuyère (1) sont ouvertes vers une surface plane (13) du premier bloc, et que dans un second bloc (15) le canal de distribution d'encre (17) est élaboré de manière à former un canal (17) qui est ouvert vers une surface plane (20) qui correspond à ladite surface plane (13) du premier bloc (10), et que cette surface plane (13) du premier bloc (10) et la surface plane (20) du second bloc (15) sont jointes l'une à l'autre.
2. Tête à écrire selon la revendication 1, caractérisée en ce que les éléments de commande (2) des canaux à tuyère (1) sont librement accessibles dans un évidement (14) du premier bloc (10).
3. Tête à écrire selon les revendications 1 et 2, caractérisé en ce que les éléments de commande (2) sont tubulaires et collés sur les canaux à tuyère (1).
4. Tête à écrire selon les revendications 1 à 3, caractérisée en ce que les éléments de commande (2) sont élaborés parallèlement les uns aux autres.
5. Tête à écrire selon les revendications 1 à 4, caractérisée en ce que l'électrode interne (5) de l'élément de commande (2) s'étend jusqu'à la face extérieure de cet élément.
6. Tête à écrire selon les revendications 1 à 5, caractérisée en ce que la section transversale d'un canal à tuyère (1) est la même sur toute la longueur de canal, sauf dans la zone de l'élément d'amortissement (4) et de la tuyère d'éjection (3).
7. Tête à écrire selon les revendications 1 à 6, caractérisée en ce que le canal de distribution (17) est tubulaire alors que sa section transale est plus grande que celle d'un canal à tuyère (1).
8. Tête à écrire selon les revendications 1 à 7, caractérisée en ce que le canal de distribution (17) est en forme de U, l'aile (18) de cet U servant de canal d'amission d'encre liquide, la traverse (17) reliant les ailes de l'U servant le canal de distribution proprement dit tandis que l'autre aile (19) de l'U sert de canal de désaérage.
9. Procédé de fabrication d'une tête à écrire selon les revendications 1 à 8, caractérisé en ce que chaque canal à tuyère (1) est d'abord façonné dans sa forme désirée déterminée d'avance et muni d'un élément de commande (2), après quoi chaque canal est mis à l'essai pour son fonctionnement et éjection de gouttelettes impeccables, aligné ensuite dans un support (12) et scellé dans un bloc en matière synthétique (10), tandis qu'après cette opération, ledit bloc est découpé à son extrémité arrière de façon à acquérir une surface plane qui est perpendiculaire aux extrémités des canaux à tuyère (1), et ensuite raccordé au canal de distribution (17) qui est noyé également dans un bloc en matière synthétique (15).
10. Procédé selon la revendication 9, caractérisé en ce qu'après l'assemblage des constituants de la tête à écrire et l'introduction d'encre liquide dans le canal de distribution, il est procédé à la mesure de l'émission de gouttelettes des canaux à tuyère, alors que par ajustement des éléments de commande, les émissions de gouttelettes sont accordées les unes aux autres.
11. Procédé selon la revendication 10, caractérisé en ce que les éléments de commande sont accordés les uns aux autres du fait qu'une des électrodes des éléments de commande dont le canal à tuyère donne lieu à une émission de gouttelettes qui diffère de l'émission définie d'avance est réduite dans une mesure plus ou moins grande jusqu'à l'obtention de cette émission désirée.
12. Procédé pour l'excitation des éléments de commande d'une tête à écrire selon les revendications 1 à 8, caractérisé en ce que sous l'influence de la tension d'excitation, le ménisque de liquide se trouvant dans la tuyère d'un canal à tuyère, est d'abord aspiré légèrement dans le canal et éjecté seulement ensuite.
13. Tête à écrire multiple, caractérisée en ce qu'au moins deux têtes à écrire selon les revendications 1 à 8 sont élaborées l'une à côté de l'autre et rendues solidaires l'une de l'autre.
EP82200100A 1981-02-06 1982-01-28 Tête à écrire pour une imprimante à jet d'encre Expired EP0057956B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813104077 DE3104077A1 (de) 1981-02-06 1981-02-06 "schreibkopf fuer tintenstrahldrucker"
DE3104077 1981-02-06

Publications (3)

Publication Number Publication Date
EP0057956A2 EP0057956A2 (fr) 1982-08-18
EP0057956A3 EP0057956A3 (en) 1983-08-03
EP0057956B1 true EP0057956B1 (fr) 1986-04-23

Family

ID=6124173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200100A Expired EP0057956B1 (fr) 1981-02-06 1982-01-28 Tête à écrire pour une imprimante à jet d'encre

Country Status (5)

Country Link
US (1) US4414552A (fr)
EP (1) EP0057956B1 (fr)
JP (1) JPS57148663A (fr)
CA (1) CA1176689A (fr)
DE (2) DE3104077A1 (fr)

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DE3234408C2 (de) * 1982-09-16 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Schreibkopf mit piezoelektrischen Antriebselementen für Tintenschreibeinrichtungen
US4727012A (en) * 1984-10-25 1988-02-23 Siemens Aktiengesellschaft Method of manufacture for print heads of ink jet printers
JPH03169636A (ja) * 1989-11-30 1991-07-23 Juki Corp インク噴射ノズル装置
IT1272050B (it) * 1993-11-10 1997-06-11 Olivetti Canon Ind Spa Dispositivo stampante parallelo con struttura modulare e relativo procedimento di realizzazione.
US5958342A (en) * 1996-05-17 1999-09-28 Incyte Pharmaceuticals, Inc. Jet droplet device
US5901425A (en) * 1996-08-27 1999-05-11 Topaz Technologies Inc. Inkjet print head apparatus
US7163284B2 (en) * 2001-12-12 2007-01-16 Industrial Technology Research Institute Multi-reagent inkjet cartridge
KR20060112870A (ko) * 2005-04-28 2006-11-02 삼성전자주식회사 압전 소자 및 이를 갖는 프린터 헤드
GB2549720A (en) * 2016-04-25 2017-11-01 Jetronica Ltd Industrial printhead
CN109664616A (zh) * 2018-11-29 2019-04-23 佛山市南海永恒头盔制造有限公司 异形物体表面印刷喷头

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US3832579A (en) * 1973-02-07 1974-08-27 Gould Inc Pulsed droplet ejecting system
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
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Also Published As

Publication number Publication date
EP0057956A3 (en) 1983-08-03
DE3270704D1 (en) 1986-05-28
EP0057956A2 (fr) 1982-08-18
CA1176689A (fr) 1984-10-23
JPS57148663A (en) 1982-09-14
DE3104077A1 (de) 1982-09-09
US4414552A (en) 1983-11-08

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