EP0150348B1 - Tête d'impression à jet d'encre - Google Patents

Tête d'impression à jet d'encre Download PDF

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Publication number
EP0150348B1
EP0150348B1 EP84114845A EP84114845A EP0150348B1 EP 0150348 B1 EP0150348 B1 EP 0150348B1 EP 84114845 A EP84114845 A EP 84114845A EP 84114845 A EP84114845 A EP 84114845A EP 0150348 B1 EP0150348 B1 EP 0150348B1
Authority
EP
European Patent Office
Prior art keywords
piezo
plates
ink
printing head
spacer elements
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
EP84114845A
Other languages
German (de)
English (en)
Other versions
EP0150348A2 (fr
EP0150348A3 (en
Inventor
Emmeran Ing. Grad. Vollert
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0150348A2 publication Critical patent/EP0150348A2/fr
Publication of EP0150348A3 publication Critical patent/EP0150348A3/de
Application granted granted Critical
Publication of EP0150348B1 publication Critical patent/EP0150348B1/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
    • B41J2/145—Arrangement thereof
    • 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
    • B41J2002/14306—Flow passage between manifold and chamber

Definitions

  • the invention relates to a write head for ink writing devices with piezoelectric drive elements according to the preamble of claim 1.
  • the essential operating principle of ink writing devices is based on the fact that under the action of a transducer element, preferably a piezoelectric transducer or drive element, ink is ejected drop by drop from an ejection nozzle.
  • a transducer element preferably a piezoelectric transducer or drive element
  • the piezoelectric drive elements and the ink channels with the outlet openings and the feeds for the ink from a supply system are combined in a so-called write head.
  • the drive elements are in the form of piezo tubes which enclose the ink channels over part of their length. With a suitable control of a piezo tube, its geometric dimension changes and a pressure or shock wave is generated in the interior of the ink channel.
  • the drive element consists of a comb-shaped piezoceramic material, the prongs of which are each arranged in front of an outlet opening.
  • the tines of the piezo comb act like bending vibrators, i.e. H. they move rapidly in the direction of the outlet opening assigned to them and in this way bring about an ejection of droplets.
  • the problems associated with a printhead arranged in this way consist essentially in the fact that special measures must be taken to dampen and limit the effects of secondary speech. These have a disruptive effect especially when operating such a print head.
  • the object of the invention is to provide a writing head for ink writing devices which can be produced without any significant effort, which allows a narrow division of the outlet openings and thus a very large number of outlet openings without the use of a nozzle plate, which ensures safe operation when droplet ejection and at the same time with low Control voltages works.
  • One of the main advantages of the write head according to the invention is the reduction in production costs, since the formation of the ink channel, ink chamber, drive and throttle area, which previously required several successive work steps, is now already achieved by the shape of the piezo drive. Associated with this is the further advantage that only small control voltages are required to control the piezo drives.
  • the advantageous embodiments specified in the subclaims relate to the shaping of the piezoplates used as drive elements and the spacer elements, the control of the drive elements, in particular the contacting and the ink heating.
  • the specified configurations are particularly advantageous with regard to the manufacture of the print heads.
  • FIG. 1 shows in section a write head constructed according to the invention with the details necessary for understanding the invention.
  • Piezo plates 1, which have recesses 2, 3, 4 and 5 shaped in a certain way, are provided as drive elements for droplet ejection.
  • the recess 2 represents the outlet opening of the writing head. It widens, in the example according to FIG. 1 downwards, to the actual ink chamber 3. This is followed by a vera supply 4, which acts as a throttle. Finally, in the lower area, the circular ink supply 5 is provided in the example.
  • the piezoplates 1 designed in this form are each grouped close together by a spacer 6.
  • the spacer elements 6 also have correspondingly shaped openings 7 in the region of the ink supply opening 5.
  • the entirety of the piezoplates 1 and the spacer elements 6 are held in a common block 8.
  • the number of piezo platelets 1 and thus the number of outlet openings 2 of the writing head can be adapted to the requirements that are recently placed on nozzle writing heads. For example, 32 or 48 outlet nozzles are possible without the external dimensions of the write head exceeding the usual size.
  • the two conductor foils 9a and 9b are provided for contacting the piezoplates.
  • the piezo plates 1 are dip-soldered at the corners, for example in packets, via these.
  • the printhead arrangement consisting of the described parts can be surrounded by a cover 10 which is designed in accordance with the desired external shape of the printhead. Both the common block 8 and the outer cover 10 are advantageously plastic parts.
  • the cover 10 has nose-shaped lugs 11, which ensure that the nozzle opening dimensions are observed.
  • FIG. 2 shows a sectional illustration of the disk head according to FIG. 1 along the section line AB. It. it can be seen more clearly here that the piezo plates 1 each protrude laterally beyond the spacer elements 6. This enables contacting with the conductor foils 9a and 9b in a simple manner. It can be seen in FIG. 1 that one side of a piezo plate is contacted via the left conductor foil 9a and the other side is contacted via the right conductor foil 9b.
  • a write head shown in FIGS. 1 and 2 is as follows. With a corresponding activation of a piezo plate 1 via the connections 9a and 9b, depending on the direction of polarization of the piezo material and the polarity of the activation pulse, either an expansion or a contraction of the regions determined by the recesses occurs. In particular, the changes in shape of the piezo material have an effect in the area of the ink chamber 3.
  • droplet ejection occurs as follows. Starting from a state of rest, during which the outlet opening 2 is either completely or almost closed, the expansion phase is initiated with a control pulse of appropriate polarity. The areas 2, 3, 4 and 5 expand in the process.
  • the change in the thickness or thickness of the piezoplates associated with a change in shape of the piezoplates is completely or largely absorbed by the elasticity of the spacer elements. This supports the suction process during the expansion phase and the exhaust process during the contraction phase. Since the arrangement has only short paths, in particular there are no long ink channels, there are no additional flow resistances. This means that you can work with significantly lower control voltages.
  • Spacers made of hard, conductive and elastic, non-conductive material can be used alternately as spacer elements which separate the individual piezoplates.
  • Fig. 3 shows a corresponding arrangement. This is a sectional view along the section line AB in FIG. 1.
  • the piezoplates 1 are each separated by non-conductive spacer elements 6 and by conductive spacer elements 6a.
  • the contact surfaces of two piezoplates are controlled jointly via the conductive spacer elements 6a. In the example, this is done via the conductor foil 9a.
  • the respective other contact surface of the piezoplates 1 is contacted via the second conductor film, in the example via the conductor film 9b.
  • the successive piezoplates 1 each have directions of polarization rotated by 180 °.
  • the conductive spacer elements 6a which are, for example, metal platelets, also serve to conduct heat in order to keep the ink temperature constant. At the same time, the contacting effort is reduced.
  • the spacer elements are constructed in a sandwich-like manner. 4 shows an example of this.
  • the conductive metal layer 6c of a spacer element also serves as a pressure wave-inhibiting material for contacting and as a heat exchanger.
  • the non-conductive material 6b of a spacer element serves to absorb the pressure waves. This structure is associated with a significant reduction in crosstalk.
  • the recesses in the piezoplates have straight cutting edges.
  • FIGS. 5 and 6 An example of this is shown in FIGS. 5 and 6.
  • a piezoplate 13 is shown in FIG. 5 and a spacer element 14 in FIG. 6.
  • the advantage of this configuration lies above all in the simple manufacture of the piezo drives, since the recesses in the individual piezo platelets 13 have straight cutting edges, which make z. B. allow in an automated cutting process.
  • the construction of a print head with the Art designed piezo plate 13 and spacer elements 14 is done in the manner described with reference to FIG. 1. By alternately joining them together, a multiplicity of ink chambers 3 are formed, each of which is connected to an outlet opening 2 and to a throttle region 4.
  • the ink chambers 3 are supplied with ink from an ink reservoir (not shown here) via the common ink channel 5, 7.
  • the unit formed from the piezoplates 13 and the spacer elements 14 is contacted via conductor foils and held in a common block.
  • the mode of operation reference is also made to the description of FIGS. 1 and 2.
  • a piezo plate as the piezo drive element, in which the recesses are arranged only on one side, and in which the areas forming the outlet opening, the ink chamber, the throttle channel and the ink supply channel, on the one hand through the recesses, the piezo plates and on the other hand, are formed and delimited by a lateral wall of the common block or the outer cover.
  • FIG. 7 An exemplary embodiment of this embodiment is shown in FIG. 7.
  • the piezo plates 15 have recesses on one side with straight cut edges, which each form the boundary of the outlet opening 2, the ink chamber 3, the throttle channel 4 and the ink supply channel 5.
  • the respective other limitation is formed here by the wall of block 8.
  • the plate-shaped spacer elements 16 also have recesses with straight cut edges, which together with the corresponding recesses 5 in the piezo plates 15 form the common ink supply.
  • the piezo plates 15 and the spacer elements 16 are firmly connected to one another, the change in shape of the piezo plates which is decisive for droplet ejection largely affects only the areas of the outlet opening 2, the ink chamber 3, the throttle duct 4 and the feed duct 5.
  • Such a connection is indicated in FIG. 7 by the region 18 delimited by the dashed line 17.
  • the piezoplates 15 and the spacing elements 16 are connected in the region 18 by gluing. In this way it is achieved that a deformation of the piezoplates 15 due to corresponding control pulses largely affects only the ink area 3, 4, 5.
  • the piezoplates are contacted on both sides.
  • FIG. 7 An exemplary embodiment of this is also shown in FIG. 7, in which the insulating coating 19, indicated by a dash-dotted line, is applied to the piezoplate 15 along the cut edges delimiting the ink area 2, 3, 4, 5.
  • insulating coating 19 can also be provided on the piezoplates shaped according to the previously described configurations.
  • Fig. 8 shows an embodiment of the write head within the scope of the invention, which is characterized in that the write head is equipped with an additional device for receiving waste ink.
  • the example shown in FIG. 8 shows the write head already described with reference to FIG. 1 with the reference symbols used there. In this case, the cover 10 is widened somewhat and has a recess, for example for a felt ring 20.
  • the felt ring 20 is preferably fastened in a holder 21 which can be replaced manually if necessary.
  • the top surface of the cover may be slightly beveled in the direction of the felt ring 20.
  • the write head according to the invention can also have devices for heating the ink in the region of the outlet openings or for heating the ink in the entire write head.
  • ink heating can also take place in that a heating plate or heating coil is inserted in the common block.
  • Temperature sensing elements can preferably be arranged in the region of the outlet openings on both sides of the outlet openings.
  • the write head according to the invention is particularly suitable for mass production, since the individual operations required for its manufacture can be easily automated. There is also no need to use a separate nozzle plate arranged in front of the outlet openings of the ink channels, so that there are also significant savings in terms of the number of parts. Furthermore, the problems associated with the production of extremely narrow and very small nozzle openings when casting with resin are also eliminated.

Landscapes

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

Claims (12)

1. Tête d'impression pour dispositifs d'impression à encre, comportant des organes d'entraînement piézoélectriques, dont la forme varie sous l'action d'impulsions de commande polarisées de façon appropriée et sous l'action desquels de l'encre est aspirée depuis un réservoir d'encre, par l'intermédiaire d'un canal commun d'adduction de l'encre, pendant une phase d'expansion et un petit volume d'encre est éjecté sous la forme d'une gouttelette d'encre, pendant une phase de contraction intervenant à la suite de la phase d'expansion, caractérisée par le fait qu'il est prévu, comme éléments d'entraînement piézoélectriques, des plaquettes piézoélectriques (1, 13, 15), qui sont reliées par des contacts sur leurs deux côtés et possèdent respectivement des évidements (2, 3, 4, 5), qui forment une ouverture supérieure (2), dans une zone supérieure, une chambre (3) de réception de l'encre, dans une zone médiane élargie, un canal à étranglement (4) dans une zone rétrécie se raccordant à la zone précédente, et une ouverture (5) d'alimentation de l'encre, dans une zone inférieure à nouveau élargie, que les plaquettes piézoélectriques (1, 13, 15) sont disposées les unes à côté des autres moyennant l'interposition d'entretoises respectives (6, 6a, 6b, 6c, 14,16), les entretoises (6, 6a, 6b, 6c, 14, 16) comportant, dans la zone des ouvertures (5) d'alimentation de l'encre, des ouvertures (16) qui correspondent aux précédentes, et que les plaquettes piézoélectriques (1, 13, 15) et les entretoises (6, 6a, 6b, 6c, 14, 16) sont maintenues dans un bloc commun (8).
2. Tête d'impression suivant la revendication 1, caractérisée par le fait que les évidements (2, 3, 4, 5) des plaquettes piézoélectriques (1) et les ouvertures (7) des entretoises (6, 6a, 6b, 6c) possèdent des arêtes de coupe de forme courbe, approximativement symétriques entre elles et qui limitent les zones contenant l'encre à l'intérieur de la tête d'impression.
3. Tête d'impression suivant la revendication 1, caractérisée par le fait que les évidements (2, 3, 4, 5) des plaquettes piézoélectriques (13, 15) et les ouvertures (7) des entretoises (14) possèdent des arêtes de coupe rectilignes approximativement symétriques entre elles et qui limitent les zones contenant l'encre à l'intérieur de la tête d'impression.
4. Tête d'impression suivant la revendication 1, caractérisée par le fait que les évidements des plaquettes piézoélectriques (15) sont ménagés dans uniquement un côté d'une plaquette piézoé- lectrique (15) et possèdent respectivement des arêtes de coupe rectilignes, et que les zones contenant l'encre à l'intérieur de la tête d'impression sont limitées d'une part par les arêtes de coupe et d'autre part par la paroi intérieure du bloc commun (8).
5. Tête d'enregistrement suivant l'une des revendications 1 à 4, caractérisée par le fait que les plaquettes piézoélectriques (1, 13, 15 ; figure 7) comportent, le long des arêtes de coupe et sur une partie de leur surface, un revêtement isolant (19).
6. Tête d'impression suivant l'une des revendications 1 à 5, caractérisée par le fait que, lorsque les plaquettes piézoélectriques (1, 13, 15) sont à l'état de repos, l'ouverture de sortie (2), qui est formée par la zone supérieure de l'évidement, possède une section transversale définie qui s'élargit pendant la phase d'expansion et se rétrécit pendant la phase de contraction.
7. Tête d'impression suivant l'une des revendications 1 à 6, caractérisée par le fait que lorsque les plaquettes piézoélectriques (1, 13, 15) sont à l'état de repos, l'ouverture de sortie (2), qui est formée par la partie supérieure de l'évidement, est fermée et s'ouvre uniquement pendant la phase d'expansion jusqu'à la fin de la phase de contraction.
8. Tête d'impression suivant la revendication 7, caractérisée par le fait que les plaquettes piézoélectriques (15 ; figure 7) et les entretoises (14) sont reliées entre elles (18) unilatéralement sur le côté tourné à l'opposé de la zone (2, 3, 4, 5) contenant l'encre.
9. Tête d'impression suivant l'une des revendications 1 à 8, caractérisée par le fait que les entretoises (6) sont constituées par un matériau non conducteur et que pour la commande des plaquettes piézoélectriques (1), il est prévu une feuille conductrice (9a, 9b), dont les voies conductrices sont reliées aux surfaces de contact des plaquettes piézoélectriques (1) (par l'intermédiaire de 12).
10. Tête d'impression suivant l'une des revendications 1 à 8, caractérisée par le fait que les entretoises (6, 6a) sont constituées en alternance par un matériau élastique non conducteur (6) et par un matériau conducteur, non élastique (6a), qu'une surface respective de contact entre deux plaquettes piézoélectriques (1) successives est reliée par l'intermédiaire d'une entretoise conductrice (6a) à l'une des feuilles conductrices (9a) et que les autres surfaces de contact des plaquettes piézoélectriques (1) sont reliées respectivement individuellement à l'autre feuille conductrice (9b), et que des plaquettes piézoélectriques (1) successives sont polarisées respectivement en sens opposé.
11. Tête d'impression suivant la revendication 10, caractérisée par le fait que les entretoises (6b, 6c ; figure 4) sont constituées par deux couches, une couche (6b) étant constituée en un matériau élastique non conducteur et l'autre couche (6c) étant constituée en un matériau conducteur non élastique.
12. Tête d'impression suivant la revendication 1, caractérisée par le fait que le bloc commun (8) est entouré par un capot (10) et que seule la partie qui possède les ouvertures de sortie (2) des plaquettes piézoélectriques (1), reste dégagée, et qu'il est prévu dans le capot (10), un insert (20) interchangeable, qui reçoit l'encre perdue, peut exécuter une aspiration et entoure au moins partiellement le bloc commun (8).
EP84114845A 1984-02-02 1984-12-06 Tête d'impression à jet d'encre Expired EP0150348B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843403615 DE3403615A1 (de) 1984-02-02 1984-02-02 Schreibkopf fuer tintenschreibeinrichtungen
DE3403615 1984-02-02

Publications (3)

Publication Number Publication Date
EP0150348A2 EP0150348A2 (fr) 1985-08-07
EP0150348A3 EP0150348A3 (en) 1985-08-21
EP0150348B1 true EP0150348B1 (fr) 1987-11-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114845A Expired EP0150348B1 (fr) 1984-02-02 1984-12-06 Tête d'impression à jet d'encre

Country Status (4)

Country Link
US (1) US4578686A (fr)
EP (1) EP0150348B1 (fr)
JP (1) JPS60180850A (fr)
DE (2) DE3403615A1 (fr)

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DE3630206A1 (de) * 1985-09-06 1987-03-19 Fuji Electric Co Ltd Tintenstrahldruckkopf
US5172141A (en) * 1985-12-17 1992-12-15 Canon Kabushiki Kaisha Ink jet recording head using a piezoelectric element having an asymmetrical electric field applied thereto
JPS62140851A (ja) * 1985-12-17 1987-06-24 Canon Inc インクジエツト記録ヘツド
US4752789A (en) * 1986-07-25 1988-06-21 Dataproducts Corporation Multi-layer transducer array for an ink jet apparatus
US4887100A (en) * 1987-01-10 1989-12-12 Am International, Inc. Droplet deposition apparatus
US4823149A (en) * 1987-03-09 1989-04-18 Dataproducts Corporation Ink jet apparatus employing plate-like structure
US4843407A (en) * 1987-08-18 1989-06-27 Burlington Industries, Inc. Fluid distribution bar for fluid-jet printing
US5500658A (en) * 1987-09-11 1996-03-19 Canon Kabushiki Kaisha Ink jet recording apparatus having a heating member and means for reducing moisture near an ink discharge port of a recording head
NL8903025A (nl) * 1989-12-08 1991-07-01 Oce Nederland Bv Stapelbare druppelgenerator voor een ink-jet printer.
EP0486256B1 (fr) * 1990-11-13 1997-08-13 Citizen Watch Co., Ltd. Tête d'impression pour imprimante à jet d'encre
JPH0528637U (ja) * 1991-03-08 1993-04-16 シチズン時計株式会社 インクジエツトヘツドの駆動電極引き出し構造
US5444474A (en) * 1992-03-23 1995-08-22 Matsushita Electric Industrial Co., Ltd. Ink-jet cartridge for ink-jet printers and ink-jet printer using the same
US5534904A (en) * 1994-11-07 1996-07-09 Meir Weksler Multi-jet generator device for use in printing
US6190002B1 (en) 1999-10-27 2001-02-20 Lexmark International, Inc. Ink jet pen
JP3861673B2 (ja) * 2001-11-30 2006-12-20 ブラザー工業株式会社 インクジェット記録ヘッド
JP3925639B2 (ja) * 2002-06-27 2007-06-06 ブラザー工業株式会社 インクジェット記録ヘッド
JP4654640B2 (ja) * 2004-09-13 2011-03-23 富士ゼロックス株式会社 インクジェット記録ヘッド、及び、インクジェット記録ヘッド製造方法
US20080061471A1 (en) * 2006-09-13 2008-03-13 Spin Master Ltd. Decorative moulding toy
US7914125B2 (en) 2006-09-14 2011-03-29 Hewlett-Packard Development Company, L.P. Fluid ejection device with deflective flexible membrane
US7651204B2 (en) * 2006-09-14 2010-01-26 Hewlett-Packard Development Company, L.P. Fluid ejection device
US8042913B2 (en) * 2006-09-14 2011-10-25 Hewlett-Packard Development Company, L.P. Fluid ejection device with deflective flexible membrane
GB2599902A (en) * 2020-10-11 2022-04-20 Mesa Tech Ltd Printing apparatus and method

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US4390886A (en) * 1981-09-25 1983-06-28 Xerox Corporation Ink jet printing machine

Also Published As

Publication number Publication date
JPS60180850A (ja) 1985-09-14
US4578686A (en) 1986-03-25
DE3403615A1 (de) 1985-08-08
EP0150348A2 (fr) 1985-08-07
DE3467329D1 (en) 1987-12-17
EP0150348A3 (en) 1985-08-21

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