EP1219439B1 - Tête d'impression par jet d'encre - Google Patents

Tête d'impression par jet d'encre Download PDF

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Publication number
EP1219439B1
EP1219439B1 EP01130850A EP01130850A EP1219439B1 EP 1219439 B1 EP1219439 B1 EP 1219439B1 EP 01130850 A EP01130850 A EP 01130850A EP 01130850 A EP01130850 A EP 01130850A EP 1219439 B1 EP1219439 B1 EP 1219439B1
Authority
EP
European Patent Office
Prior art keywords
ink chamber
elements
tension
ink
inkjet printer
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 - Lifetime
Application number
EP01130850A
Other languages
German (de)
English (en)
Other versions
EP1219439A1 (fr
Inventor
Jan Slomianny
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.)
Bauer Wulf
Original Assignee
Bauer Wulf
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 Bauer Wulf filed Critical Bauer Wulf
Publication of EP1219439A1 publication Critical patent/EP1219439A1/fr
Application granted granted Critical
Publication of EP1219439B1 publication Critical patent/EP1219439B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17596—Ink pumps, ink valves
    • 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
    • B41J2202/05—Heads having a valve

Definitions

  • Such inkjet printheads are used in particular in matrix printers used and are for example from EP 0 445 137 B1 and DE 36 25 067 A1 known.
  • a print head of a matrix printer is characterized in that it has a Large number of closely spaced, movable locking bodies has closed expression openings or outlet openings. Under a matrix becomes a two-dimensional or a one-dimensional arrangement understood by several outlet openings.
  • the aforementioned ink jet printheads are used in particular as printheads used for marking devices with which labeling on objects, for example packs is applied.
  • the outlet openings the printhead by lifting the closing body briefly released, so that overpressurized ink on the printable Surface can be brought.
  • every closing body assigned traction elements by means of the controllable traction device actuates that the desired labeling on the surface to be printed arises.
  • the individual outlet openings with a minimum distance from each other are.
  • the pulling devices usually Electromagnets have dimensions such that these not as close together as the outlet openings can. Therefore, between the closing bodies and the associated Traction devices arranged traction elements of such a length that the Traction devices can be arranged fanned out side by side.
  • the Drive movements of the pulling devices are based on the pulling elements transmit the closing body, the traction elements, for example, as Pull ropes or wires or can also be designed as pull rods.
  • each outside the ink chamber, between one Actuating opening and the associated tie rod are arranged.
  • Actuating opening are those openings through which the Traction element is led out of the housing of the ink chamber.
  • This So-called tie rod seals are in the axial direction of as tie rods executed tension elements deformable and both with the actuation opening as well as firmly connected to the pull rod.
  • the tie rod seals are frustoconical, the other end at Edge of the actuating opening is attached sealingly and the narrower end of the Seals around the tie rod.
  • the ink is thus in contact with moving parts (Pull bar).
  • moving parts Pull bar
  • ink often crystallizes out over time or components of the ink are excreted or deposited. If it is not used at times, it can also dry out Ink come. Mechanical movements can be caused by such deposits or influenced by the dried ink and possibly be affected.
  • there is an exchange of the tie rod seals is only possible with relatively great effort.
  • the sealing elements disclosed in DE 36 25 067 A1 are also outside the ink chamber, in which oppose the ink chamber End area of guide tubes for the tension elements, here wire ropes, arranged.
  • the sealing elements are preferably in the vicinity of the respective one Traction devices arranged and for example as opposite the traction device tight bellows.
  • the pressure increases standing ink from the ink chamber through the guide tubes to designed as a bellows seal.
  • the traction rope to be moved is surrounded by ink, which is why here too caused by crystallization or other types of deposits May result in impairments for the mechanically movable parts.
  • the maintenance and repair, especially the exchange of Seals are also difficult and time consuming.
  • the object of the present invention is a generic Improve inkjet printhead to be an impairment of the mechanical movements, especially in the area the traction elements and / or the traction device is minimized as far as possible.
  • the inkjet print head should have the longest possible technical service life have and the manufacture and maintenance as simple and be inexpensive to carry out.
  • this is achieved in that one sealing element in each case the area of a tension element protruding into the ink chamber completely encloses and the associated actuation opening seals against the ink chamber, the sealing element is designed such that it has the closing body with its free end forms for the outlet opening.
  • the arrangement of the sealing elements within the ink chamber causes advantageously that the ink pressure or that with about 1 bar under pressure standing ink, has a sealing effect on the sealing elements, since these pressed against the guide tubes or in the direction of the actuation openings become.
  • the pressure inside the ink chamber with constant or even increasing sealing effect of the sealing elements also increased significantly be (for example up to 10 bar).
  • a high pressure is among other things also to be preferred because it is in the types of inks used often highly viscous liquids.
  • the sealing elements can that are already built into the inkjet print head, as pull rods executed traction elements are plugged in, so that an exchange defective Sealing elements can be done quickly and easily. This is special then advantageous if the front wall of the ink chamber from the outside is removable.
  • the guide tubes for the Pull rods through the actuation openings into the ink chamber, so that the sealing elements both on the tie rods and on the guide tubes can be pushed on. This also ensures one complete sealing if the sealing elements are not on the inside the wall of the ink chamber having the actuating openings issue.
  • the sealing elements can advantageously on their inner sides at least one, preferably two annular, transverse to the longitudinal axis of the Sealing elements have running beads (O-rings) on the guide tubes or tie rods.
  • the sealing effect of the sealing elements is additionally improved.
  • the sealing elements can also constrictions or formations have, each to an annular, opposite the inner surfaces of the Sealing elements protruding, running transversely to the longitudinal axis Lead to narrowing.
  • the sealing elements are on the Drawbars held better, on the other hand results when the Drawbars a defined expansion of the sealing elements. These wide between the constriction and the the end facing the actuating opening crowned.
  • the sealing elements fulfill two mutually independent Tasks.
  • the section facing the associated actuation opening effects the sealing of the ink chamber and that of the associated one Section facing the outlet opening effects the closing function.
  • the closing body itself formed by the sealing elements and because the sealing elements are made of an elastic, rubber-like Material, the sealing of the outlet openings is guaranteed and it can be higher in terms of the length of the sealing elements Manufacturing tolerances are accepted.
  • the closing bodies are firmly attached to the tension elements due to the one-piece production held and are still quick and easy to assemble or disassemble.
  • the sealing elements have starting from the outlet openings a truncated cone Section that merges into an approximately cylindrical section, wherein the narrower end faces of the frustoconical section each have the outlet openings closure.
  • the conical shape of the sealing elements causes the ink to flow better towards the outlet openings, which in turn results in less swirling of the ink Has.
  • the seal of the ink chamber against penetrating from the outside Soiling can also be improved if the outside sections of the guide tubes arranged in the ink chamber additional sealants are closed. For example, as Capillary hoses made sealing elements on the above sections of the guide tubes are pushed on so that they also tightly enclose the drawbar.
  • Lubrication of the tension elements can also be achieved by that the openings of the guide tubes arranged outside the ink chamber also be charged with an oil.
  • the ink jet print head according to the invention has an extremely small Susceptibility to faults because, on the one hand, the ink chamber completely against the outside Dirt is sealed and secondly the ink is not in can reach the area of the moving parts.
  • the inkjet print head also builds very small and can be maintained and repaired quickly and efficiently, since the sealing elements after opening the ink chamber can be easily exchanged.
  • An inkjet write head 1 has one in a housing 2 arranged ink chamber 4.
  • the essentially cubic Ink chamber 4 is through a front wall 6, side walls 8 and a rear wall 10 limited.
  • the front wall 6 is preferably detachable from the housing 2 connected and via a preferably designed as an O-ring 12 Sealed gasket.
  • Outlet openings 14 are arranged in the front wall 6, the nozzle 16 for ink emerging during the printing process Act.
  • the term ink 16 means all for labeling and marking suitable substances such as lacquers, acids, etc.
  • the Area surrounding outlet openings 14 is in the direction of the ink chamber 4 curved, with the outlet openings 14 in the center of the curvature 18 are arranged.
  • the curvature 18 has two advantageous advantages Effect.
  • the outlet openings 14 are in the direction of their Longitudinal axes X-X lengthened, resulting in better guidance of the emerging Ink drop is reached, which in turn requires a more precise print image.
  • they are directed towards the ink chamber 4 Arches 18 for better sealing of the outlet openings 14 by closing bodies 20 lying against the outlet openings 14 are the surfaces of the closing bodies 20 which abut the outlet openings 14 executed essentially plan.
  • the at the outlet openings 14 adjacent surfaces of the closing body 20 are also curved be executed. It is also possible to use both contact surfaces Closing body 20 and the area around the outlet openings 14), plan to execute.
  • Each closing body 20 is a pull element 22, preferably a pull rod assigned, the coaxial to the longitudinal axis X-X of the respective outlet opening 14 runs.
  • the tension elements 22 extend through actuating openings 24 arranged in the rear wall 10 and are connected to pulling devices, not shown.
  • the tension elements 22 have a diameter of, for example Have 1 to 1.2 mm and be designed as a hollow pull tube to to achieve a material and thus a weight reduction.
  • Traction devices are particularly suitable for electromagnets that have a Achieve stroke of the closing body 20 of, for example, about 0.2 mm.
  • the tension elements 22 are in the guide tubes 26 out.
  • the ink 16 passes through a bore 32 from a Ink container, not shown, the connection end 34 with the in one of the side walls 8 arranged bore 32 is connected under Overpressure in the ink chamber 4.
  • the actuation openings 24 are opposite those in FIG Ink chamber 4 located ink 16 each through a sealing element 36 sealed.
  • the sealing elements 36 advantageously enclose them the areas of the tension elements 22 projecting into the ink chamber 4 the embodiment shown enclose the sealing elements 36 not only the tension elements 22, but also the ink chamber sections 28 of the guide tubes 26, and thus seal the actuation openings 24 off safely.
  • the sealing elements 36 can easily on the tension elements 22 and guide tubes 26 or their ink chamber sections 28 be postponed.
  • the tension elements 22 one in each of its end regions facing the outlet openings 14 annular, transverse to the longitudinal axis X-X groove 38 in which the respective Sealing element 36 comes to rest.
  • a particular advantage of the sealing elements according to the invention 36 lies in the fact that it itself acts directly as a closing body 20 act because the consist of an elastic rubber-like material Sealing elements 36 bear against the outlet openings 14. Additional Closing body elements are omitted.
  • Figure 1 shows a first embodiment of the sealing element according to the invention 36.
  • This is essentially cylindrical and has a thinned wall section 40 in the middle.
  • This wall section 40 facilitates the deformation of the sealing element 36 when the pulling device is actuated or when the Closing body 20 from the outlet opening 14.
  • the wall section 40 can then preferably deform inwards.
  • Figure 2 shows an advantageous further embodiment of the inventive Sealing element 36.
  • the design of the frustoconical section 44 has Consequence that the pressurized ink towards the outlet opening 14 is steered. This enables high printing speeds and realize an exact print image.
  • the overpressure in the ink chamber is, for example, 1 bar, which also minimizes swirling of the ink 16 become.
  • the sealing element 36 in the area between the outlet opening 14 and near the end of the ink chamber portion 28 of the guide tube 26 is a constriction 46 instead of the thinned wall section 40 shown in FIG. 1 having.
  • the constriction 46 has the effect that when the pulling elements are actuated 22 a defined expansion of the constriction 46 and that end of the sealing element 36 which faces the actuating opening 24 limited area results. Through this relatively long section, a gentle deformation of the sealing element 36 is achieved, which in turn the durability of the sealing element 36 is significantly extended.
  • the technical life of the inkjet write head 1 can be additional be prolonged by the penetration of dirt particles or deposits through the actuating openings 24 in the area of Traction elements 22 is avoided by closing means.
  • This can essentially be can be achieved in that the outer sections 30 of the guide tubes 26 can also be closed with sealants 50.
  • This are advantageously tubular and consist of an elastic Material, preferably the material from which the sealing elements 36 are made.
  • the sealing means 50 in particular capillary tubes, are on the tension elements 22 or on the outer sections of the guide tubes 26 pushed on and enclose them. Because of their elasticity the sealing means 50 hinder the movement of the tension elements 22 Not.
  • the actuation openings 24 or the corresponding ends the guide tubes 26 are charged with an oil 48 for lubrication to reach the tension elements 20.
  • Ends of the guide tubes 26 in a further embodiment variant according to the invention flared ends 52.
  • These are in the postponed Sealing elements 36 in areas of the thinned wall sections 40 and expand them accordingly.
  • This variant too ensures a defined, directed in the direction of expansion Deformation of the sealing elements 36 when the tension elements 22 are actuated.
  • the sealing elements 36 on the guide tubes 26 are better held.
  • the sealing elements 36 can also, as in FIG. 3 shown, on the inside at least one, preferably two have annular webs 54 (O-rings) running transversely to the longitudinal axis X-X, which abut the guide tubes 26 or the tension elements 22.
  • the sealing effect of the sealing elements is due to the small surface area 36 or the sealant 50 additionally increased.
  • Such ridges 54 can also have the sealing means 50.

Landscapes

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

Claims (10)

  1. Tète d'impression jet d'encre (1) avec
    a) une chambre à encre (4) disposée dans un boítier (2) et destinée à être remplie d'encre (16) sous surpression, des orifices de sortie (14) étant ménagés dans une paroi frontale (6) de celle-ci,
    b) des organes de fermeture (20) mobiles dans le sens de la longueur (X-X) des orifices de sortie (14) associés, chacun d'eux étant en appui sur une face interne de la paroi frontale (6) et fermant un orifice de sortie (14),
    c) des éléments de traction (22) reliés chacun à un organe de fermeture (20) qui s'étendent coaxialement au sens de la longueur (X-X) de l'orifice de sortie (14) associé et traversent un orifice d'actionnement (24) ménagé dans une paroi arrière (10) de la chambre à encre (4),
    d) des tubes de guidage (26) dans lesquels sont guidés, du moins partiellement, les éléments de traction (22),
    e) des dispositifs de traction qui sont chacun reliés à l'extrémité détournée de la chambre à encre (4) de l'un des éléments de traction (22) et
    f) des joints d'étanchéité (36), chacun d'eux isolant hermétiquement par rapport à la chambre à encre (4) un dispositif de traction de manière à empêcher l'encre (16) d'entrer en contact avec ledit dispositif de traction,
    les éléments de traction (22) étant mobiles suivant la direction axiale de telle sorte que l'organe de fermeture (20) associé est soulevé de son orifice de sortie (14) par le bref actionnement du dispositif de traction, permettant ainsi à l'encre (16) de sortir par l'orifice de sortie (14),
    caractérisée en ce que
    un joint d'étanchéité (36) entoure complètement la partie d'un élément de traction (22) respectif faisant saillie dans la chambre à encre (4), obturant ainsi l'orifice d'actionnement (24) associé de manière à le rendre étanche par rapport à la chambre à encre (4), le joint d'étanchéité (36) étant réalisé de telle sorte qu'il forme avec son extrémité libre l'organe de fermeture (20) pour l'orifice de sortie (14).
  2. Tête d'impression jet d'encre (1) selon la revendication 1, caractérisée en ce que les tubes de guidage (26) comportent une partie chambre à encre (28) faisant saillie dans la chambre à encre (4) et, à leur autre extrémité, une partie extérieure (30) faisant saillie hors du boítier (2).
  3. Tête d'impression jet d'encre (1) selon la revendication 2, caractérisée en ce que chaque joint d'étanchéité (36) entoure une partie chambre à encre (28) d'un tube de guidage (26) de manière à la rendre étanche.
  4. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les joints d'étanchéité (36) comportent une partie tronconique (42) dont l'extrémité la plus étroite obture l'orifice de sortie (14) associé au joint d'étanchéité (36) correspondant et dont l'autre extrémité forme une partie (44) en forme approximative de cylindre circulaire.
  5. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les éléments de traction (22) sont conformés en forme de tubes de traction creux.
  6. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 1 à 5, caractérisée en ce que l'élément de traction (22) comporte, dans sa partie d'extrémité faisant face à l'orifice de sortie (14) correspondant, une gorge (38) orientée transversalement à l'axe longitudinal (X-X).
  7. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 1 à 6, caractérisée en ce que les joints d'étanchéité (36) présentent au moins un étranglement (46) entre les extrémités de chacune des parties chambre à encre (28) associées des tubes de guidage (26) et chacun des orifices de sortie (14) associés, ledit étranglement (46) étant disposé de telle sorte que les joints d'étanchéité (36) se déforment entre leur étranglement (46) et leur extrémité tournée vers l'orifice d'actionnement (14) pour présenter une forme bombée.
  8. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la paroi frontale (6) est solidarisée de façon amovible au boítier (2).
  9. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'au sein de la chambre à encre (4) la zone entourant un orifice de sortie (14) est conformée en forme de courbure (18) cintrée en direction de la chambre à encre (4), l'orifice de sortie (14) associé étant disposé au centre de la courbure (18) et la surface de l'organe de fermeture (20) obturant l'orifice de sortie (14) étant plane.
  10. Tête d'impression jet d'encre (1) selon l'une quelconque des revendications 2 à 9, caractérisée en ce que les joints d'étanchéité (36) comportent, sur leurs faces internes, au moins un bourrelet annulaire orienté transversalement à l'axe longitudinal (X-X) et faisant saillie par rapport à la surface interne, ledit bourrelet étant en appui contre la partie chambre à encre (28) associée du tube de guidage (26).
EP01130850A 2000-12-29 2001-12-27 Tête d'impression par jet d'encre Expired - Lifetime EP1219439B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10065287 2000-12-29
DE10065287A DE10065287A1 (de) 2000-12-29 2000-12-29 Tintenstrahl-Schreibkopf

Publications (2)

Publication Number Publication Date
EP1219439A1 EP1219439A1 (fr) 2002-07-03
EP1219439B1 true EP1219439B1 (fr) 2003-10-22

Family

ID=7669182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01130850A Expired - Lifetime EP1219439B1 (fr) 2000-12-29 2001-12-27 Tête d'impression par jet d'encre

Country Status (3)

Country Link
EP (1) EP1219439B1 (fr)
AT (1) ATE252456T1 (fr)
DE (2) DE10065287A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2716459A1 (fr) 2012-10-02 2014-04-09 EBS Ink-Jet Systeme GmbH Tête d'écriture à jet d'encre avec élément d'étanchéité

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1031255C1 (nl) * 2006-02-28 2007-08-29 Color Wings B V Spuitkop en inrichting voor het bedrukken of bespuiten van textiele materialen.
BRPI0810982A2 (pt) 2007-04-27 2019-09-24 Wilson tool int inc novos conjuntos e métodos para processar peças de trabalho em prensas acionadas por aríete
USD751500S1 (en) 2014-08-01 2016-03-15 Wilson Tool International Inc. Battery cartridge
USD744554S1 (en) 2014-08-01 2015-12-01 Wilson Tool International Inc. Tool
USD755863S1 (en) 2014-08-01 2016-05-10 Wilson Tool International Inc. Tool
USD756452S1 (en) 2014-08-01 2016-05-17 Wilson Tool International Inc. Cartridge
US9507332B2 (en) 2014-08-01 2016-11-29 Wilson Tool International Inc. Multi-use active tool assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723131A (en) * 1986-09-12 1988-02-02 Diagraph Corporation Printhead for ink jet printing apparatus
DE3837680A1 (de) * 1988-11-05 1990-05-10 Rea Elektronik Gmbh Tintenstrahl-schreibkopf
GB8915819D0 (en) * 1989-07-11 1989-08-31 Domino Printing Sciences Plc Continuous ink jet printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2716459A1 (fr) 2012-10-02 2014-04-09 EBS Ink-Jet Systeme GmbH Tête d'écriture à jet d'encre avec élément d'étanchéité

Also Published As

Publication number Publication date
DE50100827D1 (de) 2003-11-27
ATE252456T1 (de) 2003-11-15
DE10065287A1 (de) 2002-07-04
EP1219439A1 (fr) 2002-07-03

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