EP0445137B1 - Ink jet writing head - Google Patents

Ink jet writing head Download PDF

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Publication number
EP0445137B1
EP0445137B1 EP89912438A EP89912438A EP0445137B1 EP 0445137 B1 EP0445137 B1 EP 0445137B1 EP 89912438 A EP89912438 A EP 89912438A EP 89912438 A EP89912438 A EP 89912438A EP 0445137 B1 EP0445137 B1 EP 0445137B1
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EP
European Patent Office
Prior art keywords
ink jet
sealing sleeve
tie
ink
writing head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89912438A
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German (de)
French (fr)
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EP0445137A1 (en
Inventor
Manfred Pauly
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REA Elektronik GmbH
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REA Elektronik GmbH
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Publication date
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Priority to AT89912438T priority Critical patent/ATE89221T1/en
Publication of EP0445137A1 publication Critical patent/EP0445137A1/en
Application granted granted Critical
Publication of EP0445137B1 publication Critical patent/EP0445137B1/en
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    • 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
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • 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
    • 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

  • the invention relates to an ink jet writing head, in particular for marking devices, with an ink chamber connected to an ink pressure source, in which a plurality of closure bodies, each closing an ink spray nozzle, are arranged, each of which is connected to a pull rod which is axially movable from the ink chamber through in each case an actuating opening are brought out and connected to a drive device, a connecting rod seal being arranged between each actuating opening and the pull rod.
  • Such ink-jet writing heads are used in particular as writing heads for marking devices with which labeling is applied to objects, for example packs, which are moved along the writing head.
  • the ink spray nozzles of the print head are arranged in a row close to one another and are actuated by the drive devices assigned to each individual closure body by means of a control device in such a way that the desired inscription is produced on the object being guided past.
  • a constructive difficulty of such ink jet print heads is that the individual ink spray nozzles must be arranged sufficiently close to one another, but that the drive devices, usually electromagnets, are of such dimensions that they are not as dense as the ink spray nozzles can be arranged side by side. For this reason, the drive devices are usually fanned out on both sides of the plane containing the ink spray nozzles, and their drive movement is transmitted to the closure bodies. This transmission can be carried out by flexible wires, each of which is connected on the one hand to the closure body and on the other hand to an actuating magnet as the drive device (DE-A-33 02 617). Instead, it is also known to connect each closure body to a pull rod which is connected at its end remote from the closure body to a tongue of an armature of an electromagnet.
  • the object of the invention is therefore to design an inkjet write head of the type mentioned in such a way that a complete and effective sealing of the pull rods led out of the ink chamber is made possible without impairment of function.
  • the pull rod seal is deformable in the axial direction of the pull rod and is firmly connected to both the actuating opening and the pull rod, and in that the pull rod seal is a truncated cone-shaped sealing sleeve or sealing sleeve which seals with its further end at the edge of the actuating opening is attached and with its narrower end sealingly engages around the pull rod.
  • the seal according to the invention can be made very slim. Their radial dimensions are no greater than the distance specified by the distance between adjacent ink spray nozzles.
  • the tie rod seal is designed as a truncated cone-shaped sealing sleeve, which is fastened sealingly with its further end to the edge of the actuating opening and, with its narrower end, surrounds the push rod in a sealing manner.
  • Such slim sealing sleeves can be designed, for example, as bellows. The high deformability provided by this design enables the sealing sleeve to be made of metal.
  • sealing sleeve can also be designed as an essentially smooth truncated cone; in this embodiment e.g. elastically deformable plastic or preferably rubber or rubber used.
  • ink chamber 1 has an ink chamber 2, which is connected via a line 3 to an ink pressure source (not shown), for example an ink pump.
  • ink pressure source for example an ink pump.
  • a plurality of ink spray nozzles 5 are arranged in a row in a front wall 4 of the ink chamber 2.
  • the ink jet emerging in each case from an ink spray nozzle 5 strikes an object 6 to be signed that is moved along at a distance from the wall 4, the outer surface of which is only indicated in FIG. 1 by a dash-dotted line.
  • each closure body 7 is arranged in front of each ink spray nozzle 5.
  • a pull rod 8 for example designed as a tube, which by a Actuating opening 9 is led out of the ink chamber 2 and is connected at its other end to a movable armature 10 of an electromagnet 11, which forms the drive device for the closure body 7.
  • the pull rod 8 can also be designed flexibly as a wire.
  • a seal is arranged, which is designed as a slim, truncated cone-shaped sealing sleeve or sealing sleeve 12, which is fastened sealingly with its further end to the edge of the actuating opening 9 and with its narrower end the pull rod 8 sealing embraces. Details and embodiments of this seal are shown in FIGS. 2 and 3.
  • the pull rod 8 is guided axially movably in the ink chamber 2 in a guide 13, but this does not constitute a seal for the ink.
  • a tube 14 connects to the guide 13.
  • the end of the tube 14 facing the guide 13 forms the actuating opening 9.
  • the tube end holds a bead 15 which forms the further end of the sealing sleeve 12, which is designed here as a smooth truncated cone. In this way, the sealing sleeve 12 is sealingly received in the actuation opening 9.
  • the sealing sleeve 12 tapers in the direction away from the guide 13 and encloses the tie rod 8 in a sealing manner with its narrower tubular end 16.
  • the sealing sleeve 12 consists here, for example, of elastically deformable plastic or preferably of rubber.
  • Fig. 3 differs from the embodiment of Fig. 2 in that the substantially frusto-conical sealing sleeve 12 'is a metallic bellows, which is received with its other end on the end facing away from the ink chamber 2 of the tube 14 sealing .
  • This end of the tube 14 forms the actuation opening 9.
  • the sealing sleeve 12 'tapers in the direction of the ink jet chamber 2 and encloses the pull rod 8 with its narrower end as described. Also in this embodiment, when the pull rod 8 is actuated axially, the sealing sleeve 12 is elastically deformed in the axial direction of the pull rod 8 without any sealing friction .

Abstract

An ink chamber (2) connected to an ink pressure source is arranged in an ink jet printing head (1). Several closure elements (7), each of which closes an ink jet nozzle (5), are arranged in the ink chamber (2). Each closure element (7) is connected to a drive device via a tie rod (8). Each tie rod (8) moves out of the ink chamber (2) through an actuating opening (9). A tie rod seal arranged at each actuating opening (9) consists of a slim, conical frustum-shaped sealing sleeve (12) which can be elastically deformed in the axial direction, the wider end of which is sealingly connected to the edge of the actuating opening (9) and the narrower end of which sealingly surrounds the tie rod (8). When the tie rod (8) moves axially, the sealing sleeve (12) is only deformed axially, without friction.

Description

Die Erfindung geht aus von einem Tintenstrahl-Schreibkopf, insbesondere für Signiergeräte, mit einer an eine Tintendruckquelle angeschlossenen Tintenkammer, in der mehrere, jeweils eine Tintenspritzdüse verschließende Verschlußkörper angeordnet sind, die jeweils mit einer Zugstange verbunden sind, die axial bewegbar aus der Tintenkammer durch jeweils eine Betätigungsöffnung herausgeführt und mit einer Antriebseinrichtung verbunden sind, wobei zwischen jeder Betätigungsöffnung und der Zugstange eine Zugstangendichtung angeordnet ist.The invention relates to an ink jet writing head, in particular for marking devices, with an ink chamber connected to an ink pressure source, in which a plurality of closure bodies, each closing an ink spray nozzle, are arranged, each of which is connected to a pull rod which is axially movable from the ink chamber through in each case an actuating opening are brought out and connected to a drive device, a connecting rod seal being arranged between each actuating opening and the pull rod.

Derartige Tintenstrahl-Schreibköpfe werden insbesondere als Schreibköpfe für Signiergeräte eingesetzt, mit denen eine Beschriftung auf Gegenstände, beispielsweise Packungen, aufgebracht wird, die an dem Schreibkopf entlang bewegt werden. Die Tintenspritzdüsen des Schreibkopfs sind in einer Reihe dicht nebeneinander angeordnet und werden durch die jedem einzelnen Verschlußkörper zugeordneten Antriebseinrichtungen mittels einer Steuereinrichtung so betätigt, daß an dem vorbeigeführten Gegenstand die gewünschte Beschriftung entsteht.Such ink-jet writing heads are used in particular as writing heads for marking devices with which labeling is applied to objects, for example packs, which are moved along the writing head. The ink spray nozzles of the print head are arranged in a row close to one another and are actuated by the drive devices assigned to each individual closure body by means of a control device in such a way that the desired inscription is produced on the object being guided past.

Eine konstruktive Schwierigkeit derartiger Tintenstrahl-Schreibköpfe ist dadurch gegeben, daß die einzelnen Tintenspritzdüsen ausreichend nahe beieinander angeordnet sein müssen, daß aber die Antriebseinrichtungen, üblicherweise Elektromagnete, von solchen Abmessungen sind, daß sie nicht so dicht wie die Tintenspritzdüsen nebeneinander angeordnet werden können. Deshalb werden die Antriebseinrichtungen üblicherweise beiderseits der die Tintenspritzdüsen enthaltenden Ebene aufgefächert angeordnet, und ihre Antriebsbewegung wird auf die Verschlußkörper übertragen. Diese Übertragung kann durch flexible Drähte erfolgen, die jeweils einerseits mit dem Verschlußkörper und andererseits mit einem Betätigungsmagnet als Antriebseinrichtung verbunden sind (DE-A- 33 02 617). Stattdessen ist es auch bekannt, jeden Verschlußkörper mit einer Zugstange zu verbinden, die an ihrem dem Verschlußkörper abgekehrten Ende mit einer Zunge eines Ankers eines Elektromagneten verbunden ist.A constructive difficulty of such ink jet print heads is that the individual ink spray nozzles must be arranged sufficiently close to one another, but that the drive devices, usually electromagnets, are of such dimensions that they are not as dense as the ink spray nozzles can be arranged side by side. For this reason, the drive devices are usually fanned out on both sides of the plane containing the ink spray nozzles, and their drive movement is transmitted to the closure bodies. This transmission can be carried out by flexible wires, each of which is connected on the one hand to the closure body and on the other hand to an actuating magnet as the drive device (DE-A-33 02 617). Instead, it is also known to connect each closure body to a pull rod which is connected at its end remote from the closure body to a tongue of an armature of an electromagnet.

Da die Tinte in der Tintenkammer unter Überdruck steht, muß zwischen der Tintenkammer und den aus dieser herausgeführten Zugstangen bzw. Drähten eine druckdichte Abdichtung vorgesehen werden. Die in dieser Dichtung auftretende Reibung beeinträchtigt aber die Funktionssicherheit des Tintenstrahl-Schreibkopfs. Einerseits tritt ein unerwünschter Verschleiß auf; andererseits wird die notwendige, sehr rasche Bewegung der Verschlußkörper durch diese Dichtungsreibung behindert.Since the ink in the ink chamber is under overpressure, a pressure-tight seal must be provided between the ink chamber and the pull rods or wires led out of it. The friction occurring in this seal, however, impairs the functional reliability of the ink jet print head. On the one hand, undesirable wear occurs; on the other hand, the necessary, very rapid movement of the closure body is hindered by this sealing friction.

Es ist zwar bekannt (EP-A 33 717), einen flexiblen Balg zur Abdichtung zwischen einer axial bewegten Zugstange und einer die Zugstange umgebenden Betätigungsöffnung zu verwenden. Hierbei handelt es sich jedoch nicht um eine Zugstange in einem Tintenstrahl-Schreibkopf der hier betroffenen Gattung, sondern um ein Gerät zur Erzeugung von gleichmäßigen Tröpfchen, die aus einer Vielzahl von Öffnungen eines Behälters abgegeben werden.It is known (EP-A 33 717) to use a flexible bellows for sealing between an axially moving pull rod and an actuating opening surrounding the pull rod. However, this is not a pull rod in an ink jet writing head of the type concerned here, but rather a device for producing uniform droplets which are dispensed from a multiplicity of openings in a container.

Aufgabe der Erfindung ist es daher, einen Tintenstrahl-Schreibkopf der eingangs genannten Gattung so auszubilden, daß eine vollständige und wirksame Abdichtung der aus der Tintenkammer herausgeführten Zugstangen ohne Funktionsbeeinträchtigung ermöglicht wird.The object of the invention is therefore to design an inkjet write head of the type mentioned in such a way that a complete and effective sealing of the pull rods led out of the ink chamber is made possible without impairment of function.

Diese Aufgabe wird dadurch gelöst, daß die Zugstangendichtung in axialer Richtung der Zugstange verformbar und sowohl mit der Betätigungsöffnung als auch mit der Zugstange fest verbunden ist, und daß die Zugstangendichtung eine kegelstumpfförmige Dichttülle oder Dichthülse ist, die mit ihrem weiteren Ende am Rand der Betätigungsöffnung dichtend befestigt ist und mit ihrem engeren Ende die Zugstange dichtend umgreift.This object is achieved in that the pull rod seal is deformable in the axial direction of the pull rod and is firmly connected to both the actuating opening and the pull rod, and in that the pull rod seal is a truncated cone-shaped sealing sleeve or sealing sleeve which seals with its further end at the edge of the actuating opening is attached and with its narrower end sealingly engages around the pull rod.

Bei dieser Dichtung tritt keine Reibung, sondern nur eine axiale Verformung auf, so daß die Funktion des Tintenstrahl-Schreibkopfes durch die Dichtung nicht beeinträchtigt wird. Es hat sich insbesondere gezeigt, daß die für die axiale elastische Verformung der Dichtung erforderlichen Kräfte ohne Schwierigkeiten von den Antriebseinrichtungen aufgebracht werden können und daß dadurch vor allem die Betätigungsgeschwindigkeit nicht beeinträchtigt wird. Abrieb oder Dichtungsprobleme treten nicht auf, da die Dichtung sowohl mit der jeweils zugeordneten Betätigungsöffnung der Tintenkammer als auch mit der Zugstange fest und somit absolut dicht verbunden ist.With this seal there is no friction, but only an axial deformation, so that the function of the ink jet write head is not impaired by the seal. It has been shown in particular that the forces required for the axial elastic deformation of the seal can be applied without difficulty by the drive devices and that above all the operating speed is not impaired thereby. Abrasion or sealing problems do not occur, since the seal is fixed both to the respectively assigned actuating opening of the ink chamber and to the pull rod and is therefore absolutely tightly connected.

Da wegen der dicht nebeneinanderliegenden Anordnung der Tintenspritzdüsen in radialer Richtung nur verhältnismäßig wenig, in axialer Richtung aber ausreichend Platz zur Verfügung steht, kann die erfindungsgemäße Dichtung sehr schlank ausgeführt werden. Ihre radialen Abmessungen sind nicht größer als der durch den Abstand benachbarter Tintenspritzdüsen vorgegebene Abstand. Erfindungsgemäß ist die Zugstangendichtung als kegelstumpfförmige Dichthülse ausgeführt, die mit ihrem weiteren Ende am Rand der Betätigungsöffnung dichtend befestigt ist und mit ihrem engeren Ende die Schubstange dichtend umgreift. Derartige schlanke Dichthülsen können beispielsweise als Faltenbalg ausgeführt sein. Die durch diese Gestaltung gegebene hohe Verformbarkeit ermöglicht es, die Dichthülse aus Metall auszuführen.Since there is only relatively little space available in the radial direction because of the closely spaced arrangement of the ink spray nozzles, but sufficient space is available in the axial direction, the seal according to the invention can be made very slim. Their radial dimensions are no greater than the distance specified by the distance between adjacent ink spray nozzles. According to the invention, the tie rod seal is designed as a truncated cone-shaped sealing sleeve, which is fastened sealingly with its further end to the edge of the actuating opening and, with its narrower end, surrounds the push rod in a sealing manner. Such slim sealing sleeves can be designed, for example, as bellows. The high deformability provided by this design enables the sealing sleeve to be made of metal.

Stattdessen kann die Dichthülse aber auch als im wesentlichen glatter Kegelstumpf ausgebildet sein; bei dieser Ausführungsform wird z.B. elastisch verformbarer Kunststoff oder vorzugsweise Kautschuk bzw. Gummi verwendet.Instead, the sealing sleeve can also be designed as an essentially smooth truncated cone; in this embodiment e.g. elastically deformable plastic or preferably rubber or rubber used.

Nachfolgend werden Ausführungsbeispiele der Erfindung erläutert, die in der Zeichnung dargestellt sind. Es zeigt:

  • Fig. 1 einen Tintenstrahl-Schreibkopf in einem Schnitt in vereinfachter Darstellungsweise,
  • Fig. 2 einen vergrößerten Teilschnitt durch einen Tintenstrahl-Schreibkopf im Bereich einer einzelnen Tintenspritzdüse und
  • Fig. 3 einen Schnitt ähnlich der Fig. 2 bei einer abgewandelten Ausführungsform.
Exemplary embodiments of the invention are illustrated below, which are shown in the drawing. It shows:
  • 1 shows an ink jet write head in a section in a simplified representation,
  • Fig. 2 is an enlarged partial section through an ink jet write head in the area of a single ink spray nozzle and
  • Fig. 3 shows a section similar to FIG. 2 in a modified embodiment.

Der in Fig. 1 gezeigte Tintenstrahl-Schreibkopf 1 weist eine Tintenkammer 2 auf, die über eine Leitung 3 mit einer (nicht dargestellten) Tintendruckguelle, beispielsweise einer Tintenpumpe, verbunden ist. In einer Vorderwand 4 der Tintenkammer 2 sind in einer Reihe mehrere Tintenspritzdüsen 5 angeordnet. Der jeweils aus einer Tintenspritzdüse 5 austretende Tintenstrahl trifft auf einen im Abstand vor der Wand 4 entlang bewegten zu signierenden Gegenstand 6, dessen Außenfläche in Fig. 1 mit einer strichpunktierten Linie nur angedeutet ist.1 has an ink chamber 2, which is connected via a line 3 to an ink pressure source (not shown), for example an ink pump. A plurality of ink spray nozzles 5 are arranged in a row in a front wall 4 of the ink chamber 2. The ink jet emerging in each case from an ink spray nozzle 5 strikes an object 6 to be signed that is moved along at a distance from the wall 4, the outer surface of which is only indicated in FIG. 1 by a dash-dotted line.

Im Inneren der Tintenkammer 2 ist vor jeder Tintenspritzdüse 5 ein Verschlußkörper 7 angeordnet. Wenn der Verschlußkörper 7 von der zugeordneten Tintenspritzdüse 5 abgehoben wird, tritt ein Tintenstrahl aus der Tintenspritzdüse 5 aus. Zu diesem Zweck ist jeder Verschlußkörper 7 mit einer beispielsweise als Röhrchen ausgeführten Zugstange 8 verbunden, die durch eine Betätigungsöffnung 9 aus der Tintenkammer 2 herausgeführt ist und an ihrem anderen Ende mit einem bewegbaren Anker 10 eines Elektromagneten 11 verbunden ist, der die Antriebseinrichtung für den Verschlußkörper 7 bildet. Die Zugstange 8 kann auch flexibel als Draht ausgeführt sein.In the interior of the ink chamber 2, a closure body 7 is arranged in front of each ink spray nozzle 5. When the closure body 7 is lifted off the associated ink spray nozzle 5, an ink jet emerges from the ink spray nozzle 5. For this purpose, each closure body 7 is connected to a pull rod 8, for example designed as a tube, which by a Actuating opening 9 is led out of the ink chamber 2 and is connected at its other end to a movable armature 10 of an electromagnet 11, which forms the drive device for the closure body 7. The pull rod 8 can also be designed flexibly as a wire.

Zwischen jeder Betätigungsöffnung 9 und der aus dieser herausgeführten Zugstange 8 ist eine Dichtung angeordnet, die als schlanke, kegelstumpfförmige Dichttülle oder Dichthülse 12 ausgeführt ist, die mit ihrem weiteren Ende am Rand der Betätigungsöffnung 9 dichtend befestigt ist und mit ihrem engeren Ende die Zugstange 8 dichtend umgreift. Einzelheiten und Ausführungsformen dieser Dichtung sind in den Fig. 2 und 3 dargestellt.Between each actuation opening 9 and the pull rod 8 led out of this, a seal is arranged, which is designed as a slim, truncated cone-shaped sealing sleeve or sealing sleeve 12, which is fastened sealingly with its further end to the edge of the actuating opening 9 and with its narrower end the pull rod 8 sealing embraces. Details and embodiments of this seal are shown in FIGS. 2 and 3.

Bei der in Fig. 2 gezeigten Ausführung wird die Zugstange 8 in der Tintenkammer 2 in einer Führung 13 axial beweglich geführt, die aber keine Dichtung für die Tinte darstellt. Auf der der Tintenspritzdüse 5 abgekehrten Seite schließt sich an die Führung 13 ein Rohr 14 an. Das der Führung 13 zugekehrte Ende des Rohres 14 bildet die Betätigungsöffnung 9. Das Rohrende hält einen Wulst 15, der das weitere Ende der hier als glatter Kegelstumpf ausgeführten Dichthülse 12 bildet. Auf diese Weise ist die Dichthülse 12 dichtend in der Betätigungsöffnung 9 aufgenommen.In the embodiment shown in FIG. 2, the pull rod 8 is guided axially movably in the ink chamber 2 in a guide 13, but this does not constitute a seal for the ink. On the side facing away from the ink spray nozzle 5, a tube 14 connects to the guide 13. The end of the tube 14 facing the guide 13 forms the actuating opening 9. The tube end holds a bead 15 which forms the further end of the sealing sleeve 12, which is designed here as a smooth truncated cone. In this way, the sealing sleeve 12 is sealingly received in the actuation opening 9.

Die Dichthülse 12 verjüngt sich in der Richtung von der Führung 13 weg und umschließt mit ihrem engeren, rohrförmigen Ende 16 die Zugstange 8 dichtend. Die Dichthülse 12 besteht hierbei beispielsweise aus elastisch verformbaren Kunststoff oder bevorzugt aus Gummi.The sealing sleeve 12 tapers in the direction away from the guide 13 and encloses the tie rod 8 in a sealing manner with its narrower tubular end 16. The sealing sleeve 12 consists here, for example, of elastically deformable plastic or preferably of rubber.

Bei einer Schwenkbewegung des Ankers 10 der Antriebseinrichtung in Richtung des in Fig. 2 eingezeichneten Pfeiles gegen die Kraft einer Einstellfeder 17 wird die Zugstange 8 mitgenommen und der Verschlußkörper 7 wird von der Tintenspritzdüse 5 abgehoben, so daß kurzzeitig ein Tintenstrahl aus der Tintenspritzdüse 5 austreten kann. Bei dieser Bewegung wird die Dichthülse 12 in axialer Richtung elastisch verformt, ohne daß eine Dichtungsreibung auftritt.When the armature 10 of the drive device pivots in the direction of the arrow shown in FIG. 2 against the force of an adjusting spring 17, the pull rod 8 is carried along and the Closure body 7 is lifted off the ink spray nozzle 5, so that an ink jet can briefly emerge from the ink spray nozzle 5. During this movement, the sealing sleeve 12 is elastically deformed in the axial direction without sealing friction occurring.

Das in Fig. 3 dargestellte Ausführungsbeispiel unterscheidet sich von dem Ausführungsbeispiel nach Fig. 2 im dadurch, daß die im wesentlichen kegelstumpfförmige Dichthülse 12' ein metallischer Faltenbalg ist, der mit seinem weiteren Ende an dem der Tintenkammer 2 abgekehrten Ende des Rohres 14 dichtend aufgenommen ist. Dieses Ende des Rohres 14 bildet hierbei die Betätigungsöffnung 9.The embodiment shown in Fig. 3 differs from the embodiment of Fig. 2 in that the substantially frusto-conical sealing sleeve 12 'is a metallic bellows, which is received with its other end on the end facing away from the ink chamber 2 of the tube 14 sealing . This end of the tube 14 forms the actuation opening 9.

Die Dichthülse 12' verjüngt sich in Richtung zur Tintenstrahlkammer 2 und umschließt mit ihrem engeren Ende wie beschrieben die Zugstange 8. Auch bei dieser Ausführungsform erfolgt bei der axialen Betätigung der Zugstange 8 eine elastische Verformung der Dichthülse 12 in axialer Richtung der Zugstange 8 ohne jegliche Dichtungsreibung.The sealing sleeve 12 'tapers in the direction of the ink jet chamber 2 and encloses the pull rod 8 with its narrower end as described. Also in this embodiment, when the pull rod 8 is actuated axially, the sealing sleeve 12 is elastically deformed in the axial direction of the pull rod 8 without any sealing friction .

Claims (9)

  1. Ink jet writing head, in particular for marking devices, with an ink chamber (2) connected to an ink pressure source, in which several closure elements (7), each closing off an ink jet nozzle (5), are arranged, which are each connected to a tie-rod (8), which are guided in an axially movable manner out of the ink chamber (2) through respectively one actuating opening (9) and are connected to a drive device (10, 11), a tie-rod seal (12, 12') being located between each actuating opening (9) and the tie-rod (8), characterised in that the tie-rod seal (12, 12') is deformable in the axial direction of the tie-rod (8) and is securely connected both to the actuating opening (9) as well as to the tie-rod (8), and that the tie-rod seal is a frustoconical sealing lip or sealing sleeve (12, 12'), which is sealingly connected by its wider end (15) to the edge of the actuating opening (9) and by its narrower end (16) sealingly surrounds the tie-rod.
  2. Ink jet writing head according to Claim 1, characterised in that the sealing sleeve (12') is constructed as bellows.
  3. Ink jet writing head according to Claim 2, characterised in that the sealing sleeve (12') consists of metal.
  4. Ink jet writing head according to Claim 1, characterised in that the sealing sleeve (12) consists of elastically deformable synthetic material, rubber or caoutchouc and forms a substantially smooth truncated cone.
  5. Ink jet writing head according to Claim 1, characterised in that located in the ink chamber (2) is a guide (13) for each tie-rod (8) and that the sealing sleeve (12, 12') is located on the side of the guide (13) remote from the closure element (7).
  6. Ink jet writing head according to Claim 5, characterised in that the sealing sleeve (12') tapers from the actuating opening (9) in the direction towards the guide (13).
  7. Ink jet writing head according to Claim 5, characterised in that starting from the actuating opening (9), the sealing sleeve (12) tapers away from the guide (13).
  8. Ink jet writing head according to Claim 1, characterised in that the sealing sleeve (12, 12') is located in a tube (14) surrounding the tie-rod (8) concentrically at a distance therefrom and connected to the ink chamber (2).
  9. Ink jet writing head according to Claim 8, characterised in that the one end of the tube (14) is hermetically connected to the sealing sleeve (12, 12').
EP89912438A 1988-11-05 1989-10-30 Ink jet writing head Expired - Lifetime EP0445137B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89912438T ATE89221T1 (en) 1988-11-05 1989-10-30 INKJET WRITING HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837680A DE3837680A1 (en) 1988-11-05 1988-11-05 INK-JET PRINT HEAD
DE3837680 1988-11-05

Publications (2)

Publication Number Publication Date
EP0445137A1 EP0445137A1 (en) 1991-09-11
EP0445137B1 true EP0445137B1 (en) 1993-05-12

Family

ID=6366622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89912438A Expired - Lifetime EP0445137B1 (en) 1988-11-05 1989-10-30 Ink jet writing head

Country Status (3)

Country Link
EP (1) EP0445137B1 (en)
DE (2) DE3837680A1 (en)
WO (1) WO1990005066A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013013983A1 (en) 2011-07-22 2013-01-31 Durst Phototechnik - A.G. Print head for an ink jet printer
EP2716459A1 (en) 2012-10-02 2014-04-09 EBS Ink-Jet Systeme GmbH Ink jet writing head with sealing element
DE102005020248B4 (en) * 2004-10-25 2014-08-28 Rea Elektronik Gmbh Inkjet recording head
DE102005031034B4 (en) * 2005-07-02 2021-03-18 Rea Elektronik Gmbh Inkjet print head

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10065287A1 (en) * 2000-12-29 2002-07-04 Bauer Wulf Inkjet recording head
EP1720710A1 (en) 2004-03-03 2006-11-15 REA Elektronik GmbH Ink-jet printing element
WO2005110759A1 (en) 2004-05-11 2005-11-24 Rea Elektronik Gmbh Ink jet write head

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033717A1 (en) * 1980-01-30 1981-08-12 Battelle Development Corporation Process for breaking a jet into a plurality of droplets of determined size and device for carrying out this process
DE3302617A1 (en) * 1983-01-27 1984-08-02 Cyklop International Emil Hoffmann KG, 5000 Köln COLOR SPRAY HEAD

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020248B4 (en) * 2004-10-25 2014-08-28 Rea Elektronik Gmbh Inkjet recording head
DE102005031034B4 (en) * 2005-07-02 2021-03-18 Rea Elektronik Gmbh Inkjet print head
WO2013013983A1 (en) 2011-07-22 2013-01-31 Durst Phototechnik - A.G. Print head for an ink jet printer
US9751313B2 (en) 2011-07-22 2017-09-05 Durst Phototechnik—A.G. Print head for an ink jet printer
US9994029B2 (en) 2011-07-22 2018-06-12 Durst Phototechnik—A.G. Print head for an ink jet printer
EP2716459A1 (en) 2012-10-02 2014-04-09 EBS Ink-Jet Systeme GmbH Ink jet writing head with sealing element

Also Published As

Publication number Publication date
EP0445137A1 (en) 1991-09-11
DE58904370D1 (en) 1993-06-17
WO1990005066A1 (en) 1990-05-17
DE3837680A1 (en) 1990-05-10

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