EP0288027B1 - Ink jet print head - Google Patents

Ink jet print head Download PDF

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Publication number
EP0288027B1
EP0288027B1 EP88106295A EP88106295A EP0288027B1 EP 0288027 B1 EP0288027 B1 EP 0288027B1 EP 88106295 A EP88106295 A EP 88106295A EP 88106295 A EP88106295 A EP 88106295A EP 0288027 B1 EP0288027 B1 EP 0288027B1
Authority
EP
European Patent Office
Prior art keywords
jet
nozzle
ink jet
nozzle axis
collecting tube
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
EP88106295A
Other languages
German (de)
French (fr)
Other versions
EP0288027A1 (en
Inventor
Gerhard Gloeckler
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.)
Codi-Jet Markierungs Systeme GmbH
Original Assignee
Codi-Jet Markierungs Systeme GmbH
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 Codi-Jet Markierungs Systeme GmbH filed Critical Codi-Jet Markierungs Systeme GmbH
Priority to AT88106295T priority Critical patent/ATE65965T1/en
Publication of EP0288027A1 publication Critical patent/EP0288027A1/en
Application granted granted Critical
Publication of EP0288027B1 publication Critical patent/EP0288027B1/en
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
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers
    • 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
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16505—Caps, spittoons or covers for cleaning or preventing drying out
    • 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
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers
    • B41J2002/1853—Ink-collectors; Ink-catchers ink collectors for continuous Inkjet printers, e.g. gutters, mist suction means

Definitions

  • the invention relates to a continuously operating ink jet write head with a jet generator, a jet deflection unit and a catch tube arranged in the nozzle axis for receiving the undeflected ink jet, the catch tube being fastened on a carrier which is guided parallel to the nozzle axis and can be moved by a drive to be movable along the nozzle axis between its working position and a rest position in which it tightly encloses the mouth region of the jet nozzle, and at least parts of the jet deflection unit being movably mounted transversely to the nozzle axis.
  • Such a device is known for example from US-A-4,160,982.
  • the device shown there has the particular disadvantage that failure to remove the beam deflection unit from the linear movement of the collecting tube leads to damage to one part or the other.
  • catch tube or its slide is moved here by means of a toothed rack, which experience has shown requires a large overall length of the entire device.
  • the aim of the present invention is to increase the availability of the device by automatically stopping and starting up the write head and to avoid tedious and lengthy cleaning manipulations.
  • the device should be as small as possible and foolproof.
  • these parts of the beam deflection unit are positively coupled to the movable carrier in order to keep the trajectory of the collecting tube and / or the carrier clear.
  • This positive coupling has the great advantage that the deflection unit is always removed from the trajectory of the collecting tube when this is necessary, i. H. when the trajectory crosses the position of the beam deflection unit.
  • a very simple exemplary embodiment provides a push crank with which the beam deflection unit and the movable carrier are coupled. This simple mechanical design is absolutely foolproof and less prone to wear.
  • the slide movement is preferably generated by means of a threaded spindle.
  • annular seal is provided at the mouth area of the jet nozzle, which in turn serves to achieve a leak-proof collecting tube connection.
  • the illustrated inkjet write head has a base plate 1 with a jet generator 2 of a known type mounted thereon. This is assigned a jet nozzle 3, which is integrated in a nozzle plate 5. This nozzle plate 5 is adjustable on the base plate 1 in order to align the jet nozzle 3 in a manner not shown. As indicated schematically by the direction of the arrow x in FIG. 1, writing ink is fed to the jet generator 2 and a continuous writing jet 7 is generated, which is broken down into fine droplets in a known manner. If the jet 7 is not deflected on its flight, it runs in the direction of the nozzle axis 4.
  • a deflection unit 10 for the ink jet 7 is mounted on a swivel plate 11, which is connected to the base plate 1 via a hinge axis 12.
  • the deflection unit contains a charging electrode 13 and a pair of plate-shaped deflection plates 16, which are each held by a base 15.
  • the ink jet 7 experiences a defined electrostatic charge in a narrow slot 14 (FIG. 2) of the charging electrode 13, and in the space between the baffle plates 16 it is charged in the direction of the plate distance (perpendicular to the plane of the drawing in FIG . 1) deflected.
  • the deflection unit 10 (seen from the jet nozzle 3) there is a catch tube 20 for the undeflected ink jet 7.
  • the ink jet 7 On its open mouth 20 refinement the ink jet 7 is aligned so that the undeflected jet is received by the catch tube 20 and via an ink -Return 20 ⁇ is returned to the device.
  • the ink jet 7 only reaches the object (not shown) to be labeled when it is deflected between the plates 16.
  • a carrier or slide 21 serves as a carrier for the collecting tube 20, which carrier is guided on two parallel rods 22, 22 'connected by a yoke 23.
  • the two rods 22, 22 ⁇ start from the base plate 1 or a flange 26 connected to it, that is, they are fixed with respect to the jet nozzle 3.
  • With the carriage 21 is also a threaded spindle 24 in engagement, which extends between the two rods 22, 22 ⁇ and can be driven by an electric motor 25 in both directions of rotation; the motor 25 is also fastened to the base plate 1 with the aid of the flange 26.
  • the carriage 21 with the collecting tube 20 can thus be moved back and forth between two end positions parallel to the nozzle axis 4.
  • One of these end positions corresponds to the working position according to FIG. 1, while the other end position - the rest position when the writing instrument is switched off - is shown in FIG. 4.
  • the catch tube 20 engages in a plate 6 in order to tightly enclose the mouth region of the jet nozzle 3 (without, however, blocking the nozzle bore itself).
  • an O-ring seal 6platte is arranged between the plate 6 and the nozzle plate 5, which seal 6 ⁇ surrounds the nozzle axis 4 and is matched to the diameter of the collecting tube 20.
  • the deflection unit 10 Since the deflection unit 10 as a whole can be swiveled out about the axis 12, it is movably mounted transversely to the nozzle axis 4.
  • the transverse movement of the deflection unit 10 is expediently coupled to the travel movement of the slide 21, here by means of a push crank 28, which on the one hand by means of bolts 27, 29 with the slide 21 mentioned and on the other hand is articulated to one of the bases 15.
  • the deflection unit 10 is automatically pivoted out in accordance with the travel movements of the carriage 21 (see rest position according to FIG. 4), so that a collision is impossible.
  • the charging electrode could be composed of two halves, which can be moved apart to expand the slot to expand the passage to enable the catch tube.
  • other types of forced coupling or coordinated movement of the parts are of course conceivable, for example by means of cams or the like.
  • the motor 25 is switched on with the switch-off command and the collecting tube 20 is moved towards the nozzle.
  • the jet generator and the ink return are still kept in operation during the travel movement and thus the jet 7 is continuously taken up by the collecting tube 20, so that the system does not dry out undesirably.
  • Only after reaching the rest position according to FIG. 4 are the motor 25 and the ink system switched off. Since the system is now tightly sealed between the nozzle and the collecting tube, ink can neither leak nor dry out.
  • the jet generator and then the motor 25 are switched on in order to bring the write head into the operating position according to FIG. 1 if the ink jet already exists.

Abstract

In a continuously operating ink jet print head with a jet producer (2), a jet deflector unit (10) and a receiver tube (20), arranged in the nozzle axis (4), for receiving the undeflected ink jet, the receiver tube (20) is to be attached to a support (21) guided parallel to the nozzle axis (4) and capable of being moved by means of a drive (24, 25) so as to be traversable along the nozzle axis (4) between a working position and a resting position, in which it tightly encloses the mouth region of the jet nozzle (3). In this respect, at least parts of the jet deflector unit (10) are mounted so as to be able to move across the nozzle axis (4). These parts of the jet deflector unit (10) are now to be forcibly coupled to the movable support (21) in order to keep free the movement track of the receiver tube (20) and/or of the support (21). <IMAGE>

Description

Die Erfindung betrifft einen kontinuierlich arbeitenden Tintenstrahl-Schreibkopf mit einem Strahlerzeuger, einer Strahl-Ablenkeinheit und einem in der Düsenachse angeordneten Fangrohr zur Aufnahme des nicht abgelenkten Tintenstrahls, wobei das Fangrohr auf einem parallel zur Düsenachse geführten, mittels eines Antriebes verfahrbaren Träger befestigt ist, um entlang der Düsenachse zwischen seiner Arbeitslage und einer Ruhelage bewegbar zu sein, in welcher es den Mündungsbereich der Strahldüse dicht umschließt, und wobei mindestens Teile der Strahl-Ablenkeinheit quer zur Düsenachse beweglich gelagert sind.The invention relates to a continuously operating ink jet write head with a jet generator, a jet deflection unit and a catch tube arranged in the nozzle axis for receiving the undeflected ink jet, the catch tube being fastened on a carrier which is guided parallel to the nozzle axis and can be moved by a drive to be movable along the nozzle axis between its working position and a rest position in which it tightly encloses the mouth region of the jet nozzle, and at least parts of the jet deflection unit being movably mounted transversely to the nozzle axis.

Solche kontinuierlich betriebenen Schreibköpfe - bei denen also während den normalen, kurzzeitigen Schreibunterbrüchen zwischen Zeichen, bei unterbrochenen Linien usw. die Strahlerzeugung nicht unterbrochen, sondern der nicht abgelenkte Tintenstrahl auf ein Fangrohr trifft - werden vorwiegend mit ultraschnell trocknenden Tinten verwendet, weil mit solchen ein ständig abwechselndes Anfahren und Stoppen des Strahls mit besonderen Schwierigkeiten verbunden wäre. Hierbei ergeben sich jedoch Probleme bei der Stillsetzung und Inbetriebnahme des Schreibgerätes, indem Düse und Fangrohr samt Rücklaufleitung zum Eintrocknen neigen und jeweils manuelle Operationen mit Verwendung von Lösungsmitteln erforderlich sind, um das Gerät wieder verfügbar zu machen.Such continuously operated print heads - in which the jet generation does not interrupt during normal, brief write interruptions between characters, broken lines etc., but the undeflected ink jet hits a collecting tube - are mainly used with ultrafast drying inks, because with them a constantly alternately starting and stopping the jet would be associated with particular difficulties. However, this poses problems when the writing instrument is shut down and put into operation, since the nozzle and collecting tube together with the return line tend to dry out and manual operations with the use of solvents are required to make the instrument available again.

Eine derartige Einrichtung ist beispielsweise aus der US-A-4,160,982 bekannt. Allerdings hat die dort gezeigte Vorrichtung vor allem den Nachteil, daß bei Versäumung der Entfernung der Strahl-Ablenkeinheit aus der Linearbewegung des Fangrohres es zu Beschädigungen des einen oder anderen Teils kommt.Such a device is known for example from US-A-4,160,982. However, the device shown there has the particular disadvantage that failure to remove the beam deflection unit from the linear movement of the collecting tube leads to damage to one part or the other.

Ferner wird hier das Fangrohr bzw. dessen Schlitten mittels einer Zahnstange bewegt, die erfahrungsgemäß eine große Baulänge der gesamten Vorrichtung benötigt.Furthermore, the catch tube or its slide is moved here by means of a toothed rack, which experience has shown requires a large overall length of the entire device.

Mit der vorliegenden Erfindung wird angestrebt, durch automatisierte Stillsetzung und Inbetriebnahme des Schreibkopfes die Verfügbarkeit des Gerätes zu erhöhen sowie lästige und langwierige Reinigungsmanipulationen zu vermeiden. Dabei soll das Gerät möglichst klein gebaut und narrensicher sein.The aim of the present invention is to increase the availability of the device by automatically stopping and starting up the write head and to avoid tedious and lengthy cleaning manipulations. The device should be as small as possible and foolproof.

Zur Lösung dieser Aufgabe führt, daß diese Teile der Strahl-Ablenkeinheit mit dem verfahrbaren Träger zwangsgekoppelt sind, um die Bewegungsbahn des Fangrohres und/oder des Trägers freizuhalten.To achieve this object, these parts of the beam deflection unit are positively coupled to the movable carrier in order to keep the trajectory of the collecting tube and / or the carrier clear.

Diese Zwangskopplung hat den großen Vorteil, daß die Ablenkeinheit immer dann aus der Bewegungsbahn des Fangrohres entfernt wird, wenn dies erforderlich ist, d. h. wenn die Bewegungsbahn die Lage der Strahl-Ablenkeinheit kreuzt.This positive coupling has the great advantage that the deflection unit is always removed from the trajectory of the collecting tube when this is necessary, i. H. when the trajectory crosses the position of the beam deflection unit.

Ein sehr einfaches Ausführungsbeispiel sieht eine Schubkurbel vor, mit der die Strahl-Ablenkeinheit und der verfahrbare Träger gekoppelt sind. Diese einfache mechanische Ausgestaltung ist absolut narrensicher und wenig verschleißanfällig.A very simple exemplary embodiment provides a push crank with which the beam deflection unit and the movable carrier are coupled. This simple mechanical design is absolutely foolproof and less prone to wear.

Um die Baueinheit des gesamten Gerätes klein zu halten, wird bevorzugt die Schlittenbewegung mittels einer Gewindespindel erzeugt.In order to keep the structural unit of the entire device small, the slide movement is preferably generated by means of a threaded spindle.

Ferner ist am Mündungsbereich der Strahldüse eine Ringdichtung vorgesehen, welche wiederum der Erzielung eines dichten Fangrohr-Anschlusses dient.Furthermore, an annular seal is provided at the mouth area of the jet nozzle, which in turn serves to achieve a leak-proof collecting tube connection.

Nachstehend wird ein Ausführungsbeispiel eines erfindungsgemäßen Tintenstrahl-Schreibkopfes in Verbindung mit der Zeichnung näher beschrieben. Es zeigen:

Fig. 1
eine Seitenansicht des Schreibkopfes in Betriebsstellung;
Fig. 2
die Stirnansicht des Schreibkopfes von der Seite A (Fig. 1);
Fig. 3
einen Schnitt entlang Linie III-III in Fig. 1;
Fig. 4
eine Seitenansicht ähnlich derjenigen nach Fig. 1, jedoch in der Ruhestellung, d. h. bei abgeschaltetem Schreibgerät.
An exemplary embodiment of an ink jet write head according to the invention is described in more detail below in conjunction with the drawing. Show it:
Fig. 1
a side view of the print head in the operating position;
Fig. 2
the front view of the print head from side A (Fig. 1);
Fig. 3
a section along line III-III in Fig. 1;
Fig. 4
a side view similar to that of FIG. 1, but in the rest position, ie when the writing instrument is switched off.

Der dargestellte Tintenstrahl-Schreibkopf weist eine Grundplatte 1 mit daran montiertem Strahlerzeuger 2 von ansich bekannter Bauart auf. Diesem ist eine Strahldüse 3 zugeordnet, welche in einer Düsenplatte 5 integriert ist. Diese Düsenplatte 5 ist zwecks Ausrichtung der Strahldüse 3 in nicht näher dargestellter Weise einstellbar auf der Grundplatte 1 gehalten. Wie mit Pfeilrichtung x in Fig. 1 schematisch angedeutet, wird dem Strahlerzeuger 2 Schreibtinte zugeleitet und ein kontinuierlicher Schreibstrahl 7 erzeugt, welcher in bekannter Weise in feine Tröpfchen zerlegt wird. Sofern der Strahl 7 auf seinem Flug nicht abgelenkt wird, verläuft er in Richtung der Düsenachse 4.The illustrated inkjet write head has a base plate 1 with a jet generator 2 of a known type mounted thereon. This is assigned a jet nozzle 3, which is integrated in a nozzle plate 5. This nozzle plate 5 is adjustable on the base plate 1 in order to align the jet nozzle 3 in a manner not shown. As indicated schematically by the direction of the arrow x in FIG. 1, writing ink is fed to the jet generator 2 and a continuous writing jet 7 is generated, which is broken down into fine droplets in a known manner. If the jet 7 is not deflected on its flight, it runs in the direction of the nozzle axis 4.

Eine Ablenkeinheit 10 für den Tintenstrahl 7 ist auf einer Schwenkplatte 11 montiert, die über eine Scharnierachse 12 mit der Grundplatte 1 verbunden ist. In ansich bekannter Weise enthält die Ablenkeinheit eine Ladeelektrode 13 sowie ein Paar von tellerförmigen Ablenkplatten 16, die je von einem Sockel 15 gehalten sind.A deflection unit 10 for the ink jet 7 is mounted on a swivel plate 11, which is connected to the base plate 1 via a hinge axis 12. In a manner known per se, the deflection unit contains a charging electrode 13 and a pair of plate-shaped deflection plates 16, which are each held by a base 15.

Ausgehend von der Strahldüse 3, erfährt der Tintenstrahl 7 in einem schmalen Schlitz 14 (Fig. 2) der Ladeelektrode 13 eine definierte elektrostatische Aufladung, und im Zwischenraum zwischen den Ablenkplatten 16 wird er entsprechend der Aufladung in Richtung des Plattenabstandes (senkrecht zur Zeichenebene in Fig. 1) ausgelenkt.Starting from the jet nozzle 3, the ink jet 7 experiences a defined electrostatic charge in a narrow slot 14 (FIG. 2) of the charging electrode 13, and in the space between the baffle plates 16 it is charged in the direction of the plate distance (perpendicular to the plane of the drawing in FIG . 1) deflected.

Jenseits der Ablenkeinheit 10 (von der Strahldüse 3 her gesehen) befindet sich ein Fangrohr 20 für den nicht abgelenkten Tintenstrahl 7. Auf dessen offene Mündung 20ʹ ist der Tintenstrahl 7 ausgerichtet, so daß der nicht abgelenkte Strahl vom Fangrohr 20 aufgenommen wird und über einen Tinten-Rücklauf 20ʺ in das Gerät zurückgeleitet wird. Nur bei Auslenkung zwischen den Platten 16 gelangt der Tintenstrahl 7 auf das (nicht dargestellte) zu beschriftende Objekt.Beyond the deflection unit 10 (seen from the jet nozzle 3) there is a catch tube 20 for the undeflected ink jet 7. On its open mouth 20 ausgerichtet the ink jet 7 is aligned so that the undeflected jet is received by the catch tube 20 and via an ink -Return 20ʺ is returned to the device. The ink jet 7 only reaches the object (not shown) to be labeled when it is deflected between the plates 16.

Als Träger für das Fangrohr 20 dient ein Träger oder Schlitten 21, welcher an zwei parallelen, durch ein Joch 23 verbundenen Stangen 22, 22ʹ verfahrbar geführt ist. Die beiden Stangen 22, 22ʹ gehen von der Grundplatte 1 bzw. einem mit dieser verbundenen Flansch 26 aus, stehen also bezüglich der Strahldüse 3 fest. Mit dem Schlitten 21 steht ferner eine Gewindespindel 24 in Eingriff, welche zwischen den beiden Stangen 22, 22ʹ verläuft und von einem Elektromotor 25 in beiden Drehrichtungen antreibbar ist; der Motor 25 ist mit Hilfe des Flansches 26 ebenfalls auf der Grundplatte 1 befestigt.A carrier or slide 21 serves as a carrier for the collecting tube 20, which carrier is guided on two parallel rods 22, 22 'connected by a yoke 23. The two rods 22, 22ʹ start from the base plate 1 or a flange 26 connected to it, that is, they are fixed with respect to the jet nozzle 3. With the carriage 21 is also a threaded spindle 24 in engagement, which extends between the two rods 22, 22ʹ and can be driven by an electric motor 25 in both directions of rotation; the motor 25 is also fastened to the base plate 1 with the aid of the flange 26.

Mit Hilfe des Motors 25 und der Spindel 24 ist somit der Schlitten 21 mit dem Fangrohr 20 parallel zur Düsenachse 4 zwischen zwei Endlagen hin und her bewegbar. Die eine dieser Endlagen entspricht der Arbeitslage nach Fig. 1, während die andere Endlage - die Ruhelage bei abgeschaltetem Schreibgerät - in Fig. 4 dargestellt ist.With the aid of the motor 25 and the spindle 24, the carriage 21 with the collecting tube 20 can thus be moved back and forth between two end positions parallel to the nozzle axis 4. One of these end positions corresponds to the working position according to FIG. 1, while the other end position - the rest position when the writing instrument is switched off - is shown in FIG. 4.

Wie ersichtlich, greift dabei das Fangrohr 20 in eine Platte 6 ein, um den Mündungsbereich der Strahldüse 3 dicht zu umschließen (ohne indessen die Düsenbohrung selbst zu sperren). Zur Erzielung eines dichten Verschlusses ist zwischen der Platte 6 und der Düsenplatte 5 eine O-Ring-Dichtung 6ʹ angeordnet, welche Dichtung 6ʹ die Düsenachse 4 umgibt und auf den Durchmesser des Fangrohres 20 abgestimmt ist.As can be seen, the catch tube 20 engages in a plate 6 in order to tightly enclose the mouth region of the jet nozzle 3 (without, however, blocking the nozzle bore itself). To achieve a tight seal, an O-ring seal 6platte is arranged between the plate 6 and the nozzle plate 5, which seal 6ʹ surrounds the nozzle axis 4 and is matched to the diameter of the collecting tube 20.

Indem die Ablenkeinheit 10 als Ganzes um die Achse 12 ausgeschwenkt werden kann, ist sie quer zur Düsenachse 4 beweglich gelagert. Um beim Verfahren des Fangrohres 20 mit dem Schlitten 21 die Bewegungsbahn automatisch frei zu halten, ist zweckmäßigerweise die Querbewegung der Ablenkeinheit 10 mit der Fahrbewegung des Schlittens 21 zwangsgekoppelt, hier mittels einer Schubkurbel 28, welche mittels Bolzen 27, 29 einerseits mit dem genannten Schlitten 21 und andererseits mit einem der Sockel 15 gelenkig verbunden ist. Durch diese Anordnung wird die Ablenkeinheit 10 selbsttätig entsprechend den Fahrbewegungen des Schlittens 21 ausgeschwenkt (siehe Ruhelage nach Fig. 4), so daß eine Kollision ausgeschlossen ist.Since the deflection unit 10 as a whole can be swiveled out about the axis 12, it is movably mounted transversely to the nozzle axis 4. In order to automatically keep the path of movement free when moving the collecting tube 20 with the slide 21, the transverse movement of the deflection unit 10 is expediently coupled to the travel movement of the slide 21, here by means of a push crank 28, which on the one hand by means of bolts 27, 29 with the slide 21 mentioned and on the other hand is articulated to one of the bases 15. With this arrangement, the deflection unit 10 is automatically pivoted out in accordance with the travel movements of the carriage 21 (see rest position according to FIG. 4), so that a collision is impossible.

Bei anderer Gestaltung der Ablenkeinheit und/oder des Fangrohres und seines Trägers wäre es auch denkbar, nur Teile der Ablenkeinheit quer zur Düsenachse zu bewegen, beispielsweise könnte die Ladeelektrode aus zwei Hälften zusammengesetzt sein, welche zur Erweiterung des Schlitzes auseinanderbewegt werden können, um den Durchgang des Fangrohres zu ermöglichen. Ferner sind selbstverständlich andere Arten von Zwangskopplung bzw. koordinierter Bewegung der Teile denkbar, beispielsweise mittels Kurvenscheiben od. dgl..With a different design of the deflection unit and / or the collecting tube and its carrier, it would also be conceivable to move only parts of the deflection unit transversely to the nozzle axis, for example the charging electrode could be composed of two halves, which can be moved apart to expand the slot to expand the passage to enable the catch tube. Furthermore, other types of forced coupling or coordinated movement of the parts are of course conceivable, for example by means of cams or the like.

Soll das Gerät aus dem Betrieb (Stellung des Schreibkopfes nach Fig. 1) stillgesetzt werden, so wird mit dem Abschaltbefehl der Motor 25 eingeschaltet und das Fangrohr 20 zur Düse hin gefahren. Zweckmäßigerweise werden während der Fahrbewegung der Strahlerzeuger und der Tintenrücklauf noch in Betrieb gehalten und somit der Strahl 7 laufend vom Fangrohr 20 aufgenommen, so daß ein unerwünschtes Eintrocknen des Systems unterbleibt. Erst nach Erreichen der Ruhelage nach Fig. 4 werden der Motor 25 und das Tintensystem abgeschaltet. Da das System nun zwischen Düse und Fangrohr dicht verschlossen ist, kann weder Tinte auslaufen noch eintrocknen. Umgekehrt wird bei Inbetriebsetzung des Gerätes zunächst der Strahlerzeuger und anschließend der Motor 25 eingeschaltet, um bei bereits bestehendem Tintenstrahl den Schreibkopf in die Betriebslage nach Fig. 1 zu bringen.If the device is to be stopped from operation (position of the write head according to FIG. 1), the motor 25 is switched on with the switch-off command and the collecting tube 20 is moved towards the nozzle. Expediently, the jet generator and the ink return are still kept in operation during the travel movement and thus the jet 7 is continuously taken up by the collecting tube 20, so that the system does not dry out undesirably. Only after reaching the rest position according to FIG. 4 are the motor 25 and the ink system switched off. Since the system is now tightly sealed between the nozzle and the collecting tube, ink can neither leak nor dry out. Conversely, when the device is started up, first the jet generator and then the motor 25 are switched on in order to bring the write head into the operating position according to FIG. 1 if the ink jet already exists.

Claims (4)

  1. Continuously operating ink jet print head with a jet producer (2), a jet deflecting unit (10) and a collecting tube (20) arranged in the nozzle axis (4) for receiving the undeflected ink jet, the collecting tube (20) being fastened on a carrier (21) which is guided in parallel with the nozzle axis (4) and can be made to travel by a drive (24, 25) so as to be movable along the nozzle axis (4) between its operating position and a rest position in which it tightly surrounds the mouth region of the jet nozzle (3) and at least parts of the jet deflecting unit (10) being movably mounted transversely to the nozzle axis (4), characterised in that these parts of the jet deflecting unit (10) are forcibly coupled to the travelling carrier (21) in order to keep clear the path of movement of the collecting tube (20) and/or of the carrier (21).
  2. Ink jet print head according to claim 1, characterised in that the jet deflecting unit (10) is coupled to the travelling carrier (21) via a thrust crank (28).
  3. Ink jet print head according to claim 1 or 2, characterised in that the carrier (21) of the collecting tube (20) is a carriage which is guided on rods (22, 22') fixed with respect to the jet nozzle (3) and engages with a motor-drivable threaded spindle (24).
  4. Ink jet print head according to one of claims 1 to 3, characterised in that the mouth region of the jet nozzle (3) has an annular seal (6) which surrounds the nozzle axis (4) and is adapted to the diameter of the collecting tube.
EP88106295A 1987-04-24 1988-04-20 Ink jet print head Expired - Lifetime EP0288027B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88106295T ATE65965T1 (en) 1987-04-24 1988-04-20 INKJET WRITING HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH158487 1987-04-24
CH1584/87 1987-04-24

Publications (2)

Publication Number Publication Date
EP0288027A1 EP0288027A1 (en) 1988-10-26
EP0288027B1 true EP0288027B1 (en) 1991-08-07

Family

ID=4213827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106295A Expired - Lifetime EP0288027B1 (en) 1987-04-24 1988-04-20 Ink jet print head

Country Status (3)

Country Link
EP (1) EP0288027B1 (en)
AT (1) ATE65965T1 (en)
DE (1) DE3864061D1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839721A (en) * 1973-06-27 1974-10-01 Ibm Device for retention of ink jet nozzle clogging and ink spraying
US4160982A (en) * 1978-03-24 1979-07-10 A. B. Dick Company Anti-dispersion accumulator for ink jet printing system
US4626869A (en) * 1985-04-12 1986-12-02 Eastman Kodak Company Ink jet wet-storage system

Also Published As

Publication number Publication date
ATE65965T1 (en) 1991-08-15
DE3864061D1 (en) 1991-09-12
EP0288027A1 (en) 1988-10-26

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