EP0087759B1 - Capping and cleaning device for ink jet print heads - Google Patents

Capping and cleaning device for ink jet print heads Download PDF

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Publication number
EP0087759B1
EP0087759B1 EP83101787A EP83101787A EP0087759B1 EP 0087759 B1 EP0087759 B1 EP 0087759B1 EP 83101787 A EP83101787 A EP 83101787A EP 83101787 A EP83101787 A EP 83101787A EP 0087759 B1 EP0087759 B1 EP 0087759B1
Authority
EP
European Patent Office
Prior art keywords
sealing plate
nozzle plate
plate
print head
outlet openings
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
EP83101787A
Other languages
German (de)
French (fr)
Other versions
EP0087759A3 (en
EP0087759A2 (en
Inventor
Wilhelm Kirner
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 EP0087759A2 publication Critical patent/EP0087759A2/en
Publication of EP0087759A3 publication Critical patent/EP0087759A3/en
Application granted granted Critical
Publication of EP0087759B1 publication Critical patent/EP0087759B1/en
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
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16535—Cleaning of print head nozzles using wiping constructions

Definitions

  • the invention relates to a device according to the preamble of patent claim 1.
  • EP-A-0 041706 such a protection and cleaning device for write heads in ink writing devices is known, in which a cover cap with a cover pad attached to it and a stripping element can be pivoted at a distance in front of the nozzle plate of the write head via an electrically controllable device. If the cover cushion is in front of the nozzle plate, the outlet openings are protected against contamination. The wiping element resiliently abutting the nozzle plate also cleans the outlet openings during a swiveling process.
  • This device which is structurally connected to the write head, also enables the cover cap with cover cushion and stripping element to be actuated independently of the position of the write head, but can be used in the operating state in which the cover cap is arranged with a cutout at a distance in front of the outlet openings , then fine dust is generated between the cover cap and the nozzle plate, which comes from the cover cushion lying above the nozzle plate in this operating position and the stripping element and leads to blockage of the nozzles.
  • the object of the invention is to provide a device which not only ensures an independent of the position of the carriage safe and reliable closure of the outlet openings, but at the same time allows to eliminate exterior with a simple structure ° impurities of the outlet openings.
  • the sealing plate and the nozzle plate are fastened together on the write head, with an almost absolute security against leakage of ink being ensured by means of a sealing ring. Furthermore, it is an advantage that the cover element, which can be pivoted as a sealing plate on the nozzle plate and has a cutout, also covers most of the nozzle plate even when the outlet openings are released, and additional cleaning can thus be omitted. It is also an advantage that the sharp edges of the cutout in the sealing plate represent a very effective cleaning element for the outlet openings of the nozzle plate, since when the sealing plate and thus also the cutout are pivoted, external impurities are reliably removed.
  • an embodiment of the invention provides that the sealing plate is rotatably mounted and can be pivoted in a simple manner via a crank mechanism. This is associated with a simple structure which has only an insignificant effect on the overall structure of the write head.
  • the sealing plate can be covered with a film, e.g. B. be coated with a Teflon film, which allows a smooth movement with very high wear resistance. This in turn has a favorable effect on the dimensioning of the drive element.
  • the print head shown in FIG. 1 consists of a plastic body 1, in which the ink channels 3 run between a supply part 2 and the boundary surface of the write head facing a recording medium (not shown here).
  • the write head is closed with a nozzle plate 4, through the outlet openings 5 of which ink droplets are ejected in the direction of the recording medium.
  • the drive elements for the ink channels 3 and thus for the ejection of ink droplets are, for example, piezo elements. These are located inside the print head and are not visible in this representation.
  • the nozzle plate 4 is surrounded by a sealing ring 6.
  • the sealing plate 7 is provided, which is coated on its side facing the print head with a film, for example with a Teflon film 8.
  • the sealing plate 7 is fastened to the write head 1 together with the nozzle plate 4 by means of a resilient bracket 9.
  • a resilient bracket 9 For this purpose, two lugs 10 and 11 are provided on the write head 1, in which the bracket 9 engages. It is held by means of a tension spring 12.
  • the sealing ring is deformed by the pressing force of the bracket 9, so that an exact contact of the nozzle plate 4 on the boundary or mouth surface of the print head and thus a very secure seal is ensured.
  • the sealing plate 7 is rotatably mounted on a pin 13 which is also attached to the writing head.
  • FIG. 2 shows the write head from the front.
  • the sealing plate 7 In front of the nozzle plate 4, the sealing plate 7 is pivotally mounted about the pin 13 such that the cutout 14 of the sealing plate 7 either closes the outlet openings of the nozzle plate 7 (position shown in FIG. 2) or releases it.
  • the dimensions of the sealing plate 7 are such that it covers the nozzle plate both in the open position (outlet openings released) and in the closed position (outlet openings closed).
  • the sealing surface of the sealing plate 7 is thus covered in any case, so that no additional cleaning of the sealing plate is required.
  • the pivoting takes place via a crank mechanism 17, the crank pin 15 of which engages in a slot-shaped recess 16 of the sealing plate 7.
  • the cure Bel Mechanism 17 is moved back and forth between two stops 18 and 19 by means of a drive element, not shown here, whereby the sealing plate 7 with the cutout 14 moves on the nozzle plate 4, and closes or releases the outlet openings.
  • This arrangement enables the sealing plate 7 to move independently of the position of the writing head, ie the sealing plate 7 and the drive mechanism 15, 17, 18 and 19 are directly associated with the writing head.
  • the cutout 14 is made sharp-edged, a wiping function is carried out with each pivoting movement of the sealing plate and thus with each pivoting movement of the cutout 14, with which the outlet openings of the nozzle plate are reliably protected from external contaminants such as dust particles, residual ink, etc. getting cleaned.
  • the sealing plate 7 has only a very small thickness, so that the distance between z. B. a platen and the print head is only slightly reduced.

Description

Die Erfindung betrifft eine Vorrichtung gemäss dem Oberbegriff des Patentanspruches 1.The invention relates to a device according to the preamble of patent claim 1.

Aus der EP-A-0 041706 ist eine derartige Schutz- und Reinigungsvorrichtung für Schreibköpfe in Tintenschreibeinrichtungen bekannt, bei der über eine elektrisch ansteuerbare Vorrichtung eine Abdeckkappe mit einem daran befestigten Abdeckkissen und einem Abstreifelement im Abstand vor der Düsenplatte des Schreibkopfes verschwenkbar ist. Befindet sich das Abdeckkissen vor der Düsenplatte, so werden die Austrittsöffnungen zwar vor Verunreinigungen geschützt. Das federnd an die Düsenplatte anliegende Abstreifelement reinigt während eines Schwenkvorganges auch die Austrittsöffnungen. Diese Vorrichtung, die konstruktiv mit dem Schreibkopf verbunden ist, ermöglicht auch, dass die Abdeckkappe mit Abdeckkissen und Abstreifelement unabhängig von der Stellung des Schreibkopfes betätigt werden können, doch kann im Betriebszustand, in welchem die Abdeckkappe mit einem Ausschnitt im Abstand vor den Austrittsöffnungen angeordnet ist, dann zwischen der Abdeckkappe und der Düsenplatte feiner Staub entstehen, der von dem in dieser Betriebsstellung oberhalb der Düsenplatte liegenden Abdeckkissen und dem Abstreifelement stammt und zur Verstopfung der Düsen führt.From EP-A-0 041706 such a protection and cleaning device for write heads in ink writing devices is known, in which a cover cap with a cover pad attached to it and a stripping element can be pivoted at a distance in front of the nozzle plate of the write head via an electrically controllable device. If the cover cushion is in front of the nozzle plate, the outlet openings are protected against contamination. The wiping element resiliently abutting the nozzle plate also cleans the outlet openings during a swiveling process. This device, which is structurally connected to the write head, also enables the cover cap with cover cushion and stripping element to be actuated independently of the position of the write head, but can be used in the operating state in which the cover cap is arranged with a cutout at a distance in front of the outlet openings , then fine dust is generated between the cover cap and the nozzle plate, which comes from the cover cushion lying above the nozzle plate in this operating position and the stripping element and leads to blockage of the nozzles.

Die Aufgabe der Erfindung besteht darin, eine Vorrichtung zu schaffen, die nicht nur einen von der Stellung des Schreibwagens unabhängigen sicheren und zuverlässigen Verschluss der Austrittsöffnungen gewährleistet, sondern es zugleich gestattet, mit einem einfachen konstruktiven Aufbau äussere° Verunreinigungen der Austrittsöffnungen zu beseitigen.The object of the invention is to provide a device which not only ensures an independent of the position of the carriage safe and reliable closure of the outlet openings, but at the same time allows to eliminate exterior with a simple structure ° impurities of the outlet openings.

Diese Aufgabe wird mit den im kennzeichnenden Teil des Patentanspruches 1 angegebenen Merkmalen gelöst.This object is achieved with the features specified in the characterizing part of patent claim 1.

Die Vorteile der erfindungsgemässen Vorrichtung bestehen darin, dass die Dichtplatte und die Düsenplatte gemeinsam am Schreibkopf befestigt werden, wobei mittels eines Dichtringes eine nahezu absolute Sicherheit gegen das Austreten von Tinte gewährleistet ist. Weiterhin ist es ein Vorteil, dass durch das als Dichtplatte auf derDüsenplatte verschwenkbare und einen Ausschnitt aufweisende Abdeckelement auch bei freigegebenen Austrittsöffnungen der grösste Teil der Düsenplatte abgedeckt bleibt, und somit eine zusätzliche Reinigung entfallen kann. Weiterhin ist es ein Vorteil, dass die scharfen Kanten des Ausschnittes in der Dichtplatte ein sehr wirksames Reinigungselement für die Austrittsöffnungen der Düsenplatte darstellen, da beim Verschwenken der Dichtplatte und damit auch des Ausschnittes über die Austrittsöffnungen hinweg äussere Verunreinigungen sicher beseitigt werden.The advantages of the device according to the invention are that the sealing plate and the nozzle plate are fastened together on the write head, with an almost absolute security against leakage of ink being ensured by means of a sealing ring. Furthermore, it is an advantage that the cover element, which can be pivoted as a sealing plate on the nozzle plate and has a cutout, also covers most of the nozzle plate even when the outlet openings are released, and additional cleaning can thus be omitted. It is also an advantage that the sharp edges of the cutout in the sealing plate represent a very effective cleaning element for the outlet openings of the nozzle plate, since when the sealing plate and thus also the cutout are pivoted, external impurities are reliably removed.

Eine Ausgestaltung der Erfindung sieht vor, dass die Dichtplatte drehbar gelagert ist, und in einfacher Weise über einen Kurbelmechanismus verschwenkbar ist. Damit ist ein einfacher Aufbau verbunden, der den Gesamtaufbau des Schreibkopfes nur unwesentlich beeinflusst. Die Dichtplatte kann gemäss weiterer Ausgestaltung der Erfindung mit einer Folie, z. B. mit einer Teflonfolie beschichtet sein, die eine leicht gängige Bewegung bei sehr grosser Verschleissfestigkeit ermöglicht. Das wirkt sich wiederum günstig auf die Dimensionierung des Antriebselementes aus.An embodiment of the invention provides that the sealing plate is rotatably mounted and can be pivoted in a simple manner via a crank mechanism. This is associated with a simple structure which has only an insignificant effect on the overall structure of the write head. According to a further embodiment of the invention, the sealing plate can be covered with a film, e.g. B. be coated with a Teflon film, which allows a smooth movement with very high wear resistance. This in turn has a favorable effect on the dimensioning of the drive element.

Einzelheiten der Erfindung werden im folgenden anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles erläutert. Dabei zeigt:

  • Fig. 1 einen Schreibkopf in Seitenansicht und
  • Fig. 2 den Schreibkopf gemäss Fig. 1 in Vorderansicht mit Einzelheiten des Antriebsmechanismus.
Details of the invention are explained below with reference to an embodiment shown in the drawings. It shows:
  • Fig. 1 shows a print head in side view
  • Fig. 2 shows the write head of FIG. 1 in a front view with details of the drive mechanism.

Der in Fig. 1 dargestellte Schreibkopf besteht aus einem Kunststoffkörper 1, in dem zwischen einem Versorgungsteil 2 und der einem hier nicht dargestellten Aufzeichnungsträger zugewandten Begrenzungsfläche des Schreibkopfes die Tintenkanäle 3 verlaufen. Der Schreibkopf ist mit einer Düsenplatte 4 abgeschlossen, über deren Austrittsöffnungen 5 in Richtung auf den Aufzeichnungsträger Tintentröpfchen ausgestossen werden. Die Antriebselemente für die Tintenkanäle 3 und damit für den Ausstoss von Tintentröpfchen sind beispielsweise Piezoelemente. Diese befinden sich im Inneren des Schreibkopfes und sind bei dieser Darstellung nicht sichtbar. Die Düsenplatte 4 ist von einem Dichtring 6 umgeben. Zur Abdeckung und zur Reinigung der Austrittsöffnungen 5 ist die Dichtplatte 7 vorgesehen, die auf ihrer, dem Schreibkopf zugewandten Seite mit einer Folie, beispielsweise mit einer Teflonfolie 8 überzogen ist. Die Dichtplatte 7 ist mittels eines federnden Bügels 9 zusammen mit der Düsenplatte 4 am Schreibkopf 1 befestigt. Am Schreibkopf 1 sind zu diesem Zweck zwei Ansätze 10 und 11 vorgesehen, in die der Bügel 9 eingreift. Er wird mittels einer Spannfeder 12 gehalten. Dabei wird der Dichtring durch die Andruckkraft des Bügels 9 verformt, so dass eine exakte Anlage der Düsenplatte 4 auf der Begrenzungs- oder Mündungsfläche des Schreibkopfs und damit eine sehr sichere Abdichtung gewährleistet ist. Die Dichtplatte 7 ist an einem Stift 13 der ebenfalls am Schreibkopf befestigt ist, drehbar gelagert.The print head shown in FIG. 1 consists of a plastic body 1, in which the ink channels 3 run between a supply part 2 and the boundary surface of the write head facing a recording medium (not shown here). The write head is closed with a nozzle plate 4, through the outlet openings 5 of which ink droplets are ejected in the direction of the recording medium. The drive elements for the ink channels 3 and thus for the ejection of ink droplets are, for example, piezo elements. These are located inside the print head and are not visible in this representation. The nozzle plate 4 is surrounded by a sealing ring 6. To cover and to clean the outlet openings 5, the sealing plate 7 is provided, which is coated on its side facing the print head with a film, for example with a Teflon film 8. The sealing plate 7 is fastened to the write head 1 together with the nozzle plate 4 by means of a resilient bracket 9. For this purpose, two lugs 10 and 11 are provided on the write head 1, in which the bracket 9 engages. It is held by means of a tension spring 12. The sealing ring is deformed by the pressing force of the bracket 9, so that an exact contact of the nozzle plate 4 on the boundary or mouth surface of the print head and thus a very secure seal is ensured. The sealing plate 7 is rotatably mounted on a pin 13 which is also attached to the writing head.

Die Wirkungsweise der Vorrichtung wird im folgenden unter Bezugnahme auf Fig. 2 erläutert. Die Darstellung nach Fig. 2 zeigt den Schreibkopf von vorne. Vor der Düsenplatte 4 ist die Dichtplatte 7 um den Stift 13 derart verschwenkbar gelagert, dass der Ausschnitt 14 der Dichtplatte 7 entweder die Austrittsöffnungen der Düsenplatte 7 verschliesst (dargestellte Lage in Fig. 2) oder freigibt. Die Dichtplatte 7 ist in ihren Abmessungen derart dimensioniert, dass sie sowohl in der offenen Stellung (Austrittsöffnungen freigegeben) als auch in der geschlossenen Stellung (Austrittsöffnungen verschlossen) die Düsenplatte abdeckt. Die Dichtfläche der Dichtplatte 7 ist damit in jedem Fall abgedeckt, so dass es keiner zusätzlichen Reinigung der Dichtplatte bedarf. Die Verschwenkung erfolgt über einen Kurbelmechanismus 17, dessen Kurbelstift 15 in eine schlitzförmige Ausnehmung 16 der Dichtplatte 7 eingreift. Der Kurbelmechanismus 17 wird mittels eines hier nicht dargestellten Antriebselementes zwischen zwei Anschlägen 18 und 19 hin- und herbewegt, wodurch sich auch die Dichtplatte 7 mit dem Ausschnitt 14 auf der Düsenplatte 4 verschiebt, und die Austrittsöffnungen verschliesst oder freigibt. Diese Anordnung ermöglicht eine Bewegung der Dichtplatte 7 unabhängig von der Stellung des Schreibkopfes, d.h. die Dichtplatte 7 und der Antriebsmechanismus 15, 17, 18 und 19 sind dem Schreibkopf unmittelbar zugeordnet.The operation of the device is explained below with reference to FIG. 2. 2 shows the write head from the front. In front of the nozzle plate 4, the sealing plate 7 is pivotally mounted about the pin 13 such that the cutout 14 of the sealing plate 7 either closes the outlet openings of the nozzle plate 7 (position shown in FIG. 2) or releases it. The dimensions of the sealing plate 7 are such that it covers the nozzle plate both in the open position (outlet openings released) and in the closed position (outlet openings closed). The sealing surface of the sealing plate 7 is thus covered in any case, so that no additional cleaning of the sealing plate is required. The pivoting takes place via a crank mechanism 17, the crank pin 15 of which engages in a slot-shaped recess 16 of the sealing plate 7. The cure Bel Mechanism 17 is moved back and forth between two stops 18 and 19 by means of a drive element, not shown here, whereby the sealing plate 7 with the cutout 14 moves on the nozzle plate 4, and closes or releases the outlet openings. This arrangement enables the sealing plate 7 to move independently of the position of the writing head, ie the sealing plate 7 and the drive mechanism 15, 17, 18 and 19 are directly associated with the writing head.

Gestaltet man, wie durch die Erfindung vorgeschlagen, den Ausschnitt 14 scharfkantig aus, so wird bei jeder Schwenkbewegung der Dichtplatte und damit bei jeder Schwenkbewegung des Ausschnittes 14 eine Wischfunktion durchgeführt, mit der die Austrittsöffnungen der Düsenplatte sicher von äusseren Verunreinigungen wie Staubteilchen, Tintenrestchen usw. gereinigt werden.If, as proposed by the invention, the cutout 14 is made sharp-edged, a wiping function is carried out with each pivoting movement of the sealing plate and thus with each pivoting movement of the cutout 14, with which the outlet openings of the nozzle plate are reliably protected from external contaminants such as dust particles, residual ink, etc. getting cleaned.

Die Dichtplatte 7 weist nur eine sehr geringe Dicke auf, so dass der Abstand zwischen z. B. einer Schreibwalze und dem Schreibkopf nur unwesentlich reduziert wird.The sealing plate 7 has only a very small thickness, so that the distance between z. B. a platen and the print head is only slightly reduced.

Claims (4)

1. A device for capping and cleaning the outlet openings of a nozzle plate in an ink jet print head using a capping element which serves to cap the outlet openings, comprising an aperture (14) which is located in front of and exposes the outlet openings (5) during the printing periods, characterised in that the capping element is a sealing plate (7) which is directly movable onto the nozzle plate (4),
that the aperture (14) which is provided in the sealing plate (7), has sharp edges and carries out a cleaning function during movement onto the nozzle plate (4),
that the sealing plate (7) and the nozzle plate (4) are supported on the print head (1) by a common pressure element (9, 12) and can be pressed against the boundary surface of the print head (1), at which the ink channels (3) terminate, and
that a sealing ring (6) which is deformed by the pressure element (9), is arranged between the boundary surface of the print head and the nozzle plate (4).
2. A device as claimed in Claim 1, characterised in that the sealing plate (7) is rotatably mounted on a pin (13) which is secured to the print head (1), and that the sealing plate (7) has a slotted recess (16), into which the crank pin (15) of a crank mechanism (17) engages.
3. A device as claimed in Claim 1 and 2, characterised in that the sealing plate (7) covers the nozzle plate (4) in both the open and also in the closed position.
4 A device as claimed in Claim 1 to 3, characterised in that the sealing plate (7) is covered with a teflon foil (8) on the side facing the nozzle plate (4).
EP83101787A 1982-02-26 1983-02-23 Capping and cleaning device for ink jet print heads Expired EP0087759B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3207072 1982-02-26
DE19823207072 DE3207072A1 (en) 1982-02-26 1982-02-26 COVER AND CLEANING DEVICE FOR INK WRITING HEADS

Publications (3)

Publication Number Publication Date
EP0087759A2 EP0087759A2 (en) 1983-09-07
EP0087759A3 EP0087759A3 (en) 1985-05-15
EP0087759B1 true EP0087759B1 (en) 1987-01-28

Family

ID=6156845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101787A Expired EP0087759B1 (en) 1982-02-26 1983-02-23 Capping and cleaning device for ink jet print heads

Country Status (4)

Country Link
US (1) US4500894A (en)
EP (1) EP0087759B1 (en)
JP (1) JPS58158262A (en)
DE (1) DE3207072A1 (en)

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Also Published As

Publication number Publication date
EP0087759A3 (en) 1985-05-15
US4500894A (en) 1985-02-19
JPS58158262A (en) 1983-09-20
JPH0351586B2 (en) 1991-08-07
DE3207072A1 (en) 1983-09-15
EP0087759A2 (en) 1983-09-07

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