EP3536506B1 - Ink jet printing apparatus - Google Patents

Ink jet printing apparatus Download PDF

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Publication number
EP3536506B1
EP3536506B1 EP18160432.3A EP18160432A EP3536506B1 EP 3536506 B1 EP3536506 B1 EP 3536506B1 EP 18160432 A EP18160432 A EP 18160432A EP 3536506 B1 EP3536506 B1 EP 3536506B1
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EP
European Patent Office
Prior art keywords
component
cleaning
movement
cleaning belt
auxiliary frame
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.)
Active
Application number
EP18160432.3A
Other languages
German (de)
French (fr)
Other versions
EP3536506A1 (en
Inventor
Michael Postels
Andreas MÜLLER
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to EP18160432.3A priority Critical patent/EP3536506B1/en
Priority to JP2019000791U priority patent/JP3221394U/en
Priority to CN201910171190.6A priority patent/CN110239220B/en
Publication of EP3536506A1 publication Critical patent/EP3536506A1/en
Application granted granted Critical
Publication of EP3536506B1 publication Critical patent/EP3536506B1/en
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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
    • B41J2/16538—Cleaning of print head nozzles using wiping constructions with brushes or wiper blades perpendicular to the nozzle plate
    • 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
    • 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
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • 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
    • B41J2002/1655—Cleaning of print head nozzles using wiping constructions with wiping surface parallel with nozzle plate and mounted on reels, e.g. cleaning ribbon cassettes

Definitions

  • the present invention relates to a printing device for inkjet, comprising a pressure bar and a cleaning tape for wiping the pressure bar.
  • the wiping movement is a multidimensional relative movement between the pressure bar and the cleaning belt.
  • the pressure bar can move relative to the cleaning belt or the cleaning belt can move relative to the pressure bar or both can move relative to one another.
  • the first directional or movement component can be generated by a movement of the pressure bar and the second directional and movement component, which is perpendicular relative to the first directional and movement component, can be generated by a movement of the cleaning tape.
  • the multidimensional wiping movement preferably follows a regular movement pattern.
  • the wiping movement can, for example, have a sinusoidal shape or the shape of an elongated cycloid (English: prolate cycloid).
  • the regular wiping pattern ensures that the nozzle surface is cleaned evenly.
  • the oscillating device can move the subframe to and fro in order to produce the first component in addition to the second component.
  • the subframe can be mounted in a universal joint.
  • the mechanism can have a crank mechanism that moves the subframe back and forth.
  • the mechanism can have a winding device for winding up the cleaning tape, a feed movement of the cleaning tape generated by the winding device forming the first component.
  • the cleaning tape can be a cleaning cloth with cloth fibers made of plastic.
  • the cloth fibers can have a diameter ranging from 2 to 15 ⁇ m.
  • the nozzle orifices in the nozzle surface can have a diameter which is 6 to 30 ⁇ m.
  • the ratio of fiber diameter: nozzle diameter can be from 1: 5 to 1: 2.
  • the pile height of the cloth fibers can be 0.1 to 1.0 mm.
  • the cleaning device to which the cleaning tape, the pressure element, the winding device and the auxiliary frame belong, can be designed as a unit or cassette that can be removed from the printing press.
  • the winding device can have a first reel and a second reel, the first reel serving as a supply reel for unwinding cleaning tape that is still clean and the second reel serving as a so-called dirty cloth reel for winding up cleaning tape that has been soiled after cleaning.
  • a first pair of friction rollers can be arranged along the course of the belt between the first spool and the pressure element and a second pair of friction rollers between the pressure element and the second spool, each of the two pairs of friction rollers being driven by its own motor in order to better control the movement of the cleaning belt .
  • This movement of the cleaning tape can be superimposed by a transverse movement in order to generate the multi-dimensional wiping movement.
  • the mentioned auxiliary frame together with the pressure element and the cleaning belt guided by the pressure element can be moved in the transverse direction or, alternatively, the pressure element together with the cleaning belt guided by it can be moved in a lateral transverse direction relative to the auxiliary frame.
  • the drive system for generating the lateral transverse movement of the auxiliary frame can preferably be a crank gear or eccentric drive and can alternatively be a linear drive, a screw gear, a pneumatic cylinder or the like.
  • the pressure element is designed as a pressure roller, this pressure roller can either be a crowned roller or a cylindrical roller.
  • the design as a spherical roller is advantageous if the auxiliary frame, together with the spherical roller mounted in it, is tilted or pivoted back and forth to produce the transverse movement.
  • the design as a cylindrical roller is advantageous if the cylindrical roller mounted in the auxiliary frame traverses relative to the auxiliary frame in order to produce the transverse movement.
  • the cylindrical roller performs a linear oscillation relative to the subframe in the direction of the axis of rotation of the cylindrical roller.
  • FIG 2 shows one of the Figure 1b corresponding side view, but with more components of the cleaning device.
  • the auxiliary frame 9 is pivotably mounted in a main frame 11 via a pair of parallel rockers 12.
  • the pivoting movement of the auxiliary frame 9 and thus of the cleaning belt 3 in the lateral direction with respect to the pressure beam 1 is driven by a drive system which comprises a motor M1 and a crank mechanism 13.
  • a drive system which comprises a motor M1 and a crank mechanism 13.
  • the cleaning tape 3 is in continuous contact with the nozzle surface 2, which in FIG Figure 2 is not shown.
  • the winding device 5 and each pair of friction rollers 8 as well as a gear drive 14, via which a motor M2 drives the feed movement V of the cleaning belt 3, are also mounted in the auxiliary frame 9.
  • the auxiliary frame 9, the parallel rockers 12, the crank mechanism 13 and the motor M1 are part of an oscillating device 15.
  • This oscillating device 15 generates the component y of the wiping movement W.
  • the feed movement V corresponds to the component x of the wiping movement W. From the superposition of the two components x , y results in the multi-dimensional wiping movement W, the shape of which corresponds to the variants in the following Figures 3a to 3c can correspond.
  • FIG 3a a diagram is shown, the abscissa of which shows the component x and the ordinate of the component y of the wiping movement W.
  • the wiping movement W has a sinusoidal shape.
  • Figure 3c also shows a wiping movement W in the form of an elongated cycloid, its turns or loops intersecting one another.

Description

Vorliegende Erfindung betrifft eine Druckvorrichtung für Inkjet, umfassend einen Druckbalken und ein Reinigungsband zum Abwischen des Druckbalkens.The present invention relates to a printing device for inkjet, comprising a pressure bar and a cleaning tape for wiping the pressure bar.

Druckbalken dienen zum seitenbreiten Drucken. Oft sind sie aus einer Reihe von Druckköpfen zusammengesetzt. Jeder Druckkopf hat eine Düsenplatte und die Düsenplatten bilden zusammen die Düsenfläche des Druckbalkens. Diese Düsenfläche wird mit dem Reinigungsband von Zeit zu Zeit abgewischt, was automatisiert erfolgt.Print bars are used for page-wide printing. They are often composed of a number of print heads. Each printhead has a nozzle plate and the nozzle plates together form the nozzle surface of the pressure beam. This nozzle area is wiped off with the cleaning tape from time to time, which is done automatically.

In DE 10028318 A1 ist eine Druckmaschine mit einem Tintenstrahldrucker beschrieben, dessen Düsenfläche mit einem Reinigungsband abgewischt wird, das kontinuierlich an der Fläche vorbeiläuft. Von Nachteil ist, dass dadurch keine gründliche Reinigung des Düsenrands erreicht wird. Die in der Düsenfläche mündenden Düsen haben einen Innenrand, an dem sich bei der Reinigung Tintenreste festsetzen können. Das Reinigungsband des Standes der Technik läuft nur in eine einzige Richtung, die mit der Bedruckstofftransportrichtung parallel sein kann oder dazu quer verlaufen kann. Auf diese Weise ist keine gründliche Reinigung erreichbar.In DE 10028318 A1 describes a printing machine with an inkjet printer, the nozzle surface of which is wiped with a cleaning tape that continuously runs past the surface. The disadvantage is that this does not achieve thorough cleaning of the nozzle edge. The nozzles opening into the nozzle surface have an inner edge on which ink residues can stick during cleaning. The cleaning belt of the prior art only runs in a single direction, which can be parallel to the printing material transport direction or can run transversely thereto. Thorough cleaning cannot be achieved in this way.

In US 2010/0245466 A1 ist eine Vorrichtung beschrieben, bei der ein Druckkopf in eine erste Richtung und ein Reinigungstuch in eine dazu schräge, zweite Richtung bewegt werden, so dass daraus eine Wischbewegung in eine dritte Richtung resultiert.In US 2010/0245466 A1 a device is described in which a print head is moved in a first direction and a cleaning cloth is moved in a second direction, which is inclined thereto, so that a wiping movement in a third direction results.

In US 2014/0125734 A1 ist eine Vorrichtung beschrieben, bei der ein Reinigungstuch in eine erste Richtung und ein Druckkopf in eine dazu senkrechte (nach links oder rechts), zweite Richtung bewegt werden.In US 2014/0125734 A1 describes a device in which a cleaning cloth is moved in a first direction and a print head is moved in a second direction perpendicular thereto (to the left or right).

Aufgabe der Erfindung ist, eine Druckvorrichtung mit einem Reinigungsband zu schaffen, mit dem der Druckbalken gründlich gereinigt wird.The object of the invention is to create a printing device with a cleaning tape with which the pressure beam is thoroughly cleaned.

Diese Aufgabe wird durch eine Druckvorrichtung mit den Merkmalen von Anspruch 1 gelöst.This object is achieved by a printing device with the features of claim 1.

Bei der erfindungsgemäßen Druckvorrichtung ist die Wischbewegung eine mehrdimensionale Relativbewegung zwischen dem Druckbalken und dem Reinigungsband. Zur Erzeugung dieser mehrdimensionalen Wischbewegung kann sich der Druckbalken relativ zum Reinigungsband bewegen oder kann sich das Reinigungsband relativ zum Druckbalken bewegen oder können sich beide relativ zueinander bewegen. Beispielsweise kann die erste Richtungs- oder Bewegungskomponente durch eine Bewegung des Druckbalkens erzeugt werden und kann die relativ zur ersten Richtungs- und Bewegungskomponente senkrechte, zweite Richtungs- und Bewegungskomponente durch eine Bewegung des Reinigungsbands erzeugt werden.In the printing device according to the invention, the wiping movement is a multidimensional relative movement between the pressure bar and the cleaning belt. To generate this multi-dimensional wiping movement, the pressure bar can move relative to the cleaning belt or the cleaning belt can move relative to the pressure bar or both can move relative to one another. For example, the first directional or movement component can be generated by a movement of the pressure bar and the second directional and movement component, which is perpendicular relative to the first directional and movement component, can be generated by a movement of the cleaning tape.

Dadurch, dass das Reinigungsband sozusagen kreuz und quer über die Düsenfläche wischt, erfasst es jeden Umfangsabschnitt des z. B. kreisförmigen Innenrandes jeder Düsenmündung. Durch diese gründliche Reinigung wird sicher vermieden, dass sich an dem Innenrand Tintenreste festsetzen.The fact that the cleaning tape wipes all over the nozzle surface, so to speak, covers every circumferential section of the z. B. circular inner edge of each nozzle mouth. This thorough cleaning reliably prevents ink residues from sticking to the inner edge.

Vorzugsweise folgt die mehrdimensionale Wischbewegung einem regelmäßigen Bewegungsmuster. Hierbei kann die Wischbewegung beispielsweise eine Sinusform oder die Form einer verlängerten Zykloide (Englisch: prolate cycloid) aufweisen. Durch das regelmäßige Wischmuster wird eine gleichmäßige Reinigung der Düsenfläche erreicht.The multidimensional wiping movement preferably follows a regular movement pattern. Here, the wiping movement can, for example, have a sinusoidal shape or the shape of an elongated cycloid (English: prolate cycloid). The regular wiping pattern ensures that the nozzle surface is cleaned evenly.

Es sind verschiedene Weiterbildungen möglich:
Der Mechanismus kann so ausgebildet sein, dass er das Reinigungsband relativ zu dem Druckbalken bewegt, wobei das Reinigungsband die erste Komponente und auch die zweite Komponente der Wischbewegung ausführt.
Das Hilfsgestell kann in Parallelschwingen gelagert sein.Various training courses are possible:
The mechanism can be designed such that it moves the cleaning belt relative to the pressure bar, the cleaning belt executing the first component and also the second component of the wiping movement.
The subframe can be mounted in parallel arms.

Die Schwingeinrichtung kann das Hilfsgestell hin- und herbewegen, um zur zweiten Komponente zusätzlich die erste Komponente zu erzeugen.
Das Hilfsgestell kann in einem Kreuzgelenk gelagert sein.
Der Mechanismus kann ein Kurbelgetriebe aufweisen, welches das Hilfsgestell hin- und herbewegt.
Der Mechanismus kann eine Spuleinrichtung zum Aufwickeln des Reinigungsbands aufweisen, wobei eine von der Spuleinrichtung erzeugte Vorschubbewegung des Reinigungsbandes die erste Komponente bildet.The oscillating device can move the subframe to and fro in order to produce the first component in addition to the second component.
The subframe can be mounted in a universal joint.
The mechanism can have a crank mechanism that moves the subframe back and forth.
The mechanism can have a winding device for winding up the cleaning tape, a feed movement of the cleaning tape generated by the winding device forming the first component.

Das Andrückelement kann als Andrückwalze ausgebildet sein und durch einen Direktantrieb ohne Zwischenschaltung eines Getriebes direkt angetrieben werden. Dazu kann ein Walzenzapfen der Andrückwalze mit einer Motorwelle des Direktantriebs axial fluchten, wobei der Antriebszapfen und die Motorwelle über eine Kupplung miteinander verbunden sein können.The pressure element can be designed as a pressure roller and be driven directly by a direct drive without the interposition of a gear. For this purpose, a roller journal of the pressure roller can be axially aligned with a motor shaft of the direct drive, it being possible for the drive journal and the motor shaft to be connected to one another via a coupling.

Das Reinigungsband kann ohne Waschmittel zur Trockenreinigung der Düsenfläche verwendet werden. Alternativ kann das Reinigungsband zum Waschen der Düsenfläche unter Verwendung eines Waschmittels eingesetzt werden. Hierzu kann das Reinigungsband mit dem Waschmittel vorgefeuchtet sein. Dazu kann die Reinigungseinrichtung der Druckvorrichtung eine Befeuchtungseinrichtung für das Reinigungsband umfassen.The cleaning tape can be used for dry cleaning of the nozzle surface without detergent. Alternatively, the cleaning tape can be used to wash the nozzle surface using a detergent. For this purpose, the cleaning tape can be pre-moistened with the detergent. For this purpose, the cleaning device of the printing device can comprise a moistening device for the cleaning tape.

Das Reinigungsband kann ein Reinigungstuch mit Tuchfasern aus Kunststoff sein. Die Tuchfasern können einen Durchmesser aufweisen, der 2 bis 15 µm beträgt. Die Düsenmündungen in der Düsenfläche können einen Durchmesser aufweisen, welcher 6 bis 30 µm beträgt. Das Verhältnis Faserdurchmesser : Düsendurchmesser kann von 1:5 bis 1:2 betragen. Die Florhöhe der Tuchfasern kann 0,1 bis 1,0 mm betragen.The cleaning tape can be a cleaning cloth with cloth fibers made of plastic. The cloth fibers can have a diameter ranging from 2 to 15 μm. The nozzle orifices in the nozzle surface can have a diameter which is 6 to 30 μm. The ratio of fiber diameter: nozzle diameter can be from 1: 5 to 1: 2. The pile height of the cloth fibers can be 0.1 to 1.0 mm.

Die Reinigungseinrichtung, zu welcher das Reinigungsband, das Andrückelement, die Spuleinrichtung und das Hilfsgestell gehören, kann als aus der Druckmaschine entnehmbare Einheit oder Kassette ausgebildet sein.The cleaning device, to which the cleaning tape, the pressure element, the winding device and the auxiliary frame belong, can be designed as a unit or cassette that can be removed from the printing press.

Die Spuleinrichtung kann eine erste Spule und eine zweite Spule aufweisen, wobei die erste Spule als Vorratsspule zum Abwickeln von noch sauberem Reinigungsband dient und die zweite Spule als sogenannte Schmutztuchspule zum Aufwickeln von nach erfolgter Reinigung verschmutztem Reinigungsband dient.The winding device can have a first reel and a second reel, the first reel serving as a supply reel for unwinding cleaning tape that is still clean and the second reel serving as a so-called dirty cloth reel for winding up cleaning tape that has been soiled after cleaning.

Entlang dem Bandverlauf kann zwischen der ersten Spule und dem Andrückelement ein erstes Reibrollenpaar und zwischen dem Andrückelement und der zweiten Spule ein zweites Reibrollenpaar angeordnet sein, wobei jedes der beiden Reibrollenpaare durch jeweils einen eigenen Motor angetrieben wird, um die Bewegung des Reinigungsbandes besser kontrollieren zu können.A first pair of friction rollers can be arranged along the course of the belt between the first spool and the pressure element and a second pair of friction rollers between the pressure element and the second spool, each of the two pairs of friction rollers being driven by its own motor in order to better control the movement of the cleaning belt .

Die erste Komponente der Wischbewegung kann durch die Vorschubbewegung des Reinigungsbandes gebildet sein und die zweite Komponente kann durch eine seitliche Oszillation des Andrückelements gebildet sein. Hierbei können die Vorschubbewegung und die seitliche Oszillation von ein und demselben Motor angetrieben werden. Um die Vorschubbewegung und die seitliche Oszillation miteinander zu koppeln, kann der Mechanismus ein Getriebe umfassen, zum Beispiel ein Kegelradgetriebe.
Bei der Erzeugung der mehrdimensionalen Wischbewegung kann das Reinigungsband in seine Längsrichtung vorwärts und rückwärts bewegt werden.The first component of the wiping movement can be formed by the feed movement of the cleaning tape and the second component can be formed by a lateral oscillation of the pressure element. The feed movement and the lateral oscillation can be driven by one and the same motor. In order to couple the feed movement and the lateral oscillation with one another, the mechanism can comprise a gear, for example a bevel gear.
When generating the multi-dimensional wiping movement, the cleaning belt can be moved forwards and backwards in its longitudinal direction.

Diese Bewegung des Reinigungsbands kann durch eine Querbewegung überlagert werden, um die mehrdimensionale Wischbewegung zu erzeugen. Um diese Querbewegung zu erzeugen, kann das erwähnte Hilfsgestell mitsamt dem Andrückelement und dem vom Andrückelement geführten Reinigungsband in Querrichtung bewegt werden oder kann alternativ das Andrückelement zusammen mit dem von ihm geführten Reinigungsband relativ zum Hilfsgestell in seitlicher Querrichtung bewegt werden.This movement of the cleaning tape can be superimposed by a transverse movement in order to generate the multi-dimensional wiping movement. To generate this transverse movement, the mentioned auxiliary frame together with the pressure element and the cleaning belt guided by the pressure element can be moved in the transverse direction or, alternatively, the pressure element together with the cleaning belt guided by it can be moved in a lateral transverse direction relative to the auxiliary frame.

Das Antriebssystem zur Erzeugung der seitlichen Querbewegung des Hilfsgestells kann vorzugsweise ein Kurbelgetriebe oder Exzenterantrieb sein und kann alternativ ein Linearantrieb, ein Schraubengetriebe, ein Pneumatikzylinder oder dergleichen sein. Wenn das Andrückelement als Andrückwalze ausgebildet ist, kann diese Andrückwalze entweder eine ballige Walze oder eine zylindrische Walze sein.
Die Ausbildung als ballige Walze ist vorteilhaft, wenn das Hilfsgestell mitsamt der darin gelagerten balligen Walze zur Erzeugung der Querbewegung hin und her gekippt oder geschwenkt wird.
Die Ausbildung als zylindrische Walze ist vorteilhaft, wenn die in dem Hilfsgestell gelagerte zylindrische Walze zur Erzeugung der Querbewegung relativ zu dem Hilfsgestell changiert. Hierbei führt die zylindrische Walze eine Linearschwingung relativ zum Hilfsgestell in Richtung der Rotationsachse der zylindrischen Walze aus.The drive system for generating the lateral transverse movement of the auxiliary frame can preferably be a crank gear or eccentric drive and can alternatively be a linear drive, a screw gear, a pneumatic cylinder or the like. If the pressure element is designed as a pressure roller, this pressure roller can either be a crowned roller or a cylindrical roller.
The design as a spherical roller is advantageous if the auxiliary frame, together with the spherical roller mounted in it, is tilted or pivoted back and forth to produce the transverse movement.
The design as a cylindrical roller is advantageous if the cylindrical roller mounted in the auxiliary frame traverses relative to the auxiliary frame in order to produce the transverse movement. Here, the cylindrical roller performs a linear oscillation relative to the subframe in the direction of the axis of rotation of the cylindrical roller.

Das Andrückelement kann statt als Andrückwalze auch als nicht-rotierendes Andrückelement ausgebildet sein, zum Beispiel als eine Profilstange, über die das Reinigungsband läuft.Instead of a pressure roller, the pressure element can also be designed as a non-rotating pressure element, for example as a profile rod over which the cleaning belt runs.

Es kann eine Sensorik vorhanden sein, die überwacht, dass das Reinigungsband seitlich nicht von dem Andrückelement abläuft. Die Sensorik kann ein Warnsignal geben, wenn das Reinigungsband nicht mehr korrekt auf dem Andrückelement zentriert ist.There can be a sensor system that monitors that the cleaning tape does not run off the side of the pressure element. The sensor system can give a warning signal when the cleaning tape is no longer correctly centered on the pressure element.

Die Vorschubbewegung des Reinigungsbands bei der Reinigung kann kontinuierlich sein oder diskontinuierlich in Intervallen erfolgen.
Vorzugsweise ist die Vorschubrichtung des Reinigungsbands parallel mit der Längsrichtung des Druckbalkens.
Alternativ dazu kann die Vorschubrichtung des Reinigungsbands senkrecht relativ zur Längsrichtung des Druckbalkens sein, wobei die mehrdimensionale Wischbewegung erzeugt wird, indem eine Bewegung des Druckbalkens in seine Längsrichtung mit der Vorschubbewegung des Reinigungsbands in Abstimmung aufeinander erfolgen und überlagert werden.The feed movement of the cleaning belt during cleaning can be continuous or discontinuous at intervals.
The feed direction of the cleaning tape is preferably parallel to the longitudinal direction of the pressure beam.
Alternatively, the feed direction of the cleaning tape can be perpendicular relative to the longitudinal direction of the pressure bar, the multi-dimensional wiping movement being generated by a movement of the pressure bar in its longitudinal direction with the feed movement of the cleaning tape taking place and being superimposed on one another.

Weitere Weiterbildungen ergeben sich auch aus der nachfolgenden Beschreibung von Ausführungsbeispielen und der zugehörigen Zeichnung, in welcher zeigt:

Figur 1a:
eine Frontalansicht eines Druckbalkens und einer Reinigungseinrichtung zum Abwischen des Druckbalkens,
Figur 1g:
eine Seitenansicht des Druckbalkens und eines Andrückelements der Reinigungseinrichtung,
Figur 2:
eine Seitenansicht des Druckbalkens und eines Hilfsgestells mit Teilen der Reinigungseinrichtung,
Figuren 3a bis 3c:
verschiedene Bewegungsformen einer von der Reinigungseinrichtung erzeugten Wischbewegung,
Figur 4a:
eine Frontalansicht einer Spuleinrichtung der Reinigungseinrichtung,
Figur 4b:
eine Schnittdarstellung gemäß der Schnittlinie IVb-IVb in Figur 4a,
Figur 5:
eine Draufsicht auf eine Modifikation der Reinigungseinrichtung und
Figur 6:
eine Seitenansicht der Modifikation.
Further developments can also be found in the following description of exemplary embodiments and the associated drawing, in which:
Figure 1a:
a front view of a pressure beam and a cleaning device for wiping the pressure beam,
Figure 1g:
a side view of the pressure bar and a pressure element of the cleaning device,
Figure 2:
a side view of the pressure beam and an auxiliary frame with parts of the cleaning device,
Figures 3a to 3c:
different forms of movement of a wiping movement generated by the cleaning device,
Figure 4a:
a front view of a winding device of the cleaning device,
Figure 4b:
a sectional view according to the section line IVb-IVb in Figure 4a ,
Figure 5:
a plan view of a modification of the cleaning device and
Figure 6:
a side view of the modification.

In den Figuren 1a bis 6 sind einander entsprechende Elemente und Bauteile mit den gleichen Bezugszeichen bezeichnet.In the Figures 1a to 6 Corresponding elements and components are denoted by the same reference numerals.

Figur 1a zeigt eine Druckvorrichtung aus einer der Bedruckstofftransportrichtung entsprechenden Blickrichtung. Die Druckvorrichtung umfasst einen Druckbalken 1 für seitenbreiten Inkjetdruck mit einer Düsenfläche 2, aus deren Düsen beim Drucken Tinte ausgestoßen wird. Der Druckbalken 1 umfasst eine Reihe von Druckköpfen, die sich über die gesamte Breite des bogen- oder bahnförmigen Bedruckstoffs erstreckt. Unter dem Druckbalken 1 ist eine Reinigungseinrichtung angeordnet, die ein Reinigungsband 3 zum Abwischen der Düsenfläche 2 umfasst. Figure 1a shows a printing device from a viewing direction corresponding to the printing material transport direction. The printing device comprises a printing beam 1 for page-width inkjet printing with a nozzle surface 2, from whose nozzles ink is ejected during printing. The printing beam 1 comprises a number of print heads which extend over the entire width of the sheet or web-shaped printing material. A cleaning device, which comprises a cleaning tape 3 for wiping the nozzle surface 2, is arranged below the pressure beam 1.

Die Reinigungseinrichtung umfasst weiterhin ein Andrückelement 4, welches beim Abwischen das Reinigungsband 3 in Kontakt mit der Düsenfläche 2 hält. Eine Spuleinrichtung 5 mit einer ersten Spule 6 und zweiten Spule 7 gehört ebenso zur Reinigungseinrichtung. Die erste Spule 6 dient zum Abwickeln von sauberem Reinigungsband 3 und die zweite Spule 7 zum Aufwickeln von verschmutztem Reinigungsband 3. Zum Antreiben einer Vorschubbewegung V des Reinigungsbands 3 können ein oder mehrere Reibrollenpaare 8 vorhanden sein. Wie in der Zeichnung mit unterschiedlichen Vorzeichen angedeutet, kann die Richtung der Vorschubbewegung V während der Reinigung wechseln.The cleaning device further comprises a pressure element 4, which holds the cleaning tape 3 in contact with the nozzle surface 2 during wiping. A winding device 5 with a first coil 6 and a second coil 7 also belongs to the cleaning device. The first reel 6 is used to unwind clean cleaning tape 3 and the second reel 7 to wind up dirty cleaning tape 3. One or more pairs of friction rollers 8 can be provided to drive a feed movement V of the cleaning tape 3. As indicated in the drawing with different signs, the direction of the feed movement V can change during cleaning.

Figur 1b zeigt Teile der Druckvorrichtung aus einer Blickrichtung, die quer zur Bedruckstofftransportrichtung ist. Das Andrückelement 4 ist in einem Hilfsgestell 9 über eine Federung 10 gelagert, die eine Hubhöhe H kompensiert, die bei einem seitlichen Schwenken des Hilfsgestells 9 auftritt. Die Federung 10 greift an Walzenzapfen des Andrückelements 4 oder an Drehlagern an, in denen die Walzenzapfen sitzen. Figure 1b shows parts of the printing device from a viewing direction which is transverse to the direction of transport of printing material. The pressing element 4 is mounted in an auxiliary frame 9 via a suspension 10 which compensates for a lifting height H that occurs when the auxiliary frame 9 is pivoted to the side. The suspension 10 engages the roll journals of the pressure element 4 or pivot bearings in which the roll journals sit.

Das Andrückelement 4 hat einen Walzenkörper, der ballig oder tonnenförmig ist. Der ballige Walzenkörper hat einen zylindrischen Mittelabschnitt und daran anschließend kegelstumpfförmige Endabschnitte mit Fasen. Der zylindrische Mittelabschnitt ist axial länger als die Summe aus der Breite der Düsenfläche 2 und der doppelten Amplitude der seitlichen Komponente y der Wischbewegung W. Das Reinigungsband 3 ist in Figur 1b nicht mit dargestellt.The pressure element 4 has a roller body which is spherical or barrel-shaped. The spherical roller body has a cylindrical central section and then frustoconical end sections with chamfers. The cylindrical central section is axially longer than the sum of the width of the nozzle surface 2 and twice the amplitude of the lateral component y of the wiping movement W. The cleaning belt 3 is in Figure 1b not shown.

Figur 2 zeigt eine der Figur 1b entsprechende Seitenansicht, jedoch mit mehr Bauteilen der Reinigungseinrichtung. Das Hilfsgestell 9 ist in einem Hauptgestell 11 über ein Paar Parallelschwingen 12 schwenkbar gelagert. Die Schwenkbewegung des Hilfsgestells 9 und somit des Reinigungsbands 3 in Seitenrichtung bezüglich des Druckbalkens 1 wird durch ein Antriebssystem angetrieben, das einen Motor M1 und ein Kurbelgetriebe 13 umfasst. Durch das Hin- und Herschwenken des Hilfsgestells 9 führt das Reinigungsband 3 die Komponente y der Wischbewegung W aus. Figure 2 shows one of the Figure 1b corresponding side view, but with more components of the cleaning device. The auxiliary frame 9 is pivotably mounted in a main frame 11 via a pair of parallel rockers 12. The pivoting movement of the auxiliary frame 9 and thus of the cleaning belt 3 in the lateral direction with respect to the pressure beam 1 is driven by a drive system which comprises a motor M1 and a crank mechanism 13. By pivoting the auxiliary frame 9 to and fro, the cleaning belt 3 executes the component y of the wiping movement W.

Während der Wischbewegung W steht das Reinigungsband 3 mit der Düsenfläche 2 ununterbrochen in einem Kontakt, der in Figur 2 nicht dargestellt ist. Die Spuleinrichtung 5 und jedes Reibrollenpaar 8 sowie ein Zahnradgetriebe 14, über welches ein Motor M2 die Vorschubbewegung V des Reinigungsbands 3 antreibt, sind ebenfalls im Hilfsgestell 9 gelagert. Das Hilfsgestell 9, die Parallelschwingen 12, das Kurbelgetriebe 13 und der Motor M1 sind Bestandteile einer Schwingeinrichtung 15. Diese Schwingeinrichtung 15 erzeugt die Komponente y der Wischbewegung W. Die Vorschubbewegung V entspricht der Komponente x der Wischbewegung W. Aus der Überlagerung der beiden Komponenten x, y resultiert die mehrdimensionale Wischbewegung W, deren Form den Varianten in den nachfolgenden Figuren 3a bis 3c entsprechen kann.During the wiping movement W, the cleaning tape 3 is in continuous contact with the nozzle surface 2, which in FIG Figure 2 is not shown. The winding device 5 and each pair of friction rollers 8 as well as a gear drive 14, via which a motor M2 drives the feed movement V of the cleaning belt 3, are also mounted in the auxiliary frame 9. The auxiliary frame 9, the parallel rockers 12, the crank mechanism 13 and the motor M1 are part of an oscillating device 15. This oscillating device 15 generates the component y of the wiping movement W. The feed movement V corresponds to the component x of the wiping movement W. From the superposition of the two components x , y results in the multi-dimensional wiping movement W, the shape of which corresponds to the variants in the following Figures 3a to 3c can correspond.

In Figur 3a ist ein Diagramm dargestellt, dessen Abszisse die Komponente x und dessen Ordinate die Komponente y der Wischbewegung W zeigt. Bei dieser Variante hat die Wischbewegung W eine Sinusform.In Figure 3a a diagram is shown, the abscissa of which shows the component x and the ordinate of the component y of the wiping movement W. In this variant, the wiping movement W has a sinusoidal shape.

Figur 3b zeigt ein Diagramm mit einer Variante der Wischbewegung W, bei welcher diese die Form einer verlängerten Zykloide hat. Figure 3b shows a diagram with a variant of the wiping movement W, in which this has the shape of an elongated cycloid.

Figur 3c zeigt ebenfalls eine Wischbewegung W in Form einer verlängerten Zykloide, wobei sich deren Windungen oder Schleifen einander überschneiden. Figure 3c also shows a wiping movement W in the form of an elongated cycloid, its turns or loops intersecting one another.

In den Figuren 4a und 4b ist die Spuleinrichtung 5 im Detail dargestellt. Jede Spule 6, 7 ist mit einem Freilauf 18 ausgestattet, wobei der eine Freilauf 18 im Uhrzeigersinn sperrend wirkt und der andere Freilauf 18 entgegen dem Uhrzeigersinn sperrend wirkt. Die beiden Freiläufe 18 sind also zueinander gegenläufig oder gegensinnig wirkend. Ein Motor M2 treibt über zwei Zahnradzüge, die in einem Motoritzel voneinander abzweigen, die Spulen 6, 7 an. Zu dem einen Zahnradzug gehört das Zahnrad 20, welches über den einen Freilauf 18 mit der Spule 7 verbunden ist. Je nach Drehrichtung des Motors M2 sperrt der eine Freilauf 18 und rutscht der andere Freilauf 18 durch. Dadurch wird erreicht, dass die Vorschubbewegung V des Reinigungsbands 3 vorwärts und rückwärts bzw. in positiver und negativer Richtung erfolgen kann.In the Figures 4a and 4b the winding device 5 is shown in detail. Each coil 6, 7 is equipped with a freewheel 18, one freewheel 18 having a locking effect in the clockwise direction and the other freewheel 18 having a locking effect in the counterclockwise direction. The two freewheels 18 are therefore opposite to one another or acting in opposite directions. A motor M2 drives the coils 6, 7 via two gear trains that branch off from one another in a motor pinion. One gear train includes gear 20, which is connected to coil 7 via one freewheel 18. Depending on the direction of rotation of the motor M2, one freewheel 18 blocks and the other freewheel 18 slips through. What is achieved thereby is that the feed movement V of the cleaning tape 3 can take place forwards and backwards or in a positive and negative direction.

Bei dem zuvor beschriebenen Ausführungsbeispiel wird die Komponente x der Wischbewegung W allein durch die Vorschubbewegung V des Reinigungsbands 3 erzeugt.In the exemplary embodiment described above, the component x of the wiping movement W is generated solely by the feed movement V of the cleaning tape 3.

Bei der in den Figuren 5 und 6 dargestellten Modifikation wird die Komponente X durch eine Schwingung des Hilfsgestells 3 oder durch eine Überlagerung dieser Schwingung mit der Vorschubbewegung V erzeugt. Der Motor M1 treibt die beiden zueinander orthogonalen Schwingungen des Hilfsgestells 9 an, sowohl die Schwingung zur Erzeugung der Komponente x als auch die Schwingung zur Erzeugung der Komponente y. Hierbei ist das Hilfsgestell 9 nicht in den Parallelschwingen gelagert, sondern über ein Kreuzgelenk 16 mit dem Hauptgestell 11 verbunden. Das Kurbelgetriebe 13 erzeugt die Schwingung entsprechend der Komponente x um die eine Achse des Kreuzgelenks 16 und ein weiteres Kurbelgetriebe 21 erzeugt die Schwingung entsprechend der Komponente y um die andere Achse des Kreuzgelenks 16.In the Figures 5 and 6 The modification shown, the component X is generated by an oscillation of the subframe 3 or by superimposing this oscillation with the feed movement V. The motor M1 drives the two mutually orthogonal oscillations of the subframe 9, both the oscillation for generating the component x and the oscillation for generating the component y. In this case, the auxiliary frame 9 is not mounted in the parallel rockers, but is connected to the main frame 11 via a universal joint 16. The crank gear 13 generates the oscillation corresponding to the component x around one axis of the universal joint 16 and another crank gear 21 generates the oscillation corresponding to the component y about the other axis of the universal joint 16.

Die beiden Kurbelgetriebe 13, 21 sind über ein Kegelradgetriebe 17 miteinander verbunden, wobei das Kurbelgetriebe 13 an dem einen Kegelrad des Kegelradgetriebes 17 exzentrisch angreift und das Kurbelgetriebe 21 an dem anderen Kegelrad exzentrisch angreift. Bei der Modifikation ist der Motor M2 nicht erforderlich, weil der Motor M1 auch die Vorschubbewegung V des Reinigungsbands 3 erzeugt. Dazu ist die Welle des Kegelrads, welches mit dem Motor M1 koaxial angeordnet ist, mit der Spule 7 zum Aufwickeln verbunden. Die Spule 6 zum Abwickeln kann durch eine Bremse 19 gebremst werden. Die Bremse 19 ist vorteilhaft, um in denjenigen Abschnitt des Reinigungsbands 3, der zwischen den Spulen 6 und 7 liegt und über das Andrückelement 4 läuft, eine für die Reinigung vorteilhafte Zugspannung aufzubauen. Bei der Modifikation sind das Hilfsgestell 9, das Kreuzgelenk 16, der Motor M1, die Kurbelgetriebe 13, 21 und das Kegelradgetriebe 17 Bestandteile der Schwingeinrichtung 15.The two crank gears 13, 21 are connected to one another via a bevel gear 17, the crank gear 13 engaging eccentrically on one bevel gear of the bevel gear 17 and the crank gear 21 engaging the other bevel gear eccentrically. In the modification, the motor M2 is not required because the motor M1 also generates the feed movement V of the cleaning tape 3. For this purpose, the shaft of the bevel gear, which is arranged coaxially with the motor M1, is connected to the reel 7 for winding. The reel 6 for unwinding can be braked by a brake 19. The brake 19 is advantageous in order to build up a tensile stress which is advantageous for cleaning in that section of the cleaning tape 3 which lies between the reels 6 and 7 and runs over the pressure element 4. In the modification, the subframe 9, the universal joint 16, the motor M1, the crank mechanisms 13, 21 and the bevel gear mechanism 17 are components of the oscillating device 15.

Bei allen zuvor dargestellten Ausführungsbeispielen werden bei der Reinigung die innenliegenden Düsenkanten aus allen Richtungen vom Reinigungsband 3 überstrichen, was durch die mehrdimensionale Wischbewegung W sichergestellt ist.In all the exemplary embodiments shown above, the inner nozzle edges are swept over from all directions by the cleaning tape 3 during cleaning, which is ensured by the multi-dimensional wiping movement W.

BezugszeichenlisteList of reference symbols

11
DruckbalkenPressure beam
22
DüsenflächeNozzle area
33
ReinigungsbandCleaning tape
44th
AndrückelementPressure element
55
SpuleinrichtungWinding device
66th
SpuleKitchen sink
77th
SpuleKitchen sink
88th
ReibrollenpaarPair of friction rollers
99
HilfsgestellSubframe
1010
Federungsuspension
1111
HauptgestellMain frame
1212
ParallelschwingeParallel swing arm
1313th
KurbelgetriebeCrank gear
1414th
ZahnradgetriebeGear transmission
1515th
SchwingeinrichtungVibration device
1616
KreuzgelenkUniversal joint
1717th
KegelradgetriebeBevel gears
1818th
FreilaufFreewheel
1919th
Bremsebrake
2020th
Zahnradgear
2121st
KurbelgetriebeCrank gear
HH
HubhöheLifting height
M1M1
Motorengine
M2M2
Motorengine
VV
VorschubbewegungFeed movement
WW.
WischbewegungSwiping motion
xx
Komponentecomponent
yy
Komponentecomponent

Claims (8)

  1. Printing device for inkjet printing comprising a print bar (1) and a cleaning belt (3) for wiping a nozzle surface (2) of the print bar (1),
    wherein a mechanism for creating a wiping movement (W) between the print bar (1) and the cleaning belt (3) is provided,
    the mechanism comprising a pressure element (4) for pressing the cleaning belt (3) against the print bar (1),
    and wherein the wiping movement (W) has a first component (x) and a second component (y) perpendicular to the first component,
    characterized
    in that during the wiping movement (W), the cleaning belt (3) is continuously in contact with the nozzle surface (2),
    the pressure element (4) and the cleaning belt (3) jointly carry out the second component (y), and
    the pressure element (4) is supported in an auxiliary frame (9) and the mechanism has an oscillation device (15) for moving the auxiliary frame (9) to and fro to create the second component (y).
  2. Printing device according to claim 1,
    characterized
    in that the mechanism moves the cleaning belt (3) relative to the print bar (1) and the cleaning belt (3) carries out the first component (x) and the second component (y).
  3. Printing device according to claim 1,
    characterized
    in that the auxiliary frame (9) is supported in parallel rockers (12).
  4. Printing device according to claim 1,
    characterized
    in that the oscillation device (14) moves the auxiliary frame (9) to and from to additionally create the first component (x).
  5. Printing device according to claim 4,
    characterized
    in that the auxiliary frame (9) is supported in a universal joint(16).
  6. Printing device according to any one of claims 1 to 5,
    characterized
    in that the mechanism includes at least one crank gearing (13, 21) that moves the auxiliary frame (9) to and fro.
  7. Printing device according to any one of claims 1 to 3,
    characterized
    in that the mechanism includes a reel device (5) for winding up the cleaning belt (3) and in that a cleaning belt (3) advancing movement (V) generated by the reel device (5) forms the first component (x).
  8. Printing device according to any one of claims 1 to 7,
    characterized
    in that the wiping movement (W) has a sinusoidal shape or the shape of an elongated cycloid.
EP18160432.3A 2018-03-07 2018-03-07 Ink jet printing apparatus Active EP3536506B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18160432.3A EP3536506B1 (en) 2018-03-07 2018-03-07 Ink jet printing apparatus
JP2019000791U JP3221394U (en) 2018-03-07 2019-03-06 Printing device for inkjet
CN201910171190.6A CN110239220B (en) 2018-03-07 2019-03-07 Printing device for ink-jet printing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18160432.3A EP3536506B1 (en) 2018-03-07 2018-03-07 Ink jet printing apparatus

Publications (2)

Publication Number Publication Date
EP3536506A1 EP3536506A1 (en) 2019-09-11
EP3536506B1 true EP3536506B1 (en) 2020-12-09

Family

ID=61598901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18160432.3A Active EP3536506B1 (en) 2018-03-07 2018-03-07 Ink jet printing apparatus

Country Status (3)

Country Link
EP (1) EP3536506B1 (en)
JP (1) JP3221394U (en)
CN (1) CN110239220B (en)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN115135506A (en) * 2020-03-24 2022-09-30 惠普发展公司， 有限责任合伙企业 Maintaining nozzles of a printing apparatus

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Publication number Priority date Publication date Assignee Title
DE10028318B4 (en) 1999-06-28 2017-02-16 Heidelberger Druckmaschinen Ag Method and apparatus for cleaning a printhead of an inkjet printer
US8342639B2 (en) * 2009-03-31 2013-01-01 Fujifilm Corporation Head cleaning method and head cleaning apparatus
JP5149231B2 (en) * 2009-03-31 2013-02-20 富士フイルム株式会社 Head cleaning method and apparatus
JP5698567B2 (en) * 2010-08-31 2015-04-08 富士フイルム株式会社 Droplet discharge device and maintenance method of droplet discharge head
JP5438738B2 (en) * 2011-09-28 2014-03-12 富士フイルム株式会社 Inkjet recording device
JP5653371B2 (en) * 2012-01-06 2015-01-14 富士フイルム株式会社 Nozzle surface cleaning device and image recording device
JP6070084B2 (en) * 2012-11-07 2017-02-01 セイコーエプソン株式会社 Liquid ejector

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
CN110239220A (en) 2019-09-17
CN110239220B (en) 2022-04-05
EP3536506A1 (en) 2019-09-11
JP3221394U (en) 2019-05-23

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