EP1565314B1 - Method for cleaning the screen stencil of a silk-screen printing device and silk-screen printing machine for said method - Google Patents

Method for cleaning the screen stencil of a silk-screen printing device and silk-screen printing machine for said method Download PDF

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Publication number
EP1565314B1
EP1565314B1 EP03772227A EP03772227A EP1565314B1 EP 1565314 B1 EP1565314 B1 EP 1565314B1 EP 03772227 A EP03772227 A EP 03772227A EP 03772227 A EP03772227 A EP 03772227A EP 1565314 B1 EP1565314 B1 EP 1565314B1
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EP
European Patent Office
Prior art keywords
intermediate printing
printing device
roller
screen
cleaning
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EP03772227A
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German (de)
French (fr)
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EP1565314A1 (en
Inventor
Klaus Messmer
Ewald König
Dietmar Weber
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Thieme GmbH and Co KG
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Thieme GmbH and Co KG
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Publication of EP1565314A1 publication Critical patent/EP1565314A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/003—Cleaning arrangements or devices for screen printers or parts thereof
    • B41F35/005—Cleaning arrangements or devices for screen printers or parts thereof for flat screens

Definitions

  • the invention relates to a method for cleaning the screen stencil of a screen printing device, in which a paper web for an intermediate pressure is placed under the screen template and printed by a doctor blade running over it.
  • the invention also relates to a screen printing machine for carrying out this method.
  • a cleaning method and a suitable for performing the cleaning method screen printing machine is from the DE 199 17 794 C2 known.
  • the intermediate printing table is formed as a parallel to the guide rail of the printing table einschwenkbarer table, which is below the guide of the printing table during the printing and is swung up for the intermediate pressure for the purpose of cleaning under the Siebschablone.
  • Machines of this type work satisfactorily, but can not prevent the disadvantage that the screen printing ink dries in part and clogs the screen cloth. It is therefore necessary in screen printing devices, despite the arrangement of an intermediate printing table used for screen cleaning, to stop production in order to clean the screen.
  • the present invention has for its object to perform such a cleaning largely automatically and indeed to avoid production loss during operation. At the same time, it aims to create better working conditions and avoid mis-production.
  • the wetting is carried out by a placed in contact with the underside of the screen template rotating roller or brush, which dips into a cleaning agent.
  • the rotation of the roller or brush, the detergent is conveyed out of the bath and brought to the bottom of the screen template, where it can dissolve dried paint residues, which are then removable at intermediate pressure.
  • the invention also relates to a screen printing machine for carrying out the cleaning method, wherein the screen printing machine is equipped with an intermediate printing device with which a paper web is inserted under the screen template for the purpose of cleaning.
  • the new screen printing machine is characterized by one of the intermediate pressure device associated and arranged transversely to the direction of the intermediate pressure direction of rotation body, which is coatable with a detergent and comes before the intermediate pressure in contact with the underside of the Siebschablone and can be guided along this.
  • the cleaning can be done automatically and in the screen printing machine.
  • a roller which dips into a bath of the detergent.
  • This cleaning agent may be contained in a further development of the invention in a roll comprising the bottom and adapted to the shape of the roll container, wherein the surface of the roll is formed roughened to hold a sufficiently thick layer of the detergent and to bring against the Siebschablone.
  • the roller is driven in rotation, and it engages for this purpose with laterally arranged pinions in a rack, which is arranged next to the screen template on the printing unit.
  • the intermediate pressure device itself can be lowered and raised and thus formed and folded down, wherein a control device may be provided for determining the cleaning cycle, so that, for example, after every second, third or fifth printing, a cleaning printing operation is performed.
  • the roller and its associated container to which the cleaning agent is supplied in a simple manner in the circuit, arranged at the screen stencil facing the end of a slidably mounted in the direction of blade movement paper counter-pressure roller.
  • the roller with the container may be conveniently arranged on a pair of pivot levers which acted upon by pneumatic cylinders so that the lateral pinion of the roller engage in the rack, which runs fixed next to the Siebschablone ,
  • the intermediate pressure roller can be provided with paper and arranged to be movable at least by the length of the screen template, so that before the intermediate pressure, the entire bottom of the screen template with a cleaning agent is wettable. In practice, the wetting in the pressure range is sufficient.
  • the intermediate pressure roller with a unwound paper web can also be an endless strip material for receiving the intermediate pressure may be provided, or even a print carrier roll. In both variants, a continuous cleaning of the endless web or the print carrier roll can be ensured. Consumables in the form of paper then do not accrue.
  • FIG. 1 an intermediate printing device 1 is shown, which is associated with a screen printing machine, not shown. From the screen printing machine held in a frame screen 2 is shown, which is arranged in a known manner between a mobile under them intermediate pressure roller and a squeegee unit lying above it. Fixedly connected to the screen printing machine is also a side and parallel to the longitudinal direction of the screen template 2 extending arranged rack 3, which will be discussed later.
  • the intermediate printing device 1 is equipped within a support frame 4 with a paper web 5, which is removable from a roll and guided so that it can be performed via an intermediate pressure roller 7 and below this again back to a second roller.
  • the paper web 5 is guided within the support frame 4 so that they can join a reciprocating motion of the intermediate pressure roller 7 in the direction of the arrows 8.
  • a transverse to the movement path of the intermediate pressure roller 7 extending roller 9 is arranged, which, as shown in the enlarged view Fig. 2 emerges, immersed in a largely surrounding container 10 which is filled with a liquid detergent. It is a cleaning agent that is able to dissolve the color used in screen printing.
  • the container 10 and guided in it roller 9 are mounted on a crossbar 11 which is mounted at the right end of a respective pivotable about the axis 12 double lever 13.
  • the other lever arm 13a of the double lever is in contact with the plunger 14 of a pneumatic cylinder 15, which allows the double lever 13 from the in Fig. 1 shown position to swing up and down.
  • the roller 9 is provided at one end, on which it is mounted on trunnions in each end wall of the container 10, with a pinion 16 which, upon actuation of the cylinder 15 and upon pivoting of the double lever 13 in the counterclockwise direction in engagement with the rack. 3 is brought, like that in Fig. 2 also shown.
  • the protruding from the support frame 4 intermediate pressure roller 7 has on the one hand a storage and on the other two laterally projecting tabs 17 which can be brought into operative connection with the squeegee unit, not shown, or with its drive.
  • the operation of the intermediate pressure device shown is the following:
  • a pulse is delivered via a corresponding control device, which leads to the fact that during the return of the squeegee unit, the intermediate pressure roller 7, as in Fig. 3 shown, is driven under the screen stencil of the screen printing machine.
  • the pulse of the double lever 13 has been pivoted counterclockwise by the cylinder 15, so that the detergent roller 9 engages with its pinions 16 in the fixedly arranged next to the screen template 2 rack.
  • the roller 9 is guided in a counterclockwise rotating manner on the screen template 2 so that it comes into contact with the underside of the screen template 2.
  • the roller 9 therefore wets the same with cleaning agent, which is conveyed by the rotation of the roller 9 from the container 10 when traveling along the underside of the screen template 2.
  • the detergent is otherwise performed in a manner not shown in detail in the circuit through the container 10, so that the level of the detergent in the container 10 can always be kept constant.
  • the roller 9 can thereby be guided once or even several times at the bottom for wetting the Siebschablonenunterseite, so that the necessary wetting takes place in each case.
  • the intermediate pressure roller 7 is correspondingly often reciprocated by the drive of the doctor blade mechanism for this purpose.
  • the intermediate pressure roller 7 moves along with the paper web 5 completely under the screen template 2, and after lowering the squeegee printing the printing of the remaining color on the paper web 5, which is then deducted accordingly and wound up as waste becomes.
  • the stencil 2 is also cleaned of dried paint residues.
  • the invention provides a very simple way of cleaning a screen stencil 2 of a screen printing machine, which takes place automatically.
  • the device is largely maintenance-free and allows a screen cleaning without significant production downtime.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Screen Printers (AREA)
  • Printing Methods (AREA)

Abstract

A cleaning method for the screen stencil of a silk-screen printing machine. According to the method, prior to an intermediate printing process designed to clean the screen stencil, the underside of the stencil is wetted with a cleaning agent that dissolves dye. An intermediate printing device includes an intermediate printing roll that can be displaced back and forth. A rotating roll that is immersed in a cleaning bath is situated at the front end of the intermediate printing roll. The rotating roll can be brought into contact with the underside of the screen stencil prior to the intermediate printing process by means of a pivoting device.

Description

Die Erfindung betrifft ein Verfahren zur Reinigung der Siebschablone einer Siebdruckeinrichtung, bei dem eine Papierbahn für einen Zwischendruck unter die Siebschablone gebracht und durch eine über diese laufende Rakel bedruckt wird. Die Erfindung betrifft auch eine Siebdruckmaschine zur Durchführung dieses Verfahrens.The invention relates to a method for cleaning the screen stencil of a screen printing device, in which a paper web for an intermediate pressure is placed under the screen template and printed by a doctor blade running over it. The invention also relates to a screen printing machine for carrying out this method.

Ein Reinigungsverfahren und eine zur Durchführung des Reinigungsverfahrens geeignete Siebdruckmaschine ist aus der DE 199 17 794 C2 bekannt. Bei dieser bekannten Maschine ist der Zwischendrucktisch als ein parallel zur Führungsbahn des Drucktisches einschwenkbarer Tisch ausgebildet, der beim Druckvorgang unterhalb der Führung des Drucktisches liegt und für den Zwischendruck zum Zweck der Reinigung unter die Siebschablone hochgeschwenkt wird.A cleaning method and a suitable for performing the cleaning method screen printing machine is from the DE 199 17 794 C2 known. In this known machine, the intermediate printing table is formed as a parallel to the guide rail of the printing table einschwenkbarer table, which is below the guide of the printing table during the printing and is swung up for the intermediate pressure for the purpose of cleaning under the Siebschablone.

Maschinen dieser Art arbeiten zufriedenstellend, können aber den Nachteil nicht verhindern, dass die Siebdruckfarbe zum Teil eintrocknet und das Siebgewebe verstopft. Es ist daher bei Siebdruckeinrichtungen trotz der Anordnung eines zur Siebreinigung verwendeten Zwischendrucktisches notwendig, die Produktion anzuhalten, um das Sieb zu reinigen.Machines of this type work satisfactorily, but can not prevent the disadvantage that the screen printing ink dries in part and clogs the screen cloth. It is therefore necessary in screen printing devices, despite the arrangement of an intermediate printing table used for screen cleaning, to stop production in order to clean the screen.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine solche Reinigung weitgehend automatisch vorzunehmen und zwar, um einen Produktionsausfall zu vermeiden, während des Betriebes. Gleichzeitig damit sollen bessere Arbeitsbedingungen geschaffen und eine Fehlproduktion vermieden werden.The present invention has for its object to perform such a cleaning largely automatically and indeed to avoid production loss during operation. At the same time, it aims to create better working conditions and avoid mis-production.

Zur Lösung dieser Aufgabe wird bei einem Verfahren der eingangs genannten Art vorgesehen, dass vor der Ausführung des Zwischendruckes die Unterseite der Siebschablone mit einem Reinigungsmittel benetzt wird. Durch diese Maßnahme werden auch Farbreste vom Sieb gelöst, die schon eingetrocknet sind und daher durch die Maßnahme eines Zwischendruckes, der durch die Bewegung des Rakelwerkes auf ein Zwischendruckpapier erfolgt, das dann aufgerollt und entfernt wird, nicht von der Siebschablone entfernt hätten werden können.To achieve this object, it is provided in a method of the type mentioned that before the execution of the intermediate pressure, the underside of the screen stencil is wetted with a detergent. By this measure, paint residues are also released from the sieve, which are already dried and therefore by the measure of an intermediate pressure, which takes place by the movement of the squeegee on an intermediate printing paper, which is then rolled up and removed, could not have been removed from the screen template.

In weiterer Ausgestaltung des erfindungsgemäßen Verfahrens erfolgt das Benetzen durch eine in Kontakt mit der Unterseite der Siebschablone gebrachte rotierende Walze oder Bürste, die in ein Reinigungsmittel eintaucht. Durch die Rotation der Walze oder Bürste wird das Reinigungsmittel aus dem Bad herausgefördert und an die Unterseite der Siebschablone gebracht, wo es angetrocknete Farbreste lösen kann, die dann beim Zwischendruck entfernbar sind.In a further embodiment of the method according to the invention, the wetting is carried out by a placed in contact with the underside of the screen template rotating roller or brush, which dips into a cleaning agent. The rotation of the roller or brush, the detergent is conveyed out of the bath and brought to the bottom of the screen template, where it can dissolve dried paint residues, which are then removable at intermediate pressure.

Die Erfindung betrifft auch eine Siebdruckmaschine zur Durchführung des Reinigungsverfahrens, wobei die Siebdruckmaschine mit einer Zwischendruckeinrichtung, mit der eine Papierbahn unter die Siebschablone zum Zweck der Reinigung einführbar ist, ausgerüstet ist. Die neue Siebdruckmaschine ist gekennzeichnet durch eine der Zwischendruckeinrichtung zugeordnete und quer zur Bewegungsrichtung der Zwischendruckenrichtung angeordneten Rotationskörper, der mit einem Reinigungsmittel beschichtbar ist und vor dem Zwischendruck in Kontakt mit der Unterseite der Siebschablone kommt und an dieser entlangführbar ist.The invention also relates to a screen printing machine for carrying out the cleaning method, wherein the screen printing machine is equipped with an intermediate printing device with which a paper web is inserted under the screen template for the purpose of cleaning. The new screen printing machine is characterized by one of the intermediate pressure device associated and arranged transversely to the direction of the intermediate pressure direction of rotation body, which is coatable with a detergent and comes before the intermediate pressure in contact with the underside of the Siebschablone and can be guided along this.

Durch diese Ausgestaltung kann die Reinigung selbsttätig und in der Siebdruckmaschine vorgenommen werden.By this configuration, the cleaning can be done automatically and in the screen printing machine.

In Ausgestaltung der Erfindung kann als Rotationskörper eine Walze vorgesehen werden, die in ein Bad des Reinigungsmittels eintaucht. Dieses Reinigungsmittel kann in Weiterbildung der Erfindung in einem die Walze unten umfassenden und der Form der Walze angepassten Behälter enthalten sein, wobei die Oberfläche der Walze aufgeraut ausgebildet wird, um eine ausreichend dicke Schicht des Reinigungsmittels zu halten und gegen die Siebschablone bringen zu können.In an embodiment of the invention can be provided as a rotating body, a roller which dips into a bath of the detergent. This cleaning agent may be contained in a further development of the invention in a roll comprising the bottom and adapted to the shape of the roll container, wherein the surface of the roll is formed roughened to hold a sufficiently thick layer of the detergent and to bring against the Siebschablone.

In Weiterbildung der Erfindung ist die Walze rotierend angetrieben, und sie greift zu diesem Zweck mit seitlich angeordneten Ritzeln in eine Zahnstange ein, die neben der Siebschablone am Druckwerk angeordnet ist.In a further development of the invention, the roller is driven in rotation, and it engages for this purpose with laterally arranged pinions in a rack, which is arranged next to the screen template on the printing unit.

Die Zwischendruckeinrichtung selbst ist absenkbar und anhebbar und damit an- und abklappbar ausgebildet, wobei eine Steuereinrichtung zur Bestimmung des Reinigungszyklus vorgesehen sein kann, so dass beispielsweise nach jedem zweiten, dritten oder fünften Druck ein Reinigungsdruckvorgang vorgenommen wird.The intermediate pressure device itself can be lowered and raised and thus formed and folded down, wherein a control device may be provided for determining the cleaning cycle, so that, for example, after every second, third or fifth printing, a cleaning printing operation is performed.

In vorteilhafter Weiterbildung ist die Walze und der ihr zugeordnete Behälter, dem das Reinigungsmittel in einfacher Weise im Kreislauf zugeführt wird, an dem der Siebschablone zugewandten Ende einer in Richtung der Rakelbewegung verschiebbar gelagerten Papier-Gegendruckwalze angeordnet.In an advantageous development, the roller and its associated container, to which the cleaning agent is supplied in a simple manner in the circuit, arranged at the screen stencil facing the end of a slidably mounted in the direction of blade movement paper counter-pressure roller.

Um die Möglichkeit des Anhebens und Absenkens für die Reinigungsmittelwalze zu verwirklichen, kann die Walze mit dem Behälter zweckmäßig auf einem Schwenkhebelpaar angeordnet sein, das von pneumatischen Zylindern so beaufschlagbar, dass die seitlichen Ritzel der Walze in die Zahnstange eingreifen, die fest neben der Siebschablone verläuft. In an sich bekannter Weise kann schließlich die Zwischendruckwalze mit Papier versehen und mindestens um die Länge der Siebschablone verfahrbar angeordnet werden, so dass vor dem Zwischendruck die gesamte Unterseite der Siebschablone mit einem Reinigungsmittel benetzbar ist. In der Praxis genügt die Benetzung im Druckbereich.In order to realize the possibility of raising and lowering of the detergent roller, the roller with the container may be conveniently arranged on a pair of pivot levers which acted upon by pneumatic cylinders so that the lateral pinion of the roller engage in the rack, which runs fixed next to the Siebschablone , In known manner, finally, the intermediate pressure roller can be provided with paper and arranged to be movable at least by the length of the screen template, so that before the intermediate pressure, the entire bottom of the screen template with a cleaning agent is wettable. In practice, the wetting in the pressure range is sufficient.

Anstelle der Zwischendruckwalze mit einer sich abwickelnden Papierbahn kann auch ein endloses Bandmaterial zur Aufnahme des Zwischendruckes vorgesehen sein, oder auch eine Druckträgerwalze. In beiden Varianten kann für eine kontinuierliche Reinigung der Endlosbahn oder der Druckträgerwalze gesorgt werden. Verbrauchsmaterial in der Form von Papier fällt dann nicht an.Instead of the intermediate pressure roller with a unwound paper web can also be an endless strip material for receiving the intermediate pressure may be provided, or even a print carrier roll. In both variants, a continuous cleaning of the endless web or the print carrier roll can be ensured. Consumables in the form of paper then do not accrue.

Die Erfindung ist in der Zeichnung anhand eines Ausführungsbeispieles dargestellt und wird im folgenden erläutert. Es zeigen:

Fig.1
die schematische perspektivische Darstellung einer Zwischendruckeinrichtung nach der Erfindung und deren Zuordnung zur Siebschablone einer Siebdruckmaschine, deren Drucktisch und Rakelwerk nicht gezeigt sind,
Fig. 2
eine vergrößert Darstellung des der Siebschablone zugewandten Endes der Zwischendruckeinrichtung nach Fig. 1, jedoch in einer Stellung, in der die Zwischendruckeinrichtung im Begriffe ist zur Durchführung eines Zwischendruckes unter die Siebschablone gefahren zu werden und
Fig. 3
die Darstellung ähnlich Fig. 1, jedoch während des Benetzens der Siebschablonenunterseite mit einem Reinigungsmittel.
The invention is illustrated in the drawing with reference to an embodiment and will be explained below. Show it:
Fig.1
the schematic perspective view of an intermediate printing device according to the invention and its assignment to the screen template of a screen printing machine whose printing table and squeegee unit are not shown,
Fig. 2
an enlarged representation of the screen template facing the end of the intermediate pressure device after Fig. 1 However, in a position in which the intermediate pressure device is about to be driven to perform an intermediate pressure under the screen template and
Fig. 3
the presentation is similar Fig. 1 but during wetting of the stencil base with a detergent.

In Fig. 1 ist eine Zwischendruckeinrichtung 1 gezeigt, die einer nicht dargestellten Siebdruckmaschine zugeordnet ist. Von der Siebdruckmaschine ist die in einem Rahmen gehaltene Siebschablone 2 dargestellt, die in bekannter Weise zwischen einer unter sie fahrbaren Zwischendruckwalze und einem über ihr liegenden Rakelwerk angeordnet ist. Fest mit der Siebdruckmaschine verbunden ist außerdem eine seitlich und parallel zur Längsrichtung der Siebschablone 2 verlaufend angeordnete Zahnstange 3, auf die später noch eingegangen werden wird.In Fig. 1 an intermediate printing device 1 is shown, which is associated with a screen printing machine, not shown. From the screen printing machine held in a frame screen 2 is shown, which is arranged in a known manner between a mobile under them intermediate pressure roller and a squeegee unit lying above it. Fixedly connected to the screen printing machine is also a side and parallel to the longitudinal direction of the screen template 2 extending arranged rack 3, which will be discussed later.

Die Zwischendruckeinrichtung 1 ist innerhalb eines Traggestelles 4 mit einer Papierbahn 5 ausgerüstet, die von einer Rolle abziehbar und so geführt ist, dass sie über eine Zwischendruckwalze 7 und unter dieser wieder zurück zu einer zweiten Rolle geführt werden kann. Die Papierbahn 5 ist dabei innerhalb des Traggestelles 4 so geführt, dass sie eine Hin- und Herbewegung der Zwischendruckwalze 7 in Richtung der Pfeile 8 mitmachen kann.The intermediate printing device 1 is equipped within a support frame 4 with a paper web 5, which is removable from a roll and guided so that it can be performed via an intermediate pressure roller 7 and below this again back to a second roller. The paper web 5 is guided within the support frame 4 so that they can join a reciprocating motion of the intermediate pressure roller 7 in the direction of the arrows 8.

Vor der Zwischendruckwalze 7 ist eine quer zur Bewegungsbahn der Zwischendruckwalze 7 verlaufende Walze 9 angeordnet, die, wie aus der vergrößerten Darstellung nach Fig. 2 hervorgeht, in einen sie weitgehend umgebenden Behälter 10 eintaucht, der mit einem flüssigen Reinigungsmittel gefüllt ist. Es handelt sich dabei um ein Reinigungsmittel, das in der Lage ist, die beim Siebdruck verwendete Farbe zu lösen.Before the intermediate pressure roller 7, a transverse to the movement path of the intermediate pressure roller 7 extending roller 9 is arranged, which, as shown in the enlarged view Fig. 2 emerges, immersed in a largely surrounding container 10 which is filled with a liquid detergent. It is a cleaning agent that is able to dissolve the color used in screen printing.

Der Behälter 10 und die in ihm geführte Walze 9 sind auf einem Quersteg 11 befestigt, der am rechten Ende von je einem um die Achse 12 schwenkbaren Doppelhebel 13 angebracht ist. Der andere Hebelarm 13a des Doppelhebels steht mit dem Stößel 14 eines pneumatischen Zylinders 15 in Kontakt, der es ermöglicht, den Doppelhebel 13 aus der in Fig. 1 gezeigten Lage nach oben und unten zu schwenken.The container 10 and guided in it roller 9 are mounted on a crossbar 11 which is mounted at the right end of a respective pivotable about the axis 12 double lever 13. The other lever arm 13a of the double lever is in contact with the plunger 14 of a pneumatic cylinder 15, which allows the double lever 13 from the in Fig. 1 shown position to swing up and down.

Die Walze 9 ist an einem Ende, an dem sie über Lagerzapfen in je einer Stirnwand des Behälters 10 gelagert ist, mit einem Ritzel 16 versehen, das bei Betätigung des Zylinders 15 und bei einer Verschwenkung des Doppelhebels 13 im Gegenuhrzeigersinn in Eingriff mit der Zahnstange 3 gebracht wird, wie das in Fig. 2 auch gezeigt ist.The roller 9 is provided at one end, on which it is mounted on trunnions in each end wall of the container 10, with a pinion 16 which, upon actuation of the cylinder 15 and upon pivoting of the double lever 13 in the counterclockwise direction in engagement with the rack. 3 is brought, like that in Fig. 2 also shown.

Die aus dem Traggestell 4 herausragende Zwischendruckwalze 7 weist zum einen eine Lagerung auf und zum anderen zwei seitlich abstehende Laschen 17, die in Wirkverbindung mit dem nicht gezeigten Rakelwerk bzw. mit dessen Antrieb gebracht werden können.The protruding from the support frame 4 intermediate pressure roller 7 has on the one hand a storage and on the other two laterally projecting tabs 17 which can be brought into operative connection with the squeegee unit, not shown, or with its drive.

Die Arbeitsweise der gezeigten Zwischendruckeinrichtung ist folgende:The operation of the intermediate pressure device shown is the following:

Nach einer vorbestimmten Anzahl von Druckvorgängen in der Siebdruckmaschine wird über eine entsprechende Steuereinrichtung ein Impuls abgegeben, der dazu führt, dass beim Rücklauf des Rakelwerkes die Zwischendruckwalze 7, wie in Fig. 3 gezeigt, unter die Siebschablone der Siebdruckmaschine gefahren wird. Vorher ist durch den Impuls der Doppelhebel 13 im Gegenuhrzeigersinn vom Zylinder 15 geschwenkt worden, so dass die Reinigungsmittel-Walze 9 mit ihren Ritzeln 16 in die fest neben der Siebschablone 2 angeordnete Zahnstange eingreift. Bei der Bewegung der Zwischendruckwalze in Richtung des Pfeiles 18 (Fig. 3) wird daher die Walze 9 im Gegenuhrzeigersinn rotierend an der Siebschablone 2 so vorbeigeführt, dass sie in Kontakt mit der Unterseite der Siebschablone 2 kommt. Die Walze 9 benetzt daher beim Entlangfahren an der Unterseite der Siebschablone 2 dieselbe mit Reinigungsmittel, das durch die Rotation der Walze 9 aus dem Behälter 10 gefördert wird. Das Reinigungsmittel wird im übrigen in nicht näher gezeigter Weise im Kreislauf durch den Behälter 10 geführt, so dass das Niveau des Reinigungsmittels im Behälter 10 stets gleichbleibend gehalten werden kann. Durch die Benetzung der Siebschablone mit dem Reinigungsmittel werden Farbreste von der Siebschablone gelöst, auch wenn die Farbe teilweise schon eingetrocknet sein sollte. Die Walze 9 kann dabei zur Benetzung der Siebschablonenunterseite einmal oder auch mehrmals an der Unterseite entlanggeführt werden, so dass die notwendige Benetzung in jedem Fall stattfindet. Die Zwischendruckwalze 7 wird zu diesem Zweck entsprechend oft vom Antrieb des Rakelwerkes hin- und herbewegt.After a predetermined number of printing operations in the screen printing machine, a pulse is delivered via a corresponding control device, which leads to the fact that during the return of the squeegee unit, the intermediate pressure roller 7, as in Fig. 3 shown, is driven under the screen stencil of the screen printing machine. Previously, by the pulse of the double lever 13 has been pivoted counterclockwise by the cylinder 15, so that the detergent roller 9 engages with its pinions 16 in the fixedly arranged next to the screen template 2 rack. During the movement of the intermediate pressure roller in the direction of the arrow 18 (FIG. Fig. 3 ), therefore, the roller 9 is guided in a counterclockwise rotating manner on the screen template 2 so that it comes into contact with the underside of the screen template 2. The roller 9 therefore wets the same with cleaning agent, which is conveyed by the rotation of the roller 9 from the container 10 when traveling along the underside of the screen template 2. The detergent is otherwise performed in a manner not shown in detail in the circuit through the container 10, so that the level of the detergent in the container 10 can always be kept constant. By wetting the screen stencil with the detergent paint residues are solved by the stencil, even if the ink should be partially dried. The roller 9 can thereby be guided once or even several times at the bottom for wetting the Siebschablonenunterseite, so that the necessary wetting takes place in each case. The intermediate pressure roller 7 is correspondingly often reciprocated by the drive of the doctor blade mechanism for this purpose.

Ist die Benetzung vollständig und lange genug erfolgt, dann fährt die Zwischendruckwalze 7 mit der Papierbahn 5 vollständig unter der Siebschablone 2 entlang, und nach dem Absenken des Rakelwerkes erfolgt das Ausdrucken der restlichen Farbe auf die Papierbahn 5, die dann entsprechend abgezogen und als Abfall aufgewickelt wird. Die Siebschablone 2 ist auch von angetrockneten Farbresten gereinigt.If the wetting is complete and long enough, then the intermediate pressure roller 7 moves along with the paper web 5 completely under the screen template 2, and after lowering the squeegee printing the printing of the remaining color on the paper web 5, which is then deducted accordingly and wound up as waste becomes. The stencil 2 is also cleaned of dried paint residues.

Anschließend wird wieder der normale Druckbetrieb aufgenommen. Durch entsprechende Steuerung ist es möglich, nach einer bestimmten Anzahl von Drucken jeweils wieder eine Reinigung durchzuführen, wobei die Benetzung der Siebschablonenunterseite durch ein einmaliges Entlangführen der Walze 9 oder auch durch mehrmaliges Hin- und Herführen der Walze an der Unterseite der Siebschablone 2 jeweils nach einer vorbestimmten Anzahl von Drucken selbsttätig erfolgen kann.Subsequently, the normal printing operation is resumed. By appropriate control, it is possible to perform after a certain number of prints each again a cleaning, wherein the wetting of Siebschablonenunterseite by a unique Entlangführen the roller 9 or by repeated reciprocating the roller on the underside of the screen template 2 each after a predetermined number of prints can be done automatically.

Ist der Benetzungsvorgang der Siebschablonenunterseite beendet, so wird das Ritzel 16 durch Schwenkung des Doppelhebels 13 im Uhrzeigersinn wieder von den Zahnstange 3 entfernt, so dass für den Reinigungsdruck selbst und für die entsprechende Rückbewegung der Zwischendruckwalze 7 keine Benetzung der Siebschablone 2 mehr stattfindet.If the wetting process of Siebschablonenunterseite finished, the pinion 16 is removed by pivoting the double lever 13 clockwise back from the rack 3, so that no wetting of the screen template 2 takes place for the cleaning pressure itself and for the corresponding return movement of the intermediate pressure roller.

Die Erfindung bietet eine sehr einfache Möglichkeit der Reinigung einer Siebschablone 2 einer Siebdruckmaschine, die selbsttätig erfolgt. Die Einrichtung ist weitgehend wartungsfrei und erlaubt eine Siebreinigung ohne nennenswerten Produktionsstillstand.The invention provides a very simple way of cleaning a screen stencil 2 of a screen printing machine, which takes place automatically. The device is largely maintenance-free and allows a screen cleaning without significant production downtime.

Claims (18)

  1. Method for cleaning the screen stencil (2) of a silk screen printing device, in which a paper web (5) for intermediate printing is moved underneath the screen stencil and is printed on by a squeegee passing over said stencil,
    characterized in that
    the underside of the screen stencil (2) is wetted with a cleaning agent before intermediate printing is performed.
  2. Method according to Claim 1, characterized in that wetting is achieved by a rotating roller (9) or brush brought into contact with the underside of the screen stencil (2) and immersed in cleaning agent.
  3. Intermediate printing device for a silk screen printing machine to perform the method according to Claim 1, having a paper web (5) and an intermediate printing roller (7), where the paper web (5) can be inserted underneath the screen stencil (2) for the purpose of cleaning the latter, characterized by a rotation element (9) assigned to the intermediate printing device (1), and arranged transversely to the movement direction (8) of the intermediate printing device (1), which can be coated with a cleaning agent and guided along the screen stencil (2) prior to intermediate printing in contact with the underside of said screen stencil (2).
  4. Intermediate printing device according to Claim 3, characterized in that the rotation element is a roller (9) immersed in a bath of the cleaning agent.
  5. Intermediate printing device according to Claim 4, characterized in that the cleaning agent is received in a container (10) surrounding the bottom of the roller (9) and adapted to the shape of said roller.
  6. Intermediate printing device according to Claim 5, characterized in that the cleaning agent is supplied to the container (10) in a circular flow.
  7. Intermediate printing device according to Claim 4, characterized in that the surface of the roller (9) is designed roughened.
  8. Intermediate printing device according to Claim 4, characterized in that the roller (9) is provided with a laterally arranged pinion (16) engaging in a rack (3) fixed on the master frame of the silk screen printing machine next to the screen stencil (2).
  9. Intermediate printing device according to Claim 3, characterized in that the rotation element (9) is designed to be lowered and lifted.
  10. Intermediate printing device according to Claim 3, characterized in that a control device is provided for determining the cleaning cycle.
  11. Intermediate printing device according to Claim 4, characterized in that the roller (9) and the cleaning agent container (10) assigned to it are arranged on that end facing the screen stencil (2) of an intermediate printing roller (7) mounted movable in the direction of the squeegee movement.
  12. Intermediate printing device according to Claim 11, characterized in that the roller (9) with the container (10) is arranged on a pair of swivel levers (13).
  13. Intermediate printing device according to Claims 8 and 12, characterized in that the pair of swivel levers (13) can be acted upon by pneumatic cylinders (15) such that the pinion (16) engages in the rack (3).
  14. Intermediate printing device according to Claim 3, characterized in that the intermediate printing roller (7) is provided with a paper web (5) borne by rollers and is arranged movable by at least the length of the screen stencil (2).
  15. Intermediate printing device according to Claim 14, characterized in that the paper web (5) is designed as a continuous strip for receiving ink and cleaner.
  16. Intermediate printing device according to Claim 15, characterized in that the continuous strip material is freed of ink by cleaning agent during its circulation movement and when dry is available for re-printing.
  17. Intermediate printing device according to Claim 16, characterized in that the cleaning of the continuous strip material is achieved with cleaner in a circular flow and using brushes, removal squeegees and spray nozzles.
  18. Intermediate printing device according to Claim 3, characterized in that intermediate printing for cleaning the screen stencil is performed with a print substrate roller that rolls out underneath the screen and is automatically cleaned according to Claim 17.
EP03772227A 2002-11-27 2003-10-16 Method for cleaning the screen stencil of a silk-screen printing device and silk-screen printing machine for said method Expired - Lifetime EP1565314B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256326 2002-11-27
DE10256326A DE10256326A1 (en) 2002-11-27 2002-11-27 Process for cleaning the screen template of a screen printing device and screen printing machine for carrying out the method
PCT/EP2003/011475 WO2004048098A1 (en) 2002-11-27 2003-10-16 Method for cleaning the screen stencil of a silk-screen printing device and silk-screen printing machine for said method

Publications (2)

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EP1565314A1 EP1565314A1 (en) 2005-08-24
EP1565314B1 true EP1565314B1 (en) 2011-11-23

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Application Number Title Priority Date Filing Date
EP03772227A Expired - Lifetime EP1565314B1 (en) 2002-11-27 2003-10-16 Method for cleaning the screen stencil of a silk-screen printing device and silk-screen printing machine for said method

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US (1) US7434510B2 (en)
EP (1) EP1565314B1 (en)
AT (1) ATE534516T1 (en)
AU (1) AU2003280385A1 (en)
DE (1) DE10256326A1 (en)
PL (1) PL377001A1 (en)
WO (1) WO2004048098A1 (en)

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US8733245B2 (en) * 2010-02-09 2014-05-27 Samsung Techwin Co., Ltd. Screen printer
CN104085187B (en) * 2014-07-09 2016-06-01 湖州石淙印染有限公司 The washing unit of a kind of PLATE SCREAM PRINTING net version
CN105689309A (en) * 2016-03-03 2016-06-22 厦门市稻贞科技有限公司 High-pressure cleaning device for screen frame washing and working method for high-pressure cleaning device
DE112019007039T5 (en) * 2019-03-20 2022-01-05 Panasonic intellectual property Management co., Ltd Screen printing device and screen printing process
CN113370654B (en) * 2021-06-29 2023-06-27 晶澳太阳能有限公司 Solar cell printing equipment
CN113246595B (en) * 2021-07-15 2021-09-21 兴晔新材料(南通)有限公司 Textile fabric printing machine and printing process thereof

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Also Published As

Publication number Publication date
EP1565314A1 (en) 2005-08-24
ATE534516T1 (en) 2011-12-15
DE10256326A1 (en) 2004-06-17
PL377001A1 (en) 2006-01-23
AU2003280385A1 (en) 2004-06-18
AU2003280385A8 (en) 2004-06-18
WO2004048098A1 (en) 2004-06-10
US20060180037A1 (en) 2006-08-17
WO2004048098A8 (en) 2004-11-18
US7434510B2 (en) 2008-10-14

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