EP1210230A1 - Printing device or printing method - Google Patents

Printing device or printing method

Info

Publication number
EP1210230A1
EP1210230A1 EP00956429A EP00956429A EP1210230A1 EP 1210230 A1 EP1210230 A1 EP 1210230A1 EP 00956429 A EP00956429 A EP 00956429A EP 00956429 A EP00956429 A EP 00956429A EP 1210230 A1 EP1210230 A1 EP 1210230A1
Authority
EP
European Patent Office
Prior art keywords
printing
stamp
transfer
expansion
workpiece
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.)
Granted
Application number
EP00956429A
Other languages
German (de)
French (fr)
Other versions
EP1210230B1 (en
Inventor
Michael Zimmer
Bernd Schultheis
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.)
M. ZIMMER
Schott AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke 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 Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Publication of EP1210230A1 publication Critical patent/EP1210230A1/en
Application granted granted Critical
Publication of EP1210230B1 publication Critical patent/EP1210230B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0895—Machines for printing on curved surfaces not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/40—Printing on bodies of particular shapes, e.g. golf balls, candles, wine corks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/03—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/40—Screen printing
    • B41P2200/41—Offset printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • the invention relates to a printing device with at least one transfer roller which can be coated on its roller surface at least partially with coating material, for example a toner, the coating material being able to be applied directly or indirectly to a carrier surface of a transfer element.
  • coating material for example a toner
  • the invention also relates to a printing method in which a coating is applied to a workpiece with the aid of a transmission element.
  • BESTATIGUNGSKOPIE be moistened.
  • the paper which serves as a transfer element, can then be peeled off, with the rubber-ariaabi layer and the colored coating applied thereon adhering to the workpiece.
  • the transmission element has an expansion element which forms the support surface and that the support surface is expandable by means of an expansion device.
  • 3D-shaped glass ceramic cooktops with, for example, lower-lying cooking areas or deformed higher-level operating areas, as well as curved glass-ceramic fireplace viewing panels, 3D-shaped ceramic parts, such as tableware, such as Print on plates and bowls and 3D-shaped plastic surfaces.
  • the transmission element is designed as an endlessly circulating band which is equipped with expansion elements at least in regions along its longitudinal extension or which is itself designed as an expansion element.
  • the endless belt enables a continuous, economical coating of workpieces. It can in particular be provided that the transmission element is designed as a rubber band.
  • the stamp surface of the stamp is formed by an elastic, resilient material.
  • the support surface of the expansion element is provided with a silicone coating or is formed by a silicone rubber. Such a surface design prevents coating material from sticking to the support surface after the printing process.
  • the printing method can be designed in such a way that the transfer element rotating as an endless belt is guided past the stretching device and that the endless belt is stopped during the stretching of the carrier surface and the execution of the printing process , At the same time as the endless belt is clocked, the conveyor belt must also be stopped.
  • a continuous manufacturing process can be achieved if it is provided that the transmission element rotating as an endless belt can be guided past the stretching device, that during the stretching of the support surface and the Carrying out the printing process, the stretching device and at the same time the workpiece are carried along with the endless belt.
  • a preferred embodiment variant of the invention is characterized in that the stretching device is assigned a corona which effects or supports the transfer of the coating material to the printing surface of the workpiece to be printed.
  • the drawing shows a schematic representation of a printing device to which workpieces 11 are continuously fed by a transport device 10.
  • the workpieces 11 are in the present case in the form of plates which have an upwardly facing pressure surface 12.
  • This printing area 12 is to be printed with the printing device described in more detail below.
  • the workpieces 11 can also be other workpieces made of glass, glass ceramic or plastic, which have already been described above.
  • the printing device has a first transfer roller 24 which can be electrostatically charged in a known manner and then coated with toner particles 27 of a toner 26.
  • the toner 26 is held in a storage container 25.
  • black-colored toner 26 is stored in the storage container 25.
  • three further transfer rollers 28 are provided. Further transfer containers 29 are assigned to these transfer rollers 28. Colored toners are filled in the individual storage containers 29.
  • the transfer rollers 28 can be coated with this colored toner.
  • a transfer device 20 is arranged below the transfer rollers 24 and 28.
  • the transmission device 20 has an endless belt designed as an expansion element 22. In the present case, this endless belt 22 is designed as a rubber belt.
  • the rubber band 22 is deflected via two transport rollers 21 which are held at a distance from one another.
  • the left of the two transport rollers 21 is driven by a motor, not shown in the drawing. Accordingly, the rubber band forms an upper run 22.1 and a lower run 22.1.
  • a tensioning unit 40 is also assigned to the left transport roller 21. By means of this clamping unit 40, the
  • Rubber band 22 are biased.
  • the right transport roller 21 is assigned a cleaning device 23, the operation of which will be explained below.
  • a stretching device 30 is arranged between the two transport rollers 21 and between the run-in and run-out runs 22.2 and 22.1.
  • the stretching device 30 has a drive 31 which moves a plunger 32 linearly.
  • the plunger 32 carries a stamp 33 at its end facing away from the drive 31.
  • the stamp 33 has a stamp surface 34 facing downwards.
  • the stamp surface 34 is designed to be adapted to the pressure surface 12 of the workpiece 11 and is curved accordingly.
  • the transfer roller 24 is coated with the toner particles 27.
  • the transfer rollers 28 are coated with colored toner particles.
  • the transfer rollers 24 and 28 rotate clockwise.
  • the run-up strand 22.2 is passed from right to left past the transfer rollers 24 and 28. guided.
  • the rotational speed of the rubber band 22 and the surface of the transfer rollers 24 and 28 are coordinated.
  • Corones 35 are used to transfer the color particles 27.
  • the ink particles 27 are transported on the rubber band 22 past the left transport roller 21 and then reach the area of the run-off strand 22.1.
  • the transport roller 21 is stopped. Then the punch 33 can be moved in the direction of the workpieces 11 by means of the drive 31.
  • the elastic band 22 expands and lies against the stamp surface 34.
  • the stamp 33 then presses the rubber band 22 onto the pressure surface 12.
  • the stamp 33 can at the same time also be provided with a heating device which fixes the ink particles 27 on the workpiece surface.
  • the stamp 33 is moved back into its upper starting position.
  • the rubber band 22 can then be rotated further, for which purpose the transport roller 21 is rotated.
  • the transport device 10 also moves and places the next workpiece 11 under the stretching device 30.
  • the workpiece 11 provided with the pressure 13 is transported out of the effective range of the printing device.
  • the cleaning device 23 is used.
  • the cleaning device 23 can be, for example, a heated roller that is on the rubber band 22 rolls.
  • the heated roller is in turn associated with a brush that removes the toner particles 27.
  • the rubber band 22 can also be provided with a silicone coating on its carrier surface. It is also conceivable to apply a layer of silicone rubber to the rubber band 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

A printing method using at least one transfer roller, whose roller surface is charged with a coating material, for example a toner. The coating material is directly or indirectly transferred from the transfer roller to a support surface of a transfer element, before being transferred at least partially from the transfer element to a workpiece to be coated. According to this invention, the transfer element has a stretching element which forms the support surface and the support surface is stretched in the direction of the surface by a stretching device. This ensures that this method can also be used to easily coat 3-dimensional surfaces which are curved in space.

Description

Druckvorrichtung bzw. DruckverfahrenPrinting device or printing method
Die Erfindung betrifft eine Druckvorrichtung mit wenigstens einer Ubertragungswalze, die auf ihrer Walzenoberfläche zumindest teilweise mit Beschichtungsmaterial, beispielsweise einem Toner beaufschlagbar ist, wobei das Beschichtungsmaterial mittelbar oder unmittelbar auf eine Trägerfläche eines Übertragungselementes aufbringbar ist.The invention relates to a printing device with at least one transfer roller which can be coated on its roller surface at least partially with coating material, for example a toner, the coating material being able to be applied directly or indirectly to a carrier surface of a transfer element.
Die Erfindung betrifft auch ein Druckverfahren, bei dem unter Zuhilfenahme eines Übertragungselementes eine Beschichtung auf ein Werkstück aufgebracht wird.The invention also relates to a printing method in which a coating is applied to a workpiece with the aid of a transmission element.
Aus der EP 0 647 885 A1 ist ein Beschichtungsverfahren bekannt, das zum Bedrucken von Keramik- und Glaserzeugnissen eingesetzt wird. Hierbei kommt als Beschichtungsmaterial ein Toner zum Einsatz, dessen Tonerteilchen einen Pigmentkern aufweisen. Die aus keramischen Pigmenten und glasigem Fluß bestehenden sind von einer Bindemittelharzhülle umgeben. An die Bindemittelharzhülle sind Ladungssteuerungsmittel angekoppelt. Die Tonerteilchen werden unter Zuhilfenahme eines elektrostatischen Kopierverfahrens auf ein mit Gummi-Arabikum beschichtetes Papier aufgebracht. Zur Fixierung wird auf das beschichtete Papier ein Klarlack aufgetragen. Anschließend kann das Papier auf das zu beschichtende Werkstück (ein Keramik- oder Glaserzeugnis) aufgelegt undA coating method is known from EP 0 647 885 A1 which is used for printing on ceramic and glass products. Here, a toner is used as the coating material, the toner particles of which have a pigment core. The ceramic pigments and glassy flow are surrounded by a binder resin shell. Charge control agents are coupled to the binder resin shell. The toner particles are applied to paper coated with gum arabic using an electrostatic copying process. A clear varnish is applied to the coated paper for fixation. The paper can then be placed on the workpiece to be coated (a ceramic or glass product)
BESTATIGUNGSKOPIE befeuchtet werden. Das Papier, das als Übertragungselement dient, kann dann abgezogen werden, wobei die Gummi-Ariabikumschicht und die darauf aufgebrachte farbige Beschichtung auf dem Werkstück anhaftet.BESTATIGUNGSKOPIE be moistened. The paper, which serves as a transfer element, can then be peeled off, with the rubber-ariaabi layer and the colored coating applied thereon adhering to the workpiece.
Abschließend erfolgt ein Brennvorgang, wobei die keramische Farbe mit der Oberfläche des Keramik- oder Glaserzeugnisses verschmelzen. Mit diesem Verfahren können hochwertige und kratzbeständige Beschichtungen erzeugt werden.Finally, there is a firing process, the ceramic color fusing with the surface of the ceramic or glass product. With this process, high-quality and scratch-resistant coatings can be produced.
Weiterhin ist aus der EP-OS 0 834 784 und der EP-OS 0 072 778 jeweils eine Druckvorrichtung bekannt, die eine bandartige Übertragungsvorrichtung aufweist, die aus einem flexiblen Band mit einer Silikonbeschichtung besteht. Im Bereich der Übertragung des Toners zum Werkstück wird dieses Band mittels einer Walze an das Werkstück angedrückt, ist eine Beschichtung von 2D-Flächen allerdings nicht möglich.Furthermore, a printing device is known from EP-OS 0 834 784 and EP-OS 0 072 778, which has a band-like transmission device, which consists of a flexible band with a silicone coating. In the area of the transfer of the toner to the workpiece, this tape is pressed onto the workpiece by means of a roller, but coating 2D surfaces is not possible.
Es ist Aufgabe der Erfindung, eine Beschichtungsvorrichtung, bzw. ein Beschichtungsverfahren zu schaffen, mit dem insbesondere auch drei-dimensional im Raum gewöblte Flächen auf einfache Weise beschichtet werden können.It is an object of the invention to provide a coating device or a coating method with which, in particular, three-dimensionally curved surfaces can be coated in a simple manner.
Diese Aufgabe wird dadurch gelöst, dass das Übertragungselement ein Dehnelement aufweist, das die Trägerfläche bildet, und dass die Trägerfläche mittels einer Dehnvorrichtung dehnbar ist.This object is achieved in that the transmission element has an expansion element which forms the support surface and that the support surface is expandable by means of an expansion device.
Das Dehnelement kann mittels der Dehnvorrichtung derart verformt werden, dass es sich an die Kontur der zu bedruckenden Fläche anpaßt. Auf diese Weise lassen sich auch komplexe Verläufe von dreidimensional ausgeformten Fachen auf einfache Weise bedrucken. Beispielsweise eignet sich das Druckverfahren bzw. die Druckvorrichtung zum Bedrucken von, aus der Ebene heraus verformten Glas-, Glaskeramik-, Keramikoder Kunststoff- Werkstücken. Insbesondere 3D-verformte Teile aus oben genannten Werkstoffen lassen sich derzeit nicht ohne Weiteres mit den bisher üblichen Siebdrucktechniken kostengünstig bedrucken. Mit dem Druckverfahren bzw. der Druckvorrichtung lassen sich 3D-verformte Glasscheiben, z. B. gewölbte Backofenfrontscheiben, Glas-Bedienpanel, Möbelglastüren oder gewölbtes Architekturglas, 3D-verformte Glaskeramik-Kochflächen mit beispielweise tieferliegenden Kochbereichen oder aus der Ebene heraus verformte, höher liegende Bedienbereiche, sowie gewölbte Glaskeramik-Kaminsichtscheiben, 3D- verformte Keramikteile, beispielsweise Geschirrteile, wie Teller und Schüsseln und 3D-verformte Kunststoffoberflächen bedrucken.The expansion element can be deformed by means of the expansion device in such a way that it adapts to the contour of the surface to be printed. In this way, even complex courses of three-dimensionally shaped compartments can be printed in a simple manner. For example, the printing process or the printing device is suitable for printing on glass, glass ceramic, ceramic or plastic workpieces deformed out of the plane. In particular, 3D-deformed parts made from the above-mentioned materials cannot currently be easily printed inexpensively using the screen printing techniques previously used. With the printing process or the printing device, 3D-deformed glass panes, e.g. B. curved oven front panes, glass control panel, furniture glass doors or curved architectural glass, 3D-shaped glass ceramic cooktops with, for example, lower-lying cooking areas or deformed higher-level operating areas, as well as curved glass-ceramic fireplace viewing panels, 3D-shaped ceramic parts, such as tableware, such as Print on plates and bowls and 3D-shaped plastic surfaces.
Gemäß einer bevorzugten Ausgestaltungsvariante der Erfindung ist es vorgesehen, dass das Übertragungselement als endlos umlaufendes Band ausge-bildet ist, das entlang seiner Längserstreckung zumindest bereichsweise mit Dehnelementen bestückt ist oder das selbst als Dehnelement ausgebildet ist.According to a preferred embodiment variant of the invention, it is provided that the transmission element is designed as an endlessly circulating band which is equipped with expansion elements at least in regions along its longitudinal extension or which is itself designed as an expansion element.
Das Endlosband ermöglicht eine fortlaufende, wirtschaftliche Beschichtung von Werkstücken. Hierbei kann es insbesondere vorgesehen sein, dass das Ubertragungselement als Gummiband ausgebildet ist.The endless belt enables a continuous, economical coating of workpieces. It can in particular be provided that the transmission element is designed as a rubber band.
Die Druckvorrichtung kann beispielsweise dergestalt sein, dass die Dehnvor- richtung einen Stempel aufweist, dass der Stempel eine Stempelfläche aufweist, die an die zu bedruckende Druckfläche des Werkstückes angepaßt ausgebildet ist, und dass die Trägerfläche des Dehnelementes aus ihrer gestreckten Ausgangslage mittels des Stempels auf die Druckfläche aufpressbar ist. Hierbei dehnt der Stempel das Dehnelement. Es ist jedoch auch denkbar, dass die Trägerfläche des Dehnelementes unter Zuhilfenahme von Druckluft oder unter Vakuumeinfluss auf das Werkstück aufgedrückt wird.The printing device can, for example, be designed in such a way that the stretching device has a stamp, the stamp has a stamping surface which is adapted to the printing surface of the workpiece to be printed, and that the carrier surface of the stretching element is brought out of its extended starting position by means of the stamp on the Printing area can be pressed on. Here, the stamp stretches the expansion element. However, it is also conceivable that the carrier surface of the Expansion element is pressed onto the workpiece with the aid of compressed air or under the influence of vacuum.
Um eine Beschädigung von empfindlichen Werkstücken, insbesondere von sprödbrüchigen Glas-, Glaskeramik- oder Keramik-Werkstücken während des Druckvorgangs zu verhindern, kann es vorgesehen sein, dass die Stempelfläche des Stempels von einem elastischen, nachgiebigen Material gebildet ist.In order to prevent damage to sensitive workpieces, in particular brittle glass, glass ceramic or ceramic workpieces, during the printing process, it can be provided that the stamp surface of the stamp is formed by an elastic, resilient material.
Damit zwischen zwei Druckvorgängen kein Beschichtungsmaterial verschleppt wird, ist es vorgesehen, dass dem Übertragungselement eine Reinigungsvorrichtung zugeordnet ist, mittels der die Trägerfläche des Dehnelementes nach Beendigung des Druckvorgangs reinigbar ist.So that no coating material is carried over between two printing processes, it is provided that the transmission element is assigned a cleaning device by means of which the carrier surface of the expansion element can be cleaned after the printing process has ended.
Denkbar ist es auch, dass die Trägerfläche des Dehnelementes mit einer Silikonbeschichtung versehen ist oder von einem Silikongummi gebildet ist. Eine solche Oberflächengestaltung verhindert, dass nach dem Druckvorgang Beschichtungsmaterial an der Trägerfläche haften bleibt.It is also conceivable that the support surface of the expansion element is provided with a silicone coating or is formed by a silicone rubber. Such a surface design prevents coating material from sticking to the support surface after the printing process.
Wenn der Druckvorrichtung fortlaufend, beispielsweise von einem Förderband, Werkstücke zugeführt werden, dann kann das Druckverfahren derart konzipiert sein, dass das als Endlosband umlaufende Übertragungselement an der Dehnvorrichtung vorbeigeführt wird, und dass das Endlosband während der Dehnung der Trägerfläche und der Durchführung des Druckvorganges angehalten wird. Gleichzeitig mit der Taktung des Endlosbandes muß auch das Förderband angehalten werden.If workpieces are fed continuously to the printing device, for example from a conveyor belt, then the printing method can be designed in such a way that the transfer element rotating as an endless belt is guided past the stretching device and that the endless belt is stopped during the stretching of the carrier surface and the execution of the printing process , At the same time as the endless belt is clocked, the conveyor belt must also be stopped.
Ein kontinuierlicher Fertigungsprozeß läßt sich dann erreichen, wenn vorgesehen ist, dass das als Endlosband umlaufende Übertragungselement an der Dehn- vorichtung vorbeiführbar ist, dass während der Dehnung der Trägerfläche und der Durchführung des Druckvorganges die Dehnvorrichtung und gleichzeitig das Werkstück mit dem Endlosband mitgeführt werden.A continuous manufacturing process can be achieved if it is provided that the transmission element rotating as an endless belt can be guided past the stretching device, that during the stretching of the support surface and the Carrying out the printing process, the stretching device and at the same time the workpiece are carried along with the endless belt.
Eine bevorzugte Ausgestaltungsvariante der Erfindung ist dadurch gekennzeichnet, dass der Dehnvorrichtung eine Korona zugeordnet ist, die die Übertragung des Beschichtungsmaterials auf die zu bedruckende Druckfläche des Werkstückes bewirkt oder unterstützt.A preferred embodiment variant of the invention is characterized in that the stretching device is assigned a corona which effects or supports the transfer of the coating material to the printing surface of the workpiece to be printed.
Die Erfindung wird im Folgenden anhand eines in der Zeichnung dargestelltenThe invention is described below with reference to one in the drawing
Ausführungsbeispieles näher erläutert. Die Zeichnung zeigt in schematischer Darstellung eine Druckvorrichtung, der von einer Transportvorrichtung 10 fortlaufend Werkstücke 11 zugeführt werden. Die Werkstücke 11 sind vorliegend als Teller ausgebildet, die eine nach oben weisende Druckfläche 12 aufweisen. Diese Druckfläche 12 gilt es mit der nachstehend näher beschriebenen Druckvorrichtung zu bedrucken. Ohne Beschränkung auf die Allgemeinheit kann es sich bei den Werkstücken 1 1 auch um andere, bereits zuvor beschriebene Werkstücke aus Glas, Glaskeramik oder Kunststoff handeln.Embodiment explained in more detail. The drawing shows a schematic representation of a printing device to which workpieces 11 are continuously fed by a transport device 10. The workpieces 11 are in the present case in the form of plates which have an upwardly facing pressure surface 12. This printing area 12 is to be printed with the printing device described in more detail below. Without being restricted to the general public, the workpieces 11 can also be other workpieces made of glass, glass ceramic or plastic, which have already been described above.
Die Druckvorrichtung weist eine erste Ubertragungswalze 24 auf, die in bekannter Weise elektrostatisch aufgeladen und dann mit Tonerteilchen 27 eines Toners 26 beschichtet werden kann. Der Toner 26 ist in einem Vor-ratsbehälter 25 gehalten. Im vorliegenden Ausführungsbeispiel ist im Vorratsbehälter 25 schwarz gefärbter Toner 26 bevorratet. Neben der Ubertragungswalze 24 sind noch drei weitere Übertragungswalzen 28 vorgesehen. Diesen Übertragungswalzen 28 sind weitere Vorratsbehälter 29 zugeordnet. In den einzelnen Vorratsbehältern 29 sind farbige Toner eingefüllt. Die Übertragungswalzen 28 können mit diesem farbigen Tonern beschichtet werden. Unterhalb der Übertragungswalzen 24 und 28 ist eine Übertragungsvorrichtung 20 angeordnet. Die Übertragungsvorrichtung 20 weist ein als Dehnelement 22 ausgebildetes Endlosband auf. Dieses Endlosband 22 ist vorliegend als Gummi- band ausgestaltet. Das Gummiband 22 ist über zwei zueinander beabstandet gehaltene Transportwalzen 21 umgelenkt. Die linke der beiden Transportwalzen 21 ist dabei von einem, in der Zeichnung nicht dargestellten Motor angetrieben. Dementsprechend bildet das Gummiband einen oberen auflaufenden Trum 22.1 und einen unteren ablaufenden Trum 22.1. Der linken Transportwalze 21 ist auch eine Spanneinheit 40 zugeordnet. Mittels dieser Spanneinheit 40 kann dasThe printing device has a first transfer roller 24 which can be electrostatically charged in a known manner and then coated with toner particles 27 of a toner 26. The toner 26 is held in a storage container 25. In the present exemplary embodiment, black-colored toner 26 is stored in the storage container 25. In addition to the transfer roller 24, three further transfer rollers 28 are provided. Further transfer containers 29 are assigned to these transfer rollers 28. Colored toners are filled in the individual storage containers 29. The transfer rollers 28 can be coated with this colored toner. A transfer device 20 is arranged below the transfer rollers 24 and 28. The transmission device 20 has an endless belt designed as an expansion element 22. In the present case, this endless belt 22 is designed as a rubber belt. The rubber band 22 is deflected via two transport rollers 21 which are held at a distance from one another. The left of the two transport rollers 21 is driven by a motor, not shown in the drawing. Accordingly, the rubber band forms an upper run 22.1 and a lower run 22.1. A tensioning unit 40 is also assigned to the left transport roller 21. By means of this clamping unit 40, the
Gummiband 22 vorgespannt werden.Rubber band 22 are biased.
Der rechten Transportwalze 21 ist eine Reinigungsvorrichtung 23 zugeordnet, deren Funktionsweise nachstehend noch erläutert wird.The right transport roller 21 is assigned a cleaning device 23, the operation of which will be explained below.
Zwischen den beiden Transportwalzen 21 und zwischen dem auflaufenden und dem ablaufenden Trum 22.2 und 22.1 ist eine Dehnvorrichtung 30 angeordnet. Die Dehnvorrichtung 30 weist einen Antrieb 31 auf, der einen Stößel 32 linear verfährt. Der Stößel 32 trägt an seinem, dem Antrieb 31 abgewandtem Ende einen Stempel 33. Der Stempel 33 besitzt eine nach unten gewandte Stempelfläche 34. Die Stempelfläche 34 ist auf die Druckfläche 12 des Werkstückes 11 angepaßt ausgebildet und entsprechend gekrümmt.A stretching device 30 is arranged between the two transport rollers 21 and between the run-in and run-out runs 22.2 and 22.1. The stretching device 30 has a drive 31 which moves a plunger 32 linearly. The plunger 32 carries a stamp 33 at its end facing away from the drive 31. The stamp 33 has a stamp surface 34 facing downwards. The stamp surface 34 is designed to be adapted to the pressure surface 12 of the workpiece 11 and is curved accordingly.
Während des Betriebes der Druckvorrichtung wird die Ubertragungswalze 24 mit den Tonerteilchen 27 beschichtet. Gegebenfalls werden auch die Übertragungswalzen 28 mit farbigen Tonerteilchen beschichtet. Die Übertragungswalzen 24 und 28 drehen sich im Uhrzeigersinn. Die Transportwalzen 21 hingegen drehen sich gegen den Uhrzeigersinn. Dementsprechend wird der auflaufende Trum 22.2 von rechts nach links an den Übertragungswalzen 24 und 28 vorbei- geführt. Die Umlaufgeschwindigkeit des Gummibandes 22 und der Oberfläche der Übertragungswalzen 24 und 28 ist aufeinander abgestimmt. Zur Übertragung der Farbpartikel 27 werden Koronen 35 verwendet. Diese übertragen die Farbpartikel 27 auf den auflaufenden Trum 22.2 des Gummibandes 22. Die Farbpartikel 27 werden auf dem Gummiband 22 an der linken Transportwalze 21 vorbeitransportiert und gelangen dann in den Bereich des ablaufenden Trummes 22.1. Wenn die Farbpartikel 27, die beispielsweise ein Motiv gestalten, unterhalb der Dehnvorrichtung 30 angelangt sind, wird die Transportwalze 21 gestoppt. Dann kann der Stempel 33 in Richtung auf die Werkstücke 1 1 mittels des Antriebes 31 verfahren werden. Dabei dehnt sich das Gummiband 22 und legt sich an die Stempelfläche 34 an. Der Stempel 33 drückt dann das Gummiband 22 auf die Druckfläche 12 auf. Vorteilhafterweise kann der Stempel 33 gleichzeitig auch mit einer Heizvorrichtung versehen sein, die eine Fixierung der Farbpartikel 27 auf der Werkstückoberfläche erreicht.During operation of the printing device, the transfer roller 24 is coated with the toner particles 27. Optionally, the transfer rollers 28 are coated with colored toner particles. The transfer rollers 24 and 28 rotate clockwise. The transport rollers 21, however, rotate counterclockwise. Accordingly, the run-up strand 22.2 is passed from right to left past the transfer rollers 24 and 28. guided. The rotational speed of the rubber band 22 and the surface of the transfer rollers 24 and 28 are coordinated. Corones 35 are used to transfer the color particles 27. These transfer the ink particles 27 to the run-up strand 22.2 of the rubber band 22. The ink particles 27 are transported on the rubber band 22 past the left transport roller 21 and then reach the area of the run-off strand 22.1. When the ink particles 27, which for example design a motif, have reached below the stretching device 30, the transport roller 21 is stopped. Then the punch 33 can be moved in the direction of the workpieces 11 by means of the drive 31. The elastic band 22 expands and lies against the stamp surface 34. The stamp 33 then presses the rubber band 22 onto the pressure surface 12. Advantageously, the stamp 33 can at the same time also be provided with a heating device which fixes the ink particles 27 on the workpiece surface.
Nach Beendigung der Übertragung der Farbpartikel 27 wird der Stempel 33 wieder in seine obere Ausgangsstellung zurückgefahren. Das Gummiband 22 kann dann weiter gedreht werden, wozu die Transportwalze 21 gedreht wird.After the transfer of the ink particles 27 has ended, the stamp 33 is moved back into its upper starting position. The rubber band 22 can then be rotated further, for which purpose the transport roller 21 is rotated.
Gleichzeitig fährt auch die Transportvorrichtung 10 und stellt das nächste Werkstück 1 1 unter die Dehnvorrichtung 30. Das mit dem Druck 13 versehene Werkstück 1 1 wird aus dem Wirkungsbereich der Druckvorrichtung heraustransportiert.At the same time, the transport device 10 also moves and places the next workpiece 11 under the stretching device 30. The workpiece 11 provided with the pressure 13 is transported out of the effective range of the printing device.
Um zu verhindern, dass Tonerteilchen 27, die nicht auf das Werkstück 11 übertragen wurden und dementsprechend noch an dem Gummiband 22 anhaften, verschleppt werden, wird die Reinigungsvorrichtung 23 eingesetzt. Die Reinigungsvorrichtung 23 kann beispielweise eine beheizte Walze sein, die auf dem Gummiband 22 abrollt. Der beheizten Walze ist ihrerseits wieder eine Bürste zugeordnet, die die Tonerteilchen 27 abnimmt. Um ein Verschlepen von Tonerteilchen 27 sicher zu verhindern, kann das Gummiband 22 auch an seiner Trägerfläche mit einer Silikonbeschichtung versehen sein. Denkbar ist es auch, eine Schicht auf Silikongummi auf das Gummiband 22 aufzubringen. In order to prevent that toner particles 27 that have not been transferred to the workpiece 11 and accordingly still adhere to the rubber band 22 are carried over, the cleaning device 23 is used. The cleaning device 23 can be, for example, a heated roller that is on the rubber band 22 rolls. The heated roller is in turn associated with a brush that removes the toner particles 27. In order to reliably prevent toner particles 27 from being carried over, the rubber band 22 can also be provided with a silicone coating on its carrier surface. It is also conceivable to apply a layer of silicone rubber to the rubber band 22.

Claims

Patentansprüche claims
1 . Druckvorrichtung mit wenigstens einer Ubertragungswalze, die auf ihrer Walzenoberfläche zumindest teilweise mit Beschichtungsmaterial, beispielsweise einem Toner beaufschlagbar ist, wobei das Beschichtungsmaterial mittelbar oder unmittelbar auf eine Trägerfläche eines Über- tragungselementes aufbringbar ist, dadurch gekennzeichnet, dass das Übertragungselement ein Dehnelement (22) aufweist, das die Trägerfläche bildet, und dass die Trägerfläche mittels einer Dehnvorrichtung (30) dehnbar ist.1 . Printing device with at least one transfer roller which can be at least partially coated with coating material, for example a toner, on its roller surface, the coating material being able to be applied directly or indirectly to a carrier surface of a transfer element, characterized in that the transfer element has an expansion element (22), that forms the support surface, and that the support surface is expandable by means of a stretching device (30).
2. Druckvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das Übertragungselement als endlos umlaufendes Band ausgebildet ist, das entlang seiner Längserstreckung zumindest bereichsweise mit Dehnelementen (22) bestückt ist oder das selbst als Dehnelement (22) ausgebildet ist.2. Printing device according to claim 1, characterized in that the transmission element is designed as an endlessly circulating belt which is at least partially equipped with expansion elements (22) along its longitudinal extent or which is itself designed as an expansion element (22).
3. Druckvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Übertragungselement als Gummiband ausgebildet ist. 3. Printing device according to claim 2, characterized in that the transmission element is designed as a rubber band.
4. Druckvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Dehnvorrichtung (30) einen Stempel (33) aufweist, dass der Stempel (33) eine Stempelfläche (34) aufweist, die an die zu bedruckende Druckfläche (12) des Werkstückes (11 ) angepaßt ausgebildet ist, und dass die Trägerfläche des Dehnelementes (22) aus ihrer gestreckten4. Printing device according to one of claims 1 to 3, characterized in that the stretching device (30) has a stamp (33), that the stamp (33) has a stamp surface (34) which on the printing surface (12) to be printed on Workpiece (11) is adapted, and that the support surface of the expansion element (22) from its extended
Ausgangslage mittels des Stempels (33) auf die Druckfläche (12) aufpressbar ist.Starting position can be pressed onto the pressure surface (12) by means of the stamp (33).
5. Druckvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Stempelfläche (34) des Stempels (33) von einem elastischen, nachgiebigen Material gebildet ist.5. Printing device according to claim 4, characterized in that the stamp surface (34) of the stamp (33) is formed from an elastic, resilient material.
6. Druckvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass dem Übertragungselement eine Reinigungsvorrichtung (28) zugeordnet ist, mittels der die Trägerfläche des Dehnelementes (22) nach Beendigung des Druckvorgangs reinigbar ist.6. Printing device according to one of claims 1 to 5, characterized in that the transmission element is assigned a cleaning device (28) by means of which the carrier surface of the expansion element (22) can be cleaned after the printing process has ended.
7. Druckvorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Trägerfläche des Dehneiementes (22) mit einer Silikonbeschichtung versehen ist oder von einem Silikongummi gebildet ist.7. Printing device according to one of claims 1 to 6, characterized in that the carrier surface of the expansion element (22) is provided with a silicone coating or is formed by a silicone rubber.
8. Druckverfahren mit wenigstens einer Ubertragungswalze, die auf ihrer Walzenoberfläche mit einem Beschichtungsmaterial, beispielsweise einem Toner beaufschlagt wird, wobei das Beschichtungsmaterial von der Ubertragungswalze mittelbar oder unmittelbar auf eine Trägerfläche eines Übertraguπgselements aufgebracht wird, und wobei das Beschichtungs-8. Printing method with at least one transfer roller, which on its roller surface with a coating material, for example a Toner is applied, the coating material being applied directly or indirectly from the transfer roller to a carrier surface of a transfer element, and wherein the coating
10 material von dem Übertragungselement zumindest teilweise auf ein zu beschichtendes Werkstück aufgebracht wird, dadurch gekennzeichnet, dass das Übertragungselement ein Dehnelement (22) aufweist, das die Trägerfläche bildet, und10 material is at least partially applied by the transmission element to a workpiece to be coated, characterized in that the transmission element has an expansion element (22) which forms the carrier surface, and
15 dass die Trägerfläche mittels einer Dehnvorrichtung (30) in Flächenrichtung gedehnt wird.15 that the carrier surface is stretched in the surface direction by means of a stretching device (30).
9. Druckverfahren nach Anspruch 8, dadurch gekennzeichnet,9. Printing method according to claim 8, characterized in
20 dass das als flächenförmiges Gebilde ausgestaltete Dehnelement (22) zumindest in einem Teilbereich der Trägerfläche ein-, zwei- oder dreidimensional gedehnt wird.20 that the expansion element (22) designed as a sheet-like structure is expanded in one, two or three dimensions at least in a partial area of the support surface.
10. Druckverfahren nach Anspruch 8 oder 9, •>5 dadurch gekennzeichnet, dass das als Endlosband umlaufende Übertragungselement (20) an der Dehnvorrichtung (30) vorbeigeführt wird, und dass das Endlosband während der Dehnung der Trägerfläche und der Durchführung des Druckvorgaπges angehalten wird.10. Printing method according to claim 8 or 9, • > 5 characterized in that the continuous transmission element (20) is guided past the stretching device (30), and that the endless belt is stopped during the expansion of the support surface and the execution of the printing process.
3030
1 1. Druckverfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass das als Endlosband umlaufende Übertragungselement (20) an der Dehnvorichtung (30) vorbeiführbar ist,1 1. Printing method according to claim 8 or 9, characterized in that the circulating as an endless belt transmission element (20) past the stretching device (30),
35 dass während der Dehnung der Trägerfläche und der Durchführung des Druckvorganges die Dehnvorrichtung (30) und gleichzeitig das Werkstück (1 1 ) mit dem Endlosband mitgeführt werden.35 that the stretching device (30) and at the same time the workpiece (11) are carried along with the endless belt while the carrier surface is being stretched and the printing process is carried out.
12. Druckvorrichtung nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass der Dehnvorrichtung (30) eine Korona zugeordnet ist, die die Übertragung des Beschichtungsmaterials auf die zu bedruckende Druckfläche (12) des Werkstückes (1 1 ) bewirkt oder unterstützt. 12. Printing device according to one of claims 1 to 1 1, characterized in that the stretching device (30) is assigned a corona, which causes or supports the transfer of the coating material to the printing surface (12) to be printed on the workpiece (1 1).
EP00956429A 1999-08-13 2000-08-11 Printing device or printing method Expired - Lifetime EP1210230B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19938447A DE19938447B4 (en) 1999-08-13 1999-08-13 printing device
DE19938447 1999-08-13
PCT/EP2000/007819 WO2001012445A1 (en) 1999-08-13 2000-08-11 Printing device or printing method

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EP1210230A1 true EP1210230A1 (en) 2002-06-05
EP1210230B1 EP1210230B1 (en) 2003-10-15

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US (1) US6745684B1 (en)
EP (1) EP1210230B1 (en)
AT (1) ATE251993T1 (en)
AU (1) AU6837500A (en)
CA (1) CA2381577A1 (en)
DE (2) DE19938447B4 (en)
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WO (1) WO2001012445A1 (en)

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ES2208411T3 (en) 2004-06-16
AU6837500A (en) 2001-03-13
WO2001012445A1 (en) 2001-02-22
DE50004098D1 (en) 2003-11-20
US6745684B1 (en) 2004-06-08
CA2381577A1 (en) 2001-02-22
EP1210230B1 (en) 2003-10-15
ATE251993T1 (en) 2003-11-15
DE19938447B4 (en) 2005-08-11
DE19938447A1 (en) 2001-03-01

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