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EP0579017A1 - Device for tensioning a printing plate on a plate cylinder - Google Patents

Device for tensioning a printing plate on a plate cylinder Download PDF

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Publication number
EP0579017A1
EP0579017A1 EP93110229A EP93110229A EP0579017A1 EP 0579017 A1 EP0579017 A1 EP 0579017A1 EP 93110229 A EP93110229 A EP 93110229A EP 93110229 A EP93110229 A EP 93110229A EP 0579017 A1 EP0579017 A1 EP 0579017A1
Authority
EP
European Patent Office
Prior art keywords
clamping
elements
pressure plate
register
plate
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
EP93110229A
Other languages
German (de)
French (fr)
Other versions
EP0579017B1 (en
Inventor
Rolf-Peter Lehner
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.)
LEHNER GmbH
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LEHNER GmbH
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Filing date
Publication date
Application filed by LEHNER GmbH filed Critical LEHNER GmbH
Publication of EP0579017A1 publication Critical patent/EP0579017A1/en
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Publication of EP0579017B1 publication Critical patent/EP0579017B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206—Feeding to or removing from the forme cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/30—Detecting the correct position of printing plates on the cylinder

Definitions

  • the invention relates to a clamping device for clamping a printing plate on a plate cylinder, with a front clamping unit, which has fitting elements for applying the printing plate with its register punchings and in which the printing plate can be mechanically, hydraulically or pneumatically clamped when the register punchings are applied, with a rear clamping unit Recording and for clamping the pressure plate at its end opposite the register punchings, and with a clamping unit for clamping the pressure plate in the circumferential direction of the plate cylinder.
  • register punchings are made on the front edge of the printing plate, with which the printing plate is placed on dowel pins. If an offset printing plate is to be clamped onto a plate cylinder, the printing plate is first inserted with its front edge into a front clamping unit of the plate cylinder in such a way that the register punchings lie against the fitting elements provided therein. Then the pressure plate is clamped in the front clamping unit and the plate cylinder is slowly rotated until the pressure plate has wrapped around the outer surface of the plate cylinder and can be clamped with its rear end opposite the register punchings in a rear clamping unit, which in addition to the front clamping unit Plate cylinder is arranged.
  • the clamping units are moved towards one another, as a result of which the pressure plate is tensioned in the circumferential direction of the plate cylinder.
  • the pressure plate is subjected to high tensile forces.
  • the press can then be set up, for which the front and side registers and, if necessary, the inclined register can be adjusted.
  • the printing plate can become unusable due to an assembly error and must be replaced by a new printing plate, which causes considerable costs, in particular due to the downtime of the machine.
  • the object of the invention is to provide a clamping device for clamping a printing plate on a plate cylinder, with which assembly errors are largely excluded and which enables simple and quick clamping of the printing plate.
  • a clamping device for clamping a printing plate on a plate cylinder, with a front clamping unit, which has fitting elements for applying the printing plate with its register punchings and in which the printing plate can be mechanically, hydraulically or pneumatically clamped when the register punchings are applied rear clamping unit for receiving and clamping the pressure plate at its end opposite the register punchings, with a tensioning unit for tensioning the pressure plate in the circumferential direction of the plate cylinder, the fitting elements being assigned sensor elements, via which a check of the complete contact of the register punchings on the fitting elements is carried out.
  • sensor elements are thus provided, via which the complete installation of the register punchings on the fitting elements is checked. In this way, it is determined whether the register punchings lie completely against the fitting elements in the desired manner, so that the machine operator can only clamp the pressure plate at its front end after checking this condition, and incorrect assembly is thus avoided.
  • the fitting elements are pin-like elements which are designed as sensor elements.
  • the sensor elements are designed as electrical contact elements, via which an electrical circuit is closed via the pressure plate when the register punchings are completely in contact.
  • the sensor elements can also be constructed differently, that is to say, for example, they can be designed as inductive or capacitive sensor elements
  • the Sensor elements enables a particularly simple and reliable check of the desired mounting position of the pressure plate, since on the one hand electrical contact elements have a relatively simple structure and on the other hand a complete contact of the register punchings on the sensor elements is always ensured when the circuit via the pressure plate is closed.
  • actuating devices are provided for adjusting the pressure plate with respect to the plate cylinder, the actuating devices for setting up being adjustable into an initial position, and wherein at least one actuating device is assigned a further sensor element in order to check whether the actuating device is in the Starting position is.
  • At least one sensor element is coupled to an indicator for the optical and / or acoustic display of the state of the sensor element.
  • This measure has the advantage that a simple optical or acoustic control of the compliance with the necessary conditions during the clamping or tensioning process is made possible. So it can Installers are signaled in a simple manner whether the pressure plate with its register punchings lies correctly on the fitting elements and whether the actuating devices are in the starting position.
  • the indicators are designed as LEDs, which are integrated in the sensor elements. If indicators are provided which signal the correct placement of the register punchings on the fitting elements, and indicators are provided which signal that the actuating devices are in their starting position, LEDs of different colors can be integrated into the fitting elements for this purpose, for example.
  • the front clamping unit has a hydraulic, pneumatic or motorized actuating device which can only be activated when the pressure plate with its register punchings lies completely against the fitting elements and the actuating devices for adjusting the pressure plate in their initial positions are located.
  • the front clamping unit can only be actuated if both preconditions for correct tensioning of the pressure plate are met, namely if on the one hand the pressure plate with its register punchings lies completely against the fitting elements and on the other hand the adjusting devices for adjusting the Pressure plate are in their starting positions. In this way, assembly errors are completely excluded, and the assembly process is considerably simplified and shortened. Before the pressure plate is clamped, it is first checked whether the actuating devices are in their initial position.
  • the clamping process on the front clamping unit is interrupted if the pressure plate should move, so that a complete contact of the pressure plate with its register punchings on the fitting elements is no longer guaranteed.
  • the numeral 12 indicates a section of a plate cylinder of an offset sheet-fed printing press, which has on its surface an approximately rectangular recess 11 running in the axial direction, within which a tensioning device according to the invention, which is designated by the numeral 10, is arranged is.
  • a front clamping unit which is provided for clamping a pressure plate 14 at its front end 65, which is provided with register punchings, is designated overall by the number 30.
  • a correspondingly constructed rear clamping unit 32 is arranged below the front clamping unit 30. Both clamping units 30, 32 can be displaced in relation to the edge of the recess 11 in the tangential direction of the plate cylinder 12 via hydraulic actuating devices 46 and 47, as indicated by the arrows 40, 41.
  • the clamping units 30, 32 are each connected via a guide 19 or 21 to an intermediate plate 34 or 36.
  • Each intermediate plate 34 or 36 is in turn adjustable via an adjusting device 42 or 44 in the axial direction of the plate cylinder 12.
  • actuators are not described in detail here and are only indicated schematically in the drawing, since they are known per se.
  • further adjusting devices can be provided.
  • the front clamping unit 30 and the rear clamping unit 32 each have a rectangular inner clamping rail 18 or 26, which runs in the axial direction of the plate cylinder 12.
  • An outer clamping rail 20 or 28 is provided parallel to the inner clamping rail 18 or 26, which is slightly beveled towards the outside in order to achieve a better adaptation of the shape to the circumference of the plate cylinder 12, since the tensioning device 10 may not project beyond the circumferential line of the plate cylinder 12 at any point.
  • the outer tensioning rails 20 and 28 are each connected to the inner tensioning rails 18 and 26 via a hydraulic cylinder, which is indicated schematically by the number 22 and 24, respectively.
  • the outer clamping rails 20 and 28 can be moved via the hydraulic cylinders 22 and 24 in the direction of the inner clamping rails 18 and 26, so that an intermediate pressure plate 14 can be securely clamped between the clamping rails.
  • two fitting elements 16, 17 are arranged on the inner clamping rail 18 of the front clamping unit 30, against which the pressure plate 14 with its register punchings 50, 52 can be placed.
  • a first fitting element 16 has a circular shape, the radius being a few hundredths of a millimeter smaller than the radius of the register punchings 52, and a second fitting element 17 has approximately one oval shape, the rounding having a noticeably smaller radius than the radius of the register punch 50.
  • This shape of the fitting elements 16, 17 enables the printing plate 14 with its register punchings 50, 52 to fit perfectly against the fitting elements 17, 16.
  • the fitting elements 16, 17 are simultaneously designed as electrical contact elements and thus as sensor elements to make electrical contact with produce the electrically conductive pressure plate 14.
  • two LED elements 56, 60 and 54, 58 are arranged side by side, which are recognizable from the outside.
  • a control unit which is indicated only schematically in FIG. 2 and which is designated by the number 62, is connected to the LEDs via suitable control lines.
  • an LED 56 or 54 is connected in series with the applied voltage, so that when the circuit is closed via a pressure plate 14 between the fitting elements 16, 17, both LEDs light up.
  • the two remaining LEDs 58 and 60 are controlled via the control unit 62 in such a way that they only light up when four additional sensor elements 48, 49 and 68, 69 connected to the control unit 62 signal that the actuating devices 42, 44, 46 , 47 are in their starting position.
  • both clamping units 30, 32 are first released and the actuating devices 42, 44, 46, 47 are moved into their starting position. If the starting position is reached, this is indicated by the associated LEDs 58, 60 lighting up. Now the printing plate with its two register punchings is placed on the fitting elements until the reaching of the desired end position is signaled by the lighting up of the other two LEDs 54, 56, which expediently have a different color than the two LEDs mentioned above.
  • the front clamping unit 30 can now be activated when the control unit 62 emits an enable signal.
  • the hydraulic cylinder 22 is thus actuated and the pressure plate is clamped at its front end. If the pressure plate moves during the clamping process, this process is automatically interrupted.
  • the plate cylinder is set in a slow rotation until the pressure plate has laid out on the cylinder from the outside and is inserted with its rear end into the rear clamping unit 32 can. Now the pressure plate is also clamped at its rear end by actuating the hydraulic cylinder 24. The pressure plate is then clamped onto the plate cylinder, for which purpose the preferably hydraulic actuating devices 46 and 47 are actuated, as a result of which the front clamping unit 30 and the rear clamping unit 32 are moved towards one another in the tangential direction of the plate cylinder 12 in the direction of the arrows 37, 38, so that the printing plate is clamped onto the plate cylinder with high force.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

A device for tensioning a printing plate on an impression cylinder is specified, having a front clamping unit which has register elements (16, 17) for attaching the printing plate (14) with its register punchings (50, 52) and in which the printing plate (14) can be clamped mechanically, hydraulically or pneumatically with the register punchings (50, 52) in contact. Furthermore, a rear clamping unit is provided for receiving and for clamping the printing plate (14) at its end opposite the register punchings, and a tensioning unit for tensioning the printing plate (14) in the circumferential direction of the impression cylinder. In order to guarantee correct contact of the printing plate with its register punchings against the register elements, sensor elements (48, 49, 68, 69) are provided, by means of which the complete contact of the register punchings (50, 52) against the register elements (16, 17) is checked. <IMAGE>

Description

Die Erfindung betrifft eine Spannvorrichtung zum Spannen einer Druckplatte auf einem Plattenzylinder, mit einer vorderen Klemmeinheit, welche Paßelemente zum Anlegen der Druckplatte mit ihre Registerstanzungen aufweist und in welcher die Druckplatte bei Anlage der Registerstanzungen mechanisch, hydraulisch oder pneumatisch klemmbar ist, mit einer hinteren Klemmeinheit zur Aufnahme und zum Klemmen der Druckplatte an ihrem den Registerstanzungen gegenüberliegenden Ende, und mit einer Spanneinheit zum Spannen der Druckplatte in Umfangsrichtung des Plattenzylinders.The invention relates to a clamping device for clamping a printing plate on a plate cylinder, with a front clamping unit, which has fitting elements for applying the printing plate with its register punchings and in which the printing plate can be mechanically, hydraulically or pneumatically clamped when the register punchings are applied, with a rear clamping unit Recording and for clamping the pressure plate at its end opposite the register punchings, and with a clamping unit for clamping the pressure plate in the circumferential direction of the plate cylinder.

Selbst bei modernen Druckmaschinen, welche weitgehend automatisiert sind, ist zu Beginn des Druckvorganges ein Einrichten der Maschine erforderlich, um sicherzustellen, daß das Druckbild in einer korrekten Lage auf dem Druckpapier erscheint und daß insbesondere bei Mehrfarbendruck die verschiedenen Druckfarben in der korrekten Lage übereinander erscheinen, so daß das Druckbild stimmt und die gewünschte Farbwirkung erzielt wird.Even with modern printing machines, which are largely automated, it is necessary to set up the machine at the start of the printing process to ensure that the print image appears in the correct position on the printing paper and that, in particular in the case of multicolor printing, the different printing inks appear in the correct position on top of one another, so that the printed image is correct and the desired color effect is achieved.

Beim Offset-Druck werden als Druckplatten relativ dünne Metallfolien verwendet, bei welchen die in Druckrichtung gesehene vordere Kante als Bezugskante verwendet wird.In offset printing, relatively thin metal foils are used as printing plates, in which the front edge seen in the printing direction is used as the reference edge.

Um die korrekte Lage des Druckbildes auf dem Papier sicherzustellen, werden an der Vorderkante der Druckplatte sogenannte Registerstanzungen angebracht, mit welchen die Druckplatte an Paßstifte angelegt wird. Soll eine Offset-Druckplatte auf einen Plattenzylinder aufgespannt werden, so wird die Druckplatte zunächst mit ihrer Vorderkante derart in eine vordere Klemmeinheit des Plattenzylinders eingelegt, daß die Registerstanzungen an den darin vorgesehenen Paßelementen anliegen. Sodann wird die Druckplatte in der vorderen Klemmeinheit eingespannt und der Plattenzylinder wird langsam gedreht, bis sich die Druckplatte um die Außenfläche des Plattenzylinders gelegt hat und mit ihrem hinteren, den Registerstanzungen gegenüberliegenden Ende in eine hintere Klemmeinheit eingespannt werden kann, welche neben der vorderen Klemmeinheit im Plattenzylinder angeordnet ist.In order to ensure the correct position of the printed image on the paper, so-called register punchings are made on the front edge of the printing plate, with which the printing plate is placed on dowel pins. If an offset printing plate is to be clamped onto a plate cylinder, the printing plate is first inserted with its front edge into a front clamping unit of the plate cylinder in such a way that the register punchings lie against the fitting elements provided therein. Then the pressure plate is clamped in the front clamping unit and the plate cylinder is slowly rotated until the pressure plate has wrapped around the outer surface of the plate cylinder and can be clamped with its rear end opposite the register punchings in a rear clamping unit, which in addition to the front clamping unit Plate cylinder is arranged.

Ist die Druckplatte an ihren beiden Enden in den Klemmeinheiten fixiert, so werden die Klemmeinheiten aufeinanderzu bewegt, wodurch die Druckplatte in Umfangsrichtung des Plattenzylinders gespannt wird. Bei diesem Vorgang, welcher in herkömmlicher Weise mit Hilfe von Spannschrauben durchgeführt wird, wird die Druckplatte hohen Zugkräften ausgesetzt.If the pressure plate is fixed at both ends in the clamping units, the clamping units are moved towards one another, as a result of which the pressure plate is tensioned in the circumferential direction of the plate cylinder. In this process, which is carried out in a conventional manner with the aid of clamping screws, the pressure plate is subjected to high tensile forces.

Anschließend kann das Einrichten der Druckmaschine beginnen, wozu das Front- und Seitenregister und ggf. das Schrägregister verstellt werden können.The press can then be set up, for which the front and side registers and, if necessary, the inclined register can be adjusted.

Wird die Druckplatte beim Aufspannen auf den Plattenzylinder mit ihren Registerausstanzungen nicht korrekt an die Paßstifte angelegt, und die Druckplatte vollständig aufgespannt, bevor dieser Fehler entdeckt wird, so ist eine nachträgliche Korrektur kaum mehr möglich, da an der Druckplatte beim Aufspannvorgang lokale Verformungen, Markierungen und dgl. entstehen können.If the printing plate is not correctly positioned on the dowel pins with its register punchings when clamping onto the plate cylinder, and the printing plate is fully clamped before this error is discovered, then a subsequent correction is hardly possible, since local deformations, markings and Like. Can arise.

Somit kann die Druckplatte infolge eines Montagefehlers unbrauchbar werden und muß durch eine neue Druckplatte ersetzt werden, was erhebliche Kosten verursacht, insbesondere durch die Stillstandszeit der Maschine.Thus, the printing plate can become unusable due to an assembly error and must be replaced by a new printing plate, which causes considerable costs, in particular due to the downtime of the machine.

Die Aufgabe der Erfindung besteht darin, eine Spannvorrichtung zum Spannen einer Druckplatte auf einem Plattenzylinder zu schaffen, mit welcher Montagefehler weitgehend ausgeschlossen sind und welche ein einfaches und schnelles Spannen der Druckplatte ermöglicht.The object of the invention is to provide a clamping device for clamping a printing plate on a plate cylinder, with which assembly errors are largely excluded and which enables simple and quick clamping of the printing plate.

Erfindungsgemäß wird diese Aufgabe durch eine Spannvorrichtung zum Spannen einer Druckplatte auf einem Plattenzylinder gelöst, mit einer vorderen Klemmeinheit, welche Paßelemente zum Anlegen der Druckplatte mit ihren Registerstanzungen aufweist und in welcher die Druckplatte bei Anlage der Registerstanzungen mechanisch, hydraulisch oder pneumatisch klemmbar ist, mit einer hinteren Klemmeinheit zur Aufnahme und zum Klemmen der Druckplatte an ihrem den Registerstanzungen gegenüberliegenden Ende, mit einer Spanneinheit zum Spannen der Druckplatte in Umfangsrichtung des Plattenzylinders, wobei den Paßelementen Sensorelemente zugeordnet sind, über welche eine Prüfung der vollständigen Anlage der Registerstanzungen an den Paßelementen erfolgt.According to the invention, this object is achieved by a clamping device for clamping a printing plate on a plate cylinder, with a front clamping unit, which has fitting elements for applying the printing plate with its register punchings and in which the printing plate can be mechanically, hydraulically or pneumatically clamped when the register punchings are applied rear clamping unit for receiving and clamping the pressure plate at its end opposite the register punchings, with a tensioning unit for tensioning the pressure plate in the circumferential direction of the plate cylinder, the fitting elements being assigned sensor elements, via which a check of the complete contact of the register punchings on the fitting elements is carried out.

Erfindungsgemäß sind also Sensorelemente vorgesehen, über welche eine Prüfung der vollständigen Anlage der Registerstanzungen an den Paßelementen erfolgt. Auf diese Weise wird festgestellt, ob die Registerstanzungen in der gewünschten Weise vollständig an den Paßelementen anliegen, so daß der Einrichter der Maschine erst nach Kontrolle dieser Bedingung die Druckplatte an ihrem vorderen Ende einklemmen kann und somit eine Fehlmontage vermieden wird.According to the invention, sensor elements are thus provided, via which the complete installation of the register punchings on the fitting elements is checked. In this way, it is determined whether the register punchings lie completely against the fitting elements in the desired manner, so that the machine operator can only clamp the pressure plate at its front end after checking this condition, and incorrect assembly is thus avoided.

In bevorzugter Weiterbildung ist vorgesehen, daß die Paßelemente stiftartige Elemente sind, welche als Sensorelemente ausgebildet sind.In a preferred development it is provided that the fitting elements are pin-like elements which are designed as sensor elements.

Durch diese Maßnahme ist ein besonders einfacher Aufbau ermöglicht, da keine zusätzlichen Sensorelemente erforderlich sind, sondern die Sensorelemente mit den Paßelementen integriert sind.This measure enables a particularly simple construction, since no additional sensor elements are required, but rather the sensor elements are integrated with the fitting elements.

Bei einer vorteilhaften Weiterbildung der Erfindung sind die Sensorelemente als elektrische Kontaktelemente ausgebildet, über welche bei vollständiger Anlage der Registerstanzungen ein elektrischer Stromkreis über die Druckplatte geschlossen wird.In an advantageous further development of the invention, the sensor elements are designed as electrical contact elements, via which an electrical circuit is closed via the pressure plate when the register punchings are completely in contact.

Obwohl grundsätzlich die Sensorelemente auch andersartig aufgebaut sein können, also z.B. als induktive oder kapazitive Sensorelemente ausgebildet sein können, ist bei dieser Ausführung der Sensorelemente eine besonders einfache und zuverlässige Prüfung der gewünschten Montagelage der Druckplatte ermöglicht, da einerseits elektrische Kontaktelemente einen relativ einfachen Aufbau aufweisen und andererseits eine vollständige Anlage der Registerstanzungen an den Sensorelementen immer dann sichergestellt ist, wenn der Stromkreis über die Druckplatte geschlossen ist.Although in principle the sensor elements can also be constructed differently, that is to say, for example, they can be designed as inductive or capacitive sensor elements, in this embodiment the Sensor elements enables a particularly simple and reliable check of the desired mounting position of the pressure plate, since on the one hand electrical contact elements have a relatively simple structure and on the other hand a complete contact of the register punchings on the sensor elements is always ensured when the circuit via the pressure plate is closed.

In zusätzlicher Weiterbildung der Erfindung sind Stelleinrichtungen zur Verstellung der Druckplatte in Bezug auf den Plattenzylinder vorgesehen, wobei die Stelleinrichtungen zum Einrichten in eine Ausgangsposition verstellbar sind, und wobei mindestens einer Stelleinrichtung ein weiteres Sensorelement zugeordnet ist, um zu prüfen, ob sich die Stelleinrichtung in der Ausgangsposition befindet.In an additional development of the invention, actuating devices are provided for adjusting the pressure plate with respect to the plate cylinder, the actuating devices for setting up being adjustable into an initial position, and wherein at least one actuating device is assigned a further sensor element in order to check whether the actuating device is in the Starting position is.

Da zu Beginn des Andruckvorganges die Stelleinrichtungen zunächst in ihre Ausgangsposition zurückgestellt werden müssen, wird auf diese Weise mit Hilfe des Sensorelementes eine zusätzliche Prüfung ermöglicht, ob sich die jeweilige Stelleinrichtung in ihrer Ausgangsposition befindet. Somit wird der nachfolgende Einrichtvorgang erheblich vereinfacht, da durch die vorherige Prüfung sichergestellt ist, daß die Druckregister ausgehend von ihrer Ausgangsposition aus verstellt werden.Since the actuating devices must first be returned to their starting position at the beginning of the pressing process, an additional check is made possible in this way with the aid of the sensor element as to whether the respective actuating device is in its starting position. The subsequent setup process is thus considerably simplified since the previous check ensures that the print registers are adjusted starting from their starting position.

Bei einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß mindestens ein Sensorelement mit einem Indikator zur optischen und/oder akustischen Anzeige des Zustandes des Sensorelementes gekoppelt ist.In a further embodiment of the invention it is provided that at least one sensor element is coupled to an indicator for the optical and / or acoustic display of the state of the sensor element.

Diese Maßnahme hat den Vorteil, daß eine einfache optische bzw. akkustische Kontrolle der Einhaltung der notwendigen Bedingungen beim Klemm- bzw. Spannvorgang ermöglicht ist. So kann dem Einrichter auf einfache Weise signalisiert werden, ob die Druckplatte mit ihren Registerstanzungen korrekt an den Paßelementen anliegt und ob sich die Stelleinrichtungen in der Ausgangslage befinden.This measure has the advantage that a simple optical or acoustic control of the compliance with the necessary conditions during the clamping or tensioning process is made possible. So it can Installers are signaled in a simple manner whether the pressure plate with its register punchings lies correctly on the fitting elements and whether the actuating devices are in the starting position.

Bei einer bevorzugten Weiterbildung dieser Ausführung sind die Indikatoren als LEDs ausgebildet, welche in die Sensorelemente integriert sind. Sind sowohl Indikatoren vorgesehen, welche die korrekte Anlage der Registerstanzungen an den Paßelementen signalisieren, als auch Indikatoren vorgesehen, welche signalisieren, daß sich die Stelleinrichtungen in ihrer Ausgangsposition befinden, so können hierzu beispielsweise verschiedenfarbige LEDs in die Paßelemente integriert sein.In a preferred development of this embodiment, the indicators are designed as LEDs, which are integrated in the sensor elements. If indicators are provided which signal the correct placement of the register punchings on the fitting elements, and indicators are provided which signal that the actuating devices are in their starting position, LEDs of different colors can be integrated into the fitting elements for this purpose, for example.

Bei einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die vordere Klemmeinheit eine hydraulische, pneumatische oder motorische Betätigungseinrichtung aufweist, welche nur dann aktivierbar ist, wenn die Druckplatte mit ihren Registerstanzungen vollständig an den Paßelementen anliegt und sich die Stelleinrichtungen zur Verstellung der Druckplatte in ihren Ausgangspositionen befinden.In a further embodiment of the invention it is provided that the front clamping unit has a hydraulic, pneumatic or motorized actuating device which can only be activated when the pressure plate with its register punchings lies completely against the fitting elements and the actuating devices for adjusting the pressure plate in their initial positions are located.

Bei dieser Ausführung ist also sichergestellt, daß die vordere Klemmeinheit nur dann betätigt werden kann, wenn beide Vorbedingungen für eine korrekte Spannung der Druckplatte erfüllt sind, wenn nämlich einerseits die Druckplatte mit ihren Registerstanzungen vollständig an den Paßelementen anliegt und sich andererseits die Stelleinrichtungen zur Verstellung der Druckplatte in ihren Ausgangspositionen befinden. Auf diese Weise sind Montagefehler vollständig ausgeschlossen, und der Montagevorgang wird erheblich vereinfacht und verkürzt. Vor dem Einspannen der Druckplatte wird zunächst kontrolliert, ob sich die Stelleinrichtungen in ihrer Ausgangslage befinden.In this embodiment, it is thus ensured that the front clamping unit can only be actuated if both preconditions for correct tensioning of the pressure plate are met, namely if on the one hand the pressure plate with its register punchings lies completely against the fitting elements and on the other hand the adjusting devices for adjusting the Pressure plate are in their starting positions. In this way, assembly errors are completely excluded, and the assembly process is considerably simplified and shortened. Before the pressure plate is clamped, it is first checked whether the actuating devices are in their initial position.

Die Einhaltung dieser Bedingung kann leicht anhand der entsprechenden Indikatoren kontrolliert werden. Sodann wird die Druckplatte mit ihren Registerstanzungen an die Paßelemente angelegt, wobei die korrekte Lage wiederum durch Indikatoren signalisiert wird. Anschließend kann die Betätigungseinrichtung aktiviert werden, wozu vorzugsweise ein einziger Knopf, Hebel oder dgl. vorgesehen ist. Der Klemmvorgang an der vorderen Klemmeinheit läuft nun automatisch ab.Compliance with this condition can easily be checked using the relevant indicators. The printing plate with its register punchings is then placed on the fitting elements, the correct position being indicated by indicators. The actuating device can then be activated, for which purpose a single button, lever or the like is preferably provided. The clamping process on the front clamping unit now runs automatically.

In zusätzlicher Weiterbildung der Erfindung wird der Klemmvorgang an der vorderen Klemmeinheit unterbrochen, sofern sich die Druckplatte verschieben sollte, so daß eine vollständige Anlage der Druckplatte mit ihren Registerstanzungen an den Paßelementen nicht mehr gewährleistet ist.In an additional development of the invention, the clamping process on the front clamping unit is interrupted if the pressure plate should move, so that a complete contact of the pressure plate with its register punchings on the fitting elements is no longer guaranteed.

Es versteht sich, daß die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination indicated in each case, but also in other combinations or on their own without departing from the scope of the present invention.

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird unter Bezugnahme auf die Zeichnung nachstehend erläutert.A preferred embodiment of the invention is explained below with reference to the drawing.

Es zeigen:

Fig. 1
eine Teil-Seitenansicht eines Plattenzylinders mit der erfindungsgemäßen Vorrichtung in schematischer Darstellung und
Fig. 2
eine Aufsicht auf die vordere Klemmeinheit mit einer an die Paßelemente mit ihren Registerstanzungen angelegten Druckplatte in schematischer Darstellung.
Show it:
Fig. 1
a partial side view of a plate cylinder with the device according to the invention in a schematic representation and
Fig. 2
a plan view of the front clamping unit with a pressure plate applied to the fitting elements with their register punchings in a schematic representation.

In Fig. 1 ist mit der Ziffer 12 ein Ausschnitt eines Plattenzylinders einer Offset-Bogen-Druckmaschine angedeutet, welcher an seiner Oberfläche eine in Axialrichtung verlaufende etwa rechteckförmige Ausnehmung 11 aufweist, innerhalb derer eine erfindungsgemäße Spannvorrichtung angeordnet ist, die insgesamt mit der Ziffer 10 bezeichnet ist.In Fig. 1, the numeral 12 indicates a section of a plate cylinder of an offset sheet-fed printing press, which has on its surface an approximately rectangular recess 11 running in the axial direction, within which a tensioning device according to the invention, which is designated by the numeral 10, is arranged is.

Eine vordere Klemmeinheit, welche zur Klemmung einer Druckplatte 14 an ihrem vorderen, mit Registerstanzungen versehenen Ende 65 vorgesehen ist, ist insgesamt mit der Ziffer 30 bezeichnet.A front clamping unit, which is provided for clamping a pressure plate 14 at its front end 65, which is provided with register punchings, is designated overall by the number 30.

Unterhalb der vorderen Klemmeinheit 30 ist eine entsprechend aufgebaute hintere Klemmeinheit 32 angeordnet. Beide Klemmeinheiten 30, 32 sind über hydraulische Stelleinrichtungen 46 bzw. 47 jeweils gegenüber dem Rand der Ausnehmung 11 in Tangentialrichtung des Plattenzylinders 12 verschiebbar, wie durch die Pfeile 40, 41 angedeutet ist.A correspondingly constructed rear clamping unit 32 is arranged below the front clamping unit 30. Both clamping units 30, 32 can be displaced in relation to the edge of the recess 11 in the tangential direction of the plate cylinder 12 via hydraulic actuating devices 46 and 47, as indicated by the arrows 40, 41.

Dabei sind die Klemmeinheiten 30, 32 jeweils über eine Führung 19 bzw. 21 mit einer Zwischenplatte 34 bzw. 36 verbunden. Jede Zwischenplatte 34 bzw. 36 ist wiederum über eine Stelleinrichtung 42 bzw. 44 in Axialrichtung des Plattenzylinders 12 verstellbar.The clamping units 30, 32 are each connected via a guide 19 or 21 to an intermediate plate 34 or 36. Each intermediate plate 34 or 36 is in turn adjustable via an adjusting device 42 or 44 in the axial direction of the plate cylinder 12.

Die Stelleinrichtungen werden hier nicht näher beschrieben und sind in der Zeichnung nur schematisch angedeutet, da diese an sich bekannt sind. Zusätzlich können weitere Stelleinrichtungen vorgesehen sein.The actuators are not described in detail here and are only indicated schematically in the drawing, since they are known per se. In addition, further adjusting devices can be provided.

Die vordere Klemmeinheit 30 und die hintere Klemmeinheit 32 weisen jeweils eine rechteckförmige in Axialrichtung des Plattenzylinders 12 verlaufende innere Spannschiene 18 bzw. 26 auf. Parallel zu der inneren Spannschiene 18 bzw. 26 ist jeweils eine äußere Spannschiene 20 bzw. 28 vorgesehen, welche nach außen hin leicht abgeschrägt ist, um eine bessere Anpassung der Form an den Umfang des Plattenzylinders 12 zu erreichen, da ja die Spanneinrichtung 10 an keiner Stelle über die Umfangslinie des Plattenzylinders 12 hervorstehen darf.The front clamping unit 30 and the rear clamping unit 32 each have a rectangular inner clamping rail 18 or 26, which runs in the axial direction of the plate cylinder 12. An outer clamping rail 20 or 28 is provided parallel to the inner clamping rail 18 or 26, which is slightly beveled towards the outside in order to achieve a better adaptation of the shape to the circumference of the plate cylinder 12, since the tensioning device 10 may not project beyond the circumferential line of the plate cylinder 12 at any point.

Die äußeren Spannschienen 20 bzw. 28 sind jeweils über einen Hydraulikzylinder, welcher schematisch mit der Ziffer 22 bzw. 24 angedeutet ist, mit den inneren Spannschienen 18 bzw. 26 verbunden. Die äußeren Spannschienen 20 bzw. 28 sind über die Hydraulikzylinder 22 bzw. 24 in Richtung auf die inneren Spannschienen 18 bzw. 26 verfahrbar, so daß eine dazwischen befindliche Druckplatte 14 sicher zwischen den Spannschienen festgeklemmt werden kann.The outer tensioning rails 20 and 28 are each connected to the inner tensioning rails 18 and 26 via a hydraulic cylinder, which is indicated schematically by the number 22 and 24, respectively. The outer clamping rails 20 and 28 can be moved via the hydraulic cylinders 22 and 24 in the direction of the inner clamping rails 18 and 26, so that an intermediate pressure plate 14 can be securely clamped between the clamping rails.

Auf der inneren Spannschiene 18 der vorderen Klemmeinheit 30 sind gemäß Fig. 2 zwei Paßelemente 16, 17 angeordnet, an welche die Druckplatte 14 mit ihren Registerstanzungen 50, 52 anlegbar ist.According to FIG. 2, two fitting elements 16, 17 are arranged on the inner clamping rail 18 of the front clamping unit 30, against which the pressure plate 14 with its register punchings 50, 52 can be placed.

Da die Registerstanzungen 50, 52 an der Vorderkante 64 der Druckplatte 14 halbkreisförmig angebracht sind, weist ein erstes Paßelement 16 eine kreisförmige Form auf, wobei der Radius wenige Hundertstel Millimeter geringer ist als der Radius der Registerstanzungen 52, und ein zweites Paßelement 17 weist eine etwa ovale Form auf, wobei die Rundung einen merklich kleineren Radius besitzt als der Radius der Registerstanzung 50. Durch diese Form der Paßelemente 16, 17 ist eine einwandfreie Anlage der Druckplatte 14 mit ihren Registerstanzungen 50, 52 an den Paßelementen 17, 16 ermöglicht. Die Paßelemente 16, 17 sind gleichzeitig als elektrische Kontaktelemente und damit als Sensorelemente ausgebildet, um einen elektrischen Kontakt mit der elektrisch leitfähigen Druckplatte 14 herzustellen. Innerhalb jedes Paßelementes 16, 17 sind nebeneinander zwei LED-Elemente 56, 60 bzw. 54, 58 angeordnet, welche von außen erkennbar sind.Since the register punchings 50, 52 are attached to the front edge 64 of the pressure plate 14 in a semicircular shape, a first fitting element 16 has a circular shape, the radius being a few hundredths of a millimeter smaller than the radius of the register punchings 52, and a second fitting element 17 has approximately one oval shape, the rounding having a noticeably smaller radius than the radius of the register punch 50. This shape of the fitting elements 16, 17 enables the printing plate 14 with its register punchings 50, 52 to fit perfectly against the fitting elements 17, 16. The fitting elements 16, 17 are simultaneously designed as electrical contact elements and thus as sensor elements to make electrical contact with produce the electrically conductive pressure plate 14. Within each fitting element 16, 17 two LED elements 56, 60 and 54, 58 are arranged side by side, which are recognizable from the outside.

Eine in Fig. 2 nur schematisch angedeutete Steuereinheit, welche mit der Ziffer 62 bezeichnet ist, ist mit den LEDs über geeignete Steuerleitungen verbunden. Bei jedem Paßelement 16, 17 ist eine LED 56 bzw. 54 mit der angelegten Spannung in Reihe geschaltet, so daß dann, wenn der Stromkreis über eine zwischen den Paßelementen 16, 17 anliegende Druckplatte 14 geschlossen ist, beide LEDs aufleuchten. Die beiden übrigen LEDs 58 bzw. 60 werden über die Steuereinheit 62 derart angesteuert, daß diese nur dann aufleuchten, wenn vier zusätzlich mit der Steuereinheit 62 verbundene Sensorelemente 48, 49 bzw. 68, 69 signalisieren, daß sich die Stelleinrichtungen 42, 44, 46, 47 in ihrer Ausgangsstellung befinden.A control unit, which is indicated only schematically in FIG. 2 and which is designated by the number 62, is connected to the LEDs via suitable control lines. For each fitting element 16, 17, an LED 56 or 54 is connected in series with the applied voltage, so that when the circuit is closed via a pressure plate 14 between the fitting elements 16, 17, both LEDs light up. The two remaining LEDs 58 and 60 are controlled via the control unit 62 in such a way that they only light up when four additional sensor elements 48, 49 and 68, 69 connected to the control unit 62 signal that the actuating devices 42, 44, 46 , 47 are in their starting position.

Soll eine Druckplatte auf dem Plattenzylinder aufgespannt werden, so werden zunächst beide Klemmeinheiten 30, 32 gelöst und die Stelleinrichtungen 42, 44, 46, 47 in ihre Ausgangsstellung gefahren. Ist die Ausgangsstellung erreicht, so wird dies durch Aufleuchten der zugehörigen LEDs 58, 60 angezeigt. Nun wird die Druckplatte mit ihren beiden Registerstanzungen an die Paßelemente angelegt, bis das Erreichen der gewünschten Endposition durch Aufleuchten der beiden anderen LEDs 54, 56 signalisiert wird, welche zweckmäßigerweise eine andere Farbe als die beiden zuvor genannten LEDs aufweisen. Die vordere Klemmeinheit 30 kann nun aktiviert werden, wenn die Steuereinheit 62 ein Freigabesignal abgibt. Der Hydraulikzylinder 22 wird somit betätigt und die Druckplatte an ihrem vorderen Ende festgeklemmt. Sollte sich die Druckplatte bei dem Klemmvorgang verschieben, so wird dieser Vorgang automatisch unterbrochen.If a printing plate is to be clamped on the plate cylinder, both clamping units 30, 32 are first released and the actuating devices 42, 44, 46, 47 are moved into their starting position. If the starting position is reached, this is indicated by the associated LEDs 58, 60 lighting up. Now the printing plate with its two register punchings is placed on the fitting elements until the reaching of the desired end position is signaled by the lighting up of the other two LEDs 54, 56, which expediently have a different color than the two LEDs mentioned above. The front clamping unit 30 can now be activated when the control unit 62 emits an enable signal. The hydraulic cylinder 22 is thus actuated and the pressure plate is clamped at its front end. If the pressure plate moves during the clamping process, this process is automatically interrupted.

Ist die Druckplatte an ihrem vorderen Ende in der vorgesehenen Weise in der vorderen Klemmeinheit eingespannt, so wird der Plattenzylinder in eine langsame Drehung versetzt, bis sich die Druckplatte von außen auf den Zylinder ausgelegt hat und mit ihrem hinteren Ende in die hintere Klemmeinheit 32 eingeführt werden kann. Nun wird die Druckplatte an ihrem hinteren Ende gleichfalls durch Betätigen des Hydraulikzylinders 24 festgeklemmt. Anschließend erfolgt das Spannen der Druckplatte auf den Plattenzylinder, wozu die vorzugsweise hydraulische Stelleinrichtungen 46 bzw. 47 betätigt werden, wodurch die vordere Klemmeinheit 30 und die hintere Klemmeinheit 32 in Tangentialrichtung des Plattenzylinders 12 in Richtung der Pfeile 37, 38 aufeinander zu bewegt werden, so daß die Druckplatte mit hoher Kraft auf den Plattenzylinder aufgespannt wird.If the pressure plate is clamped at its front end in the intended manner in the front clamping unit, the plate cylinder is set in a slow rotation until the pressure plate has laid out on the cylinder from the outside and is inserted with its rear end into the rear clamping unit 32 can. Now the pressure plate is also clamped at its rear end by actuating the hydraulic cylinder 24. The pressure plate is then clamped onto the plate cylinder, for which purpose the preferably hydraulic actuating devices 46 and 47 are actuated, as a result of which the front clamping unit 30 and the rear clamping unit 32 are moved towards one another in the tangential direction of the plate cylinder 12 in the direction of the arrows 37, 38, so that the printing plate is clamped onto the plate cylinder with high force.

Claims (8)

Spannvorrichtung zum Spannen einer Druckplatte auf einem Druckzylinder, mit einer vorderen Klemmeinheit (30), welche Paßelemente (16, 17) zum Anlegen der Druckplatte (14) mit ihren Registerstanzungen (50, 52) aufweist und in welcher die Druckplatte (14) bei Anlage der Registerstanzungen (50, 52) mechanisch, hydraulisch oder pneumatisch klemmbar ist, mit einer hinteren Klemmeinheit (32) zur Aufnahme und zum Klemmen der Druckplatte (14) an ihrem den Registerstanzungen gegenüberliegenden Ende (66), mit einer Spanneinheit (34) zum Spannen der Druckplatte (14) in Umfangsrichtung des Druckzylinders (12), wobei den Paßelementen (16, 17) Sensorelemente zugeordnet sind, über welche eine Prüfung der vollständigen Anlage der Registerstanzungen (50, 52) an den Paßelementen (16, 17) erfolgt.Clamping device for clamping a printing plate on a printing cylinder, with a front clamping unit (30), which has fitting elements (16, 17) for applying the printing plate (14) with their register punchings (50, 52) and in which the printing plate (14) when in contact the register punchings (50, 52) can be clamped mechanically, hydraulically or pneumatically, with a rear clamping unit (32) for receiving and clamping the pressure plate (14) at its end (66) opposite the register punchings, with a clamping unit (34) for clamping the pressure plate (14) in the circumferential direction of the printing cylinder (12), the fitting elements (16, 17) being assigned sensor elements, via which the complete contact of the register punchings (50, 52) on the fitting elements (16, 17) is checked. Spannvorrichtung nach Anspruch 1, bei welcher die Paßelemente (16, 17) stiftartige Elemente sind, welche als Sensorelemente (16, 17) ausgebildet sind.Clamping device according to claim 1, wherein the fitting elements (16, 17) are pin-like elements which are designed as sensor elements (16, 17). Spannvorrichtung nach Anspruch 1 oder 2, bei welcher die Sensorelemente (16, 17) als elektrische Kontaktelemente ausgebildet sind, über welche bei vollständiger Anlage der Registerstanzungen (50, 52) ein elektrischer Stromkreis über die Druckplatte (14) geschlossen wird.Clamping device according to Claim 1 or 2, in which the sensor elements (16, 17) are designed as electrical contact elements, via which an electrical circuit is closed via the pressure plate (14) when the register punchings (50, 52) are fully seated. Spannvorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, welche Stelleinrichtungen (42, 44, 46, 47) zur Verstellung der Druckplatte (14) in Bezug auf den Druckzylinder (12) aufweist, wobei die Stelleinrichtungen zum Einrichten in eine Ausgangsposition verstellbar sind, und wobei mindestens einer Stelleinrichtung (42, 44, 46, 47) ein weiteres Sensorelement (48, 49, 68, 69) zugeordnet ist, um zu prüfen, ob sich die Stelleinrichtung (42, 44, 46, 47) in der Ausgangsposition befindet.Clamping device according to one or more of the preceding claims, which has adjusting devices (42, 44, 46, 47) for adjusting the pressure plate (14) in relation to the printing cylinder (12), the adjusting devices for adjusting being adjustable in an initial position, and wherein at least one actuating device (42, 44, 46, 47) is assigned a further sensor element (48, 49, 68, 69) in order to check whether the actuating device (42, 44, 46, 47) is in the starting position. Spannvorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, bei welcher mindestens ein Sensorelement (16, 17; 48, 49, 68, 69) mit einem Indikator (54, 56; 58, 60) zur optischen und/oder akustischen Anzeige des Zustandes des Sensorelementes gekoppelt ist.Clamping device according to one or more of the preceding claims, in which at least one sensor element (16, 17; 48, 49, 68, 69) with an indicator (54, 56; 58, 60) for the optical and / or acoustic display of the state of the sensor element is coupled. Spannvorrichtung nach Anspruch 5, bei welcher der Indikator (54, 56; 58, 60) als LED ausgebildet ist.Clamping device according to claim 5, wherein the indicator (54, 56; 58, 60) is designed as an LED. Spannvorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, bei welcher die vordere Klemmeinheit (30) eine hydraulische, pneumatische oder motorische Betätigungseinrichtung (22) aufweist, welche nur dann aktivierbar ist, wenn die Druckplatte (14) mit ihren Registerstanzungen (50, 52) vollständig an den Paßelementen (16, 17) anliegt und sich die Stelleinrichtungen (42, 44, 46, 47) zur Verstellung der Druckplatte (14) in ihren Ausgangspositionen befinden.Clamping device according to one or more of the preceding claims, in which the front clamping unit (30) has a hydraulic, pneumatic or motorized actuating device (22) which can only be activated when the pressure plate (14) with its register punchings (50, 52) is complete bears against the fitting elements (16, 17) and the actuating devices (42, 44, 46, 47) for adjusting the pressure plate (14) are in their starting positions. Spannvorrichtung nach Anspruch 7, bei welcher der Klemmvorgang unterbrochen wird, sobald die Druckplatte (14) mit ihren Registerstanzungen (50, 52) nicht mehr vollständig an den Paßelementen (16, 17) anliegt.Clamping device according to claim 7, in which the clamping process is interrupted as soon as the pressure plate (14) with its register punchings (50, 52) no longer lies completely against the fitting elements (16, 17).
EP93110229A 1992-06-30 1993-06-26 Device for tensioning a printing plate on a plate cylinder Expired - Lifetime EP0579017B1 (en)

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DE4223908 1992-06-30
DE4223908A DE4223908C2 (en) 1992-06-30 1992-06-30 Clamping device for clamping and adjusting a printing plate on a plate cylinder

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EP0579017A1 true EP0579017A1 (en) 1994-01-19
EP0579017B1 EP0579017B1 (en) 1997-09-10

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WO1996004139A1 (en) * 1994-08-05 1996-02-15 Tetra Pak Manufacturing Pty. Ltd. Alignment and affixing of printing plates
EP0710555A3 (en) * 1994-11-05 1996-09-25 Roland Man Druckmasch Method for automatic feeding of printing plates
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DE4223908A1 (en) 1994-01-05
DE4223908C2 (en) 1995-09-28
DE59307312D1 (en) 1997-10-16
EP0579017B1 (en) 1997-09-10

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