EP0592856A1 - Clamping device for fixing a flexible printing forme onto the surface of a cylinder - Google Patents

Clamping device for fixing a flexible printing forme onto the surface of a cylinder Download PDF

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Publication number
EP0592856A1
EP0592856A1 EP93115536A EP93115536A EP0592856A1 EP 0592856 A1 EP0592856 A1 EP 0592856A1 EP 93115536 A EP93115536 A EP 93115536A EP 93115536 A EP93115536 A EP 93115536A EP 0592856 A1 EP0592856 A1 EP 0592856A1
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EP
European Patent Office
Prior art keywords
cylinder
printing form
clamping device
channel
clamping
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EP93115536A
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German (de)
French (fr)
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EP0592856B1 (en
Inventor
Werner Weber
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP0592856A1 publication Critical patent/EP0592856A1/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
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1243—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by pivotal or swivelling motion, e.g. by means of a rocking lever

Definitions

  • the invention relates to a clamping device for a flexible printing form on the outer surface of a cylinder.
  • the invention can be used particularly advantageously in web-fed printing machines, where the plate cylinder channel for receiving the two ends of the printing form is said to have only a small width.
  • Solutions are known in which the leading end of the printing form is bent at an acute angle and is suspended in a groove of the cylinder which is undercut at the same angle.
  • the trailing end of the printing form is gripped by a holding element which is fastened to an axially parallel tension shaft and which, when the tension shaft rotates, applies a tensile force to the trailing end in the tangential direction.
  • a holding element which is fastened to an axially parallel tension shaft and which, when the tension shaft rotates, applies a tensile force to the trailing end in the tangential direction.
  • the published patent application DT 25 23 580 A1 describes a device for tensioning flexible printing forms, in which the printing form ends were each bent at an acute angle.
  • a tensioning shaft With a tensioning shaft, a bar, which engages behind the trailing end of the printing form, and a leaf spring with a clamping body seated at the end are firmly connected as holding and tensioning elements.
  • the tensioning shaft When the tensioning shaft is rotated, the clamping body presses the leading end of the printing form against the side wall of the cylinder channel, while the trailing end is fixed between the bar and the clamping body.
  • the tensioning shaft is turned, the trailing end is taken along by the bar in the tangential direction, so that the pressure plate on the cylinder surface is tightened.
  • the trailing end of the printing form which is bent at an acute angle, is disadvantageous when it is inserted into the channel. Furthermore, the bar causes a notch effect in the area already used by the bending, which can affect the service life and reusability.
  • the device shown in the patent DE 26 20 427 C3 contains as a resilient element an elastic clamping body, so that the risk of overstretching is alleviated is, but the disadvantages regarding said notch effect and handling remain.
  • the published patent document DT 22 35 119 contains a solution in which a double-layer leaf spring is attached radially to the tensioning shaft, the ends of which are angled in the tangential direction. When the tensioning shaft is rotated, a leaf spring end engages in the hook-shaped trailing end of the printing form.
  • another disadvantage is the fact that the trailing end must be folded twice. This represents an additional effort, the second bend being made at an obtuse angle not guaranteeing reproducible tension of the printing plate when it is reused.
  • the printing plate tensioning device according to the patent specification DE 21 16 570 C3 has similar disadvantages, in which no resilient element is provided and the said second folding is only carried out during the tensioning process. The handling of the pressure plate in a repeated clamping process is greatly affected.
  • one clamping bar is provided on each clamping shaft for the two ends of a printing form which are pre-folded at an acute angle, the clamping bars being supported against compression springs.
  • the disadvantage here is that two tensioning strips and two tensioning shafts, each with separate drives, are required, which requires increased effort.
  • the inclusion of the leading end of the printing form by means of a spring-loaded clamping bar causes the printing form to float on the cylinder, which can have an adverse effect on the print quality.
  • Another device for fastening a flexible pressure plate includes three clamping shafts which are arranged coaxially and can be rotated independently of one another. Terminal strips are attached to the inner solid shaft and the inner hollow shaft. A clamping bar is screwed onto the outer hollow shaft. The clamping strips allow the two ends of the pressure plate to be clamped independently of one another and, with the aid of the clamping strip, an additional one Tension of the trailing end of the pressure plate. Pressure springs, which are attached between the clamping strips, ensure that a uniform clamping force is exerted on the trailing end of the pressure plate. With this solution, the insertion of the trailing end is problematic because there are a large number of gaps that can accommodate the printing plate. Furthermore, the solution is costly in terms of material and costs due to the three clamping shafts and two clamping strips and the clamping strip with the respective actuating elements.
  • the object of the invention is to develop a clamping device for fastening a flexible printing form on the lateral surface of a cylinder, which can be produced with little effort, which enables quick clamping with little effort and which only requires little pressure on the printing form, so that multiple use is possible is.
  • a resilient element with two legs is attached to a tension shaft arranged in the channel of a cylinder, the trailing first leg seen in the direction of rotation of the cylinder protruding freely into the channel and the other leg the first leg Leg protrudes in the radial direction. Furthermore, the solution is that the trailing end of the printing form, which is bent at an obtuse angle, rests against an axially extending edge which is part of the trailing side surface of the channel.
  • the resilient element ensures automatic re-tensioning of the printing form.
  • the clamping device requires only a few components and a small installation space, so that the channel-related pressure-free edge of the plate cylinder can be reduced to two millimeters.
  • the clamping device can be used both for cylinders with a simple diameter also realize for cylinders of multiple diameters, such a clamping device then being assigned to each printing form which is to be clamped on the cylinder.
  • the clamping can be done quickly and with little effort, so that with a manually operated clamping the clamping device can be operated by only one person either from the drive or the operating side of the printing press.
  • the clamping is already achieved by a 10 ° rotation of the tension shaft.
  • the second leg can advantageously be rounded in the direction of the trailing end of the printing form and can rest on the leading side surface in the untensioned state. If the side walls of the channel are undercut as usual, then the legs in no way hinder the insertion of the trailing end of the printing form. For the same reason, it is advantageous if the ends of the legs are arranged inclined to one another.
  • the resilient elements each consist of a single U-shaped leaf spring-like part, which is attached with its web to the base of a rectangular, axially extending groove of the tensioning shaft, the first leg of the resilient element in one Partial area is in the untensioned state on the side surface of the rectangular groove.
  • the width of the groove of the tensioning shaft should be larger than the greatest width of the channel, the channel opening into the groove in the untensioned state.
  • Fig. 1 shows a plate cylinder 1 with a trapezoidal channel 2 for receiving the ends 3, 4 of a printing plate 5.
  • the end 3 which is leading during printing is bent at an acute angle and inserted into a rectangular groove 6, the angle of inclination of which extends to a tangential plane running in the center of the channel corresponds essentially to the folding angle.
  • the slot-shaped groove 6 opens into the peripheral region of the channel 2.
  • the trailing end 4 is bent at an obtuse angle and inserted into the channel 2.
  • the folding width of the end 4 is chosen to be larger than that of the end 3.
  • a clamping shaft 7 is rotatably arranged in the plate cylinder 1, the axis of rotation of which lies parallel to the axis of the cylinder 1.
  • a rectangular groove 8 is machined along the tension shaft 7, which is wider than the greatest width of the channel 2 and the opening of which is facing the channel 2.
  • several U-shaped leaf spring elements 11 are fastened to the base 9 of the groove 8 with their web 10 by means of a screw 12 and a nut 13.
  • the leaf spring elements 11 have in addition to their web 10 two legs 14, 15, which are each angled in their end region, so that the end pieces 16, 17 of the legs 14, 15 are inclined to each other.
  • the leg 14 In the released state of the clamping, the leg 14 lies in its lower area over the entire surface of the side wall 18 and the end piece 16 projects freely into the lower area of the channel 2.
  • the leg 15 projects beyond the end piece 16 of the leg 14 with its end piece 17
  • End piece 17 with a curve 19 runs out and rests on the leading side wall 20 of the channel 2 in the released state of the clamping.
  • the pressure plate 5 By rotating the tension shaft 7 about its axis in direction 21, the pressure plate 5 can be tensioned on the cylinder 1. By turning back in direction 22 the clamping can be released again.
  • the trailing end 4 of the printing form 5 is first pressed by the end piece 16 against an edge 23 in the first phase of the clamping, which end is pressed through the leading side wall 24 and the inner cylindrical surface 25 of the bore for the tensioning shaft 7 in Plate cylinder 1 is formed.
  • the end 4 can be bent slightly over the edge 23.
  • the end piece 17 with the concave curvature of the curve 19 presses against the inner surface of the end 4 of the printing forme 5, tensile stress being exerted on the printing forme 5 in the tangential direction.
  • the torque required for the tensioning of the printing form 5 on the tensioning shaft 7 is permanently present and can be applied with the aid of spiral springs.
  • the tensioning shaft 7 can be rotated by remote control.

Abstract

2.1. The object of the invention is to develop a clamping device for fixing a flexible printing forme onto the surface of a cylinder, which device can be produced at little expenditure, permits rapid clamping with little effort and poses only little loading on the printing forme so that it can be used several times. 2.2. The invention consists in that a resilient element (11) having two limbs (14, 15) is attached to a tensioning shaft (7) arranged in the gap (2) of a cylinder (1), the first limb (14), which is the trailing limb seen in the direction of rotation of the cylinder (1), protruding freely into the gap (2) in the untensioned state, and the other limb (15) projecting beyond the first limb (14) in the radial direction. Furthermore, the solution consists in the fact that the trailing end (4) of the printing forme (5), which is bent at an obtuse angle, bears against an axially extending edge (23) which is a constituent of the trailing side face (24) of the gap (2). 2.3. The invention can be used in printing machines, in particular in web-fed printing machines. <IMAGE>

Description

Die Erfindung betrifft eine Aufspannvorrichtung für eine biegsame Druckform auf der Mantelfläche eines Zylinders. Die Erfindung ist besonders vorteilhaft bei Rollendruckmaschinen anwendbar, wo der Plattenzylinderkanal für die Aufnahme der beiden Enden der Druckform nur eine geringe Breite aufweisen soll.The invention relates to a clamping device for a flexible printing form on the outer surface of a cylinder. The invention can be used particularly advantageously in web-fed printing machines, where the plate cylinder channel for receiving the two ends of the printing form is said to have only a small width.

Zum Aufspannen einer biegsamen Druckform auf der Mantelfläche eines Plattenzylinders ist es bekannt, die Enden der Druckform in einen Kanal oder eine Nut einzubringen, welcher achsparallel in die Oberfläche des Zylinders eingearbeitet ist. Die Enden der Druckform werden in einer Aufspannvorrichtung festgehalten und mit einer Tangentialkraft beaufschlagt, so daß die Druckform auf der Oberfläche des Zylinders gestrafft wird. Zum besseren Handhaben der Druckform und zum Erreichen einer formschlüssigen Festhaltung werden die Enden der Druckform plastisch verformt oder mit Halteöffnungen versehen bzw. kraft- oder reibschlüssig gehalten.To clamp a flexible printing form on the outer surface of a plate cylinder, it is known to insert the ends of the printing form into a channel or a groove which is machined axially parallel into the surface of the cylinder. The ends of the printing form are held in a clamping device and a tangential force is applied so that the printing form is tightened on the surface of the cylinder. For better handling of the printing form and to achieve a form-fitting retention, the ends of the printing form are plastically deformed or provided with holding openings or held non-positively or frictionally.

Es sind Lösungen bekannt, bei denen das vorlaufende Ende der Druckform spitzwinklig abgekantet wird und in eine im gleichen Winkel hinterschnittene Nut des Zylinders eingehängt wird. Das nachlaufende Ende der Druckform wird von einem Halteelement erfaßt, welches an einer achsparallelen Spannwelle befestigt ist und welches bei Rotation der Spannwelle das nachlaufende Ende in tangentialer Richtung mit einer Zugkraft beaufschlagt. Verschiedene Lösungen verwenden federnde Elemente, die als Halteelement und/oder Spannelement ausgebildet sind.Solutions are known in which the leading end of the printing form is bent at an acute angle and is suspended in a groove of the cylinder which is undercut at the same angle. The trailing end of the printing form is gripped by a holding element which is fastened to an axially parallel tension shaft and which, when the tension shaft rotates, applies a tensile force to the trailing end in the tangential direction. Use different solutions resilient elements which are designed as a holding element and / or tensioning element.

In der Offenlegungsschrift DT 25 23 580 A1 ist eine Vorrichtung zum Spannen von biegsamen Druckformen beschrieben, bei der die Druckformenden jeweils im spitzen Winkel abgekantet wurden. Mit einer Spannwelle sind als Halte- und Spannelemente eine Leiste, die das nachlaufende Ende der Druckform hintergreift, und eine Blattfeder mit einem am Ende sitzenden Klemmkörper fest verbunden. Beim Drehen der Spannwelle drückt der Klemmkörper das vorlaufende Ende der Druckform gegen die Seitenwand des Zylinderkanals, während das nachlaufende Ende zwischen der Leiste und dem Klemmkörper fixiert wird. Beim Verdrehen der Spannwelle wird das nachlaufende Ende durch die Leiste in tangentialer Richtung mitgenommen, so daß die Druckplatte auf der Zylinderoberfläche gestrafft wird.The published patent application DT 25 23 580 A1 describes a device for tensioning flexible printing forms, in which the printing form ends were each bent at an acute angle. With a tensioning shaft, a bar, which engages behind the trailing end of the printing form, and a leaf spring with a clamping body seated at the end are firmly connected as holding and tensioning elements. When the tensioning shaft is rotated, the clamping body presses the leading end of the printing form against the side wall of the cylinder channel, while the trailing end is fixed between the bar and the clamping body. When the tensioning shaft is turned, the trailing end is taken along by the bar in the tangential direction, so that the pressure plate on the cylinder surface is tightened.

Das spitzwinklig abgekantete, nachlaufende Ende der Druckform ist nachteilig beim Einlegen in den Kanal. Desweiteren verursacht die Leiste beim Spannen eine Kerbwirkung in den schon durch das Abkanten beanspruchten Bereich wodurch die Standzeit und die Wiederverwendbarkeit beeinträchtigt werden kann.The trailing end of the printing form, which is bent at an acute angle, is disadvantageous when it is inserted into the channel. Furthermore, the bar causes a notch effect in the area already used by the bending, which can affect the service life and reusability.

Dadurch, daß das nachlaufende Ende der Druckform zwischen der Leiste und dem Klemmkörper fixiert werden muß, treten in der Druckform in Umlaufrichtung Zugspannungen auf, die dann eine unzulässig hohe Dehnung verursachen, wenn die Abkantbreite an der oberen Toleranzgrenze liegt und die Reibung auf der Oberfläche des Zylinders so hoch liegt, daß die Druckform beim Spannen nicht nachrutscht.Due to the fact that the trailing end of the printing form must be fixed between the bar and the clamping body, tensile stresses occur in the printing form in the circumferential direction, which then cause an inadmissibly high elongation if the folding width is at the upper tolerance limit and the friction on the surface of the Cylinder is so high that the printing form does not slip when tensioned.

Die in der Patentschrift DE 26 20 427 C3 gezeigte Vorrichtung beinhaltet als federndes Element einen elastischen Klemmkörper, so daß zwar die Gefahr der Überdehnung gemildert ist, aber die Nachteile hinsichtlich besagter Kerbwirkung und Handhabung erhalten bleiben.The device shown in the patent DE 26 20 427 C3 contains as a resilient element an elastic clamping body, so that the risk of overstretching is alleviated is, but the disadvantages regarding said notch effect and handling remain.

Die Offenlegungsschrift DT 22 35 119 beinhaltet eine Lösung, bei der auf der Spannwelle eine doppellagige Blattfeder radial befestigt ist, deren Enden in tangentialer Richtung abgewinkelt sind. Beim Drehen der Spannwelle greift ein Blattfedernende in das hakenförmig ausgebildete, nachlaufende Ende der Druckform ein. Nachteilig ist neben schon erwähnter Kerbwirkung noch die Tatsache, daß das nachlaufende Ende doppelt abgekantet werden muß. Das stellt einen zusätzlichen Aufwand dar, wobei die zweite im stumpfen Winkel vorgenommene Abkantung keine reproduzierbare Spannung der Druckplatte bei deren Wiederverwendung gewährleistet.The published patent document DT 22 35 119 contains a solution in which a double-layer leaf spring is attached radially to the tensioning shaft, the ends of which are angled in the tangential direction. When the tensioning shaft is rotated, a leaf spring end engages in the hook-shaped trailing end of the printing form. In addition to the notch effect already mentioned, another disadvantage is the fact that the trailing end must be folded twice. This represents an additional effort, the second bend being made at an obtuse angle not guaranteeing reproducible tension of the printing plate when it is reused.

Ähnliche Nachteile weist die Druckplattenspannvorrichtung nach der Patentschrift DE 21 16 570 C3 auf, bei dem kein federndes Element vorgesehen ist und die besagte zweite Abkantung erst beim Spannvorgang vorgenommen wird. Die Handhabung der Druckplatte bei einem wiederholten Spannvorgang wird dadurch stark beeinträchtigt.The printing plate tensioning device according to the patent specification DE 21 16 570 C3 has similar disadvantages, in which no resilient element is provided and the said second folding is only carried out during the tensioning process. The handling of the pressure plate in a repeated clamping process is greatly affected.

Die Kerbwirkung einer Einhängeleiste entsprechend der in der Offenlegungsschrift DE 40 35 627 A1 beschriebenen Lösung wird dadurch verringert, daß beim Spannen die Einhängeleiste gegen eine Druckfeder wirkt. Es bleiben aber die Nachteile hinsichtlich der Handhabbarkeit einer zweifach im spitzen Winkel abgekanteten Druckform.The notch effect of a hanging bar according to the solution described in the published patent application DE 40 35 627 A1 is reduced by the fact that the hanging bar acts against a compression spring during tensioning. However, there remain the disadvantages with regard to the handling of a printing form that is folded twice at an acute angle.

Bei der Vorrichtung, welche in der Patentschrift DT 20 17 416 offenbart ist, sind für die beiden im spitzen Winkel vorabgekanteten Enden einer Druckform je eine Spannleiste auf je einer Spannwelle vorgesehen, wobei sich die Spannleisten gegen Druckfedern abstützen.In the device which is disclosed in the patent specification DT 20 17 416, one clamping bar is provided on each clamping shaft for the two ends of a printing form which are pre-folded at an acute angle, the clamping bars being supported against compression springs.

Nachteilig hierbei ist, daß zwei Spannleisten und zwei Spannwellen mit jeweils gesonderten Antrieben benötigt werden, was einen erhöhten Aufwand bedingt. Die Aufnahme des vorlaufenden Endes der Druckform mittels einer gefederten Spannleiste verursacht eine schwimmende Befestigung der Druckform auf dem Zylinder, was sich nachteilig auf die Druckqualität auswirken kann.The disadvantage here is that two tensioning strips and two tensioning shafts, each with separate drives, are required, which requires increased effort. The inclusion of the leading end of the printing form by means of a spring-loaded clamping bar causes the printing form to float on the cylinder, which can have an adverse effect on the print quality.

Bei dem in der Patentschrift DE 27 57 552 C2 gezeigten Formzylinder, welcher auf seinem Umfang zwei Druckformen aufnimmt, sind die nachlaufenden Enden der Druckform mit Bohrungen versehen und in kammartige, federnde Elemente eingehängt. Die federnden Elemente sind mit je einer Spannwelle formschlüssig verbunden. Ungünstig ist, daß das Einführen der federnden Elemente in die Bohrungen schwierig ist und daß durch die Spannkräfte die Leibung in den Bohrungen zunimmt, so daß sich die Spannverhältnisse ändern oder die Druckplatte in den Bohrungen rissig wird und unbrauchbar wird.In the forme cylinder shown in patent specification DE 27 57 552 C2, which accommodates two printing forms on its circumference, the trailing ends of the printing form are provided with bores and suspended in comb-like, resilient elements. The resilient elements are each positively connected to a tension shaft. It is unfavorable that the insertion of the resilient elements into the holes is difficult and that the reveal in the holes increases due to the clamping forces, so that the clamping conditions change or the pressure plate in the holes becomes cracked and unusable.

Gemäß der Vorrichtung in der Patentschrift DE 40 05 093 C1 werden die beiden im Kanal eingelegten Enden einer Druckform durch die rauhe Oberfläche einer exzentrisch gelagerten Spannwelle entlang einer Wand des Kanals eingezogen und mittels einer Tellerfeder fixiert. Bei dieser Lösung wird die Druckform mechanisch so stark beansprucht, daß eine Mehrfachbenutzung in Frage gestellt ist.According to the device in patent specification DE 40 05 093 C1, the two ends of a printing form inserted in the channel are drawn in through the rough surface of an eccentrically mounted tensioning shaft along a wall of the channel and fixed by means of a plate spring. With this solution, the printing form is mechanically stressed to such an extent that multiple use is called into question.

Eine weitere Vorrichtung zum Befestigen einer biegsamen Druckplatte beinhaltet drei Spannwellen, die koaxial angeordnet sind und unabhängig voneinander drehbar sind. An der inneren Vollwelle und der inneren Hohlwelle sind jeweils Klemmleisten befestigt. An der äußeren Hohlwelle ist eine Spannleiste angeschraubt. Die Klemmleisten gestatten eine voneinander unabhängige Klemmung der beiden Enden der Druckplatte und mit Hilfe der Spannleiste eine zusätzliche Spannung des nachlaufenden Endes der Druckplatte. Durch Druckfedern, welche zwischen den Klemmleisten angebracht sind, wird erreicht, daß eine gleichmäßige Klemmkraft auf das nachlaufende Ende der Druckplatte ausgeübt wird. Bei dieser Lösung gestaltet sich das Einführen des nachlaufenden Endes problematisch, weil eine Vielzahl von Spalten vorhanden sind, die die Druckplatte aufnehmen können. Desweiteren ist die Lösung durch die drei Spannwellen und zwei Klemmleisten und der Spannleiste mit den jeweiligen Betätigungselementen material- und kostenaufwendig.Another device for fastening a flexible pressure plate includes three clamping shafts which are arranged coaxially and can be rotated independently of one another. Terminal strips are attached to the inner solid shaft and the inner hollow shaft. A clamping bar is screwed onto the outer hollow shaft. The clamping strips allow the two ends of the pressure plate to be clamped independently of one another and, with the aid of the clamping strip, an additional one Tension of the trailing end of the pressure plate. Pressure springs, which are attached between the clamping strips, ensure that a uniform clamping force is exerted on the trailing end of the pressure plate. With this solution, the insertion of the trailing end is problematic because there are a large number of gaps that can accommodate the printing plate. Furthermore, the solution is costly in terms of material and costs due to the three clamping shafts and two clamping strips and the clamping strip with the respective actuating elements.

Aufgabe der Erfindung ist es, eine Aufspannvorrichtung zur Befestigung einer biegsamen Druckform auf der Mantelfläche eines Zylinders zu entwickeln, welche mit geringem Aufwand zu fertigen ist, welche ein schnelles Spannen mit geringem Kraftaufwand ermöglicht und welche die Druckform nur gering beansprucht, so daß eine Mehrfachverwendung möglich ist.The object of the invention is to develop a clamping device for fastening a flexible printing form on the lateral surface of a cylinder, which can be produced with little effort, which enables quick clamping with little effort and which only requires little pressure on the printing form, so that multiple use is possible is.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß an einer im Kanal eines Zylinders angeordneten Spannwelle ein federndes Element mit zwei Schenkeln befestigt ist, wobei im ungespannten Zustand der in Drehrichtung des Zylinders gesehen, nachlaufende erste Schenkel frei in den Kanal ragt und der andere Schenkel den ersten Schenkel in radialer Richtung überragt. Desweiteren besteht die Lösung darin, daß das nachlaufende Ende der Druckform, welches in einem stumpfen Winkel abgekantet ist, an einer axial verlaufenden Kante anliegt, die Bestandteil der nachlaufenden Seitenfläche des Kanals ist.The object is achieved in that a resilient element with two legs is attached to a tension shaft arranged in the channel of a cylinder, the trailing first leg seen in the direction of rotation of the cylinder protruding freely into the channel and the other leg the first leg Leg protrudes in the radial direction. Furthermore, the solution is that the trailing end of the printing form, which is bent at an obtuse angle, rests against an axially extending edge which is part of the trailing side surface of the channel.

Durch das federnde Element ist eine selbsttätige Nachspannung der Druckform gewährleistet. Die Aufspannvorrichtung benötigt nur wenige Bauteile und einen geringen Bauraum, so daß der kanalbedingte druckfreie Rand des Plattenzylinders auf zwei Millimeter reduziert werden kann. Die Aufspannvorrichtung läßt sich sowohl für Zylinder mit einfachem Durchmesser als auch für Zylinder mehrfachen Durchmessers realisieren, wobei dann jeder Druckform, die auf dem Zylinder aufgespannt werden soll, eine derartige Aufspannvorrichtung zugeordnet ist.The resilient element ensures automatic re-tensioning of the printing form. The clamping device requires only a few components and a small installation space, so that the channel-related pressure-free edge of the plate cylinder can be reduced to two millimeters. The clamping device can be used both for cylinders with a simple diameter also realize for cylinders of multiple diameters, such a clamping device then being assigned to each printing form which is to be clamped on the cylinder.

Desweiteren kann die Aufspannung schnell und mit wenig Kraftaufwand erfolgen, so daß bei einer handbetätigten Aufspannung die Aufspannvorrichtung von nur einer Person wahlweise von der Antriebs- oder der Bedienseite der Druckmaschine bedient werden kann. Die Aufspannung wird bereits durch eine 10° Drehung der Spannwelle erreicht.Furthermore, the clamping can be done quickly and with little effort, so that with a manually operated clamping the clamping device can be operated by only one person either from the drive or the operating side of the printing press. The clamping is already achieved by a 10 ° rotation of the tension shaft.

Der zweite Schenkel kann vorteilhaft in Richtung des nachlaufenden Endes der Druckform abgerundet sein und im ungespannten Zustand an der vorlaufenden Seitenfläche anliegen. Wenn die Seitenwände des Kanals wie üblich hinterschnitten ausgeführt sind, dann behindern die Schenkel in keiner Weise das Einführen des nachlaufenden Endes der Druckform. Aus dem gleichen Grund ist es vorteilhaft, wenn die Enden der Schenkel zueinander geneigt angeordnet sind.The second leg can advantageously be rounded in the direction of the trailing end of the printing form and can rest on the leading side surface in the untensioned state. If the side walls of the channel are undercut as usual, then the legs in no way hinder the insertion of the trailing end of the printing form. For the same reason, it is advantageous if the ends of the legs are arranged inclined to one another.

Einen besonders geringen Aufwand erzielt man dann, wenn die federnden Elemente jeweils aus einem einzigen U-förmigen blattfedernartigen Teil bestehen, welches mit seinem Steg auf der Grundfläche einer rechteckförmigen, axial verlaufenden Nut der Spannwelle befestigt ist, wobei der erste Schenkel des federnden Elementes in einem Teilbereich im ungespannten Zustand an der Seitenfläche der rechteckförmigen Nut anliegt.A particularly low effort is achieved if the resilient elements each consist of a single U-shaped leaf spring-like part, which is attached with its web to the base of a rectangular, axially extending groove of the tensioning shaft, the first leg of the resilient element in one Partial area is in the untensioned state on the side surface of the rectangular groove.

Um eine günstige Handhabung beim Einführen des nachlaufenden Endes der Druckform zu gewährleisten, sollte die Breite der Nut der Spannwelle größer sein, als die größte Weite des Kanals, wobei im ungespannten Zustand der Kanal in die Nut mündet.In order to ensure favorable handling when inserting the trailing end of the printing form, the width of the groove of the tensioning shaft should be larger than the greatest width of the channel, the channel opening into the groove in the untensioned state.

Ein Ausührungsbeispiel der Erfindung soll anhand einer Zeichung noch näher erläutert werden; es zeigen:

Fig. 1
eine Aufspannvorrichtung im gelösten Zustand;
Fig. 2
eine Zwischenstufe des Spannvorganges; und
Fig. 3
die Aufspannvorrichtung im voll betätigten Zustand.
An embodiment of the invention will be explained in more detail with reference to a drawing; show it:
Fig. 1
a jig in the released state;
Fig. 2
an intermediate stage of the tensioning process; and
Fig. 3
the clamping device in the fully actuated state.

Fig. 1 zeigt einen Plattenzylinder 1 mit einem trapezförmigen Kanal 2 zur Aufnahme der Enden 3, 4 einer Druckform 5. Das beim Druck vorlaufende Ende 3 ist im spitzen Winkel abgekantet und in eine rechteckförmige Nut 6 eingelegt, deren Neigungswinkel zu einer in Kanalmitte verlaufenden Tangentialebene im wesentlichen dem Abkantwinkel entspricht. Die schlitzförmige Nut 6 mündet in den peripheren Bereich des Kanals 2. Das nachlaufende Ende 4 ist stumpfwinklig abgekantet und in den Kanal 2 eingeführt. Die Abkantbreite des Endes 4 ist größer gewählt als die des Endes 3. Zum Aufspannen der Druckform 5 auf den Plattenzylinder 1 ist im Plattenzylinder 1 eine Spannwelle 7 drehbar angeordnet, deren Drehachse parallel zur Achse des Zylinders 1 liegt. Längs der Spannwelle 7 ist eine rechteckförmige Nut 8 eingearbeitet, die breiter als die größte Weite des Kanals 2 ist und deren Öffnung dem Kanal 2 zugewandt liegt. Über die Breite des Plattenzylinders 1 sind auf der Grundfläche 9 der Nut 8 mit ihrem Steg 10 mehrere U-förmige Blattfedernelemente 11 mittels einer Schraube 12 und einer Mutter 13 befestigt. Die Blattfedernelemente 11 weisen neben ihrem Steg 10 zwei Schenkel 14, 15 auf, die in ihrem Endbereich jeweils abgewinkelt sind, so daß die Endstücke 16, 17 der Schenkel 14, 15 zueinander geneigt liegen. Im gelösten Zustand der Aufspannung liegt der Schenkel 14 in seinem unteren Bereich vollflächig an der Seitenwand 18 an und das Endstück 16 ragt frei in den unteren Bereich des Kanals 2. Der Schenkel 15 überragt mit seinem Endstück 17 das Endstück 16 des Schenkels 14, wobei das Endstück 17 mit einer Rundung 19 ausläuft und im gelösten Zustand der Aufspannung an der vorlaufenden Seitenwand 20 des Kanals 2 aufliegt.Fig. 1 shows a plate cylinder 1 with a trapezoidal channel 2 for receiving the ends 3, 4 of a printing plate 5. The end 3 which is leading during printing is bent at an acute angle and inserted into a rectangular groove 6, the angle of inclination of which extends to a tangential plane running in the center of the channel corresponds essentially to the folding angle. The slot-shaped groove 6 opens into the peripheral region of the channel 2. The trailing end 4 is bent at an obtuse angle and inserted into the channel 2. The folding width of the end 4 is chosen to be larger than that of the end 3. To clamp the printing form 5 onto the plate cylinder 1, a clamping shaft 7 is rotatably arranged in the plate cylinder 1, the axis of rotation of which lies parallel to the axis of the cylinder 1. A rectangular groove 8 is machined along the tension shaft 7, which is wider than the greatest width of the channel 2 and the opening of which is facing the channel 2. Across the width of the plate cylinder 1, several U-shaped leaf spring elements 11 are fastened to the base 9 of the groove 8 with their web 10 by means of a screw 12 and a nut 13. The leaf spring elements 11 have in addition to their web 10 two legs 14, 15, which are each angled in their end region, so that the end pieces 16, 17 of the legs 14, 15 are inclined to each other. In the released state of the clamping, the leg 14 lies in its lower area over the entire surface of the side wall 18 and the end piece 16 projects freely into the lower area of the channel 2. The leg 15 projects beyond the end piece 16 of the leg 14 with its end piece 17 End piece 17 with a curve 19 runs out and rests on the leading side wall 20 of the channel 2 in the released state of the clamping.

Durch Drehung der Spannwelle 7 um ihre Achse in Richtung 21 kann die Druckplatte 5 auf den Zylinder 1 gespannt werden. Durch Zurückdrehen in Richtung 22 kann die Aufspannung wieder gelöst werden.By rotating the tension shaft 7 about its axis in direction 21, the pressure plate 5 can be tensioned on the cylinder 1. By turning back in direction 22 the clamping can be released again.

Wie Fig. 2 zu entnehmen ist, wird in der ersten Phase der Aufspannung zuerst durch das Endstück 16 das nachlaufende Ende 4 der Druckform 5 gegen eine Kante 23 gepreßt, welche durch die vorlaufende Seitenwand 24 und die Innenzylinderfläche 25 der Bohrung für die Spannwelle 7 im Plattenzylinder 1 gebildet wird. Dabei kann das Ende 4 über die Kante 23 leicht abgebogen werden.As can be seen in FIG. 2, the trailing end 4 of the printing form 5 is first pressed by the end piece 16 against an edge 23 in the first phase of the clamping, which end is pressed through the leading side wall 24 and the inner cylindrical surface 25 of the bore for the tensioning shaft 7 in Plate cylinder 1 is formed. The end 4 can be bent slightly over the edge 23.

In einer weiteren Phase der Aufspannung drückt, wie in Fig. 3 gezeigt, das Endstück 17 mit der konkaven Wölbung der Rundung 19 gegen die Innenfläche des Endes 4 der Druckform 5, wobei auf die Druckform 5 in tangentialer Richtung eine Zugspannung ausgeübt wird. Das für die Spannung der Druckform 5 benötigte Drehmoment an der Spannwelle 7 steht permanent an und kann mit Hilfe von Spiralfedern aufgebracht werden. Die Verdrehung der Spannwelle 7 kann ferngesteuert erfolgen.In a further phase of the clamping, as shown in FIG. 3, the end piece 17 with the concave curvature of the curve 19 presses against the inner surface of the end 4 of the printing forme 5, tensile stress being exerted on the printing forme 5 in the tangential direction. The torque required for the tensioning of the printing form 5 on the tensioning shaft 7 is permanently present and can be applied with the aid of spiral springs. The tensioning shaft 7 can be rotated by remote control.

BezugszeichenlisteReference list

11
PlattenzylinderPlate cylinder
22nd
Kanalchannel
33rd
EndeThe End
44th
EndeThe End
55
DruckformPrinting form
66
NutGroove
77
SpannwelleTension shaft
88th
NutGroove
99
GrundflächeFloor space
1010th
Stegweb
1111
BlattfederelementLeaf spring element
1212th
Schraubescrew
1313
Muttermother
1414
Schenkelleg
1515
Schenkelleg
1616
EndstückTail
1717th
EndstückTail
1818th
SeitenwandSide wall
1919th
RundungRounding
2020th
SeitenwandSide wall
2121
Richtungdirection
2222
Richtungdirection
2323
KanteEdge
2424th
SeitenwandSide wall
2525th
InnenzylinderflächeInner cylinder surface

Claims (6)

Aufspannvorrichtung zum Befestigen einer biegsamen Druckform auf der Mantelfläche eines Zylinders, - bei der das vorlaufende Ende der Druckform in einer entlang einer Mantellinie verlaufenden Nut eines Zylinders gehalten ist, - bei der das in einem stumpfen Winkel abgebogene nachlaufende Ende der Druckform in einem in die Mantelfläche eingearbeiteten achsparallelen Kanal eingelegt ist, - wobei eine derehbare, achsparallele Spannwelle vorgesehen ist, mit der mindestens ein federndes Element, welches an der Spannwelle befestigt ist, gegen das nachlaufende Ende der Druckform beweglich ist,
dadurch gekennzeichnet, - daß das nachlaufende Ende (4) der Druckform (5) ab einer Kante (23) anliegt, die Bestandteile der vorlaufenden Seitenfläche (24) des Kanals (2) ist, und - daß die federnden Elemente (11) zwei Schenkel (14, 15) aufweisen, wobei im ungespannten Zustand der eine Schenkel (14, 16) frei in den Kanal (2) ragt. Clamping device for attaching a flexible printing form to the outer surface of a cylinder, in which the leading end of the printing form is held in a groove of a cylinder running along a surface line, in which the trailing end of the printing plate, which is bent at an obtuse angle, is inserted in an axially parallel channel machined into the lateral surface, a removable, axially parallel tensioning shaft is provided with which at least one resilient element, which is fastened to the tensioning shaft, is movable against the trailing end of the printing form,
characterized by - That the trailing end (4) of the printing form (5) abuts an edge (23) which is part of the leading side surface (24) of the channel (2), and - That the resilient elements (11) have two legs (14, 15), with one leg (14, 16) freely projecting into the channel (2) in the untensioned state. Aufspannvorrichtung nach Anspruch 1,
dadurch gekennzeichnet, - daß der zweite Schenkel (15) in Richtung des nachlaufenden Endes (4) der Druckform(5) eine Abrundung (19) aufweist. Clamping device according to claim 1,
characterized by - That the second leg (15) in the direction of the trailing end (4) of the printing form (5) has a rounding (19). Aufspannvorrichtung nach Anspruch 1 bis 2,
dadurch gekennzeichnet, - daß der zweite Schenkel (15, 17) an der vorlaufenden Seitenfläche (20) des Kanals (2) federvorgespannt anliegt. Clamping device according to claim 1 to 2,
characterized by - That the second leg (15, 17) rests on the leading side surface (20) of the channel (2) spring biased. Aufspannvorrichtung nach Anspruch 1 bis 3,
dadurch gekennzeichnet, - daß die Enden (16, 17) der Schenkel (14, 15) zueinander geneigt sind. Clamping device according to claims 1 to 3,
characterized by - That the ends (16, 17) of the legs (14, 15) are inclined to each other. Aufspannvorrichtung nach Anspruch 1 bis 4,
dadurch gekennzeichnet, - daß die federnden Elemente (11) aus jeweils einem U-förmigen blattfedernartigen Teil bestehen, welches mit seinem Steg (10) auf der Grundfläche (9) einer rechteckförmigen Nut (8) der Spannwelle (7) befestigt ist, - wobei der erste Schenkel (14) des federnden Elements (11) in ungespanntem Zustand an der Seitenfläche (18) der rechteckförmigen Nut (8) anliegt. Clamping device according to claim 1 to 4,
characterized by - That the resilient elements (11) each consist of a U-shaped leaf spring-like part, which is fixed with its web (10) on the base (9) of a rectangular groove (8) of the tensioning shaft (7), - The first leg (14) of the resilient element (11) in the untensioned state on the side surface (18) of the rectangular groove (8). Aufspannvorrichtung nach Anspruch 1 bis 5,
dadurch gekennzeichnet,
daß der Kanal (2) in die Nut (8) mündet.Clamping device according to claim 1 to 5,
characterized by
that the channel (2) opens into the groove (8).
EP93115536A 1992-10-12 1993-09-27 Clamping device for fixing a flexible printing forme onto the surface of a cylinder Expired - Lifetime EP0592856B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4234332A DE4234332A1 (en) 1992-10-12 1992-10-12 Clamping device for attaching a flexible printing form to the outer surface of a cylinder
DE4234332 1992-10-12

Publications (2)

Publication Number Publication Date
EP0592856A1 true EP0592856A1 (en) 1994-04-20
EP0592856B1 EP0592856B1 (en) 1997-01-08

Family

ID=6470254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115536A Expired - Lifetime EP0592856B1 (en) 1992-10-12 1993-09-27 Clamping device for fixing a flexible printing forme onto the surface of a cylinder

Country Status (4)

Country Link
US (1) US5423258A (en)
EP (1) EP0592856B1 (en)
JP (1) JPH06191016A (en)
DE (2) DE4234332A1 (en)

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US5778786A (en) * 1995-07-25 1998-07-14 Heidelberger Druckmaschinen Ag Plate clamping device for reducing the non-printing region

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DE29600845U1 (en) * 1996-01-19 1996-03-07 Roland Man Druckmasch Device for fastening a covering on a printing unit cylinder
DE19841912A1 (en) * 1998-09-14 2000-03-16 Roland Man Druckmasch Mounting for flexible printing plates at the plate cylinder of a rotary printing press has recesses at the flanks of the cylinder channel with leaf springs to push the bent plate ends into them
EP1038672B1 (en) * 1999-03-26 2003-12-03 Heidelberger Druckmaschinen Aktiengesellschaft Device for tensioning of printing plates in lock-up gaps having a reduced size
JP4666707B2 (en) * 1999-12-21 2011-04-06 株式会社ミヤコシ Plate quick holding device in plate cylinder
DE102004034049A1 (en) * 2004-07-13 2006-02-09 Man Roland Druckmaschinen Ag Form cylinder of a web-fed rotary printing machine
DE102009047674A1 (en) * 2009-12-08 2011-06-09 Manroland Ag Printing unit of a printing press and method for changing at least one printing plate on such a printing unit

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Also Published As

Publication number Publication date
EP0592856B1 (en) 1997-01-08
JPH06191016A (en) 1994-07-12
US5423258A (en) 1995-06-13
DE59305047D1 (en) 1997-02-20
DE4234332A1 (en) 1994-04-14

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