EP0179148A1 - Clamping device for printing plates for printing machines. - Google Patents

Clamping device for printing plates for printing machines.

Info

Publication number
EP0179148A1
EP0179148A1 EP85902499A EP85902499A EP0179148A1 EP 0179148 A1 EP0179148 A1 EP 0179148A1 EP 85902499 A EP85902499 A EP 85902499A EP 85902499 A EP85902499 A EP 85902499A EP 0179148 A1 EP0179148 A1 EP 0179148A1
Authority
EP
European Patent Office
Prior art keywords
shaft
printing
clamping device
torsion bar
clamping
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
EP85902499A
Other languages
German (de)
French (fr)
Other versions
EP0179148B1 (en
Inventor
Klaus Guthling
Adolf Meyer
Manfred Miethe
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.)
FA WILHELM BARENSCHEE
Original Assignee
FA WILHELM BARENSCHEE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FA WILHELM BARENSCHEE filed Critical FA WILHELM BARENSCHEE
Publication of EP0179148A1 publication Critical patent/EP0179148A1/en
Application granted granted Critical
Publication of EP0179148B1 publication Critical patent/EP0179148B1/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B41F27/125—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 on a curvilinear path, e.g. by winding on a roll

Definitions

  • the invention relates to a clamping device for cylinders for flexible printing plates or printing blankets on printing presses, which are provided at their ends with bevels or reinforcement angles which can be fastened to a slotted shaft, the shaft being prestressed by means of a torsion bar spring.
  • Known cylinders contain fastening parts for printing plates in their interior. Due to the weakening of the effective cross-section of the cylinder, these relatively large-sized fastening parts reduce the strength of the cylinder, so that the rotary motion is deteriorated overall in the printing process.
  • Known methods for quickly mounting printing plates on printing cylinders enable rapid attachment, but accept the lower quality of the printed product due to the lower strength of the plate cylinder.
  • printing plates which consist of a carrier plate made of metal (steel, aluminum or the like) or a corresponding plastic and a photopolymer layer, the printing plate is in turn attached to the saddle plate.
  • a carrier plate made of metal (steel, aluminum or the like) or a corresponding plastic and a photopolymer layer
  • the printing plate is in turn attached to the saddle plate.
  • Such devices are known.
  • Has plate cylinder namely so that the head of a printing plate can be attached in the right direction. If the tensioning shaft has not been installed in this way, the entire insert, which includes the torsion tensioning spring and also the tensioning shaft, is pulled out and rotated and reinserted by 180 °.
  • the invention is concerned with the problem of avoiding this conversion, which is undesirable per se.
  • the tensioning device could be fastened by means of Allen screws which are screwed into the pressure cylinder from the outer circumference.
  • Allen screws which are screwed into the pressure cylinder from the outer circumference.
  • the countersunk space for the head of the screws must be filled in using a plastic plug. If the insert is to be removed later, then it is quite cumbersome to remove the plastic plug again. Therefore, in one embodiment of the tensioning device according to the invention, the tensioning device itself is fastened to the pressure cylinder by a screw which is located in the inner region of the tensioning device facility is located. At this point, however, the screw would not be accessible if the shaft itself were not provided with a correspondingly large through hole.
  • the invention is explained below with reference to the drawing, for example.
  • FIG. 2 shows a corresponding illustration on an enlarged scale, pressure plates also being shown in the clamping position.
  • 3 shows a modified embodiment of a tensioning device according to the invention.
  • Fig. 4 shows details of that shown in Fig. 3
  • 20 denotes the recess in a plate cylinder.
  • An insert or the device referred to overall as a clamping device fits into this recess.
  • the tensioning device comprises a shaft 10 and the torsion spring 13.
  • the tensioning shaft is provided with two slots 11 and 12, which are arranged symmetrically to the central position of the shaft. With 20 is the opening through which access to the tension shaft 10 is possible.
  • At 14 and 15 there are two
  • Pressure plates referred to which have angular parts at their end that can be fixed on corresponding parts. One end is attached directly to the pressure cylinder, while the other end is secured in one of the slots 11 or 12 of the slot shaft 10.
  • Fig. 1 it can also be seen that with the help of suitable tools and by a pivoting movement, the shaft 10 can be pivoted against the action of the force of the torsion bar spring 13.
  • the screw can be seen on the left, with the help of which the clamping device is attached to the pressure cylinder.
  • FIG. 4 shows the shaft 10, which has a through hole 30. If the shaft is in the central position 10, a screw can be turned with a suitable tool through this through hole 30, which is located in a countersink hole 31 and fastens the clamping device to the pressure cylinder.
  • FIG. 3 shows how the force of the torsion bar spring 13 can be transmitted to the shaft 10.
  • a gear or toothed segment 32 is attached to the shaft, which meshes with another gear 33.
  • the gear 33 is fixed to one end of the torsion bar spring 13.
  • the shaft can be tensioned via the torsion bar spring 13 and the gear parts 32 and 33.
  • the gear 33 can be chosen to be somewhat smaller in diameter in order to create a more space-saving embodiment.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

Dispositif de serrage pour des cylindres afin de serrer des planches d'impression pliables ou des blanchets à des imprimeuses qui sont dotées à leurs extrémités de replis ou d'angles de renfort pouvant être fixés à un arbre fendu, l'arbre étant serré au moyen d'un ressort de barre de torsion. L'arbre (10) comporte deux fentes (11, 12) opposées mutuellement.A clamping device for cylinders for clamping foldable printing boards or blankets to printers which are provided at their ends with folds or reinforcing angles which can be attached to a split shaft, the shaft being clamped by means of a torsion bar spring. The shaft (10) has two mutually opposed slots (11, 12).

Description

Spanneinrichtung für Druckplatten und Drucktücher an Druckmaschinen Clamping device for printing plates and printing blankets on printing machines
Die Erfindung bezieht sich auf eine Spanneinrichtung für Zylinder für biegsame Druckplatten oder Drucktücher an Druckmaschinen, welche an ihren Enden mit Abkantungen oder Verstärkungswinkeln versehen sind, die an einer geschlitzten Welle befestigbar sind, wobei die Welle vermittels einer Torsionsstabfeder vorgespannt ist.The invention relates to a clamping device for cylinders for flexible printing plates or printing blankets on printing presses, which are provided at their ends with bevels or reinforcement angles which can be fastened to a slotted shaft, the shaft being prestressed by means of a torsion bar spring.
Bekannte Zylinder enthalten in ihrem Inneren Befestigungsteile für Druckplatten. Diese relativ großdimensionierten Befestigungsteile verringern auf Grund der Schwächung des wirksamen Querschnitts der Zylinder die Festigkeit des Zylinders, so daß insgesamt im Druckverfahren der Rundlaüf verschlechtert wird. Bekannte Verfahren, um Druckplatten schnell auf Druckzylinder aufzuspannen, ermöglichen zwar eine schnelle Befestigung, nehmen jedoch die geringere Qualität des Druckerzeugnisses infolge geringerer Festigkeit des Plattenzylinders in Kauf.Known cylinders contain fastening parts for printing plates in their interior. Due to the weakening of the effective cross-section of the cylinder, these relatively large-sized fastening parts reduce the strength of the cylinder, so that the rotary motion is deteriorated overall in the printing process. Known methods for quickly mounting printing plates on printing cylinders enable rapid attachment, but accept the lower quality of the printed product due to the lower strength of the plate cylinder.
Bei Verwendung von Druckplatten, die aus einem Tragblech aus Metall ( Stahl, Aluminium oder dergl. ) oder einem entsprechenden Kunststoff und einer Fotopolymerschicht bestehen, wird die Druckplatte ihrerseits an der Sattelplatte befestigt. Derartige Vorrichtungen sind bekannt.When using printing plates, which consist of a carrier plate made of metal (steel, aluminum or the like) or a corresponding plastic and a photopolymer layer, the printing plate is in turn attached to the saddle plate. Such devices are known.
(Deutsche Patentschrift 22 07 138). Es kommt vor, daß je nach Einsatz der Plattenzylinder die eine oder die andere Umdrehungsrichtung des Plattenzylinders gewünscht wird. Wenn in diesem Fall Druckplatten befestigt werden sollen, kommt es darauf an, daß die Spannwellen die richtige Lage in der Ausnehmung des(German patent specification 22 07 138). It happens that depending on the use of the plate cylinder, one or the other direction of rotation of the plate cylinder is desired. If pressure plates are to be attached in this case, it is important that the tensioning shafts are in the correct position in the recess of the
Plattenzylinders aufweist, nämlich so, daß der Kopf einer Druckplatte in der richtigen Richtung befestigt werden kann. Ist die Spannwelle nicht auf diese Art und Weise eingebaut worden, so wird der gesamte Einsatz, der die Torsionsspannfeder und auch die Spannewelle umfaßt, herausgezogen und um 180° gedreht-wieder eingesetzt.Has plate cylinder, namely so that the head of a printing plate can be attached in the right direction. If the tensioning shaft has not been installed in this way, the entire insert, which includes the torsion tensioning spring and also the tensioning shaft, is pulled out and rotated and reinserted by 180 °.
Die Erfindung befaßt sich mit dem Problem, diese an und für sich nicht erwünschte Umrüstung zu vermeiden.The invention is concerned with the problem of avoiding this conversion, which is undesirable per se.
Gelöst wird dies durch eine Plattenzylindranordnung nach dem Patentanspruch.This is solved by a plate cylinder arrangement according to the claim.
Mit Hilfe der in zwei Richtungen geschlitzten Welle ist es jederzeit möglich, eine Druckplatte so einzuspannen, daß die Einspannung mit der Umdrehung übereinstimmt. Gleichzeitig kann die erforderliche Vorspannung eingestellt werden, da bekanntlich eine Torsionsfeder sowohl in der einen als auch in der anderen Umdrehungsrichtung beansprucht werden kann.With the help of the shaft slotted in two directions, it is possible at any time to clamp a pressure plate in such a way that the clamping coincides with the rotation. At the same time, the required pretension can be set, since it is known that a torsion spring can be stressed both in one and in the other direction of rotation.
Die Spanneinrichtung gemäß der Erfindung hat den Vorteil, daß die Druckplatten während des Druckvorganges über die Krafteinwirkung der Torsionsstabfeder ständig inThe tensioning device according to the invention has the advantage that the pressure plates are constantly in during the printing process due to the force of the torsion bar spring
Umfangsrichtung gespannt sind. Bei der Frage, wie die Spanneinrichtung an dem Druckzylinder zu befestigen ist, können zwei Lösungen angeboten werden. Man könnte die Spanneinrichtung vermittels von Innensechskantschrauben befestigen, welche vom Außenumfang her in den Druckzylinder eingeschraubt werden. Hier muß allerdings dann der angesenkte Raum für den Kopf der Schrauben mittels eines Kunststoffpfropfens ausgefüllt werden. Soll der Einsatz dann später einmal entfern werden, so ist es recht mühselig, den Kunststoffpfropfen wieder zu entfernen. Daher wird bei einer Ausführungsform der Spanneinrichtung gemäß der Erfindung die Spanneinrichtung selbst durch eine Schraube am Druckzylinder befestigt, die sich im inneren Bereich der Spann einrichtung befindet. An dieser Stelle wäre jedoch die Schraube nicht erreichbar, wenn nicht die Welle selbst mit einem entsprechend großen Durchgangsloch versehen wäre. Die Erfindung wird nachstehend anhand der Zeichnung beispielsweise erläutert.Are circumferential tensioned. When it comes to the question of how the clamping device is to be attached to the printing cylinder, two solutions can be offered. The tensioning device could be fastened by means of Allen screws which are screwed into the pressure cylinder from the outer circumference. Here, however, the countersunk space for the head of the screws must be filled in using a plastic plug. If the insert is to be removed later, then it is quite cumbersome to remove the plastic plug again. Therefore, in one embodiment of the tensioning device according to the invention, the tensioning device itself is fastened to the pressure cylinder by a screw which is located in the inner region of the tensioning device facility is located. At this point, however, the screw would not be accessible if the shaft itself were not provided with a correspondingly large through hole. The invention is explained below with reference to the drawing, for example.
Fig, 1 zeigt eine Querschnittsansicht durch eine1 shows a cross-sectional view through a
Ausnehmung in einer Plattenzylinderanordnung mit einer Spannwelle gemäß der Erfindung. Fig. 2 zeigt an einem vergrößerten Maßstab eine entsprechende Darstellung, wobei auch Druckplatten in der Einspannlage gezeigt sind. Fig. 3 zeigt eine abgewandelte Ausführungsform einer Spanneinrichtung gemäß der Erfindung. Fig. 4 zeigt Einzelheiten zu der in Fig. 3 zeigtenRecess in a plate cylinder arrangement with a tension shaft according to the invention. 2 shows a corresponding illustration on an enlarged scale, pressure plates also being shown in the clamping position. 3 shows a modified embodiment of a tensioning device according to the invention. Fig. 4 shows details of that shown in Fig. 3
Spanneinrichtung.Clamping device.
In den Fig. ist mit 20 die Ausnehmung in einem Plattenzylinder bezeichnet. In diese Ausnehmung paßt ein Einsatz bzw. die insgesamt als Spanneinrichtung bezeichnete Einrichung. Die Spanneinrichtung umfaßt eine Welle 10 und die Torsionsfeder 13. Die Spannwelle ist gemäß der Erfindung mit zwei Schlitzen 11 und 12 versehen, die symmetrisch zur Mittellage der Welle angeordnet sind. Mit 20 ist die Öffnung bezeichnet, durch die ein Zugang zur Spannwelle 10 möglich ist. Mit 14 und 15 sind zweiIn the figures, 20 denotes the recess in a plate cylinder. An insert or the device referred to overall as a clamping device fits into this recess. The tensioning device comprises a shaft 10 and the torsion spring 13. According to the invention, the tensioning shaft is provided with two slots 11 and 12, which are arranged symmetrically to the central position of the shaft. With 20 is the opening through which access to the tension shaft 10 is possible. At 14 and 15 there are two
Druckplatten bezeichnet, die an Ihrem Ende Winkelteile aufweise die an entsprechenden Teilen festgelegt werden können. Das eine Ende wird direkt an dem Druckzylinder, während das andere Ende in e inem der Schlitze 11 oder 12 der Schlitzwelle 10 befestigt wird.Pressure plates referred to, which have angular parts at their end that can be fixed on corresponding parts. One end is attached directly to the pressure cylinder, while the other end is secured in one of the slots 11 or 12 of the slot shaft 10.
In Fig. 1 ist auch zu erkennen, daß mit Hilfe geeigneter Werkzeuge und durch eine Schwenkbewegung die Welle 10 gegen die Einwirkung der Kraft der Torsionsstabfeder 13 verschwenkt werden kann. In Fig. 1 ist linksseitig auch die Schraube zu erkennen, mit deren Hilfe die Spanneinrichtung am Druckzylinder befestigt wird.In Fig. 1 it can also be seen that with the help of suitable tools and by a pivoting movement, the shaft 10 can be pivoted against the action of the force of the torsion bar spring 13. In Fig. 1, the screw can be seen on the left, with the help of which the clamping device is attached to the pressure cylinder.
Die Fig. 3 und 4 zeigen eine abgewandelte Ausführungs- form der Erfindung, wobei jedoch gleiche Teile mit gleichen Bezugszahlen versehen sind.3 and 4 show a modified embodiment of the invention, but the same parts are provided with the same reference numbers.
In Fig.4 ist die Welle 10 zu erkennen, welche eine Durchgangsbohrung 30 aufweist. Steht die Welle in der Mittelstellung 10, so kann mit einem geeigneten Werkzeug durch diese Durchgangsbohrung 30 eine Schraube gedreht werden, die sich in einer Ansenkbohrung 31 befindet und die Spanneinrichtung an dem Druckzylinder befestigt.4 shows the shaft 10, which has a through hole 30. If the shaft is in the central position 10, a screw can be turned with a suitable tool through this through hole 30, which is located in a countersink hole 31 and fastens the clamping device to the pressure cylinder.
In Fig.3 ist gezeigt, wie die Kraft der Torsionsstabfeder 13 auf die Welle 10 übertragen werden kann. Zu diesem Zweck ist auf der Welle ein Zahnrad oder Zahnsegment 32 befestigt, welches mit einem anderen Zahnrad 33 kämmt. Das Zahnrad 33 ist an dem einen Ende der Torsionsstabfeder 13 befestigt. Auf diese Weise ist ersichtlich, daß mit Hilfe eines Werkzeuges, welches in eine Bohrung 40 eingeführt wird, eine Spannung der Welle über die Torsionsstabfeder 13 und die Zahnradteile 32 und 33 herbeigeführt werden kann. Für gewöhnlich ist keine Übersetzung der Kräfte zwischen den Zahnrädern 32 und 33 erforderlich, man kann jedoch das Zahnrad 33 etwas kleiner im Durchmesser wählen, um so eine platzmäßig günstigere Ausführungsform zu schaffen. 3 shows how the force of the torsion bar spring 13 can be transmitted to the shaft 10. For this purpose, a gear or toothed segment 32 is attached to the shaft, which meshes with another gear 33. The gear 33 is fixed to one end of the torsion bar spring 13. In this way it can be seen that with the aid of a tool which is introduced into a bore 40, the shaft can be tensioned via the torsion bar spring 13 and the gear parts 32 and 33. Usually there is no need to translate the forces between the gears 32 and 33, but the gear 33 can be chosen to be somewhat smaller in diameter in order to create a more space-saving embodiment.

Claims

Patentansprüche Claims
1. Spanneinrichtung für Zylinder zum Aufspannen von biegsamen Druckplatten oder Drucktüchern an Druckmaschinen, welche an ihren Enden mit Abkantungen oder Verstärkungswinkeln versehen sind, die an einer geschlitzten Welle befestigbar sind, wobei die Welle vermittels einer Torsionsstabfeder gespannt ist, dadurch gekennzeichnet, daß die Welle (10) zwei einander entgegengerichtete Schlitze (11, 12) aufweist.1.Clamping device for cylinders for clamping flexible printing plates or printing blankets on printing presses, which are provided at their ends with bevels or reinforcement angles which can be fastened to a slotted shaft, the shaft being tensioned by means of a torsion bar spring, characterized in that the shaft ( 10) has two mutually opposite slots (11, 12).
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Torsionsstabfeder (13) entweder innerhalb der Welle2. Device according to claim 1, characterized in that the torsion bar spring (13) either inside the shaft
(10) oder außerhalb der Welle (10) angeordnet ist, wobei in diesem Fall zur Übertragung der Spannkraft ein Getriebe (32,33), insbesondere ein Zahnradgetriebe vorgesehen ist.(10) or outside the shaft (10), in which case a transmission (32, 33), in particular a gear transmission, is provided for transmitting the clamping force.
3. Einrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Welle (10) mit einer Durchgangsbohrung (30) ausgebildet ist. 3. Device according to one of claims 1 or 2, characterized in that the shaft (10) is formed with a through hole (30).
EP85902499A 1984-05-02 1985-04-26 Clamping device for printing plates for printing machines Expired EP0179148B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3416187 1984-05-02
DE19843416187 DE3416187A1 (en) 1984-05-02 1984-05-02 PLATE CYLINDER ARRANGEMENT FOR FLEXIBLE PRINT PLATES

Publications (2)

Publication Number Publication Date
EP0179148A1 true EP0179148A1 (en) 1986-04-30
EP0179148B1 EP0179148B1 (en) 1989-01-18

Family

ID=6234780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85902499A Expired EP0179148B1 (en) 1984-05-02 1985-04-26 Clamping device for printing plates for printing machines

Country Status (5)

Country Link
US (1) US4641576A (en)
EP (1) EP0179148B1 (en)
JP (1) JPS62500848A (en)
DE (2) DE3416187A1 (en)
WO (1) WO1985005075A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8616952D0 (en) * 1986-07-11 1986-08-20 Hercules Inc Printing plate
DE3731779A1 (en) * 1987-09-22 1989-03-30 Koenig & Bauer Ag DEVICE FOR CLAMPING FLEXIBLE PRINTING PLATES ON FORM CYLINDERS OF ROTARY PRINTING MACHINES
DE4244077C2 (en) * 1992-12-24 1995-06-08 Koenig & Bauer Ag Device for clamping flexible printing plates on a forme cylinder of a rotary printing machine
US5413042A (en) * 1994-02-22 1995-05-09 Heidelberg Druckmaschinen Ag Lock-up assembly for securing a printing plate on a plate cylinder
DE4447436C2 (en) * 1994-12-29 1997-03-13 Prolux Maschinenbau Gmbh Method and device for the thermal treatment of fluorescent-coated glass vessels
DE19729375A1 (en) * 1997-07-09 1999-01-14 Ltg Lufttechnische Gmbh Device for fastening a flexible plate on the circumference of the cylinder of a painting machine
DE102006002330A1 (en) * 2006-01-18 2007-07-19 Koenig & Bauer Aktiengesellschaft Plate-tensioning device for print machine plate cylinder has channel for plate in cylinder with tensioning element that locks when cylinder rotates

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Publication number Priority date Publication date Assignee Title
DE1075635B (en) * 1960-02-18 R W Crabtree &. Sons Limited Leeds Yorkshire (Großbritannien) Device for tensioning the elevator on printing cylinders
US2720673A (en) * 1950-12-01 1955-10-18 Ford Motor Co Door checking and holding device
US3382799A (en) * 1966-07-29 1968-05-14 Cottrell Company Plate lockup means for offset or wraparound printing presses
US3991675A (en) * 1971-04-01 1976-11-16 Standiford Fred W Clamping saddles for thin flexible printing plates
DE2126941A1 (en) * 1971-05-29 1972-11-30 Albert Schnellpressen Device for clamping flexible printing plates on the forme cylinder of rotary printing machines
US3771449A (en) * 1971-11-24 1973-11-13 G Hill Adjustable plate saddle with grooved edges
US3941055A (en) * 1972-02-16 1976-03-02 Wilhelm Barenschee Carrier for flexible printing plates
DE2606223A1 (en) * 1976-02-17 1977-08-18 Maschf Augsburg Nuernberg Ag DEVICE FOR TENSIONING THE RUBBER CLOTH OF AN OFFSET PRINTING MACHINE
JPS5579157A (en) * 1978-12-12 1980-06-14 Tokyo Kikai Seisakusho:Kk Reversible rotating and clamping apparatus for thin- sheet-shaped printing plate in rotary printing mill

Non-Patent Citations (1)

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Title
See references of WO8505075A1 *

Also Published As

Publication number Publication date
DE3416187A1 (en) 1985-11-07
JPS62500848A (en) 1987-04-09
DE3567599D1 (en) 1989-02-23
WO1985005075A1 (en) 1985-11-21
EP0179148B1 (en) 1989-01-18
US4641576A (en) 1987-02-10

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