EP0142728B1 - Bending device for offset printing plates - Google Patents

Bending device for offset printing plates Download PDF

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Publication number
EP0142728B1
EP0142728B1 EP84112690A EP84112690A EP0142728B1 EP 0142728 B1 EP0142728 B1 EP 0142728B1 EP 84112690 A EP84112690 A EP 84112690A EP 84112690 A EP84112690 A EP 84112690A EP 0142728 B1 EP0142728 B1 EP 0142728B1
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EP
European Patent Office
Prior art keywords
plate
printing plate
bending
bending device
printing
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.)
Expired
Application number
EP84112690A
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German (de)
French (fr)
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EP0142728A3 (en
EP0142728A2 (en
Inventor
Lothar Stadler
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0142728A2 publication Critical patent/EP0142728A2/en
Publication of EP0142728A3 publication Critical patent/EP0142728A3/en
Application granted granted Critical
Publication of EP0142728B1 publication Critical patent/EP0142728B1/en
Expired legal-status Critical Current

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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
    • B41F27/1287—Devices for attaching printing elements or formes to supports for attaching flexible printing formes devices for bending the printing plates or the printing plate ends

Definitions

  • the invention relates to a bending device for offset printing plates according to the preamble of claim 1.
  • Known bending devices of this type enable the plate ends to be bent precisely to a specific pressure plate dimension.
  • positioning rails or positioning pins are used to align the printing plates before bending, so that the completely bent printing plate always assumes the same position as the register of the print image located thereon.
  • the finished printing plate is then clamped onto the plate cylinder, the tangential clamping force causing the plate to expand to a certain extent.
  • the stretching force corresponds to the applied clamping force, so that after the clamping process the plate is properly seated on the plate cylinder.
  • the plate is bent slightly shorter to achieve the same clamping force than the purely theoretical handling requires.
  • the object of the present invention is to provide a bending device for offset printing plates, which register-based clamping of the printing plate on positive clamping systems, such as these.
  • B. find use in modern register systems, allows without the printing plate is damaged or destroyed and still a uniformly good fit of the plate is guaranteed on the plate cylinder.
  • the object is achieved by the inventive features of the characterizing part of claim 1.
  • the advantage of the solution created can be seen in the fact that, with simple means and without time-consuming adjustment work, it is possible to adjust the length of the plate bent in each case to that of the plate's own elongation.
  • the printer only has to preselect the respective amount of deflection when using a particular plate in order to then find the optimum length for this type of plate, i. H. to get the optimal tension.
  • the differences in length of the individual printing plate types that are taken into account are very small and are often only a fraction of a millimeter.
  • the bending device shown in FIGS. 1 and 2 consists of a support plate 1 and a lowerable hold-down device 2, between which the pressure plate 3 is clamped.
  • Known positioning means which are not shown in the drawing, are provided for laying the printing plate in register.
  • bending beams 4 are articulated to the support plate 1, which, as shown in broken lines, can assume an upper starting position. After inserting the pressure plate, the bending beams 4 are moved downward and thus bend the pressure plate ends 5, 6 downward in accordance with the angular shape of the support plate 1.
  • the dimension between the bent printing plate ends corresponds to the dimensions given by the platen 1.
  • the two printing plate ends 5 and 6 thus run exactly parallel to one another and are angled a little closer, as would be the purely theoretical clamping length on the printing plate cylinder. Due to the force required for the expansion of the plate, a tangential clamping force is exerted on the plate, which ensures that the plate is clamped tightly and sits well on the plate cylinder.
  • An adjusting means in the form of an eccentric shaft 7 is provided approximately in the middle of the support plate 1 and runs parallel to the support plate 1.
  • the eccentric outer surface 8 thereof can be raised more or less relative to the plate plane of the support plate 1, so that when a new pressure plate 3 is placed on it, it is deflected from the straight line by the holding-down device 2 when it is clamped.
  • a recess 9 is provided in the hold-down device 2. This deflection of the pressure plate 3 from the straight line causes an extension of the Distance between the two bending edges on the support plate 1. This slight deflection makes it possible to reduce the expansion of the clamped pressure plate on the plate cylinder.
  • FIG. 3 shows the tangential clamping force F on the ordinate and the elongation path A s on the abscissa.
  • the straight line e1 shows z. B. the increase in elongation with increasing clamping force a bimetal plate and e2 the elongation behavior of an aluminum plate.
  • Line 10 represents the ideal clamping force, it being clear that the expansion path at 0 s is of different lengths for the two types of printing plates listed.
  • Figure 4 shows the eccentric shaft 7 with its eccentrically offset pin 11, which is mounted in a bearing block 12, which in turn is attached to a base plate 13 together with the support plate 1.
  • a handwheel 15 is attached, via which the eccentric shaft 7 can be rotated sensitively.
  • a disc 16 with a scale 17 is attached to the extension, which indicates the respective position in conjunction with an arrow 18.
  • the position 19 could, for. B. for the aluminum plate and position 20 for the bimetallic plate.
  • a spring-loaded ball catch 21 is provided.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Description

Die Erfindung bezieht sich auf eine Biegevorrichtung für Offsetdruckplatten gemäß dem Oberbegriff des Anspruches 1.The invention relates to a bending device for offset printing plates according to the preamble of claim 1.

Bekannte Biegevorrichtungen dieser Art (DE-AS 26 28 249) ermöglichen eine genaue Abbiegung der Plattenenden auf ein bestimmtes Druckplattenmaß. Zum Ausrichten der Druckplatten vor dem Abbiegen werden bei der bekannten Ausführung Positionierungsschienen bzw. Positionierungsstifte benutzt, so daß die fertig abgebogene Druckplatte immer die gleiche Position zum Register des darauf befindlichen Druckbildes einnimmt. Danach wird die fertige Druckplatte auf den Plattenzylinder aufgespannt, wobei die tangentiale Spannkraft eine gewisse Dehnung der Platte bewirkt. Bei formschlüssigen Spannsystemen entspricht die Dehnkraft der aufgebrachten Spannkraft, so daß nach dem Spannvorgang ein guter Sitz der Platte auf dem Plattenzylinder erzielt ist. Bei modernen Systemen wird zum Erreichen einer immer gleichen Spannkraft die Platte etwas-kürzer abgekantet, als die rein theoretische Abwicklung dies verlangt.Known bending devices of this type (DE-AS 26 28 249) enable the plate ends to be bent precisely to a specific pressure plate dimension. In the known embodiment, positioning rails or positioning pins are used to align the printing plates before bending, so that the completely bent printing plate always assumes the same position as the register of the print image located thereon. The finished printing plate is then clamped onto the plate cylinder, the tangential clamping force causing the plate to expand to a certain extent. In the case of positive clamping systems, the stretching force corresponds to the applied clamping force, so that after the clamping process the plate is properly seated on the plate cylinder. In modern systems, the plate is bent slightly shorter to achieve the same clamping force than the purely theoretical handling requires.

Nachdem bei modernen Druckmaschinen unterschiedliche Plattentypen Verwendung finden, z. B. Aluplatten, Bimetallplatten oder dergleichen, hat sich gezeigt, daß bei Verwendung eines bekannten Systems zum Abbiegen der Offsetplatten beim Spannen derselben eine Seite der abgekanteten Druckplatte abgerissen wird. Dies ist dann der Fall, wenn z. B. die Biegevorrichtung für eine Platte ausgelegt ist, die eine hohe Elastizität aufweist und eine Druckplatte mit niederer Elastizität abgebogen und verwendet wurde. Wird umgekehrt die Biegevorrichtung für eine weniger elastische Druckplatte ausgelegt, so ist bei hochelastischen Platten der gute Sitz auf dem Plattenzylinder nicht mehr gewährleistet.After different plate types are used in modern printing presses, e.g. As aluminum plates, bimetallic plates or the like, it has been found that when using a known system for bending the offset plates when tensioning the same, one side of the folded printing plate is torn off. This is the case when e.g. B. the bending device is designed for a plate that has a high elasticity and a pressure plate with low elasticity has been bent and used. Conversely, if the bending device is designed for a less elastic pressure plate, a good fit on the plate cylinder is no longer guaranteed with highly elastic plates.

Die Aufgabe der vorliegenden Erfindung ist es, eine Biegevorrichtung für Offsetdruckplatten zu schaffen, die ein registerhaltiges Aufspannen der Druckplatte auf formschlussigen Spannsystemen, wie diese z. B. bei modernen Registersystemen Verwendung finden, ermöglicht, ohne daß die Druckplatte beschädigt oder zerstört wird und trotzdem immer ein gleichmäßig guter Sitz der Platte auf dem Plattenzylinder gewährleistet ist.The object of the present invention is to provide a bending device for offset printing plates, which register-based clamping of the printing plate on positive clamping systems, such as these. B. find use in modern register systems, allows without the printing plate is damaged or destroyed and still a uniformly good fit of the plate is guaranteed on the plate cylinder.

Die Aufgabe wird durch die erfinderischen Merkmale des Kennzeichens des Anspruchs 1 gelöst. Der Vorteil der geschaffenen Lösung ist darin zu sehen, daß mit einfachen Mitteln und ohne zeitraubende Justierarbeiten eine Einstellung der jeweils abgebogenen Plattenlänge auf die der Platte eigene Dehnung möglich ist. Der Drucker muß lediglich bei Verwendung einer bestimmten Platte das jeweilige Maß der Auslenkung vorwählen, um sodann für diesen Plattentyp die optimale Länge, d. h. die optimale Spannung zu erhalten. Die Längenunterschiede der einzelnen Druckplattenarten die berücksichtigt werden, sind hierbei sehr gering und betragen oft nur Bruchteile eines Millimeters.The object is achieved by the inventive features of the characterizing part of claim 1. The advantage of the solution created can be seen in the fact that, with simple means and without time-consuming adjustment work, it is possible to adjust the length of the plate bent in each case to that of the plate's own elongation. The printer only has to preselect the respective amount of deflection when using a particular plate in order to then find the optimum length for this type of plate, i. H. to get the optimal tension. The differences in length of the individual printing plate types that are taken into account are very small and are often only a fraction of a millimeter.

Die Unteransprüche kennzeichnen vorteilhafte Ausgestaltungen des Erfindungsgegenstandes, wobei die Exzenterwelle gemäß Anspruch 2 bei sehr hoher Parallelität eine feinfühlige Veränderung der Abkantlänge ermöglicht und vom Drucker mit einem Handgriff auf den speziellen Plattentyp einzustellen ist.The subclaims characterize advantageous embodiments of the subject matter of the invention, the eccentric shaft according to claim 2, with very high parallelism, enabling a sensitive change in the folding length and to be set by the printer with a handle to the special plate type.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen schematisch dargestellt. Es zeigt :

  • Figur 1 eine Seitenansicht einer Biegevorrichtung mit ausgelenkter (verlängerter) Druckplatte, (große Abkantlänge)
  • Figur 2 eine Seitenansicht einer Biegevorrichtung mit minimal abgebogener Druckplatte, (kleine Abkantlänge)
  • Figur 3 ein Dehnungsdiagramm für verschiedene Druckplatten,
  • Figur 4 einen Teillängsschnitt durch die Exzenterwelle,
  • Figur 5 eine Seitenansicht der Exzenterwelle mit Skala.
An embodiment of the invention is shown schematically in the drawings. It shows :
  • FIG. 1 shows a side view of a bending device with a deflected (extended) pressure plate, (large folding length)
  • FIG. 2 shows a side view of a bending device with a minimally bent pressure plate (small bending length)
  • FIG. 3 shows an expansion diagram for various printing plates,
  • FIG. 4 shows a partial longitudinal section through the eccentric shaft,
  • Figure 5 is a side view of the eccentric shaft with a scale.

Die in Figur 1 und 2 dargesteIle Biegevorrichtung besteht aus einer Auflageplatte 1 und aus einem absenkbaren Niederhalter 2, zwischen denen die Druckplatte 3 eingespannt wird. Zum registerhaltigen Auflegen der Druckplatte sind ansich bekannte Positioniermittel vorgesehen, die in der Zeichnung nicht dargestellt sind. An den beiden gegenüberliegenden Kopfseiten der Druckplatte sind Biegebalken 4 gelenkig an der Auflageplatte 1 befestigt, die, wie strichpunktiert dargestellt, eine obere Ausgangsstellung einnehmen können. Nach dem Einlegen der Druckplatte werden die Biegebalken 4 nach unten bewegt und biegen somit die Druckplattenenden 5, 6 entsprechend der Winkelform der Auflageplatte 1 nach unten ab. Bei der in Figur 2 gezeigten Ausführung entspricht das Maß zwischen den abgebogenen Druckplattenenden den durch die Auflageplatte 1 vorgegebenen Maßverhältnissen. Die beiden Druckplattenenden 5 und 6 verlaufen somit genau parallel zueinander und sind um ein geringes Maß enger abgewinkelt, wie dies die rein theoretische Einspannlänge am Druckplattenzylinder erfordern wurde. Durch die für die Dehnung der Platte erforderliche Kraft wird eine tangentiale Spannkraft auf die Platte-ausgeübt, die ein sattes Aufspannen derselben und einen guten Sitz auf dem Plattenzylinder gewährleistet.The bending device shown in FIGS. 1 and 2 consists of a support plate 1 and a lowerable hold-down device 2, between which the pressure plate 3 is clamped. Known positioning means, which are not shown in the drawing, are provided for laying the printing plate in register. On the two opposite head sides of the pressure plate, bending beams 4 are articulated to the support plate 1, which, as shown in broken lines, can assume an upper starting position. After inserting the pressure plate, the bending beams 4 are moved downward and thus bend the pressure plate ends 5, 6 downward in accordance with the angular shape of the support plate 1. In the embodiment shown in FIG. 2, the dimension between the bent printing plate ends corresponds to the dimensions given by the platen 1. The two printing plate ends 5 and 6 thus run exactly parallel to one another and are angled a little closer, as would be the purely theoretical clamping length on the printing plate cylinder. Due to the force required for the expansion of the plate, a tangential clamping force is exerted on the plate, which ensures that the plate is clamped tightly and sits well on the plate cylinder.

Etwa in der Mitte der Auflageplatte 1 ist ein Stellmittel in Form einer Exzenterwelle 7 vorgesehen, das parallel zur Auflageplatte 1 verläuft. Durch Drehen der Exzenterwelle 7 läßt sich deren exzentrische Mantelfläche 8 mehr oder weniger gegenüber der Plattenebene der Auflageplatte 1 anheben, so daß beim Auflegen einer neuen Druckplatte 3 diese beim Festspannen durch den Niederhalter 2 aus der Geraden ausgelenkt wird. Hierfür ist im Niederhalter 2 eine Ausnehmung 9 vorgesehen. Diese Auslenkung der Druckplatte 3 aus der Geraden bewirkt eine Verlängerung der Strecke zwischen den beiden Abbiegekanten an der Auflageplatte 1. Dieses ansich geringe Auslenken ermöglicht es, die Dehnung der aufgespannten Druckplatte auf dem Plattenzylinder zu verringern.An adjusting means in the form of an eccentric shaft 7 is provided approximately in the middle of the support plate 1 and runs parallel to the support plate 1. By rotating the eccentric shaft 7, the eccentric outer surface 8 thereof can be raised more or less relative to the plate plane of the support plate 1, so that when a new pressure plate 3 is placed on it, it is deflected from the straight line by the holding-down device 2 when it is clamped. For this purpose, a recess 9 is provided in the hold-down device 2. This deflection of the pressure plate 3 from the straight line causes an extension of the Distance between the two bending edges on the support plate 1. This slight deflection makes it possible to reduce the expansion of the clamped pressure plate on the plate cylinder.

In Figur 3 ist auf der Ordinate die tangentiale Spannkraft F und auf der Abszisse der Dehnungsweg A s dargestellt. Die Gerade e1 zeigt z. B. den Anstieg der Dehnung bei steigender Spannkraft eine Bimetallplatte und e2 das Dehnungsverhalten einer Alu-Platte. Die Linie 10 stellt die ideale Spannkraft dar, wobei klar ersichtlich ist, daß der Dehnungsweg bei 0 s bei den beiden aufgeführten Druckplattentypen unterschiedlich lang ist.FIG. 3 shows the tangential clamping force F on the ordinate and the elongation path A s on the abscissa. The straight line e1 shows z. B. the increase in elongation with increasing clamping force a bimetal plate and e2 the elongation behavior of an aluminum plate. Line 10 represents the ideal clamping force, it being clear that the expansion path at 0 s is of different lengths for the two types of printing plates listed.

Figur 4 zeigt die Exzenterwelle 7 mit ihrem exzentrisch versetzten Zapfen 11, der in einem Lagerbock 12 gelagert ist, der wiederum auf einer Grundplatte 13 befestigt ist gemeinsam mit der Auflageplatte 1. Auf der Verlängerung 14 des Zapfens 11 ist ein Handrad 15 befestigt, über das die Exzenterwelle 7 feinfühlig verdreht werden kann. Außerdem ist auf der Verlängerung eine Scheibe 16 mit einer Skala 17 befestigt, die in Verbindung mit einem Pfeil 18 die jeweilige Stellposition anzeigt. Die Stellung 19 könnte z. B. für die Alu-Platte und die Stellung 20 für die Bimetallplatte vorgesehen sein. Um ein unbeabsichtigtes Verstellen zu verhindern, ist eine federnd abgestützte Kugelraste 21 vorgesehen.Figure 4 shows the eccentric shaft 7 with its eccentrically offset pin 11, which is mounted in a bearing block 12, which in turn is attached to a base plate 13 together with the support plate 1. On the extension 14 of the pin 11, a handwheel 15 is attached, via which the eccentric shaft 7 can be rotated sensitively. In addition, a disc 16 with a scale 17 is attached to the extension, which indicates the respective position in conjunction with an arrow 18. The position 19 could, for. B. for the aluminum plate and position 20 for the bimetallic plate. To prevent unintentional adjustment, a spring-loaded ball catch 21 is provided.

Claims (3)

1. Bending device for offset printing plates including a support plate (1), a respective bending bar (4) being pivotally mounted on the two opposite head portions of said support plate, a lowerable down-holder means (2) for holding down a printing plate (3) and positioning means for bending the two printing plate ends (5, 6) in-register to given printing plate dimensions, characterized in that an adjusting means is disposed parallel to said bending bars (4) for the purpose of adjusting between the two bent printing plate ends (5, 6) different kinds of printing plates to the respective strain behaviour, said adjusting means being movable into the surface of said printing plate, thus causing said printing plate to be deflected from a plane in which it is disposed.
2. Bending device according to Claim 1, characterized in that said adjusting means is an eccentric shaft (7) the eccentrically rotatable outer cylindrical surface (8) of which is engageable with said printing plate (3) so that, by turning said eccentric shaft (7), said printing plate (3) is deflected according to the degree of turning from a plane in which it is disposed.
3. Bending device according to Claims 1 and 2, characterized in that said eccentric shaft (7) can be turned by means of a handwheel (15) and is adjustable in accordance with a scale means (17).
EP84112690A 1983-11-19 1984-10-20 Bending device for offset printing plates Expired EP0142728B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341924 1983-11-19
DE3341924A DE3341924C2 (en) 1983-11-19 1983-11-19 Bending device for offset printing plates

Publications (3)

Publication Number Publication Date
EP0142728A2 EP0142728A2 (en) 1985-05-29
EP0142728A3 EP0142728A3 (en) 1986-02-19
EP0142728B1 true EP0142728B1 (en) 1989-01-11

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Application Number Title Priority Date Filing Date
EP84112690A Expired EP0142728B1 (en) 1983-11-19 1984-10-20 Bending device for offset printing plates

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US (1) US4598568A (en)
EP (1) EP0142728B1 (en)
JP (1) JPS60120058A (en)
DE (1) DE3341924C2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539586A1 (en) * 1985-11-08 1987-05-14 Roland Man Druckmasch METHOD FOR APPLYING A PROTECTIVE COATING TO A PRINTING CYLINDER WITH DEVICES FOR CARRYING OUT THE METHOD
DE3739173A1 (en) * 1987-11-19 1989-06-01 Feintool Int Holding METHOD AND DEVICE FOR BENDING WORKPIECES
DE3943566A1 (en) * 1989-11-20 1991-05-23 Koenig & Bauer Ag Flexible printing plate for form cylinder - is of convex shape arched outwards near ends
DE3938477A1 (en) * 1989-11-20 1991-05-23 Koenig & Bauer Ag PRINT PLATE BENDING DEVICE
DE4306237A1 (en) * 1993-02-27 1994-09-01 Heidelberger Druckmasch Ag Device for setting the inclined register in a clamping device for clamping printing plates in an offset printing machine
DE19516368C2 (en) * 1995-05-04 1999-09-23 Neumeister Geb Gmbh Method and device for adapting the position of printing plates to the deformation of the paper to be printed
US5699740A (en) * 1996-06-17 1997-12-23 Creo Products Inc. Method of loading metal printing plates on a vacuum drum
US5987949A (en) * 1997-03-18 1999-11-23 Heidelburg Harris, Inc. Plate scanner--bending device
DE10338374A1 (en) * 2003-08-21 2005-03-17 Koenig & Bauer Ag Printing plate guide device for printing plate changer has clamping gap shaped to produce required geometry of rear edge

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US412254A (en) * 1889-10-08 Mills
US864325A (en) * 1906-05-04 1907-08-27 Mcdonald Machine Company Can-forming machine.
US1710985A (en) * 1927-01-31 1929-04-30 Monighan Mfg Corp Excavating-bucket-forming machine
US2190423A (en) * 1937-12-06 1940-02-13 Motor Products Corp Windshield frame bending machine
GB983523A (en) * 1962-10-11 1965-02-17 Rubery Owen & Company Ltd Improvements relating to load-supporting plates or panels
DE2036490A1 (en) * 1970-07-23 1972-01-27 Maschf Augsburg Nuernberg Ag Method and device for properly fitting flexible printing plates on the forme cylinder of multi-color sheet-fed offset rotary printing machines
US3677059A (en) * 1971-02-19 1972-07-18 Burroughs Corp Lithoplate bender
US3733872A (en) * 1971-07-15 1973-05-22 C Gregoire Roller bender for offset printing plates
DE2628249C3 (en) * 1976-06-24 1984-08-02 Heinz 5653 Leichlingen Metje Bending device for offset printing plates
JPS5338263A (en) * 1976-09-21 1978-04-08 Toshiba Corp Plasma treating apparatus of semiconductors
DE3221489C2 (en) * 1982-06-07 1985-03-28 Heinz 5653 Leichlingen Metje Bending device for offset printing plates

Also Published As

Publication number Publication date
US4598568A (en) 1986-07-08
JPS60120058A (en) 1985-06-27
EP0142728A3 (en) 1986-02-19
DE3341924A1 (en) 1985-05-30
DE3341924C2 (en) 1987-03-26
JPH0418548B2 (en) 1992-03-27
EP0142728A2 (en) 1985-05-29

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