EP0306986A2 - Printing plate for rotary printing - Google Patents

Printing plate for rotary printing Download PDF

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Publication number
EP0306986A2
EP0306986A2 EP88114808A EP88114808A EP0306986A2 EP 0306986 A2 EP0306986 A2 EP 0306986A2 EP 88114808 A EP88114808 A EP 88114808A EP 88114808 A EP88114808 A EP 88114808A EP 0306986 A2 EP0306986 A2 EP 0306986A2
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EP
European Patent Office
Prior art keywords
plate
printing
cylinder
connection
pressure plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88114808A
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German (de)
French (fr)
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EP0306986B1 (en
EP0306986A3 (en
Inventor
Daniele Temporin
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.)
Officine Meccaniche Giovanni Cerutti SpA
Original Assignee
Officine Meccaniche Giovanni Cerutti SpA
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.)
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Publication date
Application filed by Officine Meccaniche Giovanni Cerutti SpA filed Critical Officine Meccaniche Giovanni Cerutti SpA
Priority to AT88114808T priority Critical patent/ATE91972T1/en
Publication of EP0306986A2 publication Critical patent/EP0306986A2/en
Publication of EP0306986A3 publication Critical patent/EP0306986A3/en
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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
    • B41F27/1293—Devices for filling up the cylinder gap; Devices for removing the filler
    • 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
    • B41F27/1281—Devices for attaching printing elements or formes to supports for attaching flexible printing formes details of the printing plate ends
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking

Definitions

  • the above invention relates to a method for joining the ends of a printing plate for a rotary printing press.
  • the invention also relates to the printing plate produced by the method.
  • it has already been proposed to replace the copper coating on the printing cylinder by a die forming the printing plate, the outer coating of which consists of photosensitive material. Since such matrices are usually manufactured as flat plates, there is a need to join the two ends of the pressure plate and to mount this pressure plate precisely and stationary on the pressure cylinder.
  • This known type of plate connection has several disadvantages. On the one hand, a special and, above all, highly precise machining of the two plate ends (punching process) is required in order to enable a positive connection of the ends. Furthermore, the punched-outs for the positive connection necessarily have considerable dimensions, which considerably restrict the usable area for applying the printed image to the plate. Furthermore, the printing plate described can only be used commonly with a cylinder to be specially trained. The known plates are not interchangeable and mostly the positive connection is to be made directly on the printing cylinder on which the printing plate is used.
  • connection joint between the plate ends can be inclined at a certain angle to the radius of the cylinder or can be arranged completely bent.
  • connection joint can be made as a permanent connection by filling an adhesive between the bent and joined plate ends.
  • the printing plate can also be made detachable in order to be able to return to its original, flat shape after the printing process. Further exemplary embodiments of the invention can be found in the subclaims.
  • the invention further relates to a printing plate, the ends of which are joined in accordance with the method shown.
  • the invention can be found in the following description of some exemplary embodiments, which are shown in the following drawings.
  • FIG. 1 shows a printing plate 1 of a known type for use in a rotary printing press.
  • the pressure plate 1 is only partially shown and has ends 2 and 3.
  • the plate 1 shown has already been deformed in such a way that an elastic body with a cylindrical shape is formed.
  • the plate ends 2 and 3 are not yet connected to one another in FIG. 1.
  • the length or development of the plate 1 is larger than the circumference of the printing cylinder used, since two opposite edge strips 2 and 3 must be available for the production of the plate joint.
  • Fig. 2 shows a partial section of the edge 3, which shows the structure of the printing plate.
  • the plate consists of a metallic Carrier layer 4, for example made of sheet steel, on which a photosensitive coating 5 made of polymer material is applied. This coating is then processed photochemically in a known manner in order to create the printed image on the printing plate.
  • FIG. 2 shows the right end piece of the plate, which has already been stripped of the photosensitive coating along the strip 14.
  • the strip 14 is later used to make the butt joint between the two plate ends.
  • the photosensitive layer 5 can be removed by photochemical means or by machining, as shown in FIG. 2.
  • FIG. 3 another exemplary embodiment of a printing plate is shown in section.
  • the plate consists of a metallic carrier material 4, a photosensitive layer 5 and a thin intermediate layer 6, which has the task of ensuring better anchoring of the photosensitive layer on the carrier material 4.
  • a strip 15 was stripped of the photosensitive coating. This can also be done, for example, by photochemical means, leaving the intermediate strip 6.
  • the preparation of the strip 15 can also be done by mechanical material removal. In this case, the intermediate layer 6 would also be removed in an advantageous manner.
  • the end strip 2 is provided with a bevel 12 in order to produce a butt connection, this by bending the strip 2 by approximately 90 ° and through Execution of two further turns in immediate succession (U-shaped) The angled end 11 is introduced into this crank, which was also bent through 90 ° in 18 of the strip 3.
  • the butt joint which is shown schematically in FIG. 4, is aligned in the radial direction and represents a butt joint with a large space requirement inside the pressure plate.
  • a corresponding groove with a suitable depth must therefore be provided in the pressure cylinder. If the depth of this groove is to be reduced, it is advantageous to use the embodiment according to FIG. 5, for the description of which the same reference numerals have been used.
  • the bending angle 8 of the crank 12 is less than 90 ° (with reference to the flat starting surface).
  • the bending angle 8 of the piece 11 is also less than 90 ° and essentially the same as the angle 8 of the crank 12. In this way, the connection is inclined with respect to the radial direction of the pressure cylinder and the corresponding groove for the insertion of the connection point is in depth ( radial) smaller.
  • Fig. 6 shows a further embodiment, in which the connection point completely towards the inner surface of the printing plate is folded.
  • the bend 17 of the angle is approximately 90 °.
  • a further bend 19 by 90 ° is provided, and the bend 18 takes place over an angle of 180. In this way, the butt joint 20 is made flat and requires little space on the inside of the pressure plate.
  • the butt joints which are shown schematically in FIGS. 4-6, are closed by at least one seam made of hardening filler material or adhesive along the groove between two adjacent folds 17, 18 of the edges 2, 3. This creates a butt joint for the pressure plate, which ensures continuity on the outer circumference of the pressure plate. Irregularities when using the pressure plate, unwanted wear of the pressure plate and other troublesome side effects are avoided.
  • a filler seam 8 i.e. a connection in the circumferential direction by means of self-hardening material or by means of an adhesive for producing a smooth and continuous peripheral surface of the plate, can be used for all the butt joints described.
  • the pressure plate is not permanently deformed as a cylinder.
  • the connecting seam made of adhesive or filler 8 can be destroyed or generally removed.
  • an adhesive or a hardening filling material 9 can also be provided inside the crank.
  • a connection is thus obtained in the axial direction, not a detachable mechanical connection, but rather leads to the establishment of a permanent connection between the cranked plate ends.
  • This type of connection which can also be used in other embodiments, leads to the formation of a permanently cylindrical pressure plate.
  • the proposed objects are achieved by the invention.
  • the butt joint allows the entire usable area of the printing cylinder to be used for recording the print image in practice.
  • the plate and the associated butt joint are simple and cheap, the connection can be detached if desired so that the plate again takes the form of a flat plate.
  • a limited space requirement for the butt joint in the interior of the plate can be achieved, space that can be created in a simple manner by providing a groove or a recess in the surface of the pressure cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Replacement Of Web Rolls (AREA)
  • Laminated Bodies (AREA)

Abstract

Die gegenueberliegenden Enden (2, 3) einer Druckplatte (1) fuer den Rotationsdruck werden gegenseitig zusammengefuegt, um eine zylinderfoermige Druckplatte (1) herzustellen, die auf einem Druckzylinder aufziehbar ist, z.B. auf einem im Durchmesser dehnbaren Druckzylinder. Die Verbindung wird dadurch hergestellt, dass die fotoempfindliche Beschichtung (5) der Druckplatte (1) an zwei endseitigen Raendern abgetragen wird, dass an einem Plattenende (2) eine abgebogene Kroepfung (12) gebildet wird und, dass das andere ca. um 90° gebogene Ende (11) in die Kroepfung eingesetzt wird. Die Verbindung kann laengs einer Mantellinie des Zylinders oder laengs einer gegenueber den Mantellinien des Zylinders geneigten Linie erfolgen.The opposite ends (2, 3) of a printing plate (1) for rotary printing are mutually joined to produce a cylindrical printing plate (1) which can be pulled up on a printing cylinder, e.g. on a pressure cylinder that can be stretched in diameter. The connection is established in that the photosensitive coating (5) of the pressure plate (1) is removed on two edges at the ends, in that a bent crank (12) is formed on one end of the plate (2) and in that the other is turned by approximately 90 ° curved end (11) is inserted into the crank. The connection can take place along a surface line of the cylinder or along a line inclined with respect to the surface lines of the cylinder.

Die Platte (1) kann mit den abgebogenen und radial nach innen abstehenden Raendern (2, 3) montiert werden, oder aber, diese Raender (2, 3) koennen gegenueber dem Zylinderradius geneigt angeordnet sein. Der Zwischenraum, der sich zwischen den zwei nebeneinanderliegenden Abkroepfungen (11, 12) der Endraender (2, 3) der Druckplatte (1) bildet, wird mit aushaertendem Material (9) gefuellt. Somit wird eine Verbindung geschaffen, die in Umfangsrichtung eine kontinuiertliche, glatte Flaeche fuer die Druckplatte (1) bildet. Das Fuellmaterial (9) kann nach erfolgtem Einsatz der Druckplatte entfernt werden, und damit ein Lagern der Druckplatte (1) als flache Platte ermoeglichen. Alternativ kann die Verbindung der Plattenenden (2, 3) auch dauerhaft erfolgen, indem ein Klebstoff (8) zwischen die abgekroepften Teile, eingebracht wird, um somit eine dauerhafte Verbindung auch in Axialrichtung zu schaffen.

Figure imgaf001
The plate (1) can be mounted with the bent and radially inwardly projecting wheels (2, 3), or else, these wheels (2, 3) can be arranged inclined to the cylinder radius. The The space that is formed between the two adjacent bends (11, 12) of the end edges (2, 3) of the pressure plate (1) is filled with hardening material (9). This creates a connection that forms a continuous, smooth surface for the pressure plate (1) in the circumferential direction. The filling material (9) can be removed after the printing plate has been used, thus enabling the printing plate (1) to be stored as a flat plate. Alternatively, the plate ends (2, 3) can also be permanently connected by inserting an adhesive (8) between the cranked parts in order to create a permanent connection in the axial direction.
Figure imgaf001

Description

Die vorstehende Erfindung betrifft ein Verfahren zum Zuammenfuegen der Enden einer Druckplatte fuer eine Rotationsdruckmaschine. Die Erfindung betrifft auch die mit dem Verfahren hergestellte Druckplatte. Um die Produktivitaet von Rotationsdruckmaschinen zu erhoehen, wurde bereits vorgeschlagen, die Kupferbeschichtung auf dem Druckzylinder durch eine, die Druckplatte bildende Matritze zu ersetzen, deren Aussenbeschichtung aus fotoempfindlichem Material besteht. Da derartige Matritzen ueblicherweise als flache Platten hergestellt werden, besteht die Notwendigkeit, die beiden Enden der Druckplatte zusammenzufuegen, und diese Druckplatte genau und ortsfest auf dem Druckzylinder zu montieren.The above invention relates to a method for joining the ends of a printing plate for a rotary printing press. The invention also relates to the printing plate produced by the method. In order to increase the productivity of rotary printing presses, it has already been proposed to replace the copper coating on the printing cylinder by a die forming the printing plate, the outer coating of which consists of photosensitive material. Since such matrices are usually manufactured as flat plates, there is a need to join the two ends of the pressure plate and to mount this pressure plate precisely and stationary on the pressure cylinder.

Es wurde bereits vorgeschlagen, die beiden Enden der Druckplatte durch einen Stanzvorgang zu bearbeiten, um somit eine formschluessige gegenseitige Verbindung der Plattenenden zu ermoeglichen. Diese Aussstanzungen, die eine formschluessige Verbindung der Plattenenden ermoeglichen, verhindert eine Trennung der Plattenenden in Tangentialrichtung des Zylinders. Bei der bekannten Ausfuehrung ist ein Kleber oder ein aushaertendes Material auf der Plattenoeberflaeche vorgesehen, um zu vermeiden, dass sich die zusammengefuegten Enden der Platte oeffnen. Ferner ist dieses Fuellmaterial vorgesehen, damit an der Stosstelle eine fuer Druckplatten notwendige Kontinuitaet und Glaette der Oberflaeche gewaehrleiste wird. Eine derartige Druckplatte findet Verwendung mit einem in Radialrichtung dehnbaren Zylinder, der magnetische Haltevorrichtungen aufweist, welche die Enden der Druckplatte auf dem Umfang des Druckzylinders festlegt. Diese bekannte Art der Plattenverbindung hat verschiedene Nachteile. Einmal bedarf es einer besonderen und vor allem hochgenauen Bearbeitung der beiden Plattenenden (Stanzvorgang), um eine formschluessige Verbindung der Enden zu ermoeglichen. Desweiteren weisen die Ausstanzungen fuer die formschluessige Verbindung zwangsweise erhebliche Abmessungen auf, welche die nutzbare Flaeche zur Aufbringung des Druckbildes auf der Platte wesentlich einschraenkt. Desweiteren kann die beschriebene Druckplatte nur gemeinman mit einem besonders auszubildenden Zylinder verwendet werden. Die bekannten Platten sind nicht untereinander austauschbar und meistens ist die formschluessige Verbindung direkt auf dem Druckzylinder herzustellen, auf dem die Druckplatte zum Einsatz kommt.It has already been proposed to machine the two ends of the printing plate by means of a stamping process, in order to enable a form-fitting mutual connection of the plate ends. This punched-out, which enables a form-fitting connection of the plate ends, prevents separation of the plate ends in Tangential direction of the cylinder. In the known embodiment, an adhesive or a hardening material is provided on the surface of the plate in order to prevent the joined ends of the plate from opening. Furthermore, this filling material is provided so that continuity and smoothness of the surface, which is necessary for printing plates, is guaranteed at the joint. Such a printing plate is used with a radially expandable cylinder which has magnetic holding devices which fix the ends of the printing plate on the circumference of the printing cylinder. This known type of plate connection has several disadvantages. On the one hand, a special and, above all, highly precise machining of the two plate ends (punching process) is required in order to enable a positive connection of the ends. Furthermore, the punched-outs for the positive connection necessarily have considerable dimensions, which considerably restrict the usable area for applying the printed image to the plate. Furthermore, the printing plate described can only be used commonly with a cylinder to be specially trained. The known plates are not interchangeable and mostly the positive connection is to be made directly on the printing cylinder on which the printing plate is used.

Aufgabe der vorstehenden Erfindung ist es, die Nachteile des Standes der Technik zu vermeiden und ein neues Verfahren zum Verbinden von Druckplatten der genannten Art, sowie eine somit hergestellte Druckplatte fuer Rotationsdruckmaschinen vorzuschlagen. Diese Aufgabe wird mit dem erfindungsgemaessen Verfahren zum Verbinden der Enden einer Druckplatte fuer den Rotationsdruck, bestehend aus einem metallischen Traeger und einer fotoempfindlichen Beschichtung durch folgende Verfahrensschritte geloest:

  • a) Abtragen der fotoempfindlichen Beschichtung an zwei gegenueberliegenden Endstreifen der Platte
  • b) Bildung einer Abkroepfung an einem Plattenende und Abwinkeln des verbleibenden Plattenendes und Einfuegung der Abwinkelung in die vorher erstellte Abkroepfung, sowie
  • c) Aufbringen eines aushaertenden Materials laengs der zwischen den nebeneinanderliegenden Plattenenden gebildeten Nut, zur Schaffung einer kontinuierlichen Oberflaeche der Druckplatte laengs des Verbindungs­stosses.
The object of the above invention is to avoid the disadvantages of the prior art and a new method for connecting printing plates of the type mentioned, and one thus produced Propose printing plate for rotary printing machines. This object is achieved with the method according to the invention for connecting the ends of a printing plate for rotary printing, consisting of a metallic support and a photosensitive coating, by the following method steps:
  • a) Removal of the photosensitive coating on two opposite end strips of the plate
  • b) formation of a bend at one end of the plate and angling of the remaining end of the plate and insertion of the bend in the previously created bend, and
  • c) applying a hardening material along the groove formed between the adjacent plate ends to create a continuous surface of the pressure plate along the connecting joint.

Entsprechend einer weiteren vorteilhaften Ausfuehrungsform kann der Verbindungsstoss zwischen den Plattenenden in einem bestimmten Winkel zum Radius des Zylinders geneigt oder vollkommen umgebogen angeordnet sein.According to a further advantageous embodiment, the connection joint between the plate ends can be inclined at a certain angle to the radius of the cylinder or can be arranged completely bent.

Desweiteren kann der Verbindungsstoss als dauerhafte Verbindung dadurch hergestellt werden, dass ein Kleber zwischen die abgebogenen und zusammengefuegten Plattenenden eingefuellt wird. Die Druckplatte kann auch loesbar hergestellt werden, um ihre urspruengliche, flache Form nach dem Druckvorgang wieder einnehmen zu koennen. Weitere Ausfuehrungsbeispiele der Erfindung koennen den Unteranspruechen entnommen werden.Furthermore, the connection joint can be made as a permanent connection by filling an adhesive between the bent and joined plate ends. The printing plate can also be made detachable in order to be able to return to its original, flat shape after the printing process. Further exemplary embodiments of the invention can be found in the subclaims.

Die Erfindung betriff ferner eine Druckplatte, deren Enden entsprechend dem aufgezeigten Verfahren zusammengefuegt werden. Die Erfindung kann der nun folgenden Beschreibung einiger Ausfuehrungsbeispiele entnommen werden, die in den folgenden Zeichnungen dargestellt sind.The invention further relates to a printing plate, the ends of which are joined in accordance with the method shown. The invention can be found in the following description of some exemplary embodiments, which are shown in the following drawings.

Es zeigen:

  • Fig. 1 in perspektiver Ansicht ein Teilstueck der Druckplatte vor dem Zusammenfuegen;
  • Fig. 2 und 3 zwei mogliche Ausfuehrungsformen von Druckplatten im Schnitt;
  • Fig. 4-6 drei moegliche Ausfuehrungsformen des Plattenstosses; und
  • Fig. 7 und 8 weitere moegliche Ausfuehrungsformen des Stosses entsprechend Fig. 5.
Show it:
  • Figure 1 is a perspective view of a portion of the pressure plate before assembly.
  • Figures 2 and 3 two possible embodiments of printing plates in section.
  • Fig. 4-6 three possible embodiments of the plate joint; and
  • 7 and 8 further possible embodiments of the joint corresponding to FIG. 5.

In Fig. 1 ist eine Druckplatte 1 bekannter Bauart fuer den Einsatz in einer Rotationsdruckmaschine dargestellt. Die Druckplatte 1 ist nur teilweise gezeigt und weist Enden 2 und 3 auf. Die dargestellte Platte 1 wurde bereits derartig verformt, dass ein elastischer Koerper mit zylindrischer Form gebildet wird. Die Plattendende 2 und 3 sind in Fig. 1 noch nicht miteinander verbunden.1 shows a printing plate 1 of a known type for use in a rotary printing press. The pressure plate 1 is only partially shown and has ends 2 and 3. The plate 1 shown has already been deformed in such a way that an elastic body with a cylindrical shape is formed. The plate ends 2 and 3 are not yet connected to one another in FIG. 1.

Gemaess der Erfindung ist die Laenge oder Abwicklung der Platte 1 groesser als der Umfang des verwendeten Druckzylinders, da zwei gegenueberliegende Randstreifen 2 und 3 zur Herstellung des Plattenstosses zur Verfuegung stehen muessen.According to the invention, the length or development of the plate 1 is larger than the circumference of the printing cylinder used, since two opposite edge strips 2 and 3 must be available for the production of the plate joint.

Fig. 2 stellt einen Teilschnitt des Randes 3 dar, der den Aufbau der Druckplatte kenntlich macht. Die Platte besteht aus einer metallischen Traegerschicht 4, z.B. aus Stahlblech, auf dem eine fotoempfindliche Beschichtung 5 aus Polymermaterial aufgetragen ist. Diese Beschichtung wird im Anschluss in bekannter Weise fotochemisch bearbeitet um das Druckbild auf der Druckplatte zu erstellen.Fig. 2 shows a partial section of the edge 3, which shows the structure of the printing plate. The plate consists of a metallic Carrier layer 4, for example made of sheet steel, on which a photosensitive coating 5 made of polymer material is applied. This coating is then processed photochemically in a known manner in order to create the printed image on the printing plate.

Fig. 2 zeigt das rechte Endstueck der Platte, das bereits von der fotoempfindlichen Beschichtung laengs des Streifens 14 befreit wurde. Der Streifen 14 wird spaeter zur Herstellung der Stossverbindung zwischen den zwei Plattenenden verwendet. Das Abtragen der fotoempfindlichen Schicht 5 kann auf fotochemischem Wege oder aber durch spanabhebende Bearbeitung, wie in Fig. 2 dargestellt ist, erfolgen.FIG. 2 shows the right end piece of the plate, which has already been stripped of the photosensitive coating along the strip 14. The strip 14 is later used to make the butt joint between the two plate ends. The photosensitive layer 5 can be removed by photochemical means or by machining, as shown in FIG. 2.

In Fig. 3 ist ein weiteres Ausfuehrungsbeispiel einer Druckplatte im Schnitt dargestellt. Die Platte besteht aus einem metallischen Traegermaterial 4, einer fotoempfindlichen Schicht 5 und einer duennen Zwischenschicht 6, die die Aufgabe hat, eine bessere Verankerung der fotoempfindlichen Schicht auf dem Traegermaterial 4 zu gewaehrleisten. Wie in Fig. 3 dargestellt ist, wurde ein Streifen 15 von der fotoempfindlichen Beschichtung befreit. Dies kann z.B. auch auf fotochemischem Wege erfolgen, wobei der Zwischenstreifen 6 belassen wird. Die Vorbereitung des Streifens 15 kann aber auch durch mechanische Materialabnahme erfolgen. In diesem Fall wuerde in vorteilhafter Weise auch die Zwischenschicht 6 abgetragen werden. Unter Bezugnahme auf die Fig. 4 wird zur Herstellung einer Stossverbindung der Endstreifen 2 mit einer Abkroepfung 12 versehen, dies durch Abbiegen des Streifens 2 um ca. 90° und durch Ausfuehrung von zwei weiteren Abbiegungen in unmittelbarer Folge (U-­foermig) In diese Kroepfung wird das abgewinkelte Ende 11 eingefuehrt, das ebenfalls um 90° in 18 des Streifens 3 abgebogen wurde.In Fig. 3, another exemplary embodiment of a printing plate is shown in section. The plate consists of a metallic carrier material 4, a photosensitive layer 5 and a thin intermediate layer 6, which has the task of ensuring better anchoring of the photosensitive layer on the carrier material 4. As shown in Fig. 3, a strip 15 was stripped of the photosensitive coating. This can also be done, for example, by photochemical means, leaving the intermediate strip 6. The preparation of the strip 15 can also be done by mechanical material removal. In this case, the intermediate layer 6 would also be removed in an advantageous manner. With reference to FIG. 4, the end strip 2 is provided with a bevel 12 in order to produce a butt connection, this by bending the strip 2 by approximately 90 ° and through Execution of two further turns in immediate succession (U-shaped) The angled end 11 is introduced into this crank, which was also bent through 90 ° in 18 of the strip 3.

In Fig. 4 ist wieder ein Kleber noch ein anderer aushaertender Fuellstoff vorgesehen. Das Anbringen eines Klebers oder Fuellers wird im Anschluss unter Bezugnahme auf die Figuren 7 und 8 noch beschrieben werden.In Fig. 4 an adhesive yet another curing filler is again provided. The application of an adhesive or filler will be described below with reference to FIGS. 7 and 8.

Die Stossverbindung, die schematisch in Fig. 4 dargestellt ist, ist in radialer Richtung ausgerichtet und stellt eine Stossverbindung mit grossem Platzbedarf im Inneren der Druckplatte dar. Daher ist im Druckzylinder eine entsprechende Nut mit geeigneter Tiefe vorzusehen. Sofern die Tiefe dieser Nut verringert werden soll, ist es vorteilhaft, die Ausfuehrungsform gemaess Fig. 5 zu verwenden, fuer deren Beschreibung die gleichen Bezugszeichen verwendet wurden. Entsprechend dieser weiteren Ausfuehrungsform ist der Biegewinkel 8 der Kroepfung 12 kleiner als 90° (unter Bezugnahme auf die ebene Ausgangsflaeche). Der Biegewinkel 8 des Entstueckes 11 ist ebenfalls kleiner als 90° und im wesentlichen gleich dem Winkel 8 der Kroepfung 12. Auf diese Weise ist die Verbindung gegenueber der Radialrichtung des Druckzylinders geneigt angeordnet und die entsprechende Nut fuer das Einfuehren der Verbindungsstelle ist in ihrer Tiefe (radial) kleiner bemessen.The butt joint, which is shown schematically in FIG. 4, is aligned in the radial direction and represents a butt joint with a large space requirement inside the pressure plate. A corresponding groove with a suitable depth must therefore be provided in the pressure cylinder. If the depth of this groove is to be reduced, it is advantageous to use the embodiment according to FIG. 5, for the description of which the same reference numerals have been used. According to this further embodiment, the bending angle 8 of the crank 12 is less than 90 ° (with reference to the flat starting surface). The bending angle 8 of the piece 11 is also less than 90 ° and essentially the same as the angle 8 of the crank 12. In this way, the connection is inclined with respect to the radial direction of the pressure cylinder and the corresponding groove for the insertion of the connection point is in depth ( radial) smaller.

Schliesslich zeigt die Fig. 6 eine weitere Ausfuehrungsform, in der die Verbindungsstelle vollkommen zur inneren Flaeche der Druckplatte hin abgekantet ist. Mit anderen Worten, die Abbiegung 17 des Winkels betraegt ca. 90°. Es ist aber eine weitere Abkantung 19 um 90° vorgesehen, und die Abkantung 18 erfolgt ueber einen Winkel von 180. Auf diese Weise wird die Stossverbindung 20 flach ausgefuehrt und benoetigt nur wenig Platz auf der Innenseite der Druckplatte.Finally, Fig. 6 shows a further embodiment, in which the connection point completely towards the inner surface of the printing plate is folded. In other words, the bend 17 of the angle is approximately 90 °. However, a further bend 19 by 90 ° is provided, and the bend 18 takes place over an angle of 180. In this way, the butt joint 20 is made flat and requires little space on the inside of the pressure plate.

Die Stossverbindungen, die schematisch in den Figuren 4 - 6 dargestellt sind, werden durch wenigstens eine Naht aus haertendem Fuellmaterial oder Klebstoff laengs der Nut zwischen zwei benachbarten Abkantungen 17, 18 der Raender 2, 3 geschlossen. Somit wird eine Stossverbindung fuer die Druckplatte gebildet, die Kontinuitaet am Aussenumfang der Druckplatte gewaehrleistet. Damit werden Unregelmaessigkeiten beim Benutzen der Druckplatte, unerwuenschte Abnutzung der Druckplatte und andere stoerende Nebenerscheinungen vermieden.The butt joints, which are shown schematically in FIGS. 4-6, are closed by at least one seam made of hardening filler material or adhesive along the groove between two adjacent folds 17, 18 of the edges 2, 3. This creates a butt joint for the pressure plate, which ensures continuity on the outer circumference of the pressure plate. Irregularities when using the pressure plate, unwanted wear of the pressure plate and other troublesome side effects are avoided.

Auch wenn nur in Fig. 7 die Vorsehung einer Fuellnaht fuer eine Stossverbindung gemaess der Fig. 5 dargestellt ist, ist es einleuchtend, dass eine Fuellnaht 8, d.h. eine Verbindung in Umfangsrichtung mittels selbsthaertendem Material oder durch einen Kleber zur Herstellung einer glatten und kontinuierlichen Umfangsflaeche der Platte, fuer alle beschriebenen Stossverbindungen einsetzbar ist.Even if the provision of a filler seam for a butt joint according to FIG. 5 is only shown in FIG. 7, it is obvious that a filler seam 8, i.e. a connection in the circumferential direction by means of self-hardening material or by means of an adhesive for producing a smooth and continuous peripheral surface of the plate, can be used for all the butt joints described.

Mit diesen Ausfuehrungsformen, die eine Stossverbindung in Axialrichtung darstellen und die ausschliesslich eine mechanische Stossverbindung zeigen, sowie durch die Verwendung eines Fuellstoffes oder eines Klebers, ist die Druckplatte nicht permanent als Zylinder verformt. Tatsaechlich kann bei Beendigung des Druckvorganges die Verbindungsnaht aus Kleber oder Fuellstoff 8 zerstoert werden oder allgemein entfernt werden. Durch Verformung der Wandbereiche 2 und 3 ist es moeglich, die Stossverbindung zu loesen und somit die Matritze erneut in ihre urspruengliche Form einer flachen Platte umzuwandeln, die eine Lagerung der Druckplatte wesentlich vereinfacht.With these embodiments, which represent a butt joint in the axial direction and which only show a mechanical butt joint, as well as through the use of a filler material or an adhesive, the pressure plate is not permanently deformed as a cylinder. In fact, at the end of the printing process, the connecting seam made of adhesive or filler 8 can be destroyed or generally removed. By deforming the wall areas 2 and 3, it is possible to release the butt connection and thus convert the die again into its original shape of a flat plate, which considerably simplifies storage of the pressure plate.

Als Alternativvorschlag, wie in Fig. 8 dargestellt, stets unter Bezugnahme auf die schematisch dargestellte Variante in Fig. 5, kann ein Kleber oder ein aushaertendes Fuellmaterial 9 auch im Innern der Kroepfung vorgesehen sein. Man erhaelt somit eine Verbindung in Axialrichtung, keine loesbare mechanische Verbindung darstellt, sondern zur Herstellung einer permanenten Verbindung zwischen den abgekroepften Plattenenden fuehrt. Diese Art der Verbindung, die auch bei anderen Ausfuehrungsformen Anwendung finden kann, fuehren zur Bildung einer permanent-zylindrichen Druckplatte.As an alternative proposal, as shown in FIG. 8, always with reference to the schematically illustrated variant in FIG. 5, an adhesive or a hardening filling material 9 can also be provided inside the crank. A connection is thus obtained in the axial direction, not a detachable mechanical connection, but rather leads to the establishment of a permanent connection between the cranked plate ends. This type of connection, which can also be used in other embodiments, leads to the formation of a permanently cylindrical pressure plate.

Durch die Erfindung werden die vorgeschlagenen Aufgaben geloest. Die Stossverbindung erlaubt es, in der Praxis die gesamte nutzbare Flaeche des Druckzylinders fuer die Aufnahme des Druckbildes zu nutzen. Die Platte und die dazugehoerige Stossverbindung sind einfach und billig, die Verbindung kann nach Wunsch geloest werden, damit die Platte erneut die Form einer flachen Platte einnimmt. Schliesslich ist ein beschraenkter Platzbedarf fuer die Stossverbindung im Innenraum der Platte erzielbar, Platz, der in einfacher Weise ueber die Vorsehung einer Nut oder einer Ausnehmung in der Oberflaeche des Druckzylinders geschaffen werden kann.The proposed objects are achieved by the invention. The butt joint allows the entire usable area of the printing cylinder to be used for recording the print image in practice. The plate and the associated butt joint are simple and cheap, the connection can be detached if desired so that the plate again takes the form of a flat plate. Finally, a limited space requirement for the butt joint in the interior of the plate can be achieved, space that can be created in a simple manner by providing a groove or a recess in the surface of the pressure cylinder.

Da die Stossverbindung der Plattenraender bereits auf einem anderen Hilfszylinder vorbereitet werden kann und im Anschluss daran auf den eigentlichen Druckzylinder rasch aufspannbar ist, wird eine wesentliche Zeiteinsparung fuer den Wechsel der Druckplatten erzielt, was zu einer erheblichen Leistungssteigerung der Maschine fuehrt.Since the butt joint of the plate edges can already be prepared on another auxiliary cylinder and then on the actual printing cylinder can be quickly clamped, a substantial saving in time for changing the printing plates is achieved, which leads to a considerable increase in performance of the machine.

In den Zeichnungen ist die Stosstelle entlang einer Mantellinie des Zylinders gezeigt, die Verbindung kann aber auch mit Neigung gegenueber der Mantellinie des Zylinders erfolgen, was Vorteile bringt und nur zu einer bescheidenen Einschraenkung der nutzbaren Flaeche auf dem Zylinder fuehrt.In the drawings, the joint along a surface line of the cylinder is shown, but the connection can also be made with an inclination relative to the surface line of the cylinder, which brings advantages and only leads to a modest limitation of the usable area on the cylinder.

Claims (10)

1. Verfahren zum Verbinden der Enden einer Druckplatte fuer den Rotationsdruck, bestehend aus einem metallischen Traegermaterial und einer darauf aufgebrachten fotoempfindlichen Beschichtung, dadurch gekennzeichnet , dass: a) ein Abtragen der fotoempfindlichen Beschichtung (5) an zwei gegenueberliegenden Endstreifen (2, 3) der Platte (1) erfolgt; b) die Bildung einer Abkroepfung (12) an einem Plattenende (2) und ein Abwinkeln (11) des anderen Plattenendes (3) und Einfuehrung in die vorher erstellte Abkroepfung erfolgt und c) ein Vergiessen eines aushaertenden Materials (8, 9) laengs der zwischen den nebeneinanderliegenden Plattenenden (2, 3) der Druckplatte (1) gebildeten Nut zur Erzeugung einer Kontinuitaet in der Oberflaeche der Druckplatte (1) laengs der Plattenverbindung (2, 3) erfolgt. 1. A method for connecting the ends of a printing plate for rotary printing, consisting of a metallic carrier material and a photosensitive coating applied thereon, characterized in that: a) the photosensitive coating (5) is removed on two opposite end strips (2, 3) of the plate (1); b) the formation of a bend (12) at one end of the plate (2) and angling (11) of the other end of the plate (3) and introduction into the previously created bend is carried out and c) a casting of a hardening material (8, 9) along the groove formed between the adjacent plate ends (2, 3) of the pressure plate (1) to produce a continuity in the surface of the pressure plate (1) along the plate connection (2, 3) he follows. 2. Verfahren, nach Patentanspruch 1, dadurch gekennzeichnet , dass die erstellte Stossverbindung (2, 3) in einem Winkel gegenueber der Radialrichtung des gebildeten zylinderfoermigen Koerpers (1) abgebogen wird (Fig. 5).2. The method according to claim 1, characterized in that the butt joint (2, 3) is bent at an angle relative to the radial direction of the cylindrical body (1) formed (FIG. 5). 3. Verfahren, nach Patentanspruch 1, dadurch gekennzeichnet , dass die Stossverbindung (2, 3) zur inneren Umfangsflaeche des erhaltenen zylinderfoermigen Koerpers (1) abgebogen wird (Fig. 6).3. The method according to claim 1, characterized in that the butt connection (2, 3) to the inner peripheral surface of the cylindrical body obtained (1) is bent (Fig. 6). 4. Verfahren, nach einem der Ansprueche 1 - 3, dadurch gekennzeichnet , dass ein Klebstoff (8) im Inneren der winkelartig abgebogenen Kroepfung vorgesehen ist.4. The method according to any one of claims 1 - 3, characterized in that an adhesive (8) inside the angular bent goiter is provided. 5. Verfahren, nach Patentanspruch 4, dadurch gekennzeichnet , dass die fotoempfindliche Beschichtung (5) auf fotochemischem Wege entfernt wird.5. The method according to claim 4, characterized in that the photosensitive coating (5) is removed photochemically. 6. Verfahren, nach Patentanspruch 4, dadurch gekennzeichnet , dass die Beschichtung(5) oder die Beschichtungen (5, 6) von der metallischen Traegerplatte (4) auf mechanische Weise entfernt werden.6. The method according to claim 4, characterized in that the coating (5) or the coatings (5, 6) from the metallic support plate (4) are removed in a mechanical manner. 7. Druckplatte fuer den Rotationsdruck, nach Patentanspruch 1 - 6, dadurch gekennzeichnet , dass die Herstellung der Platte nach dem erfindungsgemaessen Verfahren erfolgt.7. printing plate for rotary printing, according to claims 1-6, characterized in that the production of the plate is carried out according to the inventive method. 8. Druckplatte, nach einem der Ansprueche 1 - 6, dadurch gekennzeichnet, dass die Platte aus ihrer zylindrischen Gestalt in eine im wesentlichen flache Gestalt, durch Entfernen der Klebenaht (8) rueckfuehrbar ist.8. Printing plate, according to one of claims 1 - 6, characterized in that the plate can be returned from its cylindrical shape into a substantially flat shape by removing the adhesive seam (8). 9. Druckplatte, nach Patentanspruch 7, dadurch gekennzeichnet , dass die Stossverbindung radial gegenueber dem von der Platte gebildeten Zylinder angeordnet ist.9. Pressure plate, according to claim 7, characterized in that the butt joint is arranged radially opposite the cylinder formed by the plate. 10. Druckplatte, nach Patentanspruch 7 oder 8, dadurch gekennzeichnet , dass die Stossverbindung geneigt gegenueber der Mantellinie des geformten Zylinders erstreckt.10. Pressure plate, according to claim 7 or 8, characterized in that the butt joint extends inclined relative to the surface line of the shaped cylinder.
EP88114808A 1987-09-11 1988-09-09 Printing plate for rotary printing Expired - Lifetime EP0306986B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114808T ATE91972T1 (en) 1987-09-11 1988-09-09 PRINT PLATE FOR ROTARY PRINTING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2189887 1987-09-11
IT8721898A IT1231223B (en) 1987-09-11 1987-09-11 METHOD FOR JOINING THE ENDS OF A SHEET FOR ROTARY PRINTING AND JOINTING SO OBTAINED

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EP0306986A2 true EP0306986A2 (en) 1989-03-15
EP0306986A3 EP0306986A3 (en) 1989-11-15
EP0306986B1 EP0306986B1 (en) 1993-07-28

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EP88114808A Expired - Lifetime EP0306986B1 (en) 1987-09-11 1988-09-09 Printing plate for rotary printing

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US (1) US4964338A (en)
EP (1) EP0306986B1 (en)
AT (1) ATE91972T1 (en)
DE (1) DE3882625D1 (en)
IT (1) IT1231223B (en)

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US4964338A (en) * 1987-09-11 1990-10-23 Officine Meccaniche G. Cerutti S.P.A. Method of mechanically joining the marginal portions of a blank of a printing plate for rotary printing, and printing plate thus produced
FR2716140A1 (en) * 1994-02-15 1995-08-18 Roland Man Druckmasch A rotary printing press and method for replacing the facing member to be stretched by a cylinder.
EP2286997A4 (en) * 2008-05-27 2012-02-22 Masayuki Izume Plate for printing press and printing press
DE102011084205B4 (en) 2011-10-10 2022-12-08 Koenig & Bauer Ag Method of manufacturing a blanket unit

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US5687647A (en) * 1996-04-26 1997-11-18 Heidelberger Druckmaschinen Ag Plate cylinder with fixed tensioning plate mounting device
FR2763888B1 (en) * 1997-05-28 1999-07-16 Rollin Sa IMPROVED SLEEVE FOR A CYLINDER OF A PRINTING MACHINE OR THE LIKE AND METHOD FOR FITTING THEREOF
US7370579B2 (en) * 2002-12-16 2008-05-13 Koenig & Bauer Aktiengesellschaft Printing blanket assembly for a blanket cylinder and method for producing a printing blanket assembly
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JP3878622B2 (en) * 2004-05-19 2007-02-07 株式会社東京機械製作所 Blanket cylinder filling material
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US4964338A (en) * 1987-09-11 1990-10-23 Officine Meccaniche G. Cerutti S.P.A. Method of mechanically joining the marginal portions of a blank of a printing plate for rotary printing, and printing plate thus produced
FR2716140A1 (en) * 1994-02-15 1995-08-18 Roland Man Druckmasch A rotary printing press and method for replacing the facing member to be stretched by a cylinder.
EP2286997A4 (en) * 2008-05-27 2012-02-22 Masayuki Izume Plate for printing press and printing press
US8635952B2 (en) 2008-05-27 2014-01-28 Masayuki Izume Machine plate for printer and printer
DE102011084205B4 (en) 2011-10-10 2022-12-08 Koenig & Bauer Ag Method of manufacturing a blanket unit

Also Published As

Publication number Publication date
EP0306986B1 (en) 1993-07-28
IT8721898A0 (en) 1987-09-11
EP0306986A3 (en) 1989-11-15
US4964338A (en) 1990-10-23
IT1231223B (en) 1991-11-26
DE3882625D1 (en) 1993-09-02
ATE91972T1 (en) 1993-08-15

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