EP0600231B1 - Dispositif pour fixer en position de registre des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer - Google Patents

Dispositif pour fixer en position de registre des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer Download PDF

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Publication number
EP0600231B1
EP0600231B1 EP93117555A EP93117555A EP0600231B1 EP 0600231 B1 EP0600231 B1 EP 0600231B1 EP 93117555 A EP93117555 A EP 93117555A EP 93117555 A EP93117555 A EP 93117555A EP 0600231 B1 EP0600231 B1 EP 0600231B1
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EP
European Patent Office
Prior art keywords
cylinder
printing
plate
clamping rail
tensioning
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 - Lifetime
Application number
EP93117555A
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German (de)
English (en)
Other versions
EP0600231A1 (fr
Inventor
Georg Hartung
Gerhard Augsberg
Helmut Schild
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0600231A1 publication Critical patent/EP0600231A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1231—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by translatory motion substantially tangential to support surface

Definitions

  • the invention relates to a device for register-accurate clamping of printing plates on the plate cylinder of printing machines, in particular sheetfed offset printing machines, according to the preamble of claim 1.
  • the plate cylinders of sheetfed offset printing presses have an axially parallel cylinder channel, in which a clamping rail assigned to the start of printing of the printing plate and a clamping rail assigned to the printing end of the printing plate are arranged.
  • a printing plate to be applied to the plate cylinder is first releasably attached with its leading end to corresponding devices of the clamping rail, then placed around the outer periphery of the plate cylinder and then attached with its trailing end to corresponding devices of a clamping rail.
  • the printing plate is then clamped by exerting a corresponding tension on the printing end area of the printing plate via the tensioning rail.
  • the tensioning rail assigned to the printing end is usually shifted or pivoted in corresponding guides to the center of the cylinder pit.
  • DE 4 129 831 A1 describes a device for clamping printing plates on the plate cylinder of printing machines, in which the clamping rail assigned to the start of printing is fixedly attached to the bottom of the channel of the plate cylinder and a device for automatically or remotely operable clamping of the leading end of the printing plate in just has the clamping rail. Since the Means for automatically or remotely operable clamping the pressure start area of the printing plate already make this known clamping rail quite complex, a movable mounting or the like of this clamping rail is not provided with respect to the body of the plate cylinder. With the dowel pins also described in this document in the receiving area for the printing plate front edge, this clamping rail thus represents a cylinder-fixed register system. Corrections of the printing plate front edge are therefore not possible.
  • a device for tensioning printing plates in which the front and rear tensioning rails simultaneously have a tensioning force on the beginning and end of the printing area via a common actuating device Apply pressure plate.
  • This type of printing plate tension also moves the edge of the printing plate assigned to the start of printing, thus giving up the advantages of a cylinder-fixed register system, particularly in the case of a device for remotely operable clamping and releasing, as recognized from the first-mentioned document.
  • DE 3 806 526 C2 describes a clamping rail for the leading edge of a pressure plate, which is elastically supported in relation to the plate cylinder in the circumferential direction via leaf spring elements.
  • the front clamping rail can be adjusted almost in the circumferential direction using clamping screws.
  • the clamping rails must have a very high strength / stability, so that the articulation proposed here by means of leaf springs cannot be realized without major problems.
  • an actuating device which is supported in a cylinder-fixed manner, for clamping the pressure plate will already cause the clamping rail suspended in this way to be flexurally elastic when a sufficiently large clamping force is generated.
  • EP 0 429 808 A1 discloses a clamping rail for the printing start area of a printing plate, which is movably mounted in the cylinder channel in the circumferential direction within a certain travel range.
  • This known clamping rail is pressed against a zero stop, which is attached in the middle of the cylinder channel, via spring elements supported on the front channel wall.
  • There are also set screws by means of which the clamping rail can be adjusted against the force of the spring means in the direction of the front channel wall.
  • only one device is proposed, by means of which all the adjusting screws can be adjusted together, which then results in a parallel movement of the clamping rail in the direction of the start of printing.
  • the object of the present invention is thus to extend a device according to the features of the preamble of claim 1 in such a way that register-accurate clamping of the printing plate is possible and, in particular, that the printing plate is always correctly supported in the folding area at the start of printing.
  • the associated with the beginning of the pressure and firmly anchored to the bottom of the cylinder channel clamping rail is bent elastically by a remotely operable bending device after tensioning the pressure plate over the tensioning rail of the printing end, so that the part of the pressure plate attached to the clamping rail is one predetermined distance is pushed away almost in the circumferential direction of the plate cylinder from the front channel wall.
  • the intended distance by means of which the printing plate is pulled at the start of printing is of the order of 1/10 mm.
  • a printing plate which is possibly hollow or not sufficiently sufficiently lying in the beginning of the printing area is re-tensioned without there being excessive tensile force on the printing plate and, on the other hand, the register-correct position of the beginning of printing on the printing plate is changed.
  • the remotely operable bending device elastically presses the clamping rail firmly anchored to the bottom of the cylinder channel away from the front channel wall, so that a tension is created on the pressure plate of the intended size.
  • a pivotable or straight-line mounting of the front clamping rail is explicitly not provided. This considerably simplifies the construction effort and additionally ensures sufficient stability and positional accuracy of the clamping rail with respect to the plate cylinder. Since the pressure plate is re-tensioned from the beginning of the pressure via the bending device by means of elastic deformation of the clamping rail, no spring means are therefore necessary for the intended distances. After resetting the bending device, the clamping rail returns to its starting position (zero position).
  • the invention makes use of the knowledge that in most cases an incorrect resting of the printing plate in the bent area at the beginning of printing can be compensated for by a slight re-tensioning in the range of 1/10 mm. Building on this, the invention also makes use of the knowledge that with such a small tensioning section, a correspondingly articulated arrangement of the clamping rail with respect to the plate cylinder is unnecessary. Since max. 40% of the clamping force of the tension exerted on the clamping rail from the end of the pressure therefore does not require a great deal of force to effect the re-tensioning of the intended distance.
  • the drive to be provided inside or outside the plate cylinder for the bending device can, with appropriate translation and a forceful design for tensioning the printing plate via the printing end tensioning rail, likewise likewise bring about the corresponding deformation of the clamping rail of the start of printing.
  • the bending device provided according to the invention can advantageously consist of a plurality of clamping screws which support the clamping rail on the front duct wall and which have a common one Actuating device can be rotated simultaneously and by the same angular amount. This causes the tensioning screws supported on the front duct wall to push the clamping rail away from it evenly over the width of the format parallel to the start of printing.
  • tensioning screw is generally understood to mean a screw gear or screw joint by means of which the tensioning rail is supported by the channel wall assigned to it.
  • the same effect can be achieved, for example, by one or more profile or eccentric shafts arranged between the clamping rail and the front duct wall in the upper region of the cylinder duct, which are rotated by a predetermined angular amount via a drive.
  • a shaft with a plurality of curves or eccentrics arranged in sections would also be advantageously used.
  • the invention is very advantageous if the bending device is constructed, as will be shown in the exemplary embodiment.
  • the individual clamping screws or screw joints, which bring about the bending of the clamping rail relative to the cylinder-fixed attachment, and the common actuating device are arranged in a space-saving manner below the start of pressure between the clamping rail and the front channel wall of the cylinder pit.
  • the drive for the bending device can be, for example, a motor provided inside the plate cylinder (pneumatic, hydraulic, electrical), which also causes the clamping and tensioning of the printing plate via the tensioning rail of the printing end via a switchable gear or a similar force distributor.
  • the drive for the bending device can, however, also be arranged on one or both frame sides of the printing press and, after a corresponding angular positioning of the plate cylinder, act on a corresponding actuating element, for example on the end face.
  • An example this would be a pneumatic cylinder with a roller lever, the pivotable end of which can be adjusted to a pivotable actuating element, for example in the form of a lever arm, in the case of a plate cylinder position.
  • the bending device according to the invention for example in the form of the common adjustable clamping screws, generally provides self-locking and non-reactive devices. Since a very high force already arises due to the elastic deformation of the clamping rail with respect to its anchoring, the effective frictional forces result in a secure locking, which prevents the tension from loosening automatically during printing operation.
  • FIG. 1 shows the part of a plate cylinder 1 associated with the start of printing, with the cylinder channel 2 and the clamping rail 3 arranged therein. In the exemplary embodiment, this is supported by a total of four clamping screws 4 on the wall 5 of the cylinder pit 2 associated with the start of printing.
  • the clamping screws 4 are arranged in the area between the front clamping rail 3 and the wall 5 of the cylinder channel 2 assigned to the start of pressure.
  • One end of the clamping screws 4 is screwed into threaded bushes 4.1 which are supported on the cylinder.
  • threaded bushes 4.1 which are supported on the cylinder.
  • each of the adjusting screws 4.2 which are turned through the clamping rail 3 are supported.
  • These adjusting screws 4.2 have, for example, a spherical end and are used for the basic setting of the clamping rail 3 in order to align it exactly parallel to the nominal start of pressure of the plate cylinder 1 in an initial position.
  • FIGS. 1 and 2b shows a section through the clamping rail 3, which consists of an upper and a lower clamping strip 6, 7 in a manner known per se.
  • the lower terminal block 7 is mounted displaceably relative to the upper terminal block 6 and can be opened by pneumatic or mechanical drive means (not shown) for inserting a pressure plate into a gap 8 formed between the upper and lower terminal strips 6, 7 and closed for subsequent clamping.
  • the upper terminal block 6 is screwed directly to the bottom of the cylinder channel 2 by means of several fastening screws 6.1 (see FIGS. 1 and 2b).
  • the upper terminal block 6 is thus cylindrical except for an elastic deformability to be explained.
  • the adjusting screws 4.2 are each provided with a thread and rotated through corresponding threaded holes in the upper terminal block 6. For example, through elongated holes in the lower terminal block 7, the adjusting screws 4.2 are passed through it, so that the lower terminal block 7 has the required displaceability relative to the upper terminal block 6.
  • the clamping rail 3 is in the starting position (before tensioning the pressure plate) parallel to wall 5 or to the start of printing (adjusting screws 4.2).
  • the clamping rail 3 is pressed away from the wall 5 of the cylinder channel 2 when the part of the upper clamping rail 6 anchored to the bottom of the cylinder channel 2 and the fastening screws 6.1 are elastically deformed.
  • the gap 8 with the pressure plate introduced and not shown in FIG. 2b executes a short displacement path in the direction of the center of the cylinder channel 2 (to the left in FIG. 2b).
  • the inserted in the gap 8, clamped and already stretched over the not shown tensioning rail of the printing end is thus stretched again by a short distance by pivoting all tensioning screws 4 in the area of the start of printing.
  • actuating rod 9 which is displaceably mounted in the axial direction of the plate cylinder 1.
  • the actuating rod 9 thus forms part of the bending device 12 according to the invention together with the tensioning screws 4 and the threaded bushes 4.1.
  • the ends of the clamping screws 4 have lever arms 10, the pivotable ends of which are fork-shaped.
  • the lever arms 10 are by the max. recesses provided for the clamping screws 4 (for example, 60 °) lead out recesses in the threaded bushes 4.1.
  • the fork-shaped ends of the lever arms 10 of each clamping screw 4 are each attached to a driving pin 11 attached to the adjusting rod 9.
  • the distances between the driving pins 11 on the adjusting rod 9 correspond to those of the clamping screws 4.
  • the arrangement described can be designed in such a way so that the clamping rail 3 is in the starting position shown in FIG. 1 when the lever arms 10 are pivoted into the position shown in FIG. 2a.
  • the bending device 12 assigned to the clamping rail 3 can be controlled via a remotely controllable actuating element 13.
  • the actuating element 13, which is shown symbolically in Fig. 3, causes in this embodiment that the adjusting rod 9 by the max. the intended path is shifted between one and the other end position.
  • the clamping rail 3 is thus in the unstressed or slightly pretensioned state in the initial position almost on the wall 5 of the cylinder pit 2 or is by the max. the proposed amount of travel pushed away from this.
  • the remotely controllable actuating element 13 can be, for example, a motor (pneumatic, hydraulic, electrical) arranged directly in the plate cylinder 1 or in the cylinder channel 2, which receives its corresponding supply power via a rotary transformer or swivel joint.
  • the actuating element 13 can, however, also consist of a machine-fixed device which, after the plate cylinder 1 has been appropriately positioned, acts on a gear element, in particular in the form of a lever, which is arranged on the end face and causes the actuating rod to be displaced via a mechanism.

Landscapes

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

Claims (8)

  1. Dispositif pour tendre de façon repérée des plaques d'impression sur le cylindre porte-plaque de machines d'impression, en particulier des machines d'impression offset à feuilles, comportant une barre de serrage (3) agencée de façon fixe dans un canal de cylindre (2) parallèle à l'axe et associée au début de l'impression de la plaque d'impression, ainsi qu'une barre de tension associée à la fin de l'impression de la plaque d'impression et permettant de tendre, de façon proprement dite, la plaque d'impression,
    caractérisé en ce que, à la barre de serrage (3) fixée au fond du canal de cylindre (2), il est associé un dispositif de flexion (12) en plus d'un élément d'actionnement (13) pouvant être télécommandé, au moyen duquel la barre de serrage (3) peut être pivotée, par déformation élastique de celle-ci, sur une course prédéfinie en direction du centre du canal de cylindre (2).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que le dispositif de flexion (12) est formé par plusieurs vis de serrage (4), au moyen desquelles la barre de serrage (3) est appuyée contre la paroi (5) du canal de cylindre (2), et qui peuvent être actionnées ensemble par l'intermédiaire d'un dispositif associé.
  3. Dispositif selon la revendication 2,
    caractérisé en ce que les vis de serrage (4) sont agencées entre la barre de serrage (3) et la paroi (5) du canal de cylindre (2) et sont vissées, par une extrémité, dans des douilles filetées (4.1) montées de façon solidaire du cylindre.
  4. Dispositif selon la revendication 3,
    caractérisé en ce que, à chaque vis de serrage (4), il est associé une vis de réglage (4.2) agencée dans la barre de serrage (3), grâce à laquelle la barre de serrage (3) s'appuie sur les vis de serrage (4).
  5. Dispositif selon une des revendications 2 à 4,
    caractérisé en ce que les vis de serrage (4) présentent des bras de levier (10) et ceux-ci sont articulés à une bielle (9) montée de façon mobile en direction axiale du cylindre porte-plaque (1).
  6. Dispositif selon la revendication 5,
    caractérisé en ce que la bielle (9) présente des boulons d'entraînement (11) qui s'engagent dans des pièces en forme de fourche des extrémités pivotantes des bras de levier (10) des vis de serrage (4).
  7. Dispositif selon une des revendications précédentes,
    caractérisé en ce que l'élément d'actionnement (13) télécommandable et associé au dispositif de flexion (12) présente un moteur agencé dans le cylindre porte-plaque (1).
  8. Dispositif selon une des revendications 1 à 6,
    caractérisé en ce que l'élément d'actionnement (13) télécommandable et associé au dispositif de flexion (12) présente un entraînement agencé de façon solidaire de la machine, qui, après un positionnement angulaire du cylindre porte-plaque (1), introduit dans celui-ci la force d'actionnement.
EP93117555A 1992-12-02 1993-10-29 Dispositif pour fixer en position de registre des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer Expired - Lifetime EP0600231B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4240462A DE4240462C2 (de) 1992-12-02 1992-12-02 Vorrichtung zum registergenauen Aufspannen von Druckplatten auf dem Plattenzylinder von Druckmaschinen
DE4240462 1992-12-02

Publications (2)

Publication Number Publication Date
EP0600231A1 EP0600231A1 (fr) 1994-06-08
EP0600231B1 true EP0600231B1 (fr) 1996-12-11

Family

ID=6474168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93117555A Expired - Lifetime EP0600231B1 (fr) 1992-12-02 1993-10-29 Dispositif pour fixer en position de registre des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer

Country Status (3)

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EP (1) EP0600231B1 (fr)
AT (1) ATE146130T1 (fr)
DE (2) DE4240462C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ297967B6 (cs) * 2000-08-25 2007-05-09 Heidelberger Druckmaschienen Ag Zarízení na prestavování minimálne jednoho prvku registru v tiskovém stroji a zpusob k provádení takového prestavování

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1244808B (de) * 1965-02-08 1967-07-20 Planeta Veb Druckmasch Werke Plattenzylinder fuer mit elastisch biegsamen Druckformen arbeitende Rotationsdruckmaschinen
DD69615A1 (de) * 1968-10-23 1969-11-05 Verfahren und Vorrichtung zum Spannen von biegsamen Druckplatten auf dem Formzylinder von Bogenrotations- Druckmaschinen
DE3806526A1 (de) * 1988-03-01 1989-09-14 Heidelberger Druckmasch Ag Vorrichtung zum spannen von biegsamen druckplatten am plattenzylinder von rotationsdruckmaschinen
DE3933678A1 (de) * 1989-10-09 1991-04-18 Miller Johannisberg Druckmasch Vorrichtung zum positionsgenauen spannen einer druckplatte auf einem druckzylinder
DE4129831C3 (de) * 1990-12-21 1998-08-13 Heidelberger Druckmasch Ag Schnellklemmvorrichtung
EP0492138B1 (fr) * 1990-12-21 1995-11-15 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif de fixation rapide
DE9210964U1 (de) * 1991-08-16 1992-11-12 Koenig & Bauer AG, 8700 Würzburg Einrichtung zum Spannen und Justieren von biegsamen Druckplatten auf Plattenzylindern von Rotationsdruckmaschinen
DE4214167A1 (de) * 1992-04-30 1993-11-04 Roland Man Druckmasch Vorrichtung zum schraenken von druckplatten auf dem plattenzylinder von druckmaschinen, insbesondere bogenoffsetdruckmaschinen

Also Published As

Publication number Publication date
ATE146130T1 (de) 1996-12-15
DE59304747D1 (de) 1997-01-23
DE4240462C2 (de) 1994-09-22
EP0600231A1 (fr) 1994-06-08
DE4240462A1 (de) 1994-06-16

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