EP0734861B1 - Procédé et appareil pour le montage de plaques d'impression flexibles - Google Patents

Procédé et appareil pour le montage de plaques d'impression flexibles Download PDF

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Publication number
EP0734861B1
EP0734861B1 EP96102801A EP96102801A EP0734861B1 EP 0734861 B1 EP0734861 B1 EP 0734861B1 EP 96102801 A EP96102801 A EP 96102801A EP 96102801 A EP96102801 A EP 96102801A EP 0734861 B1 EP0734861 B1 EP 0734861B1
Authority
EP
European Patent Office
Prior art keywords
rollers
forme cylinder
format
pressing
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 - Lifetime
Application number
EP96102801A
Other languages
German (de)
English (en)
Other versions
EP0734861A1 (fr
Inventor
Georg Hartung
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 EP0734861A1 publication Critical patent/EP0734861A1/fr
Application granted granted Critical
Publication of EP0734861B1 publication Critical patent/EP0734861B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F27/1206—Feeding to or removing from the forme cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/40—Adjusting means for printing plates on the cylinder
    • B41P2227/41—Adjusting means for printing plates on the cylinder axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/60—Devices for transferring printing plates
    • B41P2227/62—Devices for introducing printing plates

Definitions

  • the invention relates to a method and a device for mounting flexible printing forms according to the preamble of the method or device claim.
  • the printing plates which are referred to as printing plates, are first fastened in a clamping rail assigned to the start of printing and then mounted on the plate cylinder when the plate cylinder rotates forward.
  • the trailing end of the pressure plate is then fastened in the pressure end clamping rail, whereupon the pressure plate is tensioned. So that during the forward rotation of the plate cylinder, the printing plate is snugly drawn onto its outer circumference, it is known to employ one or more adjacent pressure rollers on the plate cylinder over this format width of the printing plate.
  • DE 4 214 207 C1 discloses a device of this type, which is mounted on and off with respect to the plate cylinder and consists of a plurality of individual pressure rollers lying next to one another and rotatably mounted on a common axis. This pressure roller is assigned a folding bar parallel to its axis. This folding bar is used to fold the printing plate around the contour of the printing end.
  • DE 4 321 751 C1 describes a device for the precise clamping of printing plates, which is designed as a manually operable tool with an eccentric curve.
  • This tool can be used to make register corrections in the circumferential and lateral directions.
  • This tool cooperates with a clamping rail assigned to the printing end, which is made of individual sections lying next to one another, so that the individual elements can be moved further apart or closer together.
  • the previously described upsetting or stretching processes at the printing end of the printing plate can therefore be carried out with such a tool.
  • a disadvantage of the above-described upsetting or wide stretches of the printing end of a printing form is, however, that the new printing plate must be corrected accordingly at the end of printing each time the plate is changed.
  • the same manual handling must therefore always be carried out after each printing plate change, which is to be regarded as disadvantageous.
  • the object of the present invention is therefore to develop a method and a device in accordance with the preamble of the respective method or device claim in such a way that at least not to the full extent on a stretching or upsetting to be carried out after each printing plate change.
  • the pressure rollers which can be set on the forme cylinder are set with different contact pressure over the format width of the printing form.
  • the positioning of the pressure rollers can be such that the pressure force in the center of the cylinder size is greater than at the edge areas.
  • the line pressure of the pressure rollers in relation to the forme cylinder is accordingly convex. Such a line pressure curve results when a printing form is drawn onto the form cylinder a so-called spreading effect, ie the printing form is stretched like a fan towards the end of the print.
  • the positioning of the pressure rollers can also be such that the line pressure has a concave course over the width of the forme cylinder, i.e. the contact forces are greater at the format edges than in the format center of the cylinder.
  • the fact that the pressure rollers consist in particular of rubber-covered rollers means that the flexible cover of these rollers is pressed in correspondingly differently, so that the tensile forces on the printing plate, which differ across the format, result.
  • a concave course of the line print results in the effect that the printing plate is compressed towards the end of printing. The printing end of a plate compressed in this way thus prints more closely from the start of printing area.
  • a traverse is arranged parallel to the axis of the pressure rollers and which receives at least one tensioning device, by means of which the axis of the pressure rollers can be bent in an intended manner.
  • a strong bending of the axis of the pressure rollers in the direction of the forme cylinder brings about the above effect, so that the line pressure has a convex course, that is to say the pressing force in the middle of the format is greater than in the format edge regions of the forme cylinder.
  • the bending takes place in a plane that is defined by the axes of the cylinder and the pressure rollers.
  • the axis of the pressure rollers can also be pre-tensioned with respect to the traverse, so that there is a line pressure distribution that is uniform over the format width, so the printing form does not experience any forces in the axial direction of the plate cylinder.
  • the edge length of the printing end thus remains the same as that of the start of printing .
  • the printing plate therefore does not experience any changes in shape.
  • Fig. 2 shows a plate cylinder 1 of a sheet-fed offset printing press designed as a plate cylinder.
  • a common axis 3 are rotatably mounted side by side as sleeve-shaped pressure rollers 2 provided with an elastic material.
  • the common axis 3 of these pressure rollers 2 is fastened at its two ends in each case in lever arm-shaped receptacles of a crossbar 4 extending over the format width of the forme cylinder 1.
  • the cross member 4 is in turn supported in its two ends in a swivel joint on the side frame walls 5 of the printing press.
  • the actuating rollers 2 are turned on and off against the lateral surface of the forme cylinder 1 by adjusting means (not shown).
  • the line pressure 7 is indicated with respect to the forme cylinder 1, with the tensioning screws 6 and the consequent bending of the axis 3 resulting in a convex course over the format width of the forme cylinder 1.
  • the pressure rollers 2 lying in the center of the format of the forme cylinder 1 are pressed more strongly on its circumference than the pressure elements lying on the format edges.
  • the individual pressure rollers 2 are thus placed on the contact line to the forme cylinder 1 with different forces, so that there are correspondingly different impressions in the elastic outer material.
  • These different development ratios result in stretching forces acting outwards in the axial direction of the forme cylinder 1, so that the printing plate 8 shown above the forme cylinder 1 in FIG. 1 is stretched at its printing end DE.
  • the beginning of printing of the printing plate 8 is marked with DA.
  • the printing end edge of the printing plate 8 also has a covex shape due to the spreading effect impressed in this way.
  • the original rectangular shape of the pressure plate 8 is dashed in FIG. 1.
  • a printing plate 8 drawn up in this way has a printing end edge that is shorter than the edge at the beginning of printing DA. Due to the deformation forces, the pressure end edge of the pressure plate 8 is also formed into a concave shape.
  • the axis 3 was tensioned in relation to the crossbar 4 by the tensioning screws 6, so that the deflection of the axis 3 caused by these forces is just compensated for by the contact force of the pressure rollers 2.
  • the individual pressure rollers 2 experience an even indentation at the contact area with the forme cylinder 1, so that there is also a constant development over their width.
  • the indentation in the elastic outer material of the pressure rollers 2 thus only creates tensile forces in the circumferential direction of the forme cylinder 1.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (5)

  1. Procédé pour monter des supports d'impression flexibles sur le cylindre porte-clichés d'une machine d'impression à feuilles, en particulier pour monter des plaques d'impression sur le cylindre porte-plaque d'une machine d'impression offset, pour lequel des galets de pressage s'étendant sur la largeur de format du cylindre porte-clichés et munis d'une enveloppe externe élastiquement déformable sont mis au contact de celui-ci,
    caractérisé en ce que la force de pressage, par laquelle les galets de pressage (2) sont mis au contact du cylindre porte-clichés (1), peut être réglée différemment sur sa largeur de format.
  2. Procédé selon la revendication 1,
    caractérisé en ce que les galets de pressage (2) associés au centre du format du cylindre porte-clichés (1) sont mis au contact plus fortement du cylindre porte-clichés que les galets de pressage (2) associés aux bords du format du cylindre porte-clichés (1) de manière à obtenir une pression linéaire (7) présentant un trajet convexe.
  3. Procédé selon la revendication 1,
    caractérisé en ce que les galets de pressage (2) associés aux bords du format du cylindre porte-clichés (1) sont mis au contact plus fortement du cylindre porte-clichés que les galets de pressage (2) au centre du format du cylindre porte-clichés (1) de manière à obtenir un trajet concave de la pression linéaire (7).
  4. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comportant des galets de pressage (2) qui sont montés de façon rotative sur un axe commun (3) et sont agencés par rapport au cylindre porte-clichés de manière à pouvoir être mis au contact et écartés de la périphérie externe du cylindre porte-clichés (1),
    caractérisé en ce que l'on prévoit, parallèlement à l'axe (3) des galets de pressage (2), une traverse (4), et on prévoit entre celle-ci et l'axe (3) au moins un dispositif tendeur par lequel l'axe (3) peut être déformé.
  5. Dispositif selon la revendication 4,
    caractérisé en ce que le dispositif tendeur est réalisé sous forme d'une vis tendeuse (6) qui est vissée à travers un filetage dans la traverse (4) et prend appui par son extrémité libre sur l'axe (3).
EP96102801A 1995-03-25 1996-02-24 Procédé et appareil pour le montage de plaques d'impression flexibles Expired - Lifetime EP0734861B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19511075 1995-03-25
DE19511075A DE19511075A1 (de) 1995-03-25 1995-03-25 Verfahren und Vorrichtung zum Aufziehen flexibler Druckformen

Publications (2)

Publication Number Publication Date
EP0734861A1 EP0734861A1 (fr) 1996-10-02
EP0734861B1 true EP0734861B1 (fr) 1997-10-15

Family

ID=7757789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102801A Expired - Lifetime EP0734861B1 (fr) 1995-03-25 1996-02-24 Procédé et appareil pour le montage de plaques d'impression flexibles

Country Status (3)

Country Link
EP (1) EP0734861B1 (fr)
AT (1) ATE159202T1 (fr)
DE (2) DE19511075A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10001324B4 (de) * 2000-01-14 2011-02-24 Koenig & Bauer Aktiengesellschaft Einrichtung und Verfahren zum Aufziehen flexibler Druckformen
DE10001319B4 (de) * 2000-01-14 2011-02-24 Koenig & Bauer Aktiengesellschaft Einrichtung und Verfahren zum Aufziehen flexibler Druckformen auf den Plattenzylinder einer Druckmaschine
DE20316404U1 (de) * 2003-10-24 2003-12-24 Man Roland Druckmaschinen Ag Andrückelement in einer Druckmaschine
CN101830105B (zh) * 2009-03-13 2014-04-09 海德堡印刷机械股份公司 用于供应印版的方法和装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214207C1 (fr) * 1992-04-30 1993-07-22 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE4215969C2 (de) * 1992-05-18 1994-10-13 Roland Man Druckmasch Vorrichtung zum Zuführen von Druckplatten auf den Plattenzylinder von Druckmaschinen, insbesondere Bogenoffsetdruckmaschinen
DE4217941C2 (de) * 1992-05-30 1994-10-06 Koenig & Bauer Ag Verfahren und Vorrichtung zum paßgenauen Aufbringen von Klischees
DE4231906C2 (de) * 1992-09-18 1995-10-12 Koenig & Bauer Ag Einrichtung zum Zuführen und Abführen von Druckplatten zu und von einem Plattenzylinder
DE4321751C1 (de) * 1993-06-30 1994-11-24 Roland Man Druckmasch Vorrichtung zum paßgenauen Spannen von Druckplatten auf dem Plattenzylinder von Druckmaschinen
DE4424903C2 (de) * 1994-01-17 1998-08-27 Koenig & Bauer Albert Ag Vorrichtung zur Montage, Demontage und Transport von leicht biegbaren, bogenförmigen Gegenständen mit Einhängeabkantungen
DE4420971C1 (de) * 1994-06-16 1995-07-20 Roland Man Druckmasch Verfahren und Vorrichtung zum Aufziehen flexibler Druckformen

Also Published As

Publication number Publication date
DE19511075A1 (de) 1996-09-26
EP0734861A1 (fr) 1996-10-02
ATE159202T1 (de) 1997-11-15
DE59600032D1 (de) 1997-11-20

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