EP0734861A1 - Method and apparatus for mounting flexible printing plates - Google Patents

Method and apparatus for mounting flexible printing plates Download PDF

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Publication number
EP0734861A1
EP0734861A1 EP96102801A EP96102801A EP0734861A1 EP 0734861 A1 EP0734861 A1 EP 0734861A1 EP 96102801 A EP96102801 A EP 96102801A EP 96102801 A EP96102801 A EP 96102801A EP 0734861 A1 EP0734861 A1 EP 0734861A1
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EP
European Patent Office
Prior art keywords
pressure rollers
format
pressure
printing
forme cylinder
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Granted
Application number
EP96102801A
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German (de)
French (fr)
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EP0734861B1 (en
Inventor
Georg Hartung
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0734861A1 publication Critical patent/EP0734861A1/en
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    • 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 a uniform indentation in 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)

Abstract

The contact pressure with which the contact pressure rollers (2) are set against the plate cylinder (1) is variable over the format width. The contact pressure rollers associated with the format centre of the cylinder are placed more heavily against the latter than the rollers associated with the format edges so that a linear pressure (7) is produced with convex path. Alternatively the rollers at the edges are more heavily stressed to produce a concave path of the linear pressure. The rollers are mounted rotatable on a common axis (3) with a tension device between the axis and cross bar (4) set parallel to same.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Aufziehen flexibler Druckformen gemäß dem Oberbegriff des Verfahrens- bzw. Vorrichtungsanspruches.The invention relates to a method and a device for mounting flexible printing forms according to the preamble of the method or device claim.

Bei Bogenoffsetdruckmaschinen werden die als Druckplatten bezeichneten Druckformen zunächst in einer dem Druckanfang zugeordneten Klemmschiene befestigt und sodann bei Vorwärtsdrehen des Plattezylinders auf diesen aufgezogen. Daraufhin erfolgt das Befestigen des nachlaufenden Endes der Druckplatte in der Druckende-Spannschiene, woraufhin das Spannen der Druckplatte erfolgt. Damit während des Vorwärtsdrehen des Plattenzylinders die Druckplatte satt auf dessen Außenumfang aufgezogen wird, ist es bekannt, während dieses Aufziehens über die Formatbreite der Druckplatte eine oder mehere nebeneinanderliegende Andrückrollen an den Plattenzylinder anzustellen. Eine derartige an- und abstellbar bezüglich dem Plattenzylinder gelagerte Einrichtung, welche aus mehreren nebeneinanderliegenden und drehbar auf einer gemeinsamen Achse aufgezogenen einzelnen Andruckrollen besteht, ist aus der DE 4 214 207 C1 bekannt. Dieser Andrückrolle ist parallel zu deren Achse eine Abkantleiste zugeordnet. Mittels dieser Abkantleiste erfolgt das Abkanten der Druckplatte um die Kontur des Druckendes.In sheet-fed offset printing presses, 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.

Gerade bei großformatigen Bogenoffsetdruckmaschinen ist es vielfach nötig, die Druckplanen an deren Druckende entsprechend dem Papierverzug in Achsrichtung des Zylinders zu strecken bzw. zu stauchen. Die DE 4 321 751 C1 beschreibt dazu eine Vorrichtung zum passgenauen Spannen von Druckplatten, welche als ein von Hand betätigbares Werkzeug mit einer exzentrischen Kurve ausgebildet ist. Mit diesem Werkzeug lassen sich Registerkorrekturen in Umfangs- und Seitenrichtung durchführen. Dieses Werkzeug wirkt dabei mit einer dem Druckende zugeordneten Spannschiene zusammen, welche aus einzelnen nebeneinanderliegenden Abschnitten gefertigt ist, so daß die einzelnen Elemente weiter auseinander bzw. enger zusammen gerückt werden können. Die zuvorstehend beschriebenen Stauch- bzw. Streckvorgänge am Druckende der Druckplatte lassen sich also mit einem derartigen Werkzeug durchführen.With large-format sheetfed offset presses in particular, it is often necessary to stretch or compress the printing tarpaulin at the end of its printing in accordance with the paper warp in the axial direction of the cylinder. 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.

Nachteilig bei dem oben beschriebenen Stauchen bzw. breiter Strecken des Druckendes einer Druckform ist aber, daß bei jedem Plattenwechsel die neue Druckplatte am Druckende entsprechend korrigiert werden muß. Bei unterschiedlichen Druckaufträgen mit gleichen oder ähnlichen Bedruckstoffen sind somit stets die gleichen manuellen Handhabungen nach jedem Druckplattenwechsel durchzuführen, was als nachteilig anzusehen ist.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. In the case of different print jobs with the same or similar substrates, the same manual handling must therefore always be carried out after each printing plate change, which is to be regarded as disadvantageous.

Aus der nicht vorveröffentlichten DE-Patentanmeldung P 4 420 971.1 ist es bekannt, eine flexible Druckform, welche insbesondere als ein Flexoklischee ausgebildet ist, durch Zugkräfte in Umfangs- und Seitenrichtung lediglich an den Randbereichen der Druckform einwirkend auf den Formzylinder aufzuziehen. Vorrichtungsgemäß finden hier den Formaträndern der Druckform zugeordnete Rollen Verwendung, deren Achsen in einem Winkel zur Achse des Formzylinders stehen. Beim Aufziehen der Druckform entstehen somit Zugkräfte auf die Druckform in Achsrichtung des Formzylinders, so daß auf eine durchgehende Andrückrolle verzichtet werden kann. Dies ist auch Hauptziel der nicht vorveröffentlichten Anmeldung, da gerade bei als Flexoklischees ausgebildeten Druckformen wegen der tiefliegenden, nichtdruckenden Bereiche mit einer durchgehenden Andrückrolle keine definierten Aufzugskräfte in Umfangsrichtung des Plattenzylinders zu erzielen wären.From the unpublished DE patent application P 4 420 971.1 it is known to pull a flexible printing form, which is designed in particular as a flexo cliché, by tensile forces in the circumferential and lateral directions acting only on the edge regions of the printing form on the forme cylinder. According to the device, rolls assigned to the format edges of the printing form are used here, the axes of which are at an angle to the axis of the forme cylinder. When the printing form is pulled up, tensile forces are thus exerted on the printing form in the axial direction of the forme cylinder, so that there is no need for a continuous pressure roller. This is also the main aim of the non-prepublished application, since in the case of printing forms designed as flexo-clichés, because of the deep-lying, non-printing areas with a continuous pressure roller, no defined elevator forces in the circumferential direction of the plate cylinder could be achieved.

Aufgabe der vorliegenden Erfindung ist es daher ein Verfahren sowie eine Vorrichtung gemäß dem Oberbegriff des jeweiligen Verfahrens- bzw. Vorrichtungsanspruches derartig weiterzubilden, so daß auf ein nach jedem Druckplattenwechsel durchzuführendes Strecken bzw. Stauchen zumindest nicht im vollen Umfang durchzuführen ist.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.

Gelöst wird diese Aufgabe durch den Verfahrens- bzw. Vorrichtungsanspruch. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This task is solved by the process or device claim. Further developments of the invention result from the subclaims.

Gemäß der Erfindung ist vorgesehen, daß die an den Formzylinder anstellbaren Andrückrollen mit über die Formatbreite der Druckform unterschiedlicher Anpreßkraft angestellt werden. Das Anstellen der Andrückrollen kann dabei dergestalt sein, daß die Andruckkraft in der Formatmitte des Zylinders größer ist als an den Randbereichen. Der Liniendruck der Andrückrollen gegenüber dem Formzylinder ist dementsprechend konvex. Beim Aufziehen einer Druckform auf den Formzylinder ergibt ein derartiger Liniendruckverlauf eine sogenannte Breitstreckwirkung, d.h. die Druckform wird fächerartig zum Druckende hin gestreckt.According to the invention it is provided that 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.

Das Anstellen der Andrückrollen kann auch dergestalt sein, so daß der Liniendruck einen konkaven Verlauf über die Breite des Formzylinders aufweist, d.h. die Anpreßkräfte sind an den Formaträndern größer als in der Formatmitte des Zylinders. Dadurch das die Andrückrollen insbesondere aus mit Gummi bezogenen Rollen bestehen, ergibt sich, daß der flexible Bezug dieser Rollen entsprechend unterschiedlich stark eingedrückt wird, so daß dadurch die über die Formatbreite unterschiedlichen Zugkräfte auf die Druckplatte entstehen. Ein konkaver Verlauf des Liniendrucks ergibt dabei die Wirkung, daß die Druckplatte zum Druckende hin gestaucht wird Das Druckende einer derartig gestauchten Platte druckt somit enger aus der Druckanfangbereich.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.

Vorrichtungsgemäß ist vorgesehen, daß parallel zu der Achse der Andrückrollen eine Traverse angeordnet ist, welche wenigstens eine Spannvorrichtung aufnimmt, vermittels der die Achse der Andrückrollen in einer vorgesehenen Weise verbiegbar ist. Ein starkes Verbiegen der Achse der Andrückrollen in Richtung Formzylinder bewirkt dabei den zuvorstehenden Effekt, so daß der Liniendruck einen konvexen Verlauf aufweist, die Andruckkraft also in der Formatmitte größer ist als in den Formatrandbereichen des Formzylinders. Die Verbiegung erfolgt dabei in einer Ebene, die durch die Achsen des Zylinders und der Andrückrollen definiert ist.According to the device, it is provided that 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.

Wird nur eine geringe Vorspannung eingestellt, d.h. die Achse der einzelnen Andrückrollen nur geringfõrmig zum Formzylinder hin vorgebogen, so kann aufgrund der Durchbiegung der Achse der Andrückrollen durch die Kraft des Anstelltens erreicht werden, daß die an den Formaträndern liegenden Andrückrollen stärker gegen den Formzylinder gestellt werden als die in der Formatmitte liegenden Elemente. Es ergibt sich somit ein konkaver Liniendruckverlauf, so daß durch die beschriebenen Verformungen im elastischen Material der Andrückrollen während des Aufziehvorganges Kräfte auf die Druckform ausgeübt werden, welche von den Formaträndern her die Druckplatte zusammenzuschieben versuchen, so daß es zu einem Stauchen der Druckform zu deren Druckende hin kommt.If only a slight pretension is set, ie the axis of the individual pressure rollers is only slightly bent towards the forme cylinder, it can be achieved due to the deflection of the axis of the pressure rollers that the pressure rollers lying on the format edges are placed more strongly against the forme cylinder than the elements in the middle of the format. This results in a concave line pressure curve, so that due to the described deformations in the elastic material of the pressure rollers during the mounting process, forces are exerted on the printing form, which try to push the printing plate together from the format edges, so that it compresses the printing form at the end of its printing comes there.

Durch die erfindungsgemäß vorgesehene Spanneinrichtung kann dabei die Achse der Andrückrollen auch derartig gegenüber der Traverse vorgespannt sein, so daß sich eine über die Formatbreite gleichmäßige Liniendruckverteilung ergibt, die Druckform also keinerlei Kräfte in Achsrichtung des Plattenzylinders erfährt Die Kantenlänge des Druckendes bleibt somit gleich der des Druckanfanges. Die Druckplatte erfährt somit keinerlei Formänderungen.Due to the tensioning device provided according to the invention, 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.

Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der Zeichnungen. Hierbei zeigt:

Fig. 1
die Vorspannung der Andrückrollen zum Strecken der Druckplatte,
Fig. 2
die Andrückrollen mit einem Liniendruckverlauf zum Stauchen des Druckplattenendes,
Fig. 3
eine Vorspannung der Achse der Andrückrollen mit einem konstanten Liniendruckverlauf.
Furthermore, an embodiment of the invention is explained with reference to the drawings. Here shows:
Fig. 1
the pre-tension of the pressure rollers to stretch the pressure plate,
Fig. 2
the pressure rollers with a line pressure curve for upsetting the pressure plate end,
Fig. 3
a preload on the axis of the pressure rollers with a constant line pressure curve.

Fig. 2 zeigt einen als Plattenzylinder ausgebildeten Formzylinder 1 einer Bogenoffsetdruckmaschine. Auf einer gemeinsamen Achse 3 sind als hülsenförmige und mit einem elastischen Material versehene Andrückrollen 2 nebeneinanderliegend drehbar gelagert. Die gemeinsame Achse 3 dieser Andrückrollen 2 ist an ihren beiden Enden jeweils in hebelarmförmigen Aufnähmen einer sich über die Formatbreite des Formzylinders 1 erstreckenden Traverse 4 befestigt. Die Traverse 4 ist dabei ihrerseits in ihren beiden Enden in je einem Drehgelenk an den Seitengestellwänden 5 der Druckmaschine gelagert. Durch nicht dargestellte Stellmittel erfolgt das An- und Abstellen der Andrückrollen 2 an die Mantelfläche des Formzylinders 1.Fig. 2 shows a plate cylinder 1 of a sheet-fed offset printing press designed as a plate cylinder. On 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).

Durch Gewinde in der Traverse 4 sind zwei Spannschrauben 6 hindurchgedreht, deren Enden sich jeweils auf der Achse 3 abstützen, wobei hier die benachbarten Andrückrollen 2 einen entsprechenden Zwischenraum freigeben. In der dargestellten Situation gemäß Fig. 1 wurde die Achse 3 der Andrückrollen 2 durch die beiden Spannschrauben 6 derartig zum Formzylinder 1 hin vorgebogen (im nicht dargestellten abgestellten Zustand der Andrückrollen 2 gegenüber dem Formzylinder 1), so daß sich im angestellten Zustand der Andrückrollen 2 eine entsprechende Verbiegung der Traverse vom Formzylinder 1 weg ergibt.Two clamping screws 6 are screwed through the thread in the crossmember 4, the ends of which are each supported on the axis 3, with the adjacent pressure rollers 2 clearing a corresponding space here. In the situation shown in FIG. 1, the axis 3 of the pressure rollers 2 was pre-bent to the forme cylinder 1 by the two tensioning screws 6 (in the parked state of the pressure rollers 2 relative to the forme cylinder 1, not shown), so that the Pressure rollers 2 result in a corresponding bending of the crossbar away from the forme cylinder 1.

Oberhalb der Andrückrollen 2 ist der Liniendruck 7 gegenüber dem Formzylinder 1 angedeutet, wobei hier durch die Spannschrauben 6 und die dadurch hervorgerufene Verbiegung der Achse 3 sich über die Formatbreite des Formzylinders 1 ein konvexer Verlauf ergibt. Dadurch werden die in der Formatmitte des Formzylinders 1 liegenden Andrückrollen 2 stärker an dessen Umfang gedrückt als die an den Formaträndern liegenden Andrückelemente. Die einzelnen Andrückrollen 2 werden somit an der Berührlinie zum Formzylinder 1 hin mit unterschiedlichen Kräften angestellt, so daß sich entsprechend auch unterschiedliche Eindrückungen in dem elastischen Außenmaterial ergeben. Durch diese unterschiedlichen Abwicklungsverhältnisse ergeben sich in Achsrichtung des Formzylinders 1 nach außen wirkende Streckkräfte, so daß die oberhalb des Formzylinders 1 in der Fig. 1 dargestellte Druckplatte 8 an ihrem Druckende DE gestreckt wird. Der Druckanfang der Druckplatte 8 ist dabei mit DA gekennzeichnet. Die Druckende-Kante der Druckplatte 8 weist durch die derartig aufgeprägte Breitstreckwirkung ferner noch einen kovexen Verlauf auf. Gestrichelt ist in Fig. 1 die ursprüngliche rechteckige Form der Druckplatte 8.Above the pressure rollers 2, 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. As a result, 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.

In der Darstellung gemäß Fig. 2 ist angedeutet, daß hier über die Spannschrauben 6 der Achse 3 der Andrückrollen 2 nahezu keine Vorspannung aufgeprägt wurde. Dadurch gibt sich durch Anstellen der Andrückrollen 2 und der Verbiegung der Achse 3 durch die an beiden Formataußenbereichen einwirkenden und hier nicht dargestellten Krafteinleitungen (Pneumatikzylinder) zum Anstellen der Andrückrollen 2, daß der Liniendruck 7 über die Formatbreite des Formzylinders 1 einen konkaven Verlauf aufweist. Die Andruckkräfte die an den Formatgrenzen liegenden Andrückrollen ist somit größer als in den Bereichen der Formatmitte. Ein derartiger konkaver Verlauf des Liniendruckes 7 führt in Verbindung mit dem bereits erwähnten elastischen Verformen des Materials der Andrückrollen 2 in Verbindung mit der dadurch hervorgerufenen unterschiedlichen Abwicklung zu Kräften, welche die Druckplatte 8 zum Druckende DE hin zusammenzustauchen versuchen. Gemäß Fig. 2 weist eine derartig aufgezogene Druckplatte 8 eine Druckendekante auf, die kürzer ist als die Kante am Druckanfang DA. Durch die Verformungskräfte wird die Druckendekante der Druckplatte 8 ferner noch zu einem konkaven Verlauf hin geformt.In the illustration according to FIG. 2 it is indicated that almost no pre-tension has been impressed on the tensioning screws 6 of the axis 3 of the pressure rollers 2. As a result, by pressing the pressure rollers 2 and bending the axis 3 due to the force introductions (pneumatic cylinders) acting on the two format outer areas and not shown here, for pressing the pressure rollers 2, the line pressure 7 has a concave course over the format width of the form cylinder 1. The pressure forces on the pressure rollers lying at the format limits are thus greater than in the areas of the format center. Such a concave course of the line pressure 7, in conjunction with the already mentioned elastic deformation of the material of the pressure rollers 2 in conjunction with the resulting different development, leads to forces which attempt to compress the pressure plate 8 towards the end of printing DE. According to FIG. 2, 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.

In der Darstellung gemäß Fig. 3 wurde durch die Spannschrauben 6 die Achse 3 derartig gegenüber der Traverse 4 verspannt, so daß sich durch die Anstellkraft der Andrückrollen 2 die durch diese Kräfte verursachte Durchbiegung der Achse 3 gerade kompensiert. Es ergibt sich ein gleichmäßiger Verlauf des Liniendruckes 7 über die Formatbreite des Formzylinders 1. Die einzelnen Andrückrollen 2 erfahren aim Kontaktbereich zum Formzylinder 1 eine gleichmäßige Einrückung, so daß über deren Breite ebenfalls eine gleichbleibende Abwicklung herrscht. Durch die Eindrückung im elastischen Außenmaterial der Andrückrollen 2 entstehen somit lediglich Zugkräfte in Umfangsrichtung des Formzylinders 1.In the illustration according to FIG. 3, 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. This results in a uniform progression of the line print 7 over the format width of the forme cylinder 1. The individual pressure rollers 2 experience a uniform indentation in 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.

BezugszeichenlisteReference list

11
FormzylinderForme cylinder
22nd
AndrückrollePressure roller
33rd
Achseaxis
44th
Traversetraverse
55
SeitengestellwandSide frame wall
66
SpannschraubeClamping screw
77
LiniendruckLine printing
88th
Druckplatteprinting plate
DATHERE
DruckanfangStart of printing
DEDE
DruckendeEnd of printing

Claims (5)

Verfahren zum Aufziehen flexibler Druckformen auf den Formzylinder einer Bogendruckmaschine, insbesondere zum Aufziehen von Druckplatten auf dem Plattenzylinder einer Offsetdruckmaschine, bei welchem über die Formatbreite des Formzylinders sich erstreckende und mit einem elastisch verformbaren Außenmantel versehene Andrückrollen an diesen angestellt werden,
dadurch gekennzeichnet,
daß die Andrückkraft, mit der die Andrückrollen (2) an den Formzylinder (1) angestellt werden, über dessen Formatbreite unterschiedlich ist.Method for mounting flexible printing forms on the forme cylinder of a sheet-fed printing machine, in particular for mounting printing plates on the plate cylinder of an offset printing machine, in which pressure rollers which extend over the format width of the form cylinder and are provided with an elastically deformable outer jacket are placed thereon,
characterized by
that the pressure with which the pressure rollers (2) are applied to the forme cylinder (1) is different across its format width. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die der Formatmitte des Formzylinders (1) zugeordneten Andrückrollen (2) stärker als die den Formaträndern des Formzylinders (1) zugeordneten Andrückrollen (2) an diesen angestellt werden, so daß sich ein Liniendruck (7) mit konvexem Verlauf ergibt.Method according to claim 1,
characterized by
that the pressure rollers (2) assigned to the format center of the forme cylinder (1) are positioned more strongly than the pressure rollers (2) assigned to the format edges of the forme cylinder (1), so that there is a line pressure (7) with a convex course. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die den Formaträndern des Formzylinders (1) zugeordneten Andrückrollen (2) stärker an diesen angestellt werden als die Andrückrollen (2) in der Formatmitte des Formzylinders (1), so daß sich ein konkaver Verlauf des Liniendruckes (7) ergibt.Method according to claim 1,
characterized by
that the pressure rollers (2) assigned to the format edges of the forme cylinder (1) are positioned more strongly on the latter than the pressure rollers (2) in the middle of the format of the forme cylinder (1), so that there is a concave course of the line pressure (7). Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, mit Andrückrollen (2), welche auf einer gemeinsamen Achse (3) drehbar gelagert und bezüglich dem Außenumfang des Formzylinders (1) an- und abstellbar gegenüber diesem gelagert sind,
dadurch gekennzeichnet,
daß parallel zu der Achse (3) der Andrückrollen (2) eine Traverse (4) vorgesehen ist, und zwischen dieser und der Achse (3) wenigstens eine Spanneinrichtung vorgesehen ist, durch welche die Achse (3) verbiegbar ist.Device for carrying out the method according to claim 1, with pressure rollers (2) which are rotatably mounted on a common axis (3) and are mounted on and off relative to the outer circumference of the forme cylinder (1),
characterized by
that a crossbar (4) is provided parallel to the axis (3) of the pressure rollers (2), and between this and the axis (3) at least one tensioning device is provided, through which the axis (3) can be bent. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
daß die Spanneinrichtung als eine Spannschraube (6) ausgebildet ist, die durch ein Gewinde in der Traverse (4) hindurchgedreht und sich mit ihrem freien Ende an der Achse (3) abstützt.Device according to claim 4,
characterized by
that the clamping device is designed as a clamping screw (6) which rotates through a thread in the crossmember (4) and is supported with its free end on the axis (3).
EP96102801A 1995-03-25 1996-02-24 Method and apparatus for mounting flexible printing plates Expired - Lifetime EP0734861B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19511075 1995-03-25
DE19511075A DE19511075A1 (en) 1995-03-25 1995-03-25 Method and device for mounting flexible printing forms

Publications (2)

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

Family

ID=7757789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102801A Expired - Lifetime EP0734861B1 (en) 1995-03-25 1996-02-24 Method and apparatus for mounting flexible printing plates

Country Status (3)

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

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CN101830105A (en) * 2009-03-13 2010-09-15 海德堡印刷机械股份公司 The method and apparatus that is used for feeding printing plates

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10001324B4 (en) * 2000-01-14 2011-02-24 Koenig & Bauer Aktiengesellschaft Device and method for mounting flexible printing forms
DE10001319B4 (en) * 2000-01-14 2011-02-24 Koenig & Bauer Aktiengesellschaft Device and method for mounting flexible printing plates on the plate cylinder of a printing machine
DE20316404U1 (en) * 2003-10-24 2003-12-24 Man Roland Druckmaschinen Ag Pressure roller for print cylinder has a number of small pressure rollers on a common axle spaced between pressure cylinders

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Publication number Priority date Publication date Assignee Title
DE4214207C1 (en) * 1992-04-30 1993-07-22 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
EP0573833A1 (en) * 1992-05-30 1993-12-15 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Apparatus for mounting printing plates in registered positions
DE4420971C1 (en) * 1994-06-16 1995-07-20 Roland Man Druckmasch Pulling method for flexible printing block onto press cylinder
DE4424903A1 (en) * 1994-01-17 1995-07-20 Koenig & Bauer Ag Device for assembling, disassembling and transporting easily bendable, curved objects with bent edges

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DE4215969C2 (en) * 1992-05-18 1994-10-13 Roland Man Druckmasch Device for feeding printing plates onto the plate cylinders of printing machines, in particular sheet-fed offset printing machines
DE4231906C2 (en) * 1992-09-18 1995-10-12 Koenig & Bauer Ag Device for feeding and discharging printing plates to and from a plate cylinder
DE4321751C1 (en) * 1993-06-30 1994-11-24 Roland Man Druckmasch Device for precise clamping of printing plates on the plate cylinder of printing machines

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214207C1 (en) * 1992-04-30 1993-07-22 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
EP0573833A1 (en) * 1992-05-30 1993-12-15 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Apparatus for mounting printing plates in registered positions
DE4424903A1 (en) * 1994-01-17 1995-07-20 Koenig & Bauer Ag Device for assembling, disassembling and transporting easily bendable, curved objects with bent edges
DE4420971C1 (en) * 1994-06-16 1995-07-20 Roland Man Druckmasch Pulling method for flexible printing block onto press cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101830105A (en) * 2009-03-13 2010-09-15 海德堡印刷机械股份公司 The method and apparatus that is used for feeding printing plates
US8590451B2 (en) 2009-03-13 2013-11-26 Heidelberger Druckmaschinen Ag Method and apparatus for feeding printing plates
CN101830105B (en) * 2009-03-13 2014-04-09 海德堡印刷机械股份公司 Method and apparatus for feeding printing plates

Also Published As

Publication number Publication date
DE19511075A1 (en) 1996-09-26
DE59600032D1 (en) 1997-11-20
ATE159202T1 (en) 1997-11-15
EP0734861B1 (en) 1997-10-15

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