EP0060492A1 - Rubber blanket tensioning device for offset printing machines - Google Patents

Rubber blanket tensioning device for offset printing machines Download PDF

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Publication number
EP0060492A1
EP0060492A1 EP19820101845 EP82101845A EP0060492A1 EP 0060492 A1 EP0060492 A1 EP 0060492A1 EP 19820101845 EP19820101845 EP 19820101845 EP 82101845 A EP82101845 A EP 82101845A EP 0060492 A1 EP0060492 A1 EP 0060492A1
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EP
European Patent Office
Prior art keywords
pit
tensioning
blanket
rubber blanket
clamping
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.)
Withdrawn
Application number
EP19820101845
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German (de)
French (fr)
Inventor
Werner Ahl
Gerd Hoffmann
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.)
Albert Frankenthal AG
Original Assignee
Albert Frankenthal AG
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Filing date
Publication date
Application filed by Albert Frankenthal AG filed Critical Albert Frankenthal AG
Publication of EP0060492A1 publication Critical patent/EP0060492A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L38/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41L38/02—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to impression cylinders
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders

Definitions

  • the invention relates to a blanket tensioning device for offset printing machines, in particular web-fed rotary offset printing machines, in which at the ends of the blanket entering a cylinder pit, a cross-sectionally approximately rectangular tensioning strip, which extends over the pit length and engages through the pit side by evenly distributed over the pit length held clamping screws are adjustable in the clamping direction.
  • the two clamping bars are adjustable by means of independently operable clamping screws and are each received in an assigned, approximately rectangular cross-section groove of the cylinder pit, which is extended towards the pit floor and in the area of the pit dome a middle, after radially outside tapering, the webs assigned to the two grooves separating grooves from each other, the nut-side walls form support surfaces for the tension bars accommodated in the respectively limited grooves, which are penetrated by the associated tensioning screws parallel to the web-side support surfaces and whose small nere width plus a small amount of assembly play corresponds to the width of the pit opening.
  • the upper edge of the web separating the two grooves forms a reference edge, on the basis of which it is easily visible or ascertainable whether the tensioning strips inserted into the grooves are parallel to the reference edges, ie. H. aligned parallel to the axis or inclined against the axis, which enables an exact tension of both rubber blankets that can be individually adapted to the circumstances of the individual case.
  • a tilt-free guidance of the tensioning strips in the respectively assigned groove is advantageously possible.
  • each clamping bar is assigned a groove and these two grooves are practically V-shaped against each other, the use of stable, high clamping bars results in a comparatively small radial pit depth, which can be particularly advantageous for small cylinder diameters. At the same time, however, a comparatively narrow opening cross section is also achieved. Another advantage can be seen in the fact that the cylinder pit can be produced simply by two milling or saw cuts. The advantages that can be achieved with the invention can therefore be seen in particular in a high degree of variability and accuracy.
  • tensioning strips are each attached directly to the associated rubber blanket end, since one of these arrangement with a particularly shallow pit depth.
  • these measures enable a particularly stable riveting of the rails provided in the area of each end of the rubber blanket, one of which is designed as a tensioning strip, since, due to its thickness, this forms a deflection-resistant counter bearing when the rivet connection is produced.
  • an offset printing machine e.g. B. a web-fed offset printing press
  • the printing ink is transferred to the printing material through a rubber blanket indicated at 1 in FIG.
  • the rubber blanket 1 is clamped onto an assigned cylinder 2, which is provided with a cylinder pit 3 in the area of its circumference, in which run in the ends 4 and 5 of the rubber blanket 1 and are held adjustable therein.
  • the ends 4 and 5 of the rubber blanket 1 running around the circumference of the cylinder 2 are provided with thickenings 6 directed towards the top of the rubber blanket 1, the inner edge of which forms a support step 7.
  • strips or rails riveted to the ends of the rubber blanket 1 can simply be provided.
  • the ends of the rubber blanket are expediently riveted between two strips or rails.
  • a tensioning strip 8 is assigned to each end 4 or 5 of the rubber blanket, which acts on the support step 7 of the thickening 6 in question and pulls the assigned end 4 or 5 of the rubber blanket 1 into the cylinder pit 3.
  • the tensioning strips 8 extend over the entire length of the cylinder pit 3 and can be actuated in the tensioning direction by means of tensioning screws 9 distributed uniformly over their length, each of which engages in an assigned thread in the area of the pit floor, i.e. pulled towards the pit floor.
  • tensioning screws 9 distributed uniformly over their length, each of which engages in an assigned thread in the area of the pit floor, i.e. pulled towards the pit floor.
  • both ends 4 and 5 of the rubber blanket 1 can be precisely adjusted or adjusted with regard to their tension, separately and independently of one another.
  • the clamping strips 8 run parallel to the lateral pit walls 10.
  • the clamping screws 9 are arranged approximately in the area of the central longitudinal plane of the clamping strips 8.
  • the pit 3 is flared towards the bottom, so that the clamping strips 8, which are arranged separately next to one another, can be very solid and therefore designed to be pressure-resistant and yet easily accessible next to one another.
  • the clear cross-section of the cylinder pit 3 in the region of the pit opening 11 can advantageously be dimensioned such that the cross-section of the clamping strips 8 is approximately rectangular here are just about to be installed or removed in the radial direction with the rubber blanket on.
  • the smaller width of the cross-sections, which are essentially rectangular in cross-section, corresponds approximately to the inside width of the pit opening 11 minus a slight assembly play.
  • the pit 3 is provided on the bottom side with two grooves 13 which are separated from one another by a central web 12 and are rectangular in cross section and bear against the pit side walls 10, in each of which a clamping bar 8 is received.
  • the clamping strips 8 can rest with their rear side facing away from the pit side wall 10 against the flank of the central web 12 parallel to the side wall, so that there is reliable support and clean guidance.
  • the pit 3 widening at the bottom and having the grooves 13 can simply be produced by two milling or saw cuts or the like which are inclined to a radial plane which contains the pit central longitudinal plane and overlap in the area of the pit opening 11.
  • the middle web 12 between the pits 13 results automatically.
  • the top tip of the web 12 is removed.
  • the upper edge or edges of the web 12 enable easy alignment control of the clamping strips 8.
  • the clamping strips 8 are each provided on the thickening side with a recess formed by a groove which is open on one side, which results in a counter stage 14 assigned to the thickening gssei-bearing stage 7. Below this step engagement, the tensioning strips 8 can rest against the respectively assigned thickening 6 along a surface 15 that is recessed with respect to their outer contour, which means that the tensioning strips are guided with no jamming 8 and the rubber blanket-side thickening 6, thus ensuring high functional reliability.
  • the width of the grooves 13 is expediently dimensioned such that it corresponds to the overall width of a thickening 6 and the clamping bar 8 engaged therewith in the region below the engagement step 14 or support step 7.
  • the tensioning strips 8 have so much free space in the grooves 13 on the bottom side that a stretch of the rubber blanket that results in practice can be readily accommodated.
  • the tensioning strips are fastened directly to the respectively associated end of the rubber blanket 1.
  • the ends of the rubber blanket 1 are gripped between two rails, of which the rail pointing toward the rubber blanket top is designed as a tensioning strip 8.
  • the rail pointing towards the rear can be designed as a thin sheet 16, which is stabilized by the high dimensional accuracy of the associated clamping bar 8.
  • the tensioning strip 8, the associated sheet 16 and the associated end of the rubber blanket 1 are connected to one another by rivets 17, which are expediently located in the area between the holes 18 provided for receiving the tensioning screws.
  • the formation of the rail opposite the sheet 16 as a clamping bar 8, d. H. the direct connection of the tensioning strip 8 with the rubber blanket 1 allows the use of comparatively high and thus stable tensioning strips, which ensure a high degree of bending security, even with a relatively small groove or pit depth.
  • the basic pit shape and screw arrangement of the arrangement according to FIG. 1 also applies to the embodiment according to FIG. 2.
  • To accomplish a tilt-free Guide of the tensioning strips in the respectively assigned pit groove corresponds to the clear pit width of the combined width of tensioning strip 8, rubber blanket 1 and assigned sheet metal 16 plus a slight displacement play.
  • the tensioning strip 8 and the sheet 16 forming the counter rail are guided cant-proof on the flanks of the respectively assigned pit groove.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

In the rubber blanket tensioning device, in which thickenings (6) are provided at the ends (4 and 5) of the rubber blanket entering a cylinder groove (3), which thickenings each form a resting step (7) directed towards the upper side of the rubber blanket (1) and to which tension can be applied in the tensioning direction by means of a tensioning strip (8) which can be brought into engagement with said resting step and is actuable by tensioning screws (9), a high degree of functional reliability and tensionability of the two ends (4 and 5) of the rubber blanket (1), independently of each other, is achieved and a simple structure and comparatively simple servicing and cleaning are guaranteed by the fact that two parallel tensioning strips (8) are provided which are separate from each other, interact in each case with an associated thickening (6) of the rubber blanket (1) and are actuable independently of one another by tensioning screws (9) which are assigned to each one. <IMAGE>

Description

Die Erfindung betrifft eine Gummituchspannvorrichtung für Offset-Druckmaschinen, insbesondere Rollenrotations-Offsetdruckmaschinen, bei der an den in eine Zylindergrube einlaufenden Enden des Gummituchs jeweils eine über die Grubenlänge sich erstreckende, im Querschnitt etwa rechteckige Spannleiste angreift, die durch gleichmäßig über die Grubenlänge verteilte, grubenseitig gehaltene Spannschrauben in Spannrichtung verstellbar sind.The invention relates to a blanket tensioning device for offset printing machines, in particular web-fed rotary offset printing machines, in which at the ends of the blanket entering a cylinder pit, a cross-sectionally approximately rectangular tensioning strip, which extends over the pit length and engages through the pit side by evenly distributed over the pit length held clamping screws are adjustable in the clamping direction.

Eine Anordnung dieser Art ist aus der GB-PS 925 330 bekannt. Bei dieser bekannten Anordnung sind die Spannleisten in der Spannstellung in einer rechteckigen Zylindergrube übereinander angeordnet. Hierbei ergeben sich demnach nicht nur eine große Grubenöffnung und insbesondere eine große Grubentiefe, sondern auch infolge der unterschiedlichen Länge der in die Zylindergrube einlaufenden Enden des Gummituchs asymmetrische Zugverhältnisse. Die übereinander sich befindenden Spannleisten sind hierbei in Umfangsrichtung gegeneinander versetzt. Die lichte Grubenweite ist daher größer als die Breite der einzelnen Spannleiste, so daß die Gefahr von Verkantungen besteht. Dies wäre nur durch Verwendung von Paßschrauben zu verhindern, was sich jedoch negativ auf die Herstellungskosten auswirken würde. Bei der bekannten Anordnung sind zwar jeder Spannleiste Spannschrauben zugeordnet. Zur Bewerkstelligung des eigentlichen Spannvorgangs dienen jedoch lediglich die der in der Spannstellung oberen Spannleiste zugeordneten Spannschrauben. Die untere Spannleiste wird dabei von der oberen, hierauf aufsitzenden Spannleiste mitgenommen. Die der unteren Spannleiste zugeordneten Schrauben, deren Köpfe bei der Durchführung eines Spannvorgangs von ihrem Sitz abheben, dienen hierbei lediglich zur Sicherung der unteren Spannleiste während des Einlegvorgangs.An arrangement of this type is known from GB-PS 925 330. In this known arrangement, the clamping bars are arranged one above the other in the clamping position in a rectangular cylinder pit. This results not only in a large pit opening and in particular a large pit depth, but also asymmetrical draft ratios as a result of the different length of the ends of the rubber blanket entering the cylinder pit. The clamping strips located one above the other are offset from one another in the circumferential direction. The clear pit width is therefore larger than the width of the individual clamping bar, so that there is a risk of jamming. This could only be prevented by using fitting screws, which would have a negative impact on the manufacturing costs. In the known arrangement, each clamping bar is assigned clamping screws. However, only the clamping screws assigned to the upper clamping bar in the clamping position are used to accomplish the actual clamping process. The lower tensioning bar is carried along by the upper tensioning bar resting on it. The screws assigned to the lower tensioning bar, the heads of which lift off their seats when a tensioning operation is being carried out, serve only to secure the lower tensioning bar during the insertion process.

Nachteilig hierbei ist, daß mit Hilfe der gemeinsamen Spannleiste beide Enden des Gummituchs ausschließlich gleichmäßig und gleichzeitig gespannt werden können. Die Erfahrung hat jedoch gezeigt, daß sich im Laufe des Betriebs das in Drehrichtung hintere Ende des Gummituchs verhältnismäßig stark lockern kann. Der Grund dafür besteht in der durch die sog. Walkung sich ergebenden Dehnung des Gummituchs, die praktisch nicht zu vermeiden ist und eine Nachstellung im Bereich der Spannvorrichtung erfordert. Bei der bekannten Anordnung wird jedoch beim Nachspannen nicht nur das gelockerte in Drehrichtung hintere Ende des Gummituchs gespannt, sondern auch das gegenüberliegende, in Drehrichtung vordere Ende, das durch die Walkung nicht entlastet ist. Dies kann daher vielfach zu einer sehr ungleichmäßigen Dehnung und damit zu einer sehr ungleichmäßigen Dickenabnahme und vielfach zu einer Überdehnung des Gummituchs führen.The disadvantage here is that both ends of the rubber blanket can only be tensioned uniformly and simultaneously using the common tensioning strip. Experience has shown, however, that the rear end of the rubber blanket can loosen relatively strongly during operation. The reason for this is the deh resulting from the so-called flexing the blanket, which is practically unavoidable and requires readjustment in the area of the tensioning device. In the known arrangement, however, not only is the loosened end of the rubber blanket stretched in the direction of rotation, but also the opposite end in the direction of rotation, which is not relieved by the flexing. This can therefore often lead to very uneven stretching and thus to a very uneven decrease in thickness and in many cases to overextension of the rubber blanket.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung unter Vermeidung der Nachteile der bekannten Anordnungen eine Gummituchspannvorrichtung eingangs erwähnter Art zu schaffen, bei der die beiden Enden des Gummituchs nicht nur unabhängig voneinander, sondern auch mit hoher Exaktheit über ihrer ganzen Breite gespannt werden können und die dennoch einfach aufgebaut und herstellbar ist.Proceeding from this, it is therefore the object of the present invention, while avoiding the disadvantages of the known arrangements, to provide a blanket tensioning device of the type mentioned in the introduction, in which the two ends of the blanket can not only be stretched independently of one another, but also with great accuracy over their entire width, and which is still simple to build and manufacture.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die beiden Spannleisten mittels jeweils unabhängig voneinander betätigbarer Spannschrauben verstellbar sind und in jeweils einer zugeordneten, im Querschnitt etwa rechteckigen Nut der Zylindergrube aufgenommen sind, die zum Grubenboden hin erweitert ist und im Bereich des Grubendodens einen mittleren, nach radial außen sich verjüngenden, die den beiden Spannleisten zugeordneten Nuten voneinander trennenden Steg aufweist, dessen nutseitige Wandungen Auflageflächen für die in den hiervon jeweils begrenzten Nuten aufgenommenen Spannleisten bilden, die parallel zu den stegseitigen Auflageflächen von den zugeordneten Spannschrauben durchsetzt sind und deren kleinere Breite zuzüglich eines geringen Montagespiels der Breite der Grubenöffnung entspricht.This object is achieved in that the two clamping bars are adjustable by means of independently operable clamping screws and are each received in an assigned, approximately rectangular cross-section groove of the cylinder pit, which is extended towards the pit floor and in the area of the pit dome a middle, after radially outside tapering, the webs assigned to the two grooves separating grooves from each other, the nut-side walls form support surfaces for the tension bars accommodated in the respectively limited grooves, which are penetrated by the associated tensioning screws parallel to the web-side support surfaces and whose small nere width plus a small amount of assembly play corresponds to the width of the pit opening.

Diese Maßnahmen gewährleisten nicht nur symmetrische Zugverhältnisse sowie eine separate Verstellbarkeit beider Spannleisten, sondern ermöglichen auch eine ausgezeichnete Sichtkontrolle beider Spannleisten. Die Oberkante des die beiden Nuten voneinander trennenden Stegs bildet dabei eine Bezugskante, anhand welcher leicht sichtbar bzw. feststellbar ist, ob die in die Nuten eingelegten Spannleisten bezugskantenparallel, d. h. achsparallel ausgerichtet oder gegen die Achse geneigt sind, was eine exakte, den Verhältnissen des Einzelfalls individuell anpaßbare Spannung beider Gummituchenden ermöglicht. Gleichzeitig ist hierbei in vorteilhafter Weise eine verkantungsfreie Führung der Spannleisten in der jeweils zugeordneten Nut möglich. Da jeder Spannleiste eine Nut zugeordnet ist und diese beiden Nuten praktisch V-formig gegeneinander angestellt sind, ergibt sich auch bei Verwendung stabiler, hoher Spannleisten eine vergleichsweise geringe radiale Grubentiefe, was sich besonders bei kleinen Zylinderdurchmessern vorteilhaft auswirken kann. Gleichzeitig wird aber auch ein vergleichsweise schmaler Öffnungsquerschnitt erreicht. Ein weiterer Vorteil ist darin zu sehen, daß die Zylindergrube einfach durch zwei Fräs- bzw. Sägenschnitte herstellbar ist. Die mit der Erfindung erzielbaren Vorteile sind demnach insbesondere in einer hohen Variabilität und Exaktheit zu sehen.These measures not only ensure symmetrical draft conditions and a separate adjustability of both clamping bars, but also enable excellent visual inspection of both clamping bars. The upper edge of the web separating the two grooves forms a reference edge, on the basis of which it is easily visible or ascertainable whether the tensioning strips inserted into the grooves are parallel to the reference edges, ie. H. aligned parallel to the axis or inclined against the axis, which enables an exact tension of both rubber blankets that can be individually adapted to the circumstances of the individual case. At the same time, a tilt-free guidance of the tensioning strips in the respectively assigned groove is advantageously possible. Since each clamping bar is assigned a groove and these two grooves are practically V-shaped against each other, the use of stable, high clamping bars results in a comparatively small radial pit depth, which can be particularly advantageous for small cylinder diameters. At the same time, however, a comparatively narrow opening cross section is also achieved. Another advantage can be seen in the fact that the cylinder pit can be produced simply by two milling or saw cuts. The advantages that can be achieved with the invention can therefore be seen in particular in a high degree of variability and accuracy.

Für besonders kleine Zylinderdurchmesser kann es zweckmäßig sein, wenn die Spannleisten jeweils direkt am zugeordneten Gummituchende befestigt sind, da eine derartige Anordnung mit einer besonders geringen Grubentiefe auskommt. Außerdem ergibt sich hierbei ein besonders geringer Teilebedarf. Außerdem ermöglichen diese Maßnahmen eine besonders stabile Vernietung der im Bereich jedes Endes des Gummituchs vorgesehenen Schienen, von denen eine als Spannleiste ausgebildet ist, da diese aufgrund ihrer Dicke bei der Herstellung der Nietverbindung ein verbiegungssteifes Gegenlager bildet.For particularly small cylinder diameters, it can be expedient if the tensioning strips are each attached directly to the associated rubber blanket end, since one of these arrangement with a particularly shallow pit depth. In addition, there is a particularly low need for parts. In addition, these measures enable a particularly stable riveting of the rails provided in the area of each end of the rubber blanket, one of which is designed as a tensioning strip, since, due to its thickness, this forms a deflection-resistant counter bearing when the rivet connection is produced.

Weitere zweckmäßige Ausgestaltungen und vorteilhafte Weiterbildungen der übergeordneten Maßnahmen ergeben sich aus der nachstehenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung in Verbindung mit den restlichen Unteransprüchen.Further expedient refinements and advantageous developments of the superordinate measures result from the following description of an exemplary embodiment with reference to the drawing in conjunction with the remaining subclaims.

In der Zeichnung zeigen:

  • Figur 1 ein Ausführungsbeispiel mit zwei separaten Spannleisten anhand eines Radialschnitts durch einen Gummizylinder einer Rollenrotations-Offsetdruckmaschine und
  • Figur 2 ein Beispiel für eine direkte Befestigung der Spannleisten am jeweils zugeordneten Gummituchende.
The drawing shows:
  • Figure 1 shows an embodiment with two separate clamping bars based on a radial section through a rubber cylinder of a web-fed offset printing press and
  • Figure 2 shows an example of a direct attachment of the tensioning strips to the respectively associated blanket end.

Der Aufbau einer Offsetdruckmaschine, z. B. einer Rollenrotations-Offsetdruckmaschine ist an sich bekannt und bedarf daher im vorliegenden Zusammenhang keiner näheren Erläuterung. Bei Offset-Druckmaschinen wird die Druckfarbe durch ein in Figur 1 bei 1 angedeutetes Gummituch an den Bedruckstoff übertragen. Das Gummituch 1 ist auf einen zugeordneten Zylinder 2 aufgespannt, der im Bereich seines Umfangs mit einer Zylindergrube 3 versehen ist, in welche die Enden 4 und 5 des Gummituchs 1 einlaufen und hierin verstellbar gehalten sind.The construction of an offset printing machine, e.g. B. a web-fed offset printing press is known per se and therefore requires no further explanation in the present context. In offset printing machines, the printing ink is transferred to the printing material through a rubber blanket indicated at 1 in FIG. The rubber blanket 1 is clamped onto an assigned cylinder 2, which is provided with a cylinder pit 3 in the area of its circumference, in which run in the ends 4 and 5 of the rubber blanket 1 and are held adjustable therein.

Bei dem in Figur 1 dargestellten Ausführungsbeispiel sind die Enden 4 bzw. 5 des auf dem Umfang des Zylinders 2 umlaufenden Gummituchs 1 mit zur Oberseite des Gummituchs 1 hin gerichteten Verdickungen 6 versehen, deren innere Kante eine Auflagestufe 7 bildet. Zur Bildung der Verdickungen 6 können einfach auf die Enden des Gummituchs 1 aufgenietete Leisten bzw. Schienen vorgesehen sein. Zweckmäßig sind die Enden des Gummituchs dabei zwischen jeweils zwei Leisten bzw. Schienen eingenietet. Jedem Ende 4 bzw. 5 des Gummituchs ist eine Spannleiste 8 zugeordnet, die an der Auflagestufe 7 der betreffenden Verdickung 6 angreift und das zugeordnete Ende 4 bzw. 5 des Gummituchs 1 in die Zylindergrube 3 hineinzieht. Die Spannleisten 8 erstrecken sich über die gesamte Länge der Zylindergrube 3 und können durch gleichmäßig über ihre Länge verteilte Spannschrauben 9, die jeweils in ein zugeordnetes Gewinde im Bereich des Grubenbodens eingreifen, in Spannrichtung betätigt werden, d.h. zum Grubenboden hin gezogen werden. Hierdurch sind beide Enden 4 bzw. 5 des Gummituchs 1 hinsichtlich ihrer Spannung genau ein- bzw. nachstellbar, und zwar separat und unabhängig voneinander. Die Spannleisten 8 verlaufen parallel zu den seitlichen Grubenwandungen 10. Die Spannschrauben 9 sind etwa im Bereich der Mittellängsebene der Spannleisten 8 angeordnet.In the exemplary embodiment shown in FIG. 1, the ends 4 and 5 of the rubber blanket 1 running around the circumference of the cylinder 2 are provided with thickenings 6 directed towards the top of the rubber blanket 1, the inner edge of which forms a support step 7. To form the thickenings 6, strips or rails riveted to the ends of the rubber blanket 1 can simply be provided. The ends of the rubber blanket are expediently riveted between two strips or rails. A tensioning strip 8 is assigned to each end 4 or 5 of the rubber blanket, which acts on the support step 7 of the thickening 6 in question and pulls the assigned end 4 or 5 of the rubber blanket 1 into the cylinder pit 3. The tensioning strips 8 extend over the entire length of the cylinder pit 3 and can be actuated in the tensioning direction by means of tensioning screws 9 distributed uniformly over their length, each of which engages in an assigned thread in the area of the pit floor, i.e. pulled towards the pit floor. As a result, both ends 4 and 5 of the rubber blanket 1 can be precisely adjusted or adjusted with regard to their tension, separately and independently of one another. The clamping strips 8 run parallel to the lateral pit walls 10. The clamping screws 9 are arranged approximately in the area of the central longitudinal plane of the clamping strips 8.

Die Grube 3 ist zum Boden hin konisch erweitert, so daß die separat nebeneinander angeordneten Spannleisten 8 sehr massiv und daher drucksteif ausgebildet und dennoch gut zugänglich nebeneinander angeordnet sein können. Der lichte Querschnitt der Zylindergrube 3 im Bereich der Grubenöffnung 11 kann dabei vorteilhaft so bemessen sein, daß die im Querschnitt etwa rechteckförmigen Spannleisten 8 hierüber bei aufgelegtem Gummituch in radialer Richtung gerade noch ein- bzw. ausbaubar sind. Die kleinere Breite der im Querschnitt im wesentlichen rechteckförmigen Spannleisten entspricht dabei etwa der lichten Weite der Grubenöffnung 11 abzüglich eines geringen Montagespiels. Die Grube 3 ist bodenseitig mit zwei durch einen mittleren Steg 12 voneinander getrennten, im Querschnitt rechteckförmigen, an die Grubenseitenwandungen 10 sich anlegenden Nuten 13 versehen, in denen jeweils eine Spannleiste 8 aufgenommen wird. Die Spannleisten 8 können sich dabei mit ihrer von der Grubenseitenwandung 10 jeweils abgewandten Rückseite an die seitenwandparallele Flanke des mittleren Stegs 12 anlegen, so daß sich eine zuverlässige Abstützung und saubere Führung ergibt. Die bodenseitig sich erweiternde, die Nuten 13 aufweisende Grube 3 kann einfach durch zwei zu einer die Grubenmittellängsebene enthaltenden Radialebene geneigte, im Bereich der Grubenöffnung 11 sich überschneidende Fräs- bzw. Sägeschnitte oder dergleichen hergestellt werden. Der mittlere Steg 12 zwischen den Gruben 13 ergibt sich dabei automatisch. Im dargestellten Ausführungsbeispiel ist die obere Spitze des Stegs 12 abgenommen. Die Oberkante bzw. -kanten des Stegs 12 ermöglichen eine einfache Fluchtungskontrolle der Spannleisten 8.The pit 3 is flared towards the bottom, so that the clamping strips 8, which are arranged separately next to one another, can be very solid and therefore designed to be pressure-resistant and yet easily accessible next to one another. The clear cross-section of the cylinder pit 3 in the region of the pit opening 11 can advantageously be dimensioned such that the cross-section of the clamping strips 8 is approximately rectangular here are just about to be installed or removed in the radial direction with the rubber blanket on. The smaller width of the cross-sections, which are essentially rectangular in cross-section, corresponds approximately to the inside width of the pit opening 11 minus a slight assembly play. The pit 3 is provided on the bottom side with two grooves 13 which are separated from one another by a central web 12 and are rectangular in cross section and bear against the pit side walls 10, in each of which a clamping bar 8 is received. The clamping strips 8 can rest with their rear side facing away from the pit side wall 10 against the flank of the central web 12 parallel to the side wall, so that there is reliable support and clean guidance. The pit 3 widening at the bottom and having the grooves 13 can simply be produced by two milling or saw cuts or the like which are inclined to a radial plane which contains the pit central longitudinal plane and overlap in the area of the pit opening 11. The middle web 12 between the pits 13 results automatically. In the illustrated embodiment, the top tip of the web 12 is removed. The upper edge or edges of the web 12 enable easy alignment control of the clamping strips 8.

Bei dem der Figur 1 zugrunde liegenden Ausführungsbeispiel sind die Spannleisten 8 jeweils verdick ungsseitig mit einer durch eine einseitig offene Nut gebildeten Ausnehmung versehen, welche eine der verdickun gssei tigen Auflagestufe 7 jeweils zugeordnete Gegenstufe 14 ergibt. Unterhalb dieses Stufeneingriffs können die Spannleisten 8 entlang einer gegenüber ihrer Außenkontur zurückgenommenen Fläche 15 an der jeweils zugeordneten Verdickung 6 anliegen, was eine verkantungssichere Führung der Spannleisten 8 und der gummituchseitigen Verdickungen 6 gewährleistet und damit eine hohe Funktionssicherheit ergibt. Die Breite der Nuten 13 ist dabei zweckmäßig so bemessen, daß sie der Gesamtbreite jeweils einer Verdickung 6 und der hiermit im Eingriff befindenen Spannleiste 8 im Bereich unterhalb der Eingriffsstufe 14 bzw. Auflagestufe 7 entspricht. Die Spannleisten 8 haben in den Nuten 13 bodenseitig so viel Freiraum, daß eine in der Praxis sich ergebende Dehnung des Gummituchs ohne weiteres aufnehmbar ist.In the embodiment on which FIG. 1 is based, the clamping strips 8 are each provided on the thickening side with a recess formed by a groove which is open on one side, which results in a counter stage 14 assigned to the thickening gssei-bearing stage 7. Below this step engagement, the tensioning strips 8 can rest against the respectively assigned thickening 6 along a surface 15 that is recessed with respect to their outer contour, which means that the tensioning strips are guided with no jamming 8 and the rubber blanket-side thickening 6, thus ensuring high functional reliability. The width of the grooves 13 is expediently dimensioned such that it corresponds to the overall width of a thickening 6 and the clamping bar 8 engaged therewith in the region below the engagement step 14 or support step 7. The tensioning strips 8 have so much free space in the grooves 13 on the bottom side that a stretch of the rubber blanket that results in practice can be readily accommodated.

Bei dem der Figur 2 zugrunde liegenden Ausführungsbeispiel sind die hierbei ebenfalls mit 8 bezeichneten Spannleisten direkt am jeweils zugeordneten Ende des Gummituchs 1 befestigt. Die Enden des Gummituchs 1 sind dabei zwischen zwei Schienen gefaßt, von denen die zur Gummituchoberseite hin weisende Schiene als Spannleiste 8 ausgebildet ist. Die zur Rückseite hinweisende Schiene kann dabei als dünnes Blech 16 ausgebildet sein, das durch die hohe Formtreue der zugeordneten Spannleiste 8 stabilisiert wird. Die Spannleiste 8, das zugeordnete Blech 16 und das zugeordnete Ende des Gummituchs 1 sind durch Nieten 17 miteinander verbunden, die sich zweckmäßig im Bereich zwischen den zur Aufnahme der Spannschrauben vorgesehenen Bohrungen 18 befinden. Die Ausbildung der dem Blech 16 gegenüberliegenden Schiene als Spannleiste 8, d. h. die direkte Verbindung der Spannleiste 8 mit dem Gummituch 1 läßt auch bei verhältnismäßig geringer Nut- bzw. Grubentiefe die Verwendung vergleichsweise hoher und damit stabiler Spannleisten zu, die eine hohe Verbiegungssicherheit gewährleisten.In the exemplary embodiment on which FIG. 2 is based, the tensioning strips, likewise denoted by 8, are fastened directly to the respectively associated end of the rubber blanket 1. The ends of the rubber blanket 1 are gripped between two rails, of which the rail pointing toward the rubber blanket top is designed as a tensioning strip 8. The rail pointing towards the rear can be designed as a thin sheet 16, which is stabilized by the high dimensional accuracy of the associated clamping bar 8. The tensioning strip 8, the associated sheet 16 and the associated end of the rubber blanket 1 are connected to one another by rivets 17, which are expediently located in the area between the holes 18 provided for receiving the tensioning screws. The formation of the rail opposite the sheet 16 as a clamping bar 8, d. H. the direct connection of the tensioning strip 8 with the rubber blanket 1 allows the use of comparatively high and thus stable tensioning strips, which ensure a high degree of bending security, even with a relatively small groove or pit depth.

Die prinzipielle Grubenform und Schraubenanordnung der Anordnung gemäß Figur 1 gilt auch für die Ausführung gemäß Figur 2. Zur Bewerkstelligung einer verkantungsfreien Führung der Spannleisten in der jeweils zugeordneten Grubennut entspricht dabei die lichte Grubenweite der zusammengesetzten Breite von Spannleiste 8, Gummituch 1 und zugeordnetem Blech 16 zuzüglich eines leichten Verschiebespiels. Die Spannleiste 8 und das die Gegenschiene bildende Blech 16 werden dabei verkantungssicher an den Flanken der jeweils zugeordneten Grubennut geführt.The basic pit shape and screw arrangement of the arrangement according to FIG. 1 also applies to the embodiment according to FIG. 2. To accomplish a tilt-free Guide of the tensioning strips in the respectively assigned pit groove corresponds to the clear pit width of the combined width of tensioning strip 8, rubber blanket 1 and assigned sheet metal 16 plus a slight displacement play. The tensioning strip 8 and the sheet 16 forming the counter rail are guided cant-proof on the flanks of the respectively assigned pit groove.

Claims (5)

1. Gummituchspannvorrichtung für Offsetdruckmaschinen, insbesondere Rollenrotations-Offsetdruckmaschinen, bei der an den in eine Zylindergrube (3) einlaufenden Enden (4 bzw. 5) des Gummituchs (1) jeweils eine über die Grubenlänge sich erstreckende, im Querschnitt etwa rechteckige Spannleiste (8) angreift, die durch gleichmäßig über die Grubenlänge verteilte, grubenseitig gehaltene Spannschrauben (9) in Spannrichtung verstellbar sind, dadurch gekennzeichnet, daß die beiden Spannleisten (8) mittels jeweils unabhängig voneinander betätigbarer Spannschrauben (9) verstellbar sind und in jeweils einer zugeordneten, im Querschnitt etwa rechteckigen Nut (13) der Zylindergrube (3) aufgenommen sind, die zum Grubenboden hin erweitert ist und im Bereich des Grubenbodens einen mittleren, nach radial außen sich verjüngenden, die den beiden Spannleisten (8) zugeordneten Nuten (13) voneinander trennenden Steg (12) aufweist, dessen nutseitige Wandungen Auflageflächen für die in den hiervon jeweils begrenzten Nuten (13) aufgenommenen Spannleisten (8) bilden, die parallel zu den stegseitigen Auflageflächen von den zugeordneten Spannschrauben (9) durchsetzt sind und deren kleinere Breite zuzüglich eines geringen Montagespiels der Breite der Grubenöffnung (11) entspricht.1. Blanket tensioning device for offset printing machines, in particular web-fed offset printing machines, in which at the ends (4 or 5) of the blanket (1) entering a cylinder pit (3) each have a tensioning bar (8) that extends over the pit length and is approximately rectangular in cross section. attacks, which are adjustable in the clamping direction by clamping screws (9) held evenly over the pit length and held on the pit, characterized in that the two clamping bars (8) are adjustable by means of clamping screws (9) which can be actuated independently of one another and in each case in an assigned cross-section Rectangular groove (13) of the cylinder pit (3) is added, which is extended towards the pit floor and in the area of the pit floor has a central, radially outwardly tapering web (13) separating the grooves (13) assigned to the two clamping strips (8). 12), the nut-side walls Form support surfaces for the clamping bars (8) accommodated in the respective grooves (13) delimited by them, which are penetrated by the associated clamping screws (9) parallel to the web-side support surfaces and whose smaller width plus a small amount of assembly play corresponds to the width of the pit opening (11) . 2. Gummituchspannvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß an den Enden (4 bzw. 5) des Gummituchs vorzugsweise durch jeweils zwei parallele Schienen gebildete, nach außen weisende Eingriffsstufen bildende Verdickungen (6) vorgesehen sind, denen spannleistenseitig jeweils eine hiermit in Eingriff bringbare Gegenstufe (14) zugeordnet ist.2. blanket tensioning device according to claim 1, characterized in that at the ends (4 and 5) of the blanket preferably by two parallel rails formed, outwardly facing engagement stages forming thickenings (6) are provided, each of which can be brought into engagement with the tensioning strip side Counter level (14) is assigned. 3. Gummituchspannvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Verdickungen (6) durch die jeweils zugeordnete Spannleiste (8) in Anlage an der benachbarten Grubenseitenwandung (10) gehalten sind.3. blanket tensioning device according to claim 2, characterized in that the thickenings (6) are held in contact with the adjacent pit side wall (10) by the respectively assigned tensioning strip (8). 4. Gummituchspannvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Spannleisten (8) am jeweils zugeordneten Ende des Gummituchs (1) befestigt sind.4. blanket tensioning device according to claim 1, characterized in that the tensioning strips (8) are attached to the respectively associated end of the blanket (1). 5. Gummituchspannvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Breite der Spannleisten (8) zusammen mit den diesem jeweils zugeordneten Gegenleisten (16) und der Stärke des hiervon eingefaßten Gummituchs (1) der lichten Weite der jeweils zugeordneten Nut (13) entspricht.5. blanket tensioning device according to claim 4, characterized in that the width of the tensioning strips (8) together with the mating strips associated therewith (16) and the thickness of the rubber blanket (1) enclosed therein corresponds to the inside width of the respectively assigned groove (13).
EP19820101845 1981-03-14 1982-03-09 Rubber blanket tensioning device for offset printing machines Withdrawn EP0060492A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813109859 DE3109859C2 (en) 1981-03-14 1981-03-14 Blanket tensioning device
DE3109859 1981-03-14

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149036A2 (en) * 1984-01-17 1985-07-24 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Blanket cylinder for rotative offset printing machine
DE3538308A1 (en) * 1984-11-16 1986-05-22 Maschinenfabrik Wifag, Bern Device for attaching a rubber blanket to a blanket cylinder of a rotary printing machine
DE4210778A1 (en) * 1992-04-01 1993-10-07 Roland Man Druckmasch Blanket tension

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
DE3345369A1 (en) * 1983-12-15 1985-06-27 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach DEVICE FOR ATTACHING A PRINTING PLATE TO THE PLATE CYLINDER OF A PRINTING MACHINE
DE3813777A1 (en) * 1988-04-23 1989-11-02 Roland Man Druckmasch TENSIONING DEVICE FOR FASTENING A FLEXIBLE FILM
JPH0319038U (en) * 1989-06-30 1991-02-25
DE4425189C1 (en) * 1994-07-16 1996-02-01 Koenig & Bauer Albert Ag Method and device for fastening and tensioning an elevator on a cylinder of a rotary printing press
DE19616337C2 (en) * 1996-04-24 1999-04-15 Roland Man Druckmasch Method and device for fastening and tensioning a printing blanket

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US1545791A (en) * 1925-03-28 1925-07-14 Owen Malcolm Printing cylinder
US2121309A (en) * 1935-03-28 1938-06-21 Standard Process Corp Rotary printing press
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DE419666C (en) * 1923-03-28 1925-10-07 Linotype Machinery Ltd Device for mounting flexible printing plates on the plate cylinder
GB925330A (en) * 1961-11-14 1963-05-08 Miehle Goss Dexter Inc Blanket lockup arrangement
US3893394A (en) * 1973-03-28 1975-07-08 Wood Industries Inc Blanket cylinder slot arrangement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149036A2 (en) * 1984-01-17 1985-07-24 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Blanket cylinder for rotative offset printing machine
EP0149036A3 (en) * 1984-01-17 1985-08-07 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Blanket cylinder for rotative offset printing machine
DE3538308A1 (en) * 1984-11-16 1986-05-22 Maschinenfabrik Wifag, Bern Device for attaching a rubber blanket to a blanket cylinder of a rotary printing machine
DE4210778A1 (en) * 1992-04-01 1993-10-07 Roland Man Druckmasch Blanket tension
US5329853A (en) * 1992-04-01 1994-07-19 Man Roland Druckmaschinen Ag Blanket clamping device

Also Published As

Publication number Publication date
DE3109859A1 (en) 1982-09-23
DE3109859C2 (en) 1983-05-11
JPS57160644A (en) 1982-10-04

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