DE8433674U1 - DEVICE FOR MOUNTING A RUBBER BLANKET ON A RUBBER BLANKET CYLINDER OF A ROTARY PRINTING MACHINE - Google Patents

Description

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Maschinenfabrik Wifag, Bern

Device for pulling a rubber blanket onto a rubber blanket cylinder a rotary printing press

The invention relates to a door direction for opening a Blankets on a blanket cylinder of a rotary printing press, the entire blanket with a carrier layer is connected to a blanket unit.

Such devices are in the most varied of designs known, wherein the carrier layer consists of a fabric-like, somewhat stretchable material. It shows e.g. the EP-OS 0 060 4-92 a blanket tensioning device for an offset printing machine. Here, the blanket is both at its, leading, as well as at its: trailing end by means Tensioning screws attached to a cylinder pit across the entire span. About the expansion of the rubber blanket To keep it as small as possible by flexing during operation, the rubber blanket must have a high tension, whereby appropriately designed clamping devices are required with which these large clamping forces can be applied are. These big requirements for tensioning the rubber blanket can lead to the so-called "sickle effect", i.e. that the thickness of the rubber blanket depends on the. Clamping devices the most distant point is greater than in the immediate vicinity Proximity of the jigs. 2 for operating the tensioning screws In addition, a relatively wide pit opening is required, which when unrolling the blanket cylinder.

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gear on plates and impression cylinders to hit and Can lead to vibrations.

Also known are rubber blankets that are glued onto the cylinder will. The adhesion of the leading edge is particularly important in the case of high-speed rotary printing machines problematic · It is not possible to simply change the blankets.

The object of the invention is to provide a device for pulling a rubber blanket onto a rubber blanket cylinder create in which stretching due to flexing is practically impossible, and in which different thicknesses can also be avoided during the tensioning process, but the forces for tensioning the rubber blanket are also kept very small can.

According to the invention, the object is achieved in that the leading End of the blanket unit, the carrier layer of which consists of at least one dimensionally stable plate, at an acute angle bent and can be inserted into a corresponding slot machined axially parallel into the rubber blanket cylinder and a holding device is arranged for holding the trailing end of the blanket unit in the blanket cylinder.

This device makes it possible to keep the clamping channel very small, resulting in very little cylinder weakening Consequence. As a result of the small clamping forces, the clamping device can be designed simply and inexpensively. Simultaneously it is achieved that the gap between the beginning of the blanket and the end of the blanket is kept extremely small on the working circumference which contributes significantly to the reduction of vibrations. Replacing the blanket unit can be very done quickly and easily.

The drawing shows a possible embodiment of the Device, which will be explained in more detail below; will.

A blanket cylinder 1 shown schematically in section a printing machine, which rotates in the direction of arrow 2 about its longitudinal axis, has an axially parallel incorporated Slot 3, in soft the leading end of a blanket unit 4 ·, which is bent at an acute angle, is inserted. The blanket unit 4 consists of a dimensionally stable one I? latte 5 as a carrier layer, which can be a metal plate, for example, onto which a rubber blanket 6 is drawn on one side is. The connection between dimensionally stable plate 5 and rubber blanket 6 can be achieved, for example, by gluing or vulcanization.

The trailing end of the rubber cylinder 1 wrapping around it Blanket unit 4 is designed so that the dimensionally stable plate 5 extends into the slot 3 of the blanket cylinder 1, while the blanket 6 ends directly at the bend 7 of the dimensionally stable plate 5, and the edge 8 of the acute-angled bent leading end of dex · blanket unit 4-almost touched.

A cylindrical tensioning lever 9 is located in the blanket cylinder 1 in a corresponding recess 14, which together with the slot 3 forms the clamping channel 13, rotatable about its longitudinal axis stored. This clamping lever 9 has a number of cams which are spaced along a surface line of the clamping lever 9 are firmly attached to each other. This squat 10 have claws 11 which are in corresponding recesses 12 on the dimensionally stable plate 5 can hook.

A known rotating device, not shown, on the Front side of the rubber blanket cylinder 1 allows by turning.

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of the clamping lever 9 on the one hand, the dimensionally stable plate 5 in the Hang the cam IO, on the other hand the dimensionally stable plate 5 and thus the blanket unit 4 at its trailing end to hold in the blanket cylinder 1 respectively. to tension, whereby the twisting device is fixed in the appropriate position or can be supported by spring force.

Claims (3)

DEMANDS 1. Apparatus for pulling a rubber blanket onto a rubber blanket cylinder of a rotary printing machine, the entire rubber blanket being connected to a carrier layer to form a rubber blanket unit, characterized in that the leading end of the rubber blanket unit (4-), the carrier layer of which consists of at least one dimensionally stable plate (5) is an acute angle bent and is inserted into a corresponding to the blanket cylinder (l) parallel to the axis incorporated slot (3) and the Gummituchc ^j .inheit (4) is arranged a holding device in the blanket cylinder (l) for holding the trailing end. 2. Device according to claim 1, characterized in that .am the trailing end of the blanket unit (4) the dimensionally stable Plate (5) to be inserted into the holding device in the blanket cylinder (l) protrudes beyond the end of the rubber blanket (6). 3. Apparatus according to claim 2, characterized in that the trailing end of the rubber blanket (6) with its edge against the bent edge of the leading end of the blanket unit (4 ·) almost comes to rest, while the dimensionally stable Plate (5) in an axially parallel clamping channel (13) of the blanket cylinder (l) by means of a clamping device (9) is held. (Mt till • * ■ *