Method for roller adjustment in a printing press and dampening unit of a printing press

Abstract

A method for roller adjustment in a printing press includes providing a first roller, a second roller and a third roller. The second roller bears both against the first roller and against the third roller and is oriented in an axially nonparallel manner relative to the third roller. The first roller is displaced into a position in which the first roller is oriented in an axially nonparallel manner relative to the third roller. A dampening unit for carrying out the method is also provided.

Description

technical field

[0001] The invention relates to a method of roller adjustment in a printing press and a dampening device of a printing press which is suitable for carrying out the method. Background technique

[0002] The dampening unit of a printing press generally comprises a plurality of rollers which are brought into contact with one another under pressure. Due to the pressure, these rollers bend in the axial direction. The bending of the rolls in turn leads to uneven metering of dampening medium along the roll gap. To overcome this undesired effect different countermeasures are disclosed, namely the so-called wrapping of one roll around the other and the so-called skewing of one roll relative to the other

[0003] Said winding is described in German laid-open document DE-OS 2054678. In the dampening device described in this publication, the metering rollers are mounted in levers which are arranged to pivot about the axis of rotation of an impregnating roller. Owin...

Examples

Embodiment Construction

[0019] figure 1 A printing press 4 is shown in , which has a printing plate cylinder 5 and a dampening device 6 for moistening the printing plate cylinder 5 . The printing press 4 is an offset printing press for printing sheets. The dampening device 6 comprises an impregnation roll 1 as a first roll, a metering roll 2 as a second roll and a dampening roll 3 as a third roll. In addition to the metering roller 2 , the touch roller 3 abuts against a not shown oscillating roller, which oscillates in the axial direction. The impregnation roll 1 is arranged in a bucket 7 in order to draw dampening medium from the bucket. The metering roll 2 is arranged as an intermediate roll between the impregnation roll 1 and the dampening roll 3 and transfers dampening medium from the impregnation roll to the dampening roll.

[0020] exist figure 2 In , the plate cylinder 5 is not shown for the sake of clarity. figure 2 It is shown that the rollers 1 , 2 and 3 are arranged on a frame wall ...

technical field

[0001] The invention relates to a method of roller adjustment in a printing press and a dampening device of a printing press which is suitable for carrying out the method. Background technique

[0002] The dampening unit of a printing press generally comprises a plurality of rollers which are brought into contact with one another under pressure. Due to the pressure, these rollers bend in the axial direction. The bending of the rolls in turn leads to uneven metering of dampening medium along the roll gap. To overcome this undesired effect different countermeasures are disclosed, namely the so-called wrapping of one roll around the other and the so-called skewing of one roll relative to the other

[0003] Said winding is described in German laid-open document DE-OS 2054678. In the dampening device described in this publication, the metering rollers are mounted in levers which are arranged to pivot about the axis of rotation of an impregnating roller. Owin...

Examples

Embodiment Construction

[0019] figure 1 A printing press 4 is shown in , which has a printing plate cylinder 5 and a dampening device 6 for moistening the printing plate cylinder 5 . The printing press 4 is an offset printing press for printing sheets. The dampening device 6 comprises an impregnation roll 1 as a first roll, a metering roll 2 as a second roll and a dampening roll 3 as a third roll. In addition to the metering roller 2 , the touch roller 3 abuts against a not shown oscillating roller, which oscillates in the axial direction. The impregnation roll 1 is arranged in a bucket 7 in order to draw dampening medium from the bucket. The metering roll 2 is arranged as an intermediate roll between the impregnation roll 1 and the dampening roll 3 and transfers dampening medium from the impregnation roll to the dampening roll.

[0020] exist figure 2 In , the plate cylinder 5 is not shown for the sake of clarity. figure 2 It is shown that the rollers 1 , 2 and 3 are arranged on a frame wall ...

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