Method for operating wetting device of printer

A printing machine and wetting agent technology, which is applied to printing machines, general parts of printing machinery, rotary printing machines, etc., and can solve problems such as unresolved stretching stripes

Active Publication Date: 2015-06-03
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Said prior art does not solve the problem of so-called development streaks (Abwicklungsstreifen), which are produced by the dampening agent application roller inside the printing image area of ​​the printing plate on the plate cylinder

Method used

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  • Method for operating wetting device of printer
  • Method for operating wetting device of printer
  • Method for operating wetting device of printer

Examples

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Embodiment Construction

[0025] figure 1 A detail of a printing press 1 is shown in FIG. 2 , which shows a printing unit of the printing press 1 for offset offset printing on printed sheets. The printing unit includes, in addition to an impression cylinder and a blanket cylinder, which are not shown in the figures, a plate cylinder 2 . An inking unit 3 , which is formed from a plurality of rollers (not shown in detail), is used for inking a printing form stretched on the printing form cylinder 2 . The dampening device 4 serves to dampen the plate cylinder with dampening medium.

[0026] The dampening device 4 comprises a dampening bucket 5 in which the dampening medium is stored, an impregnating roll 6 which draws the dampening medium from the dampening bucket 5, a metering roll 7 for metering the dampening medium and for applying the dampening medium to the A dampening agent application roller 8 on the plate cylinder 2 . The metering roller 7 rests against the impregnation roller 6 and the dampeni...

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PUM

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Abstract

The method involves varying rotation speed of a dampening roller (8) with respect to a pre-stressing duct (15) of a plate cylinder (2), where the dampening roller is rolled on the plate cylinder. The rotation speed of the dampening roller is varied by revolution of the plate cylinder such that velocity difference between peripheral surfaces of the plate cylinder and the dampening roller is changed when the dampening roller is passed into the pre-stressing duct. The velocity difference is increased and reduced in a stepwise manner during revolutions of the plate cylinder. An independent claim is also included for an offset printing machine comprising a control device.

Description

technical field [0001] The invention relates to a method for operating a dampening unit of a printing press, wherein the rotational speed of the dampening agent application roller is varied with respect to the nip channel of a plate cylinder on which the dampening agent application roller rolls. Background technique [0002] It is known that the dampening medium fluctuates through the clamping channel. During the travel of the dampening agent application roller across the nip channel, the dampening agent application roller does not deliver dampening medium to the printing plate cylinder and an excess of dampening medium remains on said dampening agent application roller. The dampening agent application roller transfers the excess dampening medium to the cylinder section following the nip channel. This results in local overwetting, which reduces the print quality. [0003] Various solutions have been proposed to eliminate or compensate the indentation of the clamping channe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F33/10B41F7/26
CPCB41F7/26B41F33/0054
Inventor O·诺瓦拉W·施图茨F·克罗普M·施万特U·普福勒P·海勒尔M·明斯特尔M·迈尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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