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Method for operating wetting device of printer

A printing press, wetting agent technology, applied in printing presses, general parts of printing machinery, rotary printing presses, etc., can solve the problem of unsolved stripes and other problems

Active Publication Date: 2011-10-05
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

Experimental program
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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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Abstract

The invention relates to a method for operating a wetting device of a printer, wherein the rotating roller of a wetting agent applying roller relates to the clamping channel variation of a printing plate roller. The wetting agent applying roller rolls on the printing plate roller. Herein, the rotating speed of the wetting agent applying roller varies when the printing plate roller rotates for a circle such that the speed difference between the circumference face of the printing plate roller and the circumference face of the wetting agent applying roller varies when the wetting agent applying roller passes through the clamping channel.

Description

technical field [0001] The invention relates to a method for operating a dampening device of a printing press according to the preamble of claim 1, wherein the rotational speed of the dampening agent application roller is varied with respect to the clamping channel of the plate cylinder, the dampening agent application A roller rolls on the plate cylinder. 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...

Claims

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Application Information

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IPC IPC(8): B41F33/10B41F7/26
CPCB41F33/0054B41F7/26
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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