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Method for operating printing press

A printing press and ink technology, applied in printing presses, general parts of printing machinery, printing and other directions, can solve the problems of technology consumption, water is not compensated, ink is not updated, etc., to reduce the effect of starting waste pages

Active Publication Date: 2015-11-25
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These solutions have the disadvantage that, on the one hand, the method is technically complex and, on the other hand, for example in the case of UV-inks, can form rings in the ink mechanism.
Likewise, the evaporated moisture is not compensated and the ink is not renewed

Method used

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  • Method for operating printing press
  • Method for operating printing press
  • Method for operating printing press

Examples

Experimental program
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Embodiment Construction

[0029] exist figure 1 A printing press for printing sheets is partially shown in the middle. This partial view shows part of a printing mechanism for lithographic offset printing. A printing form cylinder 1 with printing formes 2 is inked by means of an inking unit 3 . The ink unit 3 comprises an ink fountain 4 with a metering device 5 and an ink fountain roller 6 . The lift roller 7 vibrates from the ink fountain roller 6 to the friction roller 8 and back. The ink is transferred from the plate cylinder 1 to the blanket cylinder 9 and from there to the sheet. The ink key opening of the metering device 5, the rotational movement of the ink fountain roller 6 and the pendulum movement of the lift roller 7 are all controlled by the control device 10 according to the programming of the control device.

[0030] exist figure 2 A schematic diagram of the working process is shown in . The printing press first processes the first print job 11 and then the second print job 12 . I...

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PUM

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Abstract

In a method for operating a printing press, when an interruption of a printing process occurs during a print job, an ink profile in an inking unit is at least partly reduced or evened out in a first step by interrupting a supply of ink and printing a defined number of sheets while the ink supply is interrupted and by having a cylinder carry out a defined number of revolutions in the process. In a second step the ink profile is completely built up again by resuming the supply of ink and carrying out a reintroduction of ink without printing on the same defined number of sheets while the cylinder carries out the same defined number of revolutions in the process.

Description

technical field [0001] The invention relates to a method of operating a printing press. Background technique [0002] When printing a print job, the printing press stops for various reasons (eg cleaning of the blanket, changing the sheet stack). During such breaks, the ink feature profile is undesirably homogenized on the roller, and the ink reacts with the air or loses moisture. During a restart, this situation leads to so-called start-up waste, ie to incorrectly printed sheets, which cannot be sold. In order to avoid an undesired homogenization of the ink feature profile, mechanical solutions are applied (for example, separating the ink mechanism roller set during a printing break, stopping the rubbing roller train movement during a printing break). These solutions have the disadvantage that, on the one hand, the method is technically complex and, on the other hand, for example in the case of UV inks, can form rings in the ink mechanism. Likewise, the evaporated water i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41F33/10B41F31/30
CPCB41F33/10
Inventor N·普法伊费尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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