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Rotary flat-bed printing machine

A technology for printing presses and lithography, applied in the field of rotary lithographic printing presses, can solve the problems of contamination of the wetting medium roller, ink blockage, unevenness of difficult-to-wet medium, etc.

Inactive Publication Date: 2012-07-04
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the prior art, therefore, these porous dampening rollers are pressed directly onto the dampening application roller, since they have an elastic roller shell, whereas the porous diaphragm rollers consist of sintered metal and through this way to obtain a well-adjustable gap between the rollers for the delivery of the dampened medium, which is not possible with two hard rollers
[0005] In this arrangement it is difficult to compensate for inhomogeneities of the dampening medium on the roller surface due to the short transfer path to the plate
Finally, there is also the problem that the dampening applicator roller also transfers the ink back to a certain extent from the printing plate onto the porous dampening roller, so that it is contaminated and the ink clogs the pores

Method used

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  • Rotary flat-bed printing machine
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  • Rotary flat-bed printing machine

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Embodiment Construction

[0036] exist figure 1 The sheetfed offset printing press 1 shown in tandem configuration has a feeder 2 and four printing units 7a-d for the four primary colors black, yellow, magenta and cyan, unprinted stacks of sheets 3 in the feeder. The take-up reel 12 of the printing press follows the fourth printing unit 7d. The gripper bridge runs around the delivery reel by means of chain guides. These gripper bridges receive the printed sheets and guide them to the stack of sheets where they are laid down.

[0037]The printing unit 7a has an impression cylinder 4a, a blanket cylinder 5a and a printing plate cylinder 6a on which the respective printing plates are tensioned. Correspondingly, the same is true for the other three printing units 7b-d. The printing plate is inked with inking units 8a-d, the rollers of which cover most of the cylinder circumference of the plate cylinder. The four rollers of the dampening unit 9a are connected to the corresponding inking unit, eg 8a, w...

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Abstract

The invention relates to a rotary flat-bed printing machine having an inking unit with a plurality of inking rolls and a dampening unit with a plurality of dampening rolls, wherein one of the dampening rolls (34) has a porous surface from which the dampening agent exits. In the dampening agent flow, between the dampening roll (34) having the porous surface and the plate cylinder (6a), at least two further rolls (35, 37) are arranged.

Description

technical field [0001] The present invention relates to a rotary lithographic printing press having an inking unit and a dampening medium roller, the inking unit having a plurality of inking unit rollers, and the dampening medium passing from the porous pores of the dampening medium roller discharged from the surface. Background technique [0002] Rotary lithographic printing presses, ie, for example, web-fed or sheet-fed offset printing presses generally have in each printing unit an inking unit with a plurality of inking unit rollers which direct the flow of ink from the ink container (ie the ink cartridge) is guided to the offset printing plate on the plate cylinder, where it is homogenized, if necessary laterally leveled, etc. Furthermore, in so-called wet offset printing, a wetting device is required, which wets the offset printing plate on the hydrophilic regions of the printing plate and ensures that the printing plate does not receive ink there. Wetting devices of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F7/26
CPCB41F7/265
Inventor R·伯姆A·豪克J·霍伊施克尔
Owner HEIDELBERGER DRUCKMASCHINEN AG