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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: 2010-11-17
HEIDELBERGER DRUCKMASCHINEN AG
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  • 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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Embodiment Construction

[0036] exist figure 1 The sheet-fed offset printing machine 1 shown in a tandem configuration has a feeder 2 and four printing units 7a-d for the four primary colors black, yellow, magenta and cyan, the unprinted sheet stacks 3 is located in the paper feeder. The delivery 12 of this printing press follows the fourth printing unit 7d. The gripper bridges run around in this delivery with the aid of chain guides. These gripper bridges receive the printed sheets and guide them to the sheet stack, where they are laid down.

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

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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 invention relates to a rotary offset printing machine with an inking unit and a dampening roll, the inking unit has a plurality of inking unit rolls, the dampening medium is fed from the porous discharged from the surface. Background technique [0002] Rotary offset printing presses, i.e. web or sheet-fed offset printing presses, usually have in each printing unit an inking unit with a plurality of inking unit rollers, which feed the ink flow from the ink container (ie the cartridge) is guided to the offset printing plate on the plate cylinder, where it is leveled, if necessary laterally leveled, etc. Furthermore, in so-called wet offset printing, a dampening device is required which wets the offset printing forme on the hydrophilic regions of the printing forme and ensures that the printing forme does not receive ink there. Such dampening devices are usually designed according to the suction principle, that is to say, a so-called dipping roller ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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