DE102008000725A1 - Inking unit and dampening unit - Google Patents

Abstract

The invention relates to an inking unit (2) and optionally a dampening unit (3) for a printing unit of a processing machine with at least one printing unit roller having a surface with hydrophilic and oleophilic surface portions. In order to provide a good ink / fountain solution balance, the printing couple roller is interchangeable with at least one other printing couple roll having other hydrophilic and oleophilic properties.

Description

The The invention relates to an inking unit and optionally a dampening unit a printing unit of a processing machine according to the The preamble of claim 1. The printing unit is particularly suitable for offset printing.

The DE 40 13 463 C2 shows a printing unit of a rotary printing press with a form and a transfer cylinder, wherein an inking unit and a dampening unit are arranged on the forme cylinder. The inking unit supplies ink to the printing areas of a printing plate arranged on the forme cylinder, while the dampening unit moistens the non-printing areas of the printing plate.

at This device is disadvantageous that on the applicator roll of the dampening unit accumulating color led into the dampening unit and that on the applicator rollers of the inking unit itself accumulating fountain solution are fed into the inking unit can and thus the color / dampening solution balance in the printing unit is impaired. These fluctuations can on the substrate in the form of visible disturbances, For example stencil appearances, roller strips or cord strips (Streaks), show.

The DE 199 26 833 A1 proposes a bridging roll connecting a paint applicator and a dampening applicator roll or rider rolls disposed on said applicator rolls, each having a surface having hydrophilic and oleophilic portions. Also hereby Störschablonen are not reliably degraded.

It is the object of the invention, in an inking unit and optionally To create a dampening system a good color / dampening solution balance.

The Invention is in a generic color or dampening unit according to the invention the characterizing features of claim 1 solved.

thanks the interchangeability of the first printing roller can be simple One with regard to their hydrophilic and / or oleophilic properties adapted to the subject printing roller can be used. It is thereby a good homogenization of the color / water emulsion preferably achievable on wet and inking rollers. So far from the plate cylinder channel, roll strip and subject originating Disturbances are noticeably reduced, so that the Print quality can be improved.

Further Features and advantages emerge from the dependent claims in conjunction with the description.

The Invention is intended below to some embodiments be explained in more detail. In the associated Drawings shows schematically:

1 : a dyeing and dampening unit, partially shown,

2 : a dampening unit.

In 1 are partially a form cylinder 1 as well as an inking unit 2 and a dampening unit 3 a printing unit shown. From the inking unit 2 are only two inking rollers 4 . 5 shown, wherein on the former a rider roll 6 is arranged, which has a lateral surface with hydrophilic and oleophilic surface portions. The rider roll 6 is together with two other rider rolls 7 . 8th in a magazine 9 stored, with the other rider rolls 7 . 8th each to the rider roll 6 have other hydrophilic and oleophilic properties. The magazine is designed similar to a turret. By a turn 10 of the magazine 9 is the rider roll 6 out of its shown use position and depending on the direction of rotation of the rider roller 7 or 8th movable into the insertion position.

In 1 is still a bridge roller 11 shown with the inking roller 5 as well as with a dampening roller 12 of the dampening unit 3 communicates. The bridge roller 15 has a lateral surface with hydrophilic and oleophilic surface portions. The bridge roller 11 is with two other bridge rollers 13 and 14 in a magazine 15 held, with the other bridge rollers 13 . 14 to the bridge roller 11 each have different hydrophilic and oleophilic properties. By a turn 16 of the magazine 15 is the bridge roller 11 movable out of its shown use position and depending on the direction of rotation of the bridge roller 13 or 14 movable into the insertion position.

According to 2 is on a partially illustrated form cylinder 17 a dampening unit 18 arranged. The latter contains a dampening roller 19 , which together with two other dampening rollers 20 and 21 in a magazine 22 is held. By a turn 23 of the magazine 22 is the dampening roller 19 out of its shown insertion position and depending on the direction of rotation one of the two dampening rollers 20 or 21 movable into the insertion position. Before executing the rotation 23 leads the magazine 22 a swing 24 out, at which the dampening roller 19 from her adjacent dampening roller 18 is moved away. Instead of the swing 24 could also be a shift. After the dampening roller 20 or 21 the position of the dampening roller 19 has taken the magazine 22 back up the dampening unit 18 too moved. The dampening roller 19 has a lateral surface with hydrophilic and oleophilic surface portions. The dampening rollers 20 and 21 have opposite the dampening roller 19 each have different hydrophilic and oleophilic properties.

With a similar magazine can also change the inking roller 4 an inking unit 2 respectively. This use case is in 2 with bracket positions indicated.

The different hydrophilic and oleophilic properties of the magazines 9 . 15 . 22 located printing unit rollers are realized by different ratios of the hydrophilic and oleophilic surface portions of the Mantelflä surface of the printing unit rollers. Instead, or in addition, the hydrophilic and / or oleophilic surfaces of the in the magazines could 9 . 15 . 22 located printing press rollers also have different surface energies. Materials having hydrophilic or oleophilic properties for the surfaces of the printing-unit rollers are familiar to the person skilled in the art and are described, for example, in US Pat DE 10 2008 007 679.1 called.

1

form cylinder

2

inking

3

dampening

4

Inking roller

5

Inking roller

6

riding roller

7

riding roller

8th

riding roller

9

magazine

10

rotation

11

bridge roller

12

Dampener roller

13

bridge roller

14

bridge roller

15

magazine

16

rotation

17

form cylinder

18

dampening

19

Dampener roller

20

Dampener roller

21

Dampener roller

22

magazine

23

rotation

24

swing

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4013463 C2 [0002]
• - DE 19926833 A1 [0004]
• - DE 102008007679 [0016]

Claims (7)

Inking unit and optionally dampening unit for a printing unit of a processing machine with printing unit rollers, wherein at least one printing unit roller has a surface having hydrophilic surface portions and oleophilic surface portions, characterized in that the printing unit roller is interchangeable with at least one other printing unit roller with other hydrophilic and / or oleophilic properties. Inking unit and optionally dampening unit according to claim 1, characterized in that the printing unit roller and the further printing unit roller (s) in a magazine ( 9 . 15 . 22 ) and that by means of the magazine ( 9 . 15 . 22 ) the printing unit roller is movable out of an insertion position and another printing unit roller is movable into the insertion position. Inking unit and optionally dampening unit according to claim 1 or 2, characterized in that the printing unit roller as an inking roller or a rider roller ( 5 ) of the inking unit ( 2 ) is trained. Inking unit and optionally dampening unit according to claim 1 or 2, characterized in that the printing unit roller as a dampening roller ( 19 ) or a rider roller of the dampening unit ( 18 ) is trained. Inking unit and optionally dampening unit according to claim 1 or 2, characterized in that the printing unit roller as one with a inking roller ( 5 ) of the inking unit ( 2 ) and a dampening roller ( 12 ) of the dampening unit ( 3 ) associated bridge roller ( 11 ) is trained. Inking unit and optionally dampening unit according to claim 1 or 2, characterized in that the further printing unit roller opposite the printing unit roller with a surface a different ratio of hydrophilic and oleophilic Has area shares. Inking unit and optionally dampening unit according to claim 1 or 2, characterized in that the hydrophilic and / or oleophilic area proportions of the surface of the other Printing roller against the hydrophilic and / or oleophilic Area shares of the first printing unit roller changed surface energies exhibit.