DE19958631A1 - Sheetfed offset printing machine - Google Patents

Abstract

The invention relates to sheet-fed offset printing presses, consisting of at least one printing unit with a printing cylinder, a blanket cylinder in contact therewith and a plate cylinder, wherein the plate cylinder is assigned an inking and dampening unit and the printing cylinder of the last printing unit is followed by two transfer drums. DOLLAR A object of the invention is to provide a sheet-fed offset printing press in which the functional scope of the sheet-fed offset printing press is expanded by the installation of several special devices in the area of the delivery. DOLLAR A According to the invention the object is achieved in that the plate cylinder (12) is assigned an inking and dampening unit (14) and the printing cylinder (11) of the last printing unit (1) seen in the sheet conveying direction, two transfer drums (21; 22) are arranged downstream and the first transfer drum (21) and / or the second transfer drum (22) is assigned at least one special device (4; 5; 6; 7; 8; 9) and that in addition at least two transfer drums (23; 24) the last printing unit (1 ) downstream in the sheet conveying direction and special devices (4; 5; 6; 7; 8; 9) are optionally assigned to the transfer drums (21; 22; 23; 24).

Description

The invention relates to a sheetfed offset printing press consisting of at least one Printing unit with a printing cylinder, a blanket in contact with it cylinder and a plate cylinder, the plate cylinder being an inking and dampening unit is assigned and the printing cylinder of the last printing unit (in the sheet conveying direction ge see) two transfer drums are arranged downstream.

From DE 19 72 074 A1 a sheetfed offset printing press is known, in which within the Sheet discharge device two transfer drums are arranged. The two surrender drums are placed between the impression cylinder and the sheet delivery. It can to expand the range of functions of sheetfed offset printing presses a special device who is immediately assigned to the upstream transfer drum the. Such special devices can include drying devices, powder devices, Painting equipment or the like.

The disadvantage of this is that the space for installing the special equipment is limited.

The object of the invention is to provide a sheetfed offset printing press in which by installing several special devices in the area of the display of the functional area beginning of the sheet-fed offset printing press is expanded.

This object is achieved by the features of the 1st and 2nd claims.

The advantage of the solution according to the invention is that now the range of functions the sheetfed offset press can be expanded significantly. Due to the installation width rer Schön and / or Druckdruckwerke z. B. applied other colors inexpensively become. With more painting equipment, a more refined product is by far less effort than before.

The invention will be explained in more detail below using two exemplary embodiments become.

The drawings for this have the following meaning.

Fig. 1 Schematic representation of the device according to the invention with two ordered transfer drums and special units.

Fig. 2 Schematic representation of the device according to the invention with four ordered transfer drums and special units.

As can be seen from FIG. 1, here are a printing unit 1 , two transfer drums 21 ; 22 and a display 3 arranged. The printing unit 1 includes an inking and dampening unit 14 which interacts with a plate cylinder 12 . The ink is transferred to a printing cylinder 11 via a blanket cylinder 13 .

Downstream of the printing cylinder 11 are two transfer drums 21 ; 22 , which are equipped with a closed surface and can thus act as an impression cylinder. The transfer drum 22 interacts with a chain 31 . This is guided over a front chain deflection wheel 32 , a rear chain deflection wheel 33 and other guide elements, not designated here or not shown, on a defined path.

Below the delivery 3 is a delivery stack 34 for storing the printed sheets.

An anilox offset printing unit 4 is assigned to the first transfer drum 21 in the exemplary embodiment as a special device. Here, in addition to an ink roller 45 with Farb-Kammerra angle 44, a dampening roller 47 with a dampening doctor blade 46 for supplying dampening agent to the inking roller 43 is arranged. The anilox offset printing unit 4 is designed such that it can also be disengaged, that is to say switched off.

The second transfer drum 22 is assigned a drying device 5 and / or a cutting device 6 as special devices.

How the device according to the invention works.

The printing sheet is conveyed to the printing cylinder 11 and printed on its face side with the illustrated conventional printing unit 1 with color. The Druckbo gene has in the last printing unit 1 shown in the figures, as a rule, already have several ink jobs on its face side and, if applicable, on its reverse side. After this last ink application on the face printing side, it is now transferred to the transfer drum 21 via a gripper system (not shown) and comes into contact with the rubber cylinder 41 of the anilox offset printing unit 4 in the wide sheet run (see course of the arrows). This means that a layer of color is applied to the wi-print side.

The printed sheet is then taken over by the second transfer drum 22 by the gripper (not shown) gripping it. The cutting device 6 can now be used and cut the printed sheet. The printed sheet then comes into the area of the drying device 5 , so that, if necessary, the face side can be dried here.

In the further course of the sheet guide, the printed sheet is taken over by the grippers (not shown) of the chain 31 , conveyed into the area of the delivery 3 and deposited there on the delivery stack 34 .

A further embodiment of the invention is shown in FIG. 2. The structure of the printing unit 1 including the transfer drum 21 corresponds to the example described in FIG. 1 be. In this example, however, two further transfer drums 23 ; 24 arranged. This offers space for several special devices on both the beautiful and reverse side. For design reasons, the transfer drum 22 ; 23 ; 24 half the size of the transfer drum 21 .

The transfer drum 21 is a conventional inking unit 8 , consisting of an inking unit 81 , a dampening unit 82 , a plate cylinder 83 and a blanket cylinder 84 , assigned.

From FIG. 2 it can also be seen that, for example, a coating module 9 is arranged on the transfer drum 22 and a short application unit 7 can be set on the transfer drum 23 . The short application unit 7 can in turn be an anilox offset printing unit. However, it is also possible to use an anilox printing unit.

A transfer device 5 is assigned to the transfer drum 24 here, for example.

How it works

The printing of the printed sheets and their sheet travel corresponds to that described under Fig. 1. Again, the back printing takes place on the transfer drum 21 , but here with the conventional inking unit 8 . The printed sheet is then transferred to the transfer drum mel 22 , on which it can then be provided with a coating by the coating module 9 . In the further sheet run, the printed sheet can then be provided with a varnish or a paint application on the transfer drum 23 by the short application unit 7 arranged there. The previously applied coating can be dried by the dryer 5 on the transfer drum 24 .

The invention is not limited to the exemplary embodiments described with reference to FIGS. 1 and 2. Instead of two or four transfer drums 21 ; 22 ; 23 ; 24 , it is also possible to use transfer drums even further. The condition is that the number of transfer drums used is always an even number, since otherwise the counterprint side would point upwards during storage. It should also be noted that the individual transfer drum must always be equipped with a surface adapted to the function. If there is back pressure or painting, the surface must be closed and resilient. If the printed sheet is only to be dried, the equipment as a transfer drum is sufficient.

List of the reference symbols used

1

Printing unit

11

Impression cylinder

12th

Plate cylinder

13

Blanket cylinder

14

Ink and dampening system

21

Transfer drum

22

Transfer drum

23

Transfer drum

24th

Transfer drum

3rd

Display

31

Chain

32

front chain idler

33

rear chain idler

34

Delivery pile

4th

Anilox offset printing unit

41

Rubber cylinder

42

Plate cylinder

43

Inking roller

44

Color chamber doctor blade

45

Ink roller

46

Moisture chamber doctor blade

47

Dampening roller

5

Drying facility

6

Cutting device

7

Short order work

8th

conventional inking unit

81

Inking unit

82

Dampening system

83

Plate cylinder

84

Blanket cylinder

9

Paint module

Claims (8)

1. Sheet-fed offset printing machine, comprising at least one printing unit ( 1 ) with a printing cylinder ( 11 ), a blanket cylinder ( 13 ) in contact with it and a plate cylinder ( 12 ), the plate cylinder ( 12 ) having an inking and dampening unit ( 14 ) is assigned and the printing cylinder ( 11 ) of the last printing unit ( 1 ), seen in the direction of sheet conveyance, is followed by two transfer drums ( 21 ; 22 ) and the first transfer drum ( 21 ) and / or the second transfer drum ( 22 ) has at least one special device ( 4 ; 5 ; 6 ; 7 ; 8 ; 9 ) is assigned. 2. Sheet-fed offset printing machine, comprising at least one printing unit ( 1 ) with a printing cylinder ( 11 ), a blanket cylinder ( 13 ) in contact with it and a plate cylinder ( 12 ), the plate cylinder ( 12 ) having an inking and dampening unit ( 14 ) is associated and the pressure cylinder (11) of the last printing unit (1) in Bogenför seen the direction two transfer drums (21; 22) are arranged downstream, characterized in that in addition at least two transfer drums (23; 24) arranged downstream of the last printing unit (1) in the sheet conveying direction and special devices ( 4 ; 5 ; 6 ; 7 ; 8 ; 9 ) are optionally assigned to the transfer drums ( 21 ; 22 ; 23 ; 24 ). 3. Sheetfed offset printing machine according to claim 2, characterized in that the number of Transfer drums must always be divisible by two. 4. Sheet-fed offset printing machine according to claim 1 or 2, characterized in that a counter-printing unit ( 4 ; 8 ) is arranged on the first transfer drum ( 22 ) after the printing cylinder ( 1 ) as a special device. 5. Sheet-fed offset printing machine according to claim 1 or 2 and 4, characterized in that the transfer drums ( 21 ; 22 ; 23 ; 24 ) have closed surfaces when used as printing cylinders. 6. Sheet-fed offset printing machine according to claim 1 or 2, characterized in that a drying device ( 5 ) can be assigned as a special device to one of the transfer drums ( 21 ; 22 ; 23 ; 24 ). 7. Sheet-fed offset printing machine according to claim 1 or 2, characterized in that one of the transfer drums ( 21 ; 22 ; 23 ; 24 ) can be assigned a coating module. 8. Sheetfed offset printing machine according to claim 1 or 2 and 4, characterized in that one of the transfer drums ( 21 ; 22 ; 23 ; 24 ) can be assigned a cutting device ( 6 ).