EP1397253A1

EP1397253A1 - Printing unit

Info

Publication number: EP1397253A1
Application number: EP02704595A
Authority: EP
Inventors: Volker Gerold Rauh
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 2001-06-20
Filing date: 2002-01-17
Publication date: 2004-03-17
Also published as: DE10129762A1; US7040226B2; WO2003000496A1; US20040237817A1; DE10129762B4

Abstract

The invention relates to a printing unit containing at least one printing group (01; 31), which comprises at least two cylinders (03; 04) that form a printing nip (02). At least the two cylinders of the printing group are interconnected in a positive-fit by a drive. Said cylinders can be engaged with one another in a first position (ON), disengaged from one another in a second position (OFF) and disengaged from one another in a third position (STOP) at a great enough distance that a web (06) in the printing operation can be guided between the cylinders without making contact.

Description

description

printing unit

The invention relates to a printing unit according to the preamble of claims 1 or 6.

A printing unit is known from DE 44 30 693 A1, a double printing unit comprising two transfer cylinders forming a printing point and the associated forme cylinders being drivable by means of a common drive motor. A transfer cylinder can be placed in two positions by means of an eccentric bearing, in a pressure on and a pressure down position.

EP 08 62 999 A2 discloses a double printing unit, the two transfer cylinders forming a printing point with one another not being in drive connection with one another, but each having a drive motor together with the associated forme cylinder. In addition to the on and off position, the two transfer cylinders can be brought into a third position with respect to one another, in which a web can be carried out between the two transfer cylinders during printing operation.

From DE 44 01 289 A1 a device for adjusting cylinders is known, wherein in addition to a storage position of the cylinders, two different positions of the cylinders relative to one another can be set for different web thicknesses. For the adjustment, a support element having two different stops is provided for this.

DE 93 11 113 U1 shows a double printing unit, by means of which a printing material web can be carried out without contact in a position in which the print is switched off. Safe, contactless execution is achieved by guide rollers arranged directly before and after the pressure point. In DE 196 03 663 A1, a pressure point should be maintained as far as possible when the plate is being changed. This is achieved, inter alia, by a forme cylinder which can be driven independently of the associated transfer cylinder, the transfer cylinder continuing to act as an impression cylinder with the web during the plate change and being in drive connection with the impression cylinder.

US 5 265 529 A discloses cylinders which can be placed in three positions. The various end positions can be adjusted to specific paper thicknesses etc. with regard to the adjustment path by adjusting devices. The stops limit the queuing to the other cylinders.

A drive of a printing unit is known from DE 198 53 114 A1, the gear engagement in the drive being largely independent of the position of the interacting cylinders by means of the introduction of intermediate gear wheels in the drive train.

The invention has for its object to provide a printing unit.

The object is achieved by the features of claims 1 or 6.

The advantages that can be achieved with the invention are, in particular, that by means of three layers, a "regular" shutdown, for example when changing over the production, during standstill etc., but also a shutdown of the cylinders is made possible with a distance which, for. B. allows a contactless implementation of the web, for example, in printing operation through the printing nip.

A clearing with a relatively large distance between the cylinders allows contactless passage without additional guide rollers which prevent the web from "fluttering" or swinging. The latter could possibly impair the quality of fresh prints. If the cylinders of a printing group can be driven together by a drive system, which is maintained in each of the positions, a web can be released during printing operation with a small number of drive motors.

It is advantageous to be able to take an entire printing unit out of the printing, but the web still runs between the transfer cylinders. Through the continued engagement of the positive drive connection, the relative position of the cylinders to one another is maintained, and on the other hand, setup operation by means of a single drive motor in the case of one drive motor per printing unit with steel cylinder or double printing unit, and with only one auxiliary motor per double printing unit for the Case of a drive motor for two double printing units (e.g. printing tower, H printing unit, two bridge printing units) possible.

If two printing units are provided, each with its own drive motor, two printing units arranged one behind the other in the transport direction allow two-sided printing (1/1 + 1/1 = 2/2), simple double-sided printing with the first (1/1 + 0 / 0) or the second (0/0 + 1/1) printing unit alternately. With a corresponding design of a gear engagement in the position of the cylinder, in which the web is freely guided through the pressure nip, a setup operation, for. B. an operation with a flying plate change, alternating the first and the second printing unit possible.

The regulation of the drive of the printing unit and of a stop for blocking a release position under certain operating conditions or preventing it from starting in certain operating situations allow the release with a high level of safety for the transmission of the drive system and an operator, as well as a trouble-free production run.

There are three possible, defined positions for the transfer cylinder, the middle position or the relevant stop depending on the drive situation (speed, clutch condition) is either adopted or effective.

Embodiments of the invention are shown in the drawings and are described in more detail below.

Show it:

Figure 1 is a schematic representation of a printing unit in plan view.

Figure 2 is a schematic representation of a drive connection of a printing unit in side view.

Fig. 3 is a schematic representation of a mechanism for pivoting;

Fig. 4 is a schematic representation of a printing unit with two printing units;

FIG. 5 shows a schematic illustration of a drive connection of the printing unit according to FIG. 4 in a side view.

A printing unit of a printing press, in particular one

Web-fed rotary printing press, has a printing unit 01, between two cylinders 03; 04 a web 06, e.g. B. a paper web 04 is feasible (Fig. 1).

The two cylinders 03; 04 are in the example as a transfer cylinder 03; 04, especially as a blanket cylinder 03; 04, which each have a further cylinder 07; 08, e.g. B. a forme cylinder 07; 08, is assigned. Dyeing and dampening units, not shown, are provided. However, it can be one of the two cylinders 03; 04 as an impression cylinder which does not carry any ink 04; 03, e.g. B. as a satellite or steel cylinder.

The four cylinders 03; 04; 07; 08 of the printing unit 01, which is designed as a double printing unit 01, are rotatably mounted on the end side in a frame, not shown. Here, at least one of the two transfer cylinders 03; 04, e.g. B. the transfer cylinder 03, a bearing 09 (Fig. 3), which a relative change in position of the two transfer cylinders 03; 04 to each other, in particular a change Δa in a distance a between the two transfer cylinders 03; 04, allowed. In the illustrated embodiment, bearings 10 for the other cylinders 04; 07; 08 not specified in more detail and provided with the reference number 10 (FIG. 3).

In a variant shown in broken lines, the second transfer cylinder 04 also has a bearing 09 shown in broken lines that enables a change in position. The two bearings 09 are then coupled to one another, for example by means not shown, in such a way that when actuated they execute a synchronous, but opposite movement.

The transfer cylinder 03; 04 are in at least three different positions, ie distances a1; a2; a3, can be brought together, the transfer cylinders 03; 04 placed in a first position AN with a first distance a1 = 0, in a second position AB with a second distance a3>a2> 0, and in a third position OFF with a third distance a3 so far that the paper web 06 during printing, e.g. B. without touching the z. B. for setting up slower running or standing transfer cylinder 03; 04, can be passed through the pressure gap 02. A standstill of the paper web 06 or drawing in is also possible, while the cylinders 03; 04; 07; 08 a set-up shop (washing, pre-inking, printing form change, blanket change, images of the forme cylinder 07; 08) are accessible. In the second layer AB are the two Transfer cylinder 03; 04 switched off from each other, the retracted web 06 can, however, in contact with at least one of the adjustable cylinders 03; 04, for example, to maintain leadership or not. In addition, a significantly smaller travel range is required.

The four cylinders 03; 04; 07; 08 are in the exemplary embodiment by means of pins 11; 12; 13; 14 arranged gears 16; 17; 18; 19 with each other in a positive drive connection. Both the geometry of the gears 16; 17; 18; 19 and the bearing (s) 09 are designed such that the drive connection in each of the three layers AN; FROM; Is received. The cylinders 03; 04; 07; 08 are via a gear 21, z. B. a gear 21 or a pinion 21 of a drive motor 22 which with one of the gears 16; 17; 18; 19 the cylinder 03; 04, 07; 08, here the gear 16 of the forme cylinder 07, meshes, driven. The drive by means of the drive motor 22 can, however, also directly and coaxially on one of the cylinders 03; 04; 07; 08 or pin 11; 12; 13; 14 done.

In the exemplary embodiment, the three layers AN; FROM; OFF by means of the eccentric bearing 09, z. B. as a three-ring or four-ring bearing, preferably because of less effort, but as a three-ring bearing, executed bearing 09 for the transfer cylinder 03 allows. This is done by pivoting an axis of rotation R of the transfer cylinder 03 about a pivot axis S of the bearing 09. The possible additional eccentric bearing 09 for the second transfer cylinder 04 is shown in broken lines, possible eccentric bearings for the forme cylinders 07; 08, for example for the purpose of an additional on or off movement, are not taken into account in the figures. The pin 11; 13; 14 of the remaining cylinders 04; 07; 08 are shown centrally in FIG. 3 by way of example in the bearings 10 by means of a solid line.

If one of the two cylinders 03; 04 as cylinder not carrying ink 04; 03 executed, either the transfer cylinder 03; 04, or the other cylinder 04; 03 or both can be supported by means of an eccentric bearing 09.

In Fig. 1, the two transfer cylinders 03; 04 in the third position AUS with the distance a = a3 (e.g. 5 mm ≤ a3 ≤ 10 mm, in particular a3 ~ 8 mm) so that the paper web 06 can pass the printing gap 02 without touching it. The gears 17; 18, which is not discernible in the schematic representation of FIG. 1, are just still engaged with one another according to the representation in FIG. 2. By pivoting the eccentric bearing 09 about a pivot axis S, an axis of rotation R of the transfer cylinder 03 or its pin 17 can be moved into the three positions AN; FROM; Bring OFF (marked by the crosses in Fig. 2).

Fig. 3 shows an example of the drive for changing the position of an arrangement according to the aforementioned principle. It shows the pin 12 of the transfer cylinder 03 in the first position AN, i. H. the transfer cylinders 03 not visible in FIG. 3; 04 are working together. The eccentric bearing 09 can be pivoted, for example, by pivoting a lever 23 via a coupling 24 within a bushing (not shown) with a circular cross section. A pivoting of the lever 23 clockwise causes, for example, a pivoting of the eccentric bearing 09 also clockwise and thus a movement of the pin 12 away from the bearing of the second transfer cylinder 04, i. H. a change to the AB position or, in the event of further pivoting, to the OFF position. By means of a second coupling 25 shown in broken lines, in the event of an eccentric mounting of the second transfer cylinder 04, it can be moved synchronously and in opposite directions.

The coupling 24 is driven here by means of a one-armed lever 23, the free end of which is operatively connected to a threaded spindle 27 rotatable by a motor 26. Rotating the threaded spindle 27 in one direction or the other causes the lever 23 to pivot, and thus the eccentric bearing 09 to pivot one way or the other. However, the eccentric bearing 09 could also be driven via a cylinder which can be pressurized with pressure medium, or also by means of a drive which interacts directly with the bearing 09.

If the transfer cylinder 03 is or the transfer cylinder 03; 04 in its first position ON, the transfer cylinder 03 can be pivoted into the second position AB by pivoting the lever 23 accordingly, but the pivoting into the third position OFF can be blocked. The stroke of the cylinder 03; 04 or the distance a between the cylinders 03; 04 can either be limited in the AB position or extended up to the AUS position by means of a position-adjustable or pivotable stop 28.

In the exemplary embodiment, this is done by means of an adjusting means 30, for. B. a pressurized cylinder 30, the stop 28, z. B. a free end of another one-armed lever 28 can be positioned in the range of motion of the free end of the lever 23. In this position, this lever 28 advantageously acts in “normal” printing operation, ie alternating the first two positions AN; AB also as a stop for the defined position AB , since positioning in an “intermediate layer” by means of pressure media alone is practically not possible.

The setting means 30 can be controlled by a control device 29 (only in FIG. 5) in such a way that a change from the first or second position AN; AB in the third position OFF is prevented at least then by the stop 28, as long as the printing unit 01 or the transfer cylinder 03; 04 is operated above a determinable limit speed or at production speed. The stop 28 is only released up to the OFF position as soon as the printing unit 01 is shut down, or is operated at a speed below a limit or in set-up mode, ie a speed asynchronous to the production speed. In an advantageous embodiment, at least the third position AUS can be determined by means of a signal transmitter (not shown), for example a limit switch, the signal likewise being fed to the control device 29.

If the printing unit 01 can be driven independently of another printing unit by means of its own drive motor 22, then for example the angular velocity or speed of the drive motor 22 or one of the cylinders 03; 04; 07; 08 or the peripheral speed on the transfer cylinder 03 is determined and fed to the control device 29, in which the comparison with the present operating state is then carried out. For example, If, for example, the condition exists that the printing group 01 is operated in production readiness or one that is above a limit value, the stop 28 is brought into an effective position in which a change in position in the third position OFF is blocked.

On the other hand, in order to protect the drive connection and the operating personnel, it is advantageous if the printing unit 01 is in the OFF position only in certain operating modes, e.g. B. in setup, d. H. can be operated at limited speeds. For this, too, a maximum speed can be specified, for example, which can correspond to the limit speed for the change from position AB to position OFF. This can be predetermined via the control device 29 for controlling the drive motor 22. An acceleration independent of the running of the paper web 06 to a speed which is synchronous with the printing operation can in this case only be in a position located between the positions OFF and ON and limited by the stop 28 to the position OFF, e.g. B. AB location. This limitation is preferably via the electronics, i. H. for example via the control device 29.

The control device 29 also prevents a change from the OFF position or from the AB position to the ON position when the printing press is in operation, ie the Paper web 06 passes through printing nip 02, printing unit 01 does not have a speed which is synchronous with the running of paper web 06, or printing unit 01 is not in drive connection with drive motor 22.

The device described and the operating situations are also applicable to printing units 01, the cylinders 03; 04 (possibly also a satellite cylinder) form a drive system which is driven by the forme cylinders 07; 08 is independent and driven by its own drive motor. For example, the two transfer cylinders 03; 04 in a rubber-to-rubber printing unit by a drive motor and the two forme cylinders 07; 08 driven by one or two additional drive motors (which are suitable for production operations).

This also applies if one or more transfer cylinders 03; 04 together with a satellite cylinder and the associated forme cylinders 07; 08 are specially driven.

In a further exemplary embodiment, the printing unit 01 can also be provided with a second printing unit 31 with the gear wheels 32; 33; 34; 36 of two further transfer cylinders and two further forme cylinders can be driven together by a common drive motor 37 (only the gear wheels 32; 33; 34; 36 of the cylinders of the second printing unit 31 are shown in FIG. 4). In this case, it is advantageous if the drive from the drive motor 37 via a gear 38; 39 to printing unit 01; 31 out. At least one of the gears 38; 39 is by means of a clutch 41; 42 (see FIG. 5) in the gear 16 of the first printing unit 01 or in the gear 32 of a forme cylinder 43 of the second printing unit 31 can be optionally engaged or disengaged. This can be done, for example, by means of gear wheels 38; 39 done. The information about an open clutch state of the clutch 41; 42 is fed to the control device 29, for example via limit switches (not shown), whereupon the pivoting for the assigned transfer cylinder into the position AN is prevented via the control device 29. Does the printing unit 01; 31 synchronous to production and / or with clutch 41 coupled; 42, the change to the OFF position is blocked via the actuating means 30 and the stop 28 (see FIG. 3). To control the adjusting means 30, the one on the printing unit 01; 31 or the rotational speed present on the transfer cylinder 03 and processed in the control device 29.

4 and 5 show a printing unit designed as an H printing unit, the lower printing unit 31 being disengaged and the pivotable transfer cylinder assigned to the gear 33 being in the third position OFF, while the upper printing unit 01 is engaged and the transfer cylinder is in engagement 03 is in the first position AN.

In an embodiment variant, not shown, one of the two gear wheels 38; 39 also as a non-detachable double gear 38; 39 be executed, one half with the gear 16; 32 of the forme cylinder 07; 43, and the other half meshes with the gear 21 of the drive motor 37. The halves can be used in an advantageous embodiment for registration, z. B. between the two printing units 01; 31 or other units of the printing press, can be rotated relative to one another.

In all cases in which two printing units 01; 31 can be driven by means of a common drive motor 37, it is advantageous in the drive connection of a decoupling printing unit 01; 31 for the purpose of setting up an auxiliary drive, not shown.

The printing unit works as follows:

The printing unit 01; 31 of the printing unit, like conventional double printing units in the "Normal" printing operation can optionally be operated in a position AN and AB. In addition, however, it is possible to guide the paper web 06 through the printing unit 01; 31 during printing operation, while this printing unit 01; 31 is not involved in the printing, ie is inactive. For this purpose, the printing unit 01; 31 or its transfer cylinder 03; 04 is pivoted into the OFF position, as long as the printing unit 01; 31 is operated at a speed that is above a limit speed and / or an arranged between the drive motor 37 and the printing unit 01; 31 Clutch 41; 42 is closed, the change to this third position OFF is mechanically blocked.

If the drive of the printing group 01; 31 is no longer operated synchronously with the running of the paper web 06 or at a speed below the limit speed, the control device 29 then pivots the transfer cylinder 03; 04 released in the OFF position by bringing the stop 28 into the inactive position. This can be done either when the printing unit 01; 31 driving drive motor 22 or the printing unit 01; 31 is no longer in sync with paper web 06, but is driven in setup mode or is at a standstill. If the printing unit 01; 31 from a common drive motor 37 via a switchable clutch 41; 42 driven, the release takes place, for example, due to the open clutch state of the clutch 41; 42nd

For the purpose of acceleration to printing speed or printing speed, printing unit 01; 31 first from the OFF position to an intermediate position, e.g. B. able to bring AB. Only when the peripheral speed or the corresponding speed corresponds to that of the paper web 06 is the printing unit 01; 31 can be brought back to the ON position.

When forming the printing unit with two printing units 01; 31, the printing unit can be used for 2/2 printing or alternating 1/1 printing, for example for the purpose of changing plates on the fly. For this purpose, one of the printing units 01; 31 in the Position brought ON while the other printing unit 31; 01 is brought into the OFF position. Setup, e.g. B. a plate change is now possible.

In an advantageous embodiment, the printing unit 31; 01 first again in the intermediate layer, e.g. B. able to bring AB before the printing unit 31; 01 can be accelerated again. Is the speed of the printing unit 31; 01 synchronized again to the web run, ie again accelerated and possibly coupled in, the blocking for the pivoting into the ON position is released, and the printing unit 31; 01 can be returned to the ON position. Now the first printing unit 01; 31 can be brought into the OFF position for setting up as soon as the speed is below the limit speed or the relevant clutch 42; 41 is solved.

LIST OF REFERENCE NUMBERS

01 printing unit, double printing unit

02 pressure gap

03 cylinders, transfer cylinders, blanket cylinders, impression cylinders

04 cylinder transfer cylinder, blanket cylinder, impression cylinder

05 -

06 web, paper web

07 cylinders, form cylinders

08 cylinders, form cylinders

09 bearings, eccentric

10 bearings

11 pins (07)

12 pins (03)

13 pins (04)

14 pins (08)

15 -

16 gear (07)

17 gear (03)

18 gear (04)

19 gear (08)

20 -

21 gear, gear, pinion

22 drive motor

23 levers

24 paddocks

25 paddocks

26 engine

27 threaded spindle 28 stop, lever

29 control device

30 actuators, cylinders

31 printing unit

32 gear (31)

33 gear (31)

34 gear (31)

35 -

36 gear (31)

37 drive motor

38 gear, double gear

39 gear, double gear

40 -

41 clutch (01)

42 clutch (31)

43 forme cylinder (31)

R axis of rotation (03)

S swivel axis (09)

a distance

ON first position, employed

AB second layer, turned off

OFF third layer

Claims

Expectations

1. Printing unit with at least one printing unit (01; 31) which has a cylinder (03; 04) which is designed as a transfer cylinder (03; 04) and can be driven by means of a drive motor (22; 37) and which is in a first position (AN) and can be set in a different position (AUS), characterized in that a position-adjustable stop (28) is provided which optionally adjusts the travel of the cylinder (03; 04) in a position between the first and the further, third position (AN; AUS) located second layer (AB) limited.

2. Printing unit according to claim 1, characterized in that the cylinder (03; 04) with a second cylinder (03; 04) forms a pressure gap (02) for a web (06) guided through the pressure gap (02) and at least one of the two cylinders (03; 04) can be brought into the three positions (ON; DOWN; OFF).

3. Printing unit according to claim 2, characterized in that the two cylinders (03; 04) in the first position (AN) placed against each other, in the second position (AB) one of the adjustable cylinders (03; 04) in contact with the web (06) stands, however, the two cylinders (04; 03) are set apart from each other, and in the third position (AUS) can be set apart from each other to such an extent that a web (06) can be passed between them without contact during printing.

4. Printing unit according to claim 2, characterized in that the two cylinders (03; 04) of the printing unit (01; 31) are in positive connection with each other and can be driven by a common drive motor (22; 37).

5. Printing unit according to claim 2, characterized in that a storage path for a distance (a) of the cylinders (03; 04) depending on an operating situation of the drive for the printing unit (01; 31) optionally in the second position (AB) larger distances (a) is limited.

6. Printing unit with at least one printing unit (01; 31), which has at least two cylinders (03; 04) forming a printing gap (02) with one another, the two cylinders (03; 04) of the printing unit (01; 31) being interlocking with one another Stand drive connection and can be driven by a common drive motor (22; 37), and wherein the two cylinders (03; 04) in a first position (AN) are placed against each other and in a different position (OFF) different from each other, characterized that a parking path for a distance (a) of the cylinders (03; 04) depending on an operating situation of the drive for the printing unit (01; 31) optionally in a position between the first and the further, third position (ON; OFF) second layer (AB) is limited to larger distances (a).

7. Printing unit according to claim 6, characterized in that the two cylinders (03; 04) in the third position (AUS) can be set apart from each other to such an extent that a web (06) can be passed between them in a contactless manner during printing operation.

8. Printing unit according to claim 1 or 6, characterized in that two such printing units (01; 31) in the transport direction of the web (06) are arranged one behind the other.

9. Printing unit according to claim 4 or 6, characterized in that the positive drive connection between the two cylinders (03; 04) of the printing unit (01; 31) is maintained in each of the three positions (AN; AB; AUS).

10. Printing unit according to claim 2 or 6, characterized in that the two cylinders (03; 04) forming the printing gap (02) are designed as transfer cylinders (03; 04), each of which a forme cylinder (07; 08; 43) is assigned ,

11. Printing unit according to claim 10, characterized in that all four cylinders (03; 04; 07; 08; 43) of the printing unit (01; 31) are in positive drive connection with each other and can be driven by a common drive motor (22; 37) from one of the forme cylinders (07; 08; 43).

12. Printing unit according to claim 1 or 6, characterized in that a change from the second position (AB) to the third position (AUS) can be optionally blocked.

13. Printing unit according to claim 4 or 6, characterized in that a position-adjustable stop (28) is provided for the purpose of optionally blocking or limiting.

14. Printing unit according to claim 1 or 13, characterized in that the removal of the blocking or the removal of the limitation of the parking path as a result of an interruption of a coupling (41; 42) arranged between the printing unit (01; 31) and drive motor (22; 37). is feasible.

15. A printing unit according to claim 1 or 13, characterized in that the blocking can be removed or the limitation of the parking path can be lifted as a result of a speed of the printing unit (01; 31) below a limit speed.

16. Printing unit according to claim 1 or 6, characterized in that in the third position (AUS) between the cylinder (03; 04) of the printing unit (01; 31) and the drive motor (22; 37) arranged clutch (41; 42 ) resolved, and a connection is blocked.

17. Printing unit according to claim 1 or 6, characterized in that in the third position (OFF) operation of the cylinder (03; 04) is blocked at speeds above a predetermined maximum speed.

18. Printing unit according to claim 1 or 6, characterized in that the cylinder (03; 04) in the third position (AUS) can only be operated at a standstill or in predefined and permissible operating modes.

19. Printing unit according to claim 1 or 6, characterized in that a change from the second position (AB) to the first position (AN) is blocked.

20. Printing unit according to claim 19, characterized in that the change from the second position (AB) to the first position (AN) due to an interruption of a coupling (41; 37) arranged between the printing unit (01; 31) and the drive motor (22; 37). 42) can be blocked.

21. Printing unit according to claim 19, characterized in that the change from the second position (AB) to the first position (AN) due to a peripheral speed or speed of the printing unit (01; 31) which is different from the running of the web (06) can be blocked ,

22. Printing unit according to claim 1 or 6, characterized in that a signal transmitter is provided for determining the third position (OFF).

23. Printing unit according to claim 8, characterized in that the two printing units (01; 31) have no positive drive connection with each other and can each be driven by means of their own drive motor (22).

24. Printing unit according to claim 8, characterized in that the two printing units (01; 31) are in positive connection with each other and can be driven by means of a common drive motor (37).

25. Printing unit according to claim 24, characterized in that at least one of the printing units (01; 31) optionally by means of a switchable clutch (41; 42) from Drive motor (37) is separable or can be connected to the drive motor (37).

26. Printing unit according to claim 2 or 6, characterized in that at least one of the cylinders (03; 04) by means of eccentric bearings (09) by pivoting the bearing (09) about a pivot axis (S) into the different positions (AN; AB; OFF) can be brought.

27. Printing unit according to claim 26, characterized in that the eccentric bearing (09) is adjustable by means of a motor (26).

28. Printing unit according to claim 26, characterized in that the eccentric bearing (09) can be adjusted by means of a cylinder which can be acted upon by pressure medium.

29. Printing unit according to claim 1 or 13, characterized in that the stop (28) can be adjusted by means of a cylinder (30) which can be pressurized with pressure medium.