EP2406077B1 - Press unit of a press having at least one printing unit - Google Patents

Description

The invention relates to a printing unit of a printing machine with at least one printing unit according to the preamble of claim 1.

By the EP 1 930 161 A2 an inking unit of a printing unit of a sheet-fed printing machine is known in which a plurality of inking rollers are driven directly and jointly by a central drive wheel, but a further inking roller is not driven directly from the central drive wheel.

By the DE 195 20 841 A1 a printing unit of a printing machine with at least one printing unit is known, wherein the printing unit has at least one forme cylinder and a cooperating with this form cylinder transfer cylinder and an inking unit with a plurality of Reibzylindern, wherein the form cylinder and / or the transfer cylinder and all the distribution cylinder of this printing unit of a same drive motor rotative are driven, wherein the distribution cylinders are driven by the drive motor by means of a gear having a plurality of gears, the distribution cylinders each having a spur gear, wherein a plurality of distribution cylinders of this printing unit each driven directly and jointly by an engagement of their respective spur gear in a rotatable about a rotation axis central gear are.

By the DE 197 53 931 A1 a printing unit of an offset rotary printing press with two printing units is known, each of these printing units each having a forme cylinder and cooperating with this form cylinder transfer cylinder, the transfer cylinders of these printing units are employed against each other, each of the two printing units each having an inking unit with three Reibzylindern, wherein the distribution cylinders each have a spur gear on their spigots, wherein the respective spur gears of the distribution cylinders of the same inking unit are in meshing engagement directly with a same central gear, wherein the respective central gear in printing operation in each case via at least one intermediate gear with a motor driving at least one of the forme cylinder is in a drive connection, wherein the respective intermediate wheel can be disengaged by an axial displacement of the drive connection to the forme cylinder of the respective printing unit, wherein the spur gears of the same Reibzylinder same inking unit also after disengaging the intermediate gear from the drive connection to the respective form cylinder continues with their respective central Gear remain engaged.

By the WO 02/076744 A1 is a drive of a printing unit with a cylinder designed as a first cylinder known, wherein a cooperating with the forme cylinder second cylinder and the forme cylinder associated inking unit are provided, wherein the drive of the two cylinders takes place on the forme cylinder, from which via a drive connection to the the second cylinder is driven off, wherein the inking unit is driven via a drive connection from the second cylinder, wherein the Form cylinder preferably mechanically independent of the drive of another printing unit by a drive motor is driven, wherein the forme cylinder associated inking unit is driven by the same drive motor and wherein the drive connection between the second cylinder and the forme cylinder is designed as a gear train.

By the DE 10 2006 035 713 A1 an inking unit drive in a processing machine for substrates with a plurality of inking rollers having inking unit is known, wherein a drive from a printing press cylinder on a central inking drive is fed and from this an output on the rotatably and axially iridescent drifting inking rollers can be realized, the Farbwerksantriebsrad freely rotating on a frame-mounted gear shaft is arranged, wherein the inking drive gear adjacent to the transmission shaft, a clutch is arranged fixed, which is coupled in the engaged switching state with the Farbwerksantriebsrad for transmitting a moment and decoupled in the disengaged switching state of the Farbwerksantriebsrad, and wherein on the transmission shaft an inking gear is arranged fixed, from which in the engaged switching state of the clutch, the output to the inking rollers is feasible.

By the DE 10 2006 036 511 A1 a drive for an offset printing machine is known, wherein in a gear train of this drive, a displaceable gear is provided, with this displaceable gear, a force flow from a rotatably mounted on a shaft of a plate cylinder gear to a rotatable roller of an inking unit can be produced.

By the CH 439 338 A is an inking unit for in two directions to be operated printing units of rotary printing machines known, being disengaged intermediate wheels in the inking unit drive.

By the DE 24 58 772 A1 a rotary printing machine with an inking unit is known, wherein the inking unit is driven during operation by the machine drive and for washing by an auxiliary motor, wherein the two drives are separable from each other by a coupling on the plate cylinder shaft, wherein the drive wheel of the plate cylinder consists of two spur gears, which are connectable by an electromagnetic gear coupling, wherein the gear with the Gummizylinderantriebsrad engaged gear loosely on the plate cylinder shaft and the inking wheels driving gear rotatably disposed on the plate cylinder shaft.

The invention has for its object to provide a printing unit of a printing machine with at least one printing unit, which has a cost-producible drive train, said drive train can be arranged in a space of low overall height.

The object is achieved by the features of claim 1.

The achievable with the invention advantages are, in particular, that the printing unit of the printing unit is extremely compact and has a cost-effectively producible drive train. The transmission of the drive train requires only a small number of gears, as a very short gear train is formed. The fact that the drive motor transmits its torque over a small number of gears, the efficiency of this transmission is relatively high. Since the drive train emanating from the drive motor ends at the spur wheels of the distribution cylinders, no further expansive gears are provided for this drive train. The transmission of the drive train is thereby realized in a space with a height that occupies less than 80%, preferably less than 60% of a height of the entire printing unit. The compact construction of the printing mechanism in the and / or space obtained on the frame of the printing unit can be used advantageously for the arrangement of other machine components required in the printing unit, ie in particular units and / or control elements and / or line installations, whereby a novel concept is made possible for the construction and design of this printing unit.

An embodiment of the invention is illustrated in the drawings and will be described in more detail below.

Fig. 1

ein Walzenschema einer Druckeinheit mit zwei Druckwerken;

Fig. 2

schematisch ein Getriebe von einem der in der Fig. 1 gezeigten Druckwerke;

Fig. 3

eine perspektivische Darstellung eines Ausschnitts aus dem Getriebe der Fig. 2.

Show it:

Fig. 1

a roller diagram of a printing unit with two printing units;

Fig. 2

schematically a transmission of one of the in the Fig. 1 shown printing units;

Fig. 3

a perspective view of a section of the transmission of Fig. 2 ,

Fig. 1 shows by way of example a roller diagram of a printing unit 01 of a preferably used in commercial printing offset rotary printing machine with several, in particular two in a same frame 02 z. B. vertically stacked printing units 03, each of these printing units 03 each having a forme cylinder 04 and cooperating with this form cylinder 04 transfer cylinder 06, wherein the transfer cylinder 06 of these printing units 03 are employed against each other at least in the printing operation of this printing unit 01, wherein a in the Fig. 1 dashed line indicated substrate 07, z. B. a printing substrate 07, in particular a paper web 07, is guided substantially horizontally through this printing unit 01 in a transport direction T between the mutually employed transfer cylinders 06 therethrough. The forme cylinder 04 is covered on its lateral surface with at least one pressure mold which preferably circumferentially surrounds it. On the lateral surface of the Transfer cylinder 06 is at least one blanket, z. B. a metal blanket spanned.

Each of the two essentially identical executed, z. B. to the course of the printing substrate 07 mirrored trained printing units 03 each have an inking unit 08 with several, in particular three Reibzylindern 09, wherein at one of these Reibzylinder 09 from a belonging to the respective inking unit 08 ink reservoir 11 in a color flow zoomed ink into a main color stream and is divided into a paint side stream, wherein both the main color stream and the ink side stream over each only a single ink transfer roller 12 each a different z. B. two further to the respective inking unit 08 belonging distribution cylinder 09 are fed. In the preferred embodiment, the color flow approached by the ink reservoir 11 is accordingly fed to the middle of the three preferably in a circular arc, in particular arranged in a semicircle distribution cylinder 09, wherein the respective centers of the distribution cylinder 09 in this circular arc z. B. offset by approximately or at least 90 ° to each other

The color reservoir 11 is z. B. as a color box 11 with several, z. B. more than twenty transverse to the transport direction T of the substrate 07 juxtaposed ink zones formed, in each color zone a controllable Farbdosierelement 13, in particular for dispensing of the ink reservoir 11 ink quantity adjustable ink meter 13 is provided, wherein in the ink reservoir 11 stockpiled ink in recorded in the respective inking zone of the respective ink metering 13 set by means of a rotatable ink ductor 14 and z. B. a color ink duct 14 adjacent arranged ink film roller 16 is supplied. The ink fountain roller 16 forwards ink received by the ink fountain roller 14 via only a single ink transfer roller 17 to that distribution cylinder 09 which divides the ink stream received from the ink reservoir 11 into the aforementioned main color flow and secondary ink flow. The ink fountain 11 is z. B. by an actuation of at least one lever 26 to the respective rotatable, but in the frame 02 positionally mounted ink ductor 14 swiveled or swung from this, which two operating positions of the respective ink fountain 11 in the Fig. 1 are indicated.

Both disposed in the main color flow cylinder 09 and arranged in the ink flow tribo cylinder 09 receive ink received from the respective ink transfer roller 12 each via two inking rollers 18 to the respective plate cylinder 04, either in the main color stream or in the ink side stream one of the two inking rollers 18 at the same time as a dampening roller can be used, if the relevant printing unit 03 with a dampening unit 19, z. B. a film dampening unit 19, in particular a three-roll film dampening unit 19, is equipped.

The three distribution cylinders 09 of the respective inking unit 08 preferably have a lateral surface made of a plastic, in particular of Rilsan. The respective lateral surface both of the arranged between the Reibzylindern 09 ink transfer rollers 12 and all the inking rollers 18 is respectively gummed, ie executed by an elastomeric material. The ink film roller 16 preferably again has a lateral surface made of Rilsan, wherein this lateral surface z. B. is formed in a rhombic structure. The ink film roller 16 is pivotally mounted on both sides in the frame 02 preferably on levers. The ink fountain roller 14 has a lateral surface z. B. from a ceramic. Between the ink fountain roller 14 and the ink fountain roller 16, a width variably adjustable gap is formed, and a preferable width of this gap is 0.08 mm. If a three-roller dampening unit 19 is provided, the middle roller z. B. formed as a preferably non-iridescent dampening 21 with a lateral surface made of chromium, which transmits one of a dampening duct 22 from a dampening solution reservoir 23 dampening solution to the inking roller used as a dampening roller 18.

In the preferred embodiment of the respective inking unit 08 are all of its inking rollers 18 and ink transfer rollers 12; 17 and the ink film roller 16 each friction-driven. The ink fountain roller 14 is independently driven by a preferably electric drive motor 27 rotationally. The dampening drive 21 of the dampening unit 19 is also driven by a preferably electric drive motor 28, whereby this drive motor 28 preferably also drives the dampening duct 22 via a gear transmission with a speed that is comparatively lower to the dampening drive 21.

Each of the two arranged in the same printing unit 01 printing units 03 has for its respective form cylinder 04 own, independent of the respective other printing unit 03, preferably electric drive motor 29, said drive motor 29 preferably in terms of speed and angular position of one with a virtual master at least data technology related electronic drive controller. Both printing units 03 are thus driven individually and separately from each other.

For one of the printing units 03 is the associated, from the respective drive motor 29 outgoing drive train in the Fig. 2 exemplified. A provided by the respective drive motor 29 torque is preferably without a clutch via a rotationally fixedly connected to the rotation axis 31 of this drive motor 29 pinion 32 directly and directly z. B. on a rotation with the axis 33 of the forme cylinder 04 rotatably connected gear 34, whereby this forme cylinder 04 is rotatably driven in particular according to specifications of the master axis or at least driven. In order to drive the cooperating with this forme cylinder 04 transfer cylinder 06 rotatably meshes with the rotation axis 37 of this transfer cylinder 06 rotatably connected gear 36 with the rotation axis 33 of the forme cylinder 04 rotatably connected gear 34. A against the transfer cylinder 06 of this printing unit 03 employee or at least engageable transfer cylinder 06 of the other printing unit 03 of this printing unit 01, which for the in the Fig. 2 drivingly represented printing unit acts as the impression cylinder, is not involved in the drive train of the first-mentioned printing unit 03, but completely separated from this drive. The rotatably connected to the rotation axis 31 of the drive motor 29 pinion 32, the rotation axis 33 of the forme cylinder 04 rotatably connected gear 34 and the rotational axis 37 of the associated transfer cylinder 06 rotatably connected gear 36 are substantially in a same orthogonal to these parallel to each other spaced rotation axes 31; 33; 37 arranged, preferably arranged vertically standing first plane E1. Alternatively, it is also possible to directly and directly drive the transfer cylinder 06 and then include the associated forme cylinder 04 in the outgoing from the drive motor 29 power flow.

On the rotation axis 37 of the transfer cylinder 06 of the former, in the Fig. 2 Preferably illustrated second printing unit 03 is preferably rotatably disposed a second gear 38, wherein this second gear 38 with a preferably on the axis of rotation 33 of the forme cylinder 04 at least freely rotatably mounted gear 39 is in meshing engagement. Alternatively, these two arranged on the rotation axis 37 of the same transfer cylinder 06 gears 36; 38 in a single unit by a z. B. double-width gear or be formed by a so-called double wheel.

The on the rotational axis 33 of the forme cylinder 04 at least freely rotatable, preferably additionally axially slidably mounted on the axis of rotation 33 of the forme cylinder gear 39 is directly and directly with a centrally arranged in the inking unit 08, rotatably connected to a rotation axis 47 connected gear 41 in meshing , wherein this centrally arranged in the inking unit 08 gear 41 is in a preferably permanent meshing with at least one spur gear 42, ie with a cylindrical gear 42 with a toothing on the circumference, which spur gear 42 with the rotation axis 43 of one of z. B. three distribution cylinder 09 of the respective inking unit 08 is rotatably connected. The rotatably arranged on the axis of rotation 37 of the transfer cylinder 06 second gear 38, the at least freely rotatably mounted gear 39 and the centrally arranged in the inking unit 08 gear 41 are substantially in the same orthogonal to the said, parallel to each other on the axis of rotation 33 of the forme cylinder 04 spaced rotation axes 37; 33; 47 arranged, also preferably vertically standing second plane arranged E2, said second plane E2 is different from the first plane described above E1. Both levels E1; E2 are parallel to each other.

In the preferred embodiment, the respective spur gears 42 of all three friction cylinders 09 of the respective inking unit 08 directly and directly with the centrally arranged in the inking unit 08 gear 41, all of these spur gears 42 in a preferably permanent meshing with the centrally arranged in the inking unit 08 gear 41 are located. The spur gears 42 of the distribution cylinders 09 are therefore arranged like planet wheels around the centrally arranged in the inking unit 08 gear 41 around. The centrally disposed in the inking unit 08 gear 41 is formed as a single wheel, d. H. on the axis of rotation 47 are in the different, orthogonal to the axis of rotation 47 parallel planes E1; E2 does not have two or more gears arranged.

The drive train issuing from the drive motor 29 of this printing unit 03 ends at the spur gears 42 of the distribution cylinders 09, so that further rotation bodies, ie rollers and / or cylinders of the relevant printing unit 03, are not drivingly integrated into this drive train. The powertrain is as related to the Fig. 2 described, preferably as a gear 44, in particular as a gear transmission 44, in which all cooperating gears 32; 34; 36; 38; 39; 41; 42 are straight toothed, ie their teeth are each formed axially parallel. As in the gear train of the transmission 44 in addition to the straight toothed Gears 32; 34; 36; 38; 39; 41; 42 or in their place no helical gears are used, this gear 44 has no tooth crack, which is why an axial displacement of certain gears 39; 41; 42 can be realized in a simple manner, wherein the gear 39 to be displaced; 41; 42 with at least one other gear 38; 39; 41; 42 can remain in meshing. The respective rotation axes 31; 33; 37; 43; 47 of all in this gear 44 cooperating gears 32; 34; 36; 38; 39; 41; 42 are arranged parallel to each other. Both the use of spur gears and their spur toothing contribute to the fact that this gear 44 is inexpensive to produce. The gear train of the transmission 44 is in the Fig. 1 indicated by dash-dotted circular lines. The forme cylinder 04 is mounted for adjusting a side register in the frame 02 preferably axially displaceable about a travel ΔS, wherein this travel ΔS z. B. is in the range between 1 mm and 5 mm. It can be provided that the freely rotatably mounted on the rotational axis 33 of the forme cylinder 04 gear 39 is laterally moved about this axial travel .DELTA.S and thus arranged fixed in position on the axis of rotation 33 of the forme cylinder 04. In order to retain the transfer cylinder 06 of the printing unit 03 in a defined angular position relative to the forme cylinder 04 which cooperates with it, the transfer cylinder 06 is integrated in the drive train formed by the gear 44 and the associated power flow. In this printing unit 03 is a circumferential register of the forme cylinder 04 by means of acting on this form cylinder 04 drive motor 29 by the z. B. made by a belonging to the printing unit 01 control center from setting a certain angular position of this forme cylinder 04 adjustable. To set the circumferential register is therefore in the gear train of the transmission 44, a helical toothing of at least one pair of cooperating gears 32; 34; 36; 38; 39; 41; 42 not required. Rather, the preferably continuous spur toothing of the gears 32; 34; 36; 38; 39; 41; 42 of this transmission 44 a simple manner executable adjustment of the side register of the forme cylinder 04, because in direct contact cooperating gears 32; 34; 36; 38; 39; 41; 42 of the transmission 44 without Reaction on the circumferential register of the forme cylinder 04 can each be axially displaced relative to one another and thus axially parallel to one another.

The centrally arranged in the inking unit 08 gear 41 is preferably formed as a single Kuppelrad 41, which along its axis of rotation 47 by a controllable, z. B. pneumatic actuator 46, z. B. a pneumatic cylinder 46 to a travel ΔL linearly displaceable, whereby this coupling wheel 41 can be engaged in a power flow of the transmission 44 and / or auskuppelbar from this. The actuator 46 is z. B. from the control unit belonging to the printing unit 01 controllable. Regardless of the displacement of the central gear 41, that is, regardless of its operating position, selbiges remains with the respective spur gear 42 each Reibzylinders 09 each permanently in a tooth engagement. In the Fig. 2 both operating positions of the central gear 41 are shown, wherein the operating position of the disengaged from the power flow of the transmission 44 central gear 41 is shown by dashed lines. The formation of the centrally arranged in the inking unit 08 gear 41 as a single sprocket exhibiting single wheel is naturally cheaper than its formation as a double wheel with two on the same axis of rotation 47 offset from each other arranged sprockets.

Due to the fact that on the one hand only a few gears 32; 34; 36; 38; 39; 41; 42 are installed in the transmission 44 and on the other hand, the central gear 41 is in its engaged in the power flow of the transmission 44 operating state directly with a mounted on the axis of rotation 33 of the forme cylinder 04 gear 39 in meshing, this gear 44 has a space with a height H2 of less than 80%, in particular of less than 60% of a height H1 of the printing unit 03, wherein the height H1 of the printing unit 03 at the in the Fig. 1 exemplified printing unit 01 is approximately half the frame height. This small space of the transmission 44 in turn contributes to the fact that a very compact pressure unit 01 can be realized, because it is in and / or on the frame 02 of the printing unit 01 place obtained, which can be used advantageously for the arrangement of other required in this printing unit 01 units and / or controls and / or line installations, in particular electrical and / or pneumatic lines. Thus, in particular, the drive motor 27 of the ink fountain roller 14 is disposed outside the installation space of the transmission 44. The drive motor 28 of the dampening unit 19, ie in particular a pinion connected to a rotation axis of this drive motor 28 and / or a drive shaft connected to the rotation axis of this drive motor 28, preferably engages in the space of the transmission 44 inside.

The distribution cylinders 09 have in printing operation and thus in those operating position in which the centrally arranged in the inking unit 08 gear 41 is engaged in the drive train, compared to a peripheral speed of the transfer cylinder 06 leading or lagging peripheral speed, so that between the respective distribution cylinder 09 and a friction-driven roller 12 adjacent to the respective distribution cylinder 09; 17; 18 sets a slip, this slip is preferably less than 0.5%. The advance or lag of the distribution cylinder 09 is adjusted by a gear ratio, which results from the ratio of the number of teeth of the respective spur gear 42 of the relevant Reibzylinders 09 to the number of teeth of the same plane E2 on the rotation axis 37 of the transfer cylinder 06 rotatably disposed second gear 38 ,

Fig. 3 shows a perspective view of a section of the gear 44, wherein simplifies the central gear 41 and the three grouped around this central gear 41 spur gears 42 of the distribution cylinder 09 and with the mounted on the axis of rotation 33 of the forme cylinder 04, with the central gear 41st meshing toothed gear 39 are shown. The distribution cylinder 09 and the form cylinder 04 itself and their respective the associated gear 39; 42 bearing journals are in the Fig. 3 not shown for clarity, but by a dash-dotted representation of their respective axis of rotation 33; 43 only hinted.

With the central gear 41 can be brought into meshing, mounted on the axis of rotation 33 of the forme cylinder 04 gear 39 has an axial width B1, in particular flank width B1, the z. B. less than half of an axial width B2, in particular flank width B2 of the spur gears 42 of the distribution cylinder 09 is. The flank width B2 of the spur gears 42 of the distribution cylinder 09 is z. B. in the range between 60 mm and 100 mm, whereas the flank width B1 of the mounted on the axis of rotation 33 of the forme cylinder 04 gear 39 z. B. is in the range between 10 mm and 50 mm. The rotation axes 33; 43; 47 of the co-operating with the central gear 41 gears 39; 42 are arranged parallel to each other.

The Fig. 3 also shows the actuator 46, with which the central gear 41 in the power flow of the transmission 44, ie in the meshing engagement with the mounted on the rotation axis 33 of the forme cylinder 04 gear 39 engageable and / or auskuppelbar from this. By a particular remote-triggered actuation of the actuating element 46 is in the Fig. 3 in its engaged operating position shown central gear 41 linearly displaced along its axis of rotation 47 by the travel .DELTA.L, whereby this central gear 41 is disengaged from the mounted on the rotation axis 33 of the forme cylinder 04 gear 39 is disengaged, the central gear 41, however, with the order the central gear 41 grouped around spur gears 42 of the distribution cylinder 09 remains in meshing due to their respective larger, ie at least twice as large flank width B2. The travel AL is z. B. in the range between 15 mm and 40 mm. The actuator 46 is z. B. designed as a double-acting cylinder or in the case of its formation as a single-acting cylinder, the executed by the actuator 46 coupling process z. B. against the force of a spring element, so that the central gear 41 only remains in the operating state caused by the actuating element 46 as long as the actuation of this actuating element 46 continues. After elimination of the operation of the actuating element 46, the central gear 41 is set back by the force of the spring element in those operating condition, it before the operation of the actuating element 46th had. Alternatively, the actuator 46 may actively transfer the central gear 41 also alternately into its two operating states. In the operating state in which the central gear 41 is disengaged from the gear 39 mounted on the rotational axis 33 of the forme cylinder 04, the inking unit 08 is stopped and thus inoperative.

Again Fig. 3 can also be removed, the three distribution cylinders 09 and mounted on the axis of rotation 33 of the forme cylinder 04 gear 39 in each case in an offset in the range between 60 ° and 120 °, preferably in the range between 70 ° and 110 °, in particular in the range of about 90 ° arranged around the central gear 41 around. The spur gears 42 of the distribution cylinder 09 each have a diameter z. B. in the range between 120 mm and 150 mm. The diameter of the central gear 41 is z. B. in the range between 120 mm and 400 mm, preferably in the range between 150 mm and 300 mm, in particular in the range between 150 mm and 200 mm. The three distribution cylinders 09 lead in the printing operation z. B. a traversing movement, wherein these three rubbing cylinder 09 in opposite directions, by their movement relative to each other preferably by a third z. B. one of each of the three distribution cylinders 09 executable total lift .DELTA.R or one revolution of the friction cylinder 09 in their traversing movement driving crank wheel (not shown) is offset. The executed by each of the three distribution cylinders 09 total lift .DELTA.R is z. B. in the range between 10 mm and 50 mm.

LIST OF REFERENCE NUMBERS

01

printing unit

02

frame

03

printing unit

04

form cylinder

05

-

06

transfer cylinder

07

substrate

08

inking

09

distribution cylinder

10

-

11

Paint reservoir, color box

12

Ink transfer roller

13

Color dosing element, colorimeter

14

ink fountain roller

15

-

16

Ink film roller

17

Ink transfer roller

18

Inking roller

19

Dampening unit, film dampening unit

20

-

21

dampening distribution

22

dampening ductor

23

Dampening solution reservoir

24

-

5

-

26

lever

27

drive motor

28

drive motor

29

drive motor

30

-

31

axis of rotation

32

gear

33

axis of rotation

34

gear

35

-

36

gear

37

axis of rotation

38

gear

39

gear

40

-

41

gear

42

Gear, spur gear

43

axis of rotation

44

Gear, gear transmission

45

-

46

Control element, pneumatic cylinder

47

axis of rotation

B1

Width, side width

B2

Width, side width

E1

level

E2

level

H1

height

H2

height

M

drive motor

.DELTA.L

Travel Range

.DELTA.R

Total stroke

.DELTA.S

Travel Range

Claims (15)

1. Printing unit (01) of a printing press having at least one printing group (03), the printing group (03) comprising at least one forme cylinder (04) and a transfer cylinder (06) acting together with this forme cylinder (04), and an inking unit (08) having several distribution cylinders (09), the forme cylinder (04) and/or the transfer cylinder (06) and all distribution cylinders (09) of this printing group (03) being driven rotationally by a same drive motor (29), the distribution cylinders (09) being driven by the drive motor (29) by means of a drive (44) having a plurality of gearwheels (32; 34; 36; 38; 39; 41; 42), the distribution cylinders (09) in each case having a spur wheel (42), several distribution cylinders (09) of this printing group (03) in each case being driven directly and mutually by an engagement of their respective spur wheel (42) in a central gear wheel (41) rotatable around an axis of rotation (47), the central gear wheel (41) being directly in gear engagement in its operating position coupled into a power flow of the drive (44) with a gear wheel (39) supported on an axis of rotation (33) of the forme cylinder (04), characterized in that all distribution cylinders (09) of this printing group (03) are driven directly and mutually by the central gear wheel (41), the central gear wheel (41) being designed as an individual wheel having only a single sprocket, all gear wheels (32; 34; 36; 38; 39; 41; 42) of the entire drive (44) in each case being straight-toothed.
2. Printing unit (01) according to Claim 1, characterized in that the central gear wheel (41) driving several distribution cylinders (09) of this printing group (03) directly and mutually is engageable into the power flow of the drive (44) or disengageable from this by means of a controllable adjustment element (46).
3. Printing unit (01) according to Claim 1, characterized in that the central gear wheel (41) is designed as a coupling wheel, which can be brought into two different operating positions by the adjustment element (46).
4. Printing unit (01) according to Claim 3, characterized in that the central gear wheel (41) is alternately linearly movable along its axis of rotation (47) around an adjustment path (ΔL) between its two operating positions by the adjustment element (46).
5. Printing unit (01) according to Claim 3, characterized in that the respective spur wheel (42) of each distribution cylinder (09) is in each case permanently in engagement with the central gear wheel (41) in its two operating positions independently of the movement of the central gear wheel (41).
6. Printing unit (01) according to Claim 1, characterized in that the gear wheel (39) mounted on the axis of rotation (33) of the forme cylinder (04) and engageable with the central gear wheel (41) is at least freely rotatably supported on the axis of rotation (33) of the forme cylinder (04).
7. Printing unit (01) according to Claim 1, characterized in that the axis of rotation (47) of the central gear wheel (41) and the axis of rotation (33) of the forme cylinder (04) are arranged parallel to one another at a distance.
8. Printing unit (01) according to Claim 1, characterized in that an overfeed or lag of the distribution cylinder (09) is adjusted by means of a gear ratio which results from a ratio of a number of teeth of the respective spur wheel (42) of the distribution cylinder (09) concerned to a number of teeth of the gear wheel (38) arranged in a rotationally fixed manner in a same plane (E2) on the axis of rotation (37) of the transfer cylinder (06).
9. Printing unit (01) according to Claim 1, characterized in that the drive motor (29) is assigned only to a single printing group (03).
10. Printing unit (01) according to Claim 1, characterized in that in the printing group (03) solely the forme cylinder (04) and the transfer cylinder (06) acting together with this forme cylinder (04) and the distribution cylinder (09) of the inking unit (08) are driven in the drive train starting from the drive motor (29).
11. Printing unit (01) according to Claim 1, characterized in that the distribution cylinders (09) in printing operation are in each case of oscillating design, the oscillating motion of the distribution cylinders (09) being in opposite directions relative to one another.
12. Printing unit (01) according to Claim 1, characterized in that two printing groups (03) are arranged in a same frame (02), each of these printing groups (03) in each case comprising a forme cylinder (04) and in each case a transfer cylinder (06) acting together with the respective forme cylinder (04), the transfer cylinders (06) of these printing groups (03) being employed against each other at least in the printing operation of this printing unit (01).
13. Printing unit (01) according to Claim 12, characterized in that each of the printing groups (03) has a drive train with its own drive motor (29) separate drivewise from the respective other printing group (03).
14. Printing unit (01) according to Claim 1, characterized in that the drive (44) takes up an installation space having an installation height (H2) of less than 60% of an installation height (H1) of the printing group (03).
15. Printing unit (01) according to Claim 1, characterized in that the drive train (44) starting from the drive motor (29) and guided through the plurality of gear wheels (32; 34; 36; 38; 39; 41) of the drive ends at the front wheels (42) of this distribution cylinder (09).

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