EP0919372B2 - Printing unit for a rotary printing machine - Google Patents

Abstract

Two plate cylinders (24a,24b) are rotarily mounted in the housing (18). the first plate cylinder has a first offset blanket cylinder (10a), while the second plate cylinder has a second offset blanket cylinder (10b). The offset blanket cylinders of the same diameter as their plate cylinders each have a rubber blanket sleeve (12a,12b). The two plate cylinders each have a length four times the width of one newspaper page, and a periphery corresponding to the height of one newspaper page, and four printing plates corresponding to the pages of a newspaper.

Description

The present invention relates to a rubber / rubber printing unit for a web-fed rotary offset printing press according to claims 1 and 23.

In a web-fed rotary offset printing machine, a moving paper web is usually passed through a plurality of rubber / rubber printing units which print a multicolor image on both sides of the web. For the drive of the printing units, there are various known from the prior art types of drive systems and drive principles.

One of the most conventional drive principles employed in most of the current web-fed rotary printing presses includes a mechanical longitudinal shaft which is connected to a main drive of the printing press and which drives each of the rubber / rubber printing units via a respective bevel gear. The bevel gear is drivingly connected to a gear train of the respective printing unit, which comprises the meshing drive wheels of the upper and lower plate cylinder and the associated blanket cylinder.

DE 41 38 479 A1 Baumüeller describes a rubber / rubber printing unit in which each of the upper and lower plate cylinders and blanket cylinders is independently driven by a dedicated motor without mechanical connection between the cylinders. Due to slippage occurring between the upper and lower blanket cylinders, as is commonly seen in web-fed rotary blanket offset printing presses with sleeve-shaped blankets arranged thereon, register errors and typographical errors are very likely to occur. In addition, the use of an individual electric motor for each cylinder of the printing unit requires a complex control electronics to rule out registration errors in the printed images, especially at high machine speeds.

EP 0 64 40 48 A2 discloses a rubber / rubber printing unit for a web-fed rotary printing press in which the upper plate cylinder and its associated upper blanket cylinder are mechanically connected via a first gear train and driven by a first electric motor via a first gear. The lower plate cylinder and its associated lower blanket cylinder are mechanically connected via a second gear train and are driven by a second electric motor via a second gear. In this document, a satellite printing unit is further described, in which the central impression cylinder is driven by a first electric motor, and the plate cylinder and the blanket cylinder of each satellite plate / blanket cylinder pair are mechanically connected by a separate gear train and driven separately by an associated own electric motor become. In this case, each of the electric motors for driving the satellite cylinder pairs drives the respective blanket cylinder of the cylinder pair via a transmission. In the in the EP 0 64 40 48 A2 described printing units can in the same manner as in the printing of the DE 41 38 479 A1 Register errors and printing errors appear in appearance, which in the case of printing units with cantilevered blanket cylinders with sleeve-shaped Giessen towels z. B. can be caused by a wandering of the blankets on the first and second blanket cylinder of the respective printing unit.

The JP 63-236651 discloses a rubber / rubber printing unit for a web-fed rotary printing press in which an upper blanket cylinder and an associated upper plate cylinder are drivingly connected to each other via a first gear train and a lower blanket cylinder and an associated lower plate cylinder via a second gear train. A first motor drives the upper and a second motor to the lower plate cylinder. The in the JP 63-236651 described arrangement is also susceptible to register problems and printing errors when using floating blanket cylinder sleeve-shaped blankets are used.

From the WO 99/06211 (cited under Art. 54 (3) - (4) EPC) a printing unit for an offset printing machine with at least two forme cylinders and at least two transfer cylinders is known. Furthermore, in at least one of the printing units of the offset printing press, two transfer cylinders are coupled on the drive side and driven by their own drive motor. This means that a printing unit has three drive motors. Also revealed WO 99/06211 another printing unit for an offset printing machine, which consists of a forme cylinder, a transfer cylinder and a counter-pressure cylinder. The forme cylinder has its own drive motor, while the transfer cylinder and the impression cylinder are coupled on the drive side and have their own drive motor. This configuration allows, in contrast to the above configuration, only one-sided printing of a material web. In addition, the second configuration has only two drive motors per printing unit.

It is the object of the present invention to provide a rubber / rubber printing unit in which the occurrence of printing errors, in particular register errors between the upper and lower pairs of printing cylinders, excluded. Furthermore, it is the object of the present invention to provide a rubber / rubber printing unit that can be operated without additional guide rollers and complex mechanical devices either as an imprinter or as a conventional rubber / rubber printing unit.

This object is achieved by the features of claims 1 and 23.

The invention comprises a first claimed variant and a second claimed variant.

The invention comprises a printing unit for a web-fed rotary printing press, in particular a first blanket cylinder associated with a first plate cylinder and a second blanket cylinder associated with a second plate cylinder. The first blanket cylinder is in rolling contact with the second blanket cylinder and is mechanically coupled to the latter. The printing unit according to the invention further comprises a first drive motor for individual drive of the first plate cylinder, a second drive motor for individual drive of the second plate cylinder and a third drive motor for the common drive of the first and second blanket cylinder.

According to one embodiment of the invention, the first and second blanket cylinders are mechanically coupled to each other via intermeshing gears, the gears may be mounted on the respective drive shafts of the first and second blanket cylinder, and wherein the third drive motor, the first and the second blanket cylinder via a Gear or a drive belt comprehensive gear drives.

The first and second blanket cylinders may have a respective drive shaft; and the third drive motor may directly drive the first and second blanket cylinders via an associated drive shaft.

According to the first claimed variant of the invention, the first and the second plate cylinder can by their respective first and second drive motor directly, d. H. be driven without a gear. In this embodiment, the first plate cylinder by the first drive motor z. B. via a transmission comprising a gear or a drive belt, are driven.

It is also possible that the second plate cylinder by the second drive motor übet a gear which comprises a gear or a drive belt is driven.

According to a further exemplary embodiment of the invention, the first plate cylinder and / or the second plate cylinder can be adjusted to the respective first and second blanket cylinders assigned to them and can be turned off when the printing unit is in the continuous printing operation. Furthermore, in this embodiment of the invention, the printing unit can be operated as an imprinting unit in which the first and second plate cylinders can be switched on and off alternately to their associated blanket cylinder to alternately print on one side of the web and the impression cylinder pair for printing on the prepare another side of the web in a subsequent print job, without the printing operation is interrupted.

According to the first claimed variant of the invention, the blanket cylinder known flying paper blanket cylinder mounted thereon with sleeve-shaped or endless blankets, as described for. B. in the US 5,440,981 or in the US 5,429,048 are described.

Further features of the invention are contained in the subclaims.

The present invention will become more apparent from the following description of preferred embodiments taken in conjunction with the accompanying drawings below.

Fig. 1

eine schematische Ansicht der ersten beanspruchten Variante eines Gummi/Gummi-Druckwerks gemäß vorliegender Erfindung, bei dem die Platten- und Gummituchzylinder durch drei zugeordnete Antriebsmotoren über Zahnräder angetrieben werden;

Fig. 2

eine weitere Ausführungsform der ersten beanspruchten Variante eines Gummi/Gummi-Druckwerks, dessen Zylinder über Antriebsriemem angetrieben werden;

Fig. 3

eine weitere Ausführungsform eines Gummi/Gummi-Druckwerks der ersten beanspruchten Variante, dessen erster und zweiter Plattenzylinder durch jeweils einen zugeordneten Antriebsmotor direkt angetrieben werden, und bei dem der dritte Antriebsmotor einen der Gummituchzylinder direkt antreibt;

Fig. 4

eine schematische Seitenansicht zweier Gummi/Gummi-Druckwerke gemäß der ersten beanspruchten Variante, welche als Eindruckwerke betrieben werden.

Show it:

Fig. 1

a schematic view of the first claimed variant of a rubber / rubber printing unit according to the present invention, in which the plate and blanket cylinders are driven by three associated drive motors via gears;

Fig. 2

a further embodiment of the first claimed variant of a rubber / rubber printing unit, the cylinders are driven by Antriebsriemem;

Fig. 3

another embodiment of a rubber / rubber printing unit of the first claimed variant, the first and second plate cylinders are driven directly by a respective drive motor, and wherein the third drive motor drives one of the blanket cylinder directly;

Fig. 4

a schematic side view of two rubber / rubber printing units according to the first claimed variant, which are operated as imprints.

As in Fig. 1 shown comprises a rubber / rubber printing unit 1 for a web-fed rotary printing press, preferably an offset newspaper printing press, a housing 2 in which a first upper plate cylinder 4a, an associated first upper blanket cylinder 6a, a second lower plate cylinder 4b and an associated second lower blanket cylinder 6b are rotatably mounted in bearings, not shown. Although the cylinders 4a, 4b, 6a and 6b are shown as being in rolling contact with each other here, each of the plate cylinders 4a, 4b may be separated from its associated blanket cylinder 6a, 6b by a known shutoff mechanism (not shown), as shown in Figs. B. in the US 5,301,609 is described. In the same way, as described above, the first blanket cylinder 6a and the second blanket cylinder 6b can also by a known shut-off mechanism, for. B. by the in the US 5,301,609 described, from each other.

As further shown in the drawings, one or more inking rollers 8a, 8b may be respectively associated with the first and second plate cylinders 4a, 4b to apply ink to the printing plates (not shown) disposed on the respective plate cylinders 4a, 4b.

According to a first embodiment of the first claimed variant, the in Fig. 1 is shown, a first drive motor 10a for the individual drive of the first plate cylinder 4a is mechanically connected thereto, via a first gear 12a, which preferably comprises a gear 14a, which is mounted on a drive shaft 16a of the first drive motor 10a, and a Gear 18a, which is connected to the drive shaft 20a of the first plate cylinder 4a. As in Fig. 1 is shown schematically, the first drive motor 10a may drive the first plate cylinder 4a associated first inking roller 8a either directly or via another gear 22a.

In the same way, a second drive motor 10b is mechanically connected to the second plate cylinder 4b via a second gear 12b, a gear 14b mounted on the drive shaft 16b of the second drive motor 10b, and a gear mounted on the drive shaft 20b of the second plate cylinder 4b 18b may include.

The inking rollers 8b associated with the second plate cylinder 4b may, according to the first claimed variant, be driven by the second drive motor 10b either directly or by means of a gear 22b connected to the drive shaft 16b or by the gear 14b of the second drive motor 10b. In some cases, according to the first claimed variant, it may also be advantageous to the inking rollers 8a, 8b by its own independent motor, for. B. an electric motor to drive directly.

Like from the Fig. 1 Further, the first blanket cylinder 6a and the second blanket cylinder 6b are mechanically coupled to each other by the gears 24a and 24b which can be mounted on the respective drive shafts 26a and 26b of the first blanket cylinder 6a and the second blanket cylinder 6b.

, In the embodiment of Fig. 1 A third motor 28 drives the first and second blanket cylinders 6a and 6b via a gear 32 which may include a gear 38 mounted on the drive shaft 30 of the third drive motor 28. The gear 38 may be engaged with the gear 24a of the first blanket cylinder 6a or also with the gear 24b of the second blanket cylinder 6b, as shown in FIG Fig. 1 is shown.

After another, in Fig. 2 shown embodiment of the present invention according to the first claimed variant, the first and / or the second plate cylinder 4a, 4b respectively via drive belts 34a, 34b, preferably toothed belts and their associated pulleys or toothed pulleys driven. That is, the gears 12a and 12b for driving the first and second plate cylinders 4a, 4b are drive belts, or at least each includes a drive belt 34a, 34b and respective pulleys. The drive belts 34a, 34b may be known timing belts having the ability to dampen shock and vibration caused by concentricity errors of the cylinders and / or gears and pulleys when the printing unit 1 is in operation. The use of drive belts 34a, 34b has the further advantage that the drive motors 10a, 10b can have a larger diameter than the respective associated plate cylinder 4a, 4b, whereby more space for the structural design of a printing unit 1 is created.

As in Fig. 2 As further shown, it may also be advantageous to use another drive belt 36, preferably a toothed belt, and respective pulleys for driving the first and second blanket cylinders 6a, 6b. For example, the transmission 32 for driving the first and second blanket cylinders 6a, 6b may comprise a drive belt 36 and respective pulleys mounted on the drive shaft 30 of the third drive motor 28 and on the drive shaft of the first or second blanket cylinder 6a, 6b.

According to a further embodiment of the first claimed variant of the invention, in Fig. 3 1, the first plate cylinder 4a, the second plate cylinder 4b and / or the blanket cylinders 6a, 6b mechanically coupled to one another can each be driven directly by the respective drive motors 10a, 10b and 28 via the drive shafts 16a, 16b and 30. In this embodiment of the invention, the drive motors 10a, 10b and 28 may also be arranged on different levels, for. Example, by the drive shafts 16 a, 16 b and 30 are used with different lengths, so that the housing of adjacent drive motors, for. B. of drive motor 10a and 28 of the drive motor may have a larger diameter than the associated plate cylinder and / or blanket cylinder.

Although in the embodiments of the Fig. 1 to 3 all plate cylinders 4a, 4b and blanket cylinders 6a, 6b are shown driven by the same type of drive (direct drive or gear with gears or drive belts), it is possible that other types of drive, e.g. Example, a direct drive for the first and second blanket cylinder 6a, 6b and a drive belt 34a, 34b for the first plate cylinder 4a and / or the second plate cylinder 4b can be applied.

As in Fig. 4 is shown, the inventive rubber / rubber printing unit 1 according to the first claimed variant can continue to be used as an imprinting device for the alternate printing of various images on a moving web 40 without the printing operation must be interrupted for Einrichtvorgänge. How out Fig. 4 it can be seen, a running paper web 40 is successively printed by a first printing unit 1 and an associated second printing unit 1 '. For operation of the first printing unit 1 and the second downstream printing unit 1 'in the impression mode (flying plate change), the first plate cylinder 4a of the first printing unit 1 is turned off by its associated first blanket cylinder 6a, as in Fig. 4 indicated by dashed lines. Following this, the first plate cylinder 4a, for example, stopped and with new printing plates with a new printed image, for. B. for another local newspaper issue, be fitted while the first blanket cylinder 6a of the first printing unit 1 of Fig. 4 still in contact with the moving web 40. In this mode of operation shown in dashed lines, only the upper plate cylinder 4a 'of the second printing unit 1' and the blanket cylinder 6a 'associated therewith are in rolling contact with each other and with the upper side of the web 40 and transmit a colored image on top of the moving web 40. Accordingly, no image is transferred to the web 40 by the pair of cylinders 4a, 6a of the first printing unit 1, although the upper blanket cylinder 6a may still be in rolling contact with the moving web 40 and the web 40 printed on its underside by the pair of cylinders 4b, 6b becomes.

After a predetermined number of signatures in the in Fig. 4 shown in dashed lines arrangement of the printing units 1 and 1 ', the upper plate cylinder 4a of the first printing unit 1 is accelerated again by its associated first drive motor until its speed and its angular position with the speed and angular position of its associated blanket cylinder 6a to match. Subsequently, the upper plate cylinder 4 a is brought into rolling contact with the upper blanket cylinder 6 a of the first printing unit 1. At the same time, the upper plate cylinder 4a 'of the second printing unit 1' is turned off by the associated blanket cylinder 6a 'and decelerated by its associated drive motor or brake system, not shown, so that the printing plates of the upper plate cylinder 4a' of the second printing unit 1 'are replaced can after the cylinder has come to rest. In this mode, the in Fig. 4 shown in solid lines, the upper side of the moving web 40 is printed by the first plate cylinder 4a of the first printing unit 1; and no printed image is transferred to the upper side of the web 40 by the pair of cylinders 4a ', 6a' of the second printing unit 1 ', although the upper blanket cylinder 6a' of the second printing unit 1 'may still be in contact with the moving web 40 and the web 40 on its underside by the cylinder pair 4b ', 6b' is printed.

According to another embodiment of the invention, the rubber / rubber printing unit 1 can be arranged in a horizontal orientation in which the web 40 is substantially vertical.

Furthermore, a plurality of printing units 1, 1 'can be arranged one above the other in order to print a multicolored image on the web 40.

The printing unit according to the first claimed variant is used with first and / or second blanket cylinder 6a, 6b of known design, which are mounted with one end in a side wall of the housing 2 of the printing unit 1 and which a known sleeve-shaped or endless blanket 7a, 7b ( Fig. 4 ), which can be laterally applied to the respective blanket cylinder 6a, 6b and removed therefrom by an opening formed in the opposite side wall of the housing 2. Here, a register setting of the printing unit 1, z. B. after a plate change, effortlessly by pre-turning or turning back the respective first or second plate cylinder 4a, 4b are achieved without simultaneously changing the angular position or speed of the mechanically connected first and second blanket cylinders 6a, 6b with.

LIST OF REFERENCE SIGNS

1

first rubber / rubber printing unit

1'

second rubber / rubber printing unit

2,2 '

casing

4a

first upper plate cylinder of the first printing unit 1

4a '

upper plate cylinder of the second printing unit 1 '

4b

second lower plate cylinder of the first printing unit. 1

4b '

lower plate cylinder of the second printing unit 1 '

6a

first upper blanket cylinder of the first printing unit 1

6a '

Upper blanket cylinder of the second printing unit 1 '

6b

second lower blanket cylinder of the first printing unit

6b '

lower blanket cylinder of the second printing unit 1 '

7a, a '

sleeve-shaped blanket of the blanket cylinder 6a, 6a '

7b, b '

sleeve-shaped rubber blanket of the blanket cylinder 6b, 6b '

8a, a '

Inking roller

8b, b '

Inking roller

10a

first drive motor for the first plate cylinder 4a

10b

second drive motor for the second plate cylinder 4b

12a

first transmission

12b

second gear

14a

Gear of the first drive motor 10a

14b

Gear of the second drive motor 10b

16a

Drive shaft of the first drive motor

16b

Drive shaft of the second drive motor

18a

gear

18b

gear

20a

drive shaft

20b

drive shaft

22a

transmission

22b

transmission

24a

Gear of the first blanket cylinder 6a

24b

Gear of the second blanket cylinder 6b

26a

Drive shaft of 6a '

26b

Drive shaft of 6b

28

third drive motor

30

Drive shaft of the third drive motor 28th

32

transmission

34a

drive belts

34b

drive belts

36

drive belts

38

gear

40

train

Claims (43)

1. A printing unit for a web-fed rotary printing press comprising the following features: a first plate cylinder (4a); a blanket cylinder (6a) associated with the first plate cylinder (4a); a second plate cylinder (4b); a second blanket cylinder (6b) associated with the second plate cylinder (4b), the second blanket cylinder (6b) being in rolling contact with the first blanket cylinder (6a) and mechanically coupled to the latter; a first drive motor (10a) for individually driving the first plate cylinder (4a); a second drive motor (10b) for individually driving the second plate cylinder (4b): and a third drive motor (28) for driving the first and the second blanket cylinder (6a, 6b), the first blanket cylinder (6a) and/or the second blanket cylinder (6b) carrying an endless blanket.
2. The printing unit according to Claim 1,
   characterised in that
   ink form rollers (8a, 8b) are driven either directly or via a gear mechanism (22a, 22b) by the drive motor (10a, 10b) of the associated plate cylinder (4a, 4b).
3. The printing unit according to either of the preceding claims,
   characterised in that
   the second plate cylinder (4b) is engageable with and disengageable from the associated second blanket cylinder (6b) when the printing unit (1) is in operation.
4. The printing unit according to Claim 3,
   characterised in that
   the printing unit (1) is an imprinting unit in which the first and second plate cylinders (4a, 4b) can be engaged and disengaged in an alternating way to print onto the first and second sides of a running web (40) in an alternating way.
5. The printing unit according to any of the preceding claims,
   characterised in that
   the first and second blanket cylinder (6a, 6b) are mechanically coupled to each other via meshing gearwheels (24a, 24b).
6. The printing unit according to Claim 5,
   characterised in that
   the gearwheels (24a, 24b) are connected to the respective drive shafts (26a, 26b) of the first and second blanket cylinder (6a, 6b).
7. The printing unit according to any of the preceding claims,
   characterised in that
   the third drive motor (28) drives the first and second blanket cylinder (6a, 6b) via a gear mechanism (32).
8. The printing unit according to Claim 7,
   characterised in that
   the gear mechanism (32) comprises a gearwheel (24a, 24b).
9. The printing unit according to Claim 7,
   characterised in that
   the gear mechanism (32) comprises a drive belt (36).
10. The printing unit according to any of Claims 1 to 6,
    characterised in that
    the third drive motor (28) drives the first and second blanket cylinder (6a, 6b) directly via a drive shaft (30).
11. The printing unit according to any of the preceding claims,
    characterised in that
    the first drive motor (10a) directly drives the first plate cylinder (4a).
12. The printing unit according to any of the preceding claims,
    characterised in that
    the second drive motor (10b) drives the second plate cylinder (4b) directly.
13. The printing unit according to any of Claims 1 to 10,
    characterised in that
    the first plate cylinder (4a) is driven by the first drive motor (10a) via a gear mechanism (12a).
14. The printing unit according to Claim 13,
    characterised in that
    the gear mechanism (12a) comprises a gearwheel (14a, 18a).
15. The printing unit according to Claim 13,
    characterised in that
    the gear mechanism (12a) comprises a drive belt (34a).
16. The printing unit according to any of Claims 1 to 10 or 13 to 15,
    characterised in that
    the second plate cylinder (4b) is driven by the second drive motor (10b) via a gear mechanism (12b).
17. The printing unit according to Claim 16,
    characterised in that
    the gear mechanism (12b) comprises a gearwheel (14b, 18b).
18. The printing unit according to Claim 16,
    characterised in that
    the gear mechanism (12b) comprises a drive belt (34b).
19. The printing unit according to any of the preceding claims,
    characterised in that
    the latter is arranged in a horizontal orientation in which the web (40) runs substantially vertically.
20. A web-fed rotary printing press comprising one or more printing units according to Claim 1.
21. The web-fed rotary printing press according to Claim 20,
    characterised in that
    a plurality of printing units (1, 1') are arranged over one another in order to print a multi-coloured image onto the web (40).
22. An offset newspaper printing press comprising one or more printing units according to Claim 1.
23. A printing unit for a web-fed rotary printing press that comprises the following features: a first plate cylinder (4a); a first blanket cylinder (6a) associated with the first plate cylinder (4a); a second plate cylinder (46); a second blanket cylinder (6b) associated with the second plate cylinder (4b), the second blanket cylinder (6b) being in rolling contact with the first blanket cylinder (6a) and mechanically coupled to the latter; a first drive motor (10a) for individually driving the first plate cylinder (4a); a second drive motor (10b) for individually driving the second plate cylinder (4b); and a third drive motor (28) for driving the first and the second blanket cylinder (6a, 6b),
    characterised in that
    ink form rollers (8a, 8b) are driven directly by the drive motor (10a, 10b) of the associated plate cylinder (4a, 4b).
24. The printing unit according to Claim 23,
    characterised in that
    the second plate cylinder (4b) is engageable with and disengageable from the associated second blanket cylinder (6b) when the printing unit (1) is in operation.
25. The printing unit according to Claim 24,
    characterised in that
    the printing unit (1) is an imprinting unit in which the first and second plate cylinders (4a, 4b) can be engaged and disengaged in an alternating way to print onto the first and the second sides of a running web (40) in an alternating way.
26. The printing unit according to any of the preceding Claims 23 to 25,
    characterised in that
    the first and second blanket Cylinder (6a, 6b) are mechanically coupled to each other via meshing gearwheels (24a 24b).
27. The printing unit according to Claim 26,
    characterised in that
    the gearwheels (24a, 24b) are connected to the respective drive shafts (26a, 26b) of the first and second blanket cylinder (6a, 6b).
28. The printing unit according to any of the preceding Claims 23 to 27,
    characterised in that
    the third drive motor (28) drives the first and second blanket cylinder (6a, 6b) via a gear mechanism (32).
29. The printing unit according to Claim 28,
    characterised in that
    the gear mechanism (32) comprises a gearwheel (24a, 24b)
30. The printing unit according to Claim 28,
    characterised in that
    the gear mechanism (32) comprises a drive belt (36).
31. The printing unit according to any of Claims 23 to 27,
    characterised in that
    the third drive motor (28) drives the first and second blanket cylinder (6a, 6b) directly via a drive shaft (30).
32. The printing unit according to any of the preceding Claims 23 to 31,
    characterised in that
    the first drive motor (10a) directly drives the first plate cylinder (4a).
33. The printing unit according to any of the preceding Claims 23 to 32,
    characterised in that
    the second drive motor (10b) directly drives the second plate cylinder (4b).
34. The printing unit according to any of Claims 23 to 31,
    characterised in that
    the first plate cylinder (4a) is driven by the first drive motor (10a) via a gear mechanism (12a).
35. The printing unit according to Claim 34,
    characterised in that
    the gear mechanism (12a) comprises a gearwheel (14a, 18a).
36. The printing unit according to Claim 34,
    characterised in that
    the gear mechanism (12a) comprises a drive belt (34a).
37. The printing unit according to any of Claims 23 to 31 or 34 to 36,
    characterised in that
    the second plate cylinder (4b) is driven by the second drive motor (10b) via a gear mechanism (12b).
38. The printing unit according to Claim 37,
    characterised in that
    the gear mechanism (12b) comprises a gearwheel (14b, 18b).
39. The printing unit according to Claim 37,
    characterised in that
    the gear mechanism (12b) comprises a drive belt (34b).
40. The printing unit according to any of the preceding Claims 23 to 39,
    characterised in that
    the latter is arranged in a horizontal orientation in which the web (40) runs substantially vertically.
41. A snreb-fed rotary printing press comprising one or more printing units according to Claim 23.
42. The web-fed rotary printing press according to Claim 41,
    characterised in that
    a plurality of printing units (1, 1') are arranged over one another in order to print a multi-coloured image onto the web (40).
43. An offset newspaper printing press comprising one or more printing units according to Claim 23.

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