GB2261851A

GB2261851A - Drive for rotary sheet fed printing presses.

Info

Publication number: GB2261851A
Application number: GB9223288A
Authority: GB
Inventors: Klemens Kemmerer; Harald Bayer
Original assignee: MAN Roland Druckmaschinen AG
Current assignee: Manroland AG
Priority date: 1991-11-09
Filing date: 1992-11-06
Publication date: 1993-06-02
Anticipated expiration: 2012-11-06
Also published as: JP2905015B2; DE4136902C1; GB2261851B; DE4136902C2; JPH05246002A; GB9223288D0

Description

3 -.

ú- A 7 -1 DRIVE FOR ROTARY SHEET FED PRINTING PRESSES This invention relates to dr"i-ve arrangements for rotary sheet fed printing presses of serial construction.

Drives for rotary sheet fed printing presses of serial construction are known, the individual print units of which are coupled by a closed gear train (e.g. DE-AS 2 334 177, US-PS 2 115 975). Furthermore, it is known that each print unit can have its own input gear drive with a closed gear train (e.g. DD-WP 159 862). Disadvantageous with a closed gear train is that, because of oscillations, tolerances, etc. mutual influencing of the printing units among one another is unavoidable.

Differing drive moments lead partially to damaging increases in load on the drive elements, which leads to premature wear of the drive as well as to a diminution in the print quality of the product. With the use of closed gear drives for perfect printing, laborious solutions are required to effect the phase shift (e.g. DE-GM 8 319 431).

The invention seeks to avoid the disadvantages known from the state of the art. In accordance with the inventionr there is provided a drive arrangement for a rotary sheet printing press of serial construction with an engageable drive shaft running along the press and an input gear per print unit, characterised in that each print unit, decoupled relative to the preceding or subsequent print units, has a separate compact gear train which is constructed by the arrangement single size impression cylinder gear and a single size transfer drum or turning drum gear or double size impression cylinder gear and single size transfer or turning drum gear using intermediate gears and that each input gear is engaged via an intermediate gear or direct with an impression cylinder is or transfer or turning drum gear of the separate compact gear train.

The drive in accordance with the invention guarantees a unified distribution of moment to the individual print units. On machines with perfect printing units, in the drive shaft an E-clutch is arranged per print unit. By use of the separate compact gear train and an E-clutch in the drive shaft per unit, the changeover from one side to perfect printing is essentially easier. Only separation of a particular part of the drive shaft for the purpose of introducing the phase shift is necessary. The number of the print units can be broadened according to need with the same large moment, so that in accordance with the principle of unit construction, a multi-colour sheet rotary printing press of, e.g., 10 printing units arises. By means of shut off print units possible printing errors are quicker to recognise (direct error recognition) and any wastage is reduced.

V is The use of single size gears is easy for assembling. If the bearing diameter is constructed larger than the external tooth tip diameter of the gears, then the pulling of gears, e.g. on cylinder installation, can be omitted.

The invention is illustrated in more detail with reference to the accompanying drawings which show examples of its application. In the drawings:

Figure 1 shows a rotary sheet fed printing press with several print units and in each case a separate compact gear train with the arrangement: single size impression cylinder gear and single size drum gear per print unit.

Figure 2 is a plan view of the process of Figure 1.

Figure 3 shows a rotary sheet printing press with several print units and in each case a separate compact gear train with the arrangement double size impression cylinder gear and single size drum cylinder gear per print unit, Figure 4 is a plan view of Figure 3.

The rotary sheet printing press illustrated in Figure 1 and 2 is constructed in serial fashion with six print units 1 to 6. Each print unit has an impression cylinder, a blanket cylinder and a plate cylinder as well as a transfer drum in place of which a sheet turning drum can also be installed. The trunnions of the cylinders as well as of the transfer or turning drum carry toothed gears and form for each print unit using intermediate gears a separate compact gear train which is decoupled from the preceding or subsequent print units. The necessary drive power is generated by a drive motor 7 which drives an engageable drive shaft 9 which runs along the press. Branching off from the drive shaft 9 for each print unit is an entry gear 10 which, on the feeder print unit 1, is engaged with the intermediate gear 15 and for the following print units 2 to 6 is engaged directly with the single size transfer drum or the turning drum toothed gear 13 of the compact gear train. The compact gear train, separate for each print unit and decoupled from the print units arranged in front and behind is constituted in the present example by the arrangement of single size transfer drum gear 13, intermediate gears 15 to 17 and single size impression cylinder gear 12.

If the transfer drum is substituted by a sheet turning drum, then in the drive shaft 9 for each respective print unit an E clutch 11 is arranged. The changeover from one side to perfect printing only the separation of the drive shaft 9 is necessary.

In the region of the sheet transfer between transfer or turning drum and impression cylinder a synchronisation unit 20 is arranged. This consists, e.g. of a prism arranged on the transfer drum and a roller arranged on the impression cylinder (catchfork principle) or of inter-engaging toothed ring segments.

Arranged on each print unit is a turning moment controller 19, which preferably is connected on the servicing side with the respective impression cylinder. Thus, e.g. a braking apparatus can be installed which is formed at least by one gear pump.

1 The rotary sheet printing press illustrated in Figures 3 and 4 is constructed in terms of its basic construction analogously to that according to Figures 1 and 2.

The input gear 10 is directly engaged for all print units with the respective double size impression cylinder gear wheel 14. The separate compact gear train for each print unit is formed in the present example by the arrangement of double size impression cylinder 14 intermediate gears 15, 16 and single size transfer gear 13. Synchronisation unit 20 and moment controller 19 are constructed analogously to Figures 1 and 2.

In a further embodiment not illustrated in the drawing each input gear 10 is engaged with an intermediate gear 15 which forms, direct or via a further intermediate gear 16 with a single size impression cylinder gear 12 or single size transfer drum gear 13, the separate compact gear train for each print unit.

Claims

CLAIMS is 1. A drive arrangement for a rotary sheet printing press of

serial construction with an engageable drive shaft running along the press and an input gear per print unit, characterised in that each print unit, decoupled relative to the preceding or subsequent print units. has a separate compact gear train which is constructed by the arrangement single size impression cylinder gear and a single size transfer drum or turning drum gear or double size impression cylinder gear and single size transfer or turning drum gear using intermediate gears and that each input gear is engaged via an intermediate gear or direct with an impression cylinder or transfer or turning drum gear of the separate compact gear train.
2. A Drive according to Claim 1, characterised in that a synchronisation unit is arranged in the region of the sheet transfer between transfer drum or turning drum and impression cylinder.
3. A drive according to Claim 1 or 2 and including a momentum control coupled to each print unit.
4. A drive according to Claim 1 and substantially as hereinbefore described with reference to the accompanying drawings.