Printing group of a rotary printing press
A printing group of a rotary printing press includes at least one forme cylinder and at least one transfer cylinder. The forme cylinder has at least two printing forme end receiving channels. These two channels are spaced circumferentially. At least one of these forme cylinder end receiving channels rolls off against a channel in the transfer cylinder. One of the forme cylinder end receiving channels is at least partially covered by a printing forme carried by the forme cylinder.
1. A printing group of a rotary printing press comprising:
at least a first pair of cylinders including at least one transfer cylinder and at least one cooperating forme cylinder, said at least one transfer cylinder and said at least one cooperating forme cylinder each having a cylinder length of at least six newspaper page widths and a cylinder circumference of two newspaper page heights;
at least two transfer cylinder grooves in a circumferential surface of said at least one transfer cylinder, said at least two transfer cylinder grooves being arranged circumferentially one behind the other;
at least three printing blankets on said at least one transfer cylinder and arranged adjacent each other in an axial direction of said at least one transfer cylinder, adjacent ones of said at least three printing blankets being circumferentially offset from each other, each of said at least three printing blankets extending over said circumferential surface of said at least one transfer cylinder except for an associated one of said at least two transfer cylinder grooves; and
at least two forme cylinder grooves in a circumferential surface of said at least one forme cylinder cooperating with said at least one transfer cylinder, said at least two forme cylinder grooves being arranged circumferentially offset by 180° one behind the other, each of said forme cylinder grooves extending along said forme cylinder length.
2. The printing group of claim 1 wherein each said printing blanket includes at least a support plate and a layer connected with said support plate.
3. The printing group of claim 1 wherein each said printing blanket is a rubber blanket.
4. The printing group of claim 1 wherein a ratio of a circumference of said at least one transfer cylinder to a circumference of said at least one forme cylinder is a whole number.
5. The printing group of claim 1 further including at least one end holding device in each said groove.
6. The printing group of claim 4 wherein said whole number is one.
7. A printing group of a rotary printing press comprising:
a forme cylinder, said forme cylinder having a barrel with a forme cylinder circumference and a forme cylinder length, said forme cylinder length corresponding to at least six newspaper page widths, said forme cylinder circumference corresponding to two newspaper page heights;
at least first and second axially extending grooves on said circumference of said forme cylinder, said first and second grooves being offset by 180° from each other in said forms cylinder circumferential direction, both of said forme cylinder grooves extending axially along said forme cylinder length of said forme cylinder barrel;
at least one transfer cylinder arranged to work in cooperation with said forme cylinder, said at least one transfer cylinder having a transfer cylinder barrel with a transfer cylinder circumference and a transfer cylinder length, said transfer cylinder length corresponding to at least six newspaper page widths, said transfer cylinder circumference corresponding to two newspaper page heights;
at least three blankets arranged adjacent each other in an axial direction of said at least one transfer cylinder and extending over said transfer cylinder length of said transfer cylinder barrel, each said blanket being multi-layered and including a support plate and a layer connected to said support plate; and
a plurality of printing forme on said forme cylinder, each of said printing formes having ends, said ends being aligned along said forme cylinder barrel.
8. The printing group of claim 7 wherein said transfer cylinder has at least one blanket end receiving gap having a width of 1 to 5 mm.
9. The printing group of claim 7 wherein said transfer cylinder circumference has a gap with a circumferential width of no greater than 3 mm.
10. The printing group of claim 7 wherein said blanket is a rubber blanket.
11. The printing group of claim 7 wherein a ratio of said transfer cylinder circumference to said forme cylinder circumference is a whole number.
12. The printing group of claim 7 wherein each said forme cylinder groove has a width of 1 to 5 mm.
13. The printing group of claim 1 wherein each said forme cylinder groove has a width of 1 to 5 mm.
14. The printing group of claim 12 wherein each said forme cylinder groove width is no greater than 3 mm.
15. The printing group of claim 13 wherein each said forme cylinder groove width is no greater than 3 mm.
16. The printing group of claim 7 wherein each said forme cylinder groove includes at least one holding device.
17. The printing group of claim 1 further including a second pair of cylinders including a second transfer cylinder and a cooperating second forme cylinder, said second transfer cylinder being engageable with said at least one transfer cylinder.
18. The printing group of claim 5 wherein each said holding device is driven by a spring force.
19. The printing group of claim 16 wherein each said holding device is driven by a spring force.
20. The printing group of claim 1 wherein each said groove is inclined at an angle between 30° and 60° with respect to a tangent of said surface.
21. The printing group of claim 7 wherein each said groove is inclined at an angle between 30° and 60° with respect to a tangent of said circumference.
22. The printing group of claim 1 further including printing formes on said forme cylinder, said printing formes including ends aligned along said forme cylinder.
23. The printing group of claim 7 further including a second pair of cylinders including a second transfer cylinder and a cooperating second forme cylinder, said second transfer cylinder being engageable with said at least one transfer cylinder.
24. The printing group of claim 1 further including a counter-pressure cylinder, said at least one transfer cylinder being engageable with said counter-pressure cylinder.
25. The printing group of claim 7 further including a counter-pressure cylinder, said at least one transfer cylinder being engageable with said counter-pressure.
26. The printing group of claim 7 wherein adjacent ones of said at least three blankets are circumferentially offset from each other.