Printing unit and a rotary roller printing press
A printing unit is comprised of at least two pairs of two cylinders each. The two cylinders in each pair are a transfer cylinder and a forme cylinder. The transfer cylinder and the forme cylinder are each embodied with a width sufficient for printing six newspaper pages arranged axially next to each other. The transfer cylinder of each pair cooperates with a counter-pressure cylinder, that is embodied as a satellite cylinder to form a printing head in a so-called print-in-place arrangement.
1. A printing unit of a web-fed rotary printing press comprising:
at least first and second pairs of two cylinders, each of said two cylinders in each of said at least first and second pairs of two cylinders including a transfer cylinder and an associated forme cylinder, each said transfer cylinder and each said associated forme cylinder having a width for imprinting six newspaper pages arranged axially side-by-side;
at least one dressing on each said transfer cylinder, said at least one dressing having first and second dressing ends;
a shell surface on each said transfer cylinder;
at least one axially extending dressing end receiving opening in said transfer cylinder shell surface, said first and second dressing ends being receivable in said at least one dressing end receiving opening;
a shell surface on each said forme cylinder, each said forme cylinder shell surface having a circumferential length of two vertical newspaper pages;
first and second axially extending printing forme end receiving channels in said shell surface of each said forme cylinder, each said printing forme end receiving channel extending axially over said six newspaper page width of said forme cylinder, said first and second axially extending printing forme end receiving channels being spaced from each other in a circumferential direction on said shell surface of each said forme cylinder;
a plurality of printing formes on each said forme cylinder and arranged axially side-by-side on plurality of sections of said shell surface of each said forme cylinder and at least two of said plurality of printing formes being arranged one behind the other in said circumferential direction of each said forme cylinder;
at least one drive motor for each of said at least first and second pairs of said cylinders, each said drive motor driving its pair of cylinders independently; and
at least one printing forme pressing device having six first pressing roller elements associated with at least one of said forme cylinders, said six first pressing roller elements being movable independently of each other and each being engageable with one of said six printing formes of said associated one of said forme cylinders during rotation of said associated one of said forme cylinders.
2. The device of claim 1 wherein said transfer cylinders act together and form a double print position in a print-on position.
3. The device of claim 1 further including a satellite cylinder acting with said two transfer cylinders.
4. The device of claim 1 wherein each said transfer cylinder has a barrel length of between 1850 mm and 2400 mm and has a circumference of between 850 mm and 1300 mm.
5. The device of claim 1 wherein each said transfer cylinder shell surface has three of said dressings arranged side-by-side in said axial direction.
6. The device of claim 5 wherein said three dressings are arranged circumferentially offset with respect to each other.
7. The device of claim 6 wherein each of said three dressings is offset by 180° with respect to its axially adjacent dressing.
8. The device of claim 1 wherein each said forme cylinder has at least three of said printing formes arranged side-by-side in said axial direction and two of said printing formes arranged in said circumferential direction.
9. The printing unit of claim 1 wherein said at least one printing forme pressing device includes at least one group of several of said pressing roller elements which can be moved independently of each other.
10. The printing unit of claim 1 wherein said six first pressing roller elements are aligned side-by-side in said axial direction of said associated one of said forme cylinders.
11. The printing unit of claim 1 further including printing forme holding devices in each said printing forme end receiving channel, said holding devices being actuated by a common actuating means.
12. The printing unit of claim 1 wherein each said printing unit is part of a web-fed rotary printing press.