Cylinder arrangement for web-fed rotary printing press

Details Cylinder arrangement for web-fed rotary printing press Cylinder arrangement for web-fed rotary printing press

1999-10-18

2001-07-24

Hilten, John S. (Department: 2854)

Printing

Rolling contact machines

Rotary

C101S218000

Reexamination Certificate

active

06263793

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a cylinder arrangement for rotary printing presses.
DESCRIPTION OF THE PRIOR ART
It is known to arrange cylinders in print units of web-fed rotary printing presses, which cylinders are connected, fixed against relative rotation, with a drive gear wheel and whose gear wheels are driven in a drive gear wheel train.
It is disadvantageous here that in the course of the engagement of the gear wheels with each other, play in individual tooth flanks is created, the sum of which prevents a symmetrical position of the angles of rotation of individual cylinders in respect to each other.
SUMMARY OF THE INVENTION
The object of the present invention is based on producing a cylinder arrangement for a print unit of a rotary printing press.
In accordance with the present invention, this object is attained by the provision of a cylinder arrangement of a bridge printing unit that includes two blanket cylinders and two plate cylinders. Each cylinder carries a drive gear wheel. These drive gear wheels are in engagement with each other in a non-printing position. The plate cylinders are rotatable in opposite directions, but through corresponding angels of rotation between non-printing and printing positions.
The advantages which can be achieved by means of the present invention consist, in particular, in that it is possible to work on the cylinders, which are in a definite play-compensated angle of rotation position, at the same time, so that previous setup times of the print unit can be reduced. This applies particularly in connection with the assembly and disassembly of flexible printing plates, whose beveled edges must be either positioned in small slits in the cylinder circumference, or removed from these small plate-beveled edge receiving slits.


REFERENCES:
patent: 4369705 (1983-01-01), Gelinas
patent: 4398464 (1983-08-01), Morbitzer et al.
patent: 4696229 (1987-09-01), Bezler et al.
patent: 4815377 (1989-03-01), Skiera
patent: 4833982 (1989-05-01), Liebert et al.
patent: 5937755 (1999-11-01), Preuss et al.
patent: 5979317 (1999-11-01), Singler
patent: 195 40 573 C1 (1998-11-01), None
patent: 0193012 A2 (1986-02-01), None

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