Printing – Rolling contact machines – Rotary
Reexamination Certificate
2000-04-24
2001-11-13
Eickholt, Eugene (Department: 2854)
Printing
Rolling contact machines
Rotary
C101S247000, C101S477000, C101S220000
Reexamination Certificate
active
06314882
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a printing units and more particularly to a printing unit for a web-fed rotary printing machine.
2. Description of the Related Art
German Application No. DE 195 34 651.3 shows a printing unit for indirect printing, in which the distance between the transfer and form cylinders is adjustable. This enables printing to be carried out with cylinders of variable circumference (i.e., different diameters). The diameter of the transfer and form cylinders is varied by equipping the same with sleeves having different diameters. For distance adjustment, carrier plates are guided on the side walls. The printing unit cylinders are mounted directly or indirectly in said carrier plates. A stable wall design is necessary for this purpose. Adjustment is carried out by means of working cylinders or spindle mechanisms. The side mountings holding the cylinder are moved apart sideways on the sidewalls to an extent sufficient to allow the sleeves to be exchanged.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a printing unit having a slide mounting which allows adjustment of the gap between the cylinders with a change in diameter so that the slides are not interfered with when the sleeves are exchanged, while preserving format variability.
This and other objects are achieved in a generic printing unit according to the invention. According to an embodiment of the present invention, the slides and the support mountings are movable by servo motors to permit access to the end of the cylinder and removal of a sleeve from the cylinder without interference. In all these situations, a multiplicity of components that are unchanged are employed. The result is that the printing unit can be cost-effectively mass-produced in large quantities. Likewise, subassemblies for the production of printing forms in the printing unit can easily be approached by the form cylinders and subassemblies, for example inking units, can easily be placed on the slide. There is no need to provide side wall orifices in order to change sleeves which are located on the printing unit cylinders.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
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Cohen & Pontani, Lieberman & Pavane
Eickholt Eugene
MAN Roland Druckmaschinen AG
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