Printing – Printing members – Plate mountings
Reexamination Certificate
1997-06-30
2001-04-03
Asher, Kimberly (Department: 2854)
Printing
Printing members
Plate mountings
C101S395000, C101S479000
Reexamination Certificate
active
06209455
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to a printing machine having a plate cylinder to which a printing plate can be attached on its outer surface, and more particularly concerns a friction-reducing layer between the surfaces of the printing plate and the plate cylinder.
BACKGROUND OF THE INVENTION
A conventional printing machine is described in DE 3,936,448 C1 corresponding to U.S. Pat. No. 5,154,120. In this conventional printing machine, a friction-reducing layer is provided comprising a foil arrangement having two foils placed one above the other between the plate cylinder and the printing plate. Each foil is coated with plastic such that one surface of the foil has a lower coefficient of sliding friction than the other surface. The foils are arranged such that the surfaces with the lower coefficient of sliding friction engage one another, thus allowing for displacement of the printing plate relative to the plate cylinder. As a result, the attachment and alignment adjustment of the printing plate on the plate cylinder is facilitated.
Because of the complex arrangement of foils associated with this convention printing machine, however, it is difficult to change the printing plate. Furthermore, the heat dissipation from the printing plate to the plate cylinder is adversely affected by the two foils. This results in a reduction of the temperature resistance of the printing plate.
OBJECTS OF THE INVENTION
Accordingly, it is the primary aim of the present invention to improve the ease of mounting and adjusting a printing plate on the outer surface of a plate cylinder in a printing machine.
It is a further object of the present invention to improve the heat transfer properties between the printing plate and plate cylinder in a printing machine.
A further object of the present invention is to improve the temperature resistance characteristics of a printing plate mounted on the outer surface of a plate cylinder in a printing machine.
All of these objects are realized in whole or part by one or more embodiments of the present invention. Other objects, as well as other inventive features of the present invention, will be apparent to one skilled in the art from the specification and appended claims.
BRIEF SUMMARY OF THE INVENTION
According to the invention, a friction-reducing layer in the nature of a sliding material is coated onto the outer surface of the plate cylinder. Alternatively, or in addition thereto, the friction-reducing layer may comprise a sliding material that is coated onto the underside of the printing plate.
REFERENCES:
patent: 3791644 (1974-02-01), DeMoore
patent: 4402267 (1983-09-01), DeMoore
patent: 5154120 (1992-10-01), Simeth
patent: 39 36 448 C1 (1991-04-01), None
Asher Kimberly
Leydig , Voit & Mayer, Ltd.
MAN Roland Druckmaschinen AG
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