Printing – Rolling contact machines – Rotary
Reexamination Certificate
1999-11-24
2001-11-13
Fulton, Christoper W. (Department: 2859)
Printing
Rolling contact machines
Rotary
C101S481000, C101S485000, C033S614000
Reexamination Certificate
active
06314883
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to printing machines, and more particularly to an apparatus and a method for slip compensation of a printing-plate sleeve on the plate cylinder of a printing unit.
2. Description of the Related Art
DE 35 43 704 C2 shows a printing-plate sleeve which is secured onto the plate cylinder by means of a shrink fit. In a force-fitting connection of this type there is the risk that the printing-plate sleeve will rotate in the circumferential direction if the shrink fit is not sufficiently strong.
According to DE 44 12 873 A1, the printing-plate sleeve is provided on its inner wall with a guide element, for example a web, which extends in the direction of the longitudinal axis of the sleeve. When the sleeve is mounted, the guide element projects into a groove in the plate cylinder. In this way, the printing-plate sleeve is positively secured against rotation. However, this type of safeguard requires a special shape of the sleeves.
SUMMARY OF THE INVENTION
An object of the invention is to provide an apparatus and a method which counteracts the rotation of a printing-plate sleeve on a plate cylinder without requiring a positive fit between the two.
This and other objects of the present invention are achieved by virtue of the individual drive of a printing unit, a rotatable printing-plate sleeve which can be rotated back, together with the plate cylinder, into a desired position. This therefore provides a way to mount printing-form sleeves on plate cylinders with a force fit, without running the risk of rejects or increased costs in terms of quality arising from slippage of the plate sleeves. The printing-plate sleeves can be produced cost-effectively.
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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Siemens-Registerregelung; Von Karl Fischer Und Hildegard Schaufler; Feb., 1995.
Cohen & Pontani, Lieberman & Pavane
Fulton Christoper W.
MAN Roland Druckmaschinen AG
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