Printing – Printing members – Rolling contact
Patent
1999-11-02
2000-12-19
Hilten, John S.
Printing
Printing members
Rolling contact
101368, B41F 1308
Patent
active
061614785
ABSTRACT:
A printing cylinder assembly adapted to be removably supported on a hydraulically operable mandrel having means to hydraulically apply radially outward forces is disclosed. The printing cylinder assembly has a generally cylindrical coated printing cylinder having two open end portions, and a generally annular sleeve positioned within each end portion and in shrink fit relation therewith. Each annular sleeve has a generally annular groove therein and at a location which corresponds to the general location of application of the radially outward forces when the cylinder is positioned on the mandrel. Radially outward forces are hydraulically developed by the mandrels and are transmitted to the cylinder through the annular sleeves to retain the cylinder and the mandrel as an integral unit. The grooved portion of each annular sleeve defines two adjacent annular stepped portions wherein the grooved portion has a greater flexibility in the radial direction than the adjacent stepped portions. The grooved portion of the annular sleeves expands radially under the hydraulically developed expansion forces and redistributes the expansion forces through the stepped regions into the cylinder in a generally distributed manner. In the preferred embodiment the grooved portion and the two adjacent annular stepped regions define a cross-sectional profile having a generally rectangular outline while in an alternative embodiment, the grooved region has a generally dovetailed outline. Also, in the preferred embodiment the sleeve is received in a constant diameter bore while in an another embodiment the sleeve is received in an axially tapered opening. The cylinder coating in the preferred embodiment is an analox coating.
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Hilten John S.
Nguyen Anthony H.
The Holdrite Co., Inc.
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