Clamping device for clamping printing plates on the plate cylind

Details Clamping device for clamping printing plates on the plate cylind Clamping device for clamping printing plates on the plate cylind

1983-01-07

1984-12-25

Sewell, Paul T.

Printing

Flexible-sheet-securing devices

B41F 128

Patent

active

044896530

ABSTRACT:
A clamping device for thin flexible printing plates has a tensioning rail at the trailing wall of a wide longitudinal groove in the plate cylinder. The tensioning unit is mounted for axial and peripheral adjustment on a support of "L" cross-section having a first leg seated with respect to the bottom of the groove and a second leg presenting an upstanding reference surface interposed between the tensioning rail and the trailing wall of the groove. A set of tensioning springs recessed in the tensioning rail bear against the reference surface and apply peripheral tension to the plate. A spring detent latches the tensioning rail temporarily against the reference surface, overcoming the tensioning springs while the trailing edge of the plate is being gripped. The spring detent is mounted upon and movable with the support. Screws having a plurality of selectable holes anchor the support in a series of peripheral positions for accommodation of plates of different length. A plurality of jack screws threaded into the tensioning rail have tips which bear against the reference surface on the support for removing slack from the plate and for tensioning of the plate about the surface of the cylinder.

REFERENCES:
patent: 1270779 (1918-07-01), Brower
patent: 1948038 (1934-02-01), Kast
patent: 3156184 (1964-11-01), Shank
patent: 3460443 (1969-08-01), Sarka et al.
patent: 3474727 (1969-10-01), Kampf
patent: 3858512 (1975-01-01), Simeth
patent: 3884147 (1975-05-01), Abendroth
patent: 3892179 (1975-07-01), Jahn
patent: 3926118 (1975-12-01), Preuss
patent: 3973496 (1976-08-01), Cerny et al.
patent: 4100854 (1978-07-01), Fujishiro et al.
patent: 4259904 (1981-04-01), Metje

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