Hydraulically-actuated mandrel for a demountable printing cylind

Details Hydraulically-actuated mandrel for a demountable printing cylind Hydraulically-actuated mandrel for a demountable printing cylind

1980-10-06

1983-05-17

Fisher, J. Reed

Printing

Printing members

Rolling contact

29113R, B41F 1310, B41F 1320

Patent

active

043834833

ABSTRACT:
A mandrel assembly for a demountable printing cylinder, the assembly including a tube receivable within the cylinder and having journals joined thereto at either end. Encircling each journal is an expansible sleeve, the sleeves fitting within the end heads of the cylinder when it is mounted on the mandrel assembly. Below each sleeve is a relieved journal zone defining an annular hydraulic chamber. A lateral bore in each journal receives a piston and a tool-operated piston screw, the bore leading into an internal duct having branches communicating with the hydraulic chamber. When the piston screw is turned in to advance the piston, the resultant hydraulic pressure is applied through the hydraulic chamber against the inner wall of the sleeve, causing the sleeve to expand and grip the cylinder head thereby locking the cylinder to the mandrel assembly. When the piston screw is turned out, the pressure is released to permit removal of the cylinder.

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