Printing – Printing members – Rolling contact
Patent
1980-11-18
1983-06-07
Fisher, J. Reed
Printing
Printing members
Rolling contact
29113R, B41F 1310
Patent
active
043865666
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 on its journal is a relieved zone defining an annular hydraulic chamber. An axial inlet section which opens into the free end of each journal receives a piston and a tool-operated piston screw, the inlet section leading into an internal duct in axial alignment therewith having a lateral branch communicating with the hydraulic chamber, the duct and chamber being filled with hydraulic fluid. 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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Ebert Michael
Fisher J. Reed
Mosstype Corporation
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