Printing – Work supporting members – Grippers
Patent
1993-07-06
1995-02-21
Burr, Edgar S.
Printing
Work supporting members
Grippers
101410, 271277, B41F 2110
Patent
active
053906012
ABSTRACT:
Gripper control for sheet grippers on a sheet-guiding cylinder or the like in a printing press, wherein a stationary pressure generator for a pressure medium is connected by means of a coupling, through the intermediary of a motor-actuated servo-valve, to a sheet-gripper actuating system disposed on the cylinder or the like and, through a control system, being acted upon by the pressure medium in time with an operating cycle of the printing press, includes a piston-cylinder unit forming part of the actuating system, a displacement-measuring system connected to the piston-cylinder unit, respective elements for pivotally connecting the piston-cylinder unit, at one end thereof, to the sheet-guiding cylinder or the like and, at the other end thereof, to a lever connected to the sheet gripper, the control system including a programmable control computer connected by measuring lines to the displacement-measuring system and, via a position-control loop, being capable of controlling a motor-actuated positioning of the servo-valve as a function of relative positions of piston and cylinder of the piston-cylinder unit, taking into account the printing-press speed and forces generated by moving masses.
REFERENCES:
patent: 4003310 (1977-01-01), Decker, II
patent: 4127265 (1978-11-01), Wirz et al.
patent: 4375190 (1983-03-01), Quinci et al.
patent: 4458893 (1984-07-01), Ruh
patent: 5184554 (1993-02-01), Merkel et al.
patent: 5186105 (1993-02-01), Emrich et al.
Japanese Patent Abstract JP 59073951 (Ishida Masaaki) Apr. 26, 1984.
Fricke Andreas
Thunker Norbert
Bennett Christopher A.
Burr Edgar S.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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