Gripper control for sheet grippers on a sheet-guiding cylinder or the like in a printing press

US5390601A · kind A · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Andreas Fricke · Eberbach, DE
• Norbert Thunker · Weinheim, DE

Key dates

• Filing date: Jul 6, 1993
• Grant date: Feb 21, 1995
• Expiry date: Jul 6, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H5/14
• WIPO field: Handling
• WIPO sector: Mechanical engineering

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 movin…