Sheet acceleration system i.e. pre-gripper, for sheet-fed printing machine, has piezoactuator e.g. electric motor, connected with shaft to produce moment counteractive or compensative to torsion- and bending vibrations of parts of system

摘要

The system (10) has a shaft (12) actuated to change a space position of grippers (14). A cam mechanism has a piezoactuator (20) e.g. controlled or regulated electric motor, connected with the shaft to produce a moment counteractive or compensative to torsion- and bending vibrations of parts of the system. The system is arranged in a feeder or in a printing unit of a sheet-fed printing machine so that printing sheets are transported from the feeder into the printing unit by the system. The electric motor is provided at a free end of the shaft.