Roll feed system used in sheet metal work installations

摘要

The roll feed system is intended for stepwise transport of sheet-metal strip into machines performing a sequence of operations on the strip and finally sepg. it into individual components. It includes a bottom driven roll (12) and a freely rotating top roll (18) positioned and loaded by a hydraulic cylinder unit (19). The system includes a valve arrangement (32) with a pressure summing stage (33) and a switching valve (42), which allows - by means of appropriate pressures fed in the cylinder spaces (26,31) - the top roll to be actuated during various stages of centring and transport of the workpiece material (14).