method for controlling a querschneiders and device for implementation of the procedure

摘要

At a transition between first and second sets of registration marks on a web, a target is applied adjacent the initial mark of the second set. The target is sensed and tracked electronically to a shear station. During an order change or a roll-to-roll change within an order, the web is automatically severed transversely by the shear at the transition between the sets of marks, and the target is tracked to a station intermediate the shear and the cut-off machine. The cut-off machine knives "crop" cut the web at the target and thereafter cut the web automatically in synchronization with the second set of marks. Operation of the cut-off machine knives in the cut-to-mark mode is maintained without loss of synchronization across the transition in the web. Operator intervention is eliminated, and scrap is minimized.