ROLL-UNWINDING DEVICE FOR AUTOMATICALLY CHANGING ROLLS AT FULL RUNNING SPEED

摘要

In a roll-unwinding device two pair of support arms are mounted on a support frame for automatically changing rolls of a web-type material for the continuous delivery of the material as it is unwound from successive rolls. The support arms are disposed between laterally arranged support elements of the frame and the support arms of one pair are laterally spaced from the support arms of the other pair. The support arms are pivotally mounted on the frame for movement between a plurality of positions. To afford the movement of two different rolls between the unwinding and replacement positions the length of one pair of support arms between its pivot axis and its roll support axis is different from the length of the other pair of support arms between its pivot axis and roll support axis. Hydraulic piston assemblies or mechanical devices are mounted on the support frame and connected to the support arms for pivoting the support arms through limited pivot angles between the various positions assumed by the rolls in the operation of the device.