Re-wind mechanism with profiled cam-potentiometer

Claim 1

Means for re-winding an elongated treated web onto a winding core from a treating station, and comprising: a. web handling means for establishing and maintaining a slack segment in said elongated web downstream from said web treating station; b. take-up roll means including frame means for mounting and driving means for rotating a winding core to re-wind said treated web onto said winding core; and c. means for applying tension to said web between said slack loop segment and said winding core; d. said take-up roll means including motor means for rotating said winding core, control means for driving said motor means at a certain predetermined arcuate rate responsive to the immediate diameter of said core, sensing arm means having one end mounted for pivotal arcuate rotation on said frame means and having the free end thereof adapted for running contact with that portion of said treated web forming the outer periphery of said web on the winding core to determine the immediate composite diameter thereof, and profiled cam means secured to said sensing arm means and having a cam face, and cam follower means arranged in contact with the cam face of said cam means, said cam face having a profile to provide linear motion in said cam follower means relative to said frame means with said linear motion being proportional to the reciprocal of the immediate composite diameter of said winding core and said re-wound web, means coupling said cam follower means to said control means, said control means being responsive to said linear motion to maintain said motor means at said predetermined arcuate rate.