Unwind stand-roll brake

Abstract From the Canadian patent

A braking system for applying a controllable braking force to the support shaft of a film supply roll, wherein the braking force is proportional to the weight of film remaining upon the supply roll and wherein the braking, force decreases as the supply of film remaining on the supply roll decreases. The system utilizes a pair of brake yokes which are mounted on opposed sides of the frame of an unwind stand, with each brake yoke having a generally "U" configuration, and with the support shaft for the film supply roll being received within the "U" shaped member. The yokes are mounted upon rams which are controllably elevated, and when elevated a friction pad which lines the inner, periphery …