A Constant-Torque Friction Clutch for Film Take-Up

William Hotine

An analysis of fractional take-up devices in general use discloses the reasons for their failure or improper operation. An improved friction clutch is described and analyzed, which embodies means for canceling the effect of a varying coefficient of friction encountered at variable slip speeds, thus maintaining a constant torque at the take-up spindle. Automatic declutching occurs when the load exceeds the amount of torque transmitted, thus protecting the film from excessive tension, and eliminating declutching levers and ratchets when rewinding. The novel construction enables bidirectional operation, both in direction of rotation and in direction of transmission of torque.

Print ISSN
Published
1942-03
Content type
Original Research
DOI
10.5594/J09918