Device for wrapping or. Back coils of the film in a sound film projector

摘要

A device for allowing rewinding of the film in a sound motion picture projector, wherein the drive sprocket intended for uniformly driving the film on the pick-up members of the sound track is idly mounted on its driven shaft, and a unidirectional joint is inserted between the shaft and the sprocket for connecting rigidly both parts in the forward direction of rotation and for allowing free rotation of the sprocket when the shaft rotates in reverse direction.