Film advance device for surveillance cameras

Abstract From the Canadian patent

A sequence camera for recording a series of images on a strip of photographic film employing a rotating shutter and an intermittent film advance mechanism. A motor drives the shutter and the film advance mechanism. The film advance mechanism utilizes a beater wheel with two protruding pins spaced unequally about the circumference and a spoke wheel with a plurality of spokes. As the motor drives the beater wheel, the pins intermittently engage the spokes of the spoke wheel, which, in turn intermit-, tently advances the film. The film is exposed by the shutter during the stationary period between advancements.