Methods Used
The intermittent mechanism must be employed in concert with a rotating shutter which blocks light transmittance during the motion of the film and allows light through while the film is held in place usually by one or more registration pins. The intermittent mechanism can accomplished in many ways, but most often, it is done with sprocket wheels, claws, or pins coupled to the camera or projector drive mechanism.
In movie theater projectors, the intermittent movement is often produced by a Maltese cross mechanism.
However, in a movie camera, it is done through a process by which a shutter opens exposing the film negative to light for a split second (the standard for regular motion in North America is 1/48 of a second), then the shutter closes blocking light from reaching the negative. Once the shutter is completely closed, a claw pulls down the next frame of negative film by the sprocket holes into the film gate and the process begins again. A movie projector works in a similar way.
Read more about this topic: Intermittent Mechanism
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