Intermittent mechanism

An intermittent mechanism or intermittent movement is a device or movement which regularly advances an object, web, or plastic film and then holds it in place. This process is commonly used in industry and manufacturing.

This motion is critical to the use of film in a movie camera or movie projector, allowing for a series of still images to be recorded or projected one after the other. When combined with a shutter mechanism, the still images appear as an uninterrupted moving image, due to a phenomenon called persistence of vision.

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