The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step. The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps.
It is used in projectors to advance the film in jumps. Keep the film stable while a shutter is open to project it, then close the shutter, jump to the next frame and open the shutter.
Reference:http://kmoddl.library.cornell.edu/tutorials/10/
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