Noun
An animation of a Geneva mechanism.
Geneva mechanism (plural Geneva mechanisms)
(mechanics) A mechanism that translates a continuous rotation into an intermittent rotary motion, using an intermittent gear where the drive wheel has a pin that reaches into a slot of the driven wheel and thereby advances it by one step, and having a raised circular blocking disc that locks the driven wheel in position between steps.
English Wikipedia has an article on:Geneva mechanismWikipedia