Geneva Cam 12 Point .
The Geneva mechanism converts smooth rotation into an intermittent step motion.
The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation movement into intermittent rotary motion.
The rotating drive wheel is usually equipped with a pin that reaches into a slot located in the other wheel (driven wheel) that advances it by one step at a time. The drive wheel also has an elevated circular blocking disc that locks the rotating driven wheel in position between steps.