Input: beige face gear (tooth-uncompleted) rotating continuously.
Output: green gear (tooth-uncompleted) that performs interrupted rotation. In 1 input revolution it quickly turns 90 deg. (with the support of the flat spring) and dwells (thanks to flat (no teeth) section of the beige face gear).
The original green gear (tooth-completed) has 16 teeth.
Increase the beige gear diameter for a larger dwell/motion time ratio of the output.