Input: large gear (teeth-uncompleted), rotating continuously.
Its number of teeth (teeth-completed) Z1 = 35
Its number of remained teeth: 4 + 4 + 9
Its number of cut-off teeth: 6 + 6 + 6
Tops of two end teeth of each tooth group are cut off for meshing start.
Output: small gear of 20 teeth rotating interruptedly.
1 revolution of the input corresponds to 1 revolution of the output.
In one revolution the output turns 90 deg., pauses, turns 90 deg., pauses, turns 180 deg., pauses.
The output gear is kept immobile during its pause stages thanks to no teeth sector of the input gear.