Input: yellow gear rotating continuously.
Output: blue gear rotating interruptedly.
For the yellow gear:
Its number of remained teeth Z1c = 12 (180 deg.)
Its number of teeth (teeth-completed) Z1 = 24
Its number of cut-off teeth Z1f = Z1 – Z1c = 12 (180 deg.).
There is an orange rim located in the place, where the teeth are cut off.
The number of the blue gear (teeth-completed) Z2 = 24.
It has two red triangular slots.
The rim and slots are for keeping the blue gear immobile during its dwell.
When the yellow makes 1 revolution, the blue makes an angle A = 1/2 revolution.
Alter Z1, Z1c and Z2 to get various values of A.