Input: the bue gear.
Its original number of teeth Z1 = 20
Output: the green gear
Its original number of teeth Z1 = 24
When the blue makes 1 revolution, the green turns two times and pauses two times.
The arcs on both gears keep the output gear immobile during its pause period.
The yellow star, red spring and two pink pins are used for reducing shock. Before teeth engagement, the pink pin pushes the star. The latter pulls the output blue gear though the spring and gives the output a low initial speed.