Two-arm lever 1 rotates about fixed axis A and periodically engages pins a of pin wheel 2 which rotates about fixed axis B. Pin wheel 2 has ratchet teeth b which are engaged by pawl 3. Pawl 3 turns about fixed axis C and prevents counterclockwise rotation of wheel 2. The transmission ratio from lever 1 to wheel 2 is i₁₂=ω₁/ω₂=z₂/2 where ω₁ and ω₂ are the angular velocities of lever 1 and wheel 2, and z₂ is the number of pins a. Lever 1 and wheel 2 rotate in opposite directions.
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