Eccentric 1 rotates about fixed axis A. Pawl 2 has collar b encircling round eccentric 1. Ratchet wheel 3 rotates about fixed axis B. When eccentric 1 rotates counterclockwise, tip a of pawl 2 turns ratchet wheel 3 intermittently in the same direction. In one complete revolution of eccentric 1, pawl 2 turns wheel 3 through the angle α=360°/z, where z is the number of teeth on ratchet wheel 3.
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