Driving pulley 1 and driven lever 3 rotate about fixed axis A. Pin a of pulley 1 enters slot b of double-arm lever 2 which has collar k encircling fixed round eccentric c. Pin d, on the other arm of lever 2, enters slot e of driven lever 3. When pulley 1 rotates at constant angular velocity, driven lever 3 rotates at variable angular velocity.
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