Lever 2 is connected by turning pair B to link 1 and slides in guide b of guiding link 4 which turns about fixed axis C. Ratchet wheel 3 rotates about fixed axis D. When link 1 rotates about fixed axis A, lug a of lever 2 turns ratchet wheel 3 intermittently counterclockwise. In one complete revolution of link 1, lever 2 turns wheel 3 through the angle α=360°/z where z is the number of teeth on ratchet wheel 3.
$1806$LR,5L$