Rachet wheel 3 rotates about fixed axis C. Cam 1 rotates about fixed axis A and imparts motion to roll a which rotates about axis B of lever 2. Spring 5 holds roll a against cam 1. When cam 1 rotates clockwise, lever 2 oscillates about fixed axis D and pawl 4 turns ratchet wheel 3 intermittently. In one complete revolution of cam 1, wheel 3 is turned through the angle α=360°/z where z is the number of teeth on ratchet wheel 3.
$1805$LR,5L$