Cam 1 rotates about fixed axis A and oscillates lever 2 which turns about fixed axis B. Connected to lever 2 by turning pair D is pawl 3 which engages ratchet wheel 4. Flat spring 5 holds lever 2 against cam 1. The angle of oscillation of lever 2 is limited by stop a. When cam 1 rotates about axis A, lever 2 is oscillated between its upper and lower positions about axis B. In the down stroke of the lever, pawl 3 turns ratchet wheel 4 by one tooth about fixed axis C.
$1804$LR,5L$