Face cam 1, rotating about fixed axis A, has a cam profile of which portion abc is along a circular arc whose centre is at axis A. Ratchet wheel 3 is turned intermittently about fixed axis D by pawl 4 which is connected by turning pair B to lever 2. Lever 2 turns about fixed axis C and has roll E which is the follower of face cam 1. When roll E is in portion abc of the cam profile, lever 2 is at rest. In portion cd, pawl 4 turns ratchet wheel 3. In portion da, the pawl slides back to engage the next tooth.
$1803$LR,5L$