Plate cam 1 rotates about fixed axis A. Follower 2 turns about fixed axis B and carries roller 6 which rolls along the contour-complex curve a-a of cam 1. Pawl 4 turns about axis C of follower 2 and engages the teeth of ratchet wheel 5 which rotates about fixed axis D. When cam 1 rotates, ratchet wheel 5 rotates intermittently with dwells whose number and length depend upon the profile a-a of cam 1. Roller 6 is held against cam 1 and pawl 4 against ratchet wheel 5 by spring 3.
$3348$CR,D$