Cam 1 rotates about fixed axis A and has cam groove a whose pitch curve has point C of self-intersection. Follower 2 reciprocates in fixed guide B and carries pivoted lens-shaped member 3 which slides along groove a. In one cycle of motion, equal to two revolutions of cam 1, the follower has two rises with different types of motion and two returns with different types of motion. Follower 2 has dwells while member 3 slides along circular concentric portions d-d and e-e of groove a. At point C of self-intersection, member 3 passes from one part of the groove to the other due to its lens shape.
$2980$SmC,3L$