Cam 1 rotates about fixed axis A and has profiled groove a in which roller 2 slides and rolls. Follower 3 reciprocates in fixed guide b and carries roller 2 which rotates freely about axis B. Axis Bx of follower motion passes through axis A of cam rotation. Positive motion is achieved because roller 2 is confined between side surfaces c and d of groove a.
$2988$SmC,3L$