Cam 1 turns about fixed axis A and has profiled groove a-a. Follower 2 reciprocates in fixed guide b and carries roller 3 which rotates freely about axis B and slides and rolls along groove a-a. Positive motion is achieved because roller 3 is confined between side surfaces d and e of groove a-a. When cam 1 oscillates, follower 2 reciprocates.
$2990$SmC,3L$