Cylinder cam 1 rotates about fixed axis A-A and has profiled groove a. Followers 4 and 5 reciprocate in fixed guides B-B and C-C, and carry rollers 2 and 3 which roll and slide along groove a. The axes of guides B-B and C-C are parallel to axis A-A. Thus followers 4 and 5 are raised and lowered simultaneously (one being raised and the other lowered), their motions being displaced by a phase angle corresponding to a half-revolution of cam 1.
$3068$SmC,4L$