Cylinder cam 1 rotates about fixed axis A-A and has helical groove a with right- and left-hand portions of constant pitch. Follower 2 oscillates about fixed axis B and carries pin 3 which slides along groove a. When cam 1 rotates at constant speed, follower 2 oscillates at constant angular velocity. At its extreme positions, follower 2 is automatically reversed, being switched over from right- to left-hand portions of the groove or vice versa. This provides for continuous motion of follower 2. Axis B of follower oscillation is perpendicular to, but does not intersect, axis A-A. The plane of follower oscillation is parallel to axis A-A.
$3061$SmC,3L$