Cam 1 rotates about fixed axis A and has groove a with side surfaces b and d of different profiles. Follower 2 oscillates about fixed axis B and carries two nonsymmetrical located rollers 3 and 4. Positive motion is achieved because roller 3 rolls along side surface b of groove a and roller 4 along side surface d. The profiles of surfaces b and d are the envelopes of the positions of rollers 3 and 4 in the motion of follower 2 with respect to cam 1.
$3006$SmC,3L$