Cam 1 rotates about fixed axis A and its contour is along an ellipse. Two symmetrically located followers, 2 and 3, oscillate about fixed axes B and C, and carry rollers 5 and 6 which roll along the cam surface. Followers 2 and 3 are connected by spring 4 which holds rollers 5 and 6 in contact with cam 1. Owing to the elliptical contour of cam 1, followers 2 and 3 have the same type of motion but displaced by a phase angle of 180°.
$3062$SmC,4L$