Cam 1 reciprocates along fixed guides a-a. Portion cb of its contour is along a parabola and portion bd is along any arbitrary convex curve. Follower 2 oscillates about fixed axis A and it knife-edge f slides along the contour of c am 1. When knife-edge f slides along parabolic portion cb. Follower acceleration is approximately constant. Owing to the equal lengths ce and ed of the rise and return portions of cam 1, the rise and return strokes of follower 2 are of the same duration. Follower 2 is held in contact with cam 1 by spring 3.
$3023$SmC,3L$