Cam 1 reciprocates along fixed guides a-a. Portion cb of its contour is along a parabola and portion bd is along some arbitrary convex curve. Follower 2 oscillates about fixed axis A and its knife-edge f slides along the contour of cam 1. When knife-edge f slides along parabolic portion cb, follower acceleration is approximately constant. Owing to the different lengths ce and ed of the rise and return portions of cam 1, the rise and return strokes in the oscillation of follower 2 are of different durations and at different velocities. Follower 2 is held in contact with cam 1 by spring 3.
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