A Contribution to the Synthesis of a Trihedral Conjugate Cam

Abstract

A trihedral conjugate cam is a triple mechanism with forced constraint between the driving link and the driven link, whose cam active surface is formed from circular arcs connected to each other and the active surface of the driven link is created from two parallel planes. This mechanism is simple as to its design and it is often used for generating a motion with two rest positions, however, its disadvantage is unsuitability for higher working velocities caused by the discontinuous curvature of the cam active surface. Those discontinuities can be eliminated by changing law of motion when preserving the forced contact of the single active cam profile with the driven link. In the paper there are given the conditions for functions meeting the mentioned requirements. The properties of this solution are illustrated by comparing with the original cam with circular arcs.