Cam 1 rotates about fixed axis C and has a contour composed of circular arcs of radii R and r, described from points A, B and C. These points are the vertexes of a triangular figure consisting of three arcs CA=AB=BC of radius R-r. Follower 2 reciprocates in fixed guides a-a and has yoke e consisting of two flat faces b with the distance R+r between them. Follower 2 has long dwells at its extreme positions. Positive motion is achieved because cam 1 is of constant diameter (R+r) equal to the distance between faces b (breadth) of yoke e.
$3003$SmC,3L$