Plate cam 1 rotates about fixed axis B. Follower 2 reciprocates in fixed guides D-D and carries roller 6 which rolls along the contour of cam 1. Link 3 is connected by turning pair A to follower 2 and has gear segment 5 which meshes with fixed rack 4. When cam 1 rotates, point K of link 3 describes a prolate cycloid. The profile of cam 1 consists of two Archimedean spirals so that points A and K travel at constant velocity. Roller 6 is held in contact with cam 1 by spring 7.
$3314$GrC,ML$