A cam mechanism according to the present invention is constructed in such a way that a face cam is secured to a rotary shaft which is rotated by a motor, and a pressing cam, which is movable along the rotary shaft, presses a cam follower pin toward a cam face of the face cam. The press cam has a cam...http://www.google.es/patents/US6069747?utm_source=gb-gplus-sharePatente US6069747 - Cam mechanism
