Disk 1 is keyed to shaft 7, rotates about fixed axis A and carries guides a-a along which lobe member 2 can slide. Member 2 has axial slot b through which the end of shaft 7 passes. Member 2 is held in its central position by springs 4. Roller 3 rotates freely about fixed axis B. Follower 6 reciprocates in fixed guide C and carries roller 5 which rolls along the working surface of lobe member 2 and the contour of disk 1. When shaft 7 with disk 1 rotates, lobe d of member 2 passes over roller 3, displacing member 2 in guides a-a by overcoming the resistance of a spring 4. At this, lobe e of member 2 contacts roller 5 and raises follower 6.
$3078$SmC,ML$