Cam 2 rotates about fixed axis A and has two profiled lobes a. Ram (follower) 1 reciprocates with ram die 6 in fixed guide B and carries roller 3 which rotates about axis C. Ram 1 is raised when roller 3 engages one of lobes a of cam 2, compressing spring 4. As each lobe a turns out of contact with roller 3, ram 1 and die 6 drop by gravity and the action of spring 4 and strike billet d which lies on fixed anvil die 5. In one cycle, ram 1 has two periods in which it is raised and two periods in which it drops.
$3147$SmC,HP$