Cam 2 rotates about fixed axis A and has four fingers a. Ram (follower) 1 reciprocates with ram die 4 in fixed guide B and carries roller 3 which periodically engages fingers a of cam 2. As each finger turns out of contact with roller 3, ram 1 and die 4 drop by gravity and strike billet 5 which lies on fixed anvil die 6. In one cycle, ram 1 has four periods in which it is raised and four periods in which it drops.
$3146$SmC,HP$