Cam 1 rotates about fixed axis A and has three symmetrically located identical profiled lobes a. Stamp 2 reciprocates in fixed guides B-B and has flat lug b a long whose surface the working surfaces of lobes a slide while the stamp is being raised. When a lobe a turns out of engagement with lug b, the stamp drops and is then raised again by the next lobe a engaging lug b.
$3170$SmC,FD$