Cam 1 rotates about fixed axis A. Punch 3 slides in fixed guide B. Plunger (follower) 2 reciprocates in fixed guide C and carries roller 5 which rolls alonfg the working surface of cam 1. Spring 4 is arranged between plunger 2 and punch 3. When cam 1 rotates, plunger 2 compresses spring 4 and strikes punch 3 which makes a hole in the stock.
$3167$SmC,FD$