Face cam 1 rotates about fixed axis B and has profiled groove a. Follower 2 turns about fixed axis A and carries roller 5 which rolls and slides along groove a. Links 6 and 7 are connected by turning pairs C and D to follower 2 and by turning pairs F and E to knives 4 and 3 which turn about fixed axis K. The lengths of the links comply with the conditions: E͞D=F͞C and K͞E=K͞F. When cam 1 rotates, follower 2 oscillates, opening and closing blades a and b of knives 3 and 4.
$3279$CmL,FD$