Plate cam 1 rotates about fixed axis A. Follower 2 oscillates about fixed axis B and carries roller b which rolls along the contour of cam 1. Link 3 is connected by turning pairs K and L to follower 2 and to link 4 which turns about fixed axis C. Link 5 is connected by turning pairs N and M to link 4 and to link 6 which turns about fixed axis F. Link 7 turns about fixed axis E and carries roller 9 which rolls along link 5. Link 8 with shoe a is connected by turning pairs K and H to link 7 and to link 11 which turns about fixed axis D. When cam 1 turns, shoe a of link 8 descends to the stack of paper and clamps it. Rollers 9 and b are held in contact with link 5 and cam 1 by spring 10.
$3291$CmL,FD$