When the vacuum pump is switched on, piston a in the vacuum cylinder begins to travel to the left due to atmospheric pressure. Piston rod 1 turns link 2 counterclockwise about fixed axis B. At this, shaped link 3 drops and pawl 4, pivoted to link 5 and resting with its roller 6 on link 3, engages and turns ratchet wheel 7 together with its shaft A. This shaft transmits motion to a platform with a stack of paper, raising the platform. Link 5 is oscillated about shaft A by crank 9 through connecting rod 8. Link 3 is returned to its upper position by links 10 and 11 which are actuated by cam 12, keyed on main shaft D of the stacker and rotating about a fixed axis. Follower 11 turns about fixed axis E and carries roller 13 which rolls along the contour of cam 12. Spring 14 tends to hold link 2 in the vertical position.
$3283$CmL,FD$