Lever (driver) 1 rotates about fixed axis A. Slide 2 reciprocates vertically along fixed guides. When driver 1 rotates clockwise, it engages lug b of follower 2, raising the slide to the position shown by the dash lines. In this position, the slide is indexed by latch 3 whose lower lug d engages lug c of the slide. In the next revolution of driver 1 it turns latch 3 about fixed axis E so that it releases slide 2 which drops until lug 1 reaches pin 4.
$3088$SmC,ML$