Crank 1 rotates about fixed axis F. Connecting rod 2 is connected by turning pairs L and K to crank 1 and to slider 3 which moves along fixed guides a-a. Link 2 has sector D at one end. Frame 4 turns about axis A of slider 3 and has catch B which slides along edge C of sector D . Edge C is bent into the shape shown by the view facing arrow 1. When crank 1 rotates about axis F, slider 3 reciprocates. Frame 4 turns about axis A and reciprocates with slider 3 . Catch B of frame 4 engages the stepped edge C of sector D . In the down-stroke of slider 3 , sector D advances claw E , mounted on frame 4 to insert it into a perforation of the film which it moves downward. In the up-stroke of slider 3 , sector D withdraws claw E from the perforation.
$1653$SC,OC$