Crank 1 rotates about fixed axis C. Connecting rod 2 is connected by turning pairs D and E to crank 1 and to slider 3 which moves in fixed guides p-p. Link 2 has sector A at one end. The edge B of sector A is bent into the shape shown by the view facing arrow 1. Pin 4 slides in a rectangular hole of slider 3 and has a slot which engages edge B. When crank 1 rotates about axis C, slider 3 reciprocates. Pin 4 travels together with slider 3. In the down-stroke of slider 3, sector A advances pin 4 to insert its claw into a perforation of the film which it moves downward. In the up-stroke of slider 3, sector A withdraws pin 4 from the perforation.
$1652$SC,OC$