Links 4 and 5 are connected by turning pairs F and E to rocker arm 3 and connecting rod 2 of four-bar linkage ABCD, and by turning pair K to each other. Link 4 has pin d sliding along slot e of link 6 which turns about fixed axis H. Slot f of link 6 actuates pin m of link 7 which slides in fixed guides q-q. When crank 1 rotates about fixed axis A, claw a of connecting rod 2 describes a connecting-rod curve in which claw a is inserted into a perforation of the film, advances the film and is withdrawn from the perforation. Claw b of link 7 is inserted into a perforation to prevent motion of the film while claw a is withdrawn.
$1395$LG,OC$