Gear 1 rotates about fixed axis A and meshes with gear 4 which rotates about fixed axis D. Links 5 and 6 are connected by turning pairs B and C to gears 1 and 4, and to each other by turning pair E. When driving gear 1 rotates, tip K of claw 2 of link 5 describes a complex connecting-rod curve q of which a portion is used to insert claw 2 into a perforation of film 3, to advance the film as shown by the arrow and to withdraw claw 2 from the perforation.
$2522$LrG,OC$