Eccentrics 2 and 3 are keyed on shaft 1 rotating about fixed axis A. Eccentric 2 slides in guides a-a of link 4; eccentric 3 slides in guides b-b of link 5 which turns about fixed axis D. Links 4 and 5 are connected together by flat springs 6 and 7. Claw c is attached to link 4. When shaft 1 rotates, claw c describes a complex curve in which the claw is inserted into a perforation of the film, advances the film and is withdrawn from the perforation.
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