Link 1 of slotted-link mechanism ACB rotates about fixed axis A. Slotted link 2 is connected by turning pair C to link 1 and has slot b which moves along slider 3. Slider 3 turns about fixed axis B. The axis of slot b passes through point C. When crank 1 rotates about axis A, the tips of operating claws a on slotted link 2 describe connecting-rod curves in which claws a are inserted into perforations of the film, advance the film and are withdrawn from the perforations. The paths of the tips of claws a can be changed by adjusting pin B along slot d.
$1392$LG,OC$