Connecting rod 2 has slot b-b sliding along fixed pin C. Link 3 is connected by turning pair B to connecting rod 2 and by turning pair D to link 4 which turns about fixed axis E. When crank 1 rotates about fixed axis A, the tips of claws a of link 3 describe complex connecting-rod curves. At one of the portions of these curves, the claws are inserted into perforations of the film which they advance. At another portion of the curves, claws a are withdrawn from the perforations.
$1383$LG,OC$