Crank 1 rotates about fixed axis A. Slider 3 moves along fixed guide a. When crank 1 rotates about axis A, slider 3 reciprocates. Link 4 with claws A reciprocates together with slider 3. Link 5, rigidly secured to connecting rod 2, withdraws claws A of link 4 from the perforations of the film, and springs 6 insert the claws into perforations of the film.
$1654$SC,OC$