Device for stopping or fixing moving or mobile components

In an intermittent drive apparatus for use in a cinematographic apparatus of the type for use with perforated film, said intermittent drive apparatus comprising:

• cam means for controlling transport of said film;
• claw means being controlled by said cam means and being adapted to transport said film, said claw means further being displaceable perpendicularly to the plane of said film to engage and disengage the perforation holes of said film in synchronism with the film-transport movement;
• biasing means urging said claw means in a direction for perforation engagement;
• electromagnetic means having an energized and a deenergized condition, wherein in said energized condition said electromagnetic means holds said claw means in a perforation disengaged position against the force of said biasing means;
• the improvement wherein said intermittent drive apparatus further comprises movable element means for moving in an axial direction so as to follow the engaging and disengaging displacement of said claw means, said electromagnetic means comprising a core and a clamping member between which said movable element means is sandwiched, first additional biasing means for holding said movable element means at all times in contact with said core and said clamping member of said electromagnetic means, and second additional biasing means for holding said movable element means at all times in contact with said claw means.