Film magazine and drive means therefor

Claim 1

IN A MOVING PICTURE CAMERA, A FILM MAGAZINE COMPRISING A CASING, A FILM SUPPLY SPOOL AND A FILM TAKEUP SPOOL IN THE CASING, THE FILM PASSING FROM THE SUPPLY SPOOL PAST AN EXPOSURE POINT AND ONTO THE TAKEUP SPOOL, A SPROCKET ENGAGING THE RUNS OF FILM BETWEEN THE RESPECTIVE SPOOLS AND THE EXPOSURE POINT TO INSURE MOVEMENT OF THE FILM FROM ONE OF THE SPOOLS AND ONTO THE OTHER SPOOL AT THE SAME RATE, A SPRING MOTOR INCLUDING A STORAGE SPOOL FOR THE SPRING, A POWER SPOOL AND A SPRING STRIP NORMALLY BIASED TO COIL ONTO THE STORAGE SPOOL AND CONNECTED TO THE POWER SPOOL TO BE BACK WOUND THEREON, MEANS CONNECTING THE POWER SPOOL DRIVABLY TO THE SPECKET TO DRIVE IT AT A CONSTANT SPEED, AND MEANS FORMING A POSITIVE DRIVING CONNECTION BETWEEN THE SPRING STORAGE SPOOL AND THE FILM TAKEUP SPOOL TO DRIVE THE FILM TAKEUP SPOOL AT VARYING ANGULAR SPEEDS AT THE EFFECTIVE DIAMETERS OF THE SPRING SPOOL AND THE FILM TAKEUP SPOOL CHANGE THEREBY TO WIND THE FILM ONTO THE FILM TAKEUP SPOOL AT A CONSTANT LINEAL RATE.