Film drive mechanism for photographic cameras

Claim 1

A CONTINUOUS FILM DRIVE MECHANISM FOR A PHOTOGRAPHIC CAMERA INCLUDING CONSTANT SPEED DRIVE MEANS, A CARRIER MOUNTED AT THE SUPPLY SIDE OF SAID DRIVE MEANS FOR FORWARD AND REVERSE MOTION IN THE SAME DIRECTION AND IN THE OPPOSITE DIRECTION TO THE FILM, REGISTER MEANS OPERATIVELY ASSOCIATED WITH SAID CARRIER FOR SUPPORTING THE FILM DURING EXPOSURE, A GUIDE ROLLER ON THE CARRIER AND A FIXED GUIDE ROLLER AT THE SUPPLY SIDE OF THE REGISTER MEANS FOR DEFINING A SUPPLY LOOP IN THE FILM, A GUIDE ROLLER ON THE CARRIER AND A FIXED GUIDE ROLLER AT THE TAKE-UP SIDE OF THE REGISTER MEANS FOR DEFINING A TAKE-UP LOOP IN THE FILM, MEANS FOR AUTOMATICALLY AND PRIOR TO EACH EXPOSURE ESTABLISHING DRIVING ENGAGEMENT OF THE FILM WITH THE CARRIER TO MOVE THE LATTER FORWARDLY WITH THE FILM THEREBY SHORTENING AND LENGTHENING THE TAKE-UP AND SUPPLY LOOPS, RESPECTIVELY, AND REDUCING THE SPEED OF THE FILM BETWEEN SAID LOOPS, MEANS FOR AUTOMATICALLY AND SUBSEQUENT TO EACH EXPOSURE REMOVING SAID DRIVING ENGAGEMENT OF THE FILM WITH THE CARRIER AND MOVING THE LATTER REVERSELY THEREBY LENGTHENING AND SHORTENING THE TAKE-UP LOOPS, RESPECTIVELY, AND INCREASING THE SPEED OF THE FILM IN THE INTERVALS BETWEEN SUCCESSIVE EXPOSURES.