Indicator of exposed length of film for a motion picture camera

Claim 1

IN A CAMERA, A FILM SPOOL, A DRIVE MOTOR FOR DRIVING SAID FILM SPOOL, A ROTATABLE CALIBRATED DISK FOR INDICATING FILM FOOTAGE ADVANCED IN A SELECTED DIRECTION FOR EXPOSURE, A FIRST AND A SECOND DRIVING MEANS ALTERNATELY DRIVING SAID CALIBRATED DISK IN THE SAME DIRECTION, SAID FIRST DRIVING MEANS COMPRISING A PAWL DRIVEN IN DEPENDENCE UPON ADVANCEMENT OF THE FILM IN SAID SELECTED DIRECTION, AND A TOOTHED RATCHET WHEEL ENGAGED BY THE PAWL AND COUPLED TO SAID CALIBRATED DISK, SAID RATCHET WHEEL HAVING A FLAT IN PLACE OF AT LEAST ONE TOOTH, MEANS TO ENGAGE SAID PAWL IN SAID FLAT AFTER A PREDETERMINED FOOTAGE OF FILM HAS BEEN ADVANCED IN SAID SELECTED DIRECTION, THE WIDTH OF THE FLAT BEING GREATER THAN ONE FEED STEP OF THE PAWL, MEANS COOPERATIVE WITH THE SECOND DRIVING MEANS TO OPERABLY CONNECT THE SECOND DRIVING MEANS WITH SAID CALIBRATED DISK ONLY WHEN THE PAWL ENGAGES THE FLAT IN PLACE OF AT LEAST ONE TOOTH OF SAID RATCHET WHEEL, MEANS OPERABLE IN PREPARATION FOR LOADING SAID CAMERA TO ACTUATE SAID SECOND DRIVING MEANS IN COOPERATIVE RELATION WITH THE LAST-MENTIONED CONNECTING MEANS TO RESET SAID CALIBRATED DISK TO A START POSITION CORRESPONDING TO A ZERO FOOTAGE POSITION IN WHICH SAID PAWL ENGAGES THE TEETH OF SAID RATCHET WHEEL TO DRIVE SAID CALIBRATED DISK.