Photographic cameras fitted with focal plane shutter

Claim 1

IN A PHOTOGRAPHIC CAMERA HAVING A HOUSING, AN OBJECTIVE LENS IN SAID HOUSING, A FILM SUPPLY SPOOL ON ONE SIDE OF THE OPTICAL AXIS OF SAID OBJECTIVE LENS AND A FILM TAKEUP SPOOL ON THE OTHER SIDE OF SAID OPTICAL AXIS, SAID SPOOLS BEING ADAPTED TO SUPPORT A FILM IN THE PATH OF THE LIGHT PASSING THROUGH SAID OBJECTIVE LENS, A FOCAL-PLANE SHUTTER INCLUDING A PAIR OF CURTAINS MOVABLE ACROSS THE FACE OF SAID FILM, THE FIRST OF SAID CURTAINS BEING AN OPENING CURTAIN AND THE SECOND OF SAID CURTAINS BEING A CLOSING CURTAIN, REFLEX MEANS IN SAID HOUSING MOVABLE INTO AND OUT OF SAID OPTICAL AXIS, THE IMPROVEMENT COMPRISING DRIVE GEAR MEANS POSITIONED ADJACENT ONE OF SAID FILM SPOOLS AND CONNECTED TO SAID SHUTTER, SAID REFLEX MEANS, AND SAID FILM TAKEUP SPOOL FOR OPERATIVELY DRIVING SAID SHUTTER, MOVING SAID REFLEX MEANS AND AND ADVANCING SAID FILM A SETTABLE, SELF-CONTAINED TIMING DEVICE IN SAID HOUSING ADJACENT SAID OTHER FILM SPOOL, AND CONNECTING MEANS EXTENDING BETWEEN AND ENGAGEABLE WITH SAID DRIVE GEAR MEANS AND SAID TIMING DEVICE FOR ENGAGING SAID DRIVE GEAR MEANS IN RESPONSE TO THE SETTING OF SAID TIMING DEVICE AND PREVENTING THE OPERATION OF SAID SECOND CURTAIN AFTER SAID FIRST CURTAIN HAS EXPOSED SAID FILM, AND FOR RELEASING SAID SECOND CURTAIN AFTER A PREDETERMINED TIME IN RESPONSE TO THE ACTION OF SAID TIMING DEVICE SO AS TO COMPLETE THE EXPOSURE OF SAID FILM.