Method and devices for operating apparatus passed through by record carrying films

Claim 1

IN A PHOTOGRAPHIC APPARATUS, IN COMBINATION, A PAIR OF LOOP-FORMING MEANS EACH HAVING A PAIR OF MEMBERS SPACED FROM EACH OTHER AND DEFINING BETWEEN THEMSELVES A CURVED FILM PATH; MOVING MEANS OPERATIVELY CONNECTED TO SAID PAIR OF LOOP-FORMING MEANS FOR MOVING THE LATTER BETWEEN A THREADING POSITION WHERE SAID MEMBERS OF EACH LOOP-FORMING MEANS ARE RELATIVELY CLOSE TO EACH OTHER AND AN OPERATING POSITION WHERE SAID MEMBERS OF EACH LOOP-FORMING MEANS ARE RELATIVELY DISTANT FROM EACH OTHER; OPERATING MEANS PERMANENTLY TENDING TO MOVE SAID MOVING MEANS AND THEREBY SAID PAIR OF LOOP-FORMING MEANS FROM SAID THREADING INTO SAID OPERATING POSITION THEREOF; SOLENOID MEANS OPERATIVELY CONNECTED TO SAID MOVING MEANS FOR ACTUATING THE LATTER AGAINST THE ACTION OF SAID OPERATING MEANS TO PLACE SAID PAIR OF LOOP-FORMING MEANS IN SAID THREADING POSITION WHEN SAID SOLENOID MEANS IS ENERGIZZED; GUIDE MEANS LOCATED ADJACENT TO ONE OF SAID LOOP-FORMING MEANS FOR RECEIVING A FILM STRIP AFTER IT HAS MOVED THROUGH SAID PAIR OF LOOP-FORMING MEANS AND FOR GUIDING THE FILM STRIP ALONG A GIVEN PATH, SAID GUIDE MEANS INCLUDING A PAIR OF WALL PORTIONS SPACED FROM EACH OTHER AND DEFINING SAID PATH OF AT LEAST ONE OF SAID WALL PORTIONS BEING ELECTRICALLY CONDUCTIVE; A SPRINGY ELECTRICALLY CONDUCTIVE MEMBER CARRIED BY THE OTHER OF SAID WALL PORTIONS AND ENGAGING SAID ONE WALL PORTIONS WHEN THERE IS NO FILM BETWEEN SAID WALL PORTIONS, SAID ONE WALL PORTION AND SAID SPRINGY MEMBER FORMING A SWITHC WHICH IS NORMALLY CLOSED; AND ELECTRICAL CIRCUIT MEANS OPERATIVELY CONNECTED TO SAID SWITCH AND TO SAID SOLENOID MEANS FOR MAINTAINING THE LATTER ENERGIZED UNTIL A FILM STRIP MOVES BETWEEN SAID SPRINGY MEMBER AND SAID ONE WALL PORTION, SAID FILM STRIP BEING MADE OF AN ELECTRICALLY NON-CONDUCTIVE MATERIAL SO THAT UNTIL THE LEADING END OF THE FILM STRIP REACHES SAID SPRINGY MEMBER SAID SOLENOID MEANS IS ENERGIZED TO MAINTAIN SAID PAIR OF LOOP-FORMING MEANS IN SAID THREADING POSITION THEREOF WHILE WHEN THE FILM MOVES BETWEEN SAID SPRINGY MEMBER AND SAID ONE WALL PORTION THE CIRCUIT OF SAID SOLENOID MEANS WILL BE OPENED TO DE-ENERGIZE SAID SOLENOID MEANS AND SAID PAIR OF LOOPFORMING MEANS WILL AUTOMATICALLY BE MOVED INTO AND HELD IN SAID OPERATING POSITION THEROF.