Developing device

Claim 1

IN AN APPARATUS FOR CONTACTING AN EXPOSED EMULSION SUPPORTED AND A RECEIVING SUPPORT IN A DIFFUSION TRANSFER OPERATION AND INCLUDING MEANS DEFINING A DEVELOPING ZONE, A PLURALITY OF GUIDE PLATES DEFINING AT LEAST ONE PASSAGEWAY FOR GUIDING SAID SUPPORTS IN GENERALLY SUPERPOSED RELATIONSHIP AT LEAST INTO SAID ZONE, AND A PAIR OF FEED ROLLERS FOR SAID SUPPORTS DISPOSED ADJACENT THE INGRESS END OF SUCH PASSAGEWAY, AT LEAST ONE OF SAID ROLLERS BEING MOUNTED FOR BODILY MOVEMENT TO AND FROM AN OPERATIVE POSITION COOPERATING WITH SAID OTHER ROLLER TO CONTACT SAID SUPPORTS AND A DISPLACED POSITION FOR INTRODUCTION OF SAID SUPPORTS, AND MEANS FOR POSITIVELY ROTATING AT LEAST ONE SUCH ROLLER TO ADVANCE SAID SUPPORTS WHEN SAID MOVABLE ROLLER IS IN SAID COOPERATING POSITION, IN COMBINATION, THE IMPROVEMENT COMPRISING A SET OF STOP FINGERS MOUNTED ON AN AXIS DISPOSED ADJACENT SAID PLATES DOWNSTREAM OF SAID FEED ROLLERS FOR PIVOTAL MOVEMENT BETWEEN A CLOSED POSITION AT WHICH SAID FINGERS PROJECT INTO SAID PASSAGEWAY TO ARREST TRAVEL OF SAID SUPPORTS THERETHROUGH AND AN OPEN POSITION AT WHICH SAID FINGERS ARE RETRACTED FROM SAID PASSAGEWAY TO PERMIT FREE TRAVEL OF SAID SUPPORTS, AND BISTABLE BIASING MEANS CONNECTED TO SAID SET OF FINGERS URGING THE SAME INTO EITHER OF SAID TWO POSITIONS AFTER POSITIVE MOVEMENT OF SAID FINGERS AWAY FROM THE OTHER POSITION AND PAST DEAD CENTER, WHEREBY SAID BIASING MEANS MAINTAINS SAID SET OF FINGERS IN CLOSED POSITION TO LIMIT THE EXTENT OF INTRODUCTION OF SAID SUPPORTS INTO SAID CHANNEL, THEN YIELDS UPON POSITIVE ADVANCE OF SAID SUPPORTS BY SAID DRIVE ROLLERS AND UPON MOVEMENT PAST DEAD CENTER TRANSFERS SAID SET TO OPEN POSITION CLEAR OF SAID SUPPORTS.