Two-part negative holder

Claim 1

A NEGATIVE HOLDER FOR A PROJECTION PRINTER COMPRISING, IN COMBINATION: (A) TWO PAIRS OF WIPERS, (1) THE WIPERS OF ONE PAIR BEING SPACED FROM THE WIPERS OF THE OTHER PAIR IN A PREDETERMNED DIRECTION, (2) THE WIPERS OF EACH PAIR FORMING THEREBETWEEN RESPECTIVE SLOTS EXTENDING TRANSVERSELY OF SAID DIRECTION SUBSTANTIALLY IN A COMMON PLANE, (3) SAID SLOTS BEING ADAPTED SIMULTANEOUSLY TO RECEIVE RESPECTIVE LONGITUDINAL PORTIONS OF A FILM FOR MOVEMENT OF THE FILM UNDER TENSION IN SAID PLANE WHILE SIMULTANEOUSLY FRICTIONALLY ENGAGED BY SAID WIPERS, (B) TWO GATE-FORMING MEMBERS HAVING RESPECTIVE OPPOSITELY DISPOSED CONTACT FACES AND FORMED WITH GATE OPENINGS IN SAID CONTACT FACES, AND (C) ACTUATOR MEANS FOR MOVING ONE OF SAID MEMBERS RELATIVE TO THE OTHER TRANSVERSELY OF SAID PLANE BETWEEN AN INOPERATIVE POSITION AND ON OPERATIVE POSITION, (1) SAID CONTACT FACES IN SAID INOPERATIVE POSITION BEING SPACED FROM SAID PLANE IN OPPOSITE DIRECTIONS TO PERMIT FREE MOVEMENT OF SAID FILM THEREBETWEEN IN SAID PLANE, AND (2) SAID CONTACT FACES IN SAID OPERATIVE POSITION BEING SPACED FROM SAID PLANE IN A COMMON DIRECTION AND CLOSELY ADJACENT EACH OTHER FOR CLAMPINGLY RECEIVING SAID FILM THEREBETWEEN AND SAID GATE OPENINGS BEING ALIGNED IN SAID COMMON DIRECTION.