Data processing apparatus

Claim 1

APPARATUS FOR GAINING ACCESS BY OPTICAL MEANS TO PREDETERMINED DATA STORED ON A FLIM STRIP THROUGH WHICH LIGHT IS TRANSMITTED, SAID FILM STRIP ALSO INCLUDING COARSE AND FINE POSITION DISTINGUISHING MARKS CORRELATED TO THE LOCATION ON THE DATA STORED ON SAID FILM STRIP, WHICH COMPRISES A GUIDE TRACK FOR SUPPORTING SAID FILM STRIP FOR MOVEMENT LONGITUDINALLY OF ITSELF PAST A FILM GATE, AN APERTURE PLATE LOCATED AT SAID FILM GATE, SAID APERTURE PLATE INCLUDING AN ELONGATED PROJECTION SLIT EXTENDING TRANSVERSE TO THE DIRECTION OF MOVEMENT OF SAID FILM STRIP AND ACROSS WHICH SLIT THE STORED DATA IS PASSED FOR PRINTING, SAID APERTURE PLATE BEING ALSO PROVIDED WITH COARSE AND FINE APERTURES LATERALLY OFFSET FROM SAID PROJECTION SLIT AND ADAPTED TO REGISTER WITH THE COARSE AND FINE POSITION DISTINGUISHING MARKS ON SAID FILM STRIP, THREE SETS OF FRICTION DRIVE MEANS LOCATED IN LONGITUDINALLY SPACED RELATION ALONG SAID GUIDE TRACK FOR TRANSPORTING SAID FILM STRIP PAST SAID FILM GATE, EACH SAID DRIVE MEANS COMPRISING A DRIVE ROLLER LOCATED AT THE OPPOSITE SIDE OF FILM STRIP, A PINCH ROLLER LOCATED AT THE OPPOSITE SIDE OF SAID FILM STRIP AND MEANS FOR SHIFTING SAID PINCH ROLLER FROM A RETRACTED POSITION TO AN ADVANCED POSITION WHEREIN THE FILM STRIP IS PINCHED BETWEEN THE TWO ROLLERS AND THEREBY FRICTIONALLY DRIVEN, A FIRST ONE OF SAID FRICTION DRIVE MEANS BEING OPERATED AT A FAST SPEED AND CONTROLLED BY THE COARSE POSITION DISTINGUISHING MARKS ON SAID FILM STRIP, A SECOND ONE OF SAID FRICTION DRIVE MEANS BEING OPERATED AT A SLOWER SPEED AND BEING CONTROLLED BY THE FINE POSITION DISTINGUISHING MARKS ON SAID FILM STRIP, AND THE THIRD FRICTION DRIVE MEANS BEING THEREAFTER OPERATED AT AN EVEN SLOWER SPEED FOR THE PURPOSE OF SCANNING THE STORED DATA ON SAID FILM STRIP.