Low power tape drive mechanism

Claim 1

A MAGNETIC TAPE DRIVE UNIT COMPRISING; A TAPE SUPPLY REEL AND A SPACED TAPE TAKE UP REEL, MAGNETIC TAPE ON THE REELS AND EXTENDING BETWEEN THE REELS, AN ENDLESS LOOP OF NON-RESILIENT FILM INCAPABLE OF SUBSTANTIAL ELASTIC STRETCHING, THE FILM BEING IN FRICTIONAL DRIVING CONTACT WITH AN OUTER LAYER OF TAPE ON BOTH THE SUPPLY AND TAKE UP REELS, SEPARATE MEANS BIASING THE FILM LOOP TO CONTINUALLY HOLD THE FILM LOOP IN SUBSTANTIALLY TAUT CONDITION AND AGAINST THE OUTER LAYER OF TAPE ON BOTH THE SUPPLY AND TAKE UP REELS, MEANS TO DRIVE THE FILM IN A DIRECTION TO CARRY THE TAPE FROM THE SUPPLY REEL TO THE TAKE UP REEL, A MAGNETIC TRANSDUCER IN CONTACT WITH THE TAPE BETWEEN THE SUPPLY REEL AND THE TAKE UP REEL, A TAPE TAKE UP ROLLER IN CONTACT WITH THE TAPE BETWEEN THE SUPPLY AND TAKE UP REELS, RESILIENT MEANS POSITIONED TO BIAS THE TAKE UP ROLLER AND TAPE AWAY FROM THE FILM LOOP WITH SUFFICIENT FORCE TO MAINTAIN A VARIABLE SIZE BRIGHT OF TAPE UNDER SUBSTANTIALLY CONSTANT PRESSURE DURING REELING OR UNREELING TO THEREBY ENABLE THE TAPE TO BE DRAWN ACROSS THE TRANSDUCER UNDER SUBSTANTIALLY CONSTANT TENSION WITHOUT THE INTRODUCTION OF SLIPPAGE BETWEEN THE TAPE AND THE FILM.