Differential capstan assembly

Claim 1

IN A TAPE TRANSPORT SYSTEM FOR REVERSIBLY DRIVING A TAPE UNDR TENSION PAST A TRANSDUCER STATION, THE COMBINATION OF: A FIRST CAPSTAN FOR PERIPHERAL ENGAGEMENT WITH THE TAPE ON ONE SIDE OF THE TRANSDUCER STATION; A FIRST SMALL DIAMETER CIRCUMFERENTIAL DRIVE SURFACE AND A FIRST LARGE DIAMETER CIRCUMFERENTIAL DRIVE SURFACE OPERATIVELY CONNECTED TO SAID FIRST CAPSTAN; A SECOND CAPSTAN FOR PERIPHERAL ENGAGEMENT WITH THE TAPE ON THE OTHER SIDE OF THE TRANSDUCR STATION; A SECOND SMALL DIAMETER CIRCUMFERENTIAL DRIVE SURFACE AND A SECOND LARGE DIAMETER CIRCUMFERENTIAL DRIVE SURFACE OPERATIVELY CONNECTED TO SAID SECOND CAPSTAN; A REVERSIBLE DRIVE MEMBER; A FIRST FRICTIONAL TRANSMISSION MEANS OPERATIVE FOR FRICTIONALLY CONNECTING THE PERIPHERY OF THE DRIVE MEMBER WITH THE FIRST SMALL DIAMETER CIRCUMFERENTIAL SURFACE AND THE SECOND LARGE DIAMETER CIRCUMFERENTIAL SURFACE TO DRIVE THE FIRST CAPSTAN AND THE SECOND CAPSTAN WITH THE FIRST CAPSTAN OPERATING AT A HIGHER PERIPHERAL SPEED THAN THE SECOND CAPSTAN; AND A SECOND ALTERNATE FRICTIONAL TRANSMISSION MEANS OPERATIVE FOR FRICTIONALLY CONNECTING THE PERIPHERY OF THE DRIVE MEMBER WITH THE FIRST LARGE DIAMETER CIRCUMFERENTIAL SURFACE TO DRIVE TH TWO CAPSTANS WITH THE SECOND CAPSTAN OPERATING AT A HIGHER PERIPHERAL SPEED THAN THE FIRST CAPSTAN.