Drive mechanism for microfilm reader-printer

Claim 1

IN A FILM VIEWING AND PRINTING UNIT OF THE TYPE IN WHICH FILM IS ROTATED FROM ONE ROTATING REEL TO ANOTHER PAST A PROJECTOR LENS, A MECHANISM FOR ROTATING SAID REELS, COMPRISING (A) A ROTATABLE DRIVE SHAFT CONNECTED TO ONE OF SAID REELS TO TRANSMIT ITS ROTATION THERETO, (B) A VARIABLE SPEED, REVERSIBLE ELECTRIC MOTOR FOR ROTATING SAID DRIVE SHAFT, (C) MEANS INCLUDING A FIRST CLUTCH OPERABLE TO CONNECT AND DISCONNECT, RESPECTIVELY, SAID DRIVE SHAFT AND SAID MOTOR, (D) A MANUALLY ROTATABLE SHAFT, FOR ROTATING SAID DRIVE SHAFT INDEPENDENTLY OF SAID MOTOR, (E) MEANS INCLUDING A SECOND CLUTCH OPERABLE TO CONNECT AND DISCONNECT, RESPECTIVELY, SAID DRIVE SHAFT AND SAID MANUALLY ROTATABLE SHAFT, (F) A MANUALLY ROTATABLE CONTROL SHAFT RECIPROCABLE MANUALLY IN ITS AXIAL DIRECTION, (G) CLUTCH CONTROL MEANS OPERATIVE UPON THE ROTATION OF SAID CONTROL SHAFT IN ONE DIRECTION TO CAUSE SAID FIRST AND SECOND CLUTCHES, RESPECTIVELY, TO CONNECT SAID DRIVE SHAFT AND SAID MOTOR, AND TO DISCONNECT SAID DRIVE SHAFT AND THE FIRST-NAMED MANUALLY ROTATABLE SHAFT, AND VICE VERSA UPON THE ROTATION OF SAID CONTROL SHAFT IN THE OPPOSITE DIRECTION, (H) MOTOR SPEED CONTROL MEANS CONNECTED TO SAID CONTROL SHAFT TO INCREASE AND DECREASE, RESPECTIVELY, THE SPEED OF SAID MOTOR UPON THE ROTATION OF SAID CONTROL SHAFT IN OPPOSITE DIRECTIONS, RESPECTIVELY, AND (I) MEANS RESPONSIVE TO THE AXIAL MOVEMENT OF SAID CONTROL SHAFT FROM ONE TO THE OTHER OF ITS EXTREME POSITIONS OF RECIPROCATION TO REVERSE THE DIRECTION OF ROTATION OF SAID MOTOR, AND OPERATIVE UPON THE AXIAL MOVEMENT OF SAID CONTROL SHAFT TO A POSITION INTERMEDIATE ITS EXTREME POSITIONS, TO INTERRUPT THE OPERATION OF SAID MOTOR.