Device for controlling speed for reeling-off tape in tape recorder apparatuses and the like

Claim 1

DRIVE MEANS FOR THE SPOOL OF A TAPE RECORDER IN WHICH TAPE CAN BE SUDDENLY DRIVE IN OPPOSITE DIRECTIONS UNDER CONSTANT TENSION TOWARDS AND AWAY FROM THE SPOOL TO BE RESPECTIVELY WOUND AND UNWOUND FROM SAID SPOOL, SAID DRIVE MEANS COMPRISING A MOVABLE MEMBER WHICH ENGAGES THE TAPE ADJACENT THE SPOOL TO PROVIDE A SERIES OF LOOPS IN THE TAPE LEADING TO THE SPOOL, SAID MEMBER HAVING A NEUTRAL POSITION IN WHICH THE TAPE IS MAINTAINED AT A TENSION EQUAL TO THE TENSION OF THE DRIVEN TAPE AND BEING MOVABLE IN EITHER DIRECTION FROM SAID NEUTRAL POSITION TO COMPENSATE FOR VARIATION IN TENSION IN SAID TAPE ADJACENT THE SPOOL UPON SUDDEN STARTING AND STOPPING OF THE ADVANCING OF THE TAPE, SAID DRIVE MEANS FURTHER COMPRISING REVERSIBLE POWER MEANS FOR DRIVING SAID SPOOL, MEANS CONNECTING SAID POWER MEANS TO THE SPOOL IN DRIVING RELATION AND SELECTIVELY OPERABLE MECHANICAL BRAKING MEANS CONNECTED BETWEEN THE MOVABLE MEMBER AND THE MEANS CONNECTING THE POWER MEANS TO THE SPOOL FOR RESPECTIVELY APPLYING FORCE TO THE LATTER MEANS FOR SLOWING DOWN THE DRIVE TO SAID SPOOL AND SPEEDING UP THE DRIVE TO SAID SPOOL DEPENDENT UPON THE DIRECTION OF MOVEMENT OF THE MOVABLE MEMBER AND THE DIRECTION OF DRIVE OF THE POWER MEANS.