Erasure prevention control for coaxially mounted tape supply and take-up reels

Claim 1

IN A TAPE TRANSPORT HAVING A PAIR OF COAXIALLY MOUNTED REELS, APPARATUS FOR DETECTING THE PRESENCE OF A "WRITE" LOCK-OUT RING INSERTED IN A GROOVE IN A FIRST REEL, THE GROOVE BEING CONCENTRICALLY POSITIONED ON THE FACE OF THE REEL CLOSEST TO THE SECOND REEL, SAID APPARATUS COMPRISING A PLURALITY OF PINS EXTENDING THROUGH HOLES IN THE SECOND REEL DIRECTLY OPPOSITE THE GROOVE IN THE FIRST REEL, MEANS FOR SUPPORTING THE PINS WITH LIMITED MOVEMENT OF THE PINS PARALLEL TO THE AXIS OF ROTATION OF THE REELS, MAGNETIC MEANS FOR NORMALLY HOLDING THE PINS AND SUPPORTING MEANS IN POSITION SUCH THAT THE PINS PROJECT INTO THE GROOVE WHEN THE FIRST REEL IS IN POSITION WITHOUT THE "WRITE" LOCK-OUT RING, MEANS ENGAGING THE PIN SUPPORTING MEANS FOR NORMALLY URGING THE SUPPORTING MEANS TOWARDS THE MAGNETIC MEANS, THE LOCK-OUT RING WHEN IN POSITION CONTACTING THE PINS AND FORCING THE SUPPORTING MEANS AWAY FROM THE MAGNETIC MEANS, A SWITCH, MEANS FOR ACTUATING THE SWITCH WHEN THE SUPPORTING MEANS IS MOVED AWAY FROM THE MAGNETIC MEANS, AND SOLENOID MEANS CONTROLLED BY THE ACTUATING OF THE SWITCH FOR WITHDRAWING CONTACT OF SAID URGING MEANS WITH THE PIN SUPPORTING MEANS.