Transducer machine and spool construction therefor

Claim 1

A RECORD TRANSDUCING MACHINE FOR TRANSDUCING A SIGNAL RECORDED ON A RECORD MEDIUM COMPRISING TAKE-UP SPOOL MEANS ADAPTED TO BE POWER DRIVEN TO WIND A RECORD MEDIUM THEREON, SUPPLY MEANS FOR ROTATABLY SUPPORTING A RECORD MEDIUM THEREON IN A SPIRAL COIL FOR UNWINDING OF THE RECORD MEDIUM FROM THE COIL AS IT IS WOUND ON SAID TAKE-UP SPOOL MEANS AND ADAPTED TO BE POWER DRIVEN FOR WINDING THE RECORD MEDIUM BACK INTO A SPIRAL COIL THEREON AS IT IS UNWOUND FROM SAID TAKE-UP SPOOL MEANS, SAID TAKE-UP SPOOL MEANS HAVING A SLOT EXTENDING INWARDLY FROM THE RADIALLY OUTERMOST MARGIN THEREOF FOR ACCOMMODATING EDGEWISE INSERTION INTO SLOT OF A TAPE-LIKE END PORTION OF THE RECORD MEDIUM WHICH IS INITIALLY WOUND IN A SPIRAL COIL ON SAID SUPPLY MEANS, AND MEANS FOR RETAINING SAID END PORTION IN SAID SLOT, SAID RETAINING MEANS BEING OPERATIVE TO AUTOMATICALLY RELEASE SAID END PORTION OF SAID RECORD MEDIUM AS THE RECORD MEDIU IS WOUND BACK INTO A SPIRAL COIL ON SAID SUPPLY MEANS, SAID SUPPLY COIL OF COMPRISING A CARTRIDGE FOR RECEIVING SAID SPIRAL COIL OF SAID RECORD MEDIUM AND HAVING MEANS FOR HOLDING SAID TAPE-LIKE END PORTION SECURELY THEREWITHH, AND TUCK-IN MEANS OPERATIVELY ASSOCAITED WITH SAID CARTRIDGE AND OPERATIVE FOR PRESSING SAID END PORTION INTO ENGAGEMENT WITH SAID HOLDING MEANS OF SAID CARTRIDGE AS THE END PORTION IS WOUND BACK INTO A SPIRAL COIL ON SIAD CARTRIDGE