Device for the twisting and heat setting of threads or yarns of synthetic material, constituted preferably of numerous elementary filaments or fibers

Claim 1

APPARATUS FOR TWISTING A THREAD OF THERMOPLASTIC MATERIAL, COMPRISING A ROTARY UPTWISTER ON WHICH THE THREAD IS HELICALLY WOUND, A ROTARY TAKE-UP SPOOL SPACED FROM SAID UPTWISTER AND ROTATABLE ABOUT AN AXIS INCLINED TO THE AXIS OF SAID UPTWISTER, MEANS FOR ROTATING SAID TAKE-UP SPOOL AND HAVING A SINGLE ORIFICE THERETHROUGH UPTWISTER ONTO SAID TAKE-UP SPOOL WHILE MAINTAINING SLACKBETWEEN SAID UPTWISTER AND SAID TAKE-UP SPOOL, A SINGLE RING-SHAPED DISC DISPOSED BETWEEN SAID UPTWISTER AND SAID TAKE-UP SPOOL AND HAVING A SINGLE ORIFICE THERETHROUGH THROUGH WHICH THE THREAD PASSES AS IT TRAVELS FROM SAID UPTWISTER TO SAID TAKE-UP SPOOL, AND MEANS FOR HEATING SAID DISC THEREBY TO PROVIDE A SHORT, LOCALIZED HEATING ZONE AT SAID ORIFICE OF ONLY A FEW MILLIMETERS IN LENGTH TO HEAT AT ANY ONE TIME ONLY THE SHORT PORTION OF THE LENGTH OF THREAD IN SAID ORIFICE AND TO PROGRESSIVELY HEAT AND TWIST SUCCESSIVE SHORT LENGTHS OF THE THREAD ONLY AS THE THREAD PROGRESSES THROUGH THE HEATING ZONE.