Thread-chain cutter for sewing machines

Claim 1

IN COMBINATION WITH A SEWING MACHINE HAVING A STITCHING MEANS FOR STITCHING SUCCESSIVE SPACED SECTIONS OF STITCHED MATERIAL AND FEEDING MEANS FOR CONVEYING THE STITCHED MATERIAL BENEATH AND REARWARDLY FROM THE STITCHING MEANS, A SAID SEWING MACHINE FURTHER HAVING MEANS DEFINING A SUBSTANTIALLY ENCLOSED CHAMBER EXTENDING BENEATH AND REARWARDLY FROM THE STITCHING MEANS, SAID CHAMBER HAVING AN APERTURE DISPOSED REARWARDLY AND IN THE PATH OF THE STITCHED MATERIAL AS IT TRAVELS REARWARDLY FROM THE FEEDING MEANS, SAID APERTURE BEING RELATIVELY LARGE WITH RESPECT TO THE THREAD-CHAIN SO AS TO ALLOW A SUBSTANTIAL VOLUME OF AIR TO FLOW THROUGH THE APERTURE SUCTION MEANS COMMUNICATING WITH SAID CHAMBER FOR DRAWING A SUBSTANTIAL STREAM OF AIR THROUGH SAID APERTURE, A HEATED WIRE MECHANICALLY SUPPORTED BENEATH SAID APERTURE AND INTERPOSED IN THE PATH OF THE AIR-STREAM SO AS TO BE COOLED THEREBY WHEN THE APERTURE IS UNRESTRICTED, MEANS SURROUNDING SAID HEATED WIRE FOR PREVENTING STITCHED MATERIAL FROM BEING SUCKED INTO DIRECT CONTACT WITH THE HEATED WIRE WHILE ALLOWING A THREADCHAIN TO BE DRAWN ACROSS THE HEATED WIRE FOR SEVERANCE