the collar may have a vertical slit extending its full length such slit may be omitted if desired it is useful in facilitating fabrication of the assembly and also for allowing deflected air to escape from the nozzle tube but in a direction other than the direction in which nozzle orifices 62 are facing when the collar is in its lowered position it is also believed apparent from fig5 that the deflected air may escape through the arcuate spaces extending the full length of the collar 39 s inside surface an important aspect of the invention lies in the fact that vortex tube assembly 21 is secured to table top 40 at a point a substantial distance from sewing needle 14 and from the work area surrounding that needle as a result hot air is discharged from the vortex tube at a point remote from the operator noise generated by the vortex tube is also reduced as far as the operator is concerned because of the remote location of the tube no mounting holes are required to be drilled into the casing of the sewing machine nor are any brackets or other attachment means required for securing the vortex tube directly to the machine the remote positioning of the vortex tube leaves the work area clear so that none of the components of the apparatus interfere with advancement of the fabric as it is sewn by the machine the elongated insulated hose not only functions to convey cold air to the nozzle assembly from the remotely located vortex tube but also effectively muffles the sound of air discharged from the cold air outlet of the tube while in the foregoing i have disclosed an embodiment of the invention in considerable detail for purposes of illustration it will be understood by.