SEWING END PROCESSING METHOD FOR OVER-EDGE CHAIN STITCH

摘要

PURPOSE: To make a thread end hardly frayed by catching the sewing end of a texture with a photoelectric tube, and increasing the tension of thread tension units in a sewing machine extending an empty ring not sewn to the texture at the sewing end and cutting the empty ring near the sewing end. ;CONSTITUTION: In an over-edge chain stitch device, multiple sewing threads 3 extracted from a bobbin winder fitted to a spool holder 1 are inserted into a needle 6 and the upper and lower loopers through multiple thread guides 4 and thread tension units 5, and the needle 6 and the loopers are interlockingly moved synchronously with the texture feed action. The sewing thread 3 is continuously entangled in sequence along the end edge of a texture for the over-edge chain stitch, an empty ring is extended and formed at a sewing end, and the empty ring is cut near the sewing end by an automatic thread cutter. A photoelectric tube arranged with a light projector and a light receiver face to face above and below a sewing section is provided, and the sewing end is caught by it. When the sewing end is detected, the tension of the thread tension units 5 is increased to prevent fraying.;COPYRIGHT: (C)1994,JPO&Japio