Patent ID: 8635964

Claim:
An automated skip checker device for a sewing machine which has a sewing needle provided to form stitches on a cloth material, an engagement device provided to give tension to an upper thread passing through a needle hole of said sewing needle as a sewing thread, and a thread take-up lever brought into engagement with said upper thread to reciprocally move in association with said sewing needle, said automated skip checker device comprising; a tension provider which transfers a certain amount of tension to said sewing thread in operation, so as to laterally curve said upper thread when a slacked portion appears on said upper thread, and a detector device having a detection member provided to detect a position in which said slacked portion appears, said detector device locating said detection member within a thread route from said engagement device to a tip of said sewing needle, wherein said tension provider being a suction air provider which continuously transfers a vacuum pressure to said sewing thread.