One-thread single willing sewing equipment in over lock sewing machine

摘要

PURPOSE:To prevent a stitch from being missed, to prevent a thread from being twice sewn and to prevent the cut of the thread from being generated by using a lower hook looper for which thread holding mechanisms are formed in the front surface and back surface sides of a tip hook part. CONSTITUTION:A front surface thread holding mechanism 14 is formed in the front surface side of a tip hook part 4' in a lower hook looper 4 and a back surface thread holding mechanism 15 to be continued to this front surface thread holding mechanism 14 is formed in the back surface side. When a needle 1 moved upward from a bottom dead point, the lower hook looper 4 is moved to a maximum stroke end (right-most point) in a direction to be crossed with an upper hook looper 5 while a needle thread 9 is held by the lower hook looper 4. When a needle bar is moved upward from the bottom dead point, the needle thread 9 is still engaged to grooves 14 and 15 of the lower hook looper 4. Then, a back scooping stitch is not missed by the upper hook looper 5 to needle 1. Then, when the needle bar is in the bottom dead point, the needle thread 9 can be prevented from being twice sewn by the lower hook looper 4 to needle 1. Thus, problems such as the cut of the needle thread and the destruction of the needle, etc., are not generated.