| 摘要 |
<p>A thread cutting apparatus and method of the double-chain-ring sewing machine, wherein on the movable cutter a blade section and a looper thread catching portion are formed. When the moving knife from the stitch point side from the outer position to the other side by when the external position moving forward drive, the blade cuts a thread part protruded from the back side of the fabric sewn sutures department cut. When the movable knife from the other side by the external position toward the needle drop position by the side of the external position to after driving movement, the looper thread catching portion hooks and captures a looper thread sewing department protruding toward the back side of the fabric. The cut portion of the looper thread and the looper thread fixed cutter after cutting the ends thereof gripping and holding the looper thread holding member movable cutter disposed between: the front end portion of the needle does not enter the vertical reciprocating movement in located within the scope of the path closest to the position of the needle drop position. Without performing tedious manual work, can be sewn on the back side of the fabric at the end of sewing and stitching department looper thread cut into the line Ministry to shorten the length of residual so that the apparatus and the method can improve the appearance of a sewed product.</p> |
