| 摘要 |
A method and apparatus are disclosed for forming a loop in a seat belt and stitching the looped belt plies together. One sewing machine performs the strength forming stitch pattern such as the butterfly stitch and it is used as a master sewing machine whose sewing time of operation is maximized. During the stitching of butterfly pattern, another seat belt will have been fed into a loop forming means at which a loop is formed and its looped belt plies will have been tacked together by another sewing machine sewing a zigzag stitch. An automatic transfer means transfers looped belts from the first sewing station to the butterfly stitching machine. An automatic bobbin changing apparatus is also provided.
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