| 摘要 |
A rotary hook (11) and bobbin (12) assembly for a single needle lock-stitch sewing machine (9). he bobbin (11) has no case but has a flat end plate (12b) and a convexly curved end plate (12a).The bobbin older (11) has a post (14) with a means (13) for locking the bobbin (12) and a relatively wide undergroove (16) in its wall for adjusting tension. |
