| 摘要 |
A rotary hook (1) of a lockstitch sewing machine composed of at least one hook body (2) includes a cylindrical cavity (11) and a basket (6, 6b) free to rotate in the cylindrical cavity (11), a bobbin case (8, 8b) housed in the basket (6, 6b) and a bobbin (4, 4b) housed in the bobbin case (8, 8b), elements (30, 40, 50, 60, 61, 70,) suited to create a friction between the bobbin case (8, 8b) and the basket (6, 6b), so as to prevent the bobbin case (8, 8b) to move freely and to vibrate within the plays present between the bobbin case (8, 8b) and the basket (6, 6b) and to consequently reduce the noisiness created during the sewing operation. |
