| 摘要 |
A sewing machine (10a) comprises a presser foot (12); a drive shaft (20) operably connected to the presser foot (12) which imparts periodic upward movement to the presser foot (12); and a biasing mechanism operably connected to the presser foot (12) which normally biases the presser foot (12) into a downward position, the biasing mechanism comprising a toggle link having a pivot (32), a resilient element (36) operably connected to the toggle link (30) on one side of the pivot (32) and the presser foot (12) operably connected to the toggle link (30) on the other side of the pivot (32). In another embodiment, a sewing machine (10b) comprises a presser foot (12); a drive shaft (20) operably connected to the presser foot (12) which imparts periodic upward movement to the presser foot (12); and a biasing mechanism operably connected to the presser foot (12) which normally biases the presser foot (12) into a downward position, the biasing mechanism having a preload force therein when the presser foot (12) is in a lowermost position; the presser foot (12) being selectively raisable without increasing the preload force of the biasing mechanism.
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