| 摘要 |
An upper looper driving device of a sewing machine is provided. The device includes an upper looper driving shaft which is rotatable around an axis thereof, an upper looper holder having an upper end portion at which the upper looper is held, an upper looper swinging arm having one end portion supported by the upper looper driving shaft such that a position of the upper looper swinging arm is adjustable along an axial direction of the upper looper driving shaft and the other end portion to which the upper looper holder is rotatably coupled, and an upper looper guide slidably holding the upper looper holder. The upper looper guide is supported by a frame of the sewing machine such that a position of the upper looper guide is adjustable along a direction parallel to the axial direction of the upper looper driving shaft.
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