| 摘要 |
A workpiece trimming device for sewing machines having a fixed blade mounted in one side of the machine's presser foot and a movable blade operatively associated with the underside of the fixed blade reciprocally driven within a passage formed on the opposite side of the presser foot in alignment with the fixed blade. A first biasing force acting on the presser bar continually urges the presser foot in the direction of the needle plate and a second biasing force acting in the opposite direction of the first maintains contact between the fixed and movable blades. The first and second biasing forces acting in opposite directions provides an improved means for controlling the intended functions of the presser foot and cooperating trimming blades.
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