| 摘要 |
A sewing machine for forming successive stitches along an edge of a workpiece, including an endwise reciprocable sewing needle, a feeding device for feeding the workpiece in a feed direction, in synchronization with reciprocations of the needle, a control motor for changing a relative position between the needle and the workpiece in a lateral direction perpendicular to the feed direction, an edge sensor generating an output signal corresponding to a position relative to the workpiece edge in the lateral direction, and a position control device for receiving the output signal from the sensor in synchronization with the needle reciprocations and applying to the control motor a drive signal to control the relative position between the needle and the workpiece edge. The drive signal is determined based on the output signal of the sensor. A signal delay device is provided to delay the application of the drive signal to the control motor, with respect to the generation of the output signal from the sensor, by a time interval corresponding to a feeding movement of a detected portion of the workpiece to a lowered position of the needle.
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