| 摘要 |
An edge tracing sewing machine includes a reciprocable needle bar having a needle at a lower end, a needle position sensor for detecting needle-down position, a presser bar having a presser foot at a lower end, a presser foot switch for detecting an upper position of the presser foot, a vertical feed driving device, a forward feed driving device for feeding a work fabric in a sewing direction, a lateral feed driving device for feeding the work fabric in a lateral direction perpendicular to the sewing direction, a fabric-edge position detector, a tracing width setting device, and a control device. The control device controls the lateral feed driving device based on signals from the fabric-edge position detector and the tracing width setting device, so as to carry out a tracing sewing with the tracing width set by the tracing width setting device. The control device nullifies the forward feed driving device and controls the lateral feed device based on signals from the needle position sensor and the presser foot switch. Accordingly, the difference between a distance from an edge of a work fabric to the needle and the tracing width set by the tracing width setting device is reduced after the work fabric is rotated in a vicinity of a corner of the work fabric to change the sewing direction.
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