| 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 changes the tracing width set by the tracing width setting device to a new tracing width corresponding to a distance between the needle and the fabric-edge in the lateral direction when the presser bar is in the upper position and the needle is in the needle-down position, based on a signals from the needle position sensor and the presser foot switch.
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