| 摘要 |
An automatic sewing machine capable of executing a stitch back operation forms a nonfraying, aesthetically pleasing stitch in an embroidery pattern when resuming a stitching operation after thread breakage. The machine includes a movable needlebar holding a needle, a movable workpiece holder, storage for stitch data representing stitch positions, a control mechanism for controlling the needlebar and workpiece for executing a sewing operation based on the stitch data, a thread breakage detector, a stopping mechanism for stopping the sewing operation upon detection of thread breakage, a stitch back positioner for setting the stitch back position corresponding to the last complete stitch, a nonfraying stitch forming a positioner for setting the nonfraying stitch position, and a sewing operation resuming mechanism.
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