Sewing data modifying apparatus

摘要

An apparatus for modifying sewing data to control a sewing machine including (a) a stitch-forming device for forming stitches on at least one work sheet, (b) a work-holding device for holding the work sheet, and (c) a displacing device for displacing at least one of the stitch-forming device and the work-holding device, relative to each other, according to the sewing data, the sewing machine having a prescribed coordinate system, the apparatus including a plurality of detectable objects located at a plurality of fixed positions spaced apart from each other on the work-holding device, respectively; a position detector which detects an actual position of each of the detectable objects in the prescribed coordinate system of the sewing machine; and a data modifying device for modifying the sewing data based on a difference of the detected actual position of the each of the detectable objects from a corresponding one of respective reference positions of the detectable objects in the prescribed coordinate system of the sewing machine.