Detector for a Sewing Machine

FIG. 1 is a front, right-side, bottom perspective view of a detector for a sewing machine showing the new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a rear elevational view thereof; FIG. 4 is a left-side elevational view thereof; FIG. 5 is a right-side elevational view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; and, FIG. 8 is a rear, right-side, bottom perspective view thereof. The broken lines depict parts of the detector for a sewing machine that form no part of the claimed design. The dot-dash chain lines depict boundaries of the claimed subject matter, and thus form no part of the claimed design.