FIG. 1 is a perspective view of a sewing machine; FIG. 2 is a front view thereof; FIG. 3 is a top view thereof; FIG. 4 is a right-side view thereof; FIG. 5 is a left-side view thereof; FIG. 6 is a rear view thereof; FIG. 7 is a bottom view thereof; and, FIG. 8 is another perspective view thereof. The broken lines depict unclaimed subject matter only and form no part of the claimed design.