Non-stain Technology and a Capability for a Wide Range of Sewing Conditions Gives You High Quality. Yamato's Signatured Active Thread Control supports ideal seam over wide range from soft and elastic seams for microfibers to tight seams for outer wears. Yamato "Non-stain" Technology minimizes the risk of oil stain, the most frequent cause of defects. Easy handling and easy maintenance thanks to switchable needle bar stroke, looper thread take-up cam system and foot lifter lever mechanism.