Needle bar adopts full sealed suction oil-return device，special oil seal for the feed bar，prevent oil outside efficiently and ensure the improvement of the product quality.

Compare with other direct-drive overlock machines，shorter 40-50% for comprehensive start and brake response time, obviously increase the efficiency, sewing speed experience is light and fast，increase income efficiently.

Through light，medium，heavy three modes adjustment，can convert from A type-light material，M type-medium material to H type -heavy material freely ; suitable for mesh，knitting，denim，etc different kinds of order demands.

Through light，medium，heavy three modes adjustment，can convert from A type-light material，M type-medium material to H type -heavy material freely ; suitable for mesh，knitting，denim，etc different kinds of order demands.