SL752-13/752-13H uper High-speed four-thread overlock sewing machine

Adopting double straight needle,double looper to form 514 stitch,Applicable to
fabric of light and medium material,Controlling needle pole leakage oil which
easy occur when whipstitch gap and sewing in highly speed work.So a
constrainting back oil system was fixed on needle pole which is not only
guarantee enough lubricate but also preventing the leakage oil phenomenon
of needle ploe.