The needle bar is likely to suffer oil leaking easily when the machine works at high speed .therefore,it adopts forced oil-returning device to ensure the sufficient  lubrication of the needle bar and also to effectively prevent the needle bar from suffering oil leaking.Outside-mounted rocker can make the adjustment of the upper looper easy.It makes the oil fully supply the rocker and ensure the sufficient lubrication of the rocker,and prevents oil leaking at the same time.

HR silicon oil device make synthetic fibre thread,which is of weak heat resistance,appicable to high-speed sewing machine,prevents thread breakage and cloth melting at high degree,and make the needle feet steady and beauty.