The JI810/820 adopts double straight needle, jampan-aligning thread, and vertical rotating spindle hook threads to form double-thread lock stitches.

• 820型高头厚料机采用单直机针，滑杆排线，立式旋梭勾线，形成双线锁式线迹，上下轴采用螺旋伞齿轮转动。