When a loom is set up, the warp is threaded through heedless on two or more shafts.This make it possible to control which warp threads are to be raised or lowered each time the warp is parted .

• 织机装配好之后，经纱要穿在两个或多个织轴的钩针上，这样便可以控制当经纱分开时哪条纬纱上升哪条纬纱向下。