Regarding the varieties of the movement caused by the fiber induction force and the controlling force in the draft area,namely the decentralization of the velocity changing point on the fiber end.

• 针对纺纱牵伸区中纤维引导力和控制力波动引起的运动状态的多变即纤维头端变速点分布较分散的特点,提出采取附加控制棒在牵伸后区建立一个新的附加摩擦力界、对后区须条进行合理调控的构想。