When the back roller does not rotate, the tension in the horizontal part of the warp sheet will increase as the angle of the warp sheet round the back roller increases as the warp weaves down.

• 如果后梁不转动,随着织造的进行(织轴逐渐变小),经纱对后梁的包围角会增大,处于水平位置的经纱片的张力会增加。