If the sley provides a means of guiding the weft insertion device through the shed, as in the Sulzer gripper loom and some flexible rapier looms, the sley must dwell in its most backward position during the whole of the time occupied by weft insertion.

• 正如苏尔寿片梭织机和某些挠性剑杆织机那样,如果筘座在梭口中能为载纬器提供一个导路,则当筘座运动到最后方位置并进行引纬的全部时间内,筘座必须处于静止状态。