Upper-roll fixed, the two rollers under a fixed turn around the center arc movement take-off and landing, under two separate movements can roll up or down with.

上辊固定，两下辊围绕一固定回转中心做弧线升降运动，两下辊可单独升降或同升同降。

youdao

Upper-roll fixed, the two rollers under a fixed turn around the center arc movement take-off and landing, under two separate movements can roll up or down with.

上辊固定，两下辊围绕一固定回转中心做弧线升降运动，两下辊可单独升降或同升同降。

youdao