To do such warp angle adjusting all rolls are supplied with bow angle adjusting worm-worm wheel gearbox with hand wheel and counter pedestal bearing block. By use of this it is possible to adjust the bow angle at 360 degree warp angle. When the Roll get maximum wrinkle removing, stop the bow angle adjusting and put the roll on bow locked position. Do not do any change in the bow setting bow warp angle with web materials is set. On shaft bow position indicated an arrow showing the bowed position of the Roll.