PROBLEM TO BE SOLVED: To improve a material web so as to obtain improved web motion characteristics during revolution of a drum.SOLUTION: A device includes an adjustable drum which inverts a material web. The drum can be adjusted with two degrees of freedom and is connected to two actuators. At least one of the actuator has one side held by a first connection portion and the other side held to revolve by a second connection portion connected to at least one drum. At least one of the actuators is connected to a calculation circuit, which calculates a length L of the actuator according to a numerical expression from a relative vector interval between the first connection portion and second connection portion of a predetermined pivot and a predetermined angle α of revolution of the drum, and substitutes (α=0°) in the vector interval of the second connection portion from the pivot when the drum is not revolved.