To use a robot even under a condition of high constraint for the robot by absorbing/desorbing the absorbing mechanisms to a moving surface by controlling the pressure of the negative pressure chambers, expanding/contracting the pressure bags, and rotating an operation lever within a movable range for moving the absorbing mechanisms perpendicularly to one another.

The gas in the negative pressure chambers 3, 4 are sucked, and the pressure of the absorbing mechanisms 1, 2 are lowered to closely contact the absorbing mechanisms onto a moving surface. The absorbing mechanism 1 is released from the surface by stopping the gas suction from the negative pressure chamber 3, and sending the gas conversely. An operation lever 7 is rotated clockwise or anticlockwise on a point 9 until it is contacted with the movable control mechanism 13 or 15 by controlling the supply and discharge of the gas by the pipes 25, 27, contracting one of gas bags 21 and 23 and expanding the other one, to move the absorbing mechanism 1 in the paper surface longitudinal direction. The gas of the negative pressure chamber 3 is sucked, the absorbing mechanism 1 is absorbed to a moving surface, and the absorbing mechanism 2 is released from the moving surface by the stop of the gas suction of the negative pressure chamber 4, and the supply of the gas.