To carry out an adequate origin positioning, by regulating the fluctuation scope, when an x-axis striking member is moved in the x-axis direction, and a plate member is drawn to striking members side.

An x-axis striking member 33 is provided at one side of a movable table 19, an x-axis striking sensor 37 to detect that the x-axis side end face of a plate member W strikes to the striking surface of the x-axis striking member 33 is provided, y-axis striking members 39L and 39R to which the y-axis end face of the plate member W can be struck are furnished to the work clamps 27 respectively, y-axis striking sensors 41L and 41R to detect that the end face at the y-axis side stroke to the striking surfaces of the y-axis striking members 39L and 39R are provided respectively, plate member drawing devices 43 to draw the plate member W to the striking members 33, 39L, and 39R side are provided, and an x-axis cylinder for striking member to move the x-axis striking member 33 in the x-axis direction is also provided.