Patent ID: 8061958

Claim:
A method of adjusting the deviations of plate material of a rectangular shape, which method adjusts at one location the deviations of the inclination, positioning, etc., from the desired state of the plate material that is arbitrarily placed in a horizontal position before the plate material is delivered to the forming machine, the method comprising: measuring each of the positions of the first and second points of an arbitrary choice on the edge of one of the long sides of the plate material; adjusting the deviation of the inclination of the plate material by rotating it on the horizontal plane so as to remove the difference in the positions of the plate material in the lateral direction between the first and second points, based on the results of the measurements of the first and second points; measuring the position of a third point of an arbitrary choice on the edge of the second or opposite long side of the plate material for which the deviation of the inclination has been adjusted; calculating the position of the center line extending in the lateral direction of the plate material for which the deviation of the inclination has been adjusted, based on the results of the measurements of the positions of the first, second, and third points; adjusting the deviation of the positions in the lateral direction by moving the plate material in the lateral direction and substantially matching the center line extending in the lateral direction of the plate material with the targeted center line; measuring a fourth point of an arbitrary choice on the edge of the short side of the plate material for which the deviation of the plate material in the lateral direction has been adjusted; calculating the position of the center line of the plate material extending in the longitudinal direction, based on the results of the measurements of the position of the fourth point; and adjusting the deviation in the longitudinal direction of the plate material by moving the plate material in the longitudinal direction and substantially matching the center line extending in the longitudinal direction of the plate material with the targeted center line, based on the results of the calculation of the position of the center line extending in the longitudinal direction.