LOADING DEVICE FOR SUPPLYING MOUNTED RECTANGULAR WORKPIECE TO FOLDING PROCESSOR

PROBLEM TO BE SOLVED: To provide a method for surely supplying a workpiece to a folding processor without arranging the workpiece.SOLUTION: The folding processing system which comprises a loading device 5 including a robot 7, posture measuring means 36, and plate thickness measuring means, and a catch device 29 includes steps of 1 to 6, in which: 1. determining a linear expression presenting a Y-axis reference side and a linear expression presenting an X-axis reference side of a workpiece on the uppermost part on the loading device by mount posture measuring means, and determining an inclination α of the Y-axis reference side to the X-axis and a new origin O'; 2. correcting a gripping posture of a robot hand based on the inclination α and the origin O' and moving sorption means of the robot hand in a vertical direction to drop the second and following workpieces; 3. measuring the plate thickness by the plate thickness measuring means; 4. holding the plural workpieces temporarily by the catch device when the plural workpieces are held, and returning and mounting the workpieces to the loading device one by one from the uppermost layer; 5. performing the steps 1 to 3 to the returned workpiece; and 6. supplying the workpiece to the folding processor when the plural workpieces are not held in the step 3.