| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a plate width measurement method and a plate width measurement device that can accurately measure the plate width of a thin plate over the entire length thereof at a low cost even if the shape of the thin plate is bad.SOLUTION: A plate width measurement device 1 detects the positions of both ends in the width direction of a plate material 2 conveyed in a state in which the plate material 2 is wound and hung on a conveyance roll 3, and measures the plate width of the plate material 2 on the basis of the detected positions of both ends. The plate width measurement device 1 includes luminaires 4a and 4b for producing shadows of both ends of the plate material 2 wound and hung on the conveyance roll 3 with a predetermined tensile force; cameras 5a and 5b for picking up an image including the shadows of both ends of the plate material 2 that are produced by the luminaires 4a and 4b; and an end position detection section for detecting the positions of both ends of the plate material 2 on the basis of the positions of the shadows of both ends of the plate material 2 in the image picked up by the cameras 5a and 5b.</p> |
