To continuously correct and measure the peripheral length of a metallic belt, to facilitate the control, and to improve the production efficiency.
The loads of weights 70a, 70b are applied to a metallic belt 100, and the displacement of a driven roller 48 is measured by a first displacement sensor 56 to obtain the peripheral length of the metallic belt 100. Then, a correction roller 84 is displaced in the direction of an arrow D to correct the peripheral length of the metallic belt 100. The displacement of the correction roller 84 is measured by a second displacement sensor 88 to measure the peripheral length of the metallic belt 100 in this condition. The correction roller 84 is displaced in the direction of an arrow C, the loads of the weights 70a, 70b are applied again to the metallic belt 100, and the displacement of the driven roller 48 is measured by the first displacement sensor 56 to obtain the peripheral length of the metallic belt 100.
YAMAUCHI MASAHIKO
KONNO YUICHI
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