| 摘要 |
A peripheral length correction device with a metal ring wrapped around a pair rollers of a rotating driver side and a follower side, wherein, while regulating the separation distance of the pair of rollers and exerting a predetermined tension to the metal ring, corrects the metal ring peripheral length by strengthening the predetermined tension; a peripheral length measurement device which measures the separation distance to provide a measurement value and calculates the metal ring peripheral length from the measurement value; and a surface defect inspection device, wherein, while regulating the separation distance of the pair of rollers and exerting the predetermined tension to the metal ring, inspects for an existing surface defect on the metal ring, which comprise a scraper, wherein each of the pair of rollers has its outer circumferential surface in contact with a blade edge of the scraper.
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