Patent ID: 7013691
Filing Date: 2006-03-21
Classification: F16G

Abstract:
1. A peripheral length adjusting apparatus for an endless metallic ring in which an endless metallic ring is wound on plural rollers, and an interval between the plural rollers is enlarged such that the endless metallic ring is stretched while the plural rollers are rotated, whereby the endless metallic ring is plastically deformed and a peripheral length of the endless metallic ring is adjusted to a target peripheral length, comprising: a peripheral length measuring device which measures the peripheral length of the endless metallic ring before the peripheral length is adjusted; an adjusting device which adjusts the peripheral length of the endless metallic ring to the target peripheral length by enlarging the interval between the rollers based on the measured peripheral length such that the peripheral length of the endless metallic ring when the peripheral length is adjusted is longer than the target peripheral length by a contraction amount due to elastic deformation of the endless metallic ring after the peripheral length is adjusted; a volume measuring device which measures a volume of the endless metallic ring before the peripheral length is adjusted; and a changing device which chances the rate of the contraction amount based on the measured volume; wherein the adjusting device adjusts the peripheral length of the endless metallic ring to the target peripheral length by enlarging the interval between the rollers based on a rate of the contraction amount due to elastic deformation of the endless metallic ring after the peripheral length is adjusted with respect to the peripheral length of the endless metallic ring before the peripheral length is adjusted, the rate of the contraction amount having being obtained in advance.