Tire contour measurement data correction method and tire visual inspection device

摘要

In order to conduct a visual inspection correctly for a tire having deflection, contour deformation caused by the deflection of the tire is corrected with respect to tire contour measurement data. A tire contour measurement data correction method includes a step of obtaining a sidewall image in a tire radial direction at each certain rotation angle by a sensor portion while rotating a tire T to be inspected by a tire rotation portion, a step of dividing the sidewall image by a predetermined ratio by an image processing portion and approximating the sidewall image of each divided section by a straight line, a step of calculating an inclination angle in a horizontal direction of the approximate straight line, and a step of rotating the sidewall image of each divided section so that the inclination angle of the approximate straight line agrees with a predetermined angle determined for each divided section.

主权项

1. A tire contour measurement data correction method in a tire visual inspection device, the method comprising the steps of:
measuring surface shapes of a sidewall along a radial direction of a tire at every predetermined rotation angle around a rotation center of the tire; approximating each of the surface shapes measured in the measuring step by a straight line for each section obtained by dividing a distance between an end portion on the shoulder side and an end portion on the rim side of each of the surface shapes by a predetermined ratio and calculating an approximate straight line; and rotating data of the surface shape of the each section measured in the measuring step so that an inclination angle in the horizontal direction of the approximate straight line calculated in the step of calculating the approximate straight line agrees with a predetermined angle determined for the each section.