Patent ID: 7811398

Claim:
An inspection method, for inspecting beads provided on a tire building drum in process of production a pneumatic tire, comprising; measuring a displacement amount in a radial direction on each of the beads lying axially on both sides of the Lire building drum with a non-contact distance sensor while rotating the tire building drum; synthesizing displacement amounts so obtained on the heads on both the sides of the drum, calculating a harmonic of the displacement amounts in the radial direction of the beads by performing harmonic analysis cm resultant synthesized displacement amounts, and determining whether or not a magnitude of the harmonic so calculated falls within a predetermined range; the distance sensor being an eddy current sensor, and the displacement amount in the radial direction of a head wire of each of the heads being measured by measuring a distance from the distance sensor to the head wire; measuring a deviation amount of the head wire in an axial direction of the drum using another non-contact distance sensor; and correcting values measured by the eddy current sensor based on the deviation amount measured to obtain the displacement amount in the radial direction of the bead wire.