Abstract: An inspection method for inspecting beads provided on a tire building drum in process of production a pneumatic tire includes measuring a displacement amount in a radial direction on each of the beads lying axially on both sides of the drum with a distance sensor such as an eddy current sensor while rotating the drum, synthesizing displacement amounts so obtained on the beads on both the sides, calculating a harmonic of the displacement amounts in the radial direction of the beads by performing harmonic analysis on a resultant synthesized displacement amount, and determining whether the magnitude of the harmonic so calculated falls within a predetermined range.

Abstract: An inspection method for inspecting beads provided on a tire building drum in process of production a pneumatic tire includes measuring a displacement amount in a radial direction on each of the beads lying axially on both sides of the drum with a distance sensor such as an eddy current sensor while rotating the drum, synthesizing displacement amounts so obtained on the beads on both the sides, calculating a harmonic of the displacement amounts in the radial direction of the beads by performing harmonic analysis on a resultant synthesized displacement amount, and determining whether the magnitude of the harmonic so calculated falls within a predetermined range.

Abstract: There is provided an inspection method for inspecting an object built on a tire building drum to make up a pneumatic tire with respect to profile thereof in process of production of the tire includes, in which data with respect to a profile of the object for a single rotation of the tire building drum is acquired by a two-dimension laser sensor having a detection range along a lateral direction of the object while rotating the drum. Then, using the data so acquired, a radial run-out (RRO) in a circumferential direction of the tire is averaged out in a lateral direction of the object for harmonic analysis, and whether or not the magnitude of the harmonic obtained as a result of the analysis falls within a predetermined range is determined.

Abstract: An inspection method for inspecting beads provided on a tire building drum in process of production a pneumatic tire includes measuring a displacement amount in a radial direction on each of the beads lying axially on both sides of the drum with a distance sensor such as an eddy current sensor while rotating the drum, synthesizing displacement amounts so obtained on the beads on both the sides, calculating a harmonic of the displacement amounts in the radial direction of the beads by performing harmonic analysis on a resultant synthesized displacement amount, and determining whether the magnitude of the harmonic so calculated falls within a predetermined range.

Abstract: In order to reduce the second harmonic of tangential force variation (TFV) of tire constituting one of factors of vibration in high speed running of a vehicle, a tire is rotated at a vibration generating speed and phase and amplitude of the second harmonic of TFV are measured and mass members M are provided or eliminated at two locations opposed to each other in the diameter direction on a circumference of the tire such that the measured second harmonic of TFV is canceled by the second harmonic of TFV caused by providing or eliminating the masses.