Bridgestone Corporation

Takahiro Goto

Shigenobu Saigusa

Takao Kokubu

Masaharu Oku

Norimichi Uchida

Kazuhide Kinoshita

Katsutoshi Nakashima

Kosei Murakami

Yuji Tahara

To provide a resistance measuring device not requiring a long time for the resistance measurement work of a tire and maintaining the accuracy of measurement to assure the electrical conductivity characteristics of the tire and a method thereof. An electrical resistance measuring device for tirescomprises first and second probesfor measuring an electrical resistance value of a tire, wherein the first probesabut on a plurality of portions in an outer peripheral surface of a tread partand the second probeabuts on a periphery of a center part of a tire, and thereby an electrical resistance value between the tread partand the bead partis measured.

Electrical resistance measuring device for tires, and method thereof

The electromagnetic radiation source arranged at the first position apart from the tire irradiates the electromagnetic radiation rays to the first and second points on the tire, respectively, and the first and second coordinates on the camera are acquired, the first and second coordinates corresponding to the first and second points, respectively. The electromagnetic radiation source moved from the first position to the second position along with an axial direction irradiates the electromagnetic radiation rays to the first and second points, respectively, and the third and fourth coordinates on the camera are acquired, the third and fourth coordinates corresponding to the first and second points, respectively. The coordinate of the first point is found by finding the intersection of the straight line connected between the first point and the first coordinate and the straight line connected between the second point and the third coordinate. At the same time, and the coordinate of the second point is found by finding the intersection of a straight line connected between the first position and the second coordinate and the straight line connected between the second position and the fourth coordinate. The real distance between the first point and the second point is calculated based on the coordinates of the first and second points. The length between the first point and the second point on the image is transformed into the real distance between the first point and the second point.

Tire inspection method

A tire uniformity measurement and correction apparatus capable of carrying out measurement and correction of tire uniformity efficiently without causing stagnation of a transfer line due to correction of the tire uniformity is provided. The apparatus comprises right and left transfer conveyors arranged in two parallel files for transferring tires; rim shafts provided at each corresponding middle position of the right and left transfer conveyors for supporting and rotating the tire by upper and lower rims; a rotary drum arranged between the right and left rim shafts capable of moving in a right and left direction to be pressed against the tire supported by one of the rim shafts for detecting load condition while rotating together with the tire; grinder mechanism provided on each of the right and left transfer conveyors at a position opposite to the rotary drum with respect to the transfer conveyor; and control means for controlling uniformity measurement by the rotary drum and uniformity correction by the grinder mechanism so that when the uniformity correction of a tire supported by one of the rim shafts is carried out, the uniformity measurement of another tire supported by another rim shaft is carried out.

Apparatus for measuring and correcting uniformity of tires

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Kodaira, Japan

Takahiro Goto