Bridgestone Corporation

Kabushiki Kaisha Bridgestone

Norimichi Uchida

Takao Kokubu

Tomoyuki Kaneko

Yoshiaki Hirata

Takahiro Goto

Kosei Murakami

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

An X-ray tire inspection apparatus comprising X-ray tubesandfor applying an X-ray to a tire, installed right above the opposite ends of the tireconveyed by a roll conveyor, and X-ray line sensorsandarranged in the space between adjacent rollsR andR below the above roll conveyorat positions corresponding to the above X-ray tubesand, respectively, wherein transmission X-ray images of left half and right half portions of the tireare taken by the X-ray line sensorsandand combined by tire internal image inspection meansto obtain a transmission X-ray composite image of the whole tire. Therefore, even a tire having a low aspect ratio can be internally inspected accurately and efficiently.

Method and device for X-ray inspection of tire

A measurement value output device including measuring unit such as current measuring unit () for metering an AC current running through the power line () of a motor (), a detection circuit () for detecting the above measurement value by amplifying the above measured current value, a signal converting unit () for converting the detected measurement value into a time interval (duration) and an ON/OFF signal output unit () for outputting an ON/OFF signal which is kept ON or OFF for the above time interval at predetermined time intervals and outputs the measurement value such as the motor current of a production line used to monitor a measurement value at predetermined time intervals as a pulse signal (digital signal) having a pulse width corresponding to the above measurement value at predetermined time intervals.

Measurement value output device, measurement value monitoring device, current value output device and current monitoring device

The present invention discloses a tire chuck apparatus for holding a tire having a tire bead. The apparatus comprises: a gripping mechanism with at least two gripping members movable in tire radial direction from a retracted position to an extended position for pressing against the inner side of the bead portion of the tire, thereby holding the tire; gripping rollers as the gripping members adapted to be rotatable around an axis substantially parallel to a central axis of the tire; and a rotation drive mechanism for rotating the tire around the central axis of the tire. According to this apparatus, even if the center of the tire and the center of the chuck are out of alignment with each other, by rotating the gripping rollers so as to rotate the tire, the tire is shifted so that the center thereof is aligned with the center of the chuck apparatus, thus reducing mispositioning.

Tire chuck apparatus and method

A tire interior inspecting method irradiates a tire being continuously conveyed by a conveyor with x-rays emitted from a predetermined position, receives the x-rays penetrated through the tire by a high resolution linear x-ray sensor to obtain x-ray information about the tire, compares the x-ray information with normal tire image information about the metallic components of a normal tire, removes parts of the x-ray image information coinciding with the normal tire image information, and decides the quality of interior of the tire on the basis of image information obtained by removing parts of the x-ray image information coinciding with the normal timer image information.

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Kodaira, Japan

Norimichi Uchida