| 摘要 |
PROBLEM TO BE SOLVED: To provide an inspection method of a belt structure which, in judging the steel cord arrangement direction of a belt ply in the state of a raw tire, achieves the judgement with a simple method and an inexpensive apparatus, and to provide an apparatus used therefor. SOLUTION: The raw tire 20 in the middle of its formation is arranged on a predetermined axial line L and then an alternating field having a predetermined intensity is generated using an alternating field generating means 2 that is arranged so as to form a magnetic path in the plane where, if an imaginary raw tire corresponding to the specifications of the raw tire of the above state were arranged on the axial line L, one steel cord contained in the belt ply 21A would outreach in the tire width direction region wherein the belt ply 21A, the object of the direction judgement, is positioned at the outermost layer. The alternating flux density of this magnetic path is measured by a magnetic sensor arranged in the above magnetic path, and based on the measured results the arrangement direction of the steel cord of the belt ply, the object of the judgement, is judged. COPYRIGHT: (C)2008,JPO&INPIT
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