Bridgestone Corporation

Yoshiki Mizuta

Masahiro Yoshida

Shogo Ueda

Takashi Kinoshita

Yuichi Kimura

Eiji Kudo

Takahiro Yamada

Yukio Sangawa

Kojiro Torisu

Kiyotaka Yoshii

A compact twister and a method for producing a twisted wire that can efficiently produce a short twisted wire that satisfies performance requirements, as well as a ply and a pneumatic tire twisted using the twister or the method for producing a twisted wire, are provided. The twister includes a rotating body for twisting plural filament wires that are fed thereto to form a cord and for applying a feeding force to the cord. The rotating body includes a feeding mechanism within a housing, and the cord is discharged from the rotating body by the feeding mechanism. The twister carries out twisting operation with one of a cord side of a twisting point or a filament wire side of the twisting point being free. Thus, a compact twister, that can form a cord with excellent rotating property and straightness, is accomplished.

Twister, method for producing twisted wire, ply, and pneumatic tire

A hole center detecting apparatus for positioning the hole of a spool and a cord accurately by determining the coordinates of two points of intersection between the inner circumference of the spool hole and a virtual straight line to compute the coordinates of the center of the hole and by moving the cord according to the computed coordinates of the hole center. A straightness measuring apparatus for measuring the curvature of a cord automatically by detecting the coordinates of three longitudinal points of the cord. A measurement apparatus for measuring a residual torsion automatically by measuring the rotation angle of the end portion of the cord before and after clamped, electrically.

Hole center detecting apparatus, straightness measuring apparatus, and residual torsion measuring apparatus

Growing community of inventors

Tochigi-ken, Japan

Yoshiki Mizuta