| 摘要 |
<p>PURPOSE:To prevent an arrangement from being disordered when processed vulcanization and facilitate a work of forming, by constructing a metallic belt-shape unit in the layer of center portion in its thickness to minimum and its width to maximum, and a metallic belt-shape unit in the side of inside diameter in its thickness gradually increased and its width gradually decreased. CONSTITUTION:A plain sheet base material of steel plate with a required width W is formed into almost hexagonal cross sectional, for instance, three pieces of steel wire materials W1-W3 by using a cutting roll 6 having a triangular shape cutting edge 6a.... Subsequently, a belt-shape unit 11, in which said steel wire materials W1-W3 are arranged in parallel, is four-layer built and wound successively on the peripheral surface of winding former, and constructed into a bead wire 1 of almost octagonal cross section. At this time, the first and fourth layers T1, T4 is formed in a parallel arrangement of the steel wire materials W1-W3 of almost regular hexagonal cross section, and the second and third layers T2, T3 are formed in a parallel arrangement of the steel wire materials W1-W3 of flat hexagonal cross section with its thickness-way dimension smaller and its breadthwise dimension wider than the layer T1.</p> |
