To obtain a manufacturing process of a bead which can prevent the bead from being scrapped by suppressing the collapsing of the cross sectional shape of the bead.
The pitch sending distance of the bead wire 12 from the first row to the second row is reduced as compared with the diameter D of the bead wire 12. Further, the pitch sending distance of the bead wire 12 after the second row and onwards is made at the same distance as the diameter D of the bead wire. Thereby, as shown from the dotted line to a solid line of Fig.1(A), the bead wire 12 falls in the bottom surface 36A while the bead wire 12 is touching to the bead wire 12 already wound around the bead wire 12. Thereby, the bead wire 12 can be wound in a spiral shape by no opening. The winding position of the bead wire 12 of the first step (the step of the innermost radial direction inside) can be stabilized. Thereby, the bead wire 12 can be spirally wound by no gap. The winding position of the bead wire 12 of the first step (the step of the innermost radial direction inside can be stabilized. Thereby, the bead wire 12 can be spirally wound by no gap. The winding position of the bead wire 12 of the first step (the step of the innermost radial direction inside) can be stabilized. The bead wire 12 can be spirally wound by no gap. The winding position of the bead wire 12 of the first step (the step of the innermost radial direction inside can be stabilized. Thereby, the winding position of the bead wire 12 wound on the outside in the radial direction is stabilized, the collapse of the sectional shape of the bead 40 can be suppressed, and the bead 40 can be prevented from becoming a scrap.
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda