Patent ID: 7976661

Claim:
A bead member forming method comprising the steps of: providing a plurality of sector segments which are arranged about a main shaft as being spaced from each other in a circumferential direction and having an outer periphery with a first sidewall of a bead member forming groove, and arcuate members supported axially movably on an outer side of the sector segments, respectively, and having an outer periphery with a second sidewall of the bead member forming groove; causing synchronous movement of the sector segments in radial directions using actuator means for causing synchronous movement of the sector segments in radial directions; causing an axial movement of the arcuate members relative to the sector segments by changing means for axially moving the arcuate members relative to the sector segments, to thereby change and determine a width of the bead member forming groove; causing an integral rotation of the main shaft, sector segments and arcuate members while simultaneously supplying a bead element to said bead member forming groove and spirally winding the bead element multiple times to form a bead member; and removing from said bead member forming groove the bead member which has been formed.