| 摘要 |
To effectively restrict occurrence of radially extending grooves in tire sidewall portions, turn-up portions (N) of a tire structure member (K) are turned up around the beads (B) by synchronously moving turn-up arms ( 66 ) axially inward by a moving means ( 75 ), with turn-up rollers ( 70 ) maintained in contact with the turn-up portion (N), and simultaneously, by synchronously swinging the turn-up arms ( 66 ) radially outward by a swinging means ( 76 ). The contact pressure of the turn-up rollers ( 70 ) applied to the turn-up portion (N) can thus be easily adjusted to an optimum value, with the result that impressions (grooves) produced in the outer surface of the turn-up portion (N) (which becomes part of the tire sidewall portion after being turned up) can be kept as shallow as possible.
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