PURPOSE: To increase the forcing efficiency of the bead part of green tire into a mold bead part as well as to simplify the structure of a tire vulcanizing machine, by introduce a gas into a bladder to expand this bladder, the rising of the upper fixing ring of a bladder holder being controlled, and forcing the lower bead part of raw tire into the bead part of a lower mold, taking advantage of the expanding force of said bladder.
CONSTITUTION: Whole upper mold 1, 3, 5 moves downward by the action of a cylinder or a ball screw, until a green tire 9 contacts a lower bead link 2a. While the lower bead part 9b of the raw tire is in contact with the bead of a lower mold 2, a gas is introduced into a bladder to expand this bladder, wherein the rising the rising of the upper fixing ring 6a of a bladder holder 6 is controlled, and the lower bead part 9b of the raw tire is forced into the bead part of the lower mold 2. In such a way, without introducing any gas into the raw tire, the lower bead part of the raw tire can be precisely set in the mold, by forcing the lower bead part of green tire into the bead part of a lower tire mold, wherein the rising of the upper fixing ring is controlled.
KATO YOSHINOBU
MURAKAMI TOSHIBUMI
