Patent ID: 8333578
Filing Date: 2012-12-18
Classification: B29C,B29D

Abstract:
1. A center mechanism of a tire vulcanizer, in which a green tire is vulcanized and patterned in such a manner that a bladder is installed in the green tire, and then the green tire is squeezed between a lower mold provided on a base frame and a upper mold, which is positioned above the lower mold and openable and closable relative to the lower mold, the center mechanism comprising: an upper clamp for holding an upper end portion of the bladder; a lower clamp positioned under said upper clamp, said lower clamp for holding a lower end portion of the bladder; a lower bead ring supporting a lower bead of the green tire from below; an upper clamp lifting/lowering mechanism for upwardly and downwardly moving said upper clamp; a lower clamp lifting/lowering mechanism for upwardly and downwardly moving said lower clamp; a bladder well with an upper end thereof being connected to said lower bead ring, said bladder well being capable of placing said upper clamp, said lower clamp, and the bladder inside thereof; and a bladder well lifting/lowering mechanism for upwardly and downwardly moving said bladder well within a range between a bottom position where said lower bead ring is positioned on the lower mold and the bladder is installed in the green tire and a top position where said lower bead ring is positioned above the lower mold and said upper clamp, and said upper clamp, said lower clamp, and the bladder are placed in said bladder well, wherein after the green tire is vulcanized and patterned, said bladder well lifting/lowering mechanism lifts said bladder well from the bottom position to the top position while heights of said upper clamp and said lower clamp are fixed, wherein said lower clamp lifting/lowering mechanism has a cylinder member including a male screw on an outer circumference thereof, and supporting said lower clamp from below, an adjustment nut to be screwed onto said male screw of said cylinder member, and a motor fixed to the base frame, said motor for rotating said adjustment nut.