Patent ID: 6880603
Filing Date: 2005-04-19
Classification: B29D

Abstract:
1. A tire building drum comprising a hollow main shaft, a pair of bead lock sections arranged concentric with the main shaft and respectively for holding a bead core of a tire, and a radially expansible/contractible carcass-supporting body defining an inner shape of a carcass member extending between the bead cores, the tire building drum further comprising: a pair of care bodies concentric with the main shaft, said pair of core bodies constituting the carcass-supporting body and comprising a plurality of expansible/contractible rigid segments circumferentially abutting on and engaging with each other, a pair of sliders, each slider having one core body and one bead lock section mounted thereon, said sliders being movable toward and away from each other in the axial direction; slider-moving means for moving these sliders to any required axial position; and segment-expanding/contracting means for expanding/contracting the segments of each core body to any required radial position; wherein said segment-expanding/contracting means comprises segment-expanding/contracting link sections joined to the segments, a segment-driving connector joined to a driving arm axially reciprocated by a servo motor, an axially movable segment-binding section for coupling the segment-expanding/contracting link sections to the segment-driving connector, and a break for breaking the segment-binding section, said segment-binding section being movable in an axially center direction by a distance larger than that of the slider guide section of the slider that is also movable in the axially center direction.