| 摘要 |
<p>A single stage molding machine (1) for radial tires which comprises a main molding drum (2) for winding of a radial carcass ply member, locking means for fixedly engaging bead reinforcement members in predetermined surface positions on both sides of the carcass ply member, folding means for folding predetermined portion of the carcass ply member, respectively, around the bead reinforcement members, and a sub-molding drum (6) disposed on a side of the main molding drum (2) away from a drive device (3) and for winding of at least one of a belt member and a tread rubber member. The folding means comprises side bladders disposed on both sides of the main molding drum (2) to have inner and outer overlapping layers and capable of expanding upon injection of a pressurized fluid, and biasing can devices (20, 30) detachably disposed on both sides of the main molding drum (2). The respective biasing can devices (20, 30) comprise an actuator (21, 31), and a hard cylindrical portion (22, 33) mounted to one end of the actuator and having a smaller diameter than a maximum expansion diameter of the outer side bladder. When the actuators (21, 31) are actuated to displace the cylindrical portions (22, 33), the outer side bladder in expansion state is received in the cylindrical portions. According to the invention, it is possible to select for actuation between folding of the carcass ply member due to expansion of the inner and outer side bladders and folding of the carcass ply member due to a combination of expansion of the outer side bladder and movements of the cylindrical portions in the biasing can devices.</p> |
