RADIAL TIRE BELT FOLDING DRUM

摘要

RADIAL TIRE BELT FOLDING DRUM A segmental drum (10) has spaced-apart inflatable turnup bladders (24) for folding each edge (28) of a belt (30) applied to the drum (10). The pacing of the bladders (24) is adjustable by axial movement in opposite directions of central hub assemblies (42,44) threaded on screws (76). Fine adjustment of the spacing to straighten the fold line (32) of each bladder (24) is provided by axial adjustment of rigid polyurethane bladder support brackets (18) connected to the central hub assemblies (42,44). Radial expansion of the segments (16) is provided by links (84) between each of the segments (16) and spaced drum expanding hub assemblies(86,88) threaded on a drum control screw (96). A molded central filler block (62) of rigid polyurethane is mounted on each segment (16) to fill the space between the bladder support brackets (18). A molded center sleeve (72) of stretchable resilient polyurethane material is positioned over the central filler blocks (62) of the segments (16) and may have a contoured outer surface (74) for shaping the belt (30).