US Patent 7131531 Roller shoes in modular-belt conveyors

Roller return and holddown shoes for a modular-belt conveyor. The shoes have a body that extends in height from a base to a convex outer face. Cavities in the body open onto the base and the outer face. Rollers rotatably received in the cavities have salient portions protruding past the outer face of the shoe to bear in rolling contact against the outer surface of a belt draped over the shoe. Optional edge guides upstanding from the outer face of the shoe may be used to restrain the side edge of a belt supported on the shoe and prevent the belt from wandering laterally.