We disclose a roller guard with discharge for friction-driven sweep conveyors. This disclosure limits the introduction of particulate matter into the interface between a driven roller and an inner surface of a continuous conveyor belt. The roller guard assembly is mounted between an upper belt portion and a lower belt portion near the drive roller and has a retaining wall member oriented at an angle that is neither parallel with nor at a right angle to the longitudinal axis of the belt and at such an angle that particulates carried on the inner surface of the lower belt portion are directed toward the discharge aperture in the first sidewall.