Abstract: A tensioning system for a cleaning blade for a conveying belt. The tensioning system has a frame, a blade support, and a ratchet system. The blade support is movable around a first axis in a first direction to increase cleaning blade pressure and a second direction oppositely to the first direction to decrease cleaning blade pressure. Through the ratchet system, a position of the blade support can be maintained against pivoting in the second direction. The ratchet system has (a) a first ratchet assembly on one of the frame and blade support with at least one ratchet surface facing in a first circumferential direction relative to the first axis and (b) a second ratchet assembly on the other of the frame and blade support and having a first plurality of ratchet surfaces facing in a second circumferential direction oppositely to the first circumferential direction.

Abstract: A conveyor system having a conveying belt trained around a plurality of guide rollers for movement in an endless travel path to convey articles and materials in a travel line. A first roller is mounted in an operative position on a support to bear against the conveying belt. A roller safety support system has a wall assembly that confines downward movement of the first roller in the event that the first roller becomes disengaged from the operative position. The roller safety support system further includes a frame assembly. The wall assembly is mounted to the frame assembly so that an upwardly facing surface on the wall assembly bears supportingly against the first roller in the event that the first roller becomes disengaged from the operative position. The upwardly facing surface bounds a receptacle in which the first roller is confined by the wall assembly in the event that the first roller disengages from the operative position. The receptacle has a variable configuration.