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.