Sieve for a combine harvester cleaning device

In a sieve (166) for a cleaning device (146) of a combine harvester (100), the sieve (166) including a frame (10) having front and rear ends, as considered in a working position within the harvester (100), and comprising opposite transversely spaced longitudinally extending upright frame members, a plurality of similar plates (12) extending transversely between the upright frame members, the plurality of plates 12 each being inclined upwards and rearwards so that adjacent plates have a rear section of one overlapping a front section of the other, the plates (12) respectively being joined to a plurality of transverse axles (20) mounted for pivotal movement in the frame (10), with the axis (20) being equally spaced longitudinally from each other and each being associated with an adjustment element (14) which is movable back-and-forth in the longitudinal direction to effect swiveling of an associated one of the plates (12), and a longitudinally extending adjustment rod (18) having certain features (16) being operably connected for interacting with each adjustment element (14) and being as stable in its position in the longitudinal direction of the sieve (166), relative to the frame (10), so as to adjust the angles of the plates (12) around their respective axles (20) and thus the intervals of the back ends of adjacent plates (12), by moving the adjusting rod (18) in the longitudinal direction of the sieve (166), the improvement comprising:

• said features (16) being so located on the adjusting rod (18) in such a way that at least one plate (12) has an angle different from another pate (12).