| CPC A01F 12/448 (2013.01) | 11 Claims |
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1. A sieve for use in an agricultural harvester, the sieve comprising:
a framework including a pair of opposed side members;
a plurality of louvres extending between the pair of opposed side members, the louvres being arranged in a first set of louvres and a second set of louvres, each of the first set of louvres and the second set of louvres including a plurality of adjacent louvres overlapped with each other, the second set of louvres being disposed downstream or upstream from the first set of louvres relative to an air flow direction (Y) through the sieve during operation;
a first adjustment lath and a second adjustment lath arranged longitudinally adjacent to each other, each of the first adjustment lath and the second adjustment lath being movable in fore and aft directions relative to the air flow direction (Y) through the sieve, the first adjustment lath being connected with the first set of louvres such that the first set of louvres is carried on the first adjustment lath and the second adjustment lath being connected with the second set of louvres such that the second set of louvres is carried on the second adjustment lath; and
an adjustment arrangement for adjusting an offset spacing (X) between the first adjustment lath and the second adjustment lath, the adjustment arrangement including a rotatable elongate element with a longitudinally facing stepped shoulder and at least one stop surface, the elongate element being connected with each of the first adjustment lath and the second adjustment lath such that rotation of the elongate element adjusts the offset spacing (X) between the first adjustment lath and the second adjustment lath, the stepped shoulder including a plurality of stepped surfaces which are selectively engageable with the at least one stop surface, the stepped surfaces respectively defining incremental offset spacings (X) between the first adjustment lath and the second adjustment lath.
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