Improvements in the sieve of rolls, by which the tensioning adjustment system is provided to each of the independent chains (~ 1 ~) and (~ 2 ~) of the sieve, which comprises two sets of rear tyres (1) and (2), one set for each current (and ~ 1 ~). (E ~ 2 ~), each conunto (1) and (2) being formed by two straps (1a) and (2a), respectively.Positioned along one above the other; all the bearings (b) u00a2 (b ~ 1 ~) / (b ~ 2 ~)! To support the axes (a) of the rollers (a) of the sieve consists of lower housing (3) and (4), housing more appropriately interconnected together by screws (5), and which is provided between the internal jacket (6), configured by a tubular cylindrical body (6a).With one of its ends flanged out (6b), jacket (6) which surrounds the axis (a) of each of the rollers (a) of the sieve, and is attached to it by screws (7); around the region median of that shirt (6) are provided for bearings (8) kept in the region through rings elu00e1st ICOS lock (9); also around the jacket (6), is provided for at least a labyrinth ring (10).It has its external surface provided with recesses (10a) and protrusions (10b), coincident with respective recesses provided on the inner side saleiu00eancias and carcasses (3) and (4), creating several contact surfaces.
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