Patent ID: 7413507

Claim:
A cleaning device for a combine harvester, with a precleaning sieve, to the upper surface of which a mixture of grain and chaff can be fed during the operation, an upper sieve to which the mixture of grain and chaff discharged from the upper surface of the precleaning sieve can be fed, a lower sieve, to which the mixture of grain and chaff passing through the precleaning sieve can be fed, and with a fan for applying currents of air to the precleaning sieve, the upper sieve and the lower sieve, characterized in that on its way between the precleaning sieve and the lower sieve, the mixture of grain and chaff passing through the precleaning sieve can be moved via a grating which is permeable to air and disposed separately from the lower sieve, to which grating a current of air can also be applied by the fan, wherein the grating is disposed to apply a current of air exiting the grating to a lower surface of the upper sieve.