Patent attributes
The subject matter of the present invention relates to 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 rearwardly discharged from the back 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. On its way between the precleaning sieve and the lower sieve, the mixture of grain and chaff that has passed through the precleaning sieve be passed via a grating which is permeable to air and disposed separately from the lower sieve, to which grating a current of air can be applied by the fan as well.
