Abstract: Cereal grain thresher comprising: a feeder, a thresher and counter-thresher unit, a recovery chamber for threshed grains, a rotary air lock mounted in said chamber, a straw-remover disposed beyond said rotary air lock controlled from a fan distributing a current of pulsed air in the opposite direction to the grain flow, and an elevator. In one embodiment the straw remover is formed by a rotary drum carried on a fixed shaft and whose surface is provided with perforations. The shaft supports a trough having mounted at the base thereof an endless screw parallel to the shaft. Between the rotary air lock and the straw-remover is disposed a vertically reciprocated shaker comb having teeth to cause the threshed ears to jump and thus to facilitate the flow of the grains.