In case of spike tooth thresher, an aspirator blower sucks out the lighter material from the top sieve and throws it out from blower outlet. The sieves help in further cleaning of the grain by allowing heavier straw to overflow
Ngati ndi spike tooth thresher, chopetera mbewu chimayamwa zosalemera kuchokera pamwamba pa sefa ndipo chimaponyera kunja. Masefa amathandiza kupukuta maso a mbewu polola kuti busa lolemera lisefukire 