Thresher

The utility model provides a thresher restraines the size that is used for carrying on the inspection hatch of the aperture regulation of sieve. This thresher, screening portion (9) possess from threshed by the portion of threshing (8) by the handled thing in the swing screening portion (91) of separation corn, this swing screening portion (91) possess transfer from thresh the portion (8) leak down by transfer (96) of handled thing, the configuration is in these first sieve (98) of transferring having of a rear side of (96) a plurality of first sieve (251), and second sieve (99) of configuration the having of the rear side of these first sieve (98) a plurality of second sieve (261), a adjustment Assembly (252) that to adjust the aperture of first sieve (98) set up the back tip at first sieve (98), set up the preceding tip at second sieve (99) and will adjust the 2nd adjustment Assembly (262) of the aperture of second sieve (99).