COMBINE HARVESTER Russian patent published in 2011 - IPC A01D41/00 A01D41/02 A01D41/12 A01F12/18 

FIELD: agriculture.

SUBSTANCE: invention relates to agricultural machine building. A combine harvester comprises a harvester, an inclined chamber, a device for previous threshing of grain, a threshing unit and a screen-air cleaning facility. The pre-threshing device is arranged in the form of two upper and two lower rolls installed in two layers. A screen and an auger for biologically valuable grain discharge are located under the lower rolls. Each roll has a rotation drive and is equipped with threshing-separating elements in the form of hollow sections. Sections are installed in pairs in the diametral plane of the roll by means of double-arm brackets. In both layers upper and lower rolls are kinematically connected by a synchronising gear. In initial position of rolls one of threshing-separating elements of the first pair lower roll approaches the axis of rotation of the upper roll as much as possible. The threshing-separating element of the upper roll of the second pair approaches the axis of rotation of the lower roll as much as possible.

EFFECT: combine provides for production of biologically valuable seed grain with reduction of its damage.

2 cl, 4 dwg