Fig. 4. Straw chopper attachment for combine (International Harvester Co.)

V. Cleaning Unit. This unit (Figs. 5 and 6) removes chaff and fine residue from the threshed grain. It cleans by the combined action of sieves and an air blast.

A. GRAIN PAN. The grain pan is located so that all threshed grain may fall onto it – both that which passes through the concaves and that which sifts through the straw rack. The grain pan extends from beneath the cylinder to a point well back toward the rear.

The motion of the grain pan moves the grain toward the rear.

Grain pan

Grain pan fingers

Chaffer Chaffer

Extension