During the threshing process 60 to 80 percent of the grain is now separated from the straw in the threshing cylinder. If the efficiency of separation in the cylinder could be increased, sufficiently, the straw rack of a combine could be eliminated. Research described in this paper was conducted to investigate the efficiency of separation of a new threshing device. A threshing cone with the material moving axially from the small end of the cone to the large end, provides a device for increasing the time that the material is subjected to threshing and separating forces.
Available at: http://works.bepress.com/wesley_buchele/18/