300 



AGRICULTURAL ENGINEERING 



picker sheller is the one in more general use and is adapted 

 to smaller machines. The shelling mechanism consists of the 

 picker wheels, the bevel runner, and the rag iron mounted on 

 a spring. These three form a triangular open chute through 

 which the ears of corn are fed. The rag iron is adjustable to 

 adapt the machine to large or small ears. On large machines 

 a self-feeder is provided, which arranges the ears endwise 

 and feeds them into the sheller. In shelling large cribs of 

 corn, extension feeders are provided to convey the corn from 

 the crib to the self-feeder. 



Cylinder Shelters. The cylinder sheller consists of a 

 beater wheel within a cylinder made up of parallel steel bars. 



Fig. 190. 



picker-wheel sheller. 



The corn is fed into one end of the cylinder, and, as the ears 

 pass along, the corn is shelled by being crushed against the 

 cylinder by the revolving beater wheel. Cylinder shellers 

 break up the cobs more than picker shellers. 



Separating Device. All power shellers should be pro- 

 vided with a shoe and sieve, and a fan to blow out the chaff 

 and dust. Sometimes a vibrating rack or raddle is substi- 

 tuted for the sieve. After being cleaned, the corn is elevated 



