280 AGRICULTURAL ENGINEERING 



The Grain Pan or Conveyor. This is a solid removable 

 bottom which extends from the cylinder back to the shoe 

 and catches all of the grain coming from the grate and 

 through the straw rack. 



The Shoe. The shoe is the frame which carries the 

 sieves. In it the grain is separated from the chaff as the 

 grain and chaff pass over the sieves and strike a blast of air 

 from the fan. The sieves and the blast from the fan are sub- 

 ject to adjustment, and upon their skillful manipulation 

 depends largely the efficiency of the machine in cleaning the 

 grain. 



The Self-Feeder and Band Cutter. The self-feeder is an 

 attachment which receives bound bundles and elevates them 

 to the throat of the cylinder, cuts the bands, and uniformly 

 and evenly feeds the grain into the cylinder. 



Straw Stackers. Formerly the straw was taken care of 

 by a carrier, which consisted of a frame over which an end- 

 less web was drawn. Later this type of carrier was made 

 to swing in different directions from the machine. Most 

 machines of the present day are equipped with wind stack- 

 ers, or blowers. These stackers have a fan which receives 

 the straw from the straw rack and blows it to any part of 

 the stack desired, reducing the amount of labor involved. 



The Weigher. The majority of modern machines are 

 equipped with a weigher to measure the grain as it is delivered 

 into the wagon or into bags. If the machine is simply pro- 

 vided with an attachment to elevate the grain into the wagon 

 box, the attachment for so doing is called the grain elevator. 



Size of Threshing Machines. There are usually two 

 dimensions given to a threshing machine, or separator: the 

 first is the length of the cylinder, and the second is the inside 

 width of the machine, where the various separations of grain, 

 straw, and chaff are brought about. The sizes vary from 



