THE CLEANING APPARATUS 



ferent grain, adjustable sieves have been constructed in 

 which the size of the openings may be changed to suit the 

 kind of grain or seed. This adjustment may be made while 

 the machine is running. All Case separators are regularly 

 fitted with an adjustable conveyor-sieve, commonly called 

 the "chaffer," adjustable conveyor-extension and adjusta- 

 ble shoe-sieve. The latter should be placed in the shoe 

 with the rear rod in the fourth hole and the front end high 

 enough to leave only an inch between it and the heel board 

 of the shoe. 



The Conveyor-Extension or Chaffer-Extension carries 

 the coarse chaff from the conveyor sieve to the stacker. 

 The conveyor sieve should be so adjusted as to let all the 

 good grain through because that which goes to the exten- 

 sion and drops through it is returned with the tailings to 

 the cylinder. The conveyor-extension should be coarser 

 than the conveyor sieve so as to allow all the unthreshed 

 heads to pass through. If they pass over it they are lost. 

 The present style of adjustable conveyor extension is 

 hinged to the rear of the conveyor sieve and also fastened 

 to the conveyor side-rails. By loosening the bolts which 

 hold it to the side rails this extension may be lifted out of 

 the way to get at shoe sieves. 



Common Sieves is the name given to non-adjustable 

 sieves and includes the lip, the round-hole, the oblong-hole 

 and the woven-wire sieves. 



Fig. 48 shows the nine positions or notches, in which a 



