248 



AGRICULTURAL ENGINEERING 



other part. This action makes the difficulty hard to locate. 

 It is easy to overcome by simply tightening the chain and by 

 oiling. 



The elevator chain, the long chain which drives the ele- 

 vator rollers, should not be run too tight, as it increases 

 the draft and the wear of the parts. Machines are some- 

 times greatly damaged in a short time by running this chain 

 too tight. 



Adjustment. To make bundles of the proper size, the 

 binder is provided with a clutch which is placed in gear by 

 the trip when sufficient grain has been gathered by the 

 packers to form a bundle. If the spring which holds the 

 clutch pawl, or dog, in place be lost or broken, the clutch will 

 not be positive in its action and will form undersized bundles. 

 If larger or smaller bundles are desired, the bundle-sizer 

 spring should be adjusted, and not the compress spring or 

 the spring connected with the needle shaft. The latter spring- 

 is used to relieve the strain upon the parts, and should not be 

 made too tight. 



Causes of Failure to Tie. The part of the binder which 

 requires the most careful adjustment is the tying mechanism. 

 Mention can only be made here of a few misadjustments and 

 their symptoms. It is 

 customary for those who 

 practice binder experting 

 to examine the band that 

 comes from the machine 

 when the machine fails 

 to tie. Often the ends 

 of the twine, whether 

 frayed or cut off clean, 

 the kinks in the twine, or the knot, if there should be one 

 in one end of the band, will indicate at once the cause of 



Knotter. Stripper 

 Fig. 154. 



\ 



Twine disk 

 The tying mechanism of a 

 modern binder. 



