Big square baler ???

Can some one inlighten me as to why a big square baler ties a knot at each end of the bale instead of just a single knot like a small baler. Never had anything to do with a big bailer. We use a little one or manly a rounds.
 
With a single knotter the end of the twine is held in the twine disc and has to drag around the bale as it is formed. With a large and dense bale this puts excessive tension on the twine and could make it impossible for the twine disc to hold it tightly enough. The double knotter eliminates this problem since twine can feed into the bale chamber from both top and bottom so the twine is never under high tension as the bale is formed. When the knotter trips the needles bring the bottom twine up and the top and bottom twines are tied together to complete the bale. The twine is cut and immediately the two twines are tied together to start the next bale.
 
The old JD balers in what would be the small square baler were wire tied in models 114W & 116W and built 1946 to 1956 and they did have the knot at each end of the bale.
 
I don't know anything newer than the 116W so would not know. Just saying some small balers were made that way. So it is not only the big squares that were made that way. The 116W was Deeres first atempt at a tying baler.
 

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