Combine Harvesters

As the name implies, a combine harvester-thresher performs the multiple operations of harvesting and threshing a crop in a single pass over the field, the sequence of operations being cutting, conveying to the threshing mechanism, threshing, winnowing, cleaning, and finally, eith^ kannin/r «p iln 1!^,¿^irtT «UA — —rr" V- ^

a bin, and from there to a trailer or truck alongside the machine. Because each of these separate operations are performed at the same time in a combine harvester, the resulting machine is necessarily complicated and expensive.

A combine can also be used cither to pick up and thresh crops which have been previously cut and left in the swath, or as a stationary thresher for handling crops which have been cut and stacked. Separate headers, front end reaping mechanisms, are required for harvesting cereal and maize crops. Special attachments allow some combines to windrow or chop and scatter straw as well. Earlier models of combines were pulled by a tractor; the cutting and threshing mechanism was driven either by an auxiliary engine mounted on the combine or by the tractor engine through its power take-off shaft. Modern combines are self-propelled.

The losses from combine harvesting may be ;crious unless a constant watch is kept for signs of unsatisfactory threshing. Conditions may change from one hour to the next, and it may be necessary to vary the adjustments several times during a day for best results.

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