| 摘要 |
PCT No. PCT/GB90/01458 Sec. 371 Date Jun. 26, 1991 Sec. 102(e) Date Jun. 26, 1991 PCT Filed Sep. 21, 1990 PCT Pub. No. WO91/03928 PCT Pub. Date Apr. 4, 1991.An apparatus for harvesting crop parts from a standing crop and leaving stripped stems in the field has a crop stripping rotor under a hood. Grain strikes the underside of the hood, and four or more piezoelectric impact detectors detect the pattern of grain strike density on the hood. Front end grain losses are found, based on the pattern of grain strikes on the underside of the hood. The hood position is adjusted by a ram in response to data measured by the detectors.
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