Harvesters – Motorized harvester – With condition-responsive operation
Patent
1981-04-15
1982-10-12
Hirsch, Paul J.
Harvesters
Motorized harvester
With condition-responsive operation
130 27JT, A01F 1216
Patent
active
043531997
ABSTRACT:
The unpredictability of the actual characteristics of spurious sounds has resulted in the use of electronic filtering or comparator circuits being less than satisfactory in certain cases, such as for distinguishing between machinery sounds and foreign objects in the machinery. An acoustically based stone detector is provided for use on a field harvesting machine. A piezoelectric acoustic detector is attached to the central support web of a feed roll within the frame of the harvester, and a rotating transformer is used to transmit the signal from the feed roll to the frame. The air core rotating transformer is built with one coil rotating with the feed roll and the other coil stationary on the frame. Electronic circuitry is used to process the signal and control the harvester action to protect the cutter blades from damage by detected stones, either by stopping the machine or mechanically ejecting the stones.
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Bryant Cal L.
Chow Mark K.
Seymour Shaun A.
Hirsch Paul J.
Marquette Darrell F.
Miller Larry W.
Seemar Frank A.
Sperry Corporation
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