Stone detector for harvesting machines

Details Stone detector for harvesting machines Stone detector for harvesting machines

A - Human Necessities

01

D

130/24, 349/31

A01D 75/00 (2006.01) A01D 75/18 (2006.01) A01F 29/16 (2006.01) G01S 15/00 (2006.01) G01V 1/00 (2006.01)

Patent

CA 1168343

STONE DETECTOR FOR HARVESTING MACHINES ABSTRACT OF THE DISCLOSURE 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.

393731

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