Acoustic detector with start-up control

Details Acoustic detector with start-up control Acoustic detector with start-up control

1990-10-26

1991-12-10

Melius, Terry L.

Harvesters

Motorized harvester

With condition-responsive operation

56 108, 56DIG2, 56DIG15, A01D 7518

Patent

active

050706829

ABSTRACT:
In a forage harvester having an acoustic detector for sensing air-borne sounds produced by the impact of hard foreign objects on the crop feed mechanism of the harvester, a start-up control is provided for inhibiting the detector output during the intervals when the crop feed mechanism is stopped or being brought up to running speed. In forage harvesters having metal detectors for sensing the presence of metal in the crop material, the electromagnetic sensor in the metal detector inherently produces a noise output signal which is dependent on the speed of the crop feed mechanism, and this signal is used to control the inhibiting of the acoustic detector output.

REFERENCES:
patent: 3889249 (1975-06-01), Bennett, Jr. et al.
patent: 3959953 (1976-06-01), Garrott
patent: 3972156 (1976-08-01), Bennett, Jr. et al.
patent: 4193248 (1980-03-01), Gilleman
patent: 4261161 (1981-04-01), Colgrove et al.
patent: 4275546 (1981-06-01), Bohman et al.
patent: 4290255 (1981-09-01), Martenas
patent: 4353199 (1982-10-01), Chow et al.
patent: 4433528 (1984-02-01), Bohman

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