Metal and hard object detectors with shared fixed support inside

Details Metal and hard object detectors with shared fixed support inside Metal and hard object detectors with shared fixed support inside

1990-10-26

1992-03-03

Melius, Terry Lee

Crop threshing or separating

Means responsive to a sensed condition

Foreign material

56 104, 56 108, 56DIG15, 460 3, A01D 7518, A01F 1216

Patent

active

050928180

ABSTRACT:
A forage harvester having a feed mechanism for transporting crop material along a feed path to a rotating cutterhead is provided with a first detector for detecting metal objects in the crop material and a second detector for detecting hard objects. The feed mechanism includes a hollow feed roll rotatable about a fixed shaft and both detectors are supported by the fixed shaft inside the feed roll. The first detector is a metal detector mounted inside a housing supported by the fixed shaft. The second detector is a thin film microphone for sensing air-borne sound waves produced when hard objects impact the feed roll. The second detector may be mounted on the housing or, alternatively, mounted on a support member attached to the fixed shaft. In either arrangement, a vibration-absorbing pad is provided to isolate the microphone from mechanical vibrations occurring in its supporting structure.

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: 4290255 (1981-09-01), Martenas
patent: 4353199 (1982-10-01), Chow et al.
patent: 4433528 (1984-02-01), Bohman

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