Metal detection in the vicinity of ferrous boundaries

Details Metal detection in the vicinity of ferrous boundaries Metal detection in the vicinity of ferrous boundaries

1988-01-13

1988-12-06

Hirsch, Paul J.

Harvesters

Motorized harvester

With condition-responsive operation

340684, A01D 7518

Patent

active

047888130

ABSTRACT:
In a forage harvester having a metal detector with permanent magnets located within a crop feed roll, additional permanent magnets are positioned beyond the ends of the feed roll and at a distance greater than the radius of the feed roll from the axis of rotation of the feed roll. The additional magnets cooperate with magnets within the feed roll to provide a more uniform flux density across the width of the feed roll, even in regions near ferrous side sheets defining the lateral limits of the harvester feed path. Tramp metal is thus detected with equal facility regardless of its trajectory past the feed roll.

REFERENCES:
patent: 3747501 (1973-09-01), Bennett, Jr. et al.
patent: 3896608 (1975-07-01), Garrott
patent: 3959953 (1976-06-01), Garrott
patent: 3972156 (1976-08-01), Bennett, Jr.
patent: 4322937 (1982-04-01), Hollmann
patent: 4344074 (1982-08-01), Strosser et al.
patent: 4353199 (1982-10-01), Chow et al.
patent: 4433528 (1984-02-01), Bohman

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