Metal detecting device for a crop conveyor

摘要

A metal detecting device for a crop conveyor has several closely spaced permanent magnets fixed within a hollow feed-roller in parallel with the shaft thereof. One pole of each magnet is directed radially outwardly such that its magnetic field penetrates through the hollow feed-roller and an adjoining crop-feed slot from inside to out, and wherein said magnetic field also passes axially through a respective sensor winding that is likewise arranged within the hollow feed-roller.