Title: Sensor arrangement for harvester of stalk-type row crop

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Abstract: A harvester displaceable along the ground in a transport direction determined by a steering mechanism itself operated by a controller has a sensor formed of a pair of sensor arms pivotal on the harvester about pivot axes spaced apart transverse to the harvester transport direction. These arms are biased into a position extending normally toward and in line with each other and have inner ends which overlap so that displacement of the chassis of the harvester along the ground will bring crop into engagement with these arms and deflect them backwardly. Each of the arms is connected to a potentiometer and these potentiometers are wired in series such that as the one arm is deflected backwardly the resistance of its potentiometer increases and as the other arm is deflected backwardly the resistance of its potentiometer decreases. These potentiometers are connected in series and to the automatic controller of the device which only generates a deviation signal and feeds it to the steering mechanism when the sum of the resistances of the two potentiometers varies from a predetermined set point.


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