The machine has a self-steering vehicle (1) carrying a cutter/reaper mechanism (2) with a conventional location device (OV1) for detecting the edge of the crops, especially the boundary (EK) between the cut and uncut crop. The position signal (OS1) generated by the location device is processed by a regulator (3) and used for automatic steering by a conventional arrangement. The edge of the crop is detected at least two distances (A1,A2) in front of the cutting mechanism. The regulator processes at least two corresp. signals which are used for the automatic steering.
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