The device for preventing a collision between a part of the cutting arm (1) and a part of the loading ramp (4) comprises transmitter means (11, 12) designed as hydraulic cylinder-piston-arrangements (13, 14; 19, 21) checking the position of the cutting arm (1) and the loading ramp (4) relative to the cutting machine. The working spaces (24, 29) of the transmitter means (11, 12), which become reduced on downward movement of the cutting arm (1) and on upward movement of the loading ramp (4), are connected via conduits with the working space (27) of a hydraulic piston (31) forming the receiver means (28). The piston (31) is, when be shifted, actuating a switching member (34) for interrupting the movements of the cutting arm (1) and of the loading ramp (4) (FIG. 2).
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