If it is not possible to use pegs and tight wire, the scarifier cutter machine is equipped with a long linear bar positioned at the side of the machine itself and resting on the road surface, in such a way as to define a median plane that is followed by the machine in operation.

Besides these devices, which substantially control the cutting depth, there are also devices that show the inclination of the cutting drum with respect to the road surface, in such a way as to remove different quantities of asphalt on the left and on the right side of the drum, respectively, and to obtain a given road profile, for example with sloping sides.

More generally, road scarifiers are provided either with sensors positioned on the left and on the right side of the machine and suitable for measuring the distance between the sensor and the cutter contact surface, and with devices controlling the inclination of the cutting drum.

At present these data are read and managed by the machine operator in a non-coordinated way, which means that if the machine must drive the cutter into the road surface for a given depth - for example the same depth on the right and left side - the operator of the machine must programme the right depth control instrument and the left depth control instrument separately, presetting a certain working depth for the right and left sides of the road.

According to the known technique, therefore, the right and left scarification depth control devices cannot exchange information in order to correct any deviation from the preset parameters.

Practically, according to the technique used at present there is no interdependence between the measured parameters regarding right depth, left depth and inclination, which would ensure the complete control of the cutting profile to be obtained.

The aim of the present invention is to overcome the limitations of the known technique.

The main aim of the invention, in fact, is the implementation a road scarifier for the cutting of road surfaces that constantly ensures that the work of the cutting drum on the road surface is performed in such a way as to obtain the desired profile, and therefore following preset parameters.

Said profile should also be automatically respected by the scarifier cutter, which means that during the operation of the machine automatic correction in response to deviations from the preset parameters should be possible.

Another object of the invention is to facilitate the work for the operator of the machine, by grouping on a single panel the controls regarding the parameters of the scarification profile to be obtained, that is, the right depth, left depth and inclination parameters of the road surface removed.

A further aim to be achieved is that the scarifier control system should make it possible to operate the machine by setting only two of the three parameters of the scarification profile to be obtained, while the third parameter should be derived from the other two.

Another aim of the invention is the implementation of a machine equipped with a device that, whenever a deviation from the preset parameters takes place, intervenes with an automatic correction procedure acting directly on the components that vary the position of the machine and of the cutting drum with respect to the road surface on which the work is being performed.

All the aims mentioned above and others that will be described in greater detail below have been achieved through the implementation of a road scarifier for cutting road surfaces, comprising: a frame provided with at least one cutting drum, preferably supported by tracks by means of hydraulic actuators suitable for modifying the relative position of said frame and said tracks, in such a way as to modify the axis of said cutter with respect to the road surface; driving means to obtain the setting in motion of the machine and the rotation of said cutter; right and left sensors arranged at the sides of the machine and suitable for showing the relative distance between said sensors and the road surface;

Sensors to show the inclination of said machine with respect to the horizontal plane, said road scarifier being characterized in that each of said right and left sensors and said inclination sensor sends signals to first programming and controlling data processing systems, said first data processing systems being suitable for comparing the signals received with preset signals and for emitting difference signals that are received by a second data processing system capable of sending control signals to hydraulic actuators connected to the frame of the machine, in such a way as to reduce to zero the difference signals sent out by said first data processing systems.

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