An agricultural machine, moving during work in a direction of forward travel along a ground, and comprising:
- a hitching support;
- at least one tool or group of tools having, in a work position, an extension transverse to the direction of forward travel and projecting laterally with respect to the hitching support, the tool or group of tools being configured to be transferred about a transfer axis alternately between the work position, in which the tool or group of tools rests at least partially on the ground, and at least one raised position, in which the tool or group of tools is distant from the ground;
- at least one mounting arm which is connected to the hitching support via a first articulation and a second articulation, the second articulation being offset forward, in the direction of forward travel, with respect to the first articulation, at least in the work position, the at least one mounting arm being connected to the tool or group of tools at an assembly site that is offset toward an opposite end of the at least one mounting arm to the first and second articulations;
- and
- a safety device by which the tool or the group of tools is configured to perform a safety movement under the effect of sufficient pressure exerted on the tool or the group of tools in an opposite direction to the direction of forward travel, the safety movement comprising at least a first phase of movement of which one component is a rearward rotation with respect to the direction of forward travel and with respect to the hitching support,
- wherein the first and second articulations together define the transfer axis, and
- wherein the safety device comprises at least one guide device incorporated into the at least one mounting arm that is configured to allow a variation of a first distance between the second articulation and the assembly site when the rearward rotation takes place, or a variation of a second distance between the first articulation and the assembly site when the rearward rotation takes place.