Haymaking machine

A haymaking machine, particularly for windrowing forage, comprising a frame carrying several windrowing rotors which can be driven in rotation about substantially vertical support axes, which rotors are connected to carrier arms which are articulated to the frame by means of articulation axes about which they can be moved from a substantially horizontal work position into a substantially vertical transport position and vice versa, said carrier arms each being made as two telescopic parts of which the first is connected to the axis of articulation on the frame and the second carries the corresponding rotor, it being possible for this second part to slide with respect to said first part in order to vary the position of the corresponding rotor with respect to the frame between an inner position in which its support axis is located a minimum distance d from the articulation axis of the corresponding carrier arm and an outer position in which its support axis is located a maximum distance D from said articulation axis, wherein the first telescopic part of at least one carrier arm comprises an additional guide section which extends in its continuation beyond the support axis of the corresponding rotor when the latter is located in the inner position and the length of which is such that it allows the corresponding second telescopic part to be guided as far as an outer position in which the value of the distance D is substantially twice the value of the distance d.