Abstract: The pruning head (1) includes a rotor (10) in the shape of a shaft, radially bearing flexible or supple elongated pruning elements (11, 11?, 1?). This head is essentially characterized in that each elongated pruning element (11, 11?, 11?) includes, at at least one of the ends of same, and at a distance from the axis of rotation of the rotor (10), a weight (110, 110?, 110?, 110??) capable of shearing off undesirable growths formed at the foot of vines and other plants.

Abstract: A device for controlling the positioning of two elements, one of which is stationary while the other is mobile and driven by a geared motor member, the position of the mobile element being controlled by that of a trigger, includes: a circuit; a first stationary Hall effect sensor connected and, together with a magnet borne by the mobile element, providing a negative or zero clearance positioning of the two elements; and a second Hall effect sensor connected to the control circuit and, together with a magnet borne by the mobile element, providing the maximum clearance positioning of the two elements. The magnet is positioned such that its north-south axis is perpendicular to the trajectory of same and the first sensor is disposed in an area where the field vector of the magnet has a component perpendicular to the north-south axis, the sensitive face of the first sensor being parallel thereto.