A machine for working the ground comprising a movable chassis with a front part and a rear part considered relative to the movement direction of the chassis and assemblies for working the ground, the chassis having at least one crosspiece extending transversely to the front/back direction of the chassis, and at least two assemblies for working the ground which can be coupled to the crosspiece each comprising: - a yoke, - a tool-holder arm mounted on the yoke such that it can pivot about an axis parallel to the longitudinal axis (XX') of the crosspiece when said assembly is coupled to the crosspiece, in particular to allow the tool for working the ground to be retracted by lifting when it encounters an obstacle, - a spring for returning the arm to the position of the tool bearing on the ground comprising a so-called spiral intermediate part and two branches which are connected to one another by said spiral part, and - a pivoting structure for prestressing the spring, the pivoting arm coupled to one of the branches of the spring and the active pivoting structure by bearing on the other branch of the spring being mounted on the yoke able to pivot about the same axis around which the spiral part of the spring is at least partially wound, to allow, when the pivoting structure is made to pivot by at least one movement-driving device equipping the machine, prestressing of the spring based on relative angular positions of the arm and the pivoting structure, characterized in that for the or at least one of the crosspieces of the chassis, the or at least one of the movement-driving devices equipping the machine is common to at least several assemblies for working the ground arranged side by side and coupled to said crosspiece and comprises at least one rod parallel to the crosspiece, an actuator moving the rod parallel to itself in the direction moving closer to or further from the front part of the chassis, in that the pivoting structure of the assemblies for working the ground mounted on the crosspiece is a pivoting lever which can be coupled by snapping-fitting to the rod to allow, in parallel with the movement of the rod, a pivoting movement of the levers, and in that each assembly for working the ground supported by the crosspiece is coupled individually to the crosspiece by at least one connecting member extending between the yoke of said assembly for working the ground and the crosspiece. - a yoke, - a tool-holder arm mounted on the yoke such that it can pivot about an axis parallel to the longitudinal axis (XX') of the crosspiece when said assembly is coupled to the crosspiece, in particular to allow the tool for working the ground to be retracted by lifting when it encounters an obstacle, - a spring for returning the arm to the position of the tool bearing on the ground comprising a so-called spiral intermediate part and two branches which are connected to one another by said spiral part, and - a pivoting structure for prestressing the spring, the pivoting arm coupled to one of the branches of the spring and the active pivoting structure by bearing on the other branch of the spring being mounted on the yoke able to pivot about the same axis around which the spiral part of the spring is at least partially wound, to allow, when the pivoting structure is made to pivot by at least one movement-driving device equipping the machine, prestressing of the spring based on relative angular positions of the arm and the pivoting structure, characterized in that for the or at least one of the crosspieces of the chassis, the or at least one of the movement-driving devices equipping the machine is common to at least several assemblies for working the ground arranged side by side and coupled to said crosspiece and comprises at least one rod parallel to the crosspiece, an actuator moving the rod parallel to itself in the direction moving closer to or further from the front part of the chassis, in that the pivoting structure of the assemblies for working the ground mounted on the crosspiece is a pivoting lever which can be coupled by snapping-fitting to the rod to allow, in parallel with the movement of the rod, a pivoting movement of the levers, and in that each assembly for working the ground supported by the crosspiece is coupled individually to the crosspiece by at least one connecting member extending between the yoke of said assembly for working the ground and the crosspiece.