Abstract: A planetary wire-feeding mechanism has a left and right driving roll with hyperboloid profiles in a housing made up of two equal left and right cylinders, with an axis of rotation coinciding with the geometric axis of the electrode wire. The two cylinders contact one another and are joined detachably. In each of them there is shaped semi-cylindrical seats having parts with a common axis perpendicular to the geometric axis of the electrode wire and disposed in the plane of contacts between the two cylindrical parts. In the semi-cylindrical seats there are mounted two identical units, disposed in opposite directions, each unit having a base and two opposite legs, the legs of the two oppositely disposed units being interdigitated when they are mounted within the housing. Such units constitute supporting-guiding components upon which they are disposed on the right and left driving rolls.