Abstract: A method for building green tyres includes: feeding an elementary semifinished product with a feeding apparatus; associating an anthropomorphic robotized arm with a forming drum; sending movement commands to the arm to move the forming drum in a working zone, the forming drum being moved while the feeding apparatus is feeding an elementary semifinished product, so that it is laid on the forming drum. Movement commands are sent to the arm, including: determining target coordinates for the arm in order to move the forming drum in the working zone; modifying the target coordinates by a correction function associated with the arm and the working zone, and using the modified coordinates for such movement commands.

Abstract: A variable displacement rotary vane pump for fluids is provided where displacement regulation is achieved thanks to the variation of the relative eccentricity between a regulation ring (11) in which a rotor (13) is arranged and the rotor itself. In a region of engagement between the external surface (11A) of the regulation ring (11) and the internal surface (40A) of a chamber (40) inside which the regulation ring (11) moves, a plurality of rolling elements (25), mounted in fixed position, is provided. The rolling elements (25) are provided only over a portion of such a region of engagement, including a zone (S) where a resultant of mechanical and fluidic forces generated in the pump during the regulation acts. A method of regulating the displacement of such a pump is also disclosed.