Rotary welding device and related method

A rotary device for welding a continuous web, preferably for making absorbent articles or for making packs or pouches for containing liquid or solid products, comprising a rotary means rotating about a respective axis of rotation, a plurality of welding units for welding the continuous web and mounted on the rotary means in such a way as to be angularly spaced from each other, each welding unit being configured to pass from a non-operating position to an operating position, and vice versa, during the rotation of the rotary means;

• movement means are configured to vary the radial position of the welding units by moving them towards or away from the axis of rotation of the rotary means;
• at least one first supporting element and at least one second supporting element for supporting the continuous web and disposed, respectively, upstream and downstream of the same welding unit with reference to the rotation direction of the rotary means, to keep the continuous web tensioned when the welding unit is at the operating position;
• the first supporting elements and the second supporting elements associated with the respective welding units are supported by a load-bearing structure connected to the welding units in such a way that a radial movement of the welding units corresponds to a movement of the first supporting elements and of the second supporting elements towards and away from the axis of rotation of the rotary means.