Rotary welding device

A rotary welding device comprising a rotary part rotating about its axis of rotation, one or more supporting elements for supporting a continuous strip, specifically of absorbent articles, supported by the rotary part, and a plurality of welding units, mounted on the rotary part, for welding the continuous strip;

• each welding unit is configured to pass from a non-operating position to an operating position and vice versa;
• each welding unit comprises a respective welding tip and a respective anvil element which is movable relative to the welding tip;
• preferably, the welding tip of each welding unit is directed towards the inside of the rotary part and the respective anvil element towards the outside of the rotary part;
• each welding unit comprises respective first movement means configured to drive the anvil element in rotation relative to the welding tip from an initial position, where the anvil element is angularly spaced from the welding tip, to a final position, where the surface of the welding tip and the surface of the anvil element are parallel and aligned with each other along the same axis, and vice versa;
• first drive means drive the first movement means to cause the anvil element to pass from the initial position to the final position and vice versa;
• wherein:
• the first movement means of each welding unit comprise at least one articulated system comprising a crank, a conrod, connected to the crank, and a lever, connected to the conrod, for supporting the anvil element and oscillating about an axis of oscillation (21a);
• the oscillation of the lever causing the anvil element to be driven angularly relative to the welding tip from the initial position to the final position, and vice versa.