Welding device for making and hermetically sealing at least one package containing a product

A packaging machine, comprising:

• a supply device that supplies at least one film along a given direction;
• at least one forming unit adapted to form the film so as to make two tubular envelopes advancing parallel to each other along the given direction;
• a supply unit for supplying a product and configured to supply a succession of products so that the products are arranged inside the tubular envelopes;
• and
• a packaging unit comprising a rotary drum and a plurality of welding devices, wherein each welding device comprises:
• first sealing and cutting equipment, the first sealing and cutting equipment configured to receive a first tubular envelope and to seal the first tubular envelope transversally, the first sealing and cutting equipment comprising a first cutting blade adapted to separate a portion of the first tubular envelope for making a first package containing a first product;
• and
• second sealing and cutting equipment, the second sealing and cutting equipment configured to receive a second tubular envelope and to seal the second tubular envelope transversally, the second sealing and cutting equipment comprising a second cutting blade adapted to separate a portion of the second tubular envelope for making a second package containing a second product;
• a support body bearing both the first sealing and cutting equipment and the second sealing and cutting equipment, whereby the first sealing and cutting equipment and the second sealing and cutting equipment are aligned to each other and arranged in opposite positions along an extension direction of said support body, the support body being connected to a rotary drum of a packaging machine;
• wherein both the first sealing and cutting equipment and the second sealing and cutting equipment respectively comprise an arm and an abutment body, the arm being rotatably constrained with respect to the support body and reversibly movable between an active position in which the arm is substantially abutting the abutment body, and an inactive position in which the arm is raised with respect to the abutment body;
• and
• wherein each arm comprises a portion of a common locking mechanism fixed on the support body in a central position between both arms, the locking mechanism being adapted to simultaneously lock both arms in the active position, and-wherein the welding devices are associated with the rotary drum, the rotary drum being rotatable about a transverse horizontal axis of rotation, perpendicular to the supply direction of the film.