Forming unit for a packaging machine and method thereof

A forming unit for a packaging machine, comprising:

• a conveyor configured to convey a flexible packaging material along a conveying direction;
• a forming assembly activatable on the flexible packaging material, and configured to shape the flexible packaging material along a forming direction transverse to the conveying direction to form a package;
• the forming assembly comprising:
• a first discoidal element and a second discoidal element activatable on a respective portion of the flexible packaging material to shape it so as to form a package;
• and
• a first bar and a second bar extending substantially parallel to said conveying direction, wherein the first discoidal element and the second discoidal element are respectively mounted rotatably on both the first and the second bar and wherein the first and second bars are reversibly movable in such a way as to move the first discoidal element and the second discoidal element reciprocally nearer and/or farther apart;
• an adjustment element associated with the forming assembly and configured to move it nearer and/or farther away along the forming direction, so as to adjust a transversal dimension of the package, wherein the adjustment element comprises an articulated mechanism activatable on the said first bar and the second bar in such a way as to allow a substantially synchronous movement thereof along the forming direction.