Cutting method and unit in a packaging machine in extensible film

A cutting method in a packaging machine of products (11) in extensible film that are fed forwards in continuous, comprising the following steps:

• feeding the products wound in a continuous packaging or a bundle of products, to a cutting unit (16);
• cutting, with said cutting unit (16), said continuous packaging or bundle of products into finished groups of products (11) arranged in said extensible film;
• by,
• effecting said cutting of said continuous packaging or bundle of products with a movable cutting device (51, 52) of said cutting unit, said movable cutting device (51, 52) being moved forwards at a same advance rate as said continuous packaging or bundle of products to be cut, and
• implementing said step by effecting, with said movable cutting device in movement, a transversal cut of a perimeter of said continuous packaging or bundle of products which is moving forwards;
• and
• in a subsequent step, bringing said movable cutting device back with respect to said continuous packaging or bundle of products that is moving forwards and effecting a new cutting step with said cutting unit,
• wherein said cutting step of said continuous packaging or bundle of products that is moving forwards is effected simultaneously in two points of said continuous packaging or bundle of products, said two points being at a distance (d) from each other in a direction of said continuous packaging or bundle products that is equal to a finished packaging (18),
• wherein in a first point of said continuous packaging or bundle of products, the cutting is effected at two vertical locations, and
• wherein at two horizontal locations the cut is made in a second point of said continuous packaging or bundle of products so that by consecutively repeating the step of cutting the continuous packaging or bundle of products simultaneously in said two points, a finished packaging is created.