Interfolding machine and method for varying a length of sheet articles produced by the interfolding machine

An interfolding machine for production of interfolded packs of sheet articles from strips comprising:

• a first roller unit which comprises a cutting tool and a first roller, for guiding a strip, which bears the cutting tool;
• a frame which comprises a seat which houses the first roller unit;
• movement means which move the first roller in rotation with respect to the frame about a rotation axis;
• a first cutting tool;
• a beam which bears the first cutting tool and which is fixed to the frame in a first position in which the first cutting tool has a relative first position with respect to the rotation axis so as to cut or score the strip with the cutting tool of the first roller unit;
• wherein the first roller unit is interchangeable with another roller unit so as to vary the distance between the cuts or scores on the strip and therefore the length of the sheet articles, characterised in that it comprises a second cutting tool and in that the beam brings the second cutting tool into a different position with respect to the first cutting tool and is fixable to the frame in a second position in which the second cutting tool has a relative second position with respect to the rotation axis, different to the relative first position, so as to cut or score the strip with the cutting tool of the other roller unit.