Patent ID: 6431491
Filing Date: 2002-08-13
Classification: B26D,B26F,Y10T

Abstract:
A perforating unit for a weblike material comprising:a support with at least two fixed counterblades; a first roller revolving about its own axis and carrying a first series of rotary blades acting in combination with a first one of said fixed counterblades; and a second roller revolving about its own axis and carrying a second series of rotary blades acting in combination with the second one of said fixed counterblades; wherein the blades of said first series being arranged at a different pitch from the blades of the second series of blades, alternatively said first or said second roller cooperating with the respective counterblade; and wherein the perforating unit includes two alternative paths for said weblike material, a first one of said paths passing between said first roller and said first counterblade and a second one of said paths passing between said second roller and the second counterblade.