Patent ID: 8342068

Claim:
A device for longitudinal cutting of a continuous web material, the device defining a path for the web material, a direction of feed, and including, along said path, at least one cutting unit comprising: a plurality of blades disposed on one side of said path, each of the plurality of blades being adjustably positionable transversely to the direction of feed of the web material and cooperating with a fixed counter-blade disposed on the opposite side of said path, the fixed counter-blade including a rectilinear element extending transversely to the direction of feed of the web material, said rectilinear element including a metal bar carried on a section bar made of a softer material than said metal bar; and an interchangeable block made of plastic material associated therewith; wherein said metal bar forms an active part of the counter-blade; wherein said blades and said metal bar are arranged such that said blades skim a rectilinear edge of said metal bar without touching said metal bar; and wherein said path, said metal bar and said blades are arranged such that said blades penetrate into the continuous web material upstream of said interchangeable block, with respect to said direction of feed, wherein said section bar is integral with a base plate, wherein said base plate and said section bar form a retaining channel to house said interchangeable block, and wherein one of said base plate and said section bar has a wall defining a portion of said channel, said wall being between the web material and a portion of the interchangeable block to limit movement of the interchangeable block in a direction of the web material.