US Patent 7621476 Cutter knife

The invention relates to a cutter knife (8), a cutter head disk (1) and a system including the inventive cutter head disk and the inventive knife, wherein the cutter knife includes a longitudinal bore enabling only one cutter knife to be arranged on the cutter head disk, the longitudinal bore thereof being compatible with the pin. The scaling on the longitudinal bore makes it possible to verify the position of the cutter knife in relation to the cutter head disk.