Mounting arrangement for a cutting blade in a cutting head

A mounting arrangement for supporting, in a stepwise adjustable fashion, a cutting blade in a cutting head for working wood or plastic, said cutting blade having at least one cutting edge and opposite side edges with cut-outs therein, the cut-outs forming opposite side edge areas with a recessed wave profile structure ground into each said side edge area, claw elements mounted on said cutting head and disposed fully within said cut-outs, each claw element having an engagement structure in form-fitting engagement with a corresponding one of the wave profile structures ground into said opposite side edge areas for firm engagement between said cutting blade and said claw elements, said wave profile structures ground into the side edge areas of said cutting blade having a length in the longitudinal direction of said side edges of said cutting blade which is greater than that of the engagement structures of said claw elements by at least one wave length of said wave profile structures so as to permit adjustment of the position of the cutting blade by at least one step.