Abstract: An adjusting device for the cutting blades of a cutting tool, especially of an annular cutting tool according to which the cutting blades have associated therewith at least one abutment which is adjustable for adaptation to the extent of the wear of wear plates or corresponding machine parts of the cutting tool. The device furthermore includes a setting device for adjusting the cutting blades so as to occupy their abutting positions.

Abstract: A blade holder for machine blades, especially for blades which are arranged in an annular fashion along the periphery of cutting tools. The blade holder has a blade carrier and a blade holding plate which is detachably mounted on the blade carrier by at least one bolt. The blade holding plate at least partially covers the blade, which is supported on the blade carrier, while leaving the cutting edge exposed. The blade holder plate, which is removable from the bolt, is provided with an opening for a nut which is seated on the bolt.

Abstract: A cutting device having concentric counter-rotating cutter rings thereon with the outer ring having end members with support members extending axially therebetween. Cutter packets are detachably mounted on the radially outer side of said support members and are clamped in place by spring biased clamping bars. The housing of the device includes motor operated lift members engageable with said bars singly in respective rotated positions of said outer ring for unclamping said packets for replacement. Each packet has a support plate and a cutter blade adjustably connected thereto.