Abstract: A chipper knife (1) is fastened in a chuck (2). The knife has two supporting faces (15,14), which lie against two faces (25,24) in the chuck.The fastening of the tool can be improved if the rear supporting face (15) of the knife is provided with at least one finger (1a), which fits into a recess in the chuck (2) and whose bottom face constitutes at least a part of the bottom supporting face (14) of the knife.

Abstract: Cutter head especially for a canter-chipper or chipper-edger comprising a body mounted on a shaft of rotation and cutting knives fastened on the body. The cutting knives form parallel cutting paths. The cutting knives in the cutting paths next to the log having a cutting width of about 8-25% of the total cutting width of the cutter head are mounted on an easily removable ring facilitating the replacement of these swiftly wearing cutting knives.

Abstract: A cutter head the entire cutting width of which is divided into a few parallel cutting strips defined by respective sets of cutting knives. The diameters of the cutting circles of the knives of the different sets increase stepwise in the direction away from the log. The angle of inclinaton of the main cutting edge of the knives in relation to the axis rotation of the cutter head is large in the case of the knives defining the cutting strips placed closest to the log and small in the case of the knives defining the cutting strips placed more distant from the log.