Abstract: A tool magazine of a tool handling machine which carries several similar tools comprises a unit which can be removed from the tool machine. The tools are conducted between guide rails in a lengthwise shiftable manner. The lengthwise feed of the tools in the tool magazine takes place by means of a feed comb whose comb teeth are moved transversely into engagement between the individual tools. The feed comb carries out a driven feed movement in a lengthwise direction of the magazine. The tools are moved from the tool magazine by a tool gripping device and conducted to a tool fixture of the tool machine. Conversely, the expended tools are moved into the tool magazine by a tool gripping device.

Abstract: The output shaft of a rotary drive motor is connected to a screw shaft which is disposed on the same axis as the output shaft. The screw shaft is rotatably mounted in an axial bearing in a housing, and engages an internal screw element (nut) fixed to a thrust body which is axially displaceable in the housing. A drive rod is rotatably mounted in the thrust body. In order to reduce the longitudinal dimension of the device, the free end of the screw shaft extends into a bore hole in the end of the drive rod, which rod serves to axially displace a thrust bar for adjusting a drilling tool in a drill head.

Abstract: A tool has independently radially adjustable cutting edges. Adjusting drives are provided for each cutting edge. Each adjusting drive is laterally spaced from, and axially overlaps, an adjacent adjusting drive. Each adjusting drive comprises a servomotor which directly drives a screw. A screw nut is axially movable on the screw and is rigidly connected by means of a bridge with an adjusting piston arranged parallel thereto. The adjusting piston is axially movable and is connected by a bearing to a tubular connecting rod. Axial movement of the latter serves to radially adjust an associated cutting edge of the tool. The connecting rods of the adjusting drives are coaxially and telescopingly arranged.