Patent ID: 8454283

Claim:
A motor-driven working spindle for a machine tool comprising: a casing with a central longitudinal axis extending from a front of the spindle to the rear of the spindle; a shaft mounted for rotation in the casing; a receptacle arranged on a front end of the shaft, in which receptacle, by means of a clamping device, a machining tool is releasably clampable; a pull rod mounted for displacement in the shaft, whereby the clamping device may be actuated by the pull rod; a spindle advancing drive coupled to the shaft and positioned in the casing; wherein the shaft is mounted in the casing for displacement by the spindle advancing drive through a working stroke in the direction of the central longitudinal axis; an end wall positioned in the casing, wherein the pull rod may be seated against the end wall by moving the pull rod in the direction of the central longitudinal axis; and wherein the shaft is displaceable, by means of the spindle advancing drive, relative to the pull rod that is seated against the end wall, for releasing the clamping device; an electromotive spindle rotary drive coupled to the shaft and arranged in the casing, the spindle rotary drive comprising; a rotary drive stator and a rotary drive rotor, wherein the rotary drive stator surrounds the shaft and is mounted in the casing; and wherein the rotary drive rotor is fastened to the shaft; and, wherein the spindle advancing drive is to the rear of the rotary drive, and the end wall is to the rear of the spindle advancing drive.