WERKZEUGMASCHINE

摘要

A machine tool comprises a spindle stock (11) in which a spindle (13) is seated for rotation about a spindle axis (14). The spindle (13) is provided with a receptacle (20) for the taper (21) of a toolholder (22). A first annular groove (31) is arranged in a stationary ring bearing (12) of the spindle stock (11), adjacent a first end of at least one duct (34) provided in the rotatable spindle (13), the other end of which terminates in a blow-off outlet (35) opening into the receptacle (20). The first annular groove (31) can be connected to a compressed-air source (38). In the stationary condition of the spindle (13), an elastic annular seal (42, 43) can be applied in sealing relationship between the stationary bearing ring (12) and the spindle (13), on both sides axially of the first annular groove (31), by the action of compressed air. A second and a third annular groove (40, 41) are arranged in the ring bearing (12), on either side of the said first annular groove (31) in the axial direction. An annular seal (42, 43) is accommodated in each of the second and the third annular grooves (40, 41). The annular seals (42, 43) accommodated in the second and third annular grooves (40, 41) can be subjected to the action of compressed air (49) applied in radial direction, from the side opposite the said spindle (13) (FIG. 1).