| 摘要 |
The invention relates to a device for removably securing a tool (12) to the spindle (10) of a machine tool with a fitting aperture (16) concentric with the spindle axis, a fitting pin (18) engaging in the fitting aperture (16), two clamping bolts (26) arranged in the fitting pin so as to be radially movable towards opposite sides, a clamping member (32) movable axially by means of a tensioning mechanism fitted on the spindle side and two tapered surfaces (48, 30) arranged in opposing pairs fitted on the clamping member (32) on the one hand and on the clamping bolts on the other for the radial adjustment of the clamping bolts (26) between a release position withdrawn in the fitting pin (18) and a clamping position shifted radially outwards. In order to be able to clamp large tools securely even with a relatively short axial clamping travel of the central securing and clamping mechanism on the spindle side, it is proposed according to the invention for the clamping member (32) and the clamping bolts (26) to have a transverse groove (50, 52) limited by transverse sides in the region of their facing taper surfaces (48, 30) by means of which the taper surfaces are divided into two partial surfaces arranged at a distance from each other. In the release position, one of the partial surfaces (48'', 30') engages in the opposite transverse groove (50, 52) in the manner of a toothed gear, while in the clamping position both partial surfaces (30', 48', 30'', 48'') lie mutually opposite in pairs. |
