Abstract: Quick change attachment for clamping chucks on a machine spindle in which a locking bush (32) is actuated by an axially shiftable locking piston for actuating the chuck clamping, while an adjusting rod (44) adjustable from the clamping cylinder is provided for actuating the clamping jaws of the chuck. Axially secured at the end of the adjusting rod to connect the clamping piston rod with the adjusting rod (44) are coupling pieces (50) which execute plier-like gripping and expanding movements by means of a tipping edge and are actuated from a control bush 58 overlapping them together with the locking bars for the chuck clamping driven by the locking bush (32).

Abstract: A quick-change mount for chucks is incorporated into a rotatable hollow spindle (10) of a machine tool and comprises servo-actuated drive sleeve (32) for power transmission to clamp the chuck (20) to the spindle flange (12). Slidable within the drive sleeve is a servodriven clamping sleeve (46) adapted for having fitted thereto the clamping jaw carrier (70) of the chuck. The clamping sleeve includes an annular series of holes (52) for guiding radially movable coupling element (50), which in order to get into coupling condition are displaced partially into a circumferential groove (72) of the clamping jaw carrier by means of a shifting sleeve (58), and in order to bring about the release condition are enabled to leave said groove for an annular recess (60) of the shifting sleeve (58). The shifting sleeve is spring biased into the condition to bring about the coupling position, from which it can be released by means of a catch member (64), when the fixation of the chuck is removed (FIG. 1).