Adjusting drive for a hollow control rod, axially displaceable in a rotating machine-tool spindle, of a tool chucker provided in the spindle

摘要

The adjusting drive for a hollow control rod (3), axially displaceable in a rotating machine-tool spindle, of a tool chucker provided in the spindle has a cylinder housing (6) arranged so as to be fixed in terms of rotation and having a piston (4) which is axially movable in the cylinder housing (6) and can be brought into interaction with the control rod (3). The control rod (3) is guided through the piston (4) in an axially displaceable manner. To feed a gaseous or liquid medium, a feed tube (17) is provided, the outer end (17a) of which is screwed to the free end (3a) of the control rod (3) and which is mounted by means of ball bearings (18) in an attachment housing (10) axially displaceable together with the control rod (3). A mechanical face seal (20) is arranged between the inner end (17b) of the feed tube (17) and a feed bore (19) provided in the attachment housing (10). The cylinder housing (6) has a housing extension (6a) which encloses the attachment housing (10). With a ball guide (12) or sliding bearings (13) in between, the attachment housing (10) is radially supported in the housing extension (6a), is mounted in an axially displaceable manner and is secured against rotation. IMAGE