| 摘要 |
PCT No. PCT/DE96/00237 Sec. 371 Date Aug. 29, 1997 Sec. 102(e) Date Aug. 29, 1997 PCT Filed Feb. 12, 1996 PCT Pub. No. WO96/27468 PCT Pub. Date Sep. 12, 1996The invention relates to a position drive for a tool head for use in machine tools. The tool head comprises a base body (12), a tool shank (16) which protrudes axially over the base body (12) and is coupleable to a rotating machine spindle (14), and a thrust member (18) which is movable with respect to the base body (12) and which serves to move at least one tip holder or cutting tool (76). Further, an electric motor arrangement (24), which is coupleable to the thrust member (18), and a power supply device (26) for the motor arrangement (24) are positioned on the base body (12). In order to ensure a compact construction having an efficient motor arrangement, a hollow shaft (50) is borne rotatable about an axis of the base body (12), which is concentric with respect to a displacement axis (52) of the thrust member (18), and the hollow shaft (50) has an internal thread which engages in an external thread (42) of the thrust member (18). The hollow shaft (50) has a toothed ring (62) which is positioned concentric with respect to the external thread (42), for the engagement of at least one gear (70) which is positioned on a driven shaft (68) of the motor arrangement (24).
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