Position drive in particular for use in machine tools, and...

B - Operations – Transporting – 23 – B

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Details

B23B 29/034 (2006.01) B23B 5/40 (2006.01) B23B 31/08 (2006.01) B23C 3/05 (2006.01)

Patent

CA 2213535

Position drive, in particular for use in machine tools, and tool head having such a position drive The 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 servesto move at least one tip holder or cutting tool (76). Further, an electric motorarrangement (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 thrustmember (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).

La présente invention concerne une commande de positionnement pour tête porte-outil de machines-outils. La tête porte-outil comprend le corps principal (12), l'arbre (16) de la machine qui, couplé à un axe rotatif (14), se prolonge dans le sens axial au delà du corps principal (12), et un membre de poussée (18) pouvant être déplacé par rapport au corps principal (12) et qui permet d'ajuster la position d'au moins un outil de coupe ou un porte-outil. Le corps principal abrite aussi un moteur électrique (24) couplé avec le membre de poussée (18), ainsi qu'un bloc d'alimentation (26) pour le moteur. Afin d'obtenir un moteur performant de conception compacte, il a été prévu, dans le corps principal, un arbre creux (50) qui, sous l'impulsion du moteur, entre en rotation autour d'un axe concentrique par rapport à l'axe de déplacement (52) du membre de poussée (18), et qui présente un filetage interne en prise avec le filetage externe (42) dudit membre de poussée (18), ainsi qu'une couronne dentée (62) à mouvement de rotation concentrique par rapport au filetage extérieur (42), qui s'engage dans au moins l'un des pignons (68) montés sur l'arbre de sortie (68).

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