Machine tool comprising a machine spindle, a tool holder and...

B - Operations – Transporting – 23 – Q

Patent

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Details

B23Q 1/00 (2006.01) B23Q 3/12 (2006.01)

Patent

CA 2750480

The invention relates to a machine tool comprising a motor-driven machine spindle (12) which can be rotated about a spindle axis (20). The machine spindle comprises a tool holder (28) arranged at the face. A tool is exchangeably arranged on the machine spindle (12). The tool has a coupling element (32) which is compatible with the tool holder (28) of the machine spindle (12). The coupling element (32) has a rear surface (34) pointing toward the machine spindle (12). The tool holder (28) comprises a face (30) arranged opposite of the rear surface (34) of the coupling element (32). The machine tool comprises at least one galvanic contact point (38) for the electric current or data transmission, said point being arranged between the machine spindle (12) and the tool (36) and rotating together with the machine spindle (12). The galvanic contact point (38) has a contact element (44) which is arranged at the face (30) of the tool holder (28) on the spindle side, and a contact element (46) which is arranged on the rear surface (34) of the coupling element (32) on the tool side. The contact element (44) arranged on the spindle side and the contact element (46) arranged on the tool side can be moved relative to each other by the action of a centrifugal force component occurring during the rotation of the machine spindle (12) about the spindle axis (20) and can be pressed against each other to make contact.

L'invention concerne une machine-outil comprenant une broche (12) entraînée en rotation autour d'un axe de broche (20) par un moteur. La broche (12) présente, côté avant, un logement d'outil (28). Une machine-outil remplaçable peut être disposée sur la broche (12). La machine-outil présente un élément de couplage (32) compatible avec le logement d'outil (28) de la broche (12). L'élément de couplage (32) présente une surface arrière (34) tournée vers la broche (12). Le logement d'outil (28) comprend une face frontale (30) opposée à la face arrière (34) de l'élément de couplage (32). La machine-outil présente au moins un point de contact galvanique (38) qui est destiné à la transmission de courant électrique ou de données et qui se trouve entre la broche (12) et la machine-outil (36) et qui tourne conjointement avec la broche (12). Le point de contact galvanique (38) a un élément de contact (44) côté broche, disposé sur la face frontale (30) du logement d'outil (28), et un élément de contact (46) côté outil, disposé sur la face arrière (34) de l'élément de couplage (32). L'élément de contact (44) côté broche et l'élément de contact (46) côté outil sont mutuellement mobiles sous l'action d'une composante de force centrifuge générée par la rotation de la broche (12) autour de l'axe de broche (20) et peuvent être pressés l'un contre l'autre avec mise en contact.

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