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AssigneeKomet Group GmbH
InventorsWolfgang Bierl, Juergen Fronius, Heiko Graf, Ewald Hasselkuss, Roland Hoerl
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The invention relates to a machine tool comprising a motor-driven machine spindle which can be rotated about a spindle axis. The machine spindle comprises a tool holder arranged at the face. A tool is exchangeably arranged on the machine spindle. The tool has a coupling element which is compatible with the tool holder of the machine spindle. The coupling element has a rear surface pointing toward the machine spindle. The tool holder comprises a face arranged opposite of the rear surface of the coupling element. The machine tool comprises at least one galvanic contact point for the electric current or data transmission, said point being arranged between the machine spindle and the tool and rotating together with the machine spindle. The galvanic contact point has a contact element which is arranged at the face of the tool holder on the spindle side, and a contact element which is arranged on the rear surface of the coupling element on the tool side. The contact element arranged on the spindle side and the contact element 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 about the spindle axis and can be pressed against each other to make contact.
A machine tool (10) having a motor-driven machine spindle (12, 212) which can be rotated about a spindle axis (20, 320) and has an end-side tool holder (28, 228), and having an inserted tool (36) which is arranged exchangeably on the machine spindle (12, 212) and has a coupling element (32, 232) which is compatible with the tool holder (28, 228) of the machine spindle (12, 212) and has a rear face (34, 234) which points to the machine spindle, having an end face (30, 300) which comprises the tool holder (28, 228) and lies opposite the rear face (34) of the coupling element (32), and having at least one corotating galvanic contact point (38) for electric current or data transmission, which contact point (38) is arranged between the machine spindle (12, 212) and the inserted tool (36) and has a spindle-side contact element (44, 132, 348) which is arranged on the end face (30, 300) of the tool holder (28, 228) and a tool-side contact element (46, 142, 342) which is arranged on the rear face (34) of the coupling element (32), characterized in that the spindle-side contact element (44, 132, 348) and the tool-side contact element (46, 142, 342) can be moved relative to one another, under the action of a centrifugal force component which occurs during the rotation of the machine spindle (12, 212) about the spindle axis (20, 320), and can be pressed against one another with the production of contact.
Dependencies are inferred from the claim text.