Spindle of a machine tool
AssigneeFortuna-Werke Maschinenfabrik GmbH
InventorRichard Jesinger
Life of this patent
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Abstract
A spindle of a machine tool is mounted for rotation about a longitudinal axis. The spindle comprises clamping means for clamping and releasing a tool. An energy accumulator is charged when the tool is not clamped and is at least partly discharged to tighten the clamping means when the tool is clamped. An actuating unit serves to charge the energy accumulator by means of an external force supplied via a connection. To enable employment of the spindle at very high speeds, the actuating unit and the connection are arranged in the rotating part of the spindle. The spindle rotates at at least 30,000 revolutions per minute and the connection is a releasable plug or screw connection.
Claims14
A spindle of a machine tool mounted for rotation about a longitudinal axis and comprising:
- drive means for driving a rotating part of said spindle at at least 30,000 revolutions per minute;
- clamping means for clamping and releasing a tool resp.;
- energy storing means assuming a first state of charge when said tool is not clamped and assuming a second state of charge resp. to tighten said clamping means when said tool is to be clamped;
- actuating means for effecting a change between said first and second state of charge of said energy storing means;
- releasable connection means for supplying an external force to said actuating means for effecting said change, said clamping means, said energy storing means, said actuating means and said connection means being all arranged in said rotating part of said spindle.
Dependencies are inferred from the claim text.