Patent ID: 9561545
Date: 2017-02-07
CPC Classifications: B23B,Y10T

Claim:
1. A clamping device for machine tools, the clamping device being provided with a power-operated chuck for holding a workpiece and clamping jaws adapted to be actuated by means of a movement converter and an axially moveable draw rod, wherein the clamping device is provided with an electric drive motor, the electric drive motor being connectable to the movement converter for triggering clamping movements, wherein the electric drive motor is provided with a switching element which is adjustable by axial control between (i) a middle position in which the clamping device retains the clamping jaws in a clamped position around a workpiece so that the clamped workpiece can be machined, (ii) a first limit position for operating the power-operated chuck in a first operating condition, and (iii) a second limit position for operating an axially movable adjustment element in a second operating condition, wherein the adjustment element is connected to an auxiliary device of the machine tool, or is connected to the power-operated chuck for rotating the power-operated chuck in a position-oriented manner, and further wherein the switching element is adapted to be locked and unlocked on a machine spindle of the machine tool in one or both of the first and second limit positions.