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AssigneeSMW-Autoblok Spannsysteme GmbH
InventorsEckhard Maurer, Jürgen Marquart
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With electrically operated clamping or gripping devices such as vices, it is necessary to switch them off after clamping the workpiece in order to prevent overheating. Machining by means of a machining robot, for example, is able to commence only once a safe torque off signal is present. However, the workpiece can become loose due to vibrations during such machining, since the de-energized electric motor can no longer perform retightening. This can lead to damage to the workpiece and, in the worst case, injuries to operating personnel. It is therefore the object of the invention to propose a solution for enabling retightening to be performed from an energy accumulator. This is achieved in that the drive shaft of the motor can be extended via a threaded spindle, thereby preloading the energy accumulator. This makes effective retightening of the clamping or gripping device possible, particularly when using a steep-threaded spindle.
A clamping or gripping device comprising:
A method for gripping or clamping a workpiece using an electric power clamp which actuates at least one clamping or gripping means by means of an electric motor comprising a drive shaft, force transmission means for connecting the drive shaft to the at least one clamping or gripping means, and an energy accumulator for preloading the at least one clamping or gripping means, wherein:
Dependencies are inferred from the claim text.