| 摘要 |
<p>The measuring is carried out either for the tool or the workpiece. When the machine tool is driven by an electric motor etc. its speed is reduced with increased load. The angular velocity of the rotary workpiece, or a rotary tool is compared in its actual value with a rated value. Thus the change of the angular velocity in time is measured as the differential quotient, which serves as a control magnitude. In the device for this measuring process a pulse generator rotate at the speed of the rotary part (workpiece or tool), which comprises pulse generator parts, uniformly distributed over the periphery of its rotation. The centre point of this periphery lies in the rotary axis of the respective part. A stationary pulse receiver is arranged in the effective range of the pulse generator parts, while a comparator circuit for the actual angular velocity of these parts compares the rated value.</p> |
