| 摘要 |
PURPOSE:To enable safe control of operation by detecting the load or abnormality that acts on a sliding table by means of difference signals between the output of the rotation angle detector of a sliding-table driving rotary shaft and the output of a linear position detector. CONSTITUTION:A sliding table 1 is reciprocated by means of the rotation of a feed screw 3 driven by a motor 6, and its quantity of travel is detected by means of a linear position detector 12 which counts the slit of a linear scale by means of a sensor 8, while the rotary angle of the motor 6 is detected by means of a rotary angle detector 13 consisting of a pulse generator, etc., with both detected data being inputted into an abnormality monitoring device 14. This abnormality monitoring device 14 obtains the difference between a rotary angle caused by the travel of the sliding table 1 from its reference position to the existing position and the quantity of the travel and, from this quantity of deviation, it detects the reaction force and abnormal load acting on the sliding table 1 and abnormality in driving system, securely and rapidly. Thereby, the control of operation of a machine tool can be safely performed while the machining condition and maintenance can be improved by always monitoring the operating condition of the sliding table. |
