| 摘要 |
<p>A brake control system for gravity shafts that controls the brakes of gravity shafts of a CNC machine tool. The stop of control for the gravity shafts is notified from CNC to PC (programmable controller) (S1). PC sends a signal to the machine side to operate the brake (S3). After a predetermined brake operation completion time has passed, CNC interrupts the exciting current from flowing to the servo motor (S7). The predetermined time is slightly longer than the time of from a moment at which CNC notified the stop of control of the servo motor to a moment at which the brake locks the gravity shaft. This makes it possible to prevent the gravity shafts from falling or to prevent any shock upon the gravity shafts.</p> |
