| 摘要 |
<p>A system for controlling the tension of a wire for a wire-cut electric discharge machine, having a simple construction and capable of controlling the tension of a wire stably. A torque detecting means (101) is adapted to detect the load torque of a motor for taking up a wire (1) as the tension of the wire. A torque judgement means (102) is adapted to judge a torque, which is detected by the torque detecting means (101), as to whether it is within a predetermined range with respect to a target value. A wire-tension control means (103) is adapted to control, when the detected torque is not within a predetermined range with respect to a target value, the tension of the wire so that it is maintained at a set level, by increasing or decreasing an exciting current in a power clutch (5) provided in a wire feed region. Accordingly, the fluctuation of the tension of the wire due to the deterioration of power can be accommodated suitably, and the tension of the wire can be maintained at a constant level. It is also possible to control the tension of a wire by a simple method concerning software on the PMC side. This enables a stable control operation to be carried out.</p> |
