| 摘要 |
<p>PURPOSE:To prevent a generation of a short accident caused by a melting of an electric source cord by setting a current suppression means suppressing a current flowing in the electric source cord through discrimination of the electric source cord temperature rising to an abnormal range of temperature. CONSTITUTION:By using a temperature sensor 12 mounted on a cord reel, a temperature of an electric cord 9 is detected by a second temperature detecting circuit 23, and whether the detected temperature exceeds a temperature that is set by a temperature standard circuit 24 or not is discriminated by a second comparison device 25. If a temperature of the electric cord 9 rises abnormally and exceeds the set temperature, an output of the second comparison device 25 becomes L from H, and the electric cord has a decreased electric current quantity which flows in itself and a self heat generation is suppressed. Thereby, the short accident caused by melting of an outside skin of the electric source cord can be prevented.</p> |
