| 摘要 |
PROBLEM TO BE SOLVED: To use a thermo-mechanical machine immediately after turning on a switch and to prevent overheating and a heat shortage with a simple control circuit by supplying a prescribed large power to a heater for a prescribed short time whenever the switch is operated once and switching to a small power thereafter or when the switch is not operated. SOLUTION: Although the power whose voltage is dropped with a transformer 4 is supplied to a heater 2 which is wound around the iron tip 1 as a working part of a soldering iron from a commercial power source of 100 V by continuing to push an operational switch 3, the power of high voltage H is supplied during an initial time set with a timer T, the power of low voltage L is supplied by continuing to push the switch thereafter and the power is cut when the operational switch 3 is not operated. By continuing to push the operational switch 3, the power of 15 V is supplied to the heater 2 for initial two seconds set with the timer T, the temperature of the iron tip is raised up to nearly 100 deg.C, the power is switched to 8 V after two seconds, and the iron tip is nearly kept at that temperature. When the switch 3 is repeatedly operated after three seconds and after six seconds, the temperature of the iron tip becomes nearly 300 deg.C.
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