| 摘要 |
PURPOSE:To make easy and proper heating time settable by installing a device which controls current-energization to a motor timer with the on-off duty conformed to detection frequency. CONSTITUTION:It is provided with a motor timer 4 to be operated by a commercial AC power source 1, and heating time is controlled by this motor timer 4. And, there are provided with a device for detecting frequency of the commercial AC power source 1 and another device for controlling current-energization to the motor timer 4 with the on-off duty conformed to this detection frequency. That is to say, when the detection frequency is 50Hz, the on-off duty of a switch 11 is set to '1', and the switch 11 is left turned-on intact, but when it is 60Hz, the on-off duty of the switch 11 is set to '5/6', so that the switch 11 is subjected to on-off operations. With this constitution, timer graduations can get off with one kind irrespective of a difference in power frequencies, thus easy and proper heating time is made settable.
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