| 摘要 |
PROBLEM TO BE SOLVED: To save the waiting power by forming a self-holding circuit which turns on a switch for bypassing a non-lock type switch when the non-lock switch is turned on, and by providing an off timer means which turns off when the predetermined time has passed after the switch is turned on. SOLUTION: Under the condition that a power supply plug 2 is inserted to a receptacle of ordinary power source, when a non-lock switch 1 is depressed, a power source transformer becomes conductive and thereby the control circuit power source is applied to a single chip micro-computer 9. Consequently, with an output of the single chip microcomputer 9, a transistor TR5 becomes conductive and a drive coil L5 also becomes conductive to close a contact of a power source relay switch 5. Thereafter, even if conductivity of non-lock switch 1 is canceled, this switch self-holds with conductivity of the power source relay switch 5. An output of the single chip microcomputer 9 stops when the preset time of timer from the timer setting signal circuit 11 has passed and the power source relay switch 5 becomes off to cut the supply of commercial power source. |
