| 摘要 |
PURPOSE:To obtain a safety device having high reliability by turning the electric power source of a microcomputer and peripheral electric power sources on and off independently according to the closing and opening of the cover of a housing. CONSTITUTION:When an external cover 32 is opened or closed, a knob 33 rotates a switch operating lever 41 in the direction of an arrow, thereby turning a safety switch 34 on and off. A switch 34-1 for a high voltage power source and a switch 34-2 for a low voltage power source are first turned on by the level difference (t) provided to the lever 41, then a detection switch 34-3 for a microcomputer is turned on. Conversely to turn the switch 34, the switch 34-3 is first turned off and the switches 34-1 34-2 are turned off with a delay by the level difference (t). The safety device having high reliability is thus obtained. |
