| 摘要 |
PURPOSE:To make possible an over load condition of a power supply source to be detected easily, by an interruption of a printing against a driver circuit with a difference between a converted value in the loading time and a stored value in a memory is compared and operated and a warning signal is outputted when a prescribed value is exceeded. CONSTITUTION:A difference of a voltage stored in a memory 4 in the non-load time and the voltage during a printing is operated by a comparison operator 5, and whether a control limit is exceeded by the voltage difference is monitored thereby, and a warning signal is sent to a control section 6 when the control limit is exceeded. The printing is interrupted by the control section 6, when the warning signal is received by it. The warning signal 11 sent to the control section 6 is released by the operator 5 when the voltage difference becomes smaller than a preset value. The printing is started again when the release of the warning signal 11 is detected by the control section 6. Thereby, a substantial voltage drop can be measured by an extremely simple circuit. |
