| 摘要 |
A power supply controlling apparatus for a printer is provided which includes a switching unit connecting and disconnecting a discharge path of current rectified by a first rectifier receiving power from an external alternating current (AC) power supply, a switching controlling unit controlling the connection and disconnection of the switching unit, and a second rectifier rectifying electric energy induced in the second winding to generate a voltage for operating the printer. Also provided are a first switch operating unit for outputting a first control signal to switch a power supply line on and off which is connected to the switching controlling unit based on the on/off state of the first switch, a second switch capable of connecting and separating the power supply line connected to the switching controlling unit, a system controlling unit for receiving the first control signal and determining the printing state to output a second control signal allowing the second switch to be switched on and off, and a second switch controlling unit receiving the first and second control signals to switch on and off the second switch. Thus, even though the first switch capable of controlling supply and interruption of power to and from the printer is forcibly switched off due to carelessness during printing, the supply of power required for completing a remaining printing operation is continued, thereby suppressing contamination of printer elements due to forcible interruption of operation.
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