Patent ID: 6860577

Claim:
A device for preventing a printer header from overheating, comprising: a control portion generating a heater driving control signal and a power control signal; a heater driving portion which is driven in response to the heater driving control signal; a header base plate including a heater emitting heat using electricity which is supplied by the heater driving portion; a base plate temperature detector detecting a temperature of the header base plate to output a detection voltage; a reference voltage generator generating a reference voltage; a comparator comparing the detection voltage detected by the base plate temperature detector with the reference voltage; and a power switching portion switching a driving voltage to be supplied to the heater in response to the power control signal and controlling the driving voltage in accordance with an output signal of the comparator, wherein the control portion controls the heater driving portion to generate a power control signal so as to control the power switching portion and the heater driving portion not to drive the heater in accordance with the detection voltage, and to control the power control portion not to supply the power voltage to the heater when the detection voltage is higher than a reference voltage regardless of the power control signal.