| 摘要 |
PROBLEM TO BE SOLVED: To make stable temperature of a surface of a heating roller near set temperature by gradually settling hunting of a temperature detection element when starting printing. SOLUTION: In a period when deflection in an up-and-down direction of the temperature detection element relative to control temperature when starting printing is equal to or more than a temperature control switching threshold set in advance for every set temperature, an output value of the temperature detection element is compared with the set temperature. When the output value of the temperature detection element is lower than the set temperature, a heater is energized for the time obtained by adding positive fixed printing initial correction time to basic energizing time; and when the output value of the temperature detection element is higher than the set temperature, the heater is energized for the time obtained by adding negative fixed printing initial correction time to the basic energizing time. After the deflection in the up-and-down direction of the temperature detection element is settled within the temperature control switching threshold, temperature control is switched to the one in accordance with a temperature difference between the output value of the temperature detection element and the set temperature of the surface of the heating roller or upward and downward tendencies of the output value of the temperature detection element. COPYRIGHT: (C)2009,JPO&INPIT
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