Temperature control method of heat fixing device

Abstract

Abstract PURPOSE:To decrease the rise time and to avoid overshoot, by having a rise with ON/OFF control when the temperature of the heat fixing device is higher than a fixed level. CONSTITUTION:When the heater temperature is lower than a fixed level, the ON/OFF control signal (c) is set at L. At the same time, a phase control signal (b) having large width is generated from a phase signal generating circuit A2 since a large output is generated from an amplifying circuit A1. The signal (b) is applied to a triac TR and gives phase control to the electric power of a heater H. When the heater temperature reaches a fixed level, a heater power supply is turned off. Thus the signal (c) is set at H to consecutively turn on the triac TR. As a result, the heater temperature rises quickly up to a set level. Then the output of a detecting circuit A6 is set at L. Thus the output (c) is set at L again, and the TR undergoes phase control again with the output (b). Therefore the heater temperature is kept at a set level.

Inventors

• 👤 Masaaki Ogura
• 👤 正明 小椋

Bibliographic Details