Heat fixing device

Abstract

Abstract PURPOSE:To prevent the fall of temperature at a low temperature time to secure steadily the fixing temperature by driving each roll in the holding state and keep ing a pressuring roll warm by the heat of a heating roll. CONSTITUTION:A thermosensitive lead switch 13 is turned on under low-temperature conditions where the ambient temperature of a copying machine is 10 deg.C, and the temperature of a lower roll 11 is discriminated on a basis of the detected temperature of a temperature sensor 15, and driving of rolls is started if this temperature is lower than 70 deg.C. Since an upper roll 10 and the lower roll 11 are rotated in the approximately pressing state, a part of the heat of the upper roll 10 is taken away by the lower roll 11. The temperature of the lower roll is monitored by the temperature sensor 15 during this driving of rolls, and rolls are driven continuously until this temperature reaches 70 deg.C. Thus, the temperature of the lower roll 11 is raised periodically by interrupted roll driving even in the holding state to keep the lower roll 11 warm so that the temperature difference between the lower roll 11 and the upper roll 10 is reduced.

Inventors

• 👤 Akihiko Taniguchi
• 👤 明彦 谷口

Bibliographic Details