Abstract: A waiting time display system specifically for use in a copying machine includes a temperature sensor for monitoring the specific temperature of heat fixing rollers. Electronic processing is responsive to the varying signal outputs of the sensor and correspond to the rise of the temperature detected. A display panel is driven so that a plurality of lights are sequentially activated and deactivated to indicate time and temperature. An audio signal can also be provided to indicate the machine can be activated for copying. An operator can now gauge the amount of time until the copy machine is capable of being operative.

Abstract: A thermal fixing device which includes a heat roller which is positioned to contact a toner image-bearing surface of a copy sheet in order to completely fix the already preliminarily fixed toner image as the copy sheet moves through the thermal fixing device, the surface of the heat roller being made of RTV silicone rubber which contains 25 to 35% by weight of non-reactive dimethyl silicone oil having a viscosity of 10 to 300 centistoke and a trimethyl siloxy group as an end group. The heat roller contacts the toner image-bearing surface of the copy sheet with a total pressure of about 1.5 to 4.5Kg.