What Is Fusing?

Fixing is the process of placing the stopped light-sensitive material in the fixing solution and subjecting it to a fixed image after a certain chemical treatment. The photosensitive material that stopped development contains a large amount of silver halide that has not reacted during development, so it is still invisible. The silver halide that has not reacted during development must be removed by fixing before the development can form. The image is completely fixed. ^[1]

[dìng yng]

Fixing is the process of placing the stopped light-sensitive material in the fixing solution and subjecting it to a fixed image after a certain chemical treatment. The photosensitive material that stopped development contains a large amount of silver halide that has not reacted during development, so it is still invisible. The silver halide that has not reacted during development must be removed by fixing to make the formed The image is completely fixed. ^[1]

Fixing pressure roller

The pressure roller is a kind of sponge roller, which can ensure the amount of pressure between the fixing rollers. The paper is tightly pressed against the fixing roller by the spring pressure, thereby effectively fixing the toner on the paper.

Fusing output sensor

The paper eject sensor detects whether the leading edge or the trailing edge of the paper passes through the pressure roller and the heat roller. It also detects whether there is a paper jam in the fixing / ejection unit.

Fusing heat roller

The heat roller is heated by a heating and fixing lamp installed in the roller, thereby heating the paper, melting the toner on the paper, and the heat on the roller will fix the toner on the paper.

Fixing lamp

The fixing heating lamp is generally a halogen lamp, which is used for heating the fixing heat roller. The fixing lamp is fixed inside the heat roller and heats it. When the heat roller rotates, the fixing lamp does not rotate.

Fixing thermistor

The thermistor used in the fixing part of the copier is a thermistor with a negative temperature coefficient, and the resistance value of the resistance decreases as the temperature rises. The main board uses a thermistor to detect the temperature of the fuser heat roller and keep it within a specific temperature range. The temperature is between the lower limit of temperature that causes poor fixing and the upper limit of temperature that causes fixed ghosting. When the temperature of the fixing roller is lower than the preset temperature, the thermistor will turn on the power of the fixing lamp; when it is higher than the preset temperature, the thermistor will cut off the power of the fixing lamp.

Some machines have two thermistors in the fuser, one in the middle of the heat roller and one on the side.

The central thermistor is the main thermistor, which detects the temperature of the central part of the fuser roller and controls the on and off of the fuser lamp. With heat, the sides of the fuser roller may overheat. The sub-temperature thermistor detects abnormal heating in this area due to overheating of the fixing roller. Therefore, the sub-thermistor is not used for temperature control of the fixing roller, and only monitors the temperature of the fixing roller for abnormality.

Fixing and fixing thermostat

If the fixing roller becomes abnormally heated due to some problems (such as a thermistor failure), the fixing thermostat will automatically cut off the power to the fixing lamp. To prevent abnormal operations. If it is disconnected, it needs to be replaced, and at the same time, other parts that may have problems in the fixing unit are detected and replaced.