Control device for heat roller

摘要

Disclosed is a heat roller control device comprising a high temperature malfunction detection unit configured to receive a temperature value detected by a heat roller temperature sensor; an electrical power control unit configured to cut off, when receiving a high temperature malfunction detection signal, power feeding to a heat roller from an electrical power unit; an analog-to-digital converter configured to periodically convert plural of the temperature values from the heat roller temperature sensor to plural digital temperature values; a temperature value storage unit configured to receive and store the plural digital temperature values from the analog-to-digital converter; a temperature value processing unit configured to read and process the plural digital temperature values stored in the temperature value storage unit; and a high temperature malfunction determination unit configured to receive the processed data, and then based on the processed data, determine whether high temperature malfunction occurs.

主权项

1. A heat roller control device configured to control heating carried out with regard to a heat roller of an external fuser unit by controlling an external electrical power unit, comprising:
a high temperature malfunction detection unit configured to receive a temperature value detected by a heat roller temperature sensor, wherein, if the temperature value is greater than or equal to a predetermined high temperature threshold value, the high temperature malfunction detection unit generates a high temperature malfunction detection signal and sends the high temperature malfunction detection signal to an electrical power control unit and a temperature value processing unit; the electrical power control unit configured to cut off, when receiving the high temperature malfunction detection signal, power feeding to the heat roller from the electrical power unit so that the heating of the heat roller is stopped; an analog-to-digital converter configured to periodically convert plural of the temperature values from the heat roller temperature sensor to plural digital temperature values; a temperature value storage unit configured to receive and store the plural digital temperature values from the analog-to-digital converter; the temperature value processing unit configured to read from the temperature value storage unit, at the time when the high temperature malfunction detection signal is received, a digital temperature value corresponding to a specified detection time point generating the high temperature malfunction detection signal and one or more digital temperature values corresponding to a predetermined number of the detection time points backward from the specified detection time point, and processes the digital temperature values read to generate process data, and then send the processed data to a high temperature malfunction determination unit; and the high temperature malfunction determination unit configured to receive the processed data, and then based on the processed data, determine whether the high temperature malfunction has occurred, wherein, if it is determined that the high temperature malfunction has occurred, then the high temperature malfunction determination unit generates a high temperature malfunction code, and writes the high temperature malfunction code into a read-only memory unit.