TEMPERATURE MEASURING DEVICE
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
In xerographic copiers with roll fusers, it is necessary to measure the temperature of the roll to initially set the proper temperature. In most machines, this is done with temperature sensitive tape. This procedure is time consuming and subject to error. The temperature measuring device proposed here would be suitable for a soft roll fuser machine. Basically, the device is a built-in unit which consists of a temperature sensing resistor, a thermoplastic housing to support the resistor, and a mounting bracket that would lift the device off the roll when the machine is running. The resistor is attached to the housing by its bare leads so as not to impede the thermal response of the unit. With the roll stationary, the device is pivoted onto the roll and allowed to stabilize for approximately one minute. The resistance is converted to a voltage level by a suitable circuit. This voltage is fed through an A/D converter to the machine microprocessor which, in turn, converts this to a temperature reading that can be displayed on the console. The technical representative will either manually or through a subroutine adjust the setpoint to achieve the proper temperature.