LOW WEAR FUSER ROLL TEMPERATURE SENSING DEVICE
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
It is desirable and even sometimes necessary to monitor or sense the temperature of the surface of a fuser roll in an electrostatographic printing machine. One way to sense the temperature is with a contact type temperature sensing device such as a thermister type device. The contact between the roll and the sensing device results in wear in the surface of the fuser roll which causes a degradation in copy quality forcing premature fuser roll replacement. The Figure illustrates a device which minimizes this wear problem by providing a silicone oil film between the fuser roll and the temperature sensing device to prevent buildup of abrasive wear causing material and produce improved contact point lubrication.. The thermister sensor 10 is urged against the fuser roll 12 by spring 14. A silicone oil supply such as wick reservoir 16 surrounds the sensor and has a permeable membrane 18 between it and the fuser roll surface which will allow a low rate of oil flow from the wick reservoir to the roll contact surface.