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A liquid crystal temperature sensing element can be used to sense and control the temperature of a copier's hot roll fuser.
English (United States)
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Hot Roll Fuser Temperature Sensing Control
A liquid crystal temperature sensing element can be used to sense and
control the temperature of a copier's hot roll fuser.
Hot roll 10 cooperates with backup roll 11 to form a toner fusin nip 21. Roll
10 may comprise an aluminum cylinder covered by a thin rubber layer (not
shown). A heater 12 within roll 10 is energized in a manner to maintain the outer
surface of the metal cylinder at a setpoint temperature.
Actual temperature of this outer surface is sensed by liquid crystal member
13 whose bottom surface 14 rides against this moving surface.
As is known, the reflectance characteristic of member 13 changes with
temperature. This changeable characteristic is monitored by light emitting diode
15 and photocell 16. Diode 15 transmits light 17 to the surface of member 13.
The quantity of light 18 reflected back to photocell 16 is a measure of the hot
roll's surface temperature. This signal is supplied as a control input to
temperature control network 19, whose output 20 controls energization of heater
12, in either an on/off or a proportional manner.
In an alternative arrangement (not shown), one end of hot roll 10 is encircled
by a thin, 360 degree ring of such a liquid crystal temperature sensing element,
and a stationary light-emitting diode/photocell couple views the reflectance of the
exterior surface of such a ring, as a measure of hot roll temperature.
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