Electrophotography – Diagnostics – Document handling
Reexamination Certificate
2006-02-15
2008-12-02
Royer, William J (Department: 2852)
Electrophotography
Diagnostics
Document handling
C399S033000, C399S069000, C399S329000
Reexamination Certificate
active
07460797
ABSTRACT:
A belt type fixing device includes a fix roller, a press roller rotatable in pressing contact with the fix roller, a heat roller accommodating a heat source therein and a belt passed over the fix roller and heat roller. A non-contact type temperature sensor is positioned in a sheet passing range corresponding to the width of a minimum sheet size and assigned to the heat roller while a contact type temperature sensor is positioned outside of the sheet passing range. A controller prevents the heat source from being turned on if a temperature sensed by the non-contact type temperature sensor is short of a preselected temperature B when a temperature sensed by the contact type temperature sensor reaches a preselected temperature A assigned to the non-contact type temperature sensor. A reflection type sheet sensor determines whether or not a sheet is present on the belt.
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Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Royer William J
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