Browse Prior Art Database

Multiple Track Hot Roll Temperature Measurement

IP.com Disclosure Number: IPCOM000102440D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Olson, ST: AUTHOR

Abstract

Disclosed is a mechanism that translates the hot roll temperature sensing apparatus contained within the fuser of an electrophotographic printer.

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This is the abbreviated version, containing approximately 100% of the total text.

Multiple Track Hot Roll Temperature Measurement

       Disclosed is a mechanism that translates the hot roll
temperature sensing apparatus contained within the fuser of an
electrophotographic printer.

      Electrophotographic printers that utilize hot-roll-type fusers
often detect the hot roll's surface temperature using a
spring-biased, sliding-contact thermistor.  The thermistor is housed
within an elastomer pad, separated from the hot roll  surface  by a
thin layer of TEFLON* tape.  The tape is necessarily thin to allow
quick response by  the  thermistor to  changes in hot roll
temperature.  Continuous pressure by the thermistor on a
TEFLON-coated hot roll can  scratch  the surface of the hot roll
leading to print quality defects and premature failure.

      A  solenoid used to initiate separation of the hot roll from
the back-up roll during POR or jam  clearing  (see  the figure) was
further utilized to generate multiple thermistor to hot roll contact
tracks.  A cable attached to the back-up roll's  mounting hardware
increments a reversing lead screw. The  thermistor  bracket  is
attached  to  the  lead  screw follower.

      Distributing  the wear across a larger area reduces the
likelihood  of  hot  roll  scratches  and  premature   fuser failure.
*  Trademark of E. I. du Pont de Nemours & Co.