Browse Prior Art Database

Improved Developer Roller End Seal Design

IP.com Disclosure Number: IPCOM000119977D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Baker, RW: AUTHOR

Abstract

Disclosed is an improved developer roller end seal design for use in a monocomponent, nonmagnetic, contact development electrophotographic printer. One of the major end seal problems is leakage of the nonmagnetic toner past the seals; this toner then contaminates the inside of the printer and can be deposited on the printed page. The improved design creates an electrostatic field in the seal gap which prevents the leakage when the printer is operating.

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Improved Developer Roller End Seal Design

      Disclosed is an improved developer roller end seal design
for use in a monocomponent, nonmagnetic, contact development
electrophotographic printer.  One of the major end seal problems is
leakage of the nonmagnetic toner past the seals; this toner then
contaminates the inside of the printer and can be deposited on the
printed page.  The improved design creates an electrostatic field in
the seal gap which prevents the leakage when the printer is
operating.

      The figure shows a sectional view of the critical developer
components in the IBM 4019 LaserPrinter.  The developer roller 1
consists of a nitrile rubber core molded around a steel shaft onto
which a thin polyurethane coating is applied either by spraying or
dipping.  A metal doctor blade 2 is spring-loaded against the
developer roller and meters the toner into a thin, uniform layer.
The toner adder roller 3 is an electrically conductive foam which
delivers toner to the developer roller and is instrumental in the
triboelectric charging of the toner.  The end seal 4 is an
elastomeric lip seal which is intended to prevent toner leakage past
the stationary doctor blade and the rotating developer roller.  The
developer roller shaft, toner adder roller shaft, and doctor blade
have distinct electrical voltages applied to them to aid in charging
the toner and to control the development process.

      The concept of this invention is to make the elastomeric
material o...