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High Efficiency Cleaner for High Speed Electrophotographic Printers

IP.com Disclosure Number: IPCOM000110003D
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 4 page(s) / 125K

Publishing Venue

IBM

Related People

Baird, B: AUTHOR [+9]

Abstract

Disclosed is an improved cleaning scheme for electrophotographic printers by applying a high voltage to a nozzle that engages the cleaner brush.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

High Efficiency Cleaner for High Speed Electrophotographic Printers

       Disclosed is an improved cleaning scheme for
electrophotographic printers by applying a high voltage to a nozzle
that engages the cleaner brush.

      Fig. 1 shows a typical electrophotographic printer.  The
printing process starts with a clean photoconductor 10 usually in the
form of a drum or belt.  Charge corona 1 charges the photoconductor
to a predetermined voltage level with polarity that depends on the
electrical characteristics of the photoconductor.  The incoming data
to be printed is then fed to the electrical drive of printhead 2,
which will discharge the photoconductor accordingly and leave on the
photoconductor a latent electrostatic image that represents the
incoming data.  The latent image will be developed to a visible image
by development station 3 by depositing toner in areas representing
the incoming data.  In most cases, a pre-transfer exposure lamp 4
discharges the electrostatic latent image to make it easier for toner
to transfer to the paper.  At transfer station 5, paper line 12 is
brought into intimate contact with the photoconductor, and the
transfer corona deposits a charge on the paper of opposite polarity
to the toner.  Residual toner left on the photoconductor will be
removed from the photoconductor by cleaning station 6 for the
photoconductor to start another printing cycle.

      At high printing speed and high print optical density, the
removal of residual toner from the photoconductor is usually
difficult to accomplish without impacting the photoconductor life
and/or the cleaner brush life.  Increasing the brush RPM and brush
engagement to increase the cleaning efficiency will result in
excessive photoconductor wear or formation of fused-on toner (FOT).
Trying to remove the toner from the cleaner brush using a vacuum
nozzle or a beater bar at high brush RPM results in excessive brush
wear.

      To accomplish efficient cleaning at high printing speed and
high print optical density without affecting the photoconductor life
and the brush life, it is necessary to emphasize electrostatic forces
and reduce the level of mechanical forces in the cleaning process.
Electrostatic forces are enhance...