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Toner Feed Control for a High Speed Electrophotographic Printer

IP.com Disclosure Number: IPCOM000109815D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Hopper, SN: AUTHOR [+2]

Abstract

To maintain consistently good print quality in electrophotographic machines, toner deposit on the photoreceptor needs to be controlled at proper values. Disclosed herein is a way to control toner deposit by using an optical toner sensor, information from the printhead and an intelligent microcode algorithm to maintain optimum print quality in an electrophotographic printer.

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This is the abbreviated version, containing approximately 54% of the total text.

Toner Feed Control for a High Speed Electrophotographic Printer

       To maintain consistently good print quality in
electrophotographic machines, toner deposit on the photoreceptor
needs to be controlled at proper values.  Disclosed herein is a way
to control toner deposit by using an optical toner sensor,
information from the printhead and an intelligent microcode algorithm
to maintain optimum print quality in an electrophotographic printer.

      A representative electrophotographic engine is illustrated in
the figure.  The system consists of photoreceptor 1, photoreceptor
charging corona 2, printhead 3, toner developer with high voltage
biased magnetic transport roll 4, toner replenisher which adds toner
to the developer 5, optical toner sensor 6, transfer corona 7, and
cleaning station 8.  Also shown is the toner feed control algorithm 9
used in conjunction with information provided by optical toner sensor
6 and the printhead control electronics 10 to control the toner
replenisher.

      The control algorithm uses the following guidelines:
      1.  Only the algorithm can request that toner be fed.
      2.  Request for toner to be fed is answered each time with a
small, fixed amount of toner.
      3.  Toner is fed only when the required number of dots have
been printed by the printhead.
      4.  Optical toner sensor data is used in a formula matched for
the machine parameters to adjust the threshold the dot count must
meet...