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Xerographic development system, method for determining when the developer material supply should be replenished

  • US 6,374,064 B1
  • Filed: 09/25/2000
  • Issued: 04/16/2002
  • Est. Priority Date: 09/25/2000
  • Status: Expired due to Term
First Claim
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1. In an electrostatographic printing system in which there is provided a primary supply of developer material, the developer material comprising toner and carrier, wherein the developer material in the primary supply is used for developing electrostatic latent images on a charge receptor, a secondary supply of developer material, and dispense means for conveying developer material from the secondary supply to the primary supply, a control method comprising the steps of:

  • monitoring a dispense rate of toner being used to develop electrostatic latent images, thereby determining a pixel dispense in substantially real time;

    monitoring a ratio of toner to carrier (T/C) in the primary supply, thereby determining a TIC dispense in substantially real time;

    developing a test patch with the developer material, the test patch being of a predetermined target reflectivity, and monitoring an actual reflectivity of the test patch, thereby determining a patch dispense in substantially real time; and

    controlling the dispense means according to an algorithm which takes into account the pixel dispense, the T/C dispense, and the patch dispense.

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