Method and apparatus for control of variability in charge to mas

Electrophotography – Control of electrophotography process – Control of developing

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399 46, 399 49, G03G 1500

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active

059872713

ABSTRACT:
An electrostatographic recording apparatus and method wherein a primary charger establishes a uniform electrostatic charge on an electrophotoconductive image recording member in accordance with a first operating parameter. A recording device imagewise modulates the charge on the image recording member to form electrostatic latent images in accordance with a second operating parameter and also forms a developable process control patch. A development station develops the electrostatic latent images and the control patch on the image recording member with toner in accordance with a third operating parameter. A replenishment device provides toner to the development station at a controlled rate in accordance with a replenishment signal. A sensor senses density of the control patch developed by the development station; and a controller is responsive to density of the control patch and provides adjustments to the first, second and third operating parameters and controls a reference signal used to generate the replenishment signal as a function of a parameter related to one of the first, second or third operating parameters. Preferably the controller controls the reference signal as a function of the parameter related to the first operating parameter, primary voltage setpoint.

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