Dynamic duty cycle for increased latitude

Details Dynamic duty cycle for increased latitude Dynamic duty cycle for increased latitude

2001-04-26

2002-09-03

Chen, Sophia S. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S055000

Reexamination Certificate

active

06445889

ABSTRACT:

BACKGROUND AND SUMMARY
Cross reference is made to the following applications filed concurrently herewith: U.S. application Ser. No. 09/843,841 entitled “Edge Enhancement Scavenging Devices” and U.S. application Ser. No. 09/843,552 entitled “TC Runtime Control Using Underdeveloped Solid”.
This invention relates generally to a hybrid jumping developer system, and more particularly concerns a method for employing a dynamic duty cycle to increase development latitude.
In a typical electrophotographic printing process, a photoconductive member is charged to a substantially uniform potential so as to sensitize the surface thereof. The charged portion of the photoconductive member is exposed to a light image of an original document being reproduced. Exposure of the charged photoconductive member selectively dissipates the charges thereon in the irradiated areas. This records an electrostatic latent image on the photoconductive member corresponding to the informational areas contained within the original document. After the electrostatic latent image is recorded on the photoconductive member, the latent image is developed by bringing a developer material into contact therewith. Generally, the developer material comprises toner particles adhering triboelectrically to carrier granules. The toner particles are attracted from the carrier granules to the latent image forming a toner powder image on the photoconductive member. The toner powder image is then transferred from the photoconductive member to a copy sheet. The toner particles are heated to permanently affix the powder image to the copy sheet. After each transfer process, the toner remaining on the photoconductor is cleaned by a cleaning device.
In a machine of the foregoing type, utilizing a hybrid jumping development (HJD) system, the development roll, better known as the donor roll, is powered by two development fields (potentials across an air gap). The first field is the ac jumping field which is used for toner cloud generation and has a typical potential of 2.25 k volts peak to peak at 3.25 kHz frequency. The second field is the dc development field which is used to control the amount of developed toner mass on the photoreceptor.
SUMMARY OF THE INVENTION
There is provided an electrostatographic development system wherein toner is conveyed from a donor member over a development gap to a charge receptor by a development field in the development gap, a method comprising the step of: monitoring at least a first parameter of the system to detect an arcing condition within the development gap; and if an arcing condition is detected, tuning a duty cycle to avoid the arcing condition.


REFERENCES:
patent: 6148157 (2000-11-01), Wayman
patent: 6266494 (2001-07-01), Budnik et al.
patent: 6285837 (2001-09-01), Budnik et al.

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