Hybrid scavengeless development using a failure mode detection s

Electrophotography – Diagnostics – Image forming component

Patent

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Details

399266, G03G 1500, G03G 1508

Patent

active

061481572

ABSTRACT:
An apparatus for developing a latent image recorded on a surface, including a housing defining a chamber storing a supply of developer material comprising toner; a toner donor member spaced from the surface and being adapted to transport toner to a region opposed from the surface; an electrode member spaced near the surface of a donor roll, said electrode member being electrically biased by a power supply to detach toner from said donor member as to form a toner cloud for developing the latent image; and a current signature analysis system, in communication with said power supply, for sampling an instant current signature being supplied to said electrode member; and a comparator, in communication with said current signature analysis system, for comparing said instant current signature to a plurality of preset fault signatures, said comparator including means for generating a message fault if the difference between said instant current signature to a plurality of preset fault signatures exceed a preset threshold value.

REFERENCES:
patent: 5134442 (1992-07-01), Folkins et al.

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