Automatic set-up for electrostatographic machines

Details Automatic set-up for electrostatographic machines Automatic set-up for electrostatographic machines

1991-04-01

1991-12-24

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355214, 355246, 355327, G03G 1500, G03G 1501

Patent

active

050757253

ABSTRACT:
An automatic set-up procedure uses a special set-up target document on the platen to compensate for changes in toning by adjusting process control parameters for neutrality and density. The target document has a neutral density step tablet which is imaged onto the recording member in the track of an on-line densitometer. Process control parameter adjustments are computed on-line based on deviations of measured densities from stored values corresponding to an aim print. Density aim values corresponding to a good print may need to be slightly different from machine to machine, and according to customer preferences. The aim values may have to be updated as the machine ages. Determination of the density aim values involves a manual calibration procedure, at the end of which, a new set of density aim values are stored for subsequent use in automatic set-up procedures.

REFERENCES:
patent: 4350435 (1982-09-01), Fiske et al.
patent: 4451137 (1984-05-01), Farley
patent: 4647184 (1987-03-01), Russell et al.
patent: 4853738 (1989-08-01), Rushing
patent: 4888636 (1989-12-01), Abe
patent: 4894685 (1990-01-01), Shoji
patent: 4949135 (1990-08-01), Ng

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