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The engagement of a copier's cleaning station brush to the photoconducto is dynamically controlled by monitoring copy-use parameters, such as the length of copy runs and the amount of toner used.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
84% of the total text.
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Cleaning Brush Control
The engagement of a copier's cleaning station brush to the photoconducto is
dynamically controlled by monitoring copy-use parameters, such as the length of
copy runs and the amount of toner used.
It is usual to compensate for cleaning brush wear by advancing or
incrementing the brush's rotational axis toward the photoconductor's drum
surface as a function of the number of revolutions of the photoconductor drum.
For example, for each N revolutions, the brush is incremented 0.004 inch toward
Since the brush rotates during cycle-up, copy run, and cycle-down of the
copier, and since brush wear is more nearly a function of the presence of toner
on the photoconductor during the copy run portion of its cycle, more brush wear
occurs from N drum revolutions of long copy request runs than when the same
number of drum revolutions occur due to short copy-request runs. Also, the type
of document which uses a lot of toner, for example, an all-black document,
represents more toner use per copy, and thus more brush wear during a drum
Therefore, more accurate compensation for brush wear occurs when brush
incrementing not only occurs as a function of photoconductor drum revolutions,
but also as a function of the type of copy-requests which have been experienced,
and the amount of toner which has been used. Toner use can be measured by
counting the number of times that virgin toner is fed to the developer station.