Electrophotography – Control of electrophotography process – Responsive to number of copies or passage of time
Patent
1996-04-01
1998-11-17
Royer, William J.
Electrophotography
Control of electrophotography process
Responsive to number of copies or passage of time
399 44, 399 46, 399 50, 399 62, G03G 1500
Patent
active
058390189
ABSTRACT:
The image forming apparatus of the invention controls the toner density by any one of the following configurations: by correcting the toner density of the developer in association with the agitation total; by controlling a process parameter so that the density of a toner patch formed on the photoreceptor corresponds to a prescribed density value and determining that developing performance of the developer is improved and canceling the toner density correction when the process parameter reaches the prescribed value; by changing the toner density reference value when the variation as to the charger output is equal to or greater than a first predetermined value and maintaining the changed toner density reference value until the variation of the charger output again becomes equal to or greater than the first predetermined value; or by prohibiting toner supply for a constant duration to prevent excessive toner supply if time from the end of the last operation of the developing unit to the start of a next operation, inclusive of the power-activation is equal to or longer the a predetermined period when the developing unit is activated to commence agitation of the developer.
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Asanuma Masato
Hatanaka Eisaku
Ino Toshiaki
Ishida Toshihisa
Itoyama Motoyuki
Royer William J.
Sharp Kabushiki Kaisha
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