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Technology > Image Formation System > Various Types of Control > Developing
Technology > Image Formation System > Various Types of Control > Developing
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Twin-developing Method
Develop toner to the photosensitive drum using two developing cylinders
Reason of introuction
1) Inprovement of the development efficiency
Development efficiency with this ethod is btter than the development method with one
developing cylinder because development is performed twice consecutively.
2) High image quality
Prevent uneven density in a halftone image.
3) Reduction of toner consumption
Collect toner for which excessive development was perform.
Developing
assemvly
Photosensitive drum
Developing upper cylinder
Developing lower cylinder
Toner
Blade
Discrition
Toner that is supplied to the developing upper cylinder forms the toner layer on the blade and
is developed on the photosensitive drum.
After that, the image on the photosensitive drum is stabilized by the developing lower cylinder.
Following is the functions of the developing lower cylinder.
1) toner layer is formed by the blade and toner is developed to the photosensitive drum.
2) This modifies the toner image formed on the upper cylinder.Toner layer on the lower
cylinder is controlled by the upper cylinder and then, the image is developed on the
photosensitive drum.
3) If there is excessive toner on the upper cylinder, this collects the extra toner on the
photosensitive drum to stabilize the toner density.
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Related Service Mode
• Execution of toner install mode.
COPIER > FUNCTION > INSTALL > TONER-S
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Developing Bias Control
Charge the toner on the developing cylinder according to the potential on the photosensitive
drum, and form a toner image on the photosensitive drum.
Description
Apply the developing bias (AC, DC positive) generated at the developing high-voltage PCB
(PCB24) to the developing upper/lower cylinders.
• Developing DC bias :
Generate a potential difference with respect to the photosensitive drum. The bias value is
determined based on the result of potential control.
• Developing AC bias :
Improve an image quality.
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Dust-collecting Bias Control
Collect the toner floated on the photosensitive drum at the time of development.
Discrption
Apply the dust-collecting bias (DC negative) generated at the developing high-voltage PCB
(PCB24) to the dust-collecting roller.
Developing lower cylinder
Developing upper cylinder
Developing high-voltage PCB
(PCB24)
Dust collection roller
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Содержание imagePRESS 1110
Страница 242: ...3 3 Periodical Service Periodical Service Periodical service item ...
Страница 655: ...5 5 Adjustment Adjustment Overview When replacing parts Major adjustment ...
Страница 733: ...7 7 Error Code Error Code Overview Location Code Pickup Position Code Pickup size Error Code Jam Code Alarm Code ...
Страница 944: ...8 8 Service Mode Service Mode Overview COPIER FEEDER SORTER BOARD Situation Mode ...
Страница 1555: ... Service Tools General Circuit Diagram General Timing Chart Operator Maintenance Appendix ...