Chapter 7
7-5
7.1.5 Developing Block
0013-8466
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
In this block, the machine uses a toner projection method in which it deposits toner over the surface of the photosensitive drum, thus turning the static image into
a visible image. The developer used here is a 2-component developer, composed of non-magnetic toner and carrier.
F-7-6
Step 3: development
The drum unit consists of a photosensitive drum, developing cylinder, and a blade.
The developer is composed of toner (mainly of resin and dye) and carrier (iron powder) mixed in a specific ratio. The friction occurring between toner and carrier
causes the toner to become negatively charged and carrier to become positively charged.
The developer adheres to the surface of the developing cylinder by the work of a fixed magnet, and a blade is used to form a uniform layer of developer.
At this time, the areas of the photosensitive drum exposed by the laser beam will have a positive potential in relation to the developing cylinder.
As a result, the toner charged to a more or less identical potential as the developing cylinder will move to and stick to the areas of the photosensitive drum exposed
by the laser beam. This phenomenon is referred to as "toner projection," and is used to turn the image on the surface of the photosensitive drum into a visible image.
The "light area" of the photosensitive drum is charged to a negative potential; however, the diagram below shows it as being charged to a positive potential, indi-
cating that its potential is higher than that of the developing cylinder when the cylinder is used as the reference.
F-7-7
Developing cylinder
Toner feedscrew A
Blade
Carrier
Toner
Toner feedscrew B
Photosensitive drum
AC bias
DC bias
Developing cylinder surface potential
Drum surface potential (light area)
Drum surface potential (dark area)
+V
-V
0
Time (t)
Toner potential
P
otential (V)
Содержание iR C2880 series
Страница 1: ...Aug 29 2006 Service Manual iR C3380 2880 Series ...
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Страница 23: ...Chapter 1 Introduction ...
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Страница 53: ...Chapter 2 Installation ...
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Страница 127: ...Chapter 3 Basic Operation ...
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Страница 137: ...Chapter 4 Main Controller ...
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Страница 161: ...Chapter 5 Original Exposure System ...
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Страница 188: ...Chapter 5 5 24 F 5 68 4 Remove the original sensor 2 hook 1 F 5 69 ...
Страница 189: ...Chapter 6 Laser Exposure ...
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Страница 207: ...Chapter 7 Image Formation ...
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Страница 257: ...Chapter 8 Pickup Feeding System ...
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Страница 321: ...Chapter 10 Externals and Controls ...
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Страница 359: ...Chapter 11 MEAP ...
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Страница 401: ...Chapter 12 RDS ...
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Страница 411: ...Chapter 13 Maintenance and Inspection ...
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Страница 421: ...Chapter 14 Standards and Adjustments ...
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Страница 431: ...Chapter 15 Correcting Faulty Images ...
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Страница 459: ...Chapter 16 Self Diagnosis ...
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Страница 481: ...Chapter 17 Service Mode ...
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Страница 571: ...Chapter 18 Upgrading ...
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Страница 603: ...Chapter 19 Service Tools ...
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Страница 605: ...Contents Contents 19 1 Service Tools 19 1 19 1 1 Special Tools 19 1 19 1 2 Solvents and Oils 19 2 ...
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