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Nip Width
The fixing pressure roller presses the fixing roller by coil springs on the
left and right. The area where the fixing press roller presses the fixing
roller is called the "nip," and the width of this nip section is called the "nip
width." The nip width is stipulated, and sometimes is the cause of faulty
fixing or skewing of the recording paper when it is outside the stipulated
range.
• Drum cleaning step
After toner transfer, an extremely slight amount of toner remains on the
photosensitive drum without being transferred to the recording paper. For
this reason, the toner remaining on the photosensitive drum is removed, in
this step. This step involves rotating the photosensitive drum, and scraping
off the remaining toner from the photosensitive drum to clean the surface
of the drum. After being scraped off the photosensitive drum, the toner is
collected in the waste toner container inside the cartridge.
Cleaner blade
Waste toner
container
Waste toner
Fig. 4-55 Drum Cleaning
RECORDING SECTION
Photosensitive
drum
4–45
1
2
3
4
5
6
ït
çi
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