Copystar Ri 2530, Service Manual

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2DF
2-1-15
(3) Single component developing system
This machine uses the single component developing system, and reversal processing is performed with a + charged
drum (a-Si) and a + charged magnetic toner.
With the single component developing system, toner is electrically charged by friction with the developing sleeve and +
charged when it passes through the magnetic doctor blade. The toner that has passed through the magnetic doctor
blade forms a uniform layer on the developing sleeve. When the toner layer comes to the location where the developing
sleeve is the nearest to the drum, toner moves between the drum and the developing sleeve by an electric field of the
magnetic pole. Then, when the developing sleeve rotates and passes through the nearest location to the drum, on the
portion of the drum that has been exposed to light, toner is attracted toward the drum by potential difference between the
developing bias and the drum surface and development is performed. On the other hand, on the portion of the drum that
has not been exposed to light, toner is attracted toward the sleeve and development is not performed. When toner
comes to an area where the gap between the drum and the developing sleeve is large, an electric field disappears and
toner does not leave the developing sleeve. Development is complete.
North pole
South pole
Developing sleeve
Drum
Magnetic toner blade
Toner
Figure 2-1-17-1 Single component developing system
2-1-14-1