Muratec MFX-2500 Field Engineering Manual page 47

2.4.9.1 Sleeve/Magnet Roller
This machine employs the MT-HG system with a Sleeve/Magnet Roller having the following magnetic
characteristics.
Turning of the sleeve surrounding the Magnet Roller ensures that fresh developer from the Developer
Mixing Chamber is always being conveyed to the point of development with respect to the PC Drum.
N1 : The point of development with the maximum magnetic flux density which ensures that the carrier
is firmly held onto the Sleeve Roller when toner is attracted to the latent image.
S1, N2 : The magnetic flux density between these two poles is made low to ensure that the developer
remaining on the surface of the Sleeve Roller is smoothly recycled. They also prevent developer
from scattering.
N3 : The developer brush is formed by this pole and its height is moderated before the brush is
regulated by the Doctor Blade.
S2a : This pole ensures that the developer is conveyed to the point of development over the wide
interval between N3 and N1.
S2b : If developer is compacted and clogs at the Doctor Blade and, as a result, part of the surface of
the Sleeve/Magnet Roller is not covered with developer, the nearby developer around this pole
with a weak magnetic force goes to those uncovered areas. This helps prevent white lines from
occurring on the copy.
S2b
S2a
N3
N1
S1
N2
PC Drum
Sleece/Magnet Roller
1st Toner Conveying Roller
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