Sleeve/Magnet Roller - Minolta Di350 Service Manual

FrameMaker Ver.5.5E(PC) Di350 GENERAL, MECHANICAL/ELECTRICAL
98.12.18
1171SBM1301A

13-1. Sleeve/Magnet Roller

• This copier 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 recy-
cled. 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
N2
S1
1171M027AA
M-26
PC Drum
Sleeve/
Magnet Roller
1st Toner Conveying Roller
1167M076AB