Ricoh FT5034, Service Manual

Page: 52 / 139

2. Cross Mixing
This copier uses a standard cross mixing
mechanism to keep the toner and developer
evenly mixed. It also helps agitate the
developer to prevent clumping and helps
create the triboelectric charge.
The developer on the turning development
roller is split into two parts by the doctor blade.
The part that stays on the development roller
forms the magnetic brush and develops the
latent image on the drum. The part that is
trimmed off by the doctor blade goes to the
backspill plate.
As the developer slides down the backspill
plate to the paddle roller, it is moved slightly
toward the rear of the unit by the mixing vanes.
Part of the developer falls into the auger inlet
and is transported to the front of the unit by the
mixing auger.
3. Drive Mechanism
The main motor turns the gears of the
development unit in the following order.
Development drive: A
→
B
→
C
→
D
Toner supply drive: E
→
F
→
G
→
H
The paddle roller knob has a one way clutch
inside. The one way clutch prevents the
development roller from turning in the opposite
direction, which would cause the developer
brush to damage the upper brush seal.
Mixing Vanes
Backspill Plate
Doctor Blade
Development
Roller
Auger
Paddle Roller
A: Development Drive Gear
B: Development Roller Gear
C: Idle Gear
D: Paddle Roller Gear
E
H
G
F
A
D
C
B
Spring Plate
Auger Gear
Paddle Roller
Knob
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