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June 30, 1998
DRUM UNIT
Toner Recycling and Waste Toner Collection Mechanism
Toner Recycling
[C]
[K]
[L]
[D]
[E]
[J]
[B]
[D]
[E]
[F]
[A]
[G]
[I]
[H]
A229D630.WMF
A229D628.WMF
[F]
[G]
This machine has a toner recycling system, using a screw-pump unit. This
mechanism reduces the amount of waste toner by 90%.
Only toner which is transferred from the drum cleaning blade is recycled. Toner
collected from the transfer belt cleaning blade is not recycled, but is transported to
the toner collection bottle for waste toner through the toner collection tube [A].
The toner recycling unit is driven by the drum motor via timing belts, gears and the
toner recycling clutch [B].
The recycled toner from the drum collected by the cleaning coil [C] is dropped on
the screw [D] in the toner recycling unit, then transported to the screw-pump [E].
The screw-pump consists of the rotor [F] and the stator [G]. The rotor turns inside
the stator, and pushes the recycled toner through the screw-pump as shown. The
toner recycling motor [H] drives the air pump [I] This pump blows the toner out of
the screw-pump through the toner recycling tube [J] towards the development unit
[K].
The toner recycling sensor [L] monitors the rotation of the drive gear. If toner is
clogged and the coil cannot move when the motor is switched on, an SC495 is
generated.
2-61
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