Drum Unit; Composition; Mechanisms - Konica Minolta 7155 Service Manual

DRUM UNIT

[1] Composition

Developing unit
Drum
Cleaning/toner recycle section
Transfer and separation corona unit

[2] Mechanisms

Mechanism
PCL/TSL LED
Auxiliary separa- Separation claws
tion *1
Transport assis- Ratchet wheel
tance *2
The drum unit is an integral assembly consisting
of a drum, charging corona unit, developing unit,
cleaning/toner recycle unit, PCL, and separation
claws.
*1 Auxiliary separation
• To prevent paper jamming, three separation
claws are used to separate paper from the
drum forcibly. These separation claws are
pressed against the drum or detached from it
by turning ON/OFF the separation claw sole-
noid (SD1).
• To prevent a specific part of image-copied
paper from being stained and to prevent the
drum from being scratched, the swing mecha-
nism slides the separation claws about 8 mm
back and forth in parallel with the drum sur-
face.
Cleaning/toner recycle section
Charging
corona unit
Separation
claw SD (SD1)
Separation
claws
Toner guide roller (TGR)
PCL
Method
*2 Transport assistance
2-E-1
Charging corona unit
Drum
Developing unit
TSL
Separation claw SD (SD1)
Separation claws
The thick paper conveyance ability has been
improved by the use of ratchets.
DRUM UNIT