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Step 4: Transfer
The visible images on the drum surface are transferred to copy
paper. Positive corona of the transfer charger is applied to the back of
the copy paper to transfer toner on the drum to the copy paper.
Step 5: Separation
Since the copy paper is positively charged and the drum is negatively
charged after transfer, an attraction force is generated between the
drum and the copy paper. Then an AC corona overlapped with nega-
tive DC is applied to the copy paper to decrease the copy paper
potential to the same level as the drum surface potential. Therefore
an attraction force between the drum and the copy paper disappears,
and the copy paper is separated by its own flexibility. If the paper is
not separated by the separation charger, it is forcibly separated by
the separation pawl.
Separation
pawl
Copy paper
Step 6: Cleaning
Residual toner on the drum is removed by the cleaning blade.
Residual toner
Toner
Paper guide
Copy paper
Transfer charger
output section
High voltage unit
Separation charger
output section
High voltage unit
Cleaner blade
Step 7: Discharge
The discharge lamp light is radiated to the drum to reduce the electric
resistance of the OPC layer, eliminating the residual charges.
Discharge lamp
(3) Potential transition of the DV unit section
Start
0
Toner
attachment
potential
(-V)
Drum
Toner attachment
D.S.P.
0V
DV.Bias
ON
Carrier attachment
D.S.P.
-550V
-550V
DV.Bias
OFF
Image area
D.S.P.
-70V
-70V
DV.Bias
ON
Non image area
D.S.P.
-550V
-550V
DV.Bias
ON
DSP: Drum surface potential
2 – 4
Print potential
Developing bias
Drum surface potential
Time
MG roller
Toner
0V
-400V
Carrier
0V
-400V
-400V
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