249
SEP 2004
Ver. 1.2
DP-1520P/1820P/1820E
6.4.4.
Printing Process Operation
The Process Unit consists of Developer Unit, OPC Drum unit and Toner Bottle with Toner supplied. Toner is
supplied to the Process Unit.
The Process Unit includes the Toner Paddle and Mag Roller that supplies Toner to the OPC Drum.
The Cleaning Blade is attached to the OPC Unit. The Cleaning Blade scrapes the OPC Drum surface to
remove the excess toner on the surface of the OPC Drum into the Toner Waste Chamber. The removed
toner is moved into the Toner Waste Container by means of Toner Waste Paddle and Toner Waste Screw.
Developer Unit
1. Construction of the Developer
a. The developer unit consists of the Magnet Roller, Sleeve and Toner Screws.
b. The developer is mixed and charged by the Toner Screws where it is transferred to the developer
sleeve. The developer on the sleeve forms a brush by the magnetic force of the Magnetic Roller,
and makes contact with the electrostatic latent image on the drum. Toner is attracted to the areas of
the drum which have been discharged by the laser.
c. The Doctor Blade regulates the height of the magnetic brush which is formed by the developer
which is attracted to the sleeve of the Magnetic Roller.
d. The TDC sensor is an inductance type sensor used to measure the ratio of toner to developer.
e. A dust collector vacuum duct is provided over the developer unit to prevent toner dusting. The dust
collector is duct connected to the dust collector fan mounted on the machine frame which vacuums
the scattered toner to prevent toner dusting over the developer unit.
2.
Developing
a. The developer mixing unit contains developer which is a mixture of fine powder (non-magnetic
toner) and fine ferrite carrier.
Doctor Blade
OPC Drum
Recording Paper
Toner Bottle
Toner Waste Paddle
Toner Waste Screw
Cleaning Blade
Bias Charge Unit
Star Wheel
Magnet Roller
Toner Screw 1
Toner Screw 2
Process Unit
Содержание Workio DP-1520P
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