Specifications

EPL-5700 Chapter2 Operating Principles
Rev. A
2-
9
2.1.7 Developing
2.1.7.1 Overview
Toner image is created by giving toner to the electrostatic image on the
OPC drum.
OPC Drum
Toner Hopper
Sleeve Roller
Toner Blade
Resin Sleeve
Toner Agitation Wing
Toner sending Roller
Bias Seal
Figure 2-10. Developing Mechanism
Developing Bias Terminal
Toner Blade Bias Terminal
Bottom Seal Bias Terminal
Figure 2-11. Bias Terminals
2.1.7.2 Function of each parts in the development part
Table below shows each parts with its function.
Table 2-1. Parts of Developing Mechanism
Name Function
Toner Hopper Toner is in.
Toner agitation
wing
It agitates toner hopper inside, and sends toner to
the roller part.
Toner sending
roller
Transfers toner to the sleeve roller part.
Sleeve roller Rotates resin sleeve.
Resin sleeve Transfers toner to the OPC drum surface.
OPC drum Creates image on the surface by laser beam.
Performs development by resin sleeve, and
transports the developed image to the paper
surface.
Toner blade Put the toner thin and evenly on the resin sleeve.
Charges toner minus between toner blade and
resin sleeve.
Bias seal Collects toner which does not attach to the OPC
drum.
The developing bias changes voltage as follows, in order to enable the
printer to adjust printing tones.
Table 2-2. Tone Adjustment by Developing Bias Changes
+100V
Developing Off (Reversed bias)
1
−240V
Light
2
−260V
3
−280V ↑
4
−300V
Initial Value
5
−313V ↓
6
−326V
7
−339V
Dark
Note) During the print start or cleaning, reversed bias is charged in order to
prevent the toner of developing part from moving to the OPC drum.