Printing Process - Oki C810 Maintenance Manual

Oki Data CONFIDENTIAL

2.2 Printing process

The paper fed from Tray 1 or Tray 2 is carried by the paper feed roller, the registration roller L, and
the transport roller. When the paper is fed from the MPT, it is carried by the MPT paper feed roller
and the registration roller U. Then, an unfixed toner image is created on the paper transported
onto the belt sequentially through the electrophotographic process of KyMC. Thereafter, the
image is fixed under heat and pressure as the paper goes through the fuser unit. After the image
has been fixed, the paper is ejected to a face-up stacker or to a face-down stacker, according to
the outputting method selected by opening or closing of the face-up stacker.
While the above refers to the one-sided print operation of the printer, its operation in two-
sided print will be explained below.
When two-sided print is conducted, the paper that has passed through the fuser unit following
first one-sided print is sucked into the Duplex unit by the separator DUP . After entering the paper
reverse transport path, the paper is carried from there to the inside of the Duplex unit by the
inverting operation of the reverse roller. Then, after passed through the Duplex unit by the transport
roller that is located on the transport path inside the Duplex unit, the paper is fed along the paper
feed route of the Duplex unit to eventually merge the same route that comes from the tray. From
here on, the same operation as that of one-sided print of paper fed from the tray takes place.
Heat roller
Halogen lamp
Backup roller
Separator DUP
Reverse roller
Transport roller
Paper reverse transport path
44015503TH Rev. 1
MPT paper feed roller
Transport belt
Registration roller U
Registration roller L
Sub-roller
Paper feed roller
Paper feed roller
Sub-roller
(1) Paper fed from 1st Tray
1. As illustrated in Figure 2-1, when the solenoid is ON, the registration motor
rotates (counterclockwise), transporting the paper until the IN1 sensor comes
ON. (When the solenoid is ON, the paper feed roller is driven.)
2. After causing the IN1 sensor to come ON, the paper is further carried over a
certain distance to finally hit the registration roller L. (This corrects skew of the
paper.)
3. As shown in Figure 2-2, the solenoid is turned OFF, and the paper is carried by
the registration roller L. (When the solenoid is OFF, the registration roller L is
driven.)
WR sensor
Registration roller U
(drive)
Hopping gear Assy
Solenoid lever
(solenoid: ON)
Sub-roller
(drive)
Paper
Hopping roller (drive)
Figure 2-1
WR sensor
Registration roller U
(drive)
Solenoid lever
(solenoid: OFF)
Sub-roller
(stop)
Paper
Hopping roller (stop)
Figure 2-2
2. DESCRIPTION OF OPERATION
IN2 sensor
Registration roller L
(stop)
IN1 sensor
Registration motor
(counterclockwise)
IN2 sensor
Registration roller L
(drive)
IN1 sensor
Registration motor
(counterclockwise)
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