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Process/Operation > Fixing System > Controls > Fixing Arch Control
Process/Operation > Fixing System > Controls > Fixing Arch Control
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Fixing Arch Control
This machine executes fixing loop control to prevent image and feeding failures.
Fixing loop control is executed to prevent image and feeding failures by keeping the slack of
paper between the Secondary Transfer Outer Roller and Pressure Roller to a specified level.
Since the feeding speed of the Pressure Roller and that of the Secondary Transfer Outer
Roller are not completely the same when a sheet is fed to the Fixing Assembly, the following
problems occur.
When the feeding speed of the Pressure Roller is slower than that of the Secondary Transfer
Outer Roller, the slack of paper becomes larger, causing an image failure or paper wrinkle.
When the feeding speed of the Pressure Roller is faster than that of the Secondary Transfer
Outer Roller, the slack of paper becomes smaller, causing incorrect transfer of a toner image,
and an image expansion occurs.
The following figure shows the slack of paper.
Fixing Film
ITB
Pressure Roller
Sensor Flag
Secondary transfer outer roller
Loop Sensor
(PS22, PS23)
To prevent this symptom, two Arch Sensors located at the inlet of the Fixing Assembly detect
the slack of paper, and the DC Controller controls the rotation speed of the Fixing Motor. This
keeps an appropriate level of paper slack.
F-2-114
定着排紙上ローラ
定着排紙上ガイド
定着排紙上ガイドユニット
定着排紙下ローラ
定着フラッパ
定着排紙下ガイド
定着フィルムユニット
加圧ローラー
定着ヒーター
[
定着器
(High
モデル
)]
[
定着器
(Low
モデル
)]
Loop Sensor 1 Flag
for heavy paper
Loop Sensor 2 Flag
for papers other than
heavy paper
Loop Sensor 2
(PS23)
Loop Sensor 1
(PS22)
定着排紙上ガイドユニット
Fixing Motor
DC Controller
M17
Pressure Roller
Two Arch Sensors are explained below.
Arch Sensor 1 (PS22): Detects slack of paper when heavy paper is fed.
Arch Sensor 2 (PS23): Detects slack of paper when plain paper other than heavy paper is
fed.
F-2-115
