Various Control Mechanisms; Controlling The Speed Of The Fixing Film; Controlling The Fixing Film Speed In Response To Low Temperature; Controlling The Fixing Film Speed - Canon iR4570 Series Service Manual

Chapter 9

9.3 Various Control Mechanisms

9.3.1 Controlling the Speed of the Fixing Film

9.3.1.1 Controlling the Fixing Film Speed in Response to Low Temperature

iR2270 / iR2870 / iR3570 / iR4570
As in the morning, driving the fixing film in a low-temperature environment without warm-up could cause the film
to become displaced. In consideration of this fact, the fixing motor is started up in phases (1/4 speed to 1/2 speed and
then to normal speed).

9.3.1.2 Controlling the Fixing Film Speed

iR2270 / iR2870 / iR3570 / iR4570
The rotation cycle of the fixing film is monitored to control the fixing motor to a specific speed.
When the fixing film rotates and, as a result, the reflecting member positioned in the loop of the film approaches the
speed sensor, the machine detects the rotation of the fixing film.
[1]Speed sensor
[2]Reflecting member
[3]Fixing film (driven by fixing motor)
[4]Pressure roller
[A]Paper feed direction
[B]Speed sensor output
[C]1 rotation of fixing film
Timing of Control
The speed of fixing film rotation is monitored at all times after the fixing motor goes on and its speed reaches a
specific value. The speed of the fixing motor is then controlled so that it remains at a specific level at all times.
9-4
[1] [2]
[3]
[4]
[B]
[C]
F-9-2
[A]
0006-6037
0007-5124
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