Feeding Speed Control; Warp Control - Canon Color imageCLASS MF9170c Service Manual

Paper displacement
Paper displacement detection
sensor (SR714)
Fixing sub thermistor (TH2)
Throughput-down control
*1: For the universal-size paper or the paper of which width is smaller than A4-size, an interval between sheets is changed step by step according to the
temperature detected by the fixing sub thermistor.
*2: Although throughput-down control is not performed, a restriction is applied to the power supplied to the fixing heater.
Print speed when the throughput down control is executed
When the throughput down control is ON, print speed is switched step by step depending on the paper type or the temperature on the edge of the fixing sleeve etc.
Following shows the print speed list in case of the minimum throughput.
Plain paper/Recycled paper/Color paper *
Transparency
Postcard/Return postal card
*: Throughput down is executed in the same manner in case of plain paper H, thick paper 1, thick paper 2 and rough paper.

8.2.6 Feeding Speed Control

imageCLASS MF9170c / imageCLASS MF9150c
The machine switches the paper feeding speed depending on the type of paper fed in order to prevent a fixing failure.
The DC controller switches the paper feeding speed over 4 settings (1/1 speed, 4/5 speed, 1/2 speed, 2/5 speed) depending on the paper type specified by the main
controller.

8.2.7 Feeding Speed Control

imageCLASS MF8450c
The machine switches the paper feeding speed depending on the type of paper fed in order to prevent a fixing failure.
The DC controller switches the paper feeding speed over 3 settings (1/1 speed, 5/8 speed, 1/2 speed) depending on the paper type specified by the main controller.

8.2.8 Warp Control

imageCLASS MF9170c / imageCLASS MF9150c / imageCLASS MF8450c
To prevent an image failure, it is necessary to keep the paper warped at an appropriate level between the fixing assembly and the ETB.
When the paper transport speed of the pressure roller is slower than that of the ETB, the paper warp increases, and an image defect or paper crease occurs. Con-
versely, the speed is faster than that of the ETB, the paper is pulled by the pressure roller, and a color displacement occurs in the sub-scanning direction.
The machine controls the rotational speed of the fixing motor (M1), which drives the pressure roller, to keep an appropriate level of paper warp.
The paper is displaced
to the left side
No paper detection is performed
Lower than the
specified temperature
Instantly executed (the
lowest value)
Paper
Type
B5R/A5R/EXECR
Paper Grammage
Plain paper 60 to 105 g/m2
Thick paper 105 to 120 g/m2
Thick paper 121 to 176 g/m2
Postcard up to 190 g/m2
Rough paper -
Label -
Envelope -
Transparency -
Paper Grammage
Plain paper 60 to 105 g/m2
Thick paper 105 to 120 g/m2
Thick paper 121 to 176 g/m2
Postcard up to 190 g/m2
Rough paper -
Label -
Envelope -
Transparency -
T-8-4
The paper width is The paper is not
smaller *1 displaced
Paper detection is performed
Higher than the Lower than the
specified temperature specified temperature
No throughput-down
Executed step by step
control performed
T-8-5
Print speed (ppm)
Size 1st level 2nd level
16.1
- 3.6
- 10.1
T-8-6
Paper type Paper feeding speed
Plain paper
Thick paper 1
Thick paper 2
Postcard
Rough
Label
Envelope
Transparency
T-8-7
Paper type Paper feeding speed
Plain paper
Thick paper 1
Thick paper 2
Postcard
Rough
Label
Envelope
Transparency
The paper is displaced
to the right side
Higher than the
specified temperature
No throughput-down
control performed *2
3rd level Last level
4.4 3.4 2.76
2.4 - 1.8
3.8 3 2.5
1/1
4/5
4/5
1/2
2/5
4/5
4/5
2/5
1/1
1/1
1/1
5/8
1/2
1/1
1/1
1/2
Chapter 8
0019-5031
0020-9284
0019-5032
8-9