Konica Minolta bizhub C658 Service Manual page 1870

bizhub C658/C558/C458/C368/C308/C258
[1] Fusing loop sensor (PS2)
[3] 2nd transfer roller
[5] Registration sensor1 (PS1)
[7] Fusing unit
12.2 Operation
12.2.1 Registration control
• The transport motor and registration clutch controls rotation of the registration roller. Note that control in bizhub C658 models is provided by
the registration motor.
• The paper will create a loop between the tray 1 paper feed roller (or tray 2 vertical transport roller or bypass paper feed roller) and the
registration roller when the paper is being conveyed in order to correct the skew.
• Registration roller is controlled in order to synchronize the timing the unit starts writing the image and conveying paper.
• The amount of the loop of the paper can be adjusted in the [Service Mode] -> [Machine] ->
adjustment value will change the amount of loop in the paper.
(1) Operation
1. The paper is transported while the registration roller is stationary.
2. The registration sensor1 detects the leading edge of the paper, which is interpreted to mean that the paper has reached the registration
roller.
3. A paper loop is formed thus skew in the paper is corrected.
4. The registration roller rotates to transport the paper.
[5]
[4]
[1] Registration roller
[3] Manual bypass tray feed roller
[5] Registration sensor1 (PS1)
(2) Paper trailing edge detection (bizhub C658/C558)
• The registration sensor2 is provided to detect paper trailing edges.
• The registration sensor2 is a reflective optical sensor which detects paper using reflected light.
• The registration sensor1 (photosensor and actuator) is used to detect paper leading/trailing edges. However, paper detection accuracy
decreases when the speed of paper transport is increased. The registration sensor2 has been provided to resolve this issue.
• The registration sensor1 and registration sensor2 can be used in combination to increase the paper transport detection accuracy and
reduce the paper transport variability.
[4]
[3]
[1] Registration roller
[3] Registration sensor1
12.2.2 Right door mechanism
• The machine has the right door to enable easy access into the inside of the machine for clearing a paper misfeed or performing other
service jobs.
• The right door is mounted with the mechanisms of the vertical transport section, paper feed section (manual bypass tray), and the duplex
section. For detailed functions of the paper feed section (manual bypass tray) and the duplex section, see the corresponding chapters.
• The regist unit (2nd transfer section, registration section, and duplex section) is found inside the right door when opened.
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 12.
[1]
[2]
[3]
[1]
[2]
O-95
[2] Registration roller
[4] Registration sensor2 (PS72)
[6] Registration motor (M24)
- -
[Printer Reg. Loop
[2] Loop formation
[4] Tray 1 feed roller
- -
[2] Registration sensor2
[4] Registration sensor1 actuator
REGISTRATION SECTION
Adj.]. Changing the