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Main Unit Theory of Operation 2nd Transfer Section
2-49
II Composition/Operation
9.2 Operation
9.2.1 2nd Transfer Roller pressure mechanism
• The machine is provided with a mechanism that presses the 2nd Transfer Roller up
against, and retracts it from, the Transfer Belt. This is done to prevent the 2nd Transfer
Roller from being dirtied due to patterns produced for purposes other than an actual
printing operation. Such patterns may be produced during the image stabilization
sequence or another function.
A. 2nd Transfer Roller pressure
• The 2nd Transfer Roller is pressed against the Transfer Belt to allow the toner image on
the Transfer Belt to be transferred onto the media.
• The 2nd Transfer Roller is pressed against the Transfer Belt to allow the roller to be
cleaned.
B. 2nd Transfer Roller retraction
• The 2nd Transfer Roller is retracted from the Transfer Belt when a detection pattern is
produced on the Transfer Belt for registration correction control, image stabilization con-
trol, or other control.
• The 2nd Transfer Roller is retracted from the Transfer Belt when the toner image on the
Transfer Belt cannot be transferred to the media due to a paper empty condition occur-
ring during printing.
• The 2nd Transfer Roller is retracted from the Transfer Belt after the 2nd transfer of the
last image is completed during a multi-print cycle.
C. Pressure/retraction operation
1. Rotation of the Intermediate Transport Motor (M3) is transmitted to the drive roller of
the Intermediate Transfer Belt Unit.
2. Rotation of the drive roller is transmitted to the Pressure/Retraction Clutch/2nd Image
Transfer.
3. When the Pressure/Retraction Clutch/2nd Image Transfer is energized, the rotation is
transmitted to the Pressure Cam via a coupling gear.
4. When the Pressure Cam turns a half turn to push up the Pressure Lever, the 2nd Trans-
fer Roller is pressed against the Transfer Belt.
5. At the same time, the AIDC Sensor Lever is pushed up to open the AIDC Sensor
Cover.
6. The light blocking plate fitted on the shaft of the Pressure Cam blocks the Retraction
Position Sensor/2nd Image Transfer (PC10) and a pressed position of the 2nd Transfer
Roller is detected.
7. When the Pressure/Retraction Clutch/2nd Image Transfer is energized a second time,
the Pressure Cam is turned another half turn. This releases the Pressure Lever, caus-
ing the 2nd Transfer Roller to be retracted from the Transfer Belt. At the same time, the
AIDC Sensor Lever is released, which closes the AIDC Sensor Cover.
8. The light blocking plate unblocks the Retraction Position Sensor/2nd Image Transfer
(PC10) and a retracted position of the 2nd Transfer Roller is detected.
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