Canon BJC 6000 Service Manual - Page 107

Operation of the Drive Switching Unit, Drive Switching Unit, Slide Arm

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BJC-6000 Part 4: Technical Reference d) Paper feed motor drive switching unit Depending on the carriage position, the drive switching unit switches the paper feed motor's drive power over to drive the purge unit or the auto-sheet feeder. The slide arm that travels in sync with the carriage action controls the operation of the selector flag. Slide Arm Flag Clamp Selector Flag Drive Input Gear ASF Drive Gear Figure 4-28 Drive Switching Unit Purge Drive Gear When the purge unit is driven, the flag clamp on the slide arm secures the selector flag. Turning the paper feed roller in the direction of paper feed transmits the driving power to the purge unit's drive gear without causing the ASF drive gear to turn. When the auto-sheet feeder is driven, the paper feed unit will be turned in the opposite direction of paper feed once to allow the flag to move toward the slide arm as the selector arm moves to the position where it supports the selector flag. With the selector flag supported, turning the paper feed unit in the direction of paper feed causes the ASF drive gear to start turning, and with it, pick-up operations commence. When the slide arm moves out of the position where it supports the flag, the ASF drive gear automatically stops turning when the pick-up action is complete. Slide Arm Selector Flag (when ASF is driven) Selector Flag (when purge is driven) Figure 4-29 Operation of the Drive Switching Unit 4-35

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d) Paper feed motor drive switching unit
Depending on the carriage position, the drive switching unit switches the paper feed
motor's drive power over to drive the purge unit or the auto-sheet feeder.
The slide
arm that travels in sync with the carriage action controls the operation of the
selector flag.
When the purge unit is driven, the flag clamp on the slide arm secures the selector
flag.
Turning the paper feed roller in the direction of paper feed transmits the
driving power to the purge unit's drive gear without causing the ASF drive gear to
turn.
When the auto-sheet feeder is driven, the paper feed unit will be turned in the
opposite direction of paper feed once to allow the flag to move toward the slide arm
as the selector arm moves to the position where it supports the selector flag.
With
the selector flag supported, turning the paper feed unit in the direction of paper feed
causes the ASF drive gear to start turning, and with it, pick-up operations
commence.
When the slide arm moves out of the position where it supports the flag,
the ASF drive gear automatically stops turning when the pick-up action is complete.
4-35
BJC-6000
Part 4: Technical Reference
Slide Arm
Selector Flag
(when purge is driven)
Selector Flag
(when ASF is driven)
Figure 4-29 Operation of the Drive Switching Unit
Slide Arm
Flag Clamp
Selector Flag
Drive Input Gear
Purge Drive Gear
ASF Drive Gear
Figure 4-28 Drive Switching Unit