Canon BJC6500 - BJC 6500 Color Inkjet Printer, Service Manual, Page: 94 / 115

1.4 Transmission Gear Unit
Depending on the carriage position, the transmission gear unit switches the paper feed
motor's drive power over to drive the purge unit or the auto-sheet feeder. The slide arm
that moves with the carriage action controls the timing of the switching and the
operation.
ASF drive occurs when the slide arm depresses part A. When this occurs, the internal
rocker arm applies pressure to engage the ASF drive gears.
With the gears engaged, the ASF drive gears rotate, and ASF driving takes place. The
ASF gear is controlled by a single rotation clutch, as in the BJC-6100, and after
rotating one turn, rotation stops. With the single rotation clutch, when the carriage
depresses part A once, the pick up roller can be rotated, allowing paper feeding to occur
during printing. As a result, matching the phase of the ASF drive gear is necessary.
For details, refer to
Part 2: 2.4.5 How to adjust the ASF gear position (Page 2-14) .
Purge driving occurs when the slide arm flag secures the switching flag in the purge
drive position.
Part 5: REFERENCE BJC-6500
5-4
Slide Arm
Switching Flag
(purge drive)
Switching Flag
(ASF drive)
Part A
Slide Arm
Figure 5-5 Drive Switching Unit
Figure 5-6 Operation of the Drive Switching Unit