Canon BJC-3000 Service Manual page 94

Part 5: Appendix BJC-3000
c) Wiper unit
The wiper unit, controlled by the position of the carriage unit, performs wiping
operations.
When the carriage moves from left to right, the carriage moves the purge unit's wiper
flag, and while raising and setting the wiper, caps the cartridge.
When the carriage moves from right to left, the wiper wipes, after which the carriage
moves the wiper release unit to unlock the wiper latch and the wiper is lowered.
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