Canon iPF6100 Service Manual page 115

c) Pump unit
This printer uses tube pumps (suction pumps) that press on the ink tubes using rollers to produce negative
pressure, thus sucking ink.
Two rollers are used to press on a single tube one after another to control the amount of ink sucked.
The roller rotation timing is detected by the pump cam sensor, and the amount of rotation is controlled by the
driving of the purge motor.
Suction pump
Push rollers
To maintenance cartridge.
The ink from the sub cap flows to the absorbent
material under the purge unit.
Cap
Ink tubes
Purge motor
Cap
Pump unit
Pump encoder sensor
F-2-18
Chapter 2
Pump cam sensor
Sub cap
2-37