Canon BJC 6000 Service Manual - Page 99

Pumping Operations, d Pump, e Maintenance jet splash guard

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BJC-6000 Part 4: Technical Reference d) Pump The pump is a tube pump type that applies the pressure of turning rollers to the ink tube to create negative pressure for sucking ink. Applying the pressure of two turning rollers alternately allows greater control over the amount of ink to be sucked, and helps to reduce the size of the pump unit. With two similar pumps set to turn in opposite directions, changing the rotational direction of the drive gear allows the individual BJ cartridges installed in the carriage to be cleaned separately. The amount of roller turning and the timing of turning are detected and controlled by the pump sensor. Carriage Color BJ Cartridge Cap Open Close Reverse Turning (Color BJ Cartridge) Pressure Rollers Pump Unit Air Valve Ink Tube Waste Ink Carriage Black / Photo BJ Cartridge Open Close Forward Turning (Black/Photo BJ Cartridge) Pressure Roller Air Valve Pump Unit Waste Ink Ink Tube Figure 4-21 Pumping Operations e) Maintenance jet splash guard The maintenance jet splash guard receives the maintenance jet ink (test discharge to maintain the nozzle) directly into the waste ink absorber through the hole by the side of the platen. 4-27

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d) Pump
The pump is a tube pump type that applies the pressure of turning rollers to the ink
tube to create negative pressure for sucking ink.
Applying the pressure of two
turning rollers alternately allows greater control over the amount of ink to be
sucked, and helps to reduce the size of the pump unit.
With two similar pumps set
to turn in opposite directions, changing the rotational direction of the drive gear
allows the individual BJ cartridges installed in the carriage to be cleaned separately.
The amount of roller turning and the timing of turning are detected and controlled
by the pump sensor.
e) Maintenance jet splash guard
The maintenance jet splash guard receives the maintenance jet ink (test discharge to
maintain the nozzle) directly into the waste ink absorber through the hole by the
side of the platen.
4-27
BJC-6000
Part 4: Technical Reference
Cap
Air Valve
Pressure Rollers
Ink Tube
Waste Ink
Pump Unit
Air Valve
Pressure Roller
Waste Ink
Forward Turning
(Black/Photo BJ Cartridge)
Ink Tube
Pump Unit
Open
Close
Open
Close
Reverse Turning
(Color BJ Cartridge)
Carriage
Color BJ Cartridge
Carriage
Black / Photo BJ Cartridge
Figure 4-21
Pumping Operations