Ink Passage - Canon imageprograf ipf700 Service Manual

2.3.2 Ink Passage

2.3.2.1 Ink Passage
2.3.2.1.1 Overview of Ink Passage
The ink passage comprises ink tanks, a printhead, caps, a waste ink collector, ink tubes interconnecting the
mechanical components, and a suction pump that is driven to suck inks. It supplies, circulates, sucks and
otherwise handles inks.
The ink passage (per color) is schematically shown below, along with the ink flow.
Ink tank
Agitation plate
Sub buffer
a) Supplying inks from the ink tanks to the ink supply valve assembly
The ink tanks each contain an ink to feed the printhead.
Head differences allow the inks to flow from the ink tanks to the ink supply valves.
b) Inks flowing from the ink tanks into the subbuffer
As the inks flow from the ink tanks to the subbuffers due to head differences, air infiltrates the ink tanks through
air passages in the subbuffers to keep its internal pressure constant.
When the ink stored in a subbuffer exceeds a predetermined level, it flows into the absorber under the ink tank
through the air passage.
c) Supplying inks from the ink supply valves to the printhead
The ink stored in an ink tank flows to the printhead when the suction pipe is driven with the ink supply valve
opened and the head capped.
As an ink is sucked from the caps, it flows into the waste ink absorber under the maintenance cartridge or purge
Mechanical Drive Unit
Ink or air flow
Ink supply valve
Joint
Suction pump
Maintenance cartridge
F-2-5
Chapter 2
0013-6730
Carriage unit
Printhead
Cap
2-9