Air Purge Mechanism - Ricoh MP CW2201 Field Service Manual

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7. Detailed Description

Air Purge Mechanism

When an air sensor detects air in a sub tank, the air is not purged until the job ends. At the end of the

• The machine moves the carriage unit to the right and stops when the tank to be purged is aligned

with the air release solenoid.

• The correct position to stop is detected by monitoring the horizontal encoder strip behind the

carriage unit.

• When the carriage unit has positioned the print head tank [1] behind the air release solenoid [2],

the solenoid switches on and pushes the plunger [3].

• The plunger pushes in the purge valve [4] and the excess air is purged from the sub tank.

• After the air has been purged, the ink supply motor turns on to supply more ink to replace the

purged air with ink.

• As more ink flows into the tank, the actuator moves in direction of the red arrow toward the full

• After air has been purged, ink is pumped from the cartridge up to the sub tank, and then 0.6 cc of

ink is pumped out by reversing the ink pump.