When the ink tank lever of the printer is pressed down, the hollow needle enters the air passage (covered with a rubber plug) and thus the internal pressure of the

ink tank is released, maintaining the internal pressure constant.

d) Notches for preventing incorrect insertion

The ink tanks have notches for preventing insertion. Wrong ink tanks cannot be installed in place due to these notches.

The ink tank lock lever can lowered to start ink supply only when the ink tank has been installed in place.

e) Agitation plate

The agitation plate assists the ink agitation which is performed to prevent precipitation of ink.

EEPROM

Notches for preventing

incorrect installation

f) Ink supply valve

The ink supply valve is located between the ink tank and ink tube to prevent ink leakage from occurring when the ink tube on the ink tank side is opened during

replacement of the ink tank.

The ink supply valve is opened and closed by the valve open/close mechanism which is driven by the valve motor.

The ink tank unit consists of two tank bases each of which contains ink tanks for three colors and the ink tubes for six colors.

The ink supply valve for each color is driven by the valve cam though a link. Ink supply valves for all colors are opened and closed at the same time.

2-8

Air passage

Ink port

Agitation plate

Ink tank

Notches for preventing

incorrect installation

Notches for preventing

incorrect installation

F-2-6

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