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d) Pump
This is a tube pump system consisting of two ink tubes (one for black and one for
color) pressurized by a rotating roller. A negative pressure is thereby created to suck
the ink. Inside, there is a valve dedicated to black ink and one dedicated to color ink.
When the valves close or open separately or simultaneously, only the black ink (color
valve open) or color ink (black valve open) can be sucked or both inks can be sucked
(black and color valves closed).
The amount of ink sucked can be high, medium, or low depending on how much the
roller rotates.
The pumping operation is executed with the rotation of the roller after the carriage is
released from the capping position and both valves are opened.
The degree of rotation of the pump's roller and the timing of the rotation are
controlled by the step count in accordance with the initial position detected by the
pump sensor.
The two tubes are placed right before the waste-ink absorber. By mixing pigment ink
and dye ink, ink hardening is prevented.
Part 3: Technical Reference
S600
3-16
Rotation Direction for
Wire/Capping
Rotation Direction for
Ink Suction
To Waste-Ink
Absorber
Valve
Closed
Black Ink Tube
Color Ink Tube
Rotating Roller (inside)
Valve Open
Figure 3-10 Pump Operation