Operating Principles STYLUS 800 Service Manual
Table 2-4. Pump Mechanism Operation
PF Motor Rotational Direction Operation
1
Pumping
CW (forward rotation) Pseudo-pumping (False absorbing)
Gear
backrush
com~ensation
CCW
(backward rotation)
Pump pulley reset
Gear
backrush
compensation
The pump draws ink from the printhead nozzles and drains it into the waste ink drain tank. The
printer performs this operation to eliminate dust or bubbles within the nozzles. Figure 2-9
illustrates the pump operation. When the paper feed drive motor rotates
CW
(forward), the pulley
pumps in the wheel pump unit rotate in the direction of the arrow while squeezing the ink tube to
push the ink inside the tube out to the waste ink drain tank. On the other hand, when the motor
rotates
CCW,
the pulley pumps move inward along the grooves of the wheel pump so that pressure
applied to the ink tube is released.
Pumping (Pump motor:
Uflfouch
@+@
Cw)
No pumping (Pump motor: CCW)
Wheel Pump
/
Pulley Pump
Pumping (CW) No pumping (CCW)
f“’.,
(,
“L’
,...
~..
Figure 2-9. Pump Operation