Epson 440 - Manual (Page 54)

EPSON Stylus Color 440/640/740 Revision A
Chapter 2 Operating Principles 54
The table below shows PF/Pump motor rotational direction and pump
system operation.
Table 2-7. Relationship between Pump Motor Rotation and it’s Work
Refer to Figure 1-13 in the right column which shows the pump
operations at clockwise and counterclockwise rotation.
In the ink absorptive operation such as cleaning, flushing and initial ink
charge except for printing operation, ink in the ink cartridge drains to the
waste ink absorber(pad) through the cap by the pump unit drive. In case
of printing and flashing drive, ink is popped out by the PZT in the print
head, but in case of absorptive operation such as cleaning and initial ink
charge, ink absorption is performed only by the pump drive without PZT
drive after the head surface is adhered to the cap. The next page
explains cap mechanism and relation between printer operation and
cap.
Figure 2-13. Pump Roller Rotation and it’s Operation
PF/Pump motor rotational direction Pump unit operation
Clockwise (CW)
forward rotation
1)Release from the Pump pressure welding
2)Head cleaner reset
3)Carriage lock reset
Counterclockwise (CCW)
backward rotation
1)Rotation towards pump pressure welding
2)Head cleaner set
3)Carriage lock set
Tube pressured Tube released
CW Rotation CCW Rotation