EPSON Stylus C110/C120/D120 Revision B
OPERATING PRINCIPLE Printer Mechanism Operating Principles 33
2.2.4.4 Pump Unit Mechanism
The PF motor drives the pump unit mechanism as well as the paper loading/feed
mechanisms. The motor drive force is always transmitted to the pump unit. (It is also
transmitted to the LD roller via the clutch mechanism and the change lever.)
The rotational direction of the PF motor changes the pump unit operations as shown in
the following table.
Note " * " : The rotational direction as seen from the right side of the printer.
Ink drawing operation
The pump unit draws ink out of the ink cartridges and ink cavity, and sends it to
the waste ink pad by means of a pressure to the ink tube applied by the pump unit
roller.
The following figure illustrates an overview of the pump unit mechanism operation.
Note : The PF motor rotational direction is as seen from the right side of the printer.
Figure 2-17. Pump Mechanism
Figure 2-18. PF Motor Drive Transmission to Pump Unit
Table 2-4. PF Motor Rotational Direction & Pump Unit Operation
Rotational Direction* Function
Clockwise • Releases the pump
Counterclockwise • Draws (suctions) ink
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