Ink System Mechanism; Pump Unit & Wiper Mechanism - Epson Stylus C40UX Service Manual

Stylus C40UX/C40SX/C20UX/C20SX

2.1.6 Ink System Mechanism

Ink system mechanism consists of pump unit (include the CR lock lever) and capping
mechanism. Ink system mechanism drives the pump unit that presses cap to the
printhead and ejects ink from ink cartridge, head cavity and cap to the waste ink pad.
2.1.6.1 Pump Unit & Wiper mechanism
The pump unit is driven by PF motor. PF motor drive is always transmitted to the paper
feeding mechanism and pump unit through the following gears. Refer to the Figure
2-15.
PF Motor Pinion Gear (CCW) Spur Gear 60 (PF Roller)(CW)
Combination Gear 18, 28 (CCW) Spur Gear 27.2 (CW)(Pump unit)
Operating Principles
Spur Gear 10.8(CW)
Pump unit
Cap unit
Figure 2-15. PF motor drive transmission path to the Pump unit
Overview
Table 2-4. PF motor rotational direction & Ink System Mechanism
Directions
• Absorbs ink by the pump unit
Counterclockwise (*1)
• Set the CR lock lever
(*1): The PF Motor rotational direction = seen from the right side of the printer.
Following figure shows the overview of the pump mechanism operation.
Figure 2-14. Pump mechanism
Spur Gear 10. 8
Combination Gear 18, 28
Revision B
Functions
Pump unit
Spur Gear 27. 2
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