EPSON Stylus CX4100/CX4200/CX4700/CX4800/DX4200/DX4800/DX4850 Revision A
OPERATING PRINCIPLES Printer Mechanism 73
2.2.5.2 Pump Unit Mechanism
The PF Motor also controls the Pump Unit mechanism (including the Change Lever) as
well as the Paper loading/feeding mechanism. The drive of the PF Motor is always
transmitted to the Pump Unit. (And also, its drive is transmitted to the LD Roller
through the Clutch mechanism & the Change Lever.)
On this printer, the Pump Unit mechanism including the Change Lever plays a major
role expecting the ink eject operation. And, these operations control depending on the
PF Motor rotational direction as the following table below.
Note "*": The PF Motor rotational direction = seen from the left side of the printer.
1. Ink eject operation (usual operation)
The ink is absorbed from the Ink Cartridge, the ink cavity and is ejected to the
Waste Ink Pad from the Cap when the Ink Tube is pressed by a roller in the Pump
Unit.
Following figure shows you the overview of the Pump Unit mechanism operation.
Note : The PF Motor rotational direction = seen from the right side of the printer.
Figure 2-11. Pump mechanism
Figure 2-12. PF Motor drive transmission path to the Pump Unit
Table 2-5. PF Motor rotational direction & Ink system mechanism
Directions * Functions
Clockwise • Pump release
Counterclockwise
• Absorbs the ink
• Release the Change Lever from the Clutch mechanism
Cap Unit
side
Waste Ink
Pad side
Cap Unit
Pump Unit
Left side view
Right side view
Transmission Path: PF Motor pinion gear (CW) → Spur Gear 30.8 (CCW) → Spur Gear 32.4 (PF Roller) (CW) → Spur gear 13.5 (PF Roller) (CW) →
Combination Gear 21.24 (CCW) → Spur Gear 27.2 (Pump Unit gear) (CW)
(Above transmission pass = seen from the right side of the printer)
Spur Gear 30.8
PF Motor
pinion gear
Spur Gear 32.4
(PF Roller)
Spur Gear 27.2
(Pump Unit gear)
Spur Gear 13.5
(PF roller)
Combination
Gear 21.24
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