Epson Stylus Photo 925 - Pump Unit & Wiper Mechanism; Ink System Mechanism

EPSON Stylus Photo 925 Revision A
Operating Principles Overview 38
2.1.7 Ink System Mechanism
Ink system mechanism consists of pump unit (include the CR lock lever) and capping
mechanism.The capping mechanism is placed in close contact with the print head and
the Pump Unit suck ink out from the ink cartridge into the ink cavities in the head and
cap and then into the waste ink pad.
2.1.7.1 Pump Unit & Wiper mechanism
The pump unit is driven by ASF/Pump motor. ASF/Pump motor drive is always
transmitted to the paper feeding mechanism and pump unit through the following
gears. Refer to the Figure 2-13, "ASF/Pump Motor Drive Transmission Path to the
Pump Unit".
ASF/Pump Motor Pinion Gear→Combination Gear 14.4, 38.4
→Combination Gear 37.6, 44.4→Spur Gear 36.8→
Combination Gear 9.6, 24→Spur Gear 27.2 (Pump Gear)
The Pump unit and Wiper mechanism drives according to the ASF/Pump motor
rotational direction, as shown in the right table.
Following figure shows the overview of the pump mechanism operation
Figure 2-12. Pump Mechanism
Figure 2-13. ASF/Pump Motor Drive Transmission Path to the Pump Unit
Table 2-8.ASF/Pump Motor Rotational Direction & Ink System Mechanism
Directions
(*1)
*1. The ASF/Pump Motor rotational direction = seen from the right side of
the printer.
Functions
Counterclockwise • Sets the wiper.
• Absorbs ink by the pump unit
• Set the CR lock lever
Clockwise • Resets the wiper.
To Waste Drain
Ink Pads
Toward Cap Unit
Combination Gear 14.4, 38.4
Combination Gear 37.6, 44.4
Combination Gear
Spur Gear 36.8
Spur Gear 27.2 (Pump Gear)
Cap unit
Pump unit
CR Lock Lever
Wiper
ASF/Pump Motor
Pinion Gear
ASF/Pump Motor