Ink System Mechanism; Pump Unit & Wiper Mechanism - Epson Stylus Photo 895 Service Manual

EPSON Stylus PHOTO 895/785EPX

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 ASF motor. ASF motor drive is always transmitted to the
paper feeding mechanism and pump unit through the following gears. Refer to the
Figure 2-15. "ASF Motor Drive Transmission Path to the Pump Unit".
ASF Motor Pinion Gear (CW) Æ Combination Gear 14.4, 38.4 (CCW) Æ Combination
Gear 37.6, 44.4 (CW) Æ Spur Gear 36.8 (CCW) Æ Combination Gear 9.6, 24 (CW)Æ
Pump Unit Gear (CCW)
The Pump unit and Wiper mechanism drives according to the ASF motor rotational
direction, as shown in the right table.
Operating Principles
ASF
Motor
Cap unit
Pump unit
Wiper
CR Lock Lever
Figure 2-15. ASF Motor Drive Transmission Path to the Pump Unit
Overview
Table 2-6. ASF Motor
Directions
• Sets the wiper.
Counterclockwise (*1) • Absorbs ink by the pump unit
• Set the CR lock lever
Clockwise (*1) • Resets the wiper.
(*1): The ASF 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
Combination Gear
Combination Gear 9.6, 24
Combination Gear 14.4, 38.4
Pump Unit Gear
Spur Gear 36.8
Revision A
Direction & Ink System Mechanism
Functions
37.6, 44.4
ASF motor
41