Ink System Mechanism - Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual

EPSON Stylus COLOR 680/777/77i

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
2-13.
PF Motor Pinion Gear (CW)
Combination Gear 16, 21.6 (CCW)
Spur Gear 15 (CCW) Combination Gear 37.6, 44.4 (CW)
Combination Gear 9.6, 24 (CW) Pump Unit Gear (CCW)
The Pump unit and Wiper mechanism drives according to the PF motor rotational
direction, as shown in the right table.
Operating Principles
Spur Gear 73.6 (CW)
Spur Gear 36.8 (CCW)
Capunit
Wiper
Pumpunit
CR lock lever
Figure 2-13. PF motor drive transmission path to the Pump unit
Overview
Table 2-4. PF motor rotational direction & Ink System Mechanism
Directions
• Sets the wiper.
Counterclockwise (*1) • Absorbs ink by the pump unit
• Set the CR lock lever
• Resets the wiper.
Clockwise (*1)
(*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 2-12. Pump mechanism
Spur Gear 15
Combination Gear 9.6, 24
Pump Unit Gear
Spur Gear 36.8
Revision B
Functions
Combination Gear
37.6, 44.4
38