Capping Mechanism - Epson Stylus Photo 720 Service Manual

EPSON Stylus Photo 720 / EPSON Stylus Photo EX3

2.1.7 Capping Mechanism

The capping mechanism covers the printheads with the cap holder to prevent the ink
around the nozzles from increasing viscosity when the printer is in stand-by mode or
when the printer is off.
Capping mechanism moves up when the CR unit moves to the right end of the CR
guide shaft and covers the printhead nozzle plate.
Negative pressure
Closed state
Operating Principles
Stylus Photo 750 / Stylus Photo 1200
Flag for Carriage
Ink Eject Valve
Valve
Released state
The absorbing
power is low.
Flags for
Frame
Figure 2-10. Valveless Capping Mechanism
Stylus Photo 750 / Stylus Photo 1200 has built-in air valves in the capping unit but
Stylus Photo 720 / Stylus Photo EX3 uses valveless system.
Air valve function used for the previous models pumps and ejects ink only inside the
cap by sucking ink with the valve open. Valveless system is developed by changing the
ink sequence.
When sucking ink only inside the cap (false absorption), Stylus Photo 720 / Stylus
Photo EX3 moves printhead to the left from the cap unit (out of the cap) and drives
pump to perform false absorption.
Stylus Photo 720 and Stylus Photo EX3
Air valve is not assembled
in this portion.
Overview
Flag for Carriage
Ink Eject Valve
Negative pressure
Revision A
40