Capping Mechanism - Epson Stylus PHOTO 1270 Service Manual

EPSON Stylus Photo 870/1270

2.1.4.4 Capping Mechanism

The capping mechanism, which is driven by the pump unit, caps the
printhead closely to maintain air tightness inside the cap. This operation
is required to vacuum ink from the ink cartridges, printhead, and cap.
Also, to moisten the inside of the cap while the printer power is off, this
mechanism works to keep the cap and the printhead surface in a tight
contact. This function prevents ink from clogging while the printer is not
in use.
Negative
pressure is
released here.
Closed state
OPERATING PRINCIPLES
Previous Models
Ink Ejection
Hole
Valve
Released state
Figure 2-9. Valveless Capping Mechanism
The capping mechanism of this printer is a newly designed valveless
capping mechanism. So, unlike previous printers, it does not integrates
an air valve. The air valve is usually equipped to remove bubbles created
inside the cap by releasing the negative pressure. However, due to
change in the ink sequence, the new valveless capping mechanism
enables the printer to maintain the initial ink charge and cleaning effects
at the same level as before. Figure 2-9 outlines the valveless capping
mechanism.
Stylus Photo 870/1270
Ink Ejection
Hole
There is no air valve
assembled.
Overview
Revision B
42