EPSON Stylus PHOTO 810/820/830

Revision B

2.1.5 Ink System Mechanism

The Ink system mechanism consists of Pump mechanism with Carriage lock mechanism and Capping mechanism with Wiper mechanism. Following table lists the function for each mechanism.

Table 2-4. Function for each mechanism

 

 

Mechanism

Function

 

 

Capping mechanism *

This is to cover the surface of the Printhead with the cap in

order to prevent the nozzle from increasing viscosity.

 

 

 

Wiper mechanism

This is to remove the foreign material and unnecessary ink on

the nozzle plate of the Printhead.

 

 

 

Pump mechanism

This is to eject the ink from the ink cartridge, the ink cavity and

the cap to the Waste drain ink pad.

 

 

 

Carriage lock mechanism

This is to lock the CR unit with the Change lever while the CR

unit is at the home position.

 

 

 

*Like the previous printers (Stylus COLOR 480/580), this printer adopts the valveless cap system. The air valve system used for the previous printer (Stylus COLOR 740) have two functions by the CR position in the capping condition as follows.

1) Valve closing condition (CL position)

By closing the air valve, the ink is forcibly absorbed from the ink cartridge or the ink cavity by the Pump unit and is ejected to the Waste drain ink pad while the CR unit is in the CL position.

2) Valve opening condition (Ink absorption position)

By opening the Air valve, the negative pressure is decreased and only the ink inside the Cap is ejected while the CR unit is in the further right side than the CL position. (the ink is not absorbed from the ink cartridge or the ink cavity.)

The following shows you the CR unit position for each condition easily.

Printing area

 

CR home position

 

CL position

 

Ink absorption position

 

 

 

 

(valve closing condition)

 

(valve opening condition)

 

 

 

 

 

 

 

 

 

 

But, on the valveless cap system, the above 2) operation is done outside the capping position. The CR unit moves outside the CR home position and the pump absorbs the ink inside the Cap.

2.1.5.1 Capping Mechanism

The Capping mechanism covers the Printhead with the Cap to prevent the nozzle from increasing viscosity when the printer is in stand-by state or when the printer is off. Unlike the previous printers (Stylus COLOR 480/580), the Cap unit is newly designed for this printer as follows.

1.Non porous pad in Cap

Due to this, the cap is newly designed as follows.

Ink eject hole

For Stylus Photo 810/820/830

Ink eject hole

Porous pad

For Stylus COLOR 480/580

Figure 2-11. Cap mechanism

The Cap unit used for the previous printers (Stylus COLOR 480/580) has the porous pad to keep the moisture in the Cap *1 and prevent that the air bubbles occur in CL sequence*2. The following points are modified to get the same effects on new Cap unit without the porous pad.

*1 : The diameter of the ink eject hole is smaller than that of Stylus COLOR 480 /580.

*2 : The cap is modified so that the ink flows with air bubbles to the ink eject hole in the ink absorption sequence more easily.

Operating Principles

Overview

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