Ink System Mechanism - Epson Stylus CX3700 Service Manual

EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850

2.2.5 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
This is to cover the surface of the Print Head with the cap in
Capping mechanism *
prevent the nozzle from increasing viscosity.
order to
This is to remove the foreign material and unnecessary ink on
Wiper mechanism
the nozzle plate of the Print Head.
This is to eject the ink from the Ink Cartridge, the ink cavity and
Pump mechanism
the cap to the Waste Ink Pad.
This is to lock the Carriage Unit with the Change Lever while
Carriage lock mechanism
the Carriage Unit is at the home position.
Note : Like the previous printers (Stylus Photo R300/R310), 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.
OPERATING PRINCIPLES
Function
Printer Mechanism
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 Ink Pad while
the Carriage 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 Carriage 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 Carriage Unit position for each condition easily.
CL position
Printing area CR home position
(valve closing condition)
But, on the valveless cap system, the above 2) operation is done outside the
capping position. The Carriage Unit moves outside the CR home position and
the pump absorbs the ink inside the Cap.
Revision A
Ink absorption position
(valve opening condition)
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