Epson Stylus Color 670, Руководство по обслуживанию

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EPSON Stylus COLOR 670 Revision A
Operating Principles Overview 33
2.1.2 Printhead
The printhead uses a new developed E-CHIPS+ 1 head method and EPSON
Stylus COLOR 670 can perform multiple shot printing and variable printing.
Printhead nozzle configuration is as follows.
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32 nozzles x 5 rows (nozzle pitch of each row: 1/90 inch)
For black nozzles : 2 rows x 32 nozzles
For color nozzles : 3 rows x 32 nozzles
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Ink configuration: black, cyan, magenta, yellow (aligned in this order)
The basic operating principles of the printhead, which plays a major role in
printing, are the same as previous models; on-demand method which uses
PZT (Piezo Electric Element). In order to uniform the amount of ejecting ink,
each printhead has its own head ID (10 figures for EPSON Stylus COLOR 670)
which adjust PZT voltage drive features. The printhead stores the head ID to
EEPROM and generates appropriate PZT drive voltage to prevent amount of
ink from varying by printheads.
Following explains printhead basic components.
o
PZT
PZT is an abbreviation of Piezo Electric Element. Certain amount of
voltage expands and contracts PTZ. The drive wave generated on
MAIN board drives PZT and PZT pushes the top cavity which has ink
stored to discharge the ink from each nozzle on the nozzle plate.
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Ink Cavity
The ink absorbed from the ink cartridge goes through the filter and
then is stored temporarily in this tank called “cavity” until PZT is
driven.
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Nozzle Plate
The board with nozzle holes on the printhead surface is called Nozzle
Plate.
o
Filter
When the ink cartridge is installed, if any dirt or dust around the
cartridge needle is absorbed into the head, there is a great possibility
of causing nozzle clog and disturbance of ink flow, and finally causing
alignment failure and dot missing. To prevent this problem, a filter is
set below the cartridge needle, where ink is filtered.
Figure 2-2. Printhead Sectional Drawing
Nozzle Selector Board
I/C Sensor Lever
Needle
Ink Cartridge
Filter
Cavity
PZT
Nozzle Plate