Brother MFC-3340CN Service Manual page 65
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Also See for MFC-3340CN:
- Manual (231 pages) ,
- Manual de l'utilisateur (233 pages) ,
- User manual (220 pages)
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Damping
Without damping, ink pressure fluctuations directly affect the size of ink-jet head droplets, risking
lower print quality.
The damper structure for black differs from that for the colors (C, M, and Y) because black has
twice nozzles used for each color, meaning higher ink flow rates and bigger pressure fluctuations.
- Color dampers
The three color damper assemblies each have two chambers. The one on the right in the illustration
serves as the damper. The air at the top constitutes a cushion that expands and contracts to absorb
the pressure fluctuations caused by the inertia of the ink in the supply tubes as the head/carriage unit
travels.
- Black damper
The black damper assembly is not partitioned into two chambers. Instead, it has a loose film across
the bottom of its single chamber. This film immediately flexes in and out in response to rises and
falls in pressure, adjusting the chamber volume to counteract pressure fluctuations in the ink supply
tubes.
Air buffering
Liquid ink contains trace amounts of air. These molecules coalesce into air bubbles as the
piezoelectric ceramic actuators vary the pressure on the ink in the ink-jet head channel. (See the
illustration on
page
3-11.) Removing as many of these bubbles as possible before the ink reaches the
ink-jet head is essential to maintaining proper print quality. The above illustrations show how the
damper assemblies provide air buffers, the chambers on the left, for consolidating these air bubbles
away from the ink-jet head and vent flow paths for purging them at regular scheduled intervals.
Color
Black
3-14
Film
This loose film flexes in and out in
response to changes in ink pressure.
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