Brother International HS-5300 Service Manual - Page 36

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2.2.2 Structure of the Print Head (1) Front end Each Front end has 128 nozzles arranged in zigzags and fires the ink supplied from the Back end in drops. (2) Back end The Back end is connected to four (four-color) Front ends and supplies the hot melt ink in each color to the respective Front end. Solid ink in the ink supply unit is melted and supplied to the Front end through the ink circulation passage. • Ink melting tank The ink melting tank melts solid ink in the ink supply unit and supplies the melted ink to the ink tank. • Ink tank The ink tank keeps the hot melted ink and supplies it to the Front end when required. The ink tank has a two-chamber structure and also keeps the ink circulated by purging. The chambers are always connected to keep the same ink level in the two chambers. • Filter The filter eliminates foreign objects and air bubbles included in the hot melted ink supplied from the ink tank to the Front end, resulting in uniform and consistent ink firing from the Front end. • LOIS The LOIS detects a low ink level in the ink tanks. • Purge lever The purge lever functions when a purge is carried out. The purge lever disconnects the two chambers in the ink tank to create an ink circulation passage. • Ink circulation mechanism (purge mechanism) The ink circulation mechanism (purge mechanism) circulates the hot melted ink in the four individual colors that is remaining in the print head passage when the printer is turned ON or carrying out the purge from the control panel. When circulating the ink, it supplies new ink to the Front end through the filter and passes the old ink in the Front end (containing any air bubbles and foreign objects) to the ink tank in order to ensure optimal ink firing status. II-17

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2.2.2
Structure
of
the
Print
Head
(1)
Front
end
Each
Front
end
has
128
nozzles
arranged
in
zigzags
and
fires
the
ink
supplied
from
the
Back
end
in
drops.
(2)
Back
end
The
Back
end
is
connected
to
four
(four-color)
Front
ends
and
supplies
the
hot
melt
ink
in
each
color
to
the
respective
Front
end.
Solid
ink
in
the
ink
supply
unit
is
melted
and
supplied
to
the
Front
end
through
the
ink
circulation
passage.
•
Ink
melting
tank
The
ink
melting
tank
melts
solid
ink
in
the
ink
supply
unit
and
supplies
the
melted
ink
to
the
ink
tank.
•
Ink
tank
The
ink
tank
keeps
the
hot
melted
ink
and
supplies
it
to
the
Front
end
when
required.
The
ink
tank
has
a
two
-chamber
structure
and
also
keeps
the
ink
circulated
by
purging.
The
chambers
are
always
connected
to
keep
the
same
ink
level
in
the
two
chambers.
•
Filter
The
filter
eliminates
foreign
objects
and
air
bubbles
included
in
the
hot
melted
ink
supplied
from
the
ink
tank
to
the
Front
end,
resulting
in
uniform
and
consistent
ink
firing
from
the
Front
end.
•
LOIS
The
LOIS
detects
a
low
ink
level
in
the
ink
tanks.
•
Purge
lever
The
purge
lever
functions
when
a
purge
is
carried
out.
The
purge
lever
disconnects
the
two
chambers
in
the
ink
tank
to
create
an
ink
circulation
passage.
•
Ink
circulation
mechanism
(purge
mechanism)
The
ink
circulation
mechanism
(purge
mechanism)
circulates
the
hot
melted
ink
in
the
four
individual
colors
that
is
remaining
in
the
print
head
passage
when
the
printer
is
turned
ON
or
carrying
out
the
purge
from
the
control
panel.
When
circulating
the
ink,
it
supplies
new
ink
to
the
Front
end
through
the
filter
and
passes
the
old
ink
in
the
Front
end
(containing
any
air
bubbles
and
foreign
objects)
to
the
ink
tank
in
order to
ensure
optimal
ink
firing
status.
II
-17