Chapter
4 Replacing the Supplies
3. Replacing the Water Form Roller and Metering Roller
Metering roller
1) Mounting the water form roller
Generally the rubber roller shrinks over time and the diameter
becomes
smaller.
Especially,
if
using isopropyl alcohol,
the
shrinking will
be
intensified
and
the
hardness will
be
increased
20
to
30
% a year. As the
hardness
increases,
the
characteristics
of
the
roller
are
lost
and
the
dampening
solution supply balance will
become
unstable. This will result
in
stains
being caused and excessive emulsification occurring.
The
life
of
the
rubber
roller
is usually
from
6 months
to
one
year
after
starting initial printing
on
the press. After this period has passed, replace
the roller.
For
more
details, please ask
your
service technician.
(Note) 1. The replacement period
of
the roller will differ depending
on
the press using condition.
2.
When
doing printing with large solids
or
when
requiring
high
printing quality, the
replacement
period
of
the
roller
will
be
quicker.
(Reference)
When
keeping
an
extra roller for replacement,
if
the roller is
not
properly stored,
the
roller
may
be
damaged.
So
please
store
it
following
the
points below.
1.
Do
not
put the roller surface directly
on
the floor. It should
be
held
by
the
shaft
section as
shown
in
the illustration
on
the left.
2.
Store
the roller
in
a
cool
[below
2o·c
(68.F)]
dark
(no
light) place.
(Note)
Remove
the
water
rider oscillating roller before mounting
or
removing the
water
form roller.
Mount
the
water
form
roller
after
setting
the
water
form
roller
release
lever
(1)
at
the
It]
position.
After
mounting
it,
set
the
lever
at
the
IE]
position.
«NOTICE»
The
side
of
the
shaft
with
the
gear
is
the
operation
side.
If
reversing
the
water form roller mounting direction, the press may be damaged.
Align
the
water
form
roller
shaft
notch
with
the
stopper
and
push
the
roller
in
fully
and
then
tum
it
slowly
until there is a
response
until
the
roller
cannot
be
turned anymore.
Maintenance Edition -
41
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