Huskylock 340D - Adjusting Thread Tensions; Thread Tension Balance

01/23/2008
ADJUSTING THREAD
TENSIONS
Thread
tensions
will
vary
according
to
the
type
and
thickness
of
both
thread
and fabric.
Turning
the
tension
controls
clockwise
will
increase
tension
(+)
and
anti-clockwise
(—)
decrease
tension.
All the
control
knobs
can
be
turned
about
1
%
rotations.
The
correct
balance
of
stitch
should
look
as follows:
UPPER
LOOPER
THREAD
should
lie
flat
on
the top-side
of
fabric
and lock
with
the
lower
looper
thread
on the
edge
of the
material.
LOWER
LOOPER
THREAD
should
lie
flat
on
the
underside
of fabric
and
lock
with
the
upper
looper
thread
on the
edge
of
the
material.
NEEDLE
THREADS
act
as ‘safety
stitches’
and
should
lie mainly
on the
top side
(like
rows
of normal
straight
sewing)
on
the upper
looper
thread,
and just
visible
in
the lower
looper
thread
on
the
underside
of the fabric.
If threads
do
not
appear
as above,
adjust
as
follows:
First turn
all
tension
controls
anti-clockwise
until they
stop
at the
‘0’
setting.
Then
turn
each
knob
clockwise
to
the
following
settings;
left needle
thread
tension
knob
to
“4”
right
“ to
“2”
upper
looper
thread
“ to
“3”
lower
“ to
“3”
Now
sew
the
fabric
again and
compare
with
Fig.
1,
page
13.
If
the upper
looper
thread
is seen
to be
loose,
or
is pulled
over
to the
underside
of
the fabric
(as
Fig. 2,
page
13),
increase
upper
looper
tension
(Blue)
and/or
decrease
lower
looper
tension
(Purple).
If lower
looper
thread
is
seen
pulled
up
onto
the
top-side
of fabric
(Fig.
3, page
13),
increase
lower looper
tension
(Purple)
and/or
decrease
upper
looper
tension
(Blue).
If
left
needle
thread
is
loose and
clearly
visible
on
underside
of fabric
(Fig.
4,
page
13),
increase
left needle
thread
tension
(Green)
and/or
decrease
either
or both
looper
threads.
If right
needle
thread
is loose
and
clearly
visible
on
underside
of fabric
(Fig.
5,
page
13),
increase
right
needle
thread
tension
(Yellow).
A simple
amount
of
experimenting
will
quickly
achieve
a correctly
balanced
stitch.
Right
needle
thread
tension
control
Lower
looper
tension
control
Left needle
thread
tension
control
Upper
looper
tension
control