9. Adjusting
the
thread
tension
Decreased
Decreased
Moving
range
V\S—Increased
Thread
tension
No.
1
Thread
tension
bar
Increased
Thread
tension
No.
2
thread
take-up
spring
Tension
bracket
set
screw
Thread
tension
bar
set
screw
Thread
tension
socket
Thread
take-up
spring
(Note)
When using a thin cotton or synthetic thread,
excessive
tension
or
stroke.
Otherwise, stitch may be skipped at the end of
Needle
thread
tension:
Needle thread tension is adjusted by the thread
tension
nuts
No. 1
and
No, 2
thread
tension
is
increased by a clockwise turn and reduced by a
counter-clockwise
turn,
o
Thread
tension
No.
1.
The length of needle thread remaining in the
needle
after
thread trimming becomes
short
when
the
thread
tension
nut
No. 1 is
tight
ened, and vice versa. Tighten the tension
nut
when
a
thin
thread
like
synthetic
thread
is
used
and
loosen
it
when
a
thick
thread
is
used.
o
Thread
tension
No.
2
Adjust the thread tension nut No. 2 so that
the
needle
and
bobbin
threads
are
inter-
looped in the middle of the material. Do not
excessively reduce the thread tension when
sewing with a synthetic thread, or the
thread may be broken at the start of sewing.
Thread
take-up
spring
Adjust the thread take-up spring for the follow
ing
standard:
Thread
Thread
No.
Stroke
Tension
Cotton
#40
or
less
7
to
10
mm
(9/32"
to 25/64")
20 to 35g
Cotton
#50
or
more
6
to
9
mm
(15/64" to 23/64")
15 to 30g
Synthetic
6
to
9
mm
(15/64"
to 23/64")
7 to 20g
o To change the stroke of the thread take-up
spring, loosen the screw of the thread
tension post socket and turn the thread
tension post in either direction,
o To change the tension of the thread
tate-up
spring, loosen the screw of the thread
tension post socket, remove the thread
tension post and adjust the tension after
loosening
the
set
screw.
Tension is increased by turning the thread
tension post in the clockwise direction, and
vice
versa.
take
care not to provide
the
take-up spring with an
sewing and the threads will not be trimmed.
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16
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