Thread Tension - Singer 812U Instruction Manual

In case of four-thread In case of five-thread
8 00 O
8 0080
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Thread tensian
Thread tension rnay require change depending on fabrics and threads used, bight, stitch length, the position of each
thread take-up, and the position of the thread guides.
If necessary, adjust as mentioned below.
®
o
G
1. Adjusting the overedge stitch needle thread
take-up,
To increase the thread tension, lower needle thread take-uptD .
To decrease it,
raise
the thread
take-up.
The center position in
the adjustable range is standard.
2. Adjusting the double-chain stitch needle thread guide.
Raise double-chain stitch needle thread guide
@)
to increase the
needle thread tension.
Or lower it to decrease the tension.
The standard needle thread tension is obtained when the guide
is in the center stitch position.
Use the thread take-up for two-thread
®
or for three-thread
®
as appropriate to your sewing purpose.
3.
Adjusting the overedge stitch looper thread
take-
ups and thread guide. .
4. Adjusting the double-chain stitch thread take-
up and thread guide.
=--~
Set screw
~
6'
Reference
""'~~Loo~
4fj
Tighten \
1
About6 mm
OQlOI
E1J Right hand looper
J,==8~~1=:::::::::=::::::I
thread guide
Looper thread
take-ups Jeft
(1) The above figure shows the standard positions of the
looper thread take-ups and each thread guide when
the needle bar is up highest.
(2) More thread will be fed when looper thread take-ups
right
4D,
m
are raised; and less thread when they are
lowered.
(3) More thread will be fed when left hand looper thread
guide
f&
is moved to the left (more angle); and less
thread when it is moved to the right
(less
angle).
(1) Thread take-up thread guides, right
~
and left fi) ,
must be positioned symmetrically in the thread take-
up thread guide hole with the reference line on thread
take-up holder
(li)
in the center.
(2) Thread handler
fD
must be positioned parallel to the
thread take-up holder.
(3) Adjust the timing of double-chain stitch thread take-
up assembly
«;
to pull back the looper thread when
the needle bar is in the highest position.
(
The height of the double-chaín stitch thread take-u p)
assembly from the thread take-up holder is about
6mm.
(4) The looper thread loosens when the double-chain stitch
thread take-up assembly is advanced (turned counter-
c1ockwise), and tightens when it is delayed (tumed
clockwíse).
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