Brother BM3700 User Manual

SEWING BASICS ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
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27
Thread tension
The tension of the thread will affect the quality of your
stitches. You may need to adjust it when you change
fabric or thread.
Memo
● We recommend that you do a test sample
on scrap of a fabric before you start to sew.
■ Correct tension
Correct tension is important as too much or too little
tension will weaken your seams or cause puckers
on your fabric.
■ Upper tension is too tight
Loops will appear on the surface of the fabric.
Note
● If the bobbin thread was incorrectly
threaded, the upper thread may be too tight.
In this case, refer to “Lower threading” on
page 15 and rethread the bobbin thread.
Solution
Reduce the tension by turning the upper tension
control dial to a lower number.
■ Upper tension is too loose
Loops appear on the back of the fabric.
Note
● If the upper thread was incorrectly threaded,
the upper thread may be too loose. In this
case, refer to “Upper threading” on page 17
and rethread the upper thread.
Solution
Increase the tension by turning the upper tension
control dial to a higher number.
1 Surface of fabric
2 Back of fabric
3 Upper thread
4 Lower thread
1 Surface of fabric
2 Back of fabric
3 Upper thread
4 Lower thread
5 Loops appear on
surface of fabric
1
2
3
4
1
2
3
4
5
1 Surface of fabric
2 Back of fabric
3 Upper thread
4 Lower thread
5 Loops appear on back
of fabric
1
2
3
4
5

Brother BM3700 Specifications

General

Type	Automatic sewing machine
Free arm	Yes
Product color	White
Buttonhole type	-
Number of programs	74
Sewing machine functions	Sewing
Number of stitch patterns	37
Power supply type	Electric

Weight and Dimensions

Depth	159 mm
Width	389 mm
Height	300 mm