Upper tension is too tight; Upper tension is too loose ; When changing the sewing direction, be - Page 32

Brother ST371HD Use and Care Manual

Table of Contents

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SEWING BASICS   

31

7

Start sewing.

For details on starting to sew, refer to “Starting 
sewing” on page 27.

X

Two lines of stitching are sewn parallel to 
each other.

Note

When using the twin needle, the stitches 
may become bunched together, depending 
on the types of thread and fabric that are 
used. If this occurs, increase the stitch 
length. For details on adjusting the stitch 
length, refer to “Stitch length dial” on 
page 14.

CAUTION

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 18 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 20 
and rethread the upper thread.

Solution
Increase the tension by turning the upper tension 
control dial to a higher number.

When changing the sewing direction, be 
sure to raise the needle from the fabric, 
and then raise the presser foot lever and 
turn the fabric. Otherwise the needle 
may break or the machine may be 
damaged.

1

Surface of fabric

2

Back of fabric

3

Upper thread

4

Lower thread

1

2

3

4

1

Surface of fabric

2

Back of fabric

3

Upper thread

4

Lower thread

5

Loops appear on 
surface of fabric

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

1

2

3

4

5

Detailed Information for Brother ST371HD Use and Care Manual

Lists of information found in Brother ST371HD Use and Care Manual - Page 32

  • 27. X Two lines of stitching are sewn parallel to each other.
  • 14. CAUTION Thread tension The tension of the thread will affect the quality of your stitches.

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