Brother XR-7700 Guide D’Installation Rapide

31

The thread tension will affect the quality of your 
stitches. You may need to adjust it when you change 
fabric or thread.

● 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.

● If the bobbin thread was incorrectly 

threaded, the upper thread may be too tight. 
In this case, refer to “Lower threading” 
(page 15) and rethread the bobbin thread.

Solution
Reduce the tension by turning the upper 
tension-control dial to a lower number.

● When you finish sewing, remove the 

bobbin cover and then make sure that the 
thread is shown as below. If the thread is 
not shown as below, the thread is not 
inserted through the tension-adjusting 
spring of the bobbin case correctly. Reinsert 
the thread correctly. For details, refer to 
page 15, 16.

■ Upper tension is too loose

Loops appear on the wrong side of the fabric.

● If the upper thread was incorrectly 

threaded, the upper thread may be too 
loose. In this case, refer to “Upper 
threading” (page 17) and rethread the upper 
thread.

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

1

2

3

4

a Wrong side
b Surface
c Upper thread
d Lower thread

1

2

3

4

5

a Wrong side
b Surface
c Upper thread
d Lower thread
e Loops appear on 

surface of fabric

1

2

3

4

5

a Wrong side
b Surface
c Upper thread
d Lower thread
e Loops appear on 

wrong side of 
fabric