Adjusting the Thread Tension
The tensions of the upper thread and of the bobbin thread (thread tension) should be adjusted so that they are equal.
Thread tension
You may need to change the thread tension, depending on the fabric and thread being used.
■Correct thread tension
The upper thread and the bobbin thread should cross near the center of the fabric. Only the upper thread should be visible from the right side of the fabric, and only the bobbin thread should be visible from the wrong side of the fabric.
1
2
3
4
aWrong side of fabric
bRight side of fabric
cUpper thread
dBobbin thread
■Upper thread is too tight
If the bobbin thread is visible from the right side of the fabric, the upper thread is too tight.
Note
zIf the bobbin thread was incorrectly threaded, the upper thread may be too tight. In this case, refer to “Installing the bobbin” (page 26) and rethread the bobbin thread.
1
2
3 | 5 |
|
4
aWrong side of fabric
bRight side of fabric
cUpper thread
dBobbin thread
eThe bobbin thread is visible from the right side of the fabric.
■Upper thread is too loose
If the upper thread is visible from the wrong side of the fabric, the upper thread is too loose.
Note |
| 2 |
zIf the upper thread was incorrectly threaded, the upper thread may be too loose. In this case, refer to “Upper Threading” (page 28) and rethread the upper thread.
5
1
2
3
4
aWrong side of fabric
bRight side of fabric
cUpper thread
dBobbin thread
eThe upper thread is visible from the wrong side of the fabric.
Adjusting the Thread Tension 57