Filter
Top Products
182
APPENDIX — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Incorrect thread tension
■ Symptoms
• Symptom 1: The lower thread is visible from the upper side of the fabric.
• Symptom 2: The upper thread appears as a straight line on the upper side of the fabric.
• Symptom 3: The upper thread is visible from the lower side of the fabric.
• Symptom 4: The lower thread appears as a straight line on the lower side of the fabric.
• Symptom 5: The stitching on the lower side of the fabric is loose or has slack.
■ Cause/remedy/check details
Cause 1
The machine is not correctly threaded.
<With symptoms 1 and 2 described above>
The bobbin threading is incorrect.
Return the upper thread tension to the standard
setting, and then refer to "Upper thread tightened
up" (page 178) to correct the threading.
<With symptoms 3 through 5 described above>
The upper threading is incorrect.
Return the upper thread tension to the standard
setting, and then refer to "Tangled thread on
wrong side of fabric" (page 179) to correct the
upper threading.
Cause 2
A needle and thread appropriate for the fabric
are not being used.
The sewing machine needle that should be used
depends on the type of fabric sewn and the thread
thickness.
If a needle and thread appropriate for the fabric
are not being used, the thread tension will not be
adjusted correctly, causing wrinkles in the fabric
or skipped stitches.
• Refer to "Selecting the needle depending on
the thread and fabric types" (page 39) to
check that a needle and thread appropriate
for the fabric are being used.
Cause 3
The setting selected for the upper thread tension
is not appropriate.
Refer to "Adjusting the stitch length" (page 62) to
select an appropriate thread tension.
The appropriate thread tension differs depending
on the type of fabric and thread being used.
* Adjust the thread tension while test sewing
on a piece of scrap fabric that is the same as
that used in your project.
Note
z If the upper threading and bobbin threading
are incorrect, the thread tension cannot be
adjusted correctly. Check the upper
threading and bobbin threading first, and
then adjust the thread tension.
If the bobbin thread is visible from the right
side of the fabric
Turn the thread tension dial to the left to
loosen the upper thread.
If the upper thread is visible from the wrong
side of the fabric
Turn the thread tension dial to the right to
tighten the upper thread.
Symptom 1 Symptom 3
a Lower side of fabric
b Lower thread visible from
upper side of fabric
c Upper thread
d Upper side of fabric
e Lower thread
f Upper thread visible from
lower side of fabric