KD40s
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Incorrect thread tension
When the thread tension is incorrect, check the machine according the following procedure.
(1) Wrong side of fabric
(4) Right side of fabric |
>> The bobbin threading is incorrect.
Return the thread tension dial to "4", and then refer to "Upper thread tightened up".
(1) Wrong side of fabric (2) Upper thread visible from wrong side of fabric (3) Upper thread (4) Right side of fabric (5) Bobbin thread |
The 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 "Combination of fabric, thread and needle" to check that a needle and thread appropriate for the fabric are being used.
Select an appropriate thread tension. The appropriate thread tension differs depending on the type of fabric and thread being used.
If the bobbin thread is visible from the right side of the fabric
(1) Wrong side of fabric
(4) Right side of fabric |
>> Turn the thread tension dial counterclockwise to loosen the upper thread tension.
If the upper thread is visible from the wrong side of the fabric
(1) Wrong side of fabric (2) Upper thread visible from wrong side of fabric (3) Upper thread (4) Right side of fabric (5) Bobbin thread |
>> Turn the thread tension dial clockwise to tighten the upper thread tension.