Upper Thread Is Too Tight
Symptom
The upper thread appears as a single continuous line.
The bobbin thread is visible from the right side of the fabric. (Refer to the illustration below.)
The upper thread has tightened up, and comes out when pulled.
The upper thread has tightened up, and wrinkles appear in the fabric.
The upper thread tension is tight, and the results do not change even after the thread tension is adjusted.
- Wrong side of fabric
- Bobbin thread visible from right side of fabric
- Upper thread
- Right side of fabric
- Bobbin thread
Cause
Incorrect bobbin threading
If the bobbin thread is incorrectly threaded, instead of the appropriate tension being applied to the bobbin thread, it is pulled through the fabric when the upper thread is pulled up. For this reason, the thread is visible from the right side of the fabric.
Remedy
Correctly install the bobbin thread. (Setting the Bobbin)