Brother International Simplicity SB3129 Users Manual - English - Page 60
Adjusting the Thread Tension
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SEWING BASICS 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. Changing the tension of the upper thread Turn the thread tension dial to the left to loosen the upper thread. If the thread and needle combination is correct for the type of fabric being sewn (according to "Needle types and their uses" on page 33), the thread tension will automatically be adjusted to the appropriate setting. However, if the preset thread tension does not give the desired result or if you are sewing with special thread or on special fabric, use the thread tension dial under the upper cover to adjust the tension of the upper thread. ■ 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 ■ 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 ● If the upper thread was incorrectly threaded, the upper thread may be too loose. In this case, refer to "Upper Threading" on page 24 and rethread the upper thread. 2 3 4 1 Wrong side of fabric 2 Right side of fabric 3 Upper thread 4 Bobbin 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 ● If the bobbin thread was incorrectly threaded, the upper thread may be too tight. In this case, refer to "Installing the bobbin" on page 22 and rethread the bobbin thread. 1 2 3 5 4 1 Wrong side of fabric 2 Right side of fabric 3 Upper thread 4 Bobbin thread 5 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. 1 2 3 5 4 1 Wrong side of fabric 2 Right side of fabric 3 Upper thread 4 Bobbin thread 5 The bobbin thread is visible from the right side of the fabric. 54