Brother International SM3701 Operation Manual - Page 30
Thread tension
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SEWING BASICS CAUTION ● When changing the sewing direction, be sure to raise the needle from the fabric, and then raise the presser foot lever and turn the fabric. Otherwise the needle may break or the machine may be damaged. Thread tension The tension of the thread will affect the quality of your stitches. You may need to adjust it when you change fabric or thread. Memo ● We recommend that you do a test sample on scrap of a fabric before you start to sew. ■ Correct tension Correct tension is important as too much or too little tension will weaken your seams or cause puckers on your fabric. 2 ■ Upper tension is too loose Loops appear on the back of the fabric. Note ● If the upper thread was incorrectly threaded, the upper thread may be too loose. In this case, refer to "Upper threading" on page 19 and rethread the upper thread. 25 1 3 4 1 Surface of fabric 2 Back of fabric 3 Upper thread 4 Lower thread 5 Loops appear on back of fabric Solution Increase the tension by turning the upper tension control dial to a higher number. 1 3 4 1 Surface of fabric 2 Back of fabric 3 Upper thread 4 Lower thread ■ Upper tension is too tight Loops will appear on the surface of the fabric. Note ● If the bobbin thread was incorrectly threaded, the upper thread may be too tight. In this case, refer to "Lower threading" on page 17 and rethread the bobbin thread. 2 1 3 5 4 1 Surface of fabric 2 Back of fabric 3 Upper thread 4 Lower thread 5 Loops appear on surface of fabric Solution Reduce the tension by turning the upper tension control dial to a lower number. 29