Bobbin case tension

■Bobbin tension is too tight

Loops appear on the wrong side of the fabric.

adjustment

The bobbin thread tension has already been adjusted at the factory for general use. For most sewing applications, no adjustment is needed.

When sewing with thin thread on thin fabrics, the thread tension may not be adjusted adequately with the upper tension control dial. Therefore, the thread tension must be adjusted according to the procedure

15

2

3

4

aWrong side

bSurface

cUpper thread

dLower thread

eLoops appear on wrong side of fabric

described below.

Note

●Remember to return the screw to its original setting before starting your next project.

■Bobbin tension is too loose

Loops appear on the surface of the fabric.

1

 

 

a Wrong side

 

 

b Surface

2

 

c Upper thread

 

d Lower thread

 

 

 

 

e Loops appear on

3

5

surface of fabric

 

4

Solution

Reduce the tension by turning the upper tension- control dial to a lower number.

Note

●If the loops still appear on the surface of the fabric after you adjust the upper tension, the bobbin thread may be too loose. In this case, turn the screw clockwise, being careful not to over-tighten the screw, approximately 30-45 degrees to increase bobbin tension. After you adjust the bobbin thread, adjust the upper thread to match the bobbin thread.

aScrew

Solution

Increase the tension by turning the upper tension- control dial to a higher number.

Note

●If the loops still appear on the wrong side of

the fabric after you adjust the upper tension,

4

 

the bobbin thread may be too tight. In this

 

case, turn the screw counterclockwise being

 

careful not to over-loosen the screw,

 

approximately 30-45 degrees to decrease

 

bobbin tension. After you adjust the bobbin

 

thread, adjust the upper thread to match the

 

bobbin thread.

 

 

 

 

 

aScrew

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