Singer Sewing Machine, Instruction Manual

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GROUP 3: SHUTTLE TRANSMISSION GROUP
Adjusting Upper Thread Tension
The correct stitch can usually be obtained by varying the
upper thread tension.
NOTE: TENSION ADJUSTMENT SHOULD BE MADE
WITH THE PRESSER FOOT DOWN.
To increase the tension, turn the tension dial clockwise (Fig.
32). To decrease the tension, turn the tension dial counter
clockwise (Fig. 32). When the tension is properly adjusted, the
upper and lower threads will cross in the center of the material
(Fig. 33-A).
When the upper thread tension is too tight, or the bobbin
tension is too loose, the lower thread will lay
fl at along the top
of the material (Fig. 33-B).
When the upper thread tension is too loose or the bobbin
tension too tight, the upper thread will lay
fl at along the bottom
of the material (Fig. 33-C).
The tension should be adjusted gradually until the desired
tension is obtained.
Adjusting Bobbin Thread Tension
1. The bobbin thread tension on your machine is correctly
adjusted before leaving the factory. Therefore, it is seldom
necessary to alter the bobbin thread tension. Should it become
necessary to do so, the adjusting screw of the tension spring on
the outside of the bobbin case can be tightened or loosened to
increase or decrease the tension of the bobbin thread.
2. To increase the bobbin
thread tension, turn the
adjusting screw clockwise. To
decrease tension of the bobbin
thread, turn the adjusting
screw counter clockwise.
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