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An ideal straight stitch will have threads locked between the two
layers of fabric.
Upper thread too tight
®
Decrease | tension |
|
Upper thread too loose |
| |
® |
|
|
Increase | Tension | ) |
| ||
Increase
Decrease
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ADJUSTING TOP THREAD TENSION
Probably the most important control on your machine is this one that regulates your top thread tension.
There are many reasons for having to reset your tension. The best tension for one fabric may not I_e correct for another. The required tension depends upon the stiffness of the fabric, thickness of the fabric, numbers of layers of fabric being sewn, as well as the type of stitch you are making.
It is best to test the stitching on a scrap of the fabric you are using before starting to make a garment. Use the straight stitch function as shown at the right.
ADJUSTING BOBBIN THREAD TENSION
When stitching is unsatisfactory in figures 2 and 3 above, adjust the upper thread tension.
LOWER THREAD TENSION REQUIRES
ADJUSTMENT LESS FREQUENTLY THAN THE UPPER THREAD TENSION.
When stitch is satisfactory, as in Fig. 1 and seam is badly puckered, the cause may be tight tensions and both upper and lower may have to be adjusted.
When adjusting the tension on the bobbin
case, make slight adjustments with a screw- driver.
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