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R 8004
Correct
Tension
Regulation
Balanced tensions are essential for sewing. If your tension is correct, you will
have perfect seams as sketched below (Ill).
Sketch I
—
The threads interlock on the underside of the fabric.
Ca use:
Upper tension too loose or lower tension too tight.
Sketch II
—
The threads interlock on the surface of the fabric.
Ca use:
Upper tension too tight or lower tension too loose.
To check whether the tensions ore correctly balanc
ed, take a closely woven piece of fabric and sew
a few stroighi and zigzag seams. If the straight
stitches are tightly drawn in on both sides of the
fabric (see seam sketch Ill), the tensions are cor
rect. The surest way to double-check this is by ex
amining a zigzag seam, If the zigzag seam is
equally wide on surface and underside of the
fabric, that is if the threads are locked exactly at
the zigs ond zags of the seam, the tension adlust
ment is correct.
A
20
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