Kenmore 1660 - Manual (Page 11)

STRAIGHT STITCHING
Under
side
Well balanced
Top stitch
too tight
X .
D«cr«s«« IncrMM
tension tension
Top Stitch
too loose
ZIGZAG STITCHING
Fabric
puckers
ADJUSTING TOP THREAD
TENSION
STRAIGHT STITCHING
The good looking appearance of your
stitching Is largely determined by the
balanced tension of both top and bobbin
threads. The tension is well balanced
when these two threads 'lock' In the
middle of layers of fabric you are
sewing.
If, when you start to sew, you find that
the stitching is Irregular, you will need to
adjust the tensron control.
Make any adjustments vyith presser foot
'down'.
1. If the threads are locking on the top
surface with the top thread lying flat,
the top stitch is too tight. Tension
can oe decreased by turning the
tension control to lower numbers.
2. If the reverse is happening with the
threads on the underside of the
fabric, (fie tension is too loose. This
can be corrected by turning the
tension control to higher numbers.
ZIGZAG STITCHING
The top thread may appear on the
bottom depending on the thread, fabric,
type of stitch and sewing speed, but the
bobbin thread must never appear on the
top of the fabric.
ADJUSTING BOBBIN
THREAD TENSION
BOBBIN THREAD TENSION REQUIRES
ADJUSTMENT LESS FREQUENTLY
THAN THE TOP THREAD TENSION.
If the tension is well balanced, but the
fabric puckers badly, both top and
bobbin thread tensions may be too tight
and have to be adjusted.
When adjusting the tension on the
bobbin case, make only slight adjust­
ments with a srewdriver.