18
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.
To test if the bobbin thread tension is
correct, suspend the bobbin case by the
thread and jerk it once. Correct bobbin
tension will result in the thread unwinding
only one or two inches. If too loose it will
unwind continuously. If too tight the thread
will not unwind at all.
When adjusting the tension on the bobbin
case, make only slight adjustments with a
screwdriver.
Fabric puckers
Increase
Decrease
Presser foot lifter
1
3
2
Foot holder
ADJUSTING BOBBIN THREAD TENSION
Foot release lever
CHANGING PRESSER FOOT
Be sure needle is in the up position.
Raise presser foot lifter.
1. Push presser foot release lever to
remove the foot.
2. Place the desired foot on the needle
plate aligning the presser foot pin with
the foot holder.
3. Lower the presser foot lifter so that the
foot holder snaps on the foot.
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