Singer Sewing Machine Instruction Manual page 37

REASONS
MAKES LOOSE STITCHES AND LOOPS ON UNDERSIDE
OF FABRIC.
a) Threading is incorrect.
b) Presser foot is not
completely lowered.
c) Insuffi cient needle thread
tension.
d) Thread take-up spring is
bent or broken.
e) Poor stitches and bad
seams for following
reasons:
1. The bobbin is wound
unevenly.
2. Upper thread tension is
too tight or too loose.
3. Bobbin thread is too
coarse for material.
4. The needle is not suited
for material.
5. Needle damaged.
6. Uneven thread tension
likely to be caused by
thread of poor quality.
IF THE MATERIAL PUCKERS
a) The needle thread tension
is too tight.
b) The needle and the bobbin
thread are too tight for the
fabric.
c) Too much pressure applied
to the presser foot.
IF THE MACHINE JAMS OR CLOGS
a) The machine is not
properly threaded.
b) Running the machine
without fabric.
c) Sewing with the stitch
regulator lever at 'O'.
CORRECTIONS
a) Correctly thread machine.
b) Check whether Presser foot is
down.
c) Adjust thread tension.
d) Change the spring.
e)
1. Adjust the bobbin winder
thread guide.
2. Adjust the upper thread
tension.
3. Use thread of same size as the
needle thread.
4. Use fi ner needle and thread
which is suitable for the fabric.
5. Change the needle.
6. Change the thread.
a) Loosen the tension.
b) Loosen both tensions.
c) Release the pressure of presser
foot and adjust.
a) Correct the threading.
b) Do not operate the machine
without fabric. Clean the
shuttle race.
See "When the shuttle hook
becomes jammed" under
"Helpful Hints".
c) Increase stitch length
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