Checking Performance Problems WHATTODO
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PROBLEM PROBABLE CAUSE CORRECTION
|rregular
Stitches
Incorrect size needle.
improper threading;
Light pressure on presser foot.
Loose presserfoot,
Unevenly wound bobbin,
Nicks or burrs on shuttle,
Nicks or burrs at hole of needle
plate, i!; _
Choose correct size needle for thread and fabric.
Rethread machine.
Tighten upper thread tension.
Do not pull fabric; guide it gently.
Increase pressure on presser foot.
Reset presser foot.
Rewind bobbin.
Replace shuttle, or polish off burrs completely,
Replace needle plate; or polish off burrs completely.
Breaking
Needle
Pulling fabric.
Incorrect size needle.
Incorrect setting of needle.
Loose presser foot;
Do not pull fabric; guide it gently.
Choose correct size needle for thread and fabric.
Reset needle.
Reset presserfoot,
Bunching of
Thread
backunder presser foot before
starting; seam.
lnco, ectthreadltensiOn(s).....
Light pressure on presser foot:
Using: twodifferent sizes or kinds
of thread.;
Bent: or blunt needle.
Loose presser: foot_:
Fabri¢! too::sheer!or tOO..soft; _
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When starting a seam be sure to draw both threads under and
back of presser foot about 4" and hold until a few stitches
are formed.
Reset thread tension(s).
Increase pressure on presser foot.
Upper thread and bobbin thread should be same size ancj kind.
insert new needle;
Reset presser foot.
Use underlay of tissue paper.
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