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5. Balloon stitch
Irregular stitches
Cause (1)
Troubles
Cause (2)
Corrective measures
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Replace the needle with a proper one.
SCHMETZ UY180GVS is recommended.
Replace the needle.
Use a thick needle.
Correct the lateral position of needle.
Alignment of the center of needle hole of
throat plate with the center of needle is the
aim. However, especially when the needle
is located to the left side, draw-up by thread
take-up lever is hindered and balloon stitch
is apt to occur.
Adjust the initial position of the needle
bar in accordance with 4 - (14).
Clearance between needle bar and
presser bar is 9 mm.
If the clearance between needle and
needle hole is small when needle bar
goes up, thread take-up by the thread
take-up lever is hindered and especially,
balloon stitch at the overlapped section
is apt to occur.
Loosen the presser bar bracket and correct
the lateral position of presser.
It is the aim that the center of needle in
terms of the center of needle hole of
presser foot is slightly located to the right
side. However, especially when needle is
located to the left side, draw-up by thread
take-up lever is hindered and balloon stitch
is apt to occur.
Check again 4. - (1) Adjusting the height
of the needle bar. In case of 1.7 fold hook,
when the needle bar is excessively
lowered, needle thread is locked between
needle and the needle guard section of
inner hook at the lower dead point of the
needle bar, and balloon stitch is apt to
occur.
1)-A Kind of needle is
improper.
1)-B Blunt of needle tip
1)-C Needle is too thin for the
thread used.
2)-A Lateral position of needle
and needle hole in throat
plate is improper.
2)-B Position of needle and
throat plate is improper.
2)-C Lateral position of needle
and needle hole in the
presser foot is improper.
2)-D Height of needle bar is
too low.
5-1) Needle components
5-2) Position of needle is
improper.
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