From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
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·.-
.
=:
..
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TROUBLE
SHOOT
If
following problems
be
occurred, please check the points as suggested below.
• -marked be checked carefully .
..
-marked be most carefully checked.
Thread breakage
••
-Any
damage
on
the hook? (Please carefully
checl<
on
th
C:.
hook poin
t}
.
-
Is
Urning
between needle and hook correct?
• - Isn't hook point worn out?
• - ls quality
of
thread good?
- Any scratch
oo
thread guides? .
• •
-Any
damage
0~
s~ra~ti
on
-h
~ok
re~ne'r? ·
-
Is
needle all right?
-
Any
damage
on
needle plate, pa
rtl
cuiarly around needfe hole?
- ls check spring correct,
not
too
hard?
-No
lints In bobbin qase?
Celth breakage ..
''
.
• - Isn't the machine too
old
to cause excessive play
on
all moving parts?
• -
Does
needle penetrate center of
needle
hole
on
needle
ptate?
• - No bent needle used?
• -
No
too much play
on
zig
zag drive
forl<?
-
rs
thread tension correct?
Skipping
of
stitch
•
-ls
the timing
of
needle
to
hook correct? Not too early, not too late? ·
-No
bent needle used?
.-No
worn ~ut
on
hook point?
• - No excessive play
on
_needle bar?
• -
No
excessive clearance between needle and hook point?
• - Isn't needle hole
of
needle plate too large to the·siz~ of needfe
11sed
?
Thread Breakage {on
straight
sewing)
• - No excessive clearance between needle and hook point?
• -
Is
hook timing correct?
Not
too early?
• - Isn't check spring too hard?
• - Does check spring moves freely?
Needle Breakage
• - Doesn't needle hit needle plate?
• -
Is
the clearance between needle and hook point correct?
- No excessive play on needle bar frame?
-
No
excessive play
on
hook shaft thrust collar?
11
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