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Adjustment
Procedures
1)
Height of the upper looper
CD
Set a hexagon screwdriver onto setscrew 8
at
the
end
of
upper
looper bracket
O to adjust height
f).
@ When adjusting the height, pay attention also to the clearance
produced between the upper looper and the lower looper at
the time of their crossing.
2)
Longitudinal position of the upper looper
CD
Loosen setscrew 8 at the top end of upper looper bracket O
to move upper looper O
back
or
forth for positioning the
clearance of
0.1
to 0.2 mm between the upper looper and the
lower looper at the time
of
their.
crossing or the clearance of O
to 0.2
mm
between upper looper O and the needle.
-19-
Results
of
Improper Adjustment
o
If
the upper looper has been
positioned
too
high,
an
excessive clearance will
be
produced between the upper
looper and the needle.
As
the
result, the upper looper thread
will
fail to catch the
needle
thread,
and
stitch
skipping
occurs.
o On the contrary, if the upper
looper has been positioned too
low, the needle point
will
hit the
looper,
causing
needle
breakage. Also the looper will
touch other component when
the presser foot goes up .
o Excessive clearance
will cause
stitch skipping.
o Insufficient clearance will cause
. the upper looper to come in
contact with the lower looper.
From the Library of Superior Sewing Machine & Supply LLC
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