Adjustment Procedures
Results of Improper Adjustment
1) Returning amount
of
the lower looper
o Excessive return of the lower
CD
Loosen setscrew • of lower looper support arm 8
and
adjust
looper
tends
to
cause· stitch
lower looper 8 to make adjustment of the returning amount.
skipping when filament thread is
(Referential information)
used.
1. Radius 8 of lower looper 8 will
be
66.9
mm
when the lower
o Insufficient return of the lower
looper is inserted into lower looper support arm O until it
looper tends to cause needle
contacts with stopper pin O and then is fixed.
thread
stitch
skipping
when
2. The rocking angle
of
the lower looper will
be
2s·.
spun thread is used.
(M0-66665,
R)
The rocking angle of the lower looper will
be
32·.
(M0-6966G,
J)
2) Clearance between the lower looper and
the
needle
o Excessive clearance will often
MO-6700S Series
cause
needle
thread
stitch
CD
Loosen setscrew 8 of lower looper support arm O to the extent
skipping.
that it is temporarily tightened. Now, make the adjustment by
o Insufficient clearance will cause
moving lower looper support arm 8 back and forth.
needle
breakage
due
to
the
MO-6900S,
R,
G,
J Series.
contact of the looper with
the
CD
Loosen setscrew 8 of lower looper support arm 8 to the extent
needle,
or
produce scratches on
that it
is
temporarily tightened. Then finely adjust the longitudinal
the blade point of the looper.
position of the looper using fine adjustment screw O.
leading
to
needle
thread
® Turn fine adjustment screw 8 clockwise to move lower looper
breakage
or
other troubles.
G away from the needle.
Tum the screw counterclockwise to move lower looper 8 closer
to
it.
-13-
From the Library of Superior Sewing Machine & Supply LLC
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