Adjustment Procedures
1) Loosen the setscrew of upper looper ball arm O and setscrew
0 of the upper looper holder.
2)
Adjust the clearances between upper looper bracket 8 and
upper looper holder
Oto
approximately 0.2
mm
respectively,
and tighten setscrew
O of the upper looper holder.
(Make sure that the upper looper holder smoothly moves
together with upper looper shaft
O.)
3)
Then determine dimension O from the bottom surface of the
frame to the top surface of upper looper holder pin
8 before
tightening the setscrew of upper looper ball arm
8.
(Caution) Replace upper looper holder 8 according to the
needle gauge size.
-17-
Results of Improper Adjustment
o Inaccurately positioned upper
looper
holder
will
cause
excessive
projection
of
the
upper looper, resulting in stitch
skipping,
or
other troubles.
(Caution) To adiust the upper
looper
ball
arm,
take
dimension
O
as
standard.
Remember that the projecting
amount and the
height of the
upper
looper
should
eventually
be
properly
adjusted.
So,
confirm
the
dimensions
related to
the
upper looper.
l'I
:1
!I
II
I
l'
11
I
From the Library of Superior Sewing Machine & Supply LLC
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