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Adjustment Procedure
1) Loosen the setscrew of upper looper ball arm
the upper looper holder.
2) Adjust the clearances between upper looper bracket
looper holder
to approximately 0.2 mm respectively, and tighten
setscrew
of the upper looper holder.
(Make sure that the upper looper holder smoothly moves together
with upper looper shaft
3) Then determine dimension
the top surface of upper looper holder pin
setscrew of upper looper ball arm
(Caution) Replace upper looper holder
gauge size.
.)
from the bottom surface of the frame to
F
before tightening the
.
according to the needle
– 13 –
Results of Improper Adjustment
o Inaccurately positioned upper
and setscrew
of
and upper
(Caution) To adjust the upper
l o o p e r h o l d e r w i l l c a u s e
excessive projection of the upper
l o o p e r , r e s u l t i n g i n s t i t c h
skipping, or contact.
looper ball arm, take
dimension
F F F F F
dard.
Remember that the
projecting amount
and the height of the
upper looper should
eventually be prop-
erly adjusted. So,
confirm the dimen-
sions related to the
upper looper.
as stan-
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