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1) Loosen the setscrew of upper looper ball arm and setscrew of
the upper looper holder.
2) Adjust the clearances between upper looper bracket and upper
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
F
from the bottom surface of the frame to
the top surface of upper looper holder pin before tightening the
setscrew of upper looper ball arm .
(Caution) Replace upper looper holder according to the needle
gauge size.
o Inaccurately positioned upper
looper holder will cause
excessive projection of the upper
looper, resulting in stitch
skipping, or contact.
(Caution) To adjust the upper
looper ball arm, take
dimension
FF
FF
F
as stan-
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.
Adjustment Procedure Results of Improper Adjustment
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