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Adjustment Procedures Results of Improper Adjustment
1) Loosen the setscrew of upper looper ball arm 3 and setscrew
5 of the upper looper holder.
2) Adjust the clearances between upper looper bracket 4 and
upper looper holder 1 to approximately 0.2 mm respectively,
and tighten setscrew 5 of the upper looper holder.
(Make sure that the upper looper holder smoothly moves
together with upper looper shaft 6.)
3) Then determine dimension F from the bottom surface of the
frame to the top surface of upper looper holder pin 2 before
tightening the setscrew of upper looper ball arm 3.
(Caution) Replace upper looper holder 1 according to the
needle gauge size.
™ Inaccurately positioned upper
looper holder will cause
excessive projection of the
upper looper, resulting in stitch
skipping, or other troubles.
(Caution) To adjust the upper
looper ball arm, take
dimension F 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.
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