JUKI LK-1900B series - Page 35

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Adjustment procedures Results of Improper adjustment
1.Turnthepulleybyhand.Whenneedlebar
❶
hasgoneup,adjust
so that lower marker line
❷
engraved on the needle bar aligns
with the bottom end of the needle bar bushing lower
❸
.
2. Loosen setscrew
❹
in the driver
❾
. Open inner hook pressers
❺
to the right and left, and remove inner hook presser
❻
.
(Caution) At this time be careful not to let inner hook
❼
come
off and fall.
3.Adjustsothatthebladepointofinnerhook
❼
aligns with the
center of needle
❽
, and that a clearance of 0 mm is provided be-
tween the front end of the driver
❾
and the needle
❽
as the front
end face of driver
❾
receives the needle
❽
to prevent the needle
frombeingbent.Thentightensetscrew
❹
of the driver
❾
.
4. Loosen setscrew
󱢶
oftheshuttle,andadjustthelongitudinal
positionoftheshuttle.Todothisadjustment,turnshuttlerace
adjustingshaft
󱢳
clockwise or counterclockwise to provide a 0.05
to 0.1 mm clearance between needle
❽
and the blade point of
inner hook
❼
.
5.Afteradjustingthelongitudinalpositionoftheshuttle,further
adjusttoprovidea7.5mmclearancebetweentheneedle
❽
and
theshuttlebyadjustingtherotatingdirection.Thentightenset-
screw
󱢶
of the shuttle.
(Caution) Apply a small amount of oil to race section
󱢴
and oil
wick
󱢵
, and use the sewing machine after an extend-
ed period of disuse or cleaning the periphery of hook
portion.