JUKI LK-1900AN, Engineer'S Manual

Page: 31 / 140

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Adjustment procedures Results of Improper adjustment
1. Turn the pulley by hand. When needle bar
1
has gone up,
adjust so that lower marker line
2
engraved on the needle bar
aligns with the bottom end of the needle bar bushing lower
3
.
2. Loosen setscrew
4
in the driver
9
. Open inner hook pressers
5
to the right and left, and remove inner hook presser
6
.
(Caution) At this time be careful not to let inner hook
7
come
off and fall.
3. Adjust so that the blade point of inner hook
7
aligns with the
center of needle
8
, and that a clearance of 0 mm is provided
between the front end of the driver
9
and the needle
8
as the
front end face of driver
9
receives the needle
8
to prevent the
needle from being bent. Then tighten setscrew
4
of the driver
9
.
4. Loosen setscrew
!3
of the shuttle, and adjust the longitudinal
position of the shuttle. To do this adjustment, turn shuttle race
adjusting shaft
!0
clockwise or counterclockwise to provide a
0.05 to 0.1 mm clearance between needle
8
and the blade
point of inner hook
7
.
5. After adjusting the longitudinal position of the shuttle, further
adjust to provide a 7.5 mm clearance between the needle
8
and the shuttle by adjusting the rotating direction. Then tighten
setscrew
!3
of the shuttle.
(Caution) Apply a small amount of oil to race section
!1
and
oil wick
!2
, and use the sewing machine after an
extended period of disuse or cleaning the periphery
of hook portion.