−10 −
Ⅰ . Standard of the lower dead point of the needle bar
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring needle bar ① to the lower dead
point of its stroke.
3. Loosen the setscrew in the face plate to remove the face
plate.
4. Loosen setscrew ② in the needle bar connection.
At this time, loosen the setscrew to such an extent that the
needle bar moves up or down by hand since the needle bar
drops if the setscrew is fully loosened.
5. Adjust the distance from the lower end of the needle bar frame
to the lower end of the needle bar to the dimension A, and
tighten the setscrew.
(For the LU-1510-7, there is an engraved marker line on the
needle bar.)
Ⅱ . Needle-to-blade point of hook timing
1. Set the stitch dial to “0” mm.
2. Turn the handwheel and loosen setscrew ② in the needle
bar connection to adjust so that a clearance of 1.5 mm is
provided between the top end of the needle eyelet of needle
⑥ and blade point ⑦ of the hook when needle bar ① is raised
by 2.3 mm from the lower dead point of its stroke. Then, tighten
the setscrew again.
(For the LU-1510-7, there is an engraved marker line on the
needle bar.)
3. Turn the handwheel to make the needle bar ascend by 2.3
mm from the lower dead point of its stroke. Loosen two
setscrews ③ in the screw gear (small) so that blade point ⑦
of the hook is almost aligned with the center of needle ⑥ .
For the LU-1508H, however, 2.5 ± 0.3 mm instead of 2.3 mm
is applied.
4. Loosen setscrew ④ in the hook shaft saddle and move the
hook shaft saddle to the right or left until a clearance of 0.05
to 0.15 mm is provided between the blade point of the hook
and the needle at the position where blade point ⑦ of the
hook is almost aligned with the center of needle ⑥. After the
adjustment, tighten the setscrew.
5. Loosen two setscrews ⑤ in the screw gear (large) and move
the screw gear (large) to the right or left until blade point ⑦ of
the hook is aligned with the center of needle ⑥ . After the
adjustment, tighten the setscrews.
6. Set the stitch dial at the maximum and check that the needle
and the blade point of the hook do not come in contact with
each other.
Ⅲ . Adjusting the hook needle guard
1. Bend hook needle guard ⑧ to adjust so that the hook needle
guard pushes the side face of the needle to lean the needle
by 0.1 to 0.2 mm away from its straight position.
(Caution) • After tightening the screw gears of the hook
shaft, check that there is no thrust play in the
hook shaft.
• Check that there is a backlash in the screw
gears of the hook shaft.
Adjustment Procedures Results of Improper Adjustment
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