JUKI DDL-9000C-S Series, Инструкция по эксплуатации, Страница: 70 / 113

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7-1. Needle-to-hook relationship
7. ADJUSTMENT OF THE MACHINE HEAD (APPLICATION)
Adjust the timing between the needle and the hook
as follows :
1) Adjusting the needle bar height. Turn the hand-
wheel to bright the needle bar down to the lowest
point of its stroke, and loosen setscrew
❶ .
2) Adjusting the needle bar height. Align marker
line (For a DB needle : marker line A , For a DA
needle : marker line
C
) on needle bar
❷
with the
bottom end of needle bar lower bushing ❸ , then
tighten setscrew
❶
.
3) Position the needle and the hook a .
Loosen the three hook setscrews, turn the hand-
wheel in normal rotation and align marker line
(For a DB needle : marker line
B
, For a DA nee-
dle : marker line D ) on ascending needle bar ❷
with the bottom end of needle bar lower bushing
❸ .
4) In this state, align hook blade point
❺
with the
center of needle ❹ . Provide a clearance of 0.04
to 0.1 mm (reference value) between the needle
and the hook, then securely tighten the three hook
setscrews.
❶
B
❸
A
❷
C
D
A
B
a
0.04 to 0.1 mm
❹
❺
1. If the clearance between the blade
point of hook and the needle is
smaller than the specified value, the
blade point of hook will be damaged.
If the clearance is larger, stitch
skipping will result.
2. The needle bar of the DDL-9000C-
FMS is processed with special
black coating. In the case you find it
difficult to visually check the location
of marker lines, illuminate the needle
bar with a flashlight or the like to
make it easier.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.