Installing Position Of The Hook - JUKI DLN-6390 Instruction Manual

2. Installing position of the hook

WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❷
B
❺
❼
b
❷
C



❾
a
❶
❹
❸
❺
❻
D
E

0 to 0.06 mm
❽
b
– 27 –
1) Remove setscrews ❶ and remove throat plate ❷ .
2) Remove cap ❸ and put a screwdriver from hole ❹ to
loosen three hook setscrews. Turn the handwheel in
the direction where needle bar goes up, set gauge for
the height of needle bar ❺ supplied as accessories to
installing plane ❻ of the throat plate as shown in the
figure, and adjust the position so that plane B (section
B of engraved marker) of gauge for the height of nee-
dle bar ❺ enters bottom end ❼ of the needle bar.
3) In this state, adjust blade point ❽ of hook a to the
center of needle ❾ . Then adjust so that the clearance
provided between the needle and the hook is 0 to 0.06
mm (standard) and securely tighten three hook set-
screws.
(Tightening torque : 2 to 4 N·m)
＊ At this time, adjust inner hook b at the position as
shown in the figure.
4) Install cap ❸ and throat plate ❷ , and securely tighten
setscrews ❶ .
(Tightening torque : 1.5 to 3 N·m)
＊ Adjust the convex of bobbin case holder  to the con-
cave of inner hook b when installing the throat plate.
＊ Tighten setscrews ❶ and install throat plate ❷ while
pushing throat plate ❷ by hand in the direction of ar-
row mark C when installing throat plate ❷ .
5) Adjust clearance D provided between the convex of
bobbin case holder and the concave of the inner hook
with gauge  supplied with the sewing machine as
accessories. (Standard : 0.8 mm)
＊ Put gauge  supplied as accessories in clearance D
and tighten setscrew  while lightly pushing bobbin
case holder  in the direction E.
(Tightening torque : 1.5 to 2.5 N·m)
＊ Check that the gauge  can go in clearance D and
come out from it with light resistance.