JUKI DLN-6390 - Thread Tension Adjustment

25
ENGLISH
(1) Adjusting the needle thread tension
＊
1) and 2) are for DLN-6390-7 only.
1) As you turn thread tension No. 1 nut
1
clockwise (in
direction
A
), the thread remaining on the needle after
thread trimming will be shorter.
2) As you turn nut
1
counterclockwise (in direction
B
),
the thread length will be longer.
＊
Adjust so that the length of the thread remaining on the
needle should be 45 to 50 mm within the range where
the thread between the thread tension No. 1
1
and the
thread tension
2
does not move violently.
3) As you turn thread tension nut
2
clockwise (in direction
C
), the needle thread tension will be increased.
4) As you turn nut
2
counterclockwise (in direction
D
),
the needle thread tension will be decreased.
(2) Adjusting the bobbin thread tension
1) As you turn tension adjust screw
3
clockwise (in direction
E
), the bobbin thread tension will be increased.
2) As you turn screw
3
counterclockwise (in direction
F
),
the bobbin thread tension will be decreased.
＊
Commendable value of bobbin thread tension is 0.2N.
1
C
2
D
A
B
F
3
E
(1) Changing the stroke of thread take-up spring
1
1) Loosen setscrew
2
.
2) As you turn tension post
3
clockwise (in direction
A
), the stroke of the thread take-up spring will be
increased.
3) As you turn the knob counterclockwise (in direction
B
),
the stroke will be decreased.
(2) Changing the pressure of thread take-up spring
1
1) Loosen setscrew
2
, and remove thread tension (asm.)
5
.
2) Loosen setscrew
4
.
3) As you turn tension post
3
clockwise (in direction
A
),
the pressure will be increased.
4) As you turn the tension post
3
counterclockwise (in
direction
B
), the pressure will be decreased.
1) When sewing heavy-weight materials, move thread
guide
1
to the left (in direction
A
) to increase the
length of thread pulled out by the thread take-up.
2) When sewing light-weight materials, move thread guide
1
to the right (in direction
B
) to decrease the length of
thread pulled out by the thread take-up.
3) Normally, thread guide
1
is positioned in a way that
marker line
C
is aligned with the center of the screw.
7. Theead take-up spring
8. Adjusting the thread take-up stroke
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.
6. Thread tension
45 to 50 mm
1
5
4
3
2
1
A
B
1
A B
C