Thread Tension; Theead Take-Up Spring; Adjusting The Thread Take-Up Stroke - JUKI DLN-6390 Manuel D'utilisation

6. Thread tension

1
B
A
2
C
D

7. Theead take-up spring

1
A
B
3

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.
A B
(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
2) As you turn nut 1 counterclockwise (in direction B ),
E F
＊ Adjust so that the length of the thread remaining on the
3
3) As you turn thread tension nut 2 clockwise (in direction
4) As you turn nut 2 counterclockwise (in direction D ),
45 to 50 mm
(2) Adjusting the bobbin thread tension
1) As you turn tension adjust screw 3 clockwise (in direction
2) As you turn screw 3 counterclockwise (in direction F ),
＊ Commendable value of bobbin thread tension is 0.2N.
(1) Changing the stroke of thread take-up spring 1
1) Loosen setscrew 2 .
2) As you turn tension post 3 clockwise (in direction
5 4
3) As you turn the knob counterclockwise (in direction B ),
(2) Changing the pressure of thread take-up spring 1
1) Loosen setscrew 2 , and remove thread tension (asm.) 5 .
2
1
2) Loosen setscrew 4 .
3) As you turn tension post 3 clockwise (in direction A ),
4) As you turn the tension post 3 counterclockwise (in
1) When sewing heavy-weight materials, move thread
1
2) When sewing light-weight materials, move thread guide
C
3) Normally, thread guide 1 is positioned in a way that
– 25 –
direction A ), the thread remaining on the needle after
thread trimming will be shorter.
the thread length will be longer.
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.
C ), the needle thread tension will be increased.
the needle thread tension will be decreased.
E ), the bobbin thread tension will be increased.
the bobbin thread tension will be decreased.
A ), the stroke of the thread take-up spring will be
increased.
the stroke will be decreased.
the pressure will be increased.
direction B ), the pressure will be decreased.
guide 1 to the left (in direction A ) to increase the
length of thread pulled out by the thread take-up.
1 to the right (in direction B ) to decrease the length of
thread pulled out by the thread take-up.
marker line C is aligned with the center of the screw.