Adjusting The Stitch Length - JUKI DDL-9000B Instruction Manual

13. ADJUSTING THE STITCH LENGTH

* The dial calibration is in millimeters.
1) Turn stitch length dial 1 in the direction of the arrow, and align the desired number to marker dot A on the machine arm.
2) When you want to decrease the stitch length, turn stitch length dial 1 while pressing feed lever 2 in the direction of the arrow.
3) If the stopper 3 is turned in the arrow B direction, the stitch length dial 1 will be fixed.
4) If the stitch length dial 1 is not to be fixed, turn the stopper 3 in the arrow C direction and leave it in that state.
14. ADJUSTING THE THREAD TAKE-UP SPRING AND THE THREAD TAKE-UP STROKE
5
1
F
G
H
(1) Adjusting the stroke of thread take-up spring 1
1) Loosen setscrew 2 .
2) Turn tension post 3 clockwise (in direction A), the stroke of the thread take-up spring will be increased, and turn the post 3 counterclockwise (in direction B),
the stroke will be decreased.
(2) Adjusting the pressure of thread take-up spring 1
1) Loosen setscrew 2 , and remove thread tension (asm.) 5 .
2) Loosen tension post setscrew 4 .
3) Turn tension post 3 clockwise (in direction A), the pressure will be increased, and turn the post 3 counterclockwise (in direction B), the pressure will be de-
creased.
* Standard state of the thread take-up spring
The engraved marker line 6 on the machine arm is almost aligned with the top of thread take-up spring.
(It is necessary to adjust in accordance with materials and processes.)
(Caution) For the Model DDL-9000B- DS, the fully-dry hook is adopted. Comparing with the sewing machine using the existing hook, the sewing machine
tends to be affected by the adjustment of the thread take-up spring. If the thread take-up spring does not work sufficiently, thread running increases. As a
result, thread breakage, balloon stitching, etc. may occur.
To check how the thread take-up spring works, draw out the needle thread in direction F after having adjusted the thread take-up spring pressure
to check whether the thread take-up spring exerts force to the thread up to the last moment (state G) just before the thread comes out from E. If the
spring fails to exert force to the spring until the last moment (state H), decrease the thread take-up spring pressure. In addition, the stroke of the
thread take-up spring is excessively small, the spring does not work properly.
For the general fabrics, a stroke of 10 to 13 mm is proper.
(3) Adjusting The Thread Take-up Stroke
1) When sewing heavy-weight materials, move thread guide 8 to the left (in direction C) to increase the length of thread pulled out by the thread take-up.
2) When sewing light-weight materials, move thread guide 8 to the right (in direction D) to decrease the length of thread pulled out by the thread take-up.
* Standard state of the thread guide
・ - S, -MA: Marker line 9 on the thread guide aligns with the center of the setscrew.
・ -SH: Marker line 9 on the thread guide aligns with the center of the marker line on the machine arm.
[DDL-9000B- S, -MA]
4
9
8
6
E
A
B
1
2
C D
1
3
2
– 6 –
A
C
B
3
[DDL-9000B-SH]
8
9
6
1
A
3
B
2