Adjusting The Thread Take-Up Spring And The Thread Take-Up Stroke - JUKI DDL-9000B Instruction Manual

14. ADJUSTING THE THREAD TAKE-UP SPRING AND THE THREAD TAKE-UP STROKE

4
5
1
E
F
G
H
(1) Adjusting the stroke of thread take-up spring 1
1) Loosen setscrew 2 .
Turn tension post 3 clockwise (in direction A), the stroke of the thread take-up spring will be increased,
2)
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 .
Turn tension post 3 clockwise (in direction A), the pressure will be increased, and turn the post 3 counter­
3)
clockwise (in direction B), the pressure will be decreased.
* 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 adjust-
ed 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]
C D
9
8
6
1
A
3
B
2
– 12 –
[DDL-9000B-SH]
8
9
6
1
A
3
B
2