– 13 –
1. Hold the bobbin so that it turns to the right and insert it in the bobbin
case. (See Drawing.)
2. Pass the thread through the threading port
A
of the bobbin case.
When the thread is pulled in the direction of
C
, it can be pulled
toward the threading port
B
passing beneath the thread tension
spring.
3. Examine if the bobbin turns in the direction of the arrow when the
bobbin thread is pulled.
Part name
MS, SS
DS
SH
MA
Bobbin case
22896252
40000264
40000264
11038700
Bobbin
D1837555
BAAA
D1837555
BOBA
40091141
(Made of aluminum)
B9117012000
(Made of iron)
About the standard part numbers (DDL-9000B-
)
1) Bobbin case with idling prevention spring
The DDL-9000B Series employs the bobbin case with an idling prevention spring.
Adjustments of idling prevention spring tension can be carried out in the procedures below.
If bobbin idling occurs, increase the idling prevention spring tension
When the bobbin runs idle
Increase the tension of the idle-prevention spring.
When the thread is not well tightened
Decrease the tension of the idle-prevention spring.
* Adjustment of idling prevention spring tension
(1) Insert an old needle as illustrated and remove the spring by lifting it up.
(Suggestion: Use the thumb to prevent the spring from popping out.)
(2) The spring tension can be changed by changing the height of the arch-shaped section of the spring.
(Make sure not to permit the free end of the spring to come out of the bobbin case.)
(3) Firstly, set the ear
and insert the needle. Then, settle the ear
is the state that the center part of the
spring is lifted.
(4) When a bobbin case with an idling prevention spring is used, it should be inserted in the winding direction
as illustrated.
(Unevenness in sewing at high or low speed)
When sewing seems to be too tight
Adjust the bobbin thread tension and the idling
at low speed:
prevention spring tension to be strengthened.
When sewing seems to be too weak
Adjust the bobbin thread tension and the idling prevention
at low speed:
spring tension to be weakened.
* If there is a problem of bobbin idling or uneven sewing at high or low speed, use of a bobbin case with an
idling prevention spring is effective.
o If the direction of clockwise wind-
ing is adopted, variation is less-
ened possibly caused by a change
in the amount of bobbin thread.
Adjustment Procedure
Results of Improper Adjustment
Bobbin case with idling
prevention spring
40091141
(Made of aluminum)
Summary of Contents for DDL-9000B-DS
Page 14: ... 10 4 Feed locus and phase 1 Timing standard 2 Timing fast 3 Timing slow Standard Adjustment ...
Page 32: ... 28 8 Adjustment of the amount of feeding 4 Optional switch Standard Adjustment ...
Page 58: ... 54 11 Thread trimming unit 8 Replacement of the moving knife Standard Adjustment ...
Page 70: ... 66 12 Adjustment of the wiper DDL 9000B WB 2mm 1mm Standard Adjustment ...
Page 112: ...MEMO ...
