−
40
−
(2)
(B)
0.04 to 0.1 mm
3-35 Points of adjuting the sewing
Adjusting the needle and the hook
Align hook blade point (1) with the center of needle (2) when the needle bar goes up from its lowest poisition and
the lower end of the needle bar metal is aligned with marker line B on the needle bar.
At this time, the standard clearance between the needle and the hook blade point is approximately 0.04 to 0.1
mm.
*
If the clearance between the hook blade point and the needle is smaller than the specified value, the hook
blade point is damaged resulting in thread breakage.
*
When the needle No. is changed, be sure to check the clearance between the hook blade point and the
needle.
*
If the clearance is especially smaller than the specified value, the lower part of the hook blade point comes
near to the needle when the hook slightly advances. Check whether there is a contact in this section.
*
Adjust the needle with its indented part facing exactly to the horizontal direction. For the synthetic thread, the
direction of attaching the needle is better for thread trimming when the indented part is faced slightly to the
rear.
When the indented part faces to this side is likely to affect the sewing adversely.
Reference for adjustment value of the thread tension
*
Main materials and threads are described. Based on the reference value, adjust the thread tension in accordance
with materials and threads.
*
Bobbin thread tension is the tension when pulling thread to this side in the direction of 45˚ from the top surface
of the throat plate.
*
Thread take-up spring stroke is the amount of thread take-up from the start to the end of spring movement.
*
Thread take-up spring tension is the tension when the spring moves 0 to 1 mm at the start of movement.
Cloth
Thread
Needle
Pitch (mm)
T/C broad
Tetron #80
DBX1#11
2
0.2 to 0.4
0.15 to 0.25
12 to 15
0.06 to 0.1
Woolen gabardine
Tetron #50
DBX1#11
2.5
0.3 to 0.7
0.15 to 0.25
10 to 16
0.1 to 0.15
Coat cloth
Tetron #30
DBX1#14
3
0.6 to 1.4
0.25 to 0.35
10 to 16
0.15 to 0.2
Cotton gabardine
Spun #60
DBX1#14
2.5
0.4 to 1.3
0.2 to 0.3
10 to 16
0.1 to 0.15
Cotton gabardine
Spun #80
DBX1#11
2
0.4 to 1.0
0.15 to 0.25
10 to 16
0.1 to 0.15
Comber broad
Spun #80
DBX1#11
2
0.4 to 1.0
0.15 to 0.25
10 to 16
0.1 to 0.15
T/C broad
Spun #80
DBX1#11
2
0.4 to 0.9
0.15 to 0.25
10 to 16
0.1 to 0.15
T/C broad
Tetron #60
DBX1#11
2
0.3 to 0.6
0.15 to 0.25
12 to 15
0.06 to 0.4
Needle thread
t e n s i o n ( N )
[ R e f e r e n c e
value]
Bobbin thread
tension (N) (Top
surface of throat
plate) (Aim)
Thread take-up
s p r i n g s t r o k e
(mm) (Aim)
T h r e a d t a k e - u p
spring tension (N)
(Aim)
(1)
