−33 −
6) Installing position of the arm thread guides A and C
For arm thread guides A 1 and C 2, the aim is the position where the engraved marker line aligns with
the center of setscrew.
7) Adjustment value for reference in combination of main materials and threads
The reference values related to the thread tension of main materials and threads are as follows. Adjust
the sewing to the materials and threads making the reference values as standard.
* Bobbin thread tension is the tension when bobbin thread is pulled out from the top surface of the throat
plate in the direction of front side at 45˚.
* Thread take-up spring stroke is the drawing amount of thread from the start-up of the motion to the end
of the motion of the thread take-up spring.
* Thread take-up spring tension is the tension when the start-up section of the thread take-up spring
moves by 1 mm.
Engraved marker line aligns
with center of screw.
1
2
Cloth
Denim 14oz
Corduroy
Chinos
Count of thread
#8
#20
#30
Needle size
Nm150
Nm140
Nm110
Bobbin thread tension (N)
[Top surface of throat plate]
0.45 to 0.55
0.35 to 0.45
Thread take-up
spring stroke (mm)
6 to 8
Remarks
Thread take-up
spring tension (N)
0.15 to 0.25
,
,
,
,
,
,
,
,
,
,
,,
,
,
,
,
,
To Next Page
Loading...
Need help?
General
