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20. Thread tension controller
[Checking items]
* Using Saba C 120, check that the thread tensions are the nu-
meric values shown below. (Scale mark on the knob "4")
Turn up the knob to the scale mark on “9” and then return to
the scale mark on “4” to check the thread tensions.
• Left-hand needle thread ------- 0.29 ± 0.05 N (30 ± 5 g)
• Right-hand needle thread ----- 0.14 ± 0.03 N (14 ± 3 g)
• Upper looper thread ------------ 0.12 ± 0.02 N (12 ± 2 g)
• Lower looper thread ------------ 0.24 ± 0.03 N (24 ± 3 g)
[How to perform adjustment]
(For example) when you want to strengthen a standard thread
tension,
○ When you want to strengthen the thread tension by the
amount of
A
, move the knob to its position.
○ Insert the small-screwdriver into the thread tension controller
from the thread path slot (slit) of the front cover and put it on
the shelf
1
inside the front cover.
○ Push the ange part
2
of the thread tension pulley in the
direction of the arrow using the tip of the small-screwdriver
and release the engagement of the thread tension drive gear
3
with the intermediate gear
4
.
○ In this state, return the knob to the standard scale mark on “4.”
○ When you stop pushing the small-screwdriver, the thread
tension drive gear
3
engages with the intermediate gear
4
in the original state.
(Caution) After you stop pushing the small-screwdriver,
check that they engage with each other properly
by moving the thread tension knob up and down
just slightly.
5
4
3
2
1
A
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