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4. ADJUSTING THE SEWING MACHINE
4-1. Adjusting the thread tension
WARNING :
In case of thread-breakage, it may occur that the thread tangles on the thread take-up lever. In such
a case, turn the power off, raise the thread take-up cover and remove the thread which has twined
around the thread take-up. At this time, be extremely careful to protect your hand from being cut by
the knife.
F
3. Thread tension disc felt ❺ is a consumable part.
When rotary disc ❸ slips, there is a possibility that the thread tension disc felt has been con-
sumed. Replace the felt with new one (Part No. : 22528509 x 4 pcs.).
4. When thick thread (approximately #30 or lower) is used for needle thread, thread tension is apt
to be insufficient with the rotary tension controller of the standard delivery. In this case, use the
optional thread tension disk asm. (part No. : 40017095).
❷
❷
❹
❸
❺
❶
❸
❶
❶
– 12 –
(1) Adjusting the needle thread tension
1)
Adjust the needle thread tension using the tension
nut ❶.
Turning the tension nut clockwise increases the
needle thread tension, or counterclockwise de-
creases it.
1. If the thread tension of pre-tension ❷ is
too low, the thread may slip out of rotary
disc ❸. Adjust the thread tension of the
pre-tension, using pre-tension adjusting
nut ❹ taking care of tension balance be-
tween the pre-tension and the rotary disc.
2. When setting the needle thread tension,
draw the thread in the direction F to
check that rotary disc ❸ smoothly rotates
with no slippage.
If the rotary disk slips, tighten pretension
adjusting nut ❹.
(2) Adjusting the thread take-up spring
1)
To change the tension of the thread take-up
spring, firmly tighten the screw ❶ which fastens
the tension post socket to the machine arm and
insert the blade of a screwdriver into the slot in
the tension post ❷ to adjust the tension of the
thread take-up spring.
Turn it clockwise to increase.
Turn it counterclockwise to decrease.
2)
To change the amount of thread taken by the
thread take-up spring, loosen the clamping screw
❶ of the tension post socket and turn the tension
post socket ❸.
Adjustable range of the amount of thread taken
by the thread take-up spring : 6 to 10 mm
(3) Adjusting the bobbin thread tension
1)
The tension of the bobbin thread is adjusted by
turning the tension adjusting screw ❶.
Turn it clockwise to increase.
Turn it counterclockwise to decrease.
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