JUKI IT-100D - Sewing; Adjusting the Thread Tension

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(3) Adjusting the bobbin thread tension
1) The tension of the bobbin thread is adjusted by
turning the tension adjusting screw
1
.
Turn it clockwise to increase.
Turn it counterclockwise to decrease.
(1) Adjusting the needle thread tension
1) Adjust the needle thread tension using the tension nut
1
.
Turning the tension nut clockwise increases the needle thread
tension, or counterclockwise decreases it.
1. If the thread tension of pre-tension
2
is too low,
the thread may slip out of rotary disc
3
. Adjust the
thread tension of the pre-tension, using pre-tension
adjusting nut
4
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
3
smoothly rotates with no slippage. When the rotary
disc slips, tighten pre-tension adjusting nut
4
.
3. Thread tension disc felt
5
is a consumable part.
When rotary disc
3
slips, there is a possibility that
the thread tension disc felt
5
has been consumed.
Replace the felt with new one (Part No. : 22528509
x 4 pcs.).
(2) Adjusting the thread take-up spring
1) To change the tension of the thread take-up spring, rmly tighten
the screw
1
which fastens the tension post socket to the ma
-
chine arm and insert the blade of a screwdriver into the slot in
the tension post
2
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
1
of the tension post socket
and turn the tension post socket
3
.
Adjustable range of the amount of thread taken by the thread
take-up spring : 6 to 10 mm
F
2
4
3
1
2
3
1
Increase
Decrease
1
7. SEWING
7-1. Adjusting the thread tension
WArNING :
In case of thread-breakage. It may occur that the thread tangles on the thread take-up lever. In this
case, remove the thread tangling around the thread take-up lever by raising the thread take-up cover.
At this time, be careful not to cut your ngers with the knife.
5