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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 fingers with the knife.
4
3
F
2
1
120
(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.
2
5
Cau tion
1
(2) Adjusting the thread take-up spring
1) To change the tension of the thread take-up spring, firmly tighten
the screw 1 which fastens the tension post socket to the machine
3
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.
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
1
Increase
Decrease
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
between 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 has been
consumed. 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).
Turn it clockwise to increase.
Turn it counterclockwise to decrease.
(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.
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