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20. Thread tension
B
D
21. Thread take-up spring
A
B
❸
22. Adjusting the thread take-up stroke
WARNING :
Be sure to turn the power OFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
C
A
F
E
❶
❸
C
❷
❺
❶
❷
❶
A
B
❶
(1) Adjusting the needle thread tension
1) The length of thread remaining at the needle tip
after thread trimming is shortened by turning ten-
sion regulating nut No. 1 ❶ clockwise in direction
A.
2) It is lengthened by turning the nut counterclock-
wise in direction B.
3) The needle thread tension is increased by turning
tension regulating nut No. 2 ❷ clockwise in direc-
tion C.
4) It is decreased by turning the nut counterclock-
wise in direction D.
(2) Adjusting the bobbin thread tension
1) The bobbin thread tension is increased by turning
tension regulating screw ❸ clockwise in direction
E.
2) It is decreased by turning the screw counterclock-
wise in direction F.
(1) Changing the stroke of thread take-up
spring ❶
❹
1) Loosen setscrew ❷.
2) As you turn tension post ❸ clockwise (in direc-
tion A), the stroke of the thread take-up spring
will be increased.
3) As you turn tension post ❸ counterclockwise (in
direction B), the stroke will be decreased.
(2) Changing the pressure of thread take-up
spring ❶
1) Loosen setscrew ❷, and remove thread tension
asm. ❺.
2) Loosen setscrew ❹.
3) As you turn tension post ❸ clockwise (in direc-
tion A), the pressure will be increased.
4) As you turn the tension post ❸ counterclockwise
(in direction B), the pressure will be decreased.
1) When sewing heavy-weight materials, move
thread guide ❶ to the left (in direction A) to
increase the length of thread pulled out by the
thread take-up.
2) When sewing light-weight materials, move thread
guide ❶ to the right (in direction B) to decrease
the length of thread pulled out by the thread take-
up.
3) Normally, thread guide ❶ is positioned in a way
that marker line C is aligned with the center of
the screw.
– 16 –
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