– 13 –
(1) Changing the stroke of thread take-up
spring
❶
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 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.
(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
.
18. Thread tension
19. Thread take-up spring
20. 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.
❶
❷
❸
❹
❺
❶
B
A
❶
C
B
A
A
B
C
D
E
F
❶
❷
❸
