– 24 –
(1) Adjusting the needle thread tension
1) Turn thread tension nut No. 1
❶
clockwise
A
to
shorten the length of thread remaining on the
top of needle after thread trimming. Turn the nut
counterclockwise
B
to lengthen it.
2) Turn thread tension nut No. 2
❷
clockwise
C
to
increase the needle thread tension, or counter-
clockwise
D
to decrease it.
Apply the same tension to both of the
thread tension nut No. 2.
In the case, the length of thread remaining
at the needle tip cannot be increased, re-
place the spring of tension controller No. 1
with 22945505 which is separately available.
(2)
Adjusting the bobbin thread tension
Turn tension adjustment screw
❸
clockwise
A
to
increase the bobbin thread tension, or counterclock-
wise
B
to decrease it.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶
❷
B A
C
D
❸
B
A
4-2. Thread tension
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