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4. ADJUSTING THE SEWING MACHINE
4-1. Thread tension
❸
❹
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.
❺
B
A
❶
❷
A
B
4-1-1. Adjusting the tension of thread tension
controller No. 1
Turn thread tension nut No. 1 ❶ clockwise A to
1)
shorten the length of thread remaining on the
top of needle after thread trimming. Turn the nut
counterclockwise B to lengthen it.
In the case the length of thread remaining at
the needle tip is not increased, change the
spring of tension controller No. 1 with the
separately-available spring (Part number:
22945505).
4-1-2. Adjusting the needle thread tension
(Active tension)
Active tension ❷ permits setting of the needle
thread tension on the operation panel according
to each sewing condition. In addition, the data
can be stored in memory.
1)
Press
tension input screen.
2)
Change the needle thread tension as de-
sired by pressing ❹ .
3)
There is a setting range of 0 to 200.
When the set value is increased, the tension
becomes higher.
*
When the set value is 36 at the time of stan-
dard delivery, the thread tension is adjusted
to 3.9 N (Tetoron thread #8). (Reference)
4-1-3. Adjusting the bobbin thread tension
Turn tension adjustment screw ❺ clockwise A to
increase the bobbin thread tension, or counterclock-
wise B to decrease it.
– 31 –
❸ to display the needle thread
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