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A
Standard clearance
(3)
(4)
B
A
c
®
D
""'L'-+--- E
(2)Adjusting the tension of needle thread
CDAdjust the pressure on the thread tension disc Adjust
the pressure on thread tension disc to change the tension
of needle thread. As Fig.(2), turn the nut(a)clockwise to
increase the pressure, contrary, to decrease the pressure.
@Adjust the tension of thread take-up spring
Thin material
20g
Common material
25g
Heavy material
30g
The method of adjusting:
loosen the nut A, tlml the thread take-up spring shaft
counter clockwise to increase the tension. Turn it clock-
sise to decrease the tension.
@The swing range of thread take-up spring
The thread take-up spring need to be able to swing when
the thread take-up lever is at its highest position.
The normal swing range of the thread take-up spring
should be:
Thin material
over 8mm
Common material
about 8mm
I-Ieavy material
less
8mm
The method of adjusting swing range
CD loosen the presser foot lever;
@ loosen the screw A;
@ Turn the thread take-up spring position disc B
counter clockwise to increase the swing range, contrary,
the swing range decrease.
@Tighten the screw A.
-6-
16. Winding the bobbin thread and
adjustment (Fig. 13)
The bobbin thread should be neat and tight. If the thread
is weak, please enlarge the pressure of the big thread
tension disc A. If the tIn'ead is not neat, please move the
bracket to adjust it. Firstly, lossen the screw B, if the
thread is wound to one side as Fig.(2); please move the
bracket rightward; if it is as Fig.(3), please move the
bracket leftward. Move the bracket until the thread is
wound neatly as Fig.(l), then tighten the screw.
Note: Nylon or polyester thread should be wound with
light tension in particular, otherwise the bobbin D might
be broken or deformed. Don't overfill the bobbin
thread ,because it makes thread loosen down from the
bobbin. The ?ptimum capacity of bobbin thread is fill
about 80% of bobbin outside diameter, and this can be
adjusted by screw(E).
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