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5. Adjusting the bobbin thread tension
Adjust the bobbin thread tension as given below when the bobbin thread is pulled up at the position where
thread slit ❶ of bobbin case comes up.
Purl stitch
0.05 to 0.15N
Whip stitch
0.15 to 0.3N
Turning tension adjust screw ❷ clockwise will increase bobbin thread tension, and turning it counterclock-
wise will decrease the tension.
Adjust the bobbin thread tension to lower for synthetic filament thread, and to higher for spun thread. The
thread tension is higher by approximately 0.05N when the bobbin case is set to the hook since idle-pre-
vention spring is provided.
When bobbin thread tension is adjusted, check the needle thread tension setting of the
memory switch. (Refer to
6. Installation of bobbin case
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
❶
❷
❶
To such an extent that bobbin case quietly comes down when holding
thread end coming from bobbin case and shaking it quietly up and down.
To such an extent that bobbin case barely comes down when holding
thread end coming from bobbin case and shaking it somewhat strongly.
"V-22. Memory switch data list"
1) Lift up and hold bobbin case latch lever between
two fingers.
2) Push the bobbin case into the hook so that it is
supported by the hook shaft ❶ and then snap in
the latch lever.
Press the bobbin case until the predetermined
position is reached, and it will click.
– 18 –
p.56.)
1. If the bobbin case is out of the pre-
determined position, it can jump out
from the hook to cause the needle
thread to tangle on the hook shaft.
Check to be sure that the bobbin
case is properly installed in the cor-
rect position.
2. There is a difference in the shape of
bobbin case between the standard
hook and the dry one. They have
nothing in common with each other.
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