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4-5. Corrective measure against idling of the bobbin
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
❷
4-6. Adjusting the air flow for the remaining thread guide
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
Speed controller
Thick thread can be guided more smoothly by opening the speed controller since the air
flow is increased by opening it. However, thin thread will be likely to flop when the air flow
is excessively increased.
Thin thread can be guided more smoothly by closing the speed controller since the air flow
is decreased by closing it. However, thick thread will be likely not to be guided smoothly.
❸
18.5 mm
❶
Remaining thread
guide solenoid valve
– 42 –
If a sewing trouble occurs due to frequent idling of
bobbin when performing thread trimming, loosen
screw ❸ and adjust the initial position of moving
knife ❷ .
According to the initial value representing the ini-
tial position of moving knife, the distance from the
top end of throat plate to the top end of moving
knife link ❶ is 18.5 mm. Change the initial value
to a value between 17.5 and 18mm.
If the distance from the top end of
throat plate to the top end of moving
knife link ❶ is increased excessively,
the needle thread and bobbin thread
sometimes cannot be trimmed at a
time.
The initial adjustment value of the speed controller
has been adjusted to the value which is obtained
by turning it in the reverse direction by seven rev-
olutions from the fully-opened position.
If the remaining thread removal is not carried out
stably according to the type and count of thread,
finely adjust the speed controller.
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