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(2) Position of the needle and the inner hook holder
4-8. Adjusting the needle thread presser device
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
0.3 ～ 0.8mm
B
A
①
1) An axial clearance of 0.3 to 0.8 mm should be
provided between the projecting part of the inner
hook holder and the groove portion of the inner
hook.
2) The difference in height between the upper end
of the projecting part of the inner hook holder and
the upper end of the groove portion of the inner
hook should be 0 ± 0.4 mm.
3) The longitudinal position of the inner hook hold-
er should be screwed so that the needle entry is
shifted from the center of the projecting part to
the shoulder part of the inner hook holder on this
side.
[Adjusting the remaining length of needle thread]
Adjust the length of needle thread remaining at the
needle to 35 to 45 mm (for the S, H and J types) by
turning thread tension No. 1 nut ① .
1) Turn thread tension No. 1 nut ① clockwise (in di-
rection A), to shorten the thread length remaining
on the needle after thread trimming or counter-
clockwise (in direction B), to lengthen the thread
length.
So-called "bird's nest phenomenon"
is reduced by shortening the length of
needle thread remaining at the needle.
In this case, however, the needle thread
is likely to slip off the needle eyelet.
To reduce slip-off of the needle thread,
sewing speed at the beginning of sew-
ing should be reduced.
– 19 –
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