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THREAD TENSION
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* Adjusting the thread tension for purl stitch:
1. Adjust the bobbin thread tension to approx. 15 to
20g
by adjusting scr
ew
O
of
the bobbin case.
2.
Adjust
tension controller No. 18 for proper ne
ed
le thread tension
so
that
the bar-tack
part
is formed by
well-shaped whip stitches
If
the tension
is
too l
ow
bar tacking seam may form thre
ad
knots on the rear face
offabdc.
3.
Adjust tension
co
ntroll
er
No. 2
@)
for
proper
tension
of
the paUar
e]
side
seams by
judging
fr
om
the stitch
formation.
* Adjusting the thread tension for whip stitch:
I. Adjust the bobbin thread tension to approx
40
to
50g
by adjusting screw 0
of
the bobbin case.
2. Exchange the adjusting springs
of
tension controllers No.I 8 and No.2
@)
each other
(t
he tension contro
ll
er
No.2 will have a weak
sp
ring).
3.
Adjust tension
co
ntroller No.2
@)
to prevent ravelling
off
at the end
of
a seam.
4.
The
stitches
of
the parallel sides
or
bar-tack can
be
adjusted by tension contro
ll
er
No. 18 .
*
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From the library of: Superior Sewing Machine & Supply LLC
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