Then
retain
the
thread
in
front
of the tip
of
the tension spring with the
forefinger of
yo-ur
left hand until the thread is pulled back into slot 3,
through the
gap
between the bobbin case and the bobbin, and through slot
4
into
the
delivery
eye
5.
When letting go of the
thread
and
pulling it through the delivery
eye,
it
will properly snap under the tension spring and be visible through
aper
ture
6
(Photo
4).
While holding the latch open, the bobbin
case
cap
and
the bobbin
ore
push
ed
onto
the
center
stud
in
the
bobbin
case
base
and
the
latch
is
closed.
A slight pressure exerted with the thumb will make the cap snap into posi
tion audibly. This is very important since an improperly inserted bobbin icase
may cause
damage
to the hook, the bobbin
case
or the needle.
Photo
13
Photo
14
9. Regulating the Bobbin Thread Tension
The bobbin thread tension is regulated by means of screw z (Photo
15).
Tightening
this
screw
will
increase
the
tension,-
and
loosening
it
wi-Ii
decrease
it.
Purlstitch buttonholes of any description require a very weak bobbin thread
tension.
The
tension
is properly regulated if the bobbin case
will
slowly
slide down
by its own weight when letting it hang on the threod.
(Photo
16).
On no
account
should the
bobbin
thread
tension be
increased
in
excess
of
the
15
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