I
Photo
23
21.
Proper
Position
ol
Knife
Holder
The
knife
holder
is
set
in
such
a
monner
that
there
will
be
a
clearance
of
between
the knife
and
the
needle
irregardless
of
the length
of
button
hole, and
that
the buttonhole will be cut open all the
way
to the bars.
If, in spite of the above, the knife should injure a bar, the knife holder must
be adjusted
after
loosening set screws c and d (Photo
17).
22.
The
Needle
Thread
Trimmer
When depressing the left treadle after
finishing
the buttonhole, the needle
thread Is automatically trapped by the trapper spring, which is mounted
on the needle
thread
trimmer,
and
is cut on the top surface of the button
hole
before
the
work
clamp
is
raised.
When re-starting the machine for the next buttonhole, the needle thread
trimmer
first
is
moved
back
and
then
to
the
left
so
that
the
needle
can
stitch
across
the
loose
end
of
thread.
After tacking the end, both the trimmer and the trapper spring open and
release
the
thread
so
that
it
may
be completely covered by the first
parallel of the next buttonhole.
27
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