Bernina 732 Manual - Page 42

Automatic, Buttonhole, Sewing

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AUTOMATIC BUTTONHOLE SEWING There are three different kinds of buttonholes: a) The ordinary buttonhole. b) The buttonhole with cord inlay. c) The raised buttonhole. The ordinary buttonhole This is sewn with normal under thread tension, but with a special threading of the bobbin ease. The sewing of the buttonhole is effected without, turning the cloth around. This can be made either step by step, the machine being stopped after each operation, or in one working operation, i.e. without interrupting the various working stages. It will, however, be well to learn sewing buttonholes step by step; after a little time you will naturally be able to sew the whole buttonhole in one single working operation as well. Fig i0 The threading of the under thread: An increased tension of the under thread produces still better results when sewing buttonholes automatically. To get this higher bottom thread tension without changing the lower tension itself, which is correct for normal sewing, see fig. 50, a hole has been drilled through the finger of the bobbin case through which the under thread has to be 17 It record Fig. 51 19 \Ow 20

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AUTOMATIC
BUTTONHOLE
SEWING
Fig.
51
There
are
three
different
kinds
of
buttonholes:
a)
The
ordinary
buttonhole.
b)
The
buttonhole
with
cord
inlay.
c)
The
raised
buttonhole.
The
ordinary
buttonhole
This
is
sewn
with
normal
under
thread
tension,
but
with
a
special
threading
of
the
bobbin
ease.
The
sewing
of
the
buttonhole
is
effected
without,
turning
the
cloth
around.
This
can
be
made
either
step
by
step,
the
machine
being
stopped
after
each
operation,
or
in
one
working
operation,
i.e.
without
interrupting
the
various
working
stages.
It
will,
however,
be
well
to
learn
sewing
buttonholes
step
by
step;
after
a
little
time
you
will
naturally
be
able
to
sew
the
whole
buttonhole
in
one
single
working
operation
as
well.
Fig
i0
The
threading
of
the
under
thread:
An
increased
tension
of
the
under
thread
produces
still
better
results
when
sewing
buttonholes
automati-
cally.
To
get
this
higher
bottom
thread
tension
without
changing
the
lower
tension
itself,
which
is
cor-
rect
for
normal
sewing,
see
fig.
50,
a
hole
has
been
drilled
through
the
finger
of
the
bobbin
case
through
which
the
under
thread
has
to
be
17
It
record
19
20
\Ow