Bernina 900 electronic - Buttonhole Adjustment; Adjusting Buttonhole Without Thread

Adjusting
buttonhole
without
thread
CAUTION:
The
needle
must
not
be
blunt
or
bent,
Check
position
of
buttonhole
foot.
t
The
bead
widths
and
bor
tack
widths
are
jW7
controlled
by
the
built-in
carts
and
there-
SW
5_
t
tore
cannot
be
adjusted,
5
Set
zig-Zag
knob
to
posilon
A,
Set
stitch
selection
knob
(14)
on
the
first
bar
tack
and
stitch
length
knob
(22)
bet-
ween
positions
.
and
"0
5.Use
raw,
2-ply
cotton-cretonne
for
sewing
material.
place
it under
the
buttonhole
foot
and
start machine.
j37
In
this
position,
feed
of
the
material
must
K
not
occur
if
it
does,
correct
the
adjust-
ment
in
the
following
manner
On
forward
feed
loosen
locknut
i140)
on
eccentric
screw
(139)
slightly
and
usinlg
a
secondi
fork
wrench
adjust
upwards
until
a
the
work
is
no
longer
fed.
If
backward
feed
occurs,
adjust
cam
screw
(139)
in
the
same
manner
but
Fig.
29
downwards
CAUTION:
Retighten
check
nit
(140)
wit-
hout
rotating
cam
screw.
Check
second
bar
tack
If
feed
of
the
material
still
138
137
140
138
139
Fig
30
18~~~~~~~~~~~~~~~~~4