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Pfaff 145 Manual

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12.
Regulating
the
Pressure
on
the
Materia’
The
amount
of
pressure
to
be
exerted
by
the
presser
foot
must
be
adapted
to
the
material
to
be
sewn.
The
pressure
is
set
correctly
if
the
material
is
advanced
through
the
machine
evenly
without
being
injured
by
the
teeth
of
the
feed
dog.
The
pressure
on
the
material
is
regulated
by
turning
knurled
nut
V
(Fig.
1).
Turn
this
screw
in
for
less
pressure,
or
out
for
more
pressure.
On
Model
H
machines
the
pressure
is
regulated
by
turning
the
knurled
screw
in
the
upper
guide
bushing
of
the
presser
bar.
Turn
this
screw
in
for
more
pressure
or
out
for
less
pressure.
13.
Cleaning
the
Sewing
Hook
The
sewing
hook
is
the
most
essential
part
of
the
whole
machine
and,
for
this
reason,
should
be
cleaned
thoroughly
from
time
to
time.
To
do
this,
raise
the
needle
bar
to
its
highest
point,
open
the
bed
slide
and
remove
the
bobbin
case
with
the
bobbin.
Take
out
the
three
screws
E,
E2
and
E3
(Fig.
6)
and
remove
the
hook
gib.
Turn
the
balance
wheel
until
point
S
of
the
bobbin
case
base
is
about
to
enter
groove
N
of
the
hook
(Fig.
13).
When
in
this
position,
the
bobbin
case
base
can
be
tipped
out
easily
by
seizing
center
stud
Z
with
thumb
and
forefinger
while
turning
the
balance
wheel
back
and
forth
lightly.
Clean
hook
and
hook
raceway
thoroughly
with
kerosene.
If
the
cotton
wool
in
slot
0
(Fig.
13)
should
have
become
matted,
it
should
be
replaced
and
the
new
cotton
wool
be
soaked
with
oil
It
is
recommended
to
clean
the
vicinity
of
the
sewing
hook
with
a
soft
brush.
In
replacing
the
bobbin
case
base,
make
sure
that
position
finger
F
(Fig.
13)
enters
slot
P
on
the
underside
of
the
needle
plate.
Replace
the
hook
gib
and
secure
it
on
the
hook
with
screws
E,
E2
and
E3.
Put
a
drop
of
oil
into
the
hook
raceway,
replace
the
bobbin
case
with
the
bobbin
and
close
latch
B
(Fig.
6>.
R
9934
Fig.
13
11
… 12 …


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