To dismantle the sewing hook, take out screws
el,
e2
and
e3
(Fig.
20)
and remove
the hook gib. Then rotate the balance wheel until point S (Fig. 21) of the bobbin
case
base is about to enter raceway N of the sewing hook. In this position, the bobbin
case
base
can
be
tipped
out
easily.
The second sewing hook Is dismantled in the same sequence.
The cotton in hole O of every sewing hook
(Fig.
21) should regularly be soaked
with
oil
so as to ensure proper lubrication of this vital part over a longer period of time.
After
tilting
the
machine
back,
oil
the
oiling
points
marked
by
arrows
in
Fig.
22.
R
8319
Fig.
22
Additional
Instructions
for
Pfaff
machines
343
U-12/02
and
343
U-12/03
The Pfaff 343 U-12/02 is a
single-needle
sewing machine
equipped
with a two-spr
Stop
motor
and
a
roller
thread
tension,
while
the
Pfaff
343
U-12/03
is
fitted
wif
squirrel-cage
induction
motor
and
a
disc-type
tension.
Both
machines
are
equipped
an
extra-large
vertical
rotary
hook.
Other
than
that,
the
mechanical
setup
of
the
Pfaff
343U-12
is
identical
with
that
of
ordinary
Pfaff
343
so
that
all
operating
and
servicing
instructions
given
for
the
latter
a
apply
to
the
former,
the
only
exception
being
Chapters
10
and
13.
21.
Threading
the
Needle
of
the
Pfaff
343
U-12
"t.ead the thread from the spool up and over the thread guide at the top of the thrc
^'itand,
down
and
through
the
hole
of
the
angular
thread
guide
on
the
machine
arm.
i-.
through
the
thread
retainer,
making
sure
that
the
thread
enters
the
slot
in
the
thread
tainer
stud.
Now
wind
it
once
around
the
roller
tension
of a
subcl.
-12/02
machine
lead
it
clockwise
around
and
between
the
tension
discs
of a
subcl.
-12/03
machif
Then
pass
it around the
thread
controller disc, through the
thread
check spring, up a
through
the
thread
guide, from right to left
through
the
eye
of
the
take-up
lever, do
and
through
both
thread
guid
es,
and
from
left
to
right
through
the
needle
eye.
The
Pfaff
344
U-12
has
two
needles and
twin
thread
guid-
III
es.
It is
threaded
just
like
a
single-needle
machine,
ex-
needle
is
threaded
from
right
ft
to left,
the
right
needle
from
R
9770
a
Fig.
23
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