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11
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In
fig.
12,
the
needle
thread
tension
may
be
too
loose
or
the
bobbin
thread
tension
too
tight.
The
operator
will
have
to
decide
in
each
individual
case
whether
or
not
either
tension
requires
adjustment,
particularly
so
the
thread
forms
small
krots
or
loops
on
the
upDer
or
underside
of thc
material.
Fig.
11
Note:
The
neede
thread
tension
can
only
be
adjusted
with
the
presser
bar
lowered,
as
raising
the
presser
bar
will
automatically
release
thu
tension.
8.
Regulating
the
Pressure
on
the
Material
According
to the
use
for
which
they
are
intended,
the
PFAFF
28
sewing
machines
are
fitted
either
with
a
roller
presssr
or
with
a
presser
foot.
Proper
feeding
and
even
stitching
as
weil
as
preventing
injury
to
the
underside
of
the
material
through
the
teeth
oF
the
feed
dog
depend
on
the
proper
adjustment
of
the
pressure
on
the
material
exerted
by
the
ralier
presser
or
presser
foot.
Through
turning
adjusting
cap
screw
V
inwardly,
the
pressure
on
the
material
in
increased;
and
through
turning
it
outwardly
cEEC
,
decreased
(see
photo
7).
For
stitching
delicate
leather,
it
is
absolutely
necessary
to
adjust
the
pressure
on
the
material
very
carefully
in
accordance
with the
thckness
and
the
quality
of
the
leather
to
be
sewn.
9
Choosing
the
Proper
Needle
Far
obtaining
perfect
seams
in
leather
work
with
PFAFF
28
machines,
it
is
imperative
that
the
proper
needle
sizes
be
chosen.
8
Fig.
12
11


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