Pfaff dorina 72 - Page 18

If
the
bobbin
thread
runs
in
a
straight
line
on
the
underside
of
the
material,
the
needle
thread
tension
is
too
loose.
If
you
cannot
remove
this
fault
by
increasing
the
needle
thread
ten
sion,
you
may
have
to
decrease
the
bobbin
thread
tension
as
shown
in
A.
Regulating
the
thread
tensions
increase
needle
thread
tension
needle
thread
tension correct
or
(A)
*The
thread
tension
is
normal
ly
regulated
by
altering
the
r’eedle
thread
tension.
or
Correct
regulation
of the
thread tensions
is impor-
decrease
needle
thread
tant
for
obtaining
durable
and
tidy
seams.
If
one
of
tension
fF
the
tensions
is not
correct,
untidy
seams will
be
the
result.
The
tensions
are
regulated
as
shown
in
the
illustrations.
If
the
needle
thread
runs
in
a
straight
line
on
the
top
side
of
the
Remarks:*The
correct
tension
setting
depends
on
material,
the
needle
thread
tension
is
set
too
tight.
If
the
latter
is
the
fabric
used.
It is
best
to
try
out
which
set
at
number
4 or
lower
this
fault
should
not
normally
occur.
If
it
is the
best
tension
on
a
piece
of
waste
does,
it
is perhaps
necessary
to
increase
the
bobbin
thread
material,
tension
as
shown
in
B.
17
(B)