Pfaff dorina 75 Owner's Manual - Page 18

Regulating, thread, tensions

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

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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)