Sp
Phofo
17
For
best
results, cotton No.
36-50/4
or 6-cord is used as needle threod.
It cannot be emphasized enough
that
only first-class thread should be .used
so
that
the high sewing
speed
of the
PFAFF
3114 can fully be utilized.
To prevent ravelling of the buttonhole, tension Sp 2 is automatically released
when making the last
two
or three stitches
and
tension Sp 1 will cause
the
threads
to
form
a
durable
concatenation
inside
of
the
fabric.
Tension
Sp 1 is released when the machine has stopped.
To
ensure
that
the
needle
thread
will be pulled into the
material
securely,
tension Sp 1 is released by means of lever A (Photo
18)
while the buttonhole
is
cut
open.
In
case
inferior quality
thread
is used, only whipstitch buttonholes can be
sewn
on the PFAFF 3114. For this
purpose,
loosen
the
thumb nut
of
tension
Sp 2 so
that
only tension Sp 1 will remain active.
17
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