16.
Changing
the
Needle
(1)
Raise
the
needle
bar
to Its
highest
point.
(2) Loosen
the
needle
set
screw,
using a
small
screwdriver
for
this
purpose.
(3) Pull
out
the
old
needle.
(4) Insert a new
needle
Into
the
opening
of
the
needle
clamp
and
push
it up
as
far as
it will
go.
Make
sure
the
long
groove
faces
toward
you.
(5)
Tighten
the
needle
set
screw
securely.
17.
The
Sewing
Hook
The Pfaff 238 is organized with a System 134 double-revolution,
transverse
rotary hook
which moves counter-clockwise and is equipped with a special balancing collar to
ensure
vibrationless
running
of
the
machine.
This sewing hook features a welcome improvement over the old-type hook In that its
gib is held In place by one screw instead of the three screws used previously. This
screw
(e in Fig. 21) is located at
one
end of the hook gib while its
other
end
enters
a
small recess in the body of the hook.
Removal
of the gib for a thorough cleaning of
the hook, or in
case
of thread jamming, is exceedingly simple. Since the hook gib is
secured
by
one
screw
and the hook thread guard, or thread pull-off flange, by three,
the
two
parts
cannot
possibly
be
confused.
The springiness of the redesigned gib prevents bobbin
case
breakage
as a result of
thread
jamming.
Furthermore,
the
machine
will
never
be
blocked
to an
extent
which
will
make it impossible to get at the gib screw.
All
this
will
eliminate the necessity of re
moving the hook, resetting the hook shaft and retiming the sewing hook, a job for which
a
mechanic
normally
has
to
be
called.
Fig.
21
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