If, on
the
other
hand, the vibrating presser
should
remain in
engagement
with
the
material
after
it
has
reached
the
end
of its stroke,
adjust
the
position
of
the
two-armed
lever
so
that
its
roller
is
positioned
further
to
the
left.
Both
these
adjustments
are
made
as
follows;
Loosen
alien
screw
J (Fig.
44)
and
swing
crank
VK
down,
if
the
vibrating
presser
rises
too
early,
or
up,
if it
rises
too
late.
To
check
whether
the
setting
is
correct,
tighten
alien
screw
J
again.
Any
adjustment
of
the
two-armed
lever
necessitates
a
readjustment
of
the
vertical
position
of
the
vibrating presser,
as
instructed
in
Chapter
32,
and
possibly
a
readjustment
of
the
top
feed
lifting eccentric. The adjustability of the
two-armed
lever is limited,
but
the
space
available
for
adjustment
is
large
enough
to
meet
all
conceivable
requirements.
In
adjusting
the
top
and
bottom
feeds
of
the
Pfaff
467,
care
should
be
taken
that
all
parts
are
inserted
in
the
correct
position
and
work
smoothly.
This
is
important
in
order
to
ensure
accurate
feeding
of
"problem"
materials
and
prevent
damage
to
the
parts.
37.
Checking
the
Top
Feed
Motion
Since it cannot be avoided that parts having unfavorable tolerances are mated occasionally,
it may happen that the strokes of the vibrating presser and of the feed dog differ slightly.
To
check
this,
proceed
as
follows:
Set the machine for its maximumstitch length and the top feed pointer on 0. Lowerthe presser
bar so that the vibrating presser and the presser foot rest on the feed dog. Rotate the balance
wheel and watch the motion of both the vibrating presser and the feed dog.
If the strokes of the vibrating presser and of the feed dog are exactly the same length, both
feeders
will
parts
smoothly
at
the
end
of
the
feed
stroke.
If, however, the vibrating presser makes a little jerk in the direction of feeding as it rises clear
of the feed dog, its stroke is a little too long. If,on the other hand, the vibrating presser snaps
back
toward
the
operator
slightly
as it
reaches
the
end
of its
stroke,
the
latter is a bit
too
short.
To remedy this condition, loosen nut f (Fig. 41) and reposition connecting rod hinge screw
GS inthe slot of crank KU.To makethe stroke ofthe vibrating pressershorter, move hinge screw
GS toward the feed regulating shaft, to make it longer, move it away from this shaft. After
this
adjustment,
tighten
nut
f
securely.
48
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