The
lifting
motion
of
the
vibrating
presser
should
be
timed
so
that
the
latter
descends
onto
the
material perpendicularly from above when the feed points of the rising feed dog are flush
with the surface of the needle plate. This setting
should
remain the same, regardless of
the
top feed stroke set. The vibrating presser
should
remain in
engagement
with
the
material
throughout
its feed stroke,
and
at the
end
of its stroke
should
rise perpendicularly again.
The perpendicular motion at
the
beginning of its feeding action
should
be twice as large as
that
at
the
end
of
its
stroke.
Adjustment is
made
by turning top feed driving eccentric OH on
the
arm
shaft
(Fig.
44),
as
may
be
required.
To
do
this,
remove
the
machine
arm
rear
cover
and
turn
the
arm
shaft
until
set
screws
11
and
12
can
be
loosened
by inserting a
hexagon
socket
screw
wrench
through
the
openings
in
set
collar
ES.
Only
one
of
these
openings
is visible in Fig.
44
exposing
screw
11.
Be
sure
you
do
not loosen
screws
13
and
14
which
secure
the
set
collar In position. After this adjustment,
tighten
set
screws
11
and
12
securely.
If
the
vibrating
presser
should
rise
clear
of
the
fabric
before
it
has
reached
the
end
of
its
stroke,
adjust
the
two-armed
lever
so
that
its
roller
contacts
the
inclined
surface
of
the
upper
presser
bar bracket a little later (i.e. so
that
it is positioned further to
the
right slightly).
Fig.
44
R
9473
47
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