To
adjust
the
position
of
lug 27,
proceed
as
follows:
With the machine switched off, turn the driving pulley bock
and
forth by
hand, let the
needle
stitch into a
piece
of
stiff
paper
and
check the position
of
the
needle
marks.
Loosen
nut 28
and
move
lug 27
back
so
that
it
does
not
affect
the position of
lever
H. With nut 28
slackened,
tap
on the lug
until the
needle
bar
vibration is
reduced
to
zero
and
the
needle
penetrates
the
material
in
one
and
the
same
point.
Tighten nut 28
securely.
The careful
adjustment
of
the
zero
lug, the
bartack
tripping
segments
and
the
stop
tripping
segment
and
their
proper
timing relationships
are
very
important
prerequisites
for
obtaining
durable
and
neat
buttonholes.
37.
The
Feed
Cam
Brake
In
order
to
retain
the
feed
cam
against
any
reverse
movement
which
may
be
caused
by the buffer spring when stopping the machine abruptly, an
adjustable
brake
is
provided
on
the
feed
cam.
This
brake
is
made
of two wire hooks 29
and
31 (Photo 41) which
are
connected
by
tension
spring
30. This spring is
contained
in a
groove
in
the
toothed
rim
of
the
feed
cam
and
is
fastened
to
stud
32
with
one
end
and
retainer
33
with
the
other.
To
regulate
the tension
of
the spring, turn
set
screw
34 of
retainer
33 on
the cam guard inwardly so that the cam will still turn easily without apply
ing
excessive
force.
38.
Adjusting
the
Tension
Release
Tripping
Point
Tension Sp^ must
be
automatically
released
when
the machine
makes
the
first tying stitch
after
campleting the end bartack.
This
will leave only
the top tension Spi
engaged
which is
set
for a normal
thread
tension
and
will
cause
the
threads
to
lock
within
the
material.
To-time the release of the tension, loosen screws 36 and 37 and move trip
ping point 35 as moy be
appropriate.
The tripping point 35 is
adjusted
correctly if its tip is
opposite
the center of the straight vertical side of
tension
release
lever 38 when the machine stops.
39.
Adjusting
the
StartinglLever
After starting the machine by depressing the right treadle, starting lever 39
is returned to its initial position by pressure spring 40. Its return motion
is checked by stop screw
41
which,
after
loosening nut 42, should be
set
in such a manner
that
there will be a clearance of .04"
(1.0
mm) between
the adjustable stud 43 of starting lever 39 and stop motion lever 1 when
the machine has stopped, provided the latter has been adjusted correctly.
46
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