has almost reached the top of Its stroke.
Since
this spring is
subjected
to excessive
stress,
it may
become
weak
or
even
break
after
some
time by fair
wear
and
tear.
This
becomes
evident
when
the
machine
ceases
to
stop
evenly or when
the
needle
bar
and
the take-up lever do not always stop at the
same
positions. As a result, the
needle
may
stop
before
it
has
reached
the
top of Its
stroke
and
may be
broken
by
the
thread
wiper
upon lifting the work clamp. To correct this and similar conditions, exchange the buffer
spring,
as
follows:
Remove tension
springs
N and 0 (Fig. 25), loosen
screw
K (Fig. 26), pull out hinge
stud
Q
and
strip
stop
motion lever p (Fig. 25)
and
brake
lever R.
Next,
take
out
the
four
screws
b,
strip
cap
ring A
and
remove
stop
cam
S
and
the
bro
ken
buffer
spring.
Insertion of a new spring Is greatly facilitated by the
use
of a special wrench (Fig. 27)
which will be
supplied
by us on
special
request.
v.'.usi
• -"-i
Fig. 26
Proceed,
as
shown
in Fig. 27, by
inserting
a
suitable
punch
into
hole
I of
the
driving
pulley. Then rotate the pulley until punch D rests
against
the bearing bracket.
Insert
the
buffer
spring
into
the
receptacle,
place
the
loose
check
block
on
the
stud
of
the
wrench,
and
push
the
wrench
over
the
end
of
the
arm shaft, with
the
loose
check
block
contacting
the
loose
end
of
the
spring.
Now, with
the
wrench
in
your
left
hand,
.
compress
the
spring
and
place
the
Novotext
segment
between
both
check
blocks. Make
sure
the
flat
sides
of
the
check
blocks
face
toward
the
segment.
Then
replace
the
stop
cam
and
the
cap
ring
and
screw
them
down. Attach
the
brake
lever
and
the
stop
motion
lever.
R'5788
Fig. 27
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