+5
+4
+3
+2
+1
0
-1
-2 -3
-,
-5
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/\
/\
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,"
I , "
,"
"
L'
/
L_,
,_~,
,<,'
I \ I \
I
~
I
I,
I
..
_~
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1 \ r
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,
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Affected
By
FIGURE
78.
Insufficient Rotate
Arm
Motion
Ratio Change
detent
well within the
acceptable
band width provided
that
all
of
the
previous adjustments have been made
cor-
rectly.
If
a slight difference
in
detenting must exist
be-
tween
the
-3
and
+5
characters it
is
permissible and some-
times desirable provided
that
the
-3
detents more
nega-
tive then
the
+5
character.
In
other words, it
is
better
to have too much rotate arm motion than too
little.
The
reason for this
is
to
place
a small amount of wear
poten-
tial
into
the
system for the areas of the differential
mech-
anism where
wear
cannot be compensated for (positive
latches and latch
bail).
Thus, as wear occurs in these
areas causing
the
rotate arm motion to
decrease,
the
de-
tenti
ng
variati
on
between
the
+5
and
-3
characters will
also
reduce.
Figure 78 lIustrates the effects
on
detenting caused by
insufficient rotate arm motion.
Notice
that
the largest
detenting
variation
occurs between the
+5
and
-3.
This
is
because the
+5
and
-3
operate in opposite directions
and
the
error
that
appears when these two positions
are
compared
is
the
combined error of both positive and
neg-
ative
motion.
If
the
rotate
arm motion was excessive
the
detenting
pat-
tern would remain
the
same
except
that
each
detent
would be on
the
opposite side of its
detent
notch.
NOTE:
The
adjustment may be left loose during
each
check until
the
correct
position is
obtained.
11. Final Typehead Homing - (Eccentric Stud Adjustment)
Use
the
following procedure
to
adjust
the
eccentric
stud.
FIGURE
79.
Damper, Spring Stop - Preliminary
,
Adjustment
2-23
a.
Damper spring stop - as a preliminary adjustment,
slide
the
damper spring stop down as low as
it
will
go behind the damper spring (Fig.
79).
b.
Raise
the
compensator roller
all
the
way
to
the
top
of
the
V-shaped wedging
slot.
c.
Half-cycle
an
upper case
-5
character
and
adjust
the
eccentric
stud (Fig. 80) in against
the
machine
si
deframe unti I the
-5
character
detents
.010"
to
.020" in
the
negative
direction
from
the
center
of
the
detenf
notch when the head
play
is
lightly
re-
moved in
the
negative
di
recti
on
(Fig.
81).
Make
sure
that
the damper spring
is
fully collapsed against
the machine
si
deframe.
After
the
eccentric
stud has been properly adjusted
the compensator roller must be reseated by raising
it
to
the
top of
the
V-shaped slot
and
striking a
ser-
ies of
-5
characters.
The
compensator roller should
seat
1/16"
down
from
the top
of
the
slot.
If
it
drops
too
little
or too much the rotate link should be
ad-
Eccentric Stud
(Make Adjustment Here)
FIGURE
80.
Eccentric Stud
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