-
22
-
(B-138)
armature is against the operated stop mt (marking stop). The faces of the
cores should be parallel to the tace or the armature. To adjust, position the
bracket
by'
maana
ot its enlarged mounting holes.
HOLDING
!!.AGNEr
S:EUX:TOR
M&:HANISM ADJUSTMENTS
THE HOLDING MAGNEr
S
ELPX:TO
R
ILLUSTRAml
IN
FIGURE
40
SHOUlD MEET THE
FOLLOWING
REQUIREMENTS
(See
Page
16
for
Pulling
Kagnet Selector Adjustments)
RS{OVE T HE RAWE
FINDER ASSEMBLY
ARMATURE
PIVOT
SCREN
ADJUSTMENT (Figure 40) See Note (A)
With the armature lever spring and the selector
arm
spring unhooked,
the armature lever should be free on its pivots with barely perceptible
end
plq. Adjust by means or the upper pivot screw.
SEI,J!X;TOR MAGNET ADJUSTUENT (Figure
41)
See Note (A)
The armature, when in its operated position, should touch both magne·t.
cores at approximately the centers of their pole-faces, al'¥1 the cores should be
centrally located with respect to the armature as gauged by eye when holding a
light background behind the magnet
ani
armature assembly. To adjust, remove
the sal.ector magnet bracket from the typing
unit al'¥1
reposition the magnet core
assembly by means or its mounting screws while holding the assembly
so
that the
cores
are
vertical
am
the armature, by its own weight, rests against the pole
faces.
R eplace "the selector magnet bracket.
NOl'E: When the cores are in proper adjustment, it should require at least
3-l/2 lbs., applied at right angles to the armature edge midwq
between the cores, to separate the armature from the cores when a
current of .020 ampere is flowing through the magnet co ils {coils in
series shunted by 5000 ohm resistance).
SElECTOR
ARM
PIVOT SCREW ADJUSTMENT (Figures
42
and 43) .See Note {A)
With the armature lever spring, the selector
�
spring,
and
selector
arm stop detent spring unhooked, the selector
arm
should be free on its pivots
with bar� ·perceptible end play, and the locld.ng lever should overtravel the
top and bottom edges or the locking wedge. There should
also
be a minimum
clearance of .00811 between the selector
arm and
the armature lever
and
a
mininDJ.m.
clearance or .010" between the selector
arm
am the selector
arm
stop detent
when the play in the detent is taken up in a d:!rection to make this clearance
!1
minimum.
The end play
rn;zy be
adjusted by meaas of the left pivot screw.
If
th e
minimum.
clearance requirements are not met, it
will
be necessary to remove the
selector magnet bracket
and
the selector arm bracket and adjust both pivot
screws of the selector
arm.
*
*
*
(A) These requirements should be checked with the range finder rerir)ved.
en
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N
�
w·
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