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Teletype 28 - 4.05 LETTERS-FIGURES Contact Mechanism

Teletype 28
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SECTION
573-118-700TC
4.
05
LETTERS-
FIGURES
Contact
Mechanism
(For
Later
Design
see
3.
12
and
3
.18)
MOUNTING
BRACKET
MOUNTING BRACKET
Requirement
,.----------With
unit
in
LETTERS
condition
and
function
clutch
disengaged,
left
side
of
contact
should
be
closed.
To
Adjust
With mounting
nuts
loosened,
rotate
mounting
bracket
until
left
side
of
contact
just
closes
and
note
position
of
actuating
blade.
,Rotate
bracket
further
until
actuating
blade
is
approximately
POSITION
OF
BLADE
AT
INITIAL
CLOSURE
----0.020
inch
beyond
noted
position.
Tighten
nuts.
~
SIDE
OF
LETTERS-
")'>
START
OF
RIGHT SIDE
OF
FRONT
TIMING CONTACT
LETTERS-FIGURES
CONTACT
TEST
Operation
of
letters-figures
contact
can
be
checked
by
means
of
Teletype
signal
distortion
test
set.
END
OF
RIGHT
SIDE
OF
FRONT
TIMING CONTACT
grARTOFLEFT
~
~
FIGURES
CONTACT
. END
OF
LEFT
SIDE
(-y
Vary
5
Div)
- 0 =
~F
LETTERB-FIGURES
CONTACT
To
Check
START-ZERO
MARK
Record
start
and
end
of
trace
of
right
side
of
front
timing
contact.
Connect
neon
trace
lamp
across
left
side
of
letters-figures
contact.
Alternately
select
LETTERS
(12345)
and
FIGURES
(12-45)
code
combinations
and
observe
trace.
Set
START-ZERO
mark
of
test
set
scale
at
start
of
trace.
(1)
Requirement
Left
side
of
letters-figures
contact
should
close
before
right
side
of
timing
contacts
close
and
should
open
after
right
side
of
timing
contacts
open.
(2)
Requirement
No
bounce
or
chatter
of
letters-figures
contact
during
part
of function
cycle
when
right
side
of
timing
contacts
are
closed.
Page
160

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