Motor Units - Teletype 28 Manual

f . Tbe selector mllj!Jiet
Printers In the system are connect ed In oerles with
transmitt ing
the of the
contacts
to
slcnaJinc used
eocle transmit
" "
· five-unit
etart ltop code
selecting Impulses,
used
c t
ren and n rent intervals. anct
ur o-cur
Each group of five aelectl"i lmpuloeo
lnc Impulses.
Ia preceded b y start Impulse
a
Tbe
Impulse. start
and
malntaln synchronism between
cult.
g. The ope ti
ng speed
ra
be 60 (368 OPM), 75 WPM
WPM
(600
WPM OPM) depending on U>e set of speed change
28
gears used. Model
The
100
supplied, Ia equ i pp ed lor
for other apeeds of operation can be supplied
tlonalequlpment.
Proj
All
ector
tem must be equipped operate at
to
the
.
sending station
2. DESCRIPTION OF COMPONENTS
a. TYP ING
UNIT
(1) Typing Unit lneorporatea the nee­
The
electrical
ooeary m echani
and
latlng he slgnalslnto
t
code
to record the message and
Incident thereto.
(2) signals
Code
magnet associated with a selecting mechanism which
t e signals
Interprets h
and contr
volved In typing a character or
Means
function. are
provided
lector t o the rece i v ed signal. The motor Ia
tho malo shaft ol the typing
functlonal sectJOilB of the
louo
by onlbe
lndlYiclllal clutches
completely disengage at the termination ol
ating cycle thus reduclncthe
when Idling.
(3) Typing accomplished
is
type pall e t.
hammer strikes the
arranced In compact,llgbtweigllt type box wblch may
a
for
be eaally cleaning or lor replaeemont by
detached
type
r . In operation, the type box keeps etep
anothe box
with a
printing carriage and presents the proper
to the
pallets printing hammer
as the printing carriage advances
A p e n Is p•ovlded
track. special
lat
i
In step with the r b
so
bon
printed on the transpare n t web
jected screen, before tbe
on the
printed.
(4) Tbe roll of �reM web
a roll er
on
between two brackets
Model 28 Projector Typing Unit (figure
paoaea forward a sertes of guide rollero
around
!ted roller adnncea lbe web In r eapoaae to the
that
feed mechanism, up between the platen
Uno
CHANGE 1
all
s of the Teletype
otaUon.
sending Tbe
character• Ia tbe
whlc:h conateta of ftye
,
In nrtous combinations of
two aynchronb­
followed
by a atop
and
stop lmpuleee are used to
all etatlon.a tn the ctr-­
of the Typl"i Unite may
(460 OPM) or 100
Receiver
Projector Set,
aa
WPM operation. Geara
op­
as
Unltaln a syo­
Typing
the
ao
eame apeed
lrano­
c features for
al
mechanical act ton In ordor
perform the ua.ral funett on a
applied to a two coil
are
In­
ola U>o motions
performl"i a
required
lor orlenlatlng tho
ae·
geared to
typl"i aod
t.
uni Tbe nr­
Typing Unit
are actJvated
.
Tbe
maln abaft clutcbea
oper­
eacb
load a
mlnlmum
motor to
when the printing
The type pallet a
are
t
ype
receive Ita strokes
to
along
the prlnll"i
which oaelllatea
U>e character belnc
that
11 readable, wben pro­
character Ia
next
Ia mounted
tJw ot tbe
at
rear
1·2).
web
Tbe
a
and
the
and
269B
rtbbon the upper guide roller& where It la
then around
on a driven eplndle.
rewound motor
Refer to FRONT, REAR,
ence
to the unit viewed from the operator's
as
front of set. However, thl a doea
the
Base,
Projector Typing Unit and Motor
mounted facing
tbe rear
plify servicing the unit.
the FRONT ol the Typing Unlt and
which
from the type box and platen can be viewed.
UNITS
b. MOTOR
(1) Synehronoua Motor
(a)
Tbla
phaa e , capacltoratart type.
and fan ts mounted on one end of the
- relay
motor alartlng
thermal cutout swttch,
under motor proper. Tbe thermal
the
(manually
reset) servea to protect the motor windings
from s.alYe heatlnc.
exce
(b)
The
to whlcb It Is beld by
mounts on the huba ol
of vibration
transmission
(2) Series or Governed Motor
(a) Thla unlt Ia
governed speed of
at a
runs
governor and !an are
moun
on
supported ball bearlnga.
ts
(b)
The electro-mechanical governor I s
wired series the
In
with
Ings. Targeta for apeed
gove cover.
rnor
(c)
The
lmize Interference.
radio
the motor
the undenlde of
tor capacitor, well ae an electrical noi.ae
and
as
pressor
powe
RECEIVING-ONLY
e.
Motor U
ni t , Unlt and
Typing
change) Bracket
Gear
Frame.
d. PROJECTOR FRAME
(1) The Projector Frame Ia designed to pro­
mounting f>.ciUUea for
vide
Typing Unlt,
Base
and
conde.n5er lenses, enlaret.nc
(llgur eo 1-2 and
motor
(2) The trame conalata of an
structure equipped with rollera
like
In the
.
track.s cabinet
frame aod ita mounted equipment to be rolled forward
•
Paragraph
1-2d(2)
NOTE
RIGHT or LEFT apply
posltlnn
apply to the
not
they
etnce
of cabinet
the In order to sim­
For purpoaea of this manual
Base is that side
motorIa ol tbe two pole, single
A comblnatlnn handwheel
r shalt. A
moto
capacitor, together with a
and
mounted In a compartment
are
switch
cutout
by a
motor Ia aupported
cradl
atrapa Resilient
at each eod.
the tor end bella reduce
mo
to the baae.
which
eerlea motor
a
3600 rpm. The combined
ted on the motor , which
shalt
armature an d two lleld
wind
chaddng
are marked on
min·
enUre motorIa ablelded to
A ahlelded compartment
bouaea tho guvemor reate­
r .
le.ada
BASE - SUPPOrts the
•
the
Intermediate (speed
Ia mounted In the Projector
and
the Model 28 Projector
projection lamp,
mirro
lena, winder spoo l
1·3).
angle Iron box­
that rtde on two
Thla permita tbe projector
In
are
e
­
the
on
a-up­
r ,
and
1-3