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Патент USA US2527571

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oct. 3l, 1950
L, s, MUNCK
2,527,567
TELEPRINTER- EXCHANGE SYSTEM
Filed Nov. 9, 1946
5 Shee’ßs-Sheet 1
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¿551/5 S. MI//VC/f
ATTO R N EY
Oct. 3l, 1950
L. s. MuNcK
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2,527,567
TELEPRINTER EXCHANGE SYSTEM
Filed Nov. 9, 1946
5 Sheets-Sheet 2
ATTORNEY
Oct. 3l, 1950
2,527,567
L. s. MUNcK
TELEPRINTER EXCHANGE SYSTEM
5 Sheets-Sheet 5
Filed Nov. 9, 1946
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INVENTOR
LESLIE S. MIJ/VCA’
BY
ATTORNEY
Oct. 31, 1950
2,527,567
|_. s. MUNCK
TELEPRINTER EXCHANGE SYSTEM
5 Sheets-Sheet 4
Filed Nov. 9, 1946
WQEma.
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[email protected]
[email protected]
INVENTOR
¿554/5 6. MUA/cfr
BY ¿î
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ATTORNEY
Oct. 31, 1950
_
L. s. MUNcK
2,527,567
TELEFRINTER EXCHANGE SYSTEM
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2,527,545? i
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UNlTEosTATEs PATENT oFFlcÉ
TELEPRINTER EXCHANGE SYSTEM >
Leslie Stampe Munck, Croydon, England, assignor
vto Creed and Company Limited, Croydon, Eng
land
Appucation November 9, 1946, serial No. 709,041
In Great Britainv September '7, 1945
Section 1, Public Law 690, vAugust 8, 1946
f
f’
'
.
Patent expires September 7, 1965 `
4 claims.
(crus-_3)
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2
This >invention relates to automatic exchange
for subsequent automatic transmission at a sec
systems for teleprinters. My copending applica
tion Serial No. 606,725, filed on July 24, 1945,
ond or further attempt and itis the object of the
present invention to provide circuit arrange
now Patent No. 2,498,700, dated February 28, 1950, `
described such a system, among the objects of
which was that of providing circuit arrangements
whereby a teleprinter operator was entirely re
the circuit arrangements of the beforementioned
abandoned copending application Serial No.
ments, whereby an addition to or modiñcation of
632,440, allows the application of the automatic
dispatches to the type of teleprinter exchange
lieved of all operations incidental to the estab
lishing and clearing of connections through a
switching system, such connections being per
formed automatically by the said circuit arrange
ments from the teleprinter tape prepared by the
which returns an indication if a desired connec
10
' The variation ,from the arrangement described
in the above mentioned abandoned copending ap
plication Serial No. 632,440 wherein one auto
teleprinter operator. The teleprinter operator,
thus relieved of the necessity of setting upa con- >
nection by means of a telephone dial, types mes
tion cannot bewholly established on demand.
vmatic transmitter is employed, consists in. rout15 ing all messages, which at iirst attempt cannot
sage text continuously at her natural speed for
the duration of her duty period, merely pre?ixing
each message by the code signal of the wanted
.obtain a connection, together with their destina
tion-indication or route signals to a receiver at
the sending station where they are stored in tape
orm.
station, that is, by the destination-indication
signal, and ending with the “end of message” 20 The tape containing the stored messages is
signal.
then preferably fed into a second automatic
Also, in the arrangement of my copending ap
transmitter, the said second transmitter being
plication Serial No. 632,440, filed on December 3,
1945, and now abandoned, which is a division of
the above mentioned application, in Great Brit
ain, an intermediate station not being the station
given an opportunity of discharging one of the
messages at predetermined intervals, and such
intervals may be determined as a percentage of
effective connections; for instance the second
automatic transmitter may be allowed to trans
for which the message was intended but being as
near thereto as a connection could be established
would receive the message for subsequent auto
mit the first of its stored messages after every
ten messages transmitted from the lirst auto
matic dispatching when the further stage in the 30
matic transmitter.
connection to the wanted station could be estab
If the second attempt to establish a connection
ends in failure the Vprocess could be repeated
lished, that is„the arrangement of the prior in
vention was dependent upon provision being made
to route messages, in case a link in the connec
f
but if the intervals before the second attempts are
judiciously chosen the only reasons why the sec
tion were found busy, to an overflow position 35 ond attempts fail are likely to be a line fault or
_ long engagement. In these cases special treat
such as a reperforator at the intermediate sta
tion.
ment rather than a third attempt should be given,
and the attention of the exchange supervisor is
However, it is necessary to take care of the
kind of system in which a teleprinter exchange
required who would take appropriate action such
returns a busy indication or some other indica 40 as calling the maintenance service or offering the
call to the busy circuit.
tion that the connection cannot be established in
which case the caller would be expected to make ~ >
another attempt at a later time. In any case
requiring a further attempt, a different method
In any case Where a second attempt to estab
lish a` connection fails, an alarm signal is given >
and the messagecontinues to feed through the
of dispatching from that described in the .applica-v 45 automatic transmitter in vorder that the next
tion referred to above would be-required, because
stored message may be reached. The message
having sent a busy indication, the exchange
need not be recorded or stored.
'
Would not expect the message to be transmitted.
According to a feature of the invention, we
It then follows, as a desideratum that'the mes
provide an automatic or semi-automatic tele
sage` should be stored at the originating station 50 printer exchange system in which at a first sta
3
2,52%,567'
4
Figure 'l is a counting circuit cooperatively re
tion a plurality of messages each preceded by a
lated with the circuit of Figure 2 to provide the
destination-indication signal are recorded on a
improvement in accordance with the present em
tape and said tape is passed through a ñrst auto
bodiment of the invention; and
matic transmitter, comprising means for storing a
Figure 8 is a schematic diagram of a circuit
destination-indication signal whilst it is being Ul
operating to run out the tape in the improved
transmitted to the exchange, means operative in
exchange system hereinafter to be described.
the event of a signal being received that the con
In the drawings Fig. 3 is designed to join Fig.
nection cannot be established to transmit the
2 at the left-hand end thereof and Fig. 4 is joined
stored destination-indication signal into a re
ceiver producing a tape suitable for controlling a 10 to Fig. 3 at the right-hand end of Fig. 3. Figs.
'7 and 8 are joined to the lower edge of Fig. 2.
-To facilitate the tracing of circuits which ex
tend over the four sheets of wiring diagrams the
connections joining the diagrams have been iden
second automatic transmitter, and to cause said
ñrst automatic transmitter to transmit the mes
sage into said receiver.
According to another feature of the invention,
we provide an automatic or semi-automatic tele
printer exchange system comprising means at
a station for storing on a tape a destination-indi
cation signal followed by a message, means for
feeding said tape into a ñrst automatic trans
15 tified by placing thereon, the reference numeral
of the contact or other circuit element ñrst en~
countered when passing from one sheet to an
other.
The following detailed description of the inven
mitter, means for causing the signals resulting 20 tien has relation to the particular arrangement
where the receiver is a reperforator whereby in
the event that in a ñrst attempt to obtain a con
from the passage of the destination-indication
on said tape through said transmitter to be stored
at said station and also to control the setting
nection, a busy signal is received or no connec
up of a connection, means for arresting the feed
tion is established, the destination-indication
ing~ of said tape after passage of the destination
25 signal and the message are passed to a reperfora
tor, subsequent re-transmission being made from
indication and before the passage of the message
through said transmitter, means operative in the
event of a signal that the connection cannot be
established being received to transmit the stored
destination-indication signal into a local receiver
producing a tape suitable for controlling a second
automatic transmitter and to cause the said first
automatic transmitter to transmit the message
the resulting tape from the reperíorator. ' The
3:0
to the printed or marked characters.
According to a further feature ofthe invention, I
we provide an automatic or semi-automatic tele
printer exchange system comprising means >at a
station for storing on a tape a plurality of mes
describe the circuitry as disclosed in my two' co
pending applications as already mentioned above.
rl‘he drawings incorporate all of the material from
' these prior applications and the following dis
cussion, until otherwise indicated, will be mere
repetition of these prior disclosures. In this
manner it will become readily apparent how the
present invention provides for an improvement
sages each preceded by its destination-indication,
means for feeding said tape into a first automatic
transmitter, means for controlling the passage of
said tape through said automatic transmitter by
signals received from the exchange and means
for routing such messages as at a ñrst attempt
respective destination-indications to a local re
ceiver adapted to produce a tape suitable for con
'
In order to completely understand the opera
tion of the present system it will be necessary to
into said local receiver.
do not obtain a connection together` with their
arrangement may take other forms; however,
within the spirit of the invention, such for ex
ample where the receiver prints or otherwise
marks a tape and the subsequent re-transmission
takes the form of a scanning device responsive
»
over the known systems.
There will ñrst be given a general description
of the functiioning of the out-station equipment
in the sending of a message, this being made with
more particular but not necessarily exclusive ref
erence to Fig. l; and then there will be given
». The invention will be described with reference
to the accompanying drawings showing Figures 50 the corresponding detailed description with ref--v
erence to Figs. 2 to 4.
'
‘
`
1_8, wherein:
trolling a second automatic transmitter.
Figure l is a block-schematic relating to an
The teleprinter keyboard perforator is provid
ed with two extra but otherwise normal keys,
out-station in an automatic telegraph exchange
a key AK for operation at the “start of ’mes
system and corresponds to Figure 1 of my co
pending application Serial No. 606,725, as men 55 sage” (call) and a key ZK for operation at the
“end of message” (clear).
tioned above;
’
'
«
One key may perforate a nick in one edge of
Figure 2 is a detailed circuit diagram pertainnk
the tape and the other key a nick in the second
ing to the automatic transmitter and the control
edge of the tape, while the automatic transmit
circuit of Figure l. Figure 2 is similar to Figure
2 of my copending application Serial No. 606,725 60 ter may be provided with two switches, one to
close when the “call” nick is detected and they
but includes additional control and transmitting
second to close when the “clear” nick is detectequipment in accordance with the main object
ed:
of this invention;
. Figures 3 and 4 illustrate a storage and con
The perforated tape prepared by the keyboard
verter circuit as utilized in the present embodi 65 perforator is fed into an associated teleprinter
automatic transmitter and allowed to pass freely
ment of the invention. These iigures are similar
through it.
'
to Figures 3 and 4 of the mentioned copending
When a nick indicating “start of message”
application and have been included herein in or
(call) is recognized by the automatic transmit
der that the complete system, in accordance with
the preferred embodiment of the present inven 70 ter, the effect is to stop the passage of tape and
call the exchange.
tion, may be easily understood;
Figures 5 and 6 are sketches illustrative of the
After an interval the exchange sends back the
marking of the tape and of its passage through
‘fproceed to dial” signal which, via the control
the automatic transmitters as disclosed in my
circuit, causes the automatic transmitter to send
prior application;
i the digits of the wanted station into the control
2,527,567.
5';
circuit vin teleprinter code.- Thefco'ntrol circuit
so divided that the sum of `all segmeiìtê‘lrepre‘è'"
sents a complete arhythmic signal and each seg’-A
passes these signals. into a local >teleprinter and
into „a storagepircuit;- TheA digits Vare .set up,
and are. also passed tothe converter circuit which
translates them as received into digitalr'impulse
ment represents one signal element; thus, there
will be the start, iirst, second, third, `fourth, iiítli
and stop segments, The'stop segment has a `small
insulated portion,"on'fwhich the brush rests when
trains suitable for .operating selector :switches
not in action. Ring VTR'is not connected, except
and'rsendsrthem out to line via the control cir
cuit.>> These impulse trainsare utilizedîby the-
for a. portionv of the same lengthas and in phase
still _in teleprinter code, Vin the storage circuit,
with the stop segment of ring SR. _The brush
exchange in known manner to set up the desired 10 BR is allowed to make one `revolution when(A thev
connection, and. 'when the connection is'set -up
electro-magnet DEM is energized,v
,
to a station that stationl sends back its call .num
«In this description, which has been presented
ber in teleprinter code by meansof itsfanswer
back mechanism, which may operate-leither‘auï>
in tabular fashionso far as is practicablenthe.
references torelays use capital letters for the
tomatically vas soon as the connectiony is-set up 15
windings and small vletters for theA contacts.
or .in response to a’ “who are you‘ì‘” signal from
When the relay is operative the word “up’u’has
the-exchange.
been added to theV contacts-reference.
.ï
.
y'
'
I
y
`_
>>4’These called-station identity signals »are passed
backA through the exchange-"to vthe Ycalling lstaf
tion, where theyv are'directed-by the _control cir-`cuit into the storage circuit for Vcomparison with
thestored signals and lnto-the-localteleprinter
Call to exchange
20
Because the auto-transmitter detent. release
magnet DXM is de-energized, tape is being ,fed‘
into theA transmitter fromthe keyboard perfo
rator. The first indication which the transmit
ter receives from the tape that a message is'
coming is the arrival of the “call signal nick”
beneath the appropriate feeler. This closes theH
for‘record. If the stored-signals andthe answer
back- signals agree, the controlïcircuit allows the
automatic transmitter to pro'ceed‘with the text
of the message, and causes the Vstoragecircuit and
receiving teleprinter to‘drop outoff'circuit. f_If
call contacts AC in the transmitter, and in the
the answer-back signals do not agree with A¿the
stored signals, this disagreement is taken> to in
dicate'that an intermediate teleprinter receiv-_
control
circuit:
»
`
Relay C operates: +, AC, C, d2,--. ~
and locks: +. c2 up, C, d2, _.
magnet DXM energizes: +, fl, cl
ing point is taking the message l(as provided fory
in the type of exchangefunder consideration) ;I
then the‘controlI circuit'ñrst causes the desti
nation signals to be transmitted; lthis'` time in
DXM, -.’
upf~
Y
and tape-feeding stops.
A call signal is sent to the exchange: call gen
erator AG, c3 up, g2, send line and therequip
teleprinter code, and then allows- the l'message
to be transmitted, at the same time monitoring
the teleprinter receiver in circuit to print a copy
of the message in case it gets lost in its routing.
Also an “alarm” indication may be given. »For
Sending the wanted station number in normall
y impulses
instance, a copy of all messages could be. taken 40
ment
by the receiving teleprinter and the “alarm" de-f;
vice could actuate a ribbon change mechanism,
to indicate, in one colour of printing, which mes.-`
sages have reached the required destination and,l
in other colour of printing, which messages have 45
been taken at an intermediate point.
, At the end of the message, the automatic trans
mitter recognizes the perforationfindicating the
Waits.
'
`
Y
,
In due course a proceed-to-dial signalv cornes
back from the exchange over the receiver line,
and relay RR operates:
=
e
'
relay F operates momentarily: +, rr on space,
rectiñer RT, condenser, a2, F, --.
relay G operates: +, rr on space, RT, gl, G,
d3, _.
“end-of-message” signal, which causes the con
trol circuit to send a clear signal tothe ex 50
The send line is connected to a keysender
change. The perforated tape is allowed’ to con
sending contacts:
tinue feeding into the' automatic transmitter
until the next message is reached, when simi
lar functions to those described above are re
peated.
l
"
'
,
.
'
-
.
'
`
KSC, a4, g2 up, send line.
Magnet DXM is momentarily de-energized: fl I
55 up and the auto-transmitter is released to make
'
Detailed description'
one revolution for the sending. of onesignaL, at
.
the same time magnet DEM is momentarily en-À‘
Referring to Fig. 2, thecontrol circuit and the
ergized:
auto-transmitter circuit comprise the receive
line- RL (connected to a receive relay RR), the 60
_, da, iead DEM to Fig. 3, DEM, f2 1113,41,
send line SL, the auto-transmitter sending con
and brush BR of the distributor is released tof
tacts-XC, the call and clear contacts AC and
make ‘one revolution simultaneously with .the
ZC andthe transmitter detent release magnetY
auto-transmitter.
-
-
"
»
Y
:Thus the transmitter reads the first character-.1,
»The storage circuit shown in Figs. 3 and 4 com 65 perforated in the tape (beingthe “figures shift’.’l «
prises a telephone uniselectorl switch, havingv signal), and transmits it .both to the distributorz' '
seven arcs of twenty-live contacts, the arcs be
DXM.`
i
._
A
.
-
~
ing labelled LI . . .L1 and the» driving mag
net labelled 'LDM. The storage circuitfalso> con
tains an arhythmic distributor,v consisting of’a 70
Xc, k2, c4 up, al, leadv CR,V distributes
ring CR,
and to the local teleprinter: -,_- al, k3,v
Y
brush BR, which is driven at a speed of one lrev
Of the first, figures-shift signal, thestart ele- 1
elution-'in the duration offone complete arhyth
mic combination.` Thus ybrush sweeps over three
concentric - distributorY rings, CR, ' SR;V and ~-TR.
ment and ñve signal> elements are passed via'
seginents SR of the distributor to the"br‘ushes>
L2 to L1 of the switch L, but are there ineiïec'stiv'e‘?.-
Ring CR is electricallyflcontinuous.‘ Ring SR is
ïbecafuse these brushes in positional,:.standiloni
annate#
blankzcontacts. On -the otherß hand 'the „ stop
`¿The signal elements of the figures-shift have
element
no efîect;'-but'on receipt of the stop element re
lay RDM` operates: .-, rr, a3 up, B, al up, CR
ì
relay
effective.- and
RDM Aoperates:
.
.
l
'
^ '
l
" magnet LDM energiaesî’rdml up. l y
` and the switch L'stepslt'o position2.
,_
lead, ring CR, ybrush BR, segment SR stop, RDM,
ground and >energiaes magnet LDM so that switch
L steps' to position 6.
.
Relay F operates momentarilyf» -1-„ bank'V and
_ `wi'pe'rl'LZ` in .positionlllead L2, F,`Í-.V _
« The second character to be received is the ñrst
digit of the station number to which connection
has been made. It will first be assumed that the
said station is itself the wanted station, so that
y
de-energizing- magnet DXM and energizing mag
net DEM, bothl momentarily> as beforefso that
the auto-transmitter reads the second character
in the tape, (beingfthe hundreds digit, say “4,"
of the'wanted station number)v and transmits it
to the distributor; 'the distributor in turn passes
it into storage. Thus the five elements of digit
“41g _are
`
the number received back is the same as that
stored, and the ñrstdigit of this number is “4.”
On receipt of the start element of this Vfirst
digit,-magnet DEM energizes and the distributor
makes one revolution, exactly as before.
. ,Then the successive signal elements are re
.
ceived and are passed over the wipers and banks
L3 -to _L_'l of switch L to contacts ha2 to he2. I!
these successivesignal elements are S M S M S,
20 then ,there is no such operation of relay B as will
be described later.v
and are passed severally over segments I to 5
of distributor ring SR to wipers L3 to L1 of
switch L, contacts 2 of the respective banks being
connected to negative over dl.
'
The following relays will in >consequence op
erate
'
The reception of the tens and units digits, and
their comparison with the stored values, follows
similarly. On receipt of the step element in the
25
units digit, switch L steps to position 9.
'
Relay'A releases: Ll.
HA HG HE
HV HX HZ
n
Relay D operates: -, wiper LI, contact LI (9)
b3. .D9 + ,
The upper set, HA to HE, lock and constitute 30 and all the’storage relays HA to HE, TA to TE,
UA to UE, release: dl up.
the storage means.` The lower set, HV to HZ,
Relay C releases: d2 up.
have contacts in a chain circuit in the converter
Relay G releases: d3 up.
`
lportion of Fig. 4, so that a key-senderv solenoid
Relay RDM operates: -, d3 up, lead L2, wiper
S04 is energized, and the digit “4” is` transmitted
to line in the form of impulses of the type con 35 ' 'and'bank L2, k6, RDM,
and switch L steps round to position 25.
veniently usable in the exchange for the setting
of a selector switch: +, key-sender contacts
Message sending
KSC, a4, g2 up, send line.
Relay SH is operative throughout sending:
The auto-transmitter contacts XC are now
Magnet RDM energizes to the stop element in 40 connected to the'send line: XC, k2, c4, el, send
line magnet DXM de-energizes: c1, so allowing
the character and remains energized so long
thev auto-transmitter to transmit the complete
as relay SH isv operative, but finally releases.
message textas it appears on the tape; the local
Switch L steps to position 3: LDM energizing-and
teleprint'er TPR being disconnected at c4.
releasing and again relay F operates momen
tarily, so that in similar manner as before, the
tens digit is ,passed into storageeon a selec
tion of relays TA, to TE, and to the key-sender
’ At `the end of the message-sending, the “clear
by a similar selection of relays UA to UE.
nick” in -the tapecauses the clear contacts ZC to
In response to the stop-element in the units digit, 50 be closed, and relay E operates.
switch L goes to position 5; but this time there
_ The clear signal is connected to the line: clear
is no momentaryßperation of relay Fover
generator ZG, el up, send line.
Y
wiper and bank L2.
'
'
Relay A operates: LI in position 5. M
Answer back from-wanted station. , .
55
The calling :station equipment now remains
quiescent while the exchange endeavours to set
up the connection in response to the three digits
that ithas received in the form of normal digital 60
impulse-trains.
,
Release 1
j Relay RDM operates: e2 up, and switch L steps
to' position I.
Relay D'releases: LI leaving position 25' and
restores the circuit to normal.
The machine continues'to feed‘tape until the
next message is reached.V
Answer back from an intermediate storage
station
The exchange having set up the connection, it
‘1n-this case the answer back signals win differ
sends a “who are you” signal inlknown mannen».
from those stored on relays HA to HE, TA to TE, '
UA to UE. v Consequently, when the comparison
and the answer-back unit at the station to which
connection» has been made sends back the‘sta
is made over wipers and banks L3 to L1 in any of
tion identity consisting of the “figures shift',y
positions 6, 'l and 8,
signal followed by three digits in teleprinter
Relay-B operates: -5- or -, rr, a3 up, B, al up,
code. This answer-back signal passes through
»lead -CR,=ring' CR, brush BR, segment of SR.
the exchange to the calling station.
j
relay H, wiper and bank of L, ha2 or ta2 or ua2,
Upon receipt on relay RR of the start- element 70
of the ñrst (ñgures-shift) signal, magnet'DEM
»---or,+.
» '
When -fthe answer back signals have been com~
energizes momentarily: +, rr on space a3 up,l
lead> L2, wiper L2, contact 5 of bank L2, DEM,
pletely received, the switch L will stand in
lead DEM, d3, -, and the distributor starts to
>position 9. Relay K operates: -, wiper LI and -
make one revolution.
_
, ¿
Y
_
75
2, 52.7, 5.67
10
and the teleprinter TPR is switched to the> send
line:
-
'
Relay KA which is connected in parallel with
relay K and is shown in Fig. 8, will also operate.
At contact b4 of relay B, a negative impulse will
be transmitted to the “call” punch magnet CSP
v
TPR, k3 up, kl up,
,
Relay RDM operates: lcd up, wiper L2 and con
tact Ll2 (9), k6, up, RDM
(Fig. 8) of a local reperforator to punch a “call”
nick in the tape being passed into such reper
forator; and when relay KA operates in parallel
and switch L steps to position l0.
Magnet DEM energizes: lcd up, wiper L2 and con
tact L2 (Ill), DEM, d3
'
with relay K, contact ical will replace the sendline SL when the reperiorator magnet RPF (Fig.
`
thus releasing the distributor to send the hun-g 10 8), so that the message when released, will be
dreds digit in teleprinter code; -l- or ‘-, contacts
stored on the tape of the reperforator.
’
'haz to be2 contacts L3 (I0) to L1 (l0), wipers L3
to L1, HV to HZ, segments l to 5 of ring SR,
In this case relay C Fig. 2 remains in an"
oper-ated condition and the destination signals
are‘ transmitted from` the storage circuit of Fig.
brush BR, segment CR, ul , ‘c4 up, k2 up, send line.
Similarly with switch L in position I i, the tens 15 3 over conductor CR, al normal Fig. 2, c4 up Fig.
2, k2 up Fig. 3, kal up Fig. 8 and then to the
digit is sent, and with switch L in position l2, the
magnet RPF. The local teleprinter TPR is con-v
unit digit is sent. `
`
nected as shown in Fig. 3 to conductor KL over
Thus the message, as it is going to be stored at
k3 up >and KI up.
an intermediate station, is prefixed with its
Relay D operates on the conclusion of trans
20
destination number in teleprinter code.
mission of the destination signals and at its con
The switch L then steps to position 25.
tact d4 the transmitting contacts XC of the
Relay D operates: LI (25) b3 up, D and starts
automatic transmitter are connected to the local
the transmission of the message, at the same
teleprinter TPR and the reperforator magnet
time recording it on the local teleprinter: 25 RPF over the following circuit: X02, contact
XC, d4 up, k2 up to line, and to kl up, 7c3 up,
m4 Fig. '7, common junction at contact k2 Fig. 3,
d4 conductor, contact d4 up, k2 up Fig. 3, con
ductor KL to contact kal up Fig. 8 and hence
to TPR and RPF. The message is thus sent into
f The clear signal nick, as before, closes contacts
ZC, sothat‘relay E operates and releases the cir
cuit.
the register reperforator. At the conclusion of
the message, the “clear” nick in the original tape
» In the present embodiment of the invention
the operation will be discussed with particular
reference to Figs. 2, 3,- 4 and Figs. 7 and 8.
causes the “clear” contacts ZC to be closed and
transmitter is reelased to send a character from
instance, the “alarm’-’ "device could actuate a
its transmitting'contacts XC into a localtelev
ribbon-change mechanisrr1_,ïto indicate, in Vone
relay E operates. The additional contact e4 of
this relay in the present invention will close to exi-v
l >Referring to Fig. 2, the ñrst automatic trans
mitter is provided with the release magnet DXM. 35 tend a negative pulse through b5 up to the “clear”
punch magnet CLSP Fig. 8 which will punch
An indio-ation on the vtape closes contacts AC to
the “clear” nick in the tape. .
.
operate relay Cwhich in turnroperates DXM to
It will be noted that thelocal teleprinter is
halt the tapeffed-through Áthe transmitter. A
only connected to "receive messages that are
calling signal is now sent from the call generator
AG», Fig. 2 bywayy of 'c3 up, g2 normal, common 40 stored in the reperforator. It may, however, be
desired that the local teleprinter TPR should re
point on conductor-.KL Fig. 3, contact kal Fig. 8
ceive a record of messages sent out to the line
to send line SL and thusv to the exchange. When
as well as messages routed to the perforator and
the proceed-to-dial signal-is receivedfrom the
in this case an “alarm” indication may be given
exchange by relay RR in Fig. 2, the release mag
net DXM` is de-energized and the automatic 45. invth'e‘case of the last mentioned messages. For
color or printingwhi'ch messages have reached
printer TPR Fig. 3 and over conductor CR to the
the required destination, and in another color
storage circuit as already described. This release
of the automatic transmitter and storage of a 50 o_f printing which messages have failed to reach
signal sent therefrom takes place character by
a. destination jon 'a first attempt to establish a
character and the characters of the designation
connection and >are now stored in tape format
the sending station for a subsequent attempt as
as set up onthe storage means cause the trans.
mission of impulses over the send line SL to the
exchange.
l
.
If a connection has» been set up the> exchange
automatically sends out a signal usually called
the “who are you” signal to the station ,to which
the, connection has been set up, and this station
thereupon sends back an answer-back signal that
consists of its own particular identification. IfL
on> comparison the two signals are found to be
identical, this results in the operation of relay
D in Fig. 2. The operation of relay D results in
the release of relay C and such other relays in
will hereinafter be described.
55
'
'
'
As'previously stated, a second automatic trans
mitter is added to thesending station, its release
magnet DXMI, transmitter contacts XCl ,and
“call” and “clear” contacts', AC! and ZCI re
spectively, being interchanged with the corre-Y
60 sponding features of the first automatic trans
mitter when the relay M of Fig. 7 is actuated.
The reperforated tape is fed, as described laten
into the second automatic transmitter where it'v
is held` stationary _by the `normally open contact’
65 m1, FigQFI holding the release 1magnet DXMI. g
Figs. 2 and 3 as were operatedand thus in the
In Fig, v'îfthere> is` shown, a counting, circuit
de-energization of release magnet DXM of the
comprising atwo-bank"uni=selector switch hav-_
automatic transmitter. - The contacts XC of that
ing banks CB1 and CB2, afcontrol relay M, inter
connectedby various contacts thereof witlrthe'
transmitter are thus connected to the send line
SL. Y If a busy signal is returned from the ex-. 70
circuitry of Figs. 2. andl V3,-.a relay MRV and atime
change, this when compared with the destination
indication signals will not agree therewith Aand
the resultwill be the operation of relay B as
constant .network comprising a cold cathode dis-`
charge tube Cl, capacitor TCl and a resistor
.In the operationr of. this~ circuit each time relay.
alreadydescribed. When relay B operates it in
Cv is actuated*V by .any normal connection through
turn l,causesfthe operation of relay K in Fig._ 3. 75
A,at,contact.¿C.(ì Fig. 2, a pulse `is sent >tothe
2,527,567
counting circuit uni-selector magnet CDM. At
say the tenth operation of relay C, the Wiper on
bank CBI of this switch will connect negative
battery to operate relay M which locks over;
negative battery Fig. 7, normal contacts mrl,
e4, ml up, relay M Winding to positive battery.
The operation of relay M causes at the fol
lowing contacts:
m2 to change over the “call” contacts from AC to
ACI
m3 to change over the “clear” contacts from ZC
to ZCI to ZC2
m4 to switch the transmitting circuit from XC
of the ñrst automatic transmitter to XC‘I ‘of
the second automatic transmitter.
m1 and m6 to remove the holding current on the
release magnet DXMI of the second automatic
transmitter and to switch the release circuit
comprising contacts cI and fI from the release
magnet DXM to the release magnet DXMI
The reperiorated tape containing the stored
12
comprises a relay RU and a timing circuit con-y
sisting of capacitor RC, resistors RR and SR and
a cold-cathode tube C2.
'
When an impulse is received to operate the
“clear” nick punch CLSP of the reperforator, it
is also extended via normal contacts ruI left
hand winding of relay RU to positive. Relay RU
operates and locks over contact ruI. At contacts
m2, spacing battery is connected to the windings
10 of the reperforator over normal contacts ka2
thus causing the reperforator to receive contin
uous space signals and thereby to run out tape.
Contacts m3 remove a short-circuit from ca
pacitor RC which commences to charge via posi
tive and resistor RR. When fully charged the
cold-cathode tube C2 strikes and current passes`
via, positive resistor RR, anode and cathode of
tube C2, winding d--~c of relay RU, rul up, to
negative. The current in the c-d winding of
20 relay RU is reversed to that in the a-b winding
so that the magnetic flux is reduced to zero and
the relay restores to extinguish the tube C2, to
restore marking battery to the reperi‘orator and
transmitter which is allowed to attempt to set up
to discharge the capacitor RC.
the connection in the same manner as in the 25
With the reperforator operated to marking, the
original attempt from the first transmitter.
feed of tape is stopped.
..
messages is thus fed into the second automatic
When the counting uniselector reaches con
tact I0 on bank CB2, a positive battery is con
nected to the driving magnet CDM over the nor
Contacts ka'2 are added to the tape run-out
circuit of the reperforator so that the circuit is
disconnected when the reperforator is receiving
mal contact c6 to step the uniselector to the next 30 signals.
step. At the end of the stored message, the
Capacitor RC and the lower portion of resistor
“clear” nick causes relay E to operate which, as
RR could be made variable in order to vary the
in the case of the original attempt, breaks down
time of build up of potential on the tube C2 thus
the circuit, but at contact e4 it also releases relay
varying the amount of tape fed out after the
M to allow reversion to the first automatic 35
“clear” nick has been punched.
transmitter.
The method described above of disposing of
If, at the second attempt, the connection still
stored messages is capable of variation, for ex
cannot be established, relays B Fig. 2, K Fig. 3
ample one reperforator circuit need not be lim
and KA Fig. 8 will operate as before and at con
ited
to one operator’s position but may be con
tacts 7a4, a circuit is closed to the alarm, Figs. 2, 40
centrated to serve a group of positions. Simi
3 and 7, over negative terminal of the battery,
larly the arrangement described may be em
mrl, e4 normal, mI up, kl up, to the alarm de
ployed at a teleprinter exchange where storage
vice. This alarm device should be preferably
of
messages is permitted.
manually restored.
What is claimed is:
If no messages have been stored on the reper 45
1. An automatic or semi-automatic teleprinter
forator tape when the circuit is oñered to the
exchange
system comprising a calling station, a
second transmitter, no “call” nick will be pre
plurality
of
called stations selectively connectable
sented and a timed circuit will operate after a
through said exchange to said calling station, a
predetermined time to operate relay MR which
restores relay M to normal and hence to opera 50 iìrst automatic transmitter at said calling station
operative to transmit messages from a tape record
tion of the circuit through the first transmitter.
to respective called stations, each of said mes
In Figure '7, the timed circuit consists of a cold
sages being preceded by a destination-indication
cathode tube CI which, when contacts ml are
signal characteristic of a particular called sta
operated, strikes after a capacitor TC is charged
tion, means for storing a destination-indication
through resistor TR. The tube strikes between
electrodes AI and C and remains conductive be 55 signal at said calling station while it is being
transmitted from said first automatic transmit
tween electrodes A2 and C, this latter path al
ter, means to transmit a signal from said ex
lowing suiiñcient current to ñow to operate relay
change to said calling station indicative that a
MR which at contacts mrl opens the locking cir
particular connection to a designated called sta
cuit of relay M and its own operating circuit.
If, however, there is a message stored in the 60 tion cannot be established, a second automatic
transmitter at said calling station, a receiver
reperforator relay c operated by the “call” nick
reperforator at said calling station, means opera
in the tape opens the timing circuit at contacts
tive in response to said signal from said exchange
c1.
to transmit a stored destination-indication signal
Contact b5 (Figure -3) is used so that a clear
nick is only punched when a message has been 65 to said receiver-reperforator and to cause said
first automatic transmitter to transmit the mes~
switched to the reperforator. Contacts d6 and c1
sage accompanying said signal into said receiver
are used to disable the timed circuit when a
to produce a tape suitable for controlling said
stored message is being transmitted.
second automatic transmitter and means opera
After the reperforator has punched the “clear”
nick, it is necessary to feed a length of tape out 70 tive to connect said second automatic transmitter
to said exchange to discharge a stored message
of the machine so that when the second auto
after said first automatic transmitter has oper-_
matic transmitter is offered to the line circuit,
ated to send a predetermined number of messages.
there will be enough slack tape to enable the
2. The automatic or semi-automatic teleprinter
transmitter to run. Figure 8` shows one method
exchange system as claimed in claim 1 and furl
by which this may be done. The arrangement
2,597,567
13
ther comprising means, operative in the event
14
4. A teleprinter exchange system according to
that no message has been stored by said receiver
claim. 1, and further comprising means for feed
reperforator on the tape controlling said second
automatic transmitter at the time at which it is
connected to said exchange, to reconnect said
ñrst automatic transmitter to said exchange to
ing the tape from said receiver reperforator into
cause it to continue to discharge messages.
3. An automatic or semi-automatic teleprinter
said second automatic transmitter, means for
causing the tape to be fed through said second
automatic transmitter in a second attempt to set
up the connection to the desired destination, and
an lalarm signal device operated when the said
exchange system according to claim 1, in which
second attempt fails to establish said connection.
LESLIE STAMPE MUNCK.
means are provided and responsive in the event 10
that no message has been stored on the tape to
REFERENCES CITED
be passed through said second automatic trans
mitter when it is connected in circuit, to cause
The following references are of record in the
re-connection of the first automatic transmitter
ñle of this patent:
for continuation of the transmission of the mes 15
UNITED STATES PATENTS
sages, the last-mentioned means including a tim
Number
Name
Date
ing circuit consisting of a resistance and capaci
tance and a gaseous discharge tube controlled by
2,412,955
Bacon et a1. "___"- Dec. 24, 1946
said timing circuit.
'
2,424,223
Colman __________ __ July 22, 1947
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