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Патент USA US2128788

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Aug. 30, 1938.
-
M. AMANN ET A1.
2,128,788
TELEGRAPH INSTALLATION
Filed March 28, 1936
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MAX ÁMANM
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ALF/¿ED LAHL.
2,128,788
Patented Aug. 30,1938
UNITED STATES smear ori-‘ies
2,128,788
TELEGRAPH INSTALLATION
`Mair Amann, Ludwig Günther, and Alfred Lahl,
Frankfort-on-the-Main, Germany, assignors
to Nationale Telephon und Telegraphen
Werke G. m. b. H., Frankfort-on-the-Main, Ger
many, a corporation of Germany
Application March 28, 1936, Serial No. 71,418
In Germany April 18, 1935
12 Claims.
This invention relates to printing telegraph
apparatus and, more speciñcally, to answer back
devices with which such apparatus can be pro
vided.
These answer back devices are provided
particularly in teleprinting installations oper
ated through exchanges, to enable an identifica
tion signal to be sent automatically from the
called station to the calling station indicating,
for example, the name of the called station. The
name transmitter is generally brought automati
cally into operation at the beginning of the com
(Cl. 178-23)
brings about transmission of the “Who-are-you’
i
signal.
ZMS-controlled by a cam of the transmitter
shaft of the printer.
slcr and ska-the transmitting contacts which Ul
are actuated in phase with the signal sequence
to be transmitted.
ZME-controlled by a cam of. the receiver shaft
munication and sends out its signal one or more
of the printer.
VVD-controlled by the receiver on reception 10
of the “who-are-you” signal.
Kl--controlled by the receiver on reception of
times.
a special signal.
`
In accordance with the invention, the answer
back device is arranged not only so that it can
be brought automatically into operation on con
nection to the called station but also so that it
can be brought into operation at will through the
operation of key controlled contacts. The iden
tiñcation signal can then also be sent out by the
calling subscriber, for example, at the conclusion
of the communication.
,
The answer back device of the calling station
may be arranged so that it can be brought into
operation by a single depression of a key and so
that the signature of the sender can be trans
mitted at the end of the transmitted text. This
represents a substantial simpliñcation in opera
tion of the apparatus and enables good use to be
30 made of the answer back device.
An example of a telegraph printing apparatus
v
pap-_controlled by the paper ofthe printer. `
nslcr and mika-the “answer back” transmitting 15
contacts.
`
nhr and aha-_controlled by the “answer back”
device as long as it is driven by the motor.
11b-controlled by the “answer back” device at
the instant at which it is declutched from the
motor.
The apparatus is driven by a motor M. This
motor drives, in the transmitter, the transmitting
distributor shaft (contacts skr and ska) and in
the receiver, the not illustrated distributor for 25
translation of the incoming signal impulses and
the not illustrated printer.
Each station also has a time switch mecha
nisrn driven by the motor M associated with it
`which serves, among other things, for interrupt 30
ing the motor circuit should a given length of
provided in accordance with the invention with ' time elapse during which no signals are sent or
received. This time switch device is brought
an answer back device is illustrated in the accom
panying drawing. This shows the circuit dia
35 gram for an apparatus in a telegraph station SI
constructed to operate both as a transmitter and
as a receiver and for uninterrupted double cur
rent operation.
The connections at the station
S2 at the other end of the line L are formed in
40 the same way.
The various relay contacts are, in accordance
with the usual convention, designated in the
drawing by small letters corresponding to the
capital letters used to designate the relays on
45 which they depend. In addition` to the relay
contacts, there are also the following contacts:
ET-controlled by a particular transmitting
key.
p .g5 `
l
Unt! and UntZ--controlled by another trans
into the operative position by energization of. a
magnet ZS and the time is counted from the in
stant at which the magnet ZS is de-energized.
The station is also provided with an answer
back device of suitable construction which is
made operative by an energization of short dura
tion of a magnet N. The answer back device 40
may comprise a drum having cams distributed
over its circumference in a manner corresponding
to the signal characterizing the station to which
it belongs. These cams control the contacts
nskr and nska. 'I‘he drum is clutched to the
motor M by the magnet N upon a short energiza
tion of this magnet for a number of revolutions
during which time the contacts 11711' and nha, are
thrown. The drum is declutched automatically
at the end of these revolutions.
A contact nt is
mitting key.
opened for a short time by the drum shortly
.aa-closed by the “shift” key for sending a
“shift” signal and which remains closed until
the “shift back” signal is sent out.
before the answer back device is declutched.
wol-«controlled by the transmitting keywhich
The contacts sïcr and nskr of the transmitter
and the answer back device open in phase with
the signal transmission.
The contacts ska and 55
2
2,128,788
mslm on the other hand close a short time before
the opening and also open a short time after the
mains open, the contact slcc remains closed and
connects the spacing current battery E to the
closing of the contacts skr and nslcr.
rl‘he receiver is controlled by a polarized line
relay ER lying in the line L and influencing the
line L’ through the contact 3 of the key PT and
the contacts 28|, sp3 and ska and uhr. This
causes reversal of the contact er of the line relay
As the signal arrives for
The operation over the line L takes place with transmission at a time when the motor M at the
double current. In each station there is a mark
transmitting end is just starting, the time dur
ing battery e and a spacing battery E. '-'The‘ îfjing which the contact skï is maintained open,
10 positive pole of the marking battery oitheillus
.or ,the time during which the battery E is con 10
receiving magnet EM.
'
trated station is connected to earth which forms
ER in both stations.
nected, is much longer than it would be were
the return line; in the unillustrated station at the
the signals to arrive for transmission when the
other end of the line the negative pole of the motor is running at its normal speed. The con
marking battery is connected to earth in the same tact er is therefore reversed for this correspond
way. Similarly, the spacing batteries of the two Y ingly longer tima-both in the calling and in the 15
stations are connected oppositely.
called station.
Y
The earth connection for the spacing bat-V
In the called station, only the following circuit
teries E runs on the marking side of the‘contact
will> be formed:
pap, This contact is controlled by the paper
+, contact cr, relay EH, contact 232, -feed mechanism (not illustrated) in such a way
20
that it is reversed on interruption of the paper . The relay AEH responds and closes a holding cir
feed for example, in consequence of the failure of cuit over a. resistance by means of Vits contact
supply.
chl. The Contact chil is closed in order that the
A test key PT having contacts l-ß is provided holding circuit may be independent of the contact
282 but dependent upon the contact th of a ther 25
for-determining whether the telegraph appara
mo-relay ,TH which isV switched in by the contact
tus and its answer back device are in good work
ing order. This can be determined, for example, e713 to interruptthe holding circuit after a given
bycausing the transmitted'text to be recorded time. eBy means of the contact e115, an acoustic
only in the receiver of the transmitting station. signal is given by the bell KL or an optical signal
The remaining connections of the telegraph by the lamp ULwhich indicates -that a communi
cation is starting.. If a ' special code signal is
apparatus serve for ensuring undisturbed opera
.»tion. The apparatus operates in the following sent out. which reverses the contact kl in the
manner:
receiver of the called station, the indication Asig
The marking circuit» runs as follows: earth, .nal can be switchedin at will. This signal is'also
lbattery e >ofthe illustrated station, Contact I,
answer back contact nskr, transmittingY Contact
S761', contact 5, line relay ER, line L, and thence
>switcheolin by means of the paper contact pap 35
and acts as an alarm signal lshould the paper feed
fail.
Y
-
,
Y
to the identically connected but not illustrated
station» at the other end of the line and the
The magnet ZS in. the calledstation is con
nected to the source of current AS by means of
marking battery e connected therein in series . the Contact eh2- so that the time switch mech 40
40
anism also comes` intooperation in. the. called
and back to earth.
This‘marking current energizes the polarized
station and closes the contacts 281-283 and
relay ER in. such a way that the-contact er . reverses -the contact Vcs2. . The motor M in the
assumes the illustratedposition.
_ calledV station; is .switched in by theA contact 2s3
f 45
' When it is desired to- transmit a communica
`and, the- receiving magnet EM isV connected to,
tion from a calling tothe called station, the the ,negative terminalin a preparatory manner
switching in key ET on the keyboard of the trans „by the .contact 232 so that it responds on release
mitter of the calling> station is actuated so that , ottheline relay .-Elî'..v The contact cs2 energizes
a circuit is closed for the magnet »ZS of the time _ a relay SP of the calledstationin the following
switch mechanismas long as the key is depressed ' circuit:
and a special code signal is set up and transmitted
-, contact 282, contact e116, relay SP, +
- through the agency of the transmitter combina
The relayY SP, as a precautionary measure, closes
tion elements.
a. holding circuit by means ofv its contactsp‘ô.
The energization of thermagnet ZS, in a man
The contact spl short circuits th-e transmitting
ner which needs no detailed‘description, causes
the contacts 23|, 2.92 and 283 to be operated. The 'contact skr in the called station and, by opening
the contact S103, prevents the switching in of the
contact 253 closes the circuit for the driving mo
`tor M and the transmitting apparatus is thus Aspacing current battery E in the called station
made ready for operation. The contact 2s! pre ‘ through the Contact ska.
Finally, the contact $101!Y in the called station
paresv the connection of `the ‘spacing current
60
«battery E. The Contact 232 causes the negative prevents the magnet N which serves to bring its
current to iiow through the contact 'l to the answer back device into operation from being
energized by operation of the key contact Untl.
magnet EM which, therefore, responds but with
Thus, on energization- of the relay SP in the
. out as yet. causing anything else to happen.
During running of the motor M; the code signal « called station, no code signals can be transmit
vfes. which has « been, set 1 up by Y depression of the ted »from the apparatus to that station by oper 65
switching-in key ET is transmitted through the ation of a key.
`line L. This signal is preierably'a ñve-unit signal
The answer back device of the called-station
consisting. of a start impulsa'iive successive spac
can only be made operative by means of the con
current impulses and a stop, marking current " tact WD which is controlled by the receiving ap 70
vvo ing
impulse. The contact slcr remains open during paratus. When, after a corresponding signal has
the transmission both of the start impulse and » been transmitted from the'called station, the
of the five spacing impulses and is only closed . contactWD in the called station is closed in a
on transmission of the stop impulse. Through
known but not illustrated manner, the magnet
N>of the-answer back device is energized andr
out the time during which the contactY slcr re
3
2,128,788
brings into operation its mechanism for sending
back an identification signal one or more times.
Fortransmission of the code signal bringing
the answer back device of the called station into
operation, a character shift key, in fact, the iig
ures-signs key must first of all be depressed in
the transmitter of the calling station. The de
pression of this key causes the contact zz to be
closed until actuation of the letter key. The de
10 pression of the transmitter key which causes the
transmission of the who-are-you code signal
bringing the answer back device of the called
station into operation, causes a temporary closing
of the contact wd. The following circuit is then
15 closed in the calling station:
-, contacts ze, wd, sp2, relay WDV, -|A'holding circuit for the relay WDV is closed
by the contact wdvZ over a resistance and the
20 contact nt. The answer back contacts nsïcr and
nska of the calling‘station are prevented from
being effective by the contacts wdcß and wdvd.
This is necessary because the who-are-you code
signal bringing the answer back device of the
25 called station into operation also influences the
receiver of the calling station so» that the answer
contact Untl through the Contact spd and, by
means of the contact key Uni2, energizes the
magnet ZS as a precautionary measure in order
that the motor may be maintained in operation
while the answer back device is running down.
The called station cannot effect such a selec
tive bringing into operation because its relay SP
remains held up as long as the contact cs2 of the
time switch is thrown and makes the key con
tact Untl inoperative.
10
`
During ythe transmissionA and the reception of
each signal, the transmitting or receiving dis
tributor shaft is rotated in accordance with the
known start-stop principle, During each rota
tion, a contact ZMS or ZME is closed by a notch 15
in the shaft which energizes the magnet ZS of
the time- switch mechanism and switches this
mechanism back again into the starting position.
After transmission of the communication, the
time switch mechanism, unless again called upon 20..
for use, is reset into its normal position after a
predetermined time and its contacts asl-_253 are
thrown. The motor circuit is broken at the con
tact 283 so as to preclude operation of the time
switch through the contacts ZMS, ZME and Untl 25.'
which might be accidentally actuated and indi
back device of’ this station is also made operative
rectly close the motor circuit again.
by the contact WD of its receiver.
Now, the answer back devices of both stations
Uninterrupted double current operation is only
used for two-way traffic. For testing the appa
30 are clutched vto their motors. No signals are
transmitted in the calling station because the
contacts nslcr and nslca are made inoperative by
thecontacts wdvd and wdvß ofthe energized
relay WDV. 'The contacts nha. and nm' remain
actuated throughout the operation of the answer
back device of the calling station so that the
transmitting contacts skr and ska are made in
operative. ' The transmission of a signal is thus
yprevented if anî attempt is made to transmit one
y40 by depression of a key of the keyboard while the
'answer back device ofthe calling station is in
operation.
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"
ratus to see that it is in good working order, the 30
switch PT'is reversed and Single current oper
ation initiated, the contact 3 being opened so as
to disconnect the spacing current battery E. The
marking battery e is also disconnected at the
contact ll from the transmitting contacts nskr 35.:
and slcr but remains connected to the line L as a
source’ of `marking current through the make
before-break contact li, 5 of the switch PT.
During testing, the magnet EM is connectedA
40
directly in the following local circuit:
+, contact er, magnet EM, contacts 2, nslcr, slcr,
‘
B, cs2, -
In the called station, in which the relay WDV Y
is not operative, the answer back device sends out The testing can extend both to the transmitting
contact slcr and to the answer back contact nslcr.
45 the series of signals associated with the desig
nation- of the station or the like, a corresponding The contact nslcr can be actuated for transmis
recording being effected by means of the line re
lays ER of the called and calling stations. The
transmitted ktext is printed in both the calling
and the called stations by means of the magnets
50
EM.v Disturbances due to the rythmic throwing
of the contact er during reception of signals or
when signals are simultaneously transmitted and
recorded are prevented by the spark quenching
55
device Fu.
f
` The answer vback devices of both stations op
erate simultaneously. The identification signal
sent` by the answer back device of the `called
station is completely recorded by the time the
60 answer back device of the calling station comes
to rest. 4Now 'the ,contacts-uhu. and nhr of the
sion of the name automatically by closing of the
keyl contact Untl. Now, the energization of the
relay WDV effected on depression of the key wd
is ineffective because the contact wdvß has been 50
made ineffective by the contact l.
During the testing operation, the apparatus is
not entirely disconnected from the line. At the
contact 8 of' the testing switch PT, the relay EH
is connected to the spacing side of the operative 55
contact cs2 so that it can respond to transmitted
signals, for example, to a switching-in signal and
can close a holding circuit and can actuate the
call signal by‘means of the contact ehä. The re
lay SP is also energized and remains energized 60
when the testing switch PT is re-set.
calling station are thrown again and the contact
4 A special source of current having one pole
’ nt is opened for a short time so as to open the
connected to earth can be used as the local source
holding circuit for the relay WDV which thus
becomes (le-energized. It is then possible for
thetransmission of. the text to begin in the call
ing station.
After the transmission of the communication,
, the calling station, the relay WDV of which has
again dropped, 'can bring its answer back device
into operation byA actuation of the key contacts
Untl and Unt2 so that a series of code signals
serving as a “signature” is transmitted. The
v relay N of the answer back device of the calling
715 station is caused to respond by means of the key
of current for‘operation 'of the auxiliary switch
means. However, if desired, the source of mark 65
ing current e’ or a part of the source of spacing
currentE can be used for this purpose.
The provision' of resistances in the holding cir
cuits of the relays EH, WDV and SP serve the
purpose of reducing current consumption as far 70
as possible. The regulating resistance connected
to the magnet EM serves for adjusting the ener
gizing current to be supplied to this magnet.
The regulating resistance lconnected to the bat
tery E serves for regulating the current to be
4
2,128,788
supplied to the line. This current has to vary in
accordance with the conditions in the line and,
with telegraph operation over 'open lines, must
be capable of being iinely adjusted over a wide
range.
»
According to the particular operating condi
10
We claim:
'
Y
`
_
tioned switch
‘
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i
1. A telegraph system comprising a line and a
station at each end of said line, each station corn
prising a printing telegraph apparatus, an answer
back device., switch means for making said answer
15 back device operative and means adapted, on ac->
tuation by a signal received through said line and
also on actuation of a key of the telegraph appa
ratus at the station at which said means are lo
cated, to bring said switch means into operation.
2.' A telegraph system according to claim 1, in
which each station also comprises switch means
for preventing an arbitrary bringing into opera
tion of the answer back device under the influence
of la key of the telegraph apparatus of the same
station.
,
.
3. A telegraph system comprising a line, a call
ing station at one end of the line and a called
station at the other end of the line and a printing
telegraph apparatus at each of said stations, each
of said printing telegraph apparatus being pro
vided with an answer back device, with switch
means'for bringing said answer back device into
operation, with means responsive to a signal re-V
ceived through said line for operating said switch
means.
'
"
'
"
6. A double current telegraph system compris
'
tions, various of the described safety devices can
be omitted or can be replaced by other known
means.Vv
circuit, said switch being adapted on its actuation
to Vprevent .the answer back device being made
inoperative under the influence of said last men
ing a line, a calling station at one end of said
line and a called station at the'other end of
said line, each station comprising a printing
telegraph apparatus provided with transmitting
keys and adapted'totransmit code ‘signals to
said line and to evaluate code signals received
through said line for the selection and printing of
a type, a source of marking current, a'source-of
spacing current,ja line relay, an " answer back
device, switch means responsiveV to a signal re
ceived by said linefor bringing said answer back
device into operation, switch means responsive
to the operation of a special keyV of the Iprinting
telegraph apparatus at the station at which said
lastv mentioned switch means are located for 20
bringing saida'nswer back device into'operation;
and a switchVV for 'connecting said printing tele
graph apparatus >and said answer back Vdevice- in
a local circuit, said switch being 'adapted on its
actuation to >maintain ythe connection ofA said
source of marking current and'of said‘line relay
to
said
line.
'
`
‘
'
‘
"
7. A telegraph system according to claim 6,
in which each station also comprises auxiliary
switch means'adapted Yto 'becontrolled'by said 36
line relay and adapted 'on' its actuation to switch
ina call signal.
'
"
Í
'
ì
î
8.'A telegraph system according to' claim 6,
in'which each station comprises' auxiliary lswitch
36 means, with means actuated by a key of the tele
means adaptedto be controlled'by said lineY relay 35
graph apparatus at the station at which-said last and adapted to influence said switch meansfor
mentioned means are located for operating said' .making said answer'bac’k device operative, said
switch means, with means for transmitting a spe
switch means being operative also during> the
.cial code signal for bringing into operation the actuation' of> said switch> for switching~in saidY
answer back device of the'other station and with
switch means responsive to the transmission of
said code signal for cutting out said answer back`
device of the calling station on 'transmission of
said special code signal from the calling station,
45
to the called station.
'
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Y
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printing telegraph apparatus and saidV answeru 40
back device in- 'aflocalvcircuit '
'
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"
9. YA telegraph system, comprising af'line', `a
calling. station at -one end " of `-said line' 'and a
called Vstation avtithei rother‘end’of said line, Veach
station havinga‘printing telegraph apparatus
provi-ded with transmitting keysa'nd adapted’to 45
which each of said stations comprises a switch for transmit code signals through said line‘on actu`a-`
connecting the printing telegraph apparatus and tion of said keys and Ato translate codef'signals
the answer back device at that station in Va localV received through said line‘for'the selection and
circuit.
4. A telegraph system according to Vclaim 1, in
5. A telegraph system comprising a line and
a calling station and a called station at the ends
of said line, each station comprising a printing
telegraph apparatus adapted to transmit code
55 signals through said line and to translate code
signals received through said line for selection
and printing of a type, an answer back device,
switch means responsive to a code signal received
through said line and translated by said vprint
60 ing'telegraph apparatus for bringing saidan
swer back device into operation, switch means
operable by aY key of the printing telegraph ap
paratus at the station at which said last men
tioned switch means are ‘located forV bringing
65 said answer back device into operation, switch
means for rendering the answer back Ydevice of
y‘the calling station inoperative on actuation of a
key of the printing telegraph apparatus of said
calling station for transmitting through said
70 line a special code signal which causes the an-Y
swer back device of the called station to be made
printing of a type, each statiönbeing' also pro~> 50
vided withl anY answer back'device, vwith/switch
means responsive vto a signal receivedthrough
said line for bringing into operation said answer
back device, with switch meansV responsive to theV
actuation of a keyof the printing telegraph ap 55
paratus’at the station at which `-said last men
tioned switch means are located for bringing said
answer back device Vinto operation, with an- aux;
iliary relay a-dapted‘o'n its energiza'tiontoïclose
a holding circuit ' for itself andI with switch' 60
means, controlled by said' auxiliary”relay"on
reception of code signals sent through said line', .
for preventing an arbitrary bringing'into'ope'ra
tion of said answer backd'evice' on actuationïof'
akey.
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10. A telegraph system comprising Va line and a
station at each end of said line, each of said-sta#
tions having a printing telegraph apparatus'pro
vided with'keys and adapted to' transmit code
signals through saidlineon actuation of "said 70
keys and to translate code Vsignals received
through said line for selection and printing of a
type, each of said stations being also provided
operative, said switch means being responsive to
the transmission of said special code signal, and
a switch for connecting said printing telegraph
with an answer back device, with switch meansV
apparatus and said answer back device in a local
responsive to a'signal- receivedthrough said line
5
2,128,788
for releasing said answer back device, with switch
means responsive to the actuation of a special
key of the printing telegraph apparatus at the
station at which said last mentioned switch
means are located for releasing said answer back
device, and with switch means for preventing
the actuation of the transmitter of said printing
telegraph apparatus and of said answer back
device, means also being provided for controlling
said switch means in dependence upon the feed
10 of the paper strip in said printing telegraph
apparatus.
11. A telegraph system according to claim 10,
comprising also auxiliary relays, call signals con
trolled by said auxiliary relays and in which said
15 switch means for preventing the actuation of
the transmitter of said printing telegraph ap
paratus and ofv said answer back device are
adapted to control said signals.
12. A telegraph system comprising a line and
20 a station at each end of said line, each station
having a printing telegraph apparatus provided
with transmitting keys and adapted to trans
mit code signals through said line on actuation
of said keys and to translate code signals received
25 through said line for selection and printing of a
type, each station being also provided with a
line relay controlling said printing telegraph ap
paratus, with an answer back device, with a
motor driving said printing telegraph apparatus
and said answer back device, with means for
clutching said answer back device to said mo
tor, with automatically operating means for de
clutching said answer back device, with switching
means responsive to a special code signal received
by said line relay for operating said clutching
means, with switching means responsive to an 10
actuation of a special key of the printing tele->
graph apparatus at the station at which said last
mentioned switch means are located for operat
ing said clutching means, with transmitting con
tacts controlled by said answer back device, with 15
switching means responsive to an actuation of
said special key for making said transmitting
contacts controlled by said answer back device
inoperative, and with means, controlled by said
answer back device when said answer back device
is clutched to said motor, for preventing a trans
mission of code signals by said printing telegraph
apparatus on actuation of its keys.
MAX AMANN.
LUDWIG GÜNTHER.
ALFRED LAHL.
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