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Патент USA US2403682

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July 9, 1946.’
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.1
~
1.. M'; PQTTS
‘MECHANICAL
CIPHERING
I
‘v
~ '
SYSTEM >
' 2,403,682
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1 Q’ ‘ O’IfiginaII Filed ‘Oct; ’1.9',"1942 ‘ ' a SheetseSheet -1" I
FIG.
I<
CENTRAL‘
I
'INYENTOR
‘_
‘ ~ LOUIS M.POTTS f
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I
'
BY
‘ ATTORNEY
‘
July 9, 1946.:
1
I
1.1M. POTTS
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‘$403,682
‘
“ECHANICAL CIPHERING V SYSTEM
Origi?ai 'Fil‘ed‘ Oct. 19, 1942
' s Sheets-Sheet ~2
m"
v
IVNVEFIGYVTOR
LOUIS M. "POTTS'
-
ATTORNEY’
July 9,' 1946. ,
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-
.
'i
‘L... M. POTTS' Y’
.
-VMECHANICAL CIPHEVIRINGJ, SYSTEM
_
‘ Original Filed Oct.’ 19‘,- 1942
235
.253
22637 ~
2,403,682
‘I
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V
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i a Sheets-Sheet 4
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24%
222‘,
INVENTQR '_ ~
LOUIS M. POTTS
l
ATTORNEY
‘July 7‘), 1946‘
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‘
L. M. Poirfrs ‘ ,
MECHANICAL
GIPHERING‘
~ ' _
SYSTEM
‘
'
Original Filed Oct. 19) 1942‘
2,4035682
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>
'
v8 Sheets-Sheet e
‘
m'vsmon
I LOUIS u. POTTS
>BY
'
'ATTO
EY -
2,403,682
Patented July 9/1946
UNITED STA-T
" " “MECHANICAL‘QIPBEEING
,. .
zs'bassz
18mm, ~ '
to Tele? ’_
" Louis M. rotmnvnnton, in, asaignor
type, Corporation, Chicago, vIlL, acorporation oi I
,
Delaware
‘Serial No.
Orl‘inn
ap lica'tionidctober'lii, 1942,
462,522.? pDivided and this‘ application Septemé
"ber is; 1944, Serial No. 554,031
12
' (Cl. iris-L71)" "if ,
" code ‘combination, ‘etc. To, take a speci?c'illus
' This invention pertains to printing» telegraph’
systems and particularly to a systemv for. the. ,
transmission and reception oisecret telegraph
messages.
This application is
. spacingmarkin‘g, and spacing conditions; Let it
be further assumed that the key tape ‘with which, ,
a division
0! copending op,
v
plication Serial’No. 462,522, ?led October 19, 1942.
Secret signalling systemsv are desirable for,
the particular enciphering operation is to ‘be per
iormedbccupies a position whereat it is ‘condi
naval, ‘military and civil purposeslwherein it is
necessary that certain messages be rendered un-v
interceptible by unauthorized persons. The'sur
tioned for producing the letter ,‘KY” ‘combination
tively or marking, spacing. marking; spacing, and
10 which in t'he'Baudot code is composed consecu
reptitious interception of messages by unauthor'—‘
marking conditions. iUnderthese assumed con
ditionsthe enclphering operation would result'in
' ized persons might be accomplished, for vexample,
in the'case oi'lwire communication by tapping sis;
, nal wires or in the case of radio transmission by. .
receiving apparatuses tuned to the proper ire-e
quencies.
,
_
.
tration let'it be assumed that it is desired to en'
cipherftheletter "R" which in the Baudot code
is composed- consecutively ‘oi’ spacing, marking."
the production of an all-marking or “letters"
combination since in this case opposite conditions
of _.all the elements of the‘iR" and “Y” code:
_
combinations are provided. . This will be readily
Vernam Patent N0. 1,310,719, dated July '22, 1919, r - apparent from the following-‘chart wherein the
to provide a system for sending enciphered'mes; I letter?‘Mdndicates'a' marking condition and the i
.
sages in which the the unit Baudot code is em-_ m letter 5 indicates a spacing condition.
. _ It has been proposed as exemplified by the" G, S.
ployed. ,In general, the cipheringsystem .de-f
scribed in the Vernam patent utilizesan arrange
ment wherein one set, .of ‘me contacts are con-‘
trolled by. ‘either enciphered for original signals
,
;()rlgihal
l“l1" ................ ..
........ .. ....... _.
and a second set of ?ve contacts are'controlled by uKeyslgns‘W'LJ.
, Resultant enoiphered signal, “Mme
key signals provided through .the instrumentality
of a key tape. ‘The two sets of contacts are op-‘
erated in synchronism to control iointlysa' setoi
?ve relays in order to encipher or decipher mes
'M'
s
s
M
M
s
s‘
M
vM M M M
z = It v‘is toibe understood that both the transmit-'
and receiving. ends of a‘ telegraph line will be
equipped with identical key tapes, which during
, sages according to the direction of transmission. so
‘ ,messagetransmission will-occupy identical posi
As is well known in‘ the printing, telegraph art ~ tions during each signal interval."-' A station which
the individual code combinations of the live unit I receives‘enciphered signalsis thus enabled to de
Baudot code are made up or a series of marking . , cipher the ‘unintelligible signals transmitted over
and spacing impulses which are customarily in‘ a the telegraph line by combinins the enciphered
the form oi’ current impulsesrepresentativeoi 3‘ signals with the: key signalsprovided-by its key
tape. To illustrate a deciphering operation the
resentative o! spacing 'conditions.. In 'starte'stop' ' example given above in connection with the en-,
telegraphy which is, herein employed the iive unit
ciphering operation willbe continued and it will
code is'preceded by a start or spacing 'impuls'ea'nd ‘'0 be assumed that a receiving stationreceived the
followed by a stop or marking impulse.‘
'
- . ' .enciphered signal; namely, "letters.” The "Y”
" In order to encipher messages by the system or
combinationp'rovided by the key tape at the re
the present invention‘the elements'oi'the original J ceiving station can now be combined with the
code combination are combined with the elements _ r‘.‘,letters",' comblnaticu to decipherthe enciphered
’ marking conditions and nocurrent impulses rep
otj code ‘combinations provided ‘by a key tape.
signal to thereby reproduce-the. original signal '
In this ‘arrangement opposite conditions, thatgis, 46 “R” as clearly shown in the following chart.
with one element of the original code combination
marking and with one element oi?the key code i T
H1
‘s 4.
combination spacing, produce a‘ marking signaL.
Like conditions, however, that is with, both ele
ments marking or .both elements spacing,'produce
M
M is‘ h t‘ h
0riginaisignal“BV’V’._..>_.-' ............... ..»..~ 8 NZ .5 M S
spacing signals. ‘This presumes,‘ of course, that
each of the elements or the respective code coma
The‘ use of ‘mechanically controlled and op
'binatlons are related'to each other. Thus the
No.1 element or the original code combination ~ 'erated signalling arrangements have demon
torem-aw.15112221'111::1;:1
.
67
is combined with the No. 1. element of thekey ssstrated advantages not obtainable‘ in systems
2,403,682
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a
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4
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will be contained in a small portable receptacle
that may be conveniently, carried for use at loca
tions having standard printing telegraph appara
which are for the most .part electrically con
trolled. Electrically controlled systems which
usually include receiving and transmitting com
mutator distributors and relay controlled contact
tus. A set of plugs are included with the unit to
arrangements, while advantageous for certain re
enable the unit to be quickly and easily associ
quirements, do not operate with the e?lciency and .
ated with standard telegraph apparatus.
comparatively slight maintenance afforded in me
chanical systems. A mechanical enciphering ar-_
fromthe following detailed‘ description and the
The ‘invention may be more readily understood
' rangement employing permutationcode combina
tions with its attendant advantages over elec
drawings wherein!
10
trically controlled systems has thus far not been
' proposed. Mechanical enciphering systems are
‘
‘ Fig. 1 is a-simpli?ed diagram of two outlying ‘
' stations associated with central o?lce exchanges;
2 is an illustration of a portable ciphering
particularly desirable for the transmission‘of ‘
' unit embodied in the present invention included '
in a carryingcase; . .
secret messages wherein it is advisable that sig
nal distortion be kept to a minimum and that l5
Fig. 3_ is a front elevational view of the main
maintenance troubles do not delay communicat
' embodiment of; the invention, partly insection
ing operations. .
and partly broken; away for the sake of clarity.
Accordingly the primary object of the present .
Fig. 4 is a fragmentary perspective view of a
invention is the provision of a simple, reliable
portion of the starting mechanism embodied in
and practical system and apparatus for render
ing messages unintelligible tounauthorized per
the present invention;
sons.
tus shown in Fig. 3;
Fig. 5 is an end elevational view of-the appara.
"
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-
Another object of the invention is to provide
Fig. 6 is a detailedperspective view of a direc
a system and apparatus for precluding the un
tion switch used in connection with the inven
authorized interception of messages by mechani 25
cal‘ operations established ‘in response to the ‘re
Fig. .7 illu'stratesthe circuit employed in the
~ tion;
spective control conditions.
a
.
main embodiment of the invention;
vA further object of the invention'is theipro- ‘
>
Fig. 8 is a detailed view of a portion of the start
vision of a portable mechanically operated cipher
ing mechanism, another view of which is shown‘ in
ing unit which may be readily associated‘with 30
standard printing telegraph apparatus used for
Fig. 9 is a sectional view of the clutch release '‘
Fig.4;
telegraphic communication.
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h,
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An additional feature of the present invention
ing
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_
mechanism;
‘
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ing mechanism;
'
mechanism;
'
‘view of‘the tape feed
.
.
'
Fig’._13 is‘ a view illustrating the operation of a
' 40
Other features and advantages of the inven
tion will appear as the description progresses and
code bar:
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‘
Fig. i4’ is a detailed view of the tape feeler bail;
Fig.‘ _15’is a front elevational view of a modi?ca
accordingly the invention should not be limited
by the speci?c recitals appearing above.
The invention herein described utilizes a port
V
Fig. 11 is a detailed view of the stop bar operat
ing
is the provision of .a mechanical enciphering unit
_
Fig. 10 is a detailed view of the start bar operat
' Fig. '12 is a fragmentary
' '
in the form of a regenerative repeater.
.
bail, taken on line 9-. of Fig. 5;
‘
A feature or this invention is the employment
of directional "switching means for automatically
conditioning a cipheringv unit for either encipher 35
ing ‘or deciphering operations dependent upon the
direction of transmission.
.
tion of‘ the invention;
‘
>
Fig. '16 is an end elevational view ‘of the modii'i
45
cation ‘shown inFig. 15.
I 1
h
'
Fig. 1'7 .is a circuit diagram :er use with the
able mechanical ciphering unit in the form of a '
regenerative repeater resembling the regenerative
modified form of the invention; and
‘Fig. 18 is'an alternate‘ form of clutch release
- repeater illustrated in Patent No. 2,105,173 to W.
J. Zenner et al., dated January 11, 1938. The unit
mechanism.
includes a signal transmitting contact lever op 60
;
g
,
Referring now to the diagram shown in Fig.
erable sequentially by a series of selector bars in
accordance with the joint control exercised‘over
i there is pictorially illustrated portable ciphering
units Ill shown in enlargement in Fig. 2 which
- the bars by a series of levers which may be under
.mayby plug connections, be readily associated
the direct control of a key tape or in a modi?ca- - '
with‘ standard printing telegraph units II and 22
tion of the invention under the control of a set of 85 which are respectively connected with central tel
egraph ofiices or exchanges 23 and- 24. At the
?ve code magnets and a single armature lever
’ controlled ‘by a selector magnet which may re
' . centralo?ice 23 there maybe provided a'printing
telegraph unitfilvrlth'which th'ereis perma
spond to either enciphered or deciphered signals.
It is understood, of course, that other equivalen
means of control may be employed.
-
'
nently associated a ciphering unit 26.. This illus- .
613 tration is, of course, merely exemplary however
and instead of being connected injan exchange,
the units II and 22 may if desired be connected
‘directly or permanently to each other. The port
able unit 20 may be readily carried in its carry
ing case}? so that the unit may be conveniently
used at different locations, where ‘standard print
The proposed construction includes a complete
circuit system for operation of the unit which
controls directional switching means for auto
I matically enciphering or deciphering messages de
pendent on the direction of transmission. In one
form of the invention a‘ direction switch bar is
ing telegraph apparatus isavailable.
'
employed which is operated either to one. of two
By reference'to the drawings, the main embodi
positions depending on the direction of' the sig
ment. of the invention will now be described in
nals. The second form of directional switching
employed features the use of ‘a contact operating 70 detail.’ In Fig. 51's illustrated a motor‘3l which
by gear 32 drives gear 33 to which there is ?xedly
lever ‘having a pair of transmitting contacts and
a switching system which renders one or the other
secured a relatively long operating shaft 34. The
oi the contacts effective for transmission accord
shaft 34 is journalled at one end in a, bearing 35
ing to the direction of signalling.
,
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' All necessary equipment for the ciphering unit
15
which is ?tted in a frame 36. A bearing ‘31 car
ried by bracket 38 attached to‘ the frame 38 also
,
a.
.
2,403,082;
be againl-stoppedgwhen' thestopj arm once more
supports the‘ shaft 84.“ A" cam sleeve 4l=freely -
mounted about shaft‘ 34 has assembled v‘upon it a 1 abuts against the notch 84 ofthe gate ‘latch 88.,
'
‘
Positioned-below the‘ cam sleeve‘ 4| is a‘ series '
- stop arm 42, a ?utter cam- 43 and code bar oper
of five ,codebars 85 which are mounted for‘ slid
ation cams 44 to 48 inclusive. Also-‘carried by .
cam sleeve 4| is'start bar ‘cam SI and stop bar; 1 able and pivotal movement within the comb mem
cam 52. In addition thereto cam sleeve 4| car; ' ‘ bers‘88.' 'Al-series ‘of springs 81 normally‘. urge
their associated code bars 85 upwardand to'thev
ries direction control bar cams 53 and" best
rightehand position asclearlyillustrated in Fig.
illustrated in Fig. 6 ends clutch‘ release came“. "
18.‘;
comb members 88 have alsoimounted'v
thereiniaistart bar 88 and a stop bari89 (Figs. 5,‘
- v The right-hand end of cam sleeve“. asviewed.
' in Fig. 5 consists oi'fan integral discv flange“ and - 10
1.0,v and_"1l;).-, The‘ start bar 88 islmounted for
‘the opposite'end of the sleeve supports a'?anger ,_
51 threaded thereon. "At the'correspondingend
counterclockwise pivotal movements as viewed in
Fig, ,10 about the post "and is provided with a 1
" bifurcated ‘portion 82 for engagement with they ‘
of shaft 34’. is ?xedly securedal?ange ‘disc 58.’ .
Between flanges 58 and 58 isepositioned "a felt trio-t
tion member 58s At the intermediatefportion o'if
post ‘81.- ‘The bar 88 is normally urged in a clock
wise direction aboutpi'vot 8| by aspring 93. The
stop he;- 88 is arranged ‘I01’ clockwise».pivotalv
' shaft 34 a sleeve “which carries‘fa ?a'ng‘edpor-v.
tion 62 is mounted for 'a slidablem‘ov'ementtby ._ I
' movement,‘ as illustrated in Eig.,l1 about-its ,as-,
means of a, splined connection with‘ adjustable
nut 48. Interposed between- ?ange discs 62 and " ' sociatedbifurcated'tportion 84 which engages'post
- 51 is a friction felt member 83. Secured to the‘ '20 '85. 'A-spring“ 86 normally urges the'stop bar 88
shaft 34 is the adjustable nut 48 which bears _ in acounterclockwise direction.
against a compressionspring 58 to urge the spring _} *In“ addition to the code bars “(the start bar
88 and ; the stop ‘bar 88,.ithe , comb v'mernberaj”, ,
against the ?angedisc 8? thus to urge the entire '
alsom'ount a directionyswitchy bar, 81 and edited
sleeve v4| to the right as viewed in Fig.5; ; ' > v
I
> In Figs. 4 and 8 the start mechanism is il1us-' 25 tion, control'bar 88 bestillustrated in Ei'gl‘?;
_ code bars 85, the start bar 88, the_._s‘top188,¢and ‘ '
itrated which permits‘ the rotation of :the cam
- thevcontrolbar" are all operable by associated; »‘
sleeve 4! through the slip‘ friction clutch arrange
‘IT-shaped operating levers. "which are pivoted
ment provided by the friction felt members 59 and
88. :Astis well known in the,‘ printing'telegraph- . - about shaft m and controlled byytheir respective‘ . "
art,‘ cam» sleeve 4| is released for rotation upon 30‘ .carns. ~ 'Theruppe'r portion of each 'T-lever is in j
engagementawith ' its. associated cam ‘ands-1 the.
‘ lower portion‘, of eachlever is inJ-bearingengage
there'ception of the start impulse which precedes‘ , >
the‘ ?ve unit , code combination and ‘is ‘stopped
ment" with its associated bar. » '
' upon‘ receipt'of the stop impulse'which is re- '
‘ ceived after the .completion'ot the live unit code’ It _ - The purpose'tof the: direction barél‘l
‘
'tolcon'dition the‘ direction switch I" according '
combination. As will be further described in de
tail either a selector. magnet‘ 84- (Fig 4).,oria start
to the direction of transmission. ‘When
switchnllic; occupies its '; normal position to ‘the I 1
' magnet. Gamay receive the start impulse in order
is in‘position torocont'rol the 'encipherlng
to release the cam sleeve‘4l'. According tolls.‘ ‘,r-lefthit'
and retransmission ‘of Iolltgoingf'rnes’sages ‘01131;.
3 armature lever 85 of selector magnet 64 is-piwv 1
is located,-ywhereas whenit isrmoved' to the right
wise ,direction by a spring 88.’ Armature lever
it is ‘in-a position to- control the'deciphering
"oi!
, .
V 68 associated with the start magnet 85 is pivoted
" incomingmes'sagesg The control‘bar 88 normallyv ’ is urged to the'rightand in an'upward direction
about shaftnlq '(Fig. 5) andlikewise normally _is
_ urged in a counterclockwise direction ‘as viewed in -
by spring‘ I 82’ and the bar-.88 may pivot in either >
Fig. 3 by a spring ‘IL, Armaturelever 68 carries"
av clockwise or ;a-gcounterclockwisev direction as ,
a laterallyextending projection 12 (Fig. v4) ._en,-' .
will immediately hereinafter appear."v The resil
- gageablewith‘ an ‘adjustable screw, ‘II, of'stop lever »
14, which is pivoted about the stud 15,,upon'de‘;
gvv
nating at-ithestation whereat the'c'iphering unit = , 'Y "
oted about shaft 81 and is urged inv counterclock
‘ iency of the contactllsprings associated'lwith the ‘ '9'
energization of selector magnet 84. .Likewise'ar
r
mature lever "associated with startmagnet?
60
‘ direction switch l?lsu?ices normally ‘to urge the ',
direction-bar“ to the left or transmitting posi
carries a» vertically extending portion 18, which '- >
tion due to‘ the‘ engagement of- the lateral projec
'
engages an- adjustable screw 1]; mounted-onthe
stop'arm ‘14. , Itis, therefore, obvious that de- -
‘_ when signals‘ are, outgoing from the associated‘
energization
a. clockwise of
movement'ot
either magnet
the,
'84 stopvarm
or 88 may "Hash
-viewedin1"ig'.4.>
.
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“
"
‘station apparatuathe selector magnet 84 receives
a spacingv orf noecurrentstart impulse therefrom, >
‘
Clockwise vpivotal movement'oi' stop,-leverf"|_4*v I
' vthereby
away iromtheiselectormagnet
enabling the‘ armaturein
lever
a counterclock88 tomove ' ' -4'
will causeits projection l8 to'bear against’ a pin H
member 38 vtooperate va bell ‘crank 40 (Fig, 8)’ v
T wise vdirection as viewed in Fig“.v_3., - Whenfthis ‘ '. v
voccui'sxthe upper vportion'oi the armature lever 1
ilwill'niove frombeneath the notch portion I88 _.
which is pivoted at 18 to‘thereby cause clockwise;
‘ pivotalv'movement' oi’ lever 18 against: the in?u
ence of its compression spring 8|. At its lower
' ' lowerportionof
of
4i starts
the icontrollbar
rota 'on,fa's_
the as
control
previously
‘directly
ban,
explained,"direc-v
toAs
vunderlie,tire
cam sleeve 'I ‘I_ 7
end lever "nv has a. notch 82 which in ‘the stop
position oirthe- apparatus locks agate latch ,83
pivoted'at 88. Latch 83 carries a notchedapor
~65
‘tion' control camjtwill operate its ‘reshaped op
" ,
' eratin'g lever '88 to move the lever inr'acl'ockwise _
"tion 84 which‘ is'normally in blocking relationship
jdirectionas'shown'in Fig.6.‘ The lower portion ,ot?the T-leverpushes against the controlbar 88., ' .1
.above described operation takestplacqthe notch; ‘ Sincethe‘upper portion‘ of the armature lever is _
82 of lever 18 moves out offthe path‘ of gate latch 70 now‘in blocking relation with the. control ba'r'll ,_ ‘
with the aforementioned'stoparm 42 whichis _
' ‘?xedly secured to jthe_,can11s1eeve,4|. 'When-the
-
r the control bar will be moved‘ in a, clockwise ,di- j
~ 83 and the stop arm 84 ,isnowenabled to overcome v ' a Y rectionias' viewed in Fig. )6 ;’= that is, the right-hand ‘Y
the ior'ce'of a spring“ associated‘vwith the gate a
latch due to the greater force exerted against 718 ‘I Ia
' notch 84- by the stop arm'42. i The cam sleeve
is ,
vend'of bar, 88 will move downwardlyv vThis will; 2 :
have .no2e?ect upon the direction‘ switch, Hill in- _. ‘
“th'us enabled tomake' a Sin81e‘1‘eV01lltiOnjal1d1-t0 , 75; asmuchzas itis desired at this time to ‘allow the
2,403,682
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direction switch to remain in its normal trans
, mitting position.
-
1
there will be no interference with the upper por
tion of the selector ‘magnet armature 55.
However. when signals are incoming from a
' Code bars 85 (Fig. 13) may be freed to shift
remote station, start magnet 55 will receive a
to their marking or right position under the
start impulse of no-current or spacing nature to
in?uence of springs 81 by means of tape feeler
levers I25 in accordance with the permutations
setthe sleeve 4I into rotation. Under these con
sensed in a key tape I25 (Fig. 3) by feeler pins
ditions-the selector magnet 84 remains energized
I21 which are carried by the tape feeler levers
andconsequently its upper portion,‘ continues to
I25. Tape feeler levers I25 in their non-sensing
‘underlie the ‘notch I55 of the direction control
bar 55. Therefore, when sleeve 4| is released cam‘ 10 or clockwise-position as viewed in Fig. 13 bear
55 operates against its T-lever 55 thereby to tilt , against the projections IIII of the code bars 85
to urge the code bars to the left against the
the direction control bar It in a counterclock-~
in?uence of their associated springs 51- The tape
wise direction about rod 8| asa fulcrum. when
feelerlevers I25 are pivoted at I50 and are urged
this occurs the control bar strikes the lower arm
of a bell crank member .I II which is pivoted at 15 in a counterclockwise direction as viewed in Fig. 3
.by springs I25 so that when a perforation is
I", thereby causing the bell crank to rock in a
sensed by a particular feeler lever its feeler pin
clockwise direction. This causes the vertical arm
may‘project through the tape due to the force
.0! the bell crank to engage thebent over ?ange
portion I55 of the direction'switch bar 51 thereby
‘ exerted by spring I20.
shifting the direction switch bar 51 to the right. 20 To control the operation of the key tape mech
anism there is provided a second cam sleeve I3I
Whenthis occurs the?ange portion I” of the
which is ‘mounted upon the shaft 54. Sleeve I3I
direction switch bar 51 engages the insulating
portion m of switch ‘m to operate the'switch ' carries an integral collar I52, against which abuts
to theright-hand position as shown in Fig.6.
one end of- a compression springisl, the other
Substantially simultaneously with the operation 25 end of which is in abutting relationship with a
collar I“ of sleeve I35 which has a splined'con-v
cream 52 to depress the lever 55, cam 54 also
nection with the sleeve III. Spring I33 tends
carried upon sleeve 4| operates'to release‘the bell
crank latching lever I" (Fig. 6) which is pivoted } to urge the collar I“ to the left as clearly illus
at Ill and is normally urged into operative rela
trated in Fig. 5. The sleeve I35 constitutes the
'tionship with the cam byv a spring III. The bell 80 driven portion of a positive clutch indicated gen
crank I" has a'horizontally extending latching
erally at I35. vThe sleeve I35 also carries a cam
arm II2 having a downwardly projecting point
stoppilm surface Il‘l which cooperates with the
which is adapted to engage'notch H3 or the di
extension I35 of the clutch release bail I39 which
carries outwardly extending pivot arms “I (Fig.
rection switch bar 51 when the switch bar is
moved to the right, as just explained. The arm 35 9) supported on the pivot shaft I52. A spring I“
normally urges the clutch release bail ‘in a clock
wise direction as clearly shown in Fig. 9 by its
‘"2 of bell crank illtherefore is‘ immediately
released uponj'the rotation of the cam‘ sleeve 4|
and thus latches‘ the bar 51 in its right-hand
‘ attachment to the tail portion-I“ ‘of the ball.
positionduring the reception of incoming signals
The extending arm I35 in the stop position of
from the'remote station. Near the end 'of its 40 sleeve‘ III is normally in blocking relationship
revolution. cam 54‘ operates. again to move the
with respect to the stopping cam ‘surface II‘!
and therefore urges the sleeve I35 to the right
bell crank Ill in a counterclockwise direction as
viewed in Fig. B’thereby to release the projecting
as'viewed in Fig. 5. This maintains the driven
portion In from‘ the notch u: of the direction
portion I35 of clutch I25 out of engagement with
switch bar 51. The direction switchbar 91 ac
the driving portion I45 of the clutch which is
cordingly is shifted to the left under the in?u
?xedly ‘secured to'the shaft 24. Ball I39 also
carries a projection I56 for following engagement
ence of the contact springs of switch I00, which
areqin a flexed condition when the switch is po
with cam 55 carried by sleeve ‘I.
‘
When'the sleeve 4| has almost completed its
sitioncd to the right.
, _
Positioned below the code bars 85, the start bar 50 revolution and'iis about to‘ cause the sending. of
55-," and ‘the ‘stop bar 89 is a substantially Y
the ‘stop impulse, as will later appear, cam 55
'shaped retransmitting lever I“ (Fig. 3) which
will function by its engagement with the follower
has laterally extending projections I I5, I I5, which
arm I45 to tilt the bail MI in a counterclockwise
' underlie all of the just mentioned bars.
An in
direction (as viewed inFl'g. 9) to release the pro
sulated contact arm I" is attached to-the pro 55 jection I28 from the path of the cam stopping
Section -I I5, which operates transmitting contact
II
The Y-shaped lever II‘! is pivoted at point
wise'or clockwise position and be retained in
surface I 51 of the driven sleeve I35 of clutch I35.
This enables the spring III to shift the clutch
member I35 to the left to enable the positive
engagement'of clutch I 35 to release sleeve III
either position by the‘jockey arm I2I pivoted at
for rotation.
' II, 'and may be moved to either a counterclock
Sleeve I3I carries thereon a tape '
I22 and normally urged in a counterclockwise
feed cam I5I and a feeler bail cam I52. As sleeve
I3I rotates, feeler bail cam I52 operates to permit
direction (Fig.3) by a spring I23.
a follower I53‘ of tape feeler, bail I54 pivoted at
-When cam sleeve 4| is ‘started into rotation, the
direction switch bar 91 is operated‘as indicated, 65 I80 to move in a clockwise direction-under the
in?uence of spring I55 as, clearly depicted in Fig.
and invariably start cam 5I (Fig. 10) operates,
14. This operation removes the feeler pins I21
by‘ means of its T-shaped operating lever 99, start }
from the holes of the tape I25 due to the engage
‘bar 55 which is rotated in a counterclockwise
ment of projection I'III of the‘ feeler ball with
‘direction about pivot 8|, thereby causing the
feeler levers I25. -With the feeler pins 12‘! mo
‘lower portion. other 88 to contact the arm H5
mentarily held in this position cam 'I5I operates
of the Y-shaped lever II4 to tilt the Y-shaped
against the follower I56 of atape feed bail I51
lever'I ll in a counterclockwise ‘direction where
pivoted at y I", which under the in?uence of
' upon contact arm I" is operated to itsyupward
spring Iii-rotates bail Iii-in a counterclockwise
or spacing position. The start bar 88 has a com
direction as viewed- in Fig. 12. This causes feed
paratively large notch, I25 inorder to insure that 75 pawl m which is pivoted to the'bail at m to '
w
I
2,403,882
‘
'
{"10 F
T
=pulled upiits armature lever 86 so that the aims.
advance the feed ratchet I52 one step.= Feedp'awl?
ture ‘ lever ' is, in , alignment with the notch ‘50 of
I59 is urged against the teeth of thelfeed ratchet ‘
the No. 1 selector bar-85,,‘ therebeing; a similar
onall of the other, code bars 85. ,.The No.- 1
Cam I 5|:next acts againstjthe follower v-I:58-to' ' notch
code bar operating cam 44 will at this timeoper;
rock bail I51 in‘ a clockwise direction to bring
' by means of ‘a spring vI63.
' ate‘its T-shapedop'erating lever 99 to cause the .
back the stepping ‘pawl I59 ‘in’ positioniiori the
next; stepping: operation; . Immediately after this
depression and pivotal movement ‘of thelNo.» 1
codebar; 85. Since notch?llris alignment with
operation cam "I52 operates ' against "theiiollower
‘ , the upper portion?‘ of armature lever 88 theibar
I53 ofthe tape feeler bail] 54toperinit thefeelers 10
will 'pivotvabout the "post 9|‘ ‘causing thebar 85
I21 to sense theltape;
to engage "the; projection , I I5: of v the .Y-shaped
alternate form ofclutch release'mechanlsm
.rprovided
is shown" betweenthe
in‘Fig. ‘ 18, wherein/an
cam ,-55 and
interpon'ent‘
the rfollower'
lis - counterclockwise direction; to cause the vcontact .
‘ armsII‘I‘ tot-move to its up orj-spacing ‘position. "
15 At. this time lockeyrarrn I2I “will hold the‘!-v
arm I45 of the form of‘clut'ch release mechanism ‘
shown in Fig. 9, Referring toFig. '18, theclutch
‘release bail 539 is‘ provided with‘ a-p‘air‘ of- pivot‘
shaped lever H4, in its selected position.’ It will
' be understood howeverstha'tiwhen the vY-shaped .
_ arms '54I; supported on the pivot‘ shaft“542.~-A., ‘
H4 has-previously beentilted'to' the desired
spring 543 normally urges the clutch releasebail ij ‘ lever
not need tob'e again shifted.
in a vclockwise direction by its att'achmentito the ' ‘ positioniit
It is thus readily K apparent‘ from‘the above de
tail portion 544 of the'bail v539. ‘The upwardly 20 scrlption
‘that - whenever a tape 'feeler lever" I25
extending arm~538is comparable to farm'l38 of
I
is in its marking position and the ‘selector \armaq
the form'shown in Fig;9;-andserves-toimaintain ‘ -‘
the drivenv portionv of the clutch-flout offengage
mentwith the drivingiportion thereof vduring stop
intervals. The‘ bail 539:1is also provided with an;
" tureglev‘er is also in its‘ marking position that a
spacing signalfwillbe sent by the retransmitting
contact arm I l 1., ; In response to a spacing condi
arm 54-5," (comparable"‘to1arin“'I48’) {which in the j
present instance isfnot‘l'directly .cooperable with
cam 55,‘ but‘ cooperates therewith lth’rou'ghithe
instruinentality "of an interponent '55I depending
tion,ithezfeelerlpin I-Z‘lwillnotiind aperi'oration I '
>_ in the tape andghence, bar 85 will remain lnits .
“leftward position, as viewed in Figs. 3 and: 13. ' 1 Also, the-selector. magnet 85 will he de-energized, - '
and its- armature Iii-will be biased to. its counter-'
from a bell crank"'552 pivoted at 5531 ‘Bell Acrank‘ 39, ,clockwise-positlqn
by spring, 68pwherebv the
552 is held in its clockwise “or counterclockwise
' notch L90“ of bar 85 will ‘be'aligned vertically with
position by a detent 554.‘ When*bell'crank3“552 ‘ ‘
ireeend of armature qlii-ivfi'husé itis further
is in its clockwise'p'osition‘(shown'l in Fig.~-18), . ‘the
apparent/‘j that when \bothjv'sthe ,iitap'e feeler lever
_ "
the interponent55l is operative between‘camP-55 .
and arrh'548 to tilt the bail 539 cyclically tofe?'ect ‘
_and,..its-_»particularly;associated code ‘bar are both,
win the spacing position .thata, like condition will
andthecontact operating arm II ‘I wlllbe
of theclutch elements} on vthe other hand; when; _‘ ‘- ‘occur
tiltedjin {a counterclockwise position to its up or
, , the release of stop arm 538 to permitengagement
v
the bell crank 552 assumes" its counterclockwise: ~ " “spacing position , since the ,V upper‘- extremity of
position _"(by ‘manually operatingithé “vertical arm {armature lever “will beoppositefa notch?q of a of the bell crank), the int'e'rponentl55l “will-be ' code bar 85.1 "When, however; opposite conditions
raised out of cooperative‘ relations with“ canr'55 l,
exist} between the selector lever‘IiG? and a particu
and arm 546, thus renderingbail 538no'nl‘opera
..lar code'barj 5, the particular; code bar'will pivot '
tive. In the latter position _of the bell‘crank=,'_the
repeating mechanism beco'ines v'i'iplain regenera
tive repeater by renderingthe tape stéppi'nglan'd
sensing elements,non-operative,‘ i
in‘ a- clockwis‘e‘direotion due to the blocking condle
45 tion obtainedby the upper extremityv oi’ the se- 1
.leotorjarmature lever 88.- In cthervwords, under
this last qmentioned‘condition“ the notch-90 of
the particular code bar Operated will be offset
- s'
The mechanical ciphering operation-oflthejcode
bars 85 will ncw‘be described.- ‘It has been-Dre. "wwith respect to the upper extremity?‘of the armae viously mentioned‘that “the present, ciphering
56 so that the upperT portion of the.
1 system was predicated‘ upon ‘the use'ct ‘combined col'tureilever
lever acts as aiulcrum point, and when the as
signals provided by a key tape anda selector ma8- _ ;sociated ,T-leverjs? is}, operated, the particular
net in which opposite conditions of the individual
code har‘will pivotin;a»clockwlse direction to
. elements of the 'code' combination produced"
marking conditions; while. like conditions “such- as
both marking" or‘ both spacing produced spacing 55
' impulses. 'With- this system in mind the. descrip
,engage‘the ‘projection 'I I5 of .Y-shaped lever II4_ ,
‘thereby to positionthe contact operating arm} I I1
Jot‘ aimarkingroperation, unless, of course, it has
already , assumed v~‘such position in" va.‘ [preceding
tion will proceed. ‘In order to describe this phase
_, 'of the ‘invention it will be i/pre‘sum‘e'd that thefcam - ' \ The upper portion of selectcr armature lever‘
sleeve 4I' has been released Hforfrotation' by ,re- ta
I59‘, Fig., -13,
while
.
,
. ceipt of the start impulse and that the tape I264 ‘6o;’ 88,;lsibeve1edaspindicatedat
each code bar 85 has formed thereon a‘grooxfe
occupies a nhw position as has“'iu'st been deV-~ 1 I'8'l’7. This arrangement insures the locking
.code;'combination~..
scribed above‘, and "that, the 'reeie'rpmshlzrare
‘
-
-
‘
a
selectorilever 86- ‘during a marking operation
‘ now conditioned 'for?a‘s'en'singoperation.‘- 'Ifthe ‘
No. 1 i'eeler pin of thejpins I21should~now be ~
sensing, a perforation,‘ its vassotiiat'mi- ‘ieeler lever
I25'would be urged in a counterclockwise direc
1
when apartlcular code bar, 85 pivots in‘ a clock
65 ' wise direction, I as ‘previously explained,v and thus
tion‘ by spring I28. ' This enables the No. 1" code .'
gives the so-calleclknifeedge selection. When
vah'spa'cingpperation; ‘takes place, however, the.
armature lever 168,-? engag§§,._in the-notch 88 P110,
bar 85 to be pulled to the righta's viewed in Figs.
Jvided
by this, particular codebanand is,lxthere
3 and 13 and underthe influence of spring B‘Ldue'
g to the removal of theieeler lever from projection» 70-1; foreprestrained from movement so. that no spe
IIII-of the code bar; ' This sensing-ofaper-foraé
tion indicates a marking ‘condition inthe; No; 1
, element of key tape "I26; If the selector magnet
‘ 'cial' locking; means is needed;v
1* After every ?ve unit combination -,is trans
mitted’; stop cam,_52, is invariably effective to send
‘64, ‘which is now recelving'l'itsi No.‘ limpuls'ejls , af’m'arkin'ggfor stop in‘ipulse.v a By reference to
also markl'ng‘at this particulartime it will"v have 75 ,Ei‘gullitcan-be seen that the stop bar 89 has no
'
amass:
‘ J'Ynotches formed therein and that the
II is‘
pivoted ‘about the post 85 at its bifurcation ll.
videdfor the purpose
.
I
current flow.
with directcurrent ‘provided a Just described,
Bar ‘I therefore may‘only rotate in ‘a clockwise
' '. vdirection as shown in Fig. 11. Bar ‘88 will be in
a circuit may be traced from t. positive lead Ill, "
\ through contact 282 now in itslleft position, over
- conductor-133; through the lower left-hand con
'variably' Operated to tilt the Y-shaped lever ‘I il
in a ‘clockwise’ direction-to condition the contact
arm i'llf'to send- a marking impulse. due‘to the
1
engagement'of the stop code bar" with the pro-.
: iection ill of the Y-shaped lever HI.
-I_
Selector armature lever "is-provided with an
tact I“ of, switch'lli, inasmuch as switch ill
has been previously positioned in its downward
'10
-' Jupstanding follower arm‘ .18 (Figs)- which is '
‘ -' adapted toeng'age the ?utter cam ll held by the
sleeve 4L“ Just‘ prior to the beginning of ‘each 7
signal impulse 'the ?uttercam 0 acts tomove
. the armature lever 68 towards the selector mag
net “to assist operation of the selector magnet
~ when marking impulsesare ‘received.
-
' Referring now to Fig. "I, the circuit adapted for I
use in connection with the Just- describedm'e
- chanic'al- cipherin'g arrangement will now be ex
. plained. It will be presumed that station I! de-'
sires to‘communicate' with a distant station 22 -
connected respectively to central exchanges .23
and 24 as also shown in Fig. 1.1' The distant sta
tion 22,'of
ofobtainingasteadydirectm
'
will be provided‘with a ine-v
or enciphcring position,v The circuit then extends ' ' "‘ -
over conductor 2", through plugsllllr tostation
‘apparatus 2__|, with a return path over conductor
‘231, through ,contact 23], over conductor 2,".
through contact - “1570f dlrection'switch IOI
(switchnltlnow being- in‘its left-hand position
for transmission ‘from its associated local station
‘to the remote station,;as previously explained), '
over conductor’ 242,- ‘thr'ough the selector magnet ,
I‘, over conductor 2", through contact 2“, over
conductor Ill-‘through contact I“ of current
switch 205, over conductor 2" to negative poten_
tial. . It is therefore found thatunder these con
ditions the selector magnet; 04 isenergired, and.
that. consequently sleeve.‘ II ‘or ‘the transmitter
' unit II is held from-rotation; ‘At this timethere
‘ extends also tothe ciphering unit a second circuit
chanical ciphering unit similarto theone which
afforded b‘yjthe connection of the plug 20!. to the
hasiust been described." In'viewof the fact that . lack 201 which is associated. with {the loop cir
‘all locations do not provide both alternating and
cult which runs to the central exchange 23. This .
direct current there is included with the cipher- ’
circuit can now lie-traced as follows: From one
‘potential conductors provided at?le wi- '
. ing unit means for providing either-‘A. C. or D. C. 80 of
._ current and ‘a manually operated current switch
tral exchange over‘ conductor Ill; through the
ill in order to conditionthe system for operation
- with either’alternatingo'r direct‘cur'rent outlets”
so-that the same unit is suitable'for-use at any I
, ‘ station independent" of the kind or ‘current supply.)
' As viewed in Fig. 7,!Whe'n"the"switch 2" il posi
lower rightrhand contact lllrglof switch “I; over
conductor ill. through contact 2“ or switch III,
over conductors Ill and I", through the start =
‘ magnet DI,‘ over the conductor‘ 251, through re
tioned to the left it isv in its alternating current
transmitting contact ii I, over conductor-.258, over
conductor 26i..through contacts", over con
. 1 position, vhowever, when the switch is positioned .
ductor ' "I, throughicontact - 2“ _of .switch I”,
‘, t0 the right it-is in its direct dlllc'rellt position,
and. over conductor III! to‘ the > other conductor
In order to condition the imit for-operation, the 40 provided with opposite potential-at the central
operator inserts'switch plug‘ Ill‘into the Jack
'
exchange, ll. _At
time start magnet Cl 18‘.
201 ‘and switch plugns' into the 100i) lack-‘ill.
The power plug 2“ is then plugged intoja con- . . Thus,‘ when station it commences to transmit.
each code “combination will be‘ preceded with the
venient outlet already present in‘ standard equip- '
-- energized:
m
i
-
'
45 start impulse to de-energizeselector magnet 84
and releaselthe camsleeve II to operatethe inc--v
.will‘be-presumed that‘ the DBI'?GUI?l“'_P1BO6 at - chanical ciphering unit as already explained, and
alsovto send a stop orjmarking impulse at the
‘which the, printerll is located is provided with ~
alternatingcurrent and'therefore the switch "I F termination of each code combinationto energize
ment.
1 .
For the purpose of the present description it
.
>
will be positioned to the left. With station :l' 60 selector magnet N to stop sleeve II. The con
' about to transmit a message tojthe distantlstation
22 currentnow ?ows over power conductor 2]!
of‘plug 2| I, through contact ill how in. its left
‘ tact arm Ill will therefore be operated to make
’orb'reak the circuit to the central, exchange to
_ transmit, under the’control of key time I", en
'cipl‘ieredsignals. It will be .undersi'.4:iod,'ofv course,
ll‘lfover conductor 2|. through'contact 2'", over 56 that'athe' enciphered signals will ‘be repeated at
" hand position; over conductor»! Hfwindingofcoil
' power-‘conductor II‘ to the ‘opposite side of ‘plug ‘
'th‘ecentral exchange is and eventually sent to
2| l'.~ This induces'in the secondary power wind- ' _-the distant madn- n.
a
.- It will now be assumed that the. distantstation
ing ,2 I} an alternating current for motor 3| as fol.
lows: Over conductor Ill, through contacts vill,
to the motor 3|, also over conductor 221, through’;
contacts v223 ‘to the motor II. The purpose of
the secondary coil 2|! is to provide a compensat-,
"desires to ‘transmit, to the local station II andv
git'will be particularly :pointed out how the direction switch 1" is operated to its opposite posi- .
tion to- receive signals from the remote station.
. ing ‘medium for changing‘ from alternating to .
The transmitting arm H1 is now in its marking
direct current to maintain a stabilized operating
' positionduring a rest period and it ‘will be as- Y.
condition of the motor. ' ' However. the details of 65 s'umed that a condition is encountered in which".
this arrangement need not be described since
there are various methods of'providlng for either
the station 22 commences to transmit. .When the
start impulse is receivedlfrom the distant sta_-‘
tion, start magnet ‘I, which is normally ener-_
,gized 'in the circuit}, previously described, will
coil m which By means of the recti?erindicated 70 become de-energized andwill permit its armature
generally at 225 transforms the ‘alternatingcur- 1. lever “shown in Fig. 4,»to_engage' screw 11 of:
, stop-arm lltoreleaseicam sleeve “I for rota
rent into direct'current. Associated with the rec
tion.~ Since at this'time the selector magnet 64
ti?er is a ?lter indicated generally at m which
is composed of a conventional arrangement in
remains in its energized condition when the .T
cluding a condenser 22'! and a resistance!" PTO 75 lever 19 pushesagainst the control bar as by
- alternating or direct current.
The energization
of coil 2|! also excites an additional secondary .
2,408,682
15
the release‘
th‘e'cam sleeve 3'“. This causes
the start? cam 363v to operate the startbar 364 for
’ tions. In the modi?cation, the direction ‘switch ‘
‘ bar has also beeno'mitted and switching is now
performed by mean's'of a relay system;
_, I
sending 'a' start or no-current impulse by means
v
It is felt unnecessary to describe again porf
of the contact operating arm 3“. Immediately
tions of the instant embodiment of the invention‘ '51 thereafter,” the ?ve code‘ combination impulses "
which are the same as the ?rst embodiment and
a will be transmitted under the control of the code .
therefore such portions. will be described only
» Where necessary for the sake of ‘clarity. Refer
bars 362 associatedwith their respective code bar
‘cams 33L At the termination of the transmis
_ ring now to the drawings, 334 represents a con
sion of the code combination stop cam 366 op
tinually driven shaft comparable with shaft 34 10 .erates to position code bar 366 to'control the con
described in the ?rst embodiment ofv the inven-.
tact operating arm 3|‘I’to its marking or current
tion. ' The-release of a sleeve 3“ is accomplished
position; ~As already/mentioned‘, the first .em-'
bodiment of the inventionmay be consulted for
by a selector magnet 364 and clutch mechanism"
suchv as has already been described, except that
' detailed'operationslwhich are similar in ‘Figs. 16, v
the release'of the sleeve 34 I is accomplished sole‘ 15 16, and 17; and which therefore have not been»
repeated in the present description.
"
'
‘
ly by the selector magnet 364 inview of the fact
that in. this embodiment of the‘ invention,‘ the
Referring now particularly to Fig.“ 17, the cir-.
start magnet has been dispensed with. ‘7 Sleeve
cuit for operating the modi?ed form of scrambling;
3“ is released. by the operation of ‘gate latch ‘
unit will be‘ described in detail.‘ ‘A local station
363 which acts upon the stop arm 342 integrally 20 40| is equipped with‘ a‘ combination keyboard
associated with the cam sleeve 3“. [Cam sleeve
transmitter and printer of any well-known type,
34| carries a series of ?ve transmitting‘ cams 36|
which is designed to communicate by means of
' which ‘are sequentially operable to control a series '
central o?ices or exchanges 402 and 403 with a
of ?ve transmitting code bars 362. Cam sleeve ~
similarly equipped distant’station indicated at
34|.also carries a start cam-353. fbrcontrolling .25 404, which is provided with a ciphering unit 40!;
the-start bar 364, a cam 356 for controlling the
identical in‘ construction with the ciphering unit '
stop bar_366 and a contact operating cam, 361',‘
employed‘in the modi?ed form of the invention.
the purpose of which will hereinafter appear. ~
When-it is desired to attach the ciphering unit
As already mentioned,‘ whereas in the ?rst em
to any standard ‘telegraph printing station, plug
bodiment of theiinventionl the code bars were 30 and jack connectionsmay be made at 406 and
shifted to ‘the left or to the right under thecon
401 which wil1=connect the local station 40| to a
trol' of tape sensing levers,'the code bars are now,
switch 403 and similarly connect the loop from
vsimilarly controlled by a set of code ‘magnets 36|
the exchange 402 to the same switch at the plug
_- which may be operated from a key itape trans- I
connection 1401'. " When switch 403' is positioned '
mitter 362 (Fig. _17). In response to'signalsfrom 35 to its up position, signals may be’transmitted
the key tape transmitter 362, armature levers
directly from station 401 to the central-office 402 '
363 associated with respectivecode magnets 36|
without any enciphering operation taking place.
are moved to the left or right as viewed in Fig. 15
‘However, when itiis ‘desired to‘encipher the sig-.
to enable their associated code bars 362hto assume
nals, the switch 400- may ‘be manually positioned
similar positions. Similarly, selector magnet“ _40 to its downward‘ position and for the purposes of
364 positions the armature lever 366 to the left
the ‘present description, it'will be presumed that
or rightas pictured in the same view to cooperate
the switch has assumed'such a position. ‘ In, ad
with the notch 390 in each code bar to enable the
dition the cipheringunit vvwill be provided with a
code barsto tilt to‘a counterclockwise of- clock
plug 409 which may connect with any convenient
wise position as has already been described in 45 alternating current outlet to provide the current connection with Fig. 1. This tilting» operation
to a motor 4| |. ‘The unit will be further equipped
is provided by the operation of the transmitting
code cams, which sequentially operate associated
. .with a recti?er ‘indicated generally at “2 which
will provide positivecurrent over conductor “3,
. T-shaped operating levers 399. A Y-shaped lever
and negative current over conductor 4| 4, as is.
_ 3|4_ is moved to its marking or spacing position 50 well known in rectifying circuits of this type.
under the combined'in?uence of signals received
‘ by the selector magnet364and by the code mag
nets 36L to operate thepair of contact arms 3|‘|
to their marking or spacing. position, to control
It will be ‘presumed for the ?rst portion 01' the
present/description,‘ that the local station “I
desires to transmit enciphered messages ts thev
lrdmote station 404. 4 Normally, the selector mag
the signal contact mechanismv 3|8. As indicated. 55 {let 364 in the rest condition of the apparatus is
in Fig. 1'7, the contact mechanismq13|0 comprises
two sets of retransmitting or repeater contacts
energized, as is‘common‘ 'ractice in start-stop
ételegraphy, over the to \ wing circuit: From‘
426 and 446, one set being ‘associated with each - ' negative conductor "4|4,‘ ‘over conductor “6,
of the pair of arms 3|1.. The contacts 426 are
through selector magnet 364, over conductor‘ “1,
effective when signals are incoming from a re 60 through tongue “0 ‘of receiving relay 4|! (now
mote station 404 (Fig. 17) ,,through the ciphering;
de-ienergii‘ed) , over conductor 42 l, ‘and over con
unit 400 to the local station 40I, and contacts
446 are effective when-signals areuoutgoing from'
local‘station 40| through the ciphering unit 400
‘I, to the remote station 404." Just before the end 65
~
of each revolution of cam sleeve 34|,- contact-2 .
ductor
to positive conductor 4|3.‘ When the
apparatus at the local station 40l is inits rest
position, winding 423 of the‘ double wound re
peating relay 424 ‘is energized over't'he following
i'circuit: From'vpositive conductors“ 3, over‘con
ductor 426, through contact 426, over, conductor
>cam'36'l will move the bell crank lever 300 in a »
counterclockwiseldirection about its pivot "I (as
.421, through winding "'3 of relay 424,"over'con-., . .. .
vviewed in Fig. 15) to operate the make-before? _
ductor 420, through tongue 423 of switch’403 (now
.break contact 382 for a purpose whicht will
here} 170 in its down position), over conductor 430, through
inafter appear,‘which position is ma‘ aine d dur-tpj
the‘ printer apparatus at statio'n‘140l, over con
ing the restor stop period.
‘
-
,
It will be understood that, as signals are re
ceived by the selector magnet 364,1a start im
, ductor 432, tongue ,433‘ (in'it's down position),
and over conductors 469 and M6, to the negative
pulse will precede each code 'combinationfrt'o cause 375
conductor 4 l4.
'= ’
'
'
‘
when, therefore, local vstation ' 40| transmits
2,408,682
17 " :
;the' start, impulse, the ‘just "described
‘
~
7.
'
:18»
'
mitting "contact so that signals may be
circuit’? is 7
repeated ‘
thereby to the > distant »_ station. ' llormally the ‘
_ broken at ‘ the transmitting contacts 410 at’ the,
- local station 40f, in'awellfknown manner, caus‘-' -
shunt circuit'vfor' contact 446- is asiiollowsz _Over
lead 455,'through closed contact“! of .unoper
ing contact tongue 43! associated with the double
' wound relay 424 to be‘relea'sed. When this occurs,'
ated relay 433;-and over lead or conductor 431. 7
It is assumed thatsignals from station 40]’ are.’ '
.the following circuits are '7 established: vFrom '
being repeated-by the repeating relay<424 which,
by opening and closing its contacts 43 I, causes the‘
signals to be repeated again bythe energi'zatlon
negative lead '4“, over conductor 432, through
_ relay 433, _(which now‘becomes energized), over
, conductor'i434, through'winding436 of the double
and de-‘energizatio'n of .the winding 436 of the
wound relay 4l3, over conductor 436,"'through
, double-wound, relay 4 l3; ;- Therefore, selector
' contact tongue 43l_(now released) of'relay‘424,
magnet 364>will be similarly conditioned so that
and over conductor 422‘to~ the positive-lead 4I3.j _ its armature lever 366‘cooperates with the arma- ,7
4 Thus, at this time both relay 433‘ and 'relay‘4l3
‘ture' levers 363 of the code'magnets IN to con-'
become energized. When relay 413 becomes ener
trol
thej Y-shaped transmitting lever 3J4.v The
15
gized, tongue 4| 3 associated therewith is attracted , centra1o?icei
402 will transmit signals‘ to station
, and consequently the previously describedcircuit
I 404 as its loop circuit extends through‘ the contact
to the selector magnet 364 isjbroken, causing the
446'.‘ Thus the loop'circuit is conditioned tore
‘ceive marking and spacing impulsesfaccording to '
erations, in 'a' manner which‘ is ’ well-known - in.
the operation of the Y-shaped lever 3“. This
,7 start-stop telegraphy. 'When relay 433 operates, 20
circuit is asffollowsr ‘From conductor .4",
it locks ‘up over the following circuit,‘ since as, through
tongue‘ 462 of, switch 403, over the con- ‘
release of the cam sleeve 34! for 9. cycles! op- I
ductor' up, through the'winding‘464 of, double:
cam 361 commences to rotate,.the "make-before: , >
~ 7 break contact 382 is permitted ‘to operateto close ,
it woundrepeating' relay'44l, over conductor 4",, -
-its contactr304 and 'open'its contact 306 to. en'
to the contact 446, over conductor 444,1through
able the establishment oi’ the just mentioned lock-j 25 ‘tongue 461 of switch 408 to the loop conductor
433:
'From
positive
conduc
ing circuit'of relay 7
r4531” hich leads to the central‘ omce identi?edv as
tor 4 i 3, over conductor; 431, through contact ‘334
It.;wi11 be understood that at the
of! ' (nowclosed), over conductor 1430, through‘ tongue
eac H, ‘yclelof operation the make-beiore-br'eak I
433,..of‘rélay433;;through the winding of relay“ contaetjn
will operate to openthe lockingcir»
433
over the conductor 432 to the negative‘ 30 cult extending over conductors 431"andj433 to the lead m. In addition the doubie'woundrepeet-p "
in: relay m is lockedup over the following or;
signals are I being transmitted (sometimes called
echo suppression) v: From negative Ipotentiallead
1618143350 thBtTthe circuit willr'befet'umed Pi’
its normal condition, - '
cult in order'to preventtne repetition otsignals
back into, the originating circuit when‘outgoing‘
l
- , Theroperation of; cam361 at the termination
1 I
each cycle ofoperatiomthrough the operation oi’
as
contact :302, causes the energization of stepping '
magnet 46lnwhich steps the 'key tape atthe key
' ,4 l 4;:throdgh-‘the -right_-hand locking winding,“ oi - ‘ ' transmitter-332 to a new operating position.‘ This 7 ,
v‘ _ repeating relay 44L over conductor 443,.th'roughf
circuitiis asyiiollowsz; From positive conductor _ I
tongue 444 or relay 443, ‘(now closed), over‘c‘on 40 4l3,-over conductor 431, through contactj?, over ' '
ductor 444. over conductor 422, to positive :l'ead
“3.. ‘Since, the winding 464 ofrepeatingj relay
conductor 482 associated with cable 403,over con
ductor 464,-through stepping magnet 40!, over i "
V “I is ‘in the samecircuitwith contacts ‘443', and r
conductor 466,=over conductor 464, over conduc
it relay 441 was not thus locked-up, said relay
would be operated in consonance ,withjthevibrae
tions of contact 443, thus operating iits‘armaga
tors. 461, 468 and 463, thenhover conductor“!
'to'th'e negative lead wire 4l4.,"l'.'herefore,‘ during ,
45
each-V cycle of operationstepping magnet “I will
7 'ture .482 to disturb the control‘ or selector mag- ' , operate to step the tape to anew position.
‘ net 304 by repeating relay'42j4'.v In asimilar man-e
' Vaner, the repeating relay "2'4'W1‘ll be‘"1o'ckedu‘p m
1 The 'codemagnets-36l which are controlled by
7
.
a
_ 'thekey
tape-transmitter
362 are controlled
by the‘,
circuit to be. describedlaten', in‘ order to prevent
nowrtorbedes‘cribed circuit; From ‘positive lead
the repeating relay 424 from sending signalsiba'ck 60 4l3,‘over the‘conductor 4H, and over'cconductor
into vthe “originating circuit Vwhile' incoming" sig-, i
410 to the key tape bus bar 412, which is in‘ this a
from a remote stationgi _'
At'this time, contact 426 is rendered ineffective ‘ ‘ ~
manner normally provided with'positive potential.
nals are‘ being received
Thus, when aitape feeler in the-tape transmitter
for transmission and conversely, contact 4464s‘ _
' ._ .conditioned'fo'r operation in the‘ following man
362 sensesa perforatiom'a circuit will‘ be 'estab-"
55 lished to its respectivecodemagnets as ‘follows:- »_..
her: i The More-‘described energizing circuit for
From; positive bus bar v'412, over the particulars '
th'edouble-wound repeatingrelay 424 is provided‘ - conductor 413_associated withthe particular feel
with a shunt or by-pass to positive battery '4I I 3‘ 7 er pin; over conductor 413a, thencethrough the
at junction 420 on conductor'421“, s01 that-after
associated’ code magnet 36I_ to conductor 441
the ?rst start impulse has become effective, 'the
which acts as 'a negative busbar over the'ilollow
v contacts 426 will be shunted.- This shunt circuit
ing circuit: ‘Over conductor ggpvef'conductor
to negative lead
extends from junction 420 over armature“ 441,
(when attracted as previously described),_ over
conductors 445: and 422 to positive source 4I3.
1 469; and then over conductor
*4l4. .Therefore, according to the marking and
' spacing conditions of thekey tape associated with‘
It is therefore found that when contact arms 3I1 65 the key transmitter 362 .code magnets 413. will be .
move to their marking positions, the closure of a , energized under marking conditions and de-‘ener
contact 426 will be ine?ective, so as not to inter
'gized under spacing conditions. ' ~
Iere with the‘ outgoing signals, inasmuch a‘s?the
I
' The circuit will vnow be described ‘in connec-' .‘
' circuit to contacts 426 has now been shunted out ‘ '- ~
with the receipt of signals from theout
tting contact 70 tion
lying or'remote stations 404 which'are enciphered
443 is rendered effective
by means of the .ciphering unit 406 and then
time since its shunt circuit (hereinafter ‘de
transmitted through central of?ces 403 and 402
of the transmitting circuit.’ Tr ‘
for transmission at this -> -
scribed), whichis normally closed, is now opened, ‘
the circuit
" to the local station '40l. At this time
.
inasmuch as contact tongue 448'of relay 433 is
.to the normallyjenergized repeating relay, 44!,‘
‘ attracted to open the shunt circuit for said transe
e
2,403,682 '
19
'
20
-
,
which is similar to the normally, energized re
peating relay 424, is broken upon. the receipt of
parent at this timethat selector magnet 364 will
be operated according to incoming enciphered
a start or spacing-impulse from the remote-sta- ,
signals received from remote station 404 as re
tion 404. 'I‘hi'sinitiatesa cycle of operation by
lay 44! operates its tongue 482 and causes the
operation of the double-wound repeating relay
4!9, which by its contact tongue “8 repeats the
incoming signals to the selector magnet 364., As
the release of cam sleeve 34!, as has been pre-.
viously described in detail. Thercircuit extend_
ing to the repeating relay 44! is as follows: From
source of potential at central oi?ce 402,:..over con-_ ,
- :lu'ctor 458,- through contact 451 of switchy408,
has already been mentioned, when cam 351
reaches its, stop position the relay circuits are
over conductor 456, through contact 446, over 10 broken and the system is conditioned for recep
conductor 455, through operating Winding 454 of
tion in either direction.
_
'
f
The device according to the present invention,
the double-wound repeating relay 44!, over con
of course, hasymanyapplications. Illustrative of
ductor 453, through tongue 452 of switch 408,
one adaptation of the portable ciphering unit
over conductor 45! to the other source potential
at the central o?ice~402.' At this time, when the 16 described herein, said unit may be readily car
ried about’and attached to any printing tele
start [impulse is‘ transmitted from the remote
‘ station 404,'relay 44! will become de-energized
' graph substation equipment and the party may.
and its tongue 482 will be released to establish
a circuit for relay‘4l9‘and relay 484-as follows:
From positive lead 4!3, over conductor 422
through tongue 482‘ of repeating relay 44!, over
conductor 485, through the winding 483 of re
lay 4l9, over conductor 486, through the’wind
ing of relay 484, over conductor 432 to the neg
-be able to communicate secretly with any other
substation having a similar unit attached. After‘
they unit is plugged in and the switch operated
to the plain message‘ position, communication
may be established to the. desired station by
ative lead “4. When relay 484 becomes ener
gized,*it is locked up as cam 351 operates to close
the contact 384 as follows: From positive lead
transmitting plain English to the central o?ice
or exchange as is now done in normal practice.
25 When the desired station is connected and a sim
ilar' unit has been attached at the'cailed station,
theitwo cipher key mechanisms or units are set
in exact correspondence either according to a
“3, over conductor 431, through contact 384,
special code sent at the time '01‘ according to'prior
over conductor 438, through tongue 49!, through
the winding of relay 484, over conductor 432 to 30 informationreceived ‘by. independent means. or
by a prearranged schedule. When the settings ,
negative lead “4. Operation of relay 484 also
have been veri?ed, the switch at each station is
causes the locking up of the repeating relay 424
operated to the ciphering position and enciphered '
to prevent this relay operating'at this time in‘
. order that its contact tongue‘ 43! may not inter
transmimion may‘ proceed.
It ‘will be understood that various changes and
fere with signals in the circuit. This circuit is 35
modi?cations maybe made in the present inven
as follows: From positive lead “3, ‘over conduc
, tion without departing from the spirit and scope
tor 422, over'conductor 445, to contact tongue
thereof," and the invention should accordingly
432 of relay 484, over conductor 493, through the
be limited only by the appended claims. ,
locking winding 494 of relay 424, over the con
What is'claimed is i
,
ductor 495, and over the conductor 432 to the 40
1. In a regenerative repeater, a start magnet,
negative conductor 4 ! 4.
a. ‘selector magnet, means to start the repeater
After the ?rst start impulse has become effec
at the beginning of a signal in response to' the
tive, transmitting contact 446 is ‘ltrriclgedv over the
following shunt circuit already described above: 45 operation of the start magnet, a contact mecha
nism, means to control the contact mechanism,
Over conductor 455, through contact 448 of re
by the selecting magnet only, two signal circuits
connected to‘ the repeater, and- means responsive
to a signal initiated in either circuit to start the
repeater units operating, and means responsive
50
to the initiating impulse to connect the selector
Contact 426, however, is now
magnet in ‘the circuit initiating the impulse and
lay‘ 433 (inasmuch as relay 433 is now de-ener
gized) , then 'over conductor 431. It is thus ap
parent at this time that the operation of con
tact 446 thereafter will produce no harmful re
sult in the circuit in view of the shunt circuit pro
vided therefor.
free to operate, due to the fact that contact 441
the start magnet in the other circuit.
of’relay 433 is nowfopen and the previously de
2. In a telegraph system, a signa1 selecting de
scribed circuit does not shunt out the contact 426.
vice,
a cam sleeve started into rotation at the
Therefore, a circuit is made to repeat deci 55 beginning of each signal and stopped at the end
phered signals to the local printer 40! as fol
of each signal, a plurality of circuits any one of
lows: From posi?ve lead 4l3, over conductor 425,
whichmay receive controlling signals, a similar
through contact 426 (now operating), over con
plurality of magnets, all of said magnets adapted
ductor‘421, through winding 423 of relay 424 to start the cam sleeve in motion, only one of
60
(now locked) , over conductor 428, through tongue
said magnets being adapted to selectively control
429 oi‘switch 408, over conductor 430, through
the'device, and means to invariably connect the
the printer at station 40!, and on a return path
selecting magnet in the circuit which receives the
over conductor 432, through tongue 433, over
initiating signal.
conductor 469 and over conductor M5 to the neg
‘LOUIS M. PO'I'I‘S.
65
ative source of potential 4!4. It is further ap
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