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Dec. 10, > 1946.
' 2,412,300
Filed July 22, 1942
,- . ‘4444::
,4. 24-week
BY 7%
Patented Dec. 10, 1946
‘James A. Spencer, Teaneck, ‘N. J., assignor to
' Radio Corporation of
America, a'corporation of
ApplicationJuly 22, 1942, Serial No. 451,878
8 Claims. (01. 164-114)
This invention relates to improvements in tele~ '?
operation into a reperforating operation applied
to a. plurality of blank tapes.
Among the advantageous features of my inven
tion is the facility with which a cryptographic or
graph tape reperforators and ‘has particularly to
do with a device of this character which is capable
of automatic operation for duplicating in a plu
rality of tapes the code signals which were pre~
viously perforated in a master tape. My inven- P ~l
tion has particular utility :in the preparation of
duplicate tapes, one of which is intended to be
utilized at the place where it is prepared, and
the other of which is intended to be transported
physically in a sealed package to the intended
receiving station in time to be used for decipher
ing cryptographic messages. The invention :is
not, however, limited to such use.
In cryptographic telegraphy it is necessary to.
other tape of any desired length may be prepared
in duplicate by using sequentially a number of
shorter lengths of master tape. It is an object
of my invention to provide this facility, so that
‘duplicate tapes of any desired length may be made
available for cryptographic signalling without
danger of interruption of cryptographic message
transmission by breakage of spliced pieces of tape.
‘Other objects of my invention, as well as ad
utilize identical tapes for ciphering at the trans- '
vantages thereof, Will be brought out in the de
scription to follow. This description is accom
panied ‘by a drawing, the sole ?gure of which
mitting station and for deciphering at the receiv
ing station. Heretofore such ‘tapes have been
shows in an‘ elevation ‘view the essential parts of
a multiple tape reperforator constituting a pre
prepared individually by keyboard perforators.
ferred embodiment of my invention. >
Cryptographic tapes are used in conjunction 20 ‘ While there are numerous types of telegraph
tapeperforators which have been in commercial
with message tapes for interchanging the mark
use fora long time, 'I have found that one known
ing and spacing elements of code signals so that
they shall be rendered unintelligible if thessignals ‘ as Ethel-llvheatstone perforator may readily be
modi?ed and supplemented by new mechanism in
themselves are intercepted by an unauthorized
person. In an application Serial No. 444,658, 25 such manner as to carry out the objects of my
invention. The invention though not limited to
which was ?led vMay 27, 1942, jointly by Loyd A.
‘the use of a modi?ed Wheatstone perforator is
Briggs and ‘myself, a system is ‘disclosed wherein
best illustrated in combination with such a device.
an enciphering tape is used simultaneously with
‘To those ‘skilled ‘in the art, it is well known that
a message tape at a transmitting station for char
acterizing the marking and spacing elements of 30 a Wheatstone perforator may be manually op
erated'for spacing the tape as the code perfora
code signals. That system also discloses how a
tions are applied. 'A row of ‘feed holes is also per
replica of the enciphering tape may be used at
forated‘ simultaneously with the rows of holes
the receiving station as a deciphering tape. When
‘representing ‘the code‘ signals. If the tape is in
deciphering is to be accomplished, the received
signals are utilized jointly with impulses ‘locally 35 tended for use in a Morse code signal trans
mitteror in a cable code transmitter, then only
derived from a deciphering tape sensing device
two rows-of code perforations are applied longi
tudinally of the tape. When, however, the tape
so that all sense reversals which were produced
at the transmitter by the cryptographic tape are
compensated and the original code signals of the
message tape are restored. It will, therefore, be
apparent that such restoration could not be ob
tained at the receiving station unless the per
forated tapes used at each end of the circuit are
Accordingly, it is an object of my invention to
provide a telegraph tape reperforator vwhich is >
suited to the requirements for automatically read
ing the perforations in a given master tape and
newly perforating a plurality of tapes which :shall '
be exact duplicates of the master tape.
It is another object of my invention to provid
a multiple :reperforator which includes the: neces
is to ‘be used for ?ve-unit or seven-unit printer
code signals, the perforations are generally ar
ranged transversely of the tape and on both sides
of the sprocket feed holes. In ‘the embodiment
herein illustrated, the principles of my invention
are ' suf?ciently exempli?ed by its application
to a 'Morse signal perforator. Such changes as
would be necessary for adapting the invention to
a printer code perforator involves merely the ad
' dition of more punches and punch hammers, as
‘will be apparent‘to those skilled in the art.
‘In, order to sense the perforations in a master
tape, I preferably. feed such a tape l8 step-by
step through a gate G by means‘ of a sprocket
wheelill. ‘The sprocket teeth of this Wheel mesh
sary mechanism for sensing the perforations sin
‘with-“the <c'enter1holes in the ‘tape. ‘The tapev'is
a master tape and ‘for translating .‘the. sensing 55 held 5in' place for'the sensing operation vby means
of a latch I. In accordance with conventional
plunger bar 39 requires no spring’ l9, since its
tape transmitter design, the latch I can be lifted '
right hand end is always held at a suitable level _
to be struck by the projection 35 on ball 1.
away from the gate G for insertion of the tape
at the outset.
When one (or both) of the seekers 2 is op
posed by an unpunched ‘portion of the master
tape 18, then the lever L fails to rise appreciably.
The seekers 2 are constituted as prongs on a
plurality of levers L, which levers are pivoted at
El. The seeker'prongs 2 are urged upwardly by
means of springs l5. A shaft 22 is constantly
Theprojection '34 doesjnot rise, to'the'level of
the? hammer head 35 "onthe end ‘of bail 1.‘ In .
driven by a motor (not shown) and carries a
such case, therefore, no operation of the corre
cam 8 for engagement with follower rollers 23 10. sponding punch 3| will take place.
and 23, in order to actuate the lever arms 25 and
‘As the cam 8 continues to rotate, ball 7 returns
26 respectively.
'to its normal position under the in?uence of a
Lever arm 25 is pivotedrat I 3, and carries a
- spring l4. ' The punches 3| and 33, are then per
?exible bail 6 for engagement with eachv ofv the.
mitted to be withdrawn from the tape or tapes
detents 27, the latter being integral with respec 15 passing through the die block 32. This with?
tive ones of levers L. By means of a screw H ' ‘drawal is effected by means of springs 36 oper
threaded into the lever 25 and held in place by
a, lock nut 28, the extent of movement 10f the‘
lever L is adjustably controlled.
ating upon a movable plate 31 and against
shoulders 38 on the punches 3| and 33.
In order to hold theflevers 3 out of the path ,
At the upper end of the lever 25 is pivoted a 20 of the hammer head 35 on the bail 1- while in
pawl member .5 arranged to cooperate with a
ratchet wheel R on the shaftof the feed sprocket.
sertingtapes under the latch I, it ‘is preferable’
to utilize a cam 20 which can be rotated through
an arc of 90°.by manual operation. This oper
The pawl is held in engagement with the ratchet
wheel by means of a spring l6.
ation looks down the levers 3 until such time
It is apparent that whenithe crown of the 25 as itis desired to start the punching operation.
cam 8 moves the bail 6 to the right, the'seeker
' In view of the ‘foregoing description, theioper- ‘
pins 2 are withdrawn from perforations in the
ation of my invention, simple as it is, will be
tape and immediately thereafter the tape isfed
well understood‘by those skilled in the art. 7.
from right to left by the counter-clockwise rota
It will be also understood that ‘my invention
,tion' of the sprocket wheel 4, this rotation being 30 is capable of being carried out by means of other
provided by a retractive movement of the pawl v5.
» constructions than those herein shown and'de
. .When the bail 6 returns to its normal position,
scribed. ' The claims, therefore, are to be con‘
the seekers 2 are caused to rise under the in
strued as thoughinot limited'to the exact de
fluence of the springs 15. _If one or anotherv
tails of mechanism herein shown by 'way' of
seeker passes through‘ a‘ perforation in the tape 35 illustration; ;
l8, then a lever 3 is liftedsui?cientlyto; place
' its projection 34- in line with-a hammerhead
35 on a punch bail 1. This punch bail is mounted
lever arm 26 is pivoted‘ at 12. The upper end of
.the bail l is adjustablyspaced away from the
:lever 26 by meansof ascrew l1 threaded into
lever 26 and secured thereto by means of a lock
tionsin a master tape to be fed past a sensing po
sition_ mechanism actuated by a. single rotary
cam for causing said seeker members to perform
a sensing operation, a tapeperforator having
punches corresponding to said seeker members,
punch'selectors individual to said punches, ‘at
The levers 3 are arranged to coact with
punches 3|, the latter being held in place'in a
'leasttwo of said selectors being selectable by said
mechanismin' accordance ‘with said code perfo
punch block l0 and suitably aligned with a gate,
or die'member 32 through an opening in which
rations, and a bail reciprocally operableby-said
cam upon each revolution thereof to communi
The mechanism necessary to‘feed the blank 50 cate power through selected ones of said ‘selectors
to their respective punches, thereby to reperfo
tapes through gate ‘32 has not been shown be
rate new tape in accordancewith said master
cause it is of well-known construction, and forms
no part of the instant'invention. It will be
_ 2. Tape perforating apparatus comprising in
understood, however, that such feeding mecha
combination, a controlling device having seeker
nism may comprise a sprocket wheel similar to
one or more blank tapes may be fed.
in step with the sprocket wheel '4 simply by
providing a reciprocating pawl to be driven by
‘In addition to the punches 3| which are re
a pawl pivoted on a lever arm andreciprocally
the same motor as that which drives the cam
pins aligned with rows of code perforations to
be sensed in a master tape after each step’ of
tape feed, a, single rotary cam, means including
the sprocket wheel 4, and that it may be actuated V
shaft 22,1
actuated by'said cam in cooperation with a spring,
whereby said'master tape is‘ fed step-by-step past
a sensing position, lever means actuated by said
quired for punching the code perforations in, the
‘cam for periodically withdrawing said seeker pins
new tapes in accordance with‘ perforations sensed
from the plane of said master tape, a tape per
‘by the seekers 2 in the master" tape l8, I'provide
a center-hole punch 33 which is actuableby a 65 for'ator assembly having code punches corre
'sponding to said seeker pins and a, feed-hole
plunger bar 39, the latter being slideable in ways
punch, punch‘selectors'individual to each of said
formed in a guide block 40. The manipulation
punches, a bail actuable by said cam, means actu
of the cam 20 may be facilitated by the use of
'a handle 9 by which the cam’ may be rotated
through an'angle of substantially 90‘? on itspivot
ated by said seeker pins for providing selective
control of the selectors ass'ociat'ed'with said code
punches, and means includingv a'bail recipro
qcally' actuated‘ by said cam in cooperationfwith
must be actuated at every'stroke of the bail ;-"~_said spring for‘ applying power» to‘ selected ‘ones
:1; Hence, the lifting lugs Safare‘ provided only
.of said selectors thereby to perforate replicatapes
for the ‘two lever bars 3. Furthermore, the 75 in accordance with said master tape.
centers There is no need to lift and lower the
righthand end of the-plunger bar 39 since it
‘plurality of tape-perforation seeker members ar
ranged'in alignment with rows of code perfora
on the lever arm 26 by means of a screw 29. . The -
nut 36..
p l; A telegraph tape reperforator comprising a
3. In a telegraph tape reperforator, a plurality
of reciprocable seeker pins adapted to sense the
presence or absence of code perforations at dif
ferent positions in a master tape, a punch and
die mechanism havinga blank tape holder, one
continuously rotatable cam operable in associa
tion with a reciprocable punch bail for causing
said mechanism to work upon strips of tape in
punch-and-die assembly having a feed-hole
punch and a plurality of code character punches,
a reciprocable lever system having two levers dis
posed in diametric opposition to a continuously
rotatable cam, said levers being alternately mov
able by said cam during an operating cycle, a
master tape having code character perforations
which are to be copied in perforating new tape,
means operable by one of said levers-for sensing
said holder, a single cam follower means actuable
by said cam for feeding said master tape stepwise 10 the code perforations in said master tape, and a
selectively operable device under joint control of
and for reciprocating said seeker pins, and an
said sensing means and of the other one of said
other single cam follower means actuable by said
levers for causing said new tape to be perforated
cam and operable through said punch bail for
by said punch-and-die assembly in accordance
actuating selected punches of said mechanism,
the selection whereof is effected by the sensing 15 with said master tape.
6. A perforator in accordance with claim 5, and
operation of said seeker pins.
including a non-selectable punch striker for com
4. A telegraph tape perforator comprising a
municating the motion of the “other” of said
punch and die assembly having a feed-hole punch
levers to said feed-hole punch.
and a plurality of code character punches, a
'7. A perforator in accordance with claim 5, and
punch selector individual to each of said punches,
including a plurality of punch strikers selectable
a, continuously rotatable cam, two reciprocating
by said sensing means for communicating the
levers, each having an idler roller journaled
motion of the “other” of said levers to said code
thereon, said levers being pivotally mounted for
character punches.
sequential actuation by a single hump on the
8. A telegraph tape reperforator comprising a
periphery of said cam, resilient means for main
master tape feeding device operable step-by-step
taining contact between said idler rollers and the
periphery of said cam, a master tape the code
character perforations in which are to be copied
in perforating new tape, a master tape sensing
device comprising reciprocable seeker pins and a
to bring successive transverse rows of code per
tape feeding mechanism, said sensing device be
ing actuable by one of said reciprocating levers,
a plurality of punches arranged to perforate a
replica tape, a punch bail reciprocable at the ca
dence of the step-by-step operation of said feed
forations into a sensing position, sensing means
operable at each step of said feeding device to
detect the code combination punched in said tape,
means for causing each seeker pin, when it ?nds
ing device, means under control of said sensing _
a code perforation in the master tape, to select
a corresponding one of said punch selectors, and r. means for causing said bail to apply power to
selected punches, and. a driving mechanism for
a punch hammer operable by the other of said
_ actuating the tape feeding device, the sensing‘
reciprocating levers, in cooperation with a non
means, and the bail, said mechanism including
selectable one of said punch selectors to perforate
a rotary cam against the periphery of which two
said new tape with a continuous row of feed holes,
also to perforate code holes by cooperation with : diametrically opposed cam followers are pressed.
selected ones of said punch selectors.
5. A telegraph tape perforator comprising a
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