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Патент USA US2404007

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1
July 15,1945»
‘
A. E. THOMPSON mm.
g?mgow
TELEGRAPH APPARATUS
Filed Aug. 20, 1943
s Sheets-‘Sheet 1
jw?y 16, mm,
A. E- THOMPSON El'AL '
v 2,4949%?’ I
TELEGRAPH APPARATUS
Filed Aug. 20,1943-
‘ s Sheets-Sheét. 2
July 16, 1946».
A. E. THOMPSON ETAL
2,404,007
I TELEGRAPH APPARATUS
Filed Aug. 20, 1945
‘
3 Sheets—Sheet 5
Patented July 16,‘ 1946
2,404,007
‘UNITED STATES PATENT-OFFICE
2,404,007
TELEGRAPH APPARATUS
Alfred Edward Thompson and Reginald Dennis
. Salmon, Croydon, England, assignors to Creed
and Company LimitedCroydon, England
Application August 20, 1943, Serial No. 499,310
‘ In'Great Britain August 21, 1942
19 Claims.
2
This invention relates to keyboard transmitters
for Morse signals.
Manual Morse working has many important
advantages, particularly in wireless communica
tion, but unfortunately it involves operators with
a high degree of telegraphic skill. Moreover, in
manual working it is notpossible to obtain strict
operating uniformity, either as regards .signal
formation or speed oftransmission. An operator
cannot transmit with machine precision and it is 10
for ‘the elements of a signal into position repre
senting the last element of a signal which is
also difficult for him to maintain a.v .pre-deter
mined speed, particularly if this is below the max
imum speed at whichhe is capable of working.
It is the object of the present invention. to
tive of said key.
invariably a space.
Yet-another feature of the invention is a key
board operated Morse transmitter comprising
three-separate means for transmitting the three
different elements of a Morse signal and means
operable on the actuation of a key for actuating
said separate means in the ‘correct combinational
sequence to transmit the Morse signal'representa
7
In the preferred embodiment of the invention
three cams are independently driven to transmit
different elements of a Morse signal and are
provide a simple and ruggedinstrument, adapted 15 ‘released ‘for rotation in‘the ‘correct combina
tional sequence on actuation of a key.
for operation at the normal speeds of present
A further feature of the invention is a key
manual working whichonly requires .the operator
board operated Morse transmitter comprising
to possess moderate typing skill.
means for locking the keyboard'duringthe trans
Morse keyboard transmitters have previously
been proposed but it is believed that not one of 20 mission of ‘a- signal representative of a key that
has been actuated and means operative in the
them was a really practicable instrument orwas
case of a signal less than the maximum length
adapted for full keyboardlocking as is usual on
for unlocking the keyboard on the conclusion of
a-short interval following the transmission of a
rl‘he keyboard transmitter according. to the 25 signal and before the lapse of the time necessary
to transmit a signal .of maximum length.
present invention may work with a receiver which
keyboard transmitters for. equal letter code sig
nals.
prints the representations of the dots and dashes
' The‘Morse land iline code uses two line condi—
on a tape. Knowledge of the Morse alphabet is
tions only, viz. marking and spacing. A dot
is constituted by a mark of onetime unit followed
desirable, of course, for translating. the signals
as printed on the tape, butthe degree of knowl
30 by a space of one time unit, a dash is ‘constituted
edge necessary is not great. .Anyonecan read the
tape by referring to a list of Morse characters
andaiter only a few hours practice evenithis
aid is found to be not required.
One feature of the present. invention consists ‘
in a keyboard operated Morse transmitter com
prising means operable on actuation of a key to
analyse the Morse signals representative of. said
key into elements and to cause the transmission of
said elements in correct combinational sequence ‘
and means operable upon the ?nal element hav
ing been transmitted to return the mechanism
rapidly to a position ready to transmit another
signal.
‘
-
by a mark of three time units followed by a space
of one time unit, whilst a letter space is con
stituted by a space of two time units.
In the Morse cable code, three different line
conditions are used; dots and dashes are repre
sented by positive and negative current respec
tively each of unit duration and a letter space by
a no current period of unit duration. It is to be
noted that a character is not completed without
the terminating letter space. The terminating
letter ‘space is, therefore, regarded as one of the
elements constituting a character. illoreover, in
either code a space of two units duration follow
ing a signal‘completes ‘a word space, and- thus a
space ‘of two units-duration can beregarded as a
Another feature of the invention consists in
separate character.
a keyboard operated Morse transmitter compris
ing combination bars, means actuated by the op
It‘ will be understood that, because the char
acters of the/Morse code vary in time required
eration of a key to set the combination bars into
positions characteristic of the respective elements
for transmission, the rate at which the-keys of
of the Morse signal representative of said key 5.0 the keyboard can be depressed will vary in like
and to cause the said elements to be transmitted
‘manner. It follows, therefore, that if the ma
chine is adjusted‘ so that the signalling rate is
in correct sequence. Preferably the combination
bars are provided in number equal to :the maxi
‘equal to,~for- example, 20 words per minute, the
mum number of elements, less one, in any signal
rateatwhich the keys may be depressed will
and means is provided to set each bar not required 55 vary from about 10 words per minute to about
2,404,007
d
3.
80 words per minute, according to whether they
correspond to long or short signals. The highest
sliding bar, it releases a sleeve 59 for rotation and
a cam 54 thereon acts to operate contacts 61 to
rate at which the keys must be operated corre
sponds to the space key and the next highest
send a dot. If frame member 46 is moved, it re
leases a sleeve 6! for rotation and a cam 63 there
Cl on operates contacts 67 to send a dash. In either
case shaft 22 is then allowed to rotate, after the
rate corresponds to the letter E. If the time
available for the depression of these two keys
is increased, the maximum rate at which the
keys must be depressed will be reduced to about
required signal element has been transmitted,
for a further step, and the next signal-element
is transmitted. When frame member 41 is raised,
30 words per minute. A variation in rate of the
operation of the keys from 10 to 30 Words per 10 indicating that a space element is to be sent, a
minute for the signal speed of 20 words per min
sleeve 76 is released for rotation and after the
ute does not impose any strain upon the opera
space element has been sent releases the shaft
tor.
22 for rotation into initial position, in which it
For this purpose the keys corresponding to
is arrested. During rotation of shaft 22, a frame
characters represented by the shortest Morse sig 15 member 3i locks the keyboard, but is withdrawn
nals, namely those for the letter E and the word
from looking position when shaft 22 reaches its
space are preferably arranged so that the ?ngers
home position.
of the operator can actuate them whilst a sig
The apparatus is driven by a motor 25 which
nal corresponding to a previously actuated key is
can also drive a tape feeding mechanism for a
being transmitted and a separate mechanism is 20 recorder, which prints dots and dashes corre
preferably provided for actuation by these keys.
sponding to received signals on a tape. A send
This separate mechanism is preferably so ar
receive switch is provided with a member 92 which
ranged that either of these two keys can be actu
in one position of said switch causes motor 25 to
ated whilst the main mechanism is transmitting,
drive the recorder.
the mechanism being arranged to store the sig 25
Preferably the keys for the letter E and the
nal so that either of these two signals is not
letter space signal do not act on the combina
transmitted until the main mechanism has ?n
tion bars but are, as shown in Figs. ,3 and 4,
ished transmitting. If one of the two keys men
associated with storage mechanism whereby these
tioned is actuated, however, the whole keyboard
keys may be actuated during the time that the
is locked until the corresponding signal has been 30 preceding signal is being transmitted.
transmitted.
The construction and operation of the appa
The transmitter according to the invention
ratus will now be described in detail. Referring
may be combined with a Morse signal recorder
now to Figs. 1 and 2, all the combination bars
driven by the same motor as the transmitter. A
are similar to the one shown. ‘This consists of
send-receive switch is then provided and is com 35 two members If and 2f pivoted at their ends to
bined with a lever which starts or stops the
three armed levers 3]“ and 4]‘. The third arms of
tape.
,
the three armed levers 3]’ and 4]‘ are connected
The nature of the invention will be better un
together by a link 5)‘. If the member If is pushed
derstood from the following description of a pre
downwards the member 2]‘ must rise, the levers
ferred embodiment thereof taken in conjunction
31‘ and. 4f acting as a see-saw or balance, and
with the accompanying drawings in which:
,
link 5]‘ is moved to the right. If member 2]‘ is
Figs. 1 and 2 are an exploded perspective view
pushed downwards the member If must rise and
of one embodiment of the invention; and
link 5]‘ is moved to the left.
Figs. 3 and 4 are an exploded perspective view
A set of key bars such as 53 is arranged in well
of a supplementary transmitter for the shortest . = known manner over the combination bars, and
signals adapted ‘to form part of the transmitter
of Figs. 1 and 2 showing how the supplemen
tary transmitter is positioned and inter-related
with that shown in Figs. 1 and 2, and how the
transmitter of Figs. 1 and 2 is modi?ed for this
inter-relation.
Referring to the drawings, an outline descrip
tion of the construction and operation of the
Morse keyboard transmitter shown in Figs. 1 and
2 will ?rst be given, and then a more detailed
description. The machine shown has six combi
nation bars, one only of which is shown. The
depression of a key bar 6 sets all six combina
tion bars, the result being to move a portion of
the members If and, 2f and the corresponding
members of all the other combination bars are
cut with notches of various depths in relation to
the key bars, so that the links such as 5]‘ are
moved in accordance with the elements of the
Morse signal representative of the particular key
actuated.
I In the form shown the key bars 6 are pivoted
at their ends remote from the keys and are de
pressed against the pressure of individual springs
(not shown) and the upper surfaces of members
such as If and 2)‘ are notched. If a link 51‘ is
to be moved to the right by a key bar, the mem
ber 2]‘ presents a full depth notch to the key
If a
leave it in the position shown, and also to move
link 5)‘ is to be moved to the left by a key bar,
a trip bar it? to the left. To the portion 51‘
the member If presents a full depth notch to
of a combination bar is ?xed an extension 38.
the key bar and the member 21‘ an uncut portion.
These extensions co-operate with sliding bars 39a,
If a link 5]‘ is to remain in middle position, both
39b, 39c, SM, 39c, 39)‘, of which only the last
members If and 2]‘ present a half depth notch
mentioned is fully shown, the others being shown
to the key bar.
broken away. Each sliding bar is accordingly
The largest number of elements comprised in
positioned under one or other of three frame
any Morse signal for which the apparatus shown
members 155, 66, 41. The movement of the trip
in Figs. 1 and 2 is adapted is seven, and conse
bar it allows of a shaft 22 being rotated in 70 quently six combination bars like that shown are
step-by-step manner. Cams 42a . . . 42]‘ act in
provided, the last element in the case of signals
turn during the respective steps of movement
having the maximum number of elements being
on sliding bars 39a . . . 39]‘ and raise these bars
transmitted automatically. Combination bars not
into engagement with one of the frame members
required for the elements of a particular signal
135, 46, 47,. If frame member 45 is moved by a
are set to the space position. For example, for
each such as 5]‘ either to left or right or to 60 bar and the member if an uncut portion.
2,404,007
5
6
ber 39. The interposing member 39]‘ correspond
ing to the link 5]‘ of the sixth combination bar
is shown, the interposing members 39a, 39b, 39c,
39d and Ste of the other combination bars are
all similar to member 39]‘ but are shown broken
away for the sake of clearness. The interposing
be ‘moved to the right and the links of the fourth,
?fth and sixth combination bars to be moved to
middle position.
members are slidably mounted on cam levers 46a
10
nected together by a ‘link l0. Thus actuation
of any key bar moves link If! to the left. Link
if! carries a pin I l engaging with the upper arm
of a two armed lever 12, the lower arm of which
carries a pawl Is. Thus movement of link it ~
to the left, rotates lever l2 anti-clockwise against
tension of a spring 11 and moves pawl l3 to the
right. Pawl l3 co~operates with the upper end of
a lever M fixed on a shaft l5, and thus when
moved to the right rotates shaft l5 clockwise.
A ‘lever i6 ?xed on shaft I5 is thus moved clock
wise against spring 31 and an extension H on
lever it is moved from engagement with the ex
tension it? of a lever 19, another extension 2f.) of
which engages with an escapement wheel .24 ?xed
to ‘shaft 22. Lever i9 is ?xed to a sleeve 26,
freely mounted on shaft 2?. Sleeve 25 carries a
rounded
end which engages a slot in an interposing mem
letter causes the link ‘5 of the ?rst combination
bar to be moved tor-the left, the link 5‘ of the
second combination bar also to be moved to the
left, the link 5 of the third combination bar to
Each key bar 5 also engages a trip bar ‘I mount
ed upon a pair of‘ bellcrank levers 8 and 9, con
.
‘The extension 38 is provided with
the letter U the actuation of the key forthis
48b, 490, see, Ellie and 59]‘ only the last mentioned
of which‘ is shown in full.
A projection 4| on
each cam lever engages with a corresponding cam
42 on shaft 22.
In order to make the operation of the appa
ratus clear the transmission of the letter U will
be ?rst described. As Stated above, for this let
ter the first two links 5a and 5b (not shown) are
moved to the left, the next link So (not shown)
is moved to the right and the remaining links 541,
5c (not shown) and 5]‘ are moved to middle posi
tion.
.
When shaft 22 moves through the ?rst step a
cam 62a thereon engages the projection All on the
?rst cam lever 40a and momentarily lifts this
cam lever and the corresponding interposing
member 32a. A projection 454a (not shown but
similar to NJ) thereon is below the bail member
5.15, since‘ the interposing member 39a has been
moved to the left; Bailmember 125 is pivoted on
22, When extension I‘! is disengaged from exten
sion E3 on lever l9, this lever and with it sleeve 30 shaft 2'? and rotates counter clockwise against
the action of a spring (not shown). An extene
2%‘ and'lever 28 are moved clockwise by a spring
sion 48 on bail member 45 is thus removed from
34, bringing lever 23 into engagement with cam
engagement with‘ an escapement member 49 ?xed
29 and releasing shaft‘ 22 for rotation. Shaft 22
cam lever 28 co~operating with a cam 29 on shaft
is driven from motor 25 through gear 24 and a
friction clutch 23.
'
As shaft '22 rotates, cam 29 engages cam lever
28 and moves sleeve 25 and with it lever 19 in an
anti-clockwise direction and brings projection 20
on lever 59 into engagement with the next tooth
on escapement wheel 2 i.
‘
The shaft 22 carries cams Sila and 33b and a
frame 2! pivoted on shaft 21 carries rollers en
gaging these cams under tension springs 35 and
35. When shaft 22 has rotated from initial po
sition, cams 29a and 39b allow springs 35 and
35 to rotate frame 3! clockwise.‘ Frame 3| thus
engages the lower surface of pawl l3 and dis
engages it from the upper end of lever Hi, there~
to a sleeve as on the shaft 5i. ' Shaft bl is con
tinuously driven by the motor 25 through a gear
52 and sleeve 56 is freely rotatable on shaft‘iil
and. driven from that shaft through a friction
clutch (not-shown); Sleeve 55 carries cams 53
and‘) 5ft.
There are two teeth on the escapement
40 member 659 ‘and so sleeve-5Q is allowed to rotate
forhalf a revolution, before being arrested. Cam
5d co-operates with a cam lever 55 ?xed to a
sleeve ii?ifreely rotatable on shaft [5 and carry
ing a second cam lever 51 acted on by a spring
555 which accordingly holds cam lever 55‘ against
cam 54 and cam lever 5? against a cam 63.
Cam
lever.‘ 55. carries a pin 62 acting on a pair of con
. tacts iii’. ‘When‘ sleeve iii rotates therefore earn
551 causes pin 66 to actuate contacts ii”! to gener
by leaving lever it free to be again moved by
atea dot. vAs cam sleeve 5t approaches its stop
spring 21 to bring extension I‘! of lever l 6 against 50 ping position cam 53 acts on cam lever 55 ?xed to
extension 18 of lever l9 and holding projection
shaft l5 and so rotates the shaft Iii clockwise and
20 on lever E9 in engagement with the second
with it lever 16. Extension It is withdrawn from
tooth on escapement wheel 2! so arresting shaft
212.
To each link
of a combination bar is ?xed an
extension 38 having a portion 33 cut with cor
rector teeth 32. The upper edge of frame 3| is
formed with a knife edge and when the frame
moves clockwise the knife edge engages between
engagement with lever it’ and so projection 2t is
withdrawn from escapement wheel 2 i. Shaft 22
again rotates.
In moving through a second step, the cam 29
brings projection 21'} back into the path of the
teeth on escapement member 2!. The rotation
the Corrector teeth 33 of all the combination bars, 60 of shaft 22 through this further step causes cam
42b to lift cam lever 49b and interposing mem
which are thus held in the positions into which
ber 39?) momentarily, and as this latter has been
they have been moved, the combination bars be
ing thus 1ocked.
If the key that has been depressed is released it
rises, thereby permitting trip bar 7 to rise and
the associated link if] to be moved to the right
under the influence of spring 17 urging lever
set for a dot element bail member 45 is once more
rotated anti-clockwise, sleeve 55} is once more re-
leased for rotation and a further dot is trans»
mitte'd.
The cam E3 is so formed that the release of
shaft 22 occurs at such a time that the actuation
i2 clockwise. Pawl l3 consequently moves to the
of the bail member 45 will occur at the moment
left. If the distributor shaft 22 has not at this
time completed its rotation, a step 16 on pawl 13 70 when the escapement member 49 would be strik~
ing the extension 48 of the bail member if it had
when moved beyond frame 3!, now in its actu
not just- been moved.‘ Thus the escapement
ated position, engages the vertical face of that
member 49 is permitted (in this case) to move
frame. Consequently neither the same key, nor
‘forward in acontinuous manner without being
any other key can be depressed during the time
'
that frame 31 is held in its upper position.
75 arrested. '
.
2,404,007
7
8
Cam 53 then releases shaft .22 for rotation
through a, third step, causing cam 420 to lift
the extension 68 on the bail member 41 which by
this time has been moved back into normal posi
tion by its spring. Immediately the lever ‘I3 re
cam lever Mic and interp-osing member 390 mo
mentarily. The projection Mo on interposing
leases escapement 69 the hump on cam '|| moves
member 390 is below bail member 46 and this bail CI clear of cam projection 12 on cam lever I6 thereby
member is rotated anti-clockwise. An extension
permitting the extension I’! thereon to be moved
59 on bail member 46 is removed from engage
ment with an escapement member EB ?xed to a
by spring 31 ‘against the extension l8 on lever l9.
an escapement member 39 ?xed to a sleeve ‘Ill.
Sleeve ‘iii is driven through a friction clutch (not
The time taken for an uninterrupted half revo
lution of sleeve 10 is the duration of two time
Thus when lever I9 is reset by the last hump on
sleeve 6| which‘ is frictionally driven by means
the resetting cam 29, lever I9 is held in the path
of a clutch (not shown) from shaft 5|. Sleeve 10 of escapement member 2| by extension I‘! on lever
6| carries a cam 63 which acts on cam lever 5'1
l6. Shaft 22 thus comes to rest at the‘ end of
and so rotates sleeve 58 and cam lever 56 to
its revolution.
cause pin 66 to actuate contacts 61 to transmit a
During the last step of shaft 22, cams 30a and
dash. Escapement member 69 has one tooth‘ only
39b act on the rollers carried by frame 3| to
so that sleeve 6| executes a full revolution. Just
rotate frame 3| in an anti-clockwise direction
before the completion of the revolution cam 62
thereby releasing the combination bars and‘also
acts on cam lever 64 ?xed to shaft |5 to rotate
permitting pawl I3 to be lowered onto an abut
that shaft and lever It clockwise and this re
ment ‘I8, so that the frame 3| is disengaged from
sults in shaft 22 and escapement member 2| be~
step 16 and the pawl I3 re-engages with lever I4.
ing releaser for a fourth step.
If, during transmission of the signal above de
If during the fourth step of shaft 22, bail mem
scribed, pressure had been applied to another key,
ber 56 were again to be rotated anti-clockwise as
immediately the combination bars are unlocked
for some other character, extension 55 would
by the action of cams 30a and 3%, the second
be removed from the path of the tooth on escape
key will go down, thereby resetting the combina
ment member 333 at the correct instant to allow
tion bars and the trip bar. The pawl l3, acting
of the rotation of sleeve 8| continuing uninter
on the lever l4, releases the lever l9 so permitting
ruptedly.
the shaft 22 to make the ?rst step of the next
The fourth step of shaft 22, in the case con
revolution. This action is so timed that the shaft
sidered, causes cam 42d to lift cam lever 40d and
22 can move through its normal stopping posi
interposing member 39d momentarily. The pro
tion without being arrested. It is to be noted that
jection 64d on interposing member 33d accord
the combination bars are left in the positions into
ingly moves bail member 13'! anti-clockwise to re
which they were set, but when unlocked are free
move extension 68 thereof from engagement with
to be reset by another key bar.
shown) from shaft 55 and accordingly rotates.
Escapement member 69 also co-operates with one
units during which contacts 67 remain open and
arm of a two armed lever ‘I3 urged in a counter
this, added to the space of one time unit duration
transmitted during the rotation of sleeve 50 or
clockwise direction by a spring 1'5. and when es
of sleeve 6| , completes the normal letter space of
capement member 69 has rotated through ap
proximately one third of a revolution it will be
arrested by the end of the two armed lever 13. In
three units. To the extent that sleeve ‘I0 is ar
rested before it completes a half revolution the
letter space is prolonged until shaft 22 has com
pleted a revolution. The speed of rotation of
this position the hump on a cam '|'|, ?xed to
sleeve ‘It, will engage with a cam projection ‘I2
on lever I6 and this lever will be moved against .
shaft 22, however, when rotating uninterruptedly
spring 37 and held in such position that extension
is such that the prolongation of the letter space
beyond three units duration is only very slight
ll thereon is clear of extension I8 on lever I9.
and cannot exceed, even in the case of the short
Lever is is accordingly withdrawn by spring 34
est signals, something less than two units. There
from engagement with escapement member 2| on
is no prolongation at all in the case of signals
shaft 22, which accordingly rotates. As the shaft
having the maximum number of elements.
To
‘22 rotates, the next hump on the resetting cam
take care of a letter space completing such sig
29 will reset the lever I9 as before, but the lever
nals a seventh cam 429 is provided on shaft 22
I5 is not now able to spring up behind the ex
which acts on a seventh interposing member 43.
tension it! to hold the lever IS in the path of
This latter member is not controlled by a com
escapement 2|. Lever I9 therefore moves out 55 bination bar but is ?xed with its nose under
wards clear of the path of escapement 2| and
neath bail member 41. At the end of the signal
shaft 22 continues to rotate. Cam 29 continues to
elements transmitted under control of cams
reset lever I?) as each hump passes the cam lever
42a . . . 421‘ and interposing members 390. . . .
28 but'witho-ut arresting the escapement 2|, as
39f acting on bail member 45 and/or bail member
in each case, after the cam lever 28 has passed
66, interposing member 43 lifts bail member 41
the hump on the cam 29, lever I9 is withdrawn
and so allows sleeve ‘I0 to rotate. This rotation
again from the path of escapement 2| under the
of sleeve ‘I0 is uninterrupted for half a revolu
action of spring 34. Shaft 22 therefore, rotates
tion, cam ‘I4 removing two armed lever ‘I3 from
continuously through the remaining steps of the
engagement with escapement member ‘69 at the
revolution. The cams 132e, 421‘ and 42g actuate 65 correct instant to allow of sleeve 10 not being
their corresponding interposing members which
arrested thereby.
are all in the space position to move bail member
ill in an anti-clockwise direction, but without any
effect on the escapement member 69 because it
The maximum speed of transmission with the
transmitter of Figs. 1 and 2 is attained when a
key is actuated and the ?nger of the operator
is held by the end of two armed lever 13.
As the hump on the last cam 42g passes its as
70 passes immediately to another key and actuates
that as soon as possible. As previously described
sociated cam lever, the hump on a cam ‘I4 ?xed
the keyboard is locked in such manner that one
to shaft 22 actuates the two armed lever 'I3‘to
actuation of a key results in one transmission
release the escapement 69. The escapement 69
only of the character represented by the key,
completes its half revolution and is arrested by 75 however long the key is kept actuated, and after
2,404,007
10
actuation of one key for one signal, transmission
of a further signal is prevented until either (a)
the‘?rst transmission is completed or (b) the
actuated key is released, whichever happens’ last.
It is also the case with the arrangement shown
in Figs. 1 and 2 that not only is transmission of
a further signal prevented but also operative ac
tuation of a key is prevented whilst the combina
tion bars are locked in position during the trans
mission of a signal.
Certain keys can, however,
be partially depressed whilst the combination
bars are locked, i. e. such keys as have keybars
that are presented with either a full‘ or a half
An extension on the underside of the keybar
corresponding to the letter E abuts against one
end of a two armed lever I00 and when the key
is actuated this lever I00 is rotated in an anti
clockwise direction, raising a latch is! carried
thereon. This latch engages a detent lever I92
and raises it clear of a stop arm Hi3 ?xed to a
sleeve I04 frictionally driven from the shaft 5i.
Sleeve Illli is therefore permitted to rotate until
a stop cam H9 carried thereon is arrested by a
cam lever I28.
Cam lever I253 co-operates with a cam I 2I on
shaft 22 and if this last mentioned shaft has been
rotated. from its initial position cam I2I allows
way notch in each combination bar or with a full
notch in some bars and a half notch in others. 15 cam lever I20 to be moved into the path of stop
arm H9. The key for letter E can thus be actu
The operator may therefore receive the impres
ated even if the machine is engaged in transmit
sion that a key has been actuated when in fact it
ting signals and the keys that co-operate with
has not and no transmission of the. signal has
the combination bars and trip {bar are locked.
taken place. In order‘ to overcome this slight
difficulty additional combination bars are ar 20 The short movement of sleeve I04 between its re
lease by movement of detent lever I62 and its ar
ranged, cut in such a manner that, with the six
rest by cam lever I29 is sul?cient to cause cam I05!
combination bars above described, they prevent
0n sleeve IM to rotate lever I08 in a counter
depression of any key. even half way, when they
clockwise direction. A tooth On the end of lever
are locked during the transmission of a signal.
I08 presses against the end of latch IOI so dis
The additional combination bars do not act on
engaging that latch from detent lever I92 and
the transmitting mechanism and merely co-op
allowing the latter to be returned into the path
erate with the frame 3| for locking purposes.
of stop arm I03. It, now the E key is released
The preferred manner in which the notches in
these additional combination bars are arranged
in relation to the key bars for the’ purpose above
stated will be clear from the following;
For co-operation with the transmitting mech
anism it is immaterial which positions of a com
bination bar represent which elements. It is
only necessary to arrange that the frames 45, lit,
41 corresponding to the three positions release the
appropriate cam sleeves. Any combination‘bar
and lever H10 and latch IIlI return to their initial
positions, the tooth on the end of lever IIlB en
gages tooth Ill‘! and holds latch IIJI and lever Ills
against a second actuation. Lever I08 is ?xed to
rod I39 to which also is ?xed a lever I28, so that
when lever I68 is rotated anti-clockwise lever I28
rotates with it and engages latch I24 to prevent
actuation of the “word space” key until trans
mission of letter E is completed.
At the same time a cam I It on sleeve Ill-‘l moves
moved into one extreme position will prevent any
a
cam lever I II in clockwise direction. Cam
movement of all key bars to which it presents the
condition for the opposite element, but will not 40 lever I I I is ?xed to a second cam lever I I2 having
an extension 5 I5 and this extension is thus raised
prevent the movement of key ‘bars to which it
presents the condition for the same element or
for the element represented by the middle posi
tion.
If the middle position or each link 5 repre
to the rear of a latch Ilia.
When the mechanism shown in Fig. 4 is added
to the keyboard transmitter of Figs. 1 and 2, the
sents a space element as in the embodiment de~
scribed, then the characters‘ can be arranged in
groups, those in each group containing the same‘
number of elements, such that for any character
in any one group the six combination bars are
latch is shown in the latter is modi?ed into the
shape shown at Eda in Fig. ll and no longer
purpose previously described. Fig. 4 also shows
the manner in ‘which the latch lever I2, pawl I3
During the further rotation of sleeve I04 a cam
H6 thereon. acts on a cam lever II ‘i to actuate
co-operates directly with the frame 3|. Instead,
the frame SI carries a pin I22 which passes un
derneath the extension II5 of cam levers I II and
set in. positions that prevent any actuation of a 50 I i2. Thus when extension i I5 is raised either by
the movement of frame 3i when shaft 22 moves
key in the same group. It only remains there- '
from normal position, or by the action of cam
fore to arrange additional combination (bars cut
I EU on cam lever I I I, latch I3a is prevented from
the same for the keybars of the characters in any
moving into engagement with lever I4.
one group but differently for characters in differ
Thus the trip bar is locked until the transmis
ent groups so that the setting of these additional 55
sion of the letter E is completed. The movement
combination. bars by a key in any group shall pre
of sleeve E84 out of normal position stores the
vent the actuation of a key in any of the other
letter E until the transmission of any other signal
groups. There are six such groups and thus the
is completed. When this latter transmission is
minimum number of such additional combination
completed and shaft 22 returns to normal posi
bars is three, out so that they are set in a differ~ a
tion cam lever I29 is moved by cam I2I out of
ent combination of dots and dashes‘for each of
engagement with stop arm I I9 and sleeve I64 con
the six groups of characters.
'
tinues its rotation. If the shaft 22 were in its
Fig. 4 shows means by which the keys’ for letter
normal position when the key for letter E was
E and the word space are disassociated from the
depressed, the sleeve Hill would not be arrested
combination bars and from the tripv bar and in
by lever I2il but would continue its rotation.
stead actuate an independent mechanism for the
and frame 3i of Fig. 2 are modi?ed to accommo
date the separate mechanism. .for transmitting
the two signals above mentioned. The latch
lever I2 of Fig. 4 is divided into two parts Ila
and I2?) Iboth ?xed to a rod 5%. The part I20.
co-operates with the pin II, Fig. 2, whilst part
I2a has mounted thereon a pawl Ba.‘
'
_
contacts M8 to generate a dot and the letter
space following it thus transmitting the letter
' E.
Contacts H3 are arranged in parallel with
contacts 6'? of Fig. 2. When sleeve I04 reaches
its initial position it is arrested by re-engagement
of lever I92 with the stop arm H13. Cam I05)
, allows cam lever N28 to be moved clockwise clear
2,404,007
ll
of latch IElI and with it lever I28 clear of latch
12
1. A keyboard operated Morse code transmitter
comprising a plurality of keys each representing
I24 and cam Ill! allows cam lever III to move
anti-clockwise and remove extension H5 from
the path of latch I3a. Another signal can then
be transmitted.
The key bar for the word space is also arranged
so that, when it is depressed, it does not actuate
key character means common to all keys for caus
ing transmission of said elements in sequence in
the combination bars or?the trip bar. Instead,
accordance with the operations of said selectively
a character, means common to all keys and se
lectively actuated by each key for analyzing into
elements the Morse signal corresponding to the
it acts to move anti-clockwise a two armed lever
actuated means, and means for returning the
I23, similar to lever Hi9 to which is pivoted a 10 transmitter to transmitting position after the
latch I24 similar to latch I ill. Latch I24 raises
?nal element of said signal has been sent.
a detent lever I125 out of engagement with stop
2. A transmitter as set forth in claim 1 includ
arm I25 on a sleeve H4 driven through a fric
ing a key bar associated with each key, in which
tion clutch from shaft 5i. Sleeve I I4 commences
the means for analyzing said signal comprises
to rotate and a cam I27 moves cam lever I28 to 15 combination bars and means controlled by the
press against the end of latch I24 and disengage
key bars, selectively placing the combination bars
in position.
it from detent lever I 25 and so allows that detent
3. A keyboard operated Morse code transmitter
lever to be returned into the path of stop arm
comprising a plurality of keys each representing
I26. Lever I (38 moves with lever I28‘ and engages
the tooth on latch IEII to prevent actuation of 20 a character, a plurality of combination bars and
control means actuated by the operation of each
the key for letter E. If the word space key is
key for selectively setting all of the combination
released and latch I24 returns to initial position
bars to give positions corresponding to the ele
the hook on the end of lever I28 engages the
ments of the Morse code signal representative of
tooth on latch I24 to prevent a second actuation
of the space key until the sleeve I I4 reaches nor 25 said. key and causing said elements to be trans
mitted in correct sequence.
mal position. ' If shaft 22 is out of normal posi
4. A transmitter as set forth in claim 3, in
tion sleeve I I4 is arrested after a small movement
which the number of combination bars is one
by cam lever I20 engaging with a stop arm I29
less than the maximum number of elements in
on sleeve IM. C‘am H3 on sleeve H4 acts on
cam lever M2 to raise extension H5 thereof be 30 any signal, means for selectively setting said bars
by the operation of keys representative of signals
hind latch 3a and prevents its movement.
Sleeve I M does not carry a cam operating on con
tacts as its function is solely to introduce a time
delay corresponding to the space between Words.
having di?erent numbers of signal elements and
means for setting each bar not required for the
elements of a signal in a position corresponding
,
Sleeve I I4 may be arranged to make either a half 35 to the last element of a signal.
5. A transmitter as set forth in claim 3, in
revolution or a full revolution at each release
which the number of combination bars is one
less than the maximum number of elements in
any signal, said control means being e?ective for
It is clear that the key for the letter T could,
if desired, be disassociated from the combination 40 setting said bars by the operation of keys repre
according to the time interval required between
words.
I
,
bars and caused to release a separate cam sleeve
for the transmission of that letter in a manner
sentative of signals having only the maximum
number of signal elements, means responsive to
the actuation of each of the latter keys for caus
ing the transmission of the last signal element
independently of the combination bars, said con
similar to that shown in Fig. 2 for the key for
letter E and the word space key and would be
interlocked with the mechanism shown so as to
trol means being effective for selectively setting
store the letter T but prevent transmission of any
said bars by keys representative of signals having
other signal until transmission of the T signal
less than the maximum number of elements, and
was completed.
responsive to the actuation of each of the latter
The mechanism above described may be com
bined with a recorder for recording received sig 50 keys for setting in a position corresponding to the
last element of a signal each bar not required
nals upon a tape in the manner shown in Fig. 1.
for the elements of a signal.
There is shown in that ?gure a receiving mag
6. A keyboard operated Morse code transmit
net 80 the armature 8! of which is withdrawn
ter comprising a plurality of keys each represent
from the magnet, when not attracted thereto by
energisation of the magnet, by a spring 94. The 55 ing a character, means selectively actuated by a
key for analyzing into elements the Morse signal
armature 8! is provided with an extension 82,
which, when the armature is attracted produces ‘ corresponding to the key character means com
mon to all keys for causing transmission of said
marks on a tape 89 by striking it against an
elements in sequence by and in accordance with
inked roller 83. The inked roller is mounted on
shaft 84 driven from motor 25 through gearing 80 the operations of said selectively actuated means,
85, and is inked by means of an inking roller 91 '
said analyzing means including a plurality of
combination bars and means controlled by ac
which dips into a bath of ink and is mounted on
a lever 92 urged by a spring 93 lightly against
tuation of a key for setting said bars into selected
roller 83. The tape 89 is drawn from a roll 9.!
position corresponding to the key character, three
by means of feed rollers 88 and 5D. Roller 88 is 66 separate means for transmitting the three dif
mounted on shaft 8? driven from the motor
ferent signal elements, means controlled by the
through gears 86.
setting of a combination bar for causing actua~
A send-receive switch (not shown) is provided _\
tion of the corresponding transmitting means,
to connect either the transmitter or the recorder ‘ and distributor means for controlling the se
to the transmission medium and the lever that .70 quence of actuation of the different transmitting
operates this switch may also move shaft 81 to
means.
i
remove roll 83 from pressure against feed roll
7. A keyboard operated Morse code transmitter
90 when the switch is in send position and so
comprising three separate and structurally dis
stop the feed of the tape.
What is claimed is:
4
tinct and independent selectively operative means
_for transmitting the three different elements of
2,404,007
comprising three separate selectively operative
14
fective upon actuation of an operating key for
preventing the action of any key on the combi
nation bars until said short signal has been
transmitted.
a Morse code signal, and key actuated means for
determining the proper sequence in the opera
tion of said selectively operative means.
8. A keyboard operated Morse code transmitter
Ill
16. A transmitter as set forth in claim 13, com
prising a plurality of keys each representing a
means for transmitting the three different ele
short signal, a plurality of cams, means for ro
ments of a Morse code signal, key actuated means
tating said cams, means for releasing each cam
for determining the proper sequence in the oper
forrotation actuated by operation of a key, and
ation of said selectively operative means, the sep
arate transmitting means each comprising a sep 10 means effective upon actuation of any short sig
nal key for preventing actuation of any other of
arately driven cam, key controlled selectively op
said keys.
erative means determining the operative move
1'7. A keyboard operated Morse code transmit
ment of each of said cams, and means actuated
ter comprising a plurality of keys each repre
by its associated cam for generating the respec
senting a character, a plurality of combination
tive signal element.
bars and means selectively actuated by the op
9. A keyboard operated Morse code transmitter
eration of each key for setting the combination
comprising a plurality of keys each representing
bars in positions corresponding to the elements
a character, means operated by actuation of a
of the Morse code signal representative of said
key for analyzing into elements the Morse signal
corresponding to the key character and causing ,_ key and causing said elements to be transmitted
in correct sequence, each combination bar com- '
transmission of said elements in sequence, said
prising a pair of code bars arranged side by side,
means for causing transmission comprising a dis
means whereby selective movement may be im
tributor shaft, means for rotating the shaft by
parted to said code bars by a key bar, or no move
steps, means operated by key actuation for re
leasing the shaft for rotation, means operated .. ment will be imparted to either code bar, and link
means connecting adjacent ends of a pair of
by the shaft during rotation for transmitting the
signal elements in correct sequence and means
for controlling the shaft rotation to provide one
step of rotation for each signal element to be
transmitted.
10. A transmitter as set forth in claim 9, com
prising means actuated by the transmission of a
space element of a signal for returning the dis
tributor shaft to starting position.
11. A transmitter as set forth in claim 9, com
prising means for locking the keys against actu
ation when the distributor shaft is out of start
code bars so arranged that, when one code bar
is moved in one direction the other code bar is
moved in the opposite direction, whereby the link
may be located one of three positions according
to the order of the code elements represented by
the actuating key bar.
18. A transmitter as set forth in claim 3, in
which each combination bar comprises a pair
of code bars, key actuated means for shifting a
code bar vertically and link means connecting
registering ends of each pair of code bars for
ing position.
moving said code bars in opposite directions, addi
12. A keyboard operated Morse code transmit
ter comprising a keyboard, means actuated by
the keyboard for transmitting code signals of
different lengths, means for locking the keyboard
cluding said additional combination bars effec
tive upon actuation of a key for holding all other
against operation during the transmission of sig
nals, and short signal means operative after the
tional combination bars movable only into ex
treme upper and lower positions, and means in
keys against actuation.
19. A keyboard operated Morse code transmit
transmission of a signal of less than maximum 45 ter comprising a plurality of keys, key bars op
erated thereby, interposing members having three
length for unlocking the keyboard.
ter comprising a plurality of keys each represent
set positions, means including three independ
ently rotatable cam sleeves for transmitting three
ing a character, a plurality of combination bars
and means actuated by the operation of each a
each associated with a cam sleeve, a distributor
13. A keyboard operated Morse code transmit
key for selectively setting the combination bars
in positions corresponding to the elements of the
Morse code signal representative of said key and
causing said elements to be transmitted in cor
rect sequence, and separate means for trans
mitting a short signal, said latter mean being
independent of the combination bars and includ
ing an operating key representing said signal.
14. A transmitter as set forth in claim 13, com
prising means operative upon actuation of the
latter key during transmission of a signal con
trolled by the combination bars for storing said
short signal upon the actuation of said latter
key and causing the transmission of said short
signal immediately after the completion of the
signal controlled by the combination bars.
15. A transmitter as set forth in claim 13, in
which said separate means comprises means ef
different elements of a code signal, bail members
shaft, means operated by actuation of a key bar
for setting the interposing members in conformity
with the elements of a code signal, means op
erable upon actuation of a key bar for releasing
said distributor shaft for rotation through one
step, means on said distributor shaft operated
during each step of the rotation for actuating
a separate interposing member to move one of
said bail members, means operated by said move
ment of a bail member for releasing the associ
ated cam sleeve for rotation, means actuated
upon the completion of rotation by either of two
of the cam sleeves for releasing the distributor
shaft for movement through a further step, means
operated by the third cam sleeve for releasing
the distributor shaft for rotation into its original
position, and shaft rotating means.
ALFRED EDWARD THOMPSON.
REGINALD DENNIS SALMON,
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