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Патент USA US2116649

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May“), 1938-
Filed Jan. 16, 1935
Patented May 10, 1938
Glenn W. Watson, Binghamton, N. Y., assignor
to International Business Machines Corpora
tion, New York, N. Y., a corporation of New
Application January 16, 1935, Serial No. 2,062
3 Ulalms. (Cl. 178—35)
The principal object of the present invention
' The present invention relates to a communica
tion system and more particularly to printing is to provide an improved method and apparatus
telegraph systems applicable to radio and line for the transmission of intelligence.
Further and other objects of the present inven
tion will hereinafter become apparent in the ac-_
The invention embodies the use oi synchro
nized disks or distributors at the transmitting companying speci?cation and claims and shown
and receiving stations for completing the trans
mitting and receiving circuits respectively, simi
lar to the synchronization system disclosed in the
application Serial No. 684,362, ?led August 9,
1933. Heretofore, similar systems employed
means for transmitting independent and different
character impulses to activate the receiving cir
cuits for each character to be transmitted and
In the present invention, a'continuous or pro
longed impulse is employed and transmitted dur
ing the intervals transmission of characters is
not occurring, so that when used in conjunction
with the aforementioned synchronized disks, the
20 characters at the receiver are recorded which
, correspond to the transmitted characters by dis
continuing the continuous impulse or causing a.
void impulse at the proper moment in the con
tinuous ‘cycle to represent tne particular charac
in the drawing which by way of illustration is
what is now considered to be the best mode in
which it. has been contemplated applying that
principle. @ther embodiments of the invention 10
employing the same or equivalent principle may
be used and structural changes made as desired
by those skilled in the art without departing from
the'present invention and within the spirit of the
appended claims.
One form of the invention is fully disclosed in
the following description and in the accompany
ing drawing which shows a diagrammatic view
of the apparatus.
Referring now to the drawing, the transmitting
and receiving units include a conventional or
modi?ed typewriter having a series of lettered
and numbered pivoted key bars I. 0ver the bars
is mounted a roll 2 held in a slidable carriage
(not shown) in the usual manner so that it is
moved one space on depression of any key bar.
ter to be transmitted.
The present invention will be explained in con
junction with a single impulse system, in which
the diiferent characters to be transmitted are
Each key bar has associated therewith a type bar
3 adapted to strike against the roll 2 on depres
represented by single impulses which are de?nite
ly allocated during timed intervals to control the
transmitter accordingly. Broadly, the system
involves the shifting of the character impulse
along the axis of a timed scale, the position of the
impulse thereon determining the character to be
sending distributor 6 carries a series of spaced
contacts 6 corresponding respectively to the vari
The single impulses originated representing the
characters are adapted to discontinue a contin
uous or prolonged impulse radiated by the trans
40 mltter of the system at the corresponding time
the particular pulses are initiated. The continu
ous impulse transmitted is adapted to maintain
the receiver inoperative, by way of example, one
form of which is shown as a photo cell circuit that
45 remains activated by a light source energized by
the continuous impulses. ' The'discontinuance of
sion ‘of the corresponding key bar. 7 This action.
is effected through a suitable linkage 4, between
each key bar and its corresponding type bar. A
ous characters on the type bars i. The con- '
tacts are engaged in rather rapid succession by‘ a 85
rotary contact arm ‘I driven by “a motor 8, which
is in synchronism with the similar device at the
other end of the transmission circuit and which
is fully described in the prior application stated
_ hereinbef ore.
Each of the key bars I is comprised in a branch
condenser circuit embodying a common conduc
tor I! in which is comprised a condenser charg
ing battery l3. A line‘ i5 is extended from one
side of the battery l3 and is branched separate 45
ly to a series of contacts l6 disposed respectively
beneath the key bars I and normally spaced from
the pulse at a particular timed period within a
timed interval is adapted to energize the receiv " the latter when the bars are in their normal or
ing unit at that period to record the particular raised position. The common conductor l2 ex
tending from the other side of the battery 53 is
50 character.
Numerous advantages are to be obtained from branched at" to each of the bars I, and in each
a system of this type employing the disclosed of these branches is inserted a condenser l8.
Thus, when any of the bars I is depressed, the
principle, one of which is the reduction of natural
or arti?cial interference usually present in sys corresponding branch condenser circuit will be
tems of this type.
completed at the contact l6 engaged by the de
pressed bar, and the corresponding condenser it
will be charged from the battery l3.
The sending circuit embodies a conductor it
joining the arm 1 from the condensers l8 and in
cluding therein the relay 9. The other side of
this circuit is branched by conductors 20 extend
terminals are joined by a common conductor to
the output of a suitable ampli?er represented by
way of example by the thermionic tube with its
anode connected to the said common conductor.
The output of the receiver 30 has embodied
therein a suitable light source such as a neon
ing separately from the contacts 6 on the disk 5
tube 50 adapted to be energized by the trans
to ?xed contacts 2| positioned over the key bars .
mitted continuous
l. The latter contacts are engaged by the cor
10 responding bars I when the latter are in raised
or released position and at such time close a
sending circuit consisting of the conductor i9,
a corresponding condenser l8, contact 2i, con
ductor 20, contact 6, and arm TI.
The radio transmitter 22 has one of its output
terminals connected to an antenna 23 and its
other output terminal 213 grounded in the usual
The input terminals are connected to
or prolonged impulse im
pressed on the receiver 30. The light source dur
ing these periods of energization is directed upon
and adapted to activate the photo cell 5| in a
well known manner. The grid of the amplifier
tube 618 is connected in a standard manner to the
anode circuit of the photo cellv5l so that so long
as the cell 5! is energized by the light source 50
the grid of the tube 68 is biased to a degree that
the current in the ampli?er plate circuit is de
creased so as to be ineffective to energize and
the armature 25 of relay 9 and its contact it
20 which normally remain in engagement so that
the input circuit of the transmitter remains
closed during the timed intervals the relay 9 re
mains deenergized and in this manner, the trans
operate the solenoids 38 during the intervals the
mitter 22 is adapted to radiate a continuous or
and in turn the photo cell 5| becomes deener—
prolonged impulse.
gized tending to make the grid of the amplifier
more positive with respect to the plate and in
In the operation of the device as thus far de
scribed, it will be seen that the depression of a
key bar l ?rst breaks the corresponding branch
circuit at the contact 2i and closes one of the
30 branch condenser circuits to charge the corre
sponding condenser it. On return of the key bar
5 into engagement with its contact M, the send
ing circuit will be closed when the arm ‘i reaches
the corresponding contact 6 on the disk 5.
The closing of the sending circuit in this man
ner energizes and operates the relay 9 to open
its normally closed contact l0 causing the trans
mitter input circuit to be deenergized to ter
minate the prolonged or continuous transmitted
impulses at the particular point in the prede
termined timed interval cycle to represent the
particular character initiating the relay ener
gizing or transmitter deenergizing'impulse, thus
arm £12 engages the respective contacts ti. How
ever, when a void impulse is transmitted and re»
ceived, that is the discontinuance of the prolonged
impulse, the light source 50 becomes deenergiz’ed
crease the current ?ow in the plate circuit to the
extent that upon the engagement of a particular
contact ill at that moment by the contact arm
:32 the corresponding solenoid embodied in the
completed circuit is su?iciently energized to oper
ate the said solenoid.
Therefore it is seen that each time the pro
longed or continuous impulse is discontinued the
solenoid 38 included in the circuit completed by
the contact arm‘?Z and contacts M is energized
sut?ciently by the current ?ow from the ampli?er
48 to operate the said solenoid. The character
corresponding to this contact M is printed on
the roll 2 at the receiving station. These char
acters printed will appear in the same order in
which they are sent inasmuch as the arms ‘I and
132 are in synchronism and always in like rela
creating a void impulse or timed interval during - tion to the contacts engaged thereby, and since
45 the continuous transmission of the continuous
A description of the receiving apparatus and
its operation to effect the recording of a char
acter corresponding to the character setting up
50 the void condition described will now be ex
the discontinuance of the prolonged impulse it
created only when the arm ‘I at the sending
station engages the contact 6, corresponding to
the key which has been depressed.
It will be noticed that the receiving contacts at
are of greater length circumferentially than the
sending contacts 6. In fact, the latter are made
The receiving circuit of the apparatus includes
as short as possible in order that the initiated
a receiver 30 having one of its input terminals
grounded at at and its other input terminal con
55 nected to an antenna 32 and adapted to receive
the prolonged or continuous impulse referred to
and sent out from the antenna 23 in the usual
impulse and created void impulse may be instan
taneous. The longer receiving contacts 4H, how
ever, hold the receiving circuit closed for an
interval sui?cient to enable energization of the
solenoids 38 and operation of the type bars 3,
Beneath each of the key bars 6 is a ' as well as allow for slight inaccuracies in the
solenoid 38 adapted to operate on a plunger 39 in synchronism of the transmitting and 'receiving
60 the form of a ?nger depending from'the bar so _ arms ‘I and d2 respectively.
While there has been shown and described and
that when a given solenoid is energized by means
presently to be described, the corresponding key pointed out the fundamental novel features of
the invention as applied to a single modi?cation,
bar will be depressed to actuate the correspond
it will be understood that various omissions and
ing type lever 3. The receiving circuit is gov
65 erned by a disk or distributor 40 carrying spaced substitutions and changes in the form and de
tails of the device illustrated and in its operation
contacts til corresponding in number and posi
tion to the contacts 6 on the disk 5. A contact may be made by those skilled in the art without
arm 62 rides over the contacts Q0 and is driven departing. from the spirit of the invention. It is
by a mechanism such as a motor M and rotating the intention therefore to be limited only as in
70 in synchronism with the motor 8, in a manner dicated by the scope of the following claims.
What is claimed is:
similar to the described method in the said prior
1. A communication system of the character
One terminal of each of the solenoids 38 is described comprising, in combination, means to
separately connected ‘to one of the corresponding receive a continuous or prolonged impulse, the
75 contacts M by conductors t6, the other solenoid discontinuance of which at predetermined'timed
intervals representing various character desig
cording means controlled by said circuit and op
nation signals, a light source controlled by said
receivingmeans, a circuit including light sensi
erated in accordance with the character signals
tive means controlled by said light source so that
upon discontinuance of the prolonged impulse a
source of current energizes said circuit, and re
3. A communication system of the character
described comprising, in combination, means to
cording means controlled by said circuit and op
erated in accordance with the character signals
upon energization of said circuit.
2. A communication system of the character
described comprising, in combination, means to
receive a continuous or prolonged impulse, the
discontinuance of which at predetermined timed
intervals representing various character desig
15 nation signals, a light source energized by said
receiving means during the transmission of ‘the
prolonged impulse, a circuit including light sensi
tive means controlled by said light source so that
upon discontinuance of the prolonged impulse a
20 source of current energizes said circuit, and re
upon energization of said circuit.
receive a continuous or prolonged impulse, the
discontinuance of which at» predetermined timed
intervals representing various character desig
nation signals, a light source controlled by said
receiving means, a circuit including light sensi 10
tive means controlled by said light source so that
upon discontinuance of the prolonged impulse
a source of current, energizes said circuit, means
operating in synchronism with said character
signals, a recording device controlled conjointly 15
by the last mentioned means and said circuit to
operate the recording device in accordance with
the character signals upon energization of said
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