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Патент USA US2131920

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Oct. 4, 1938.
Filed May 12, 1957
2 Sheets-Sheet l
Tmma KEY
Oct. 4, 1938.
Filed May 12, 1937
2 Sheets-Sheet 2
FIG. 7.
FIG. 8.
Patented Oct. 4, 1938
' 2,131,920
Harry J. Nichols, Binghamton, N. 12, assignor to
International Business Machines Corporation,
New York, N. Y., a corporation 01' New York
Application May 12, 1937, Serial No. 142,093
9 Claims. (Cl. 178-—2)
called the serial number service, service charges
This invention relates to a communication sys
tem and more particularly to a time printing
mechanism for printing telegraph systems. The
present application is a continuation in part of the
5 copending application Serial No. 759,933, ?led De
- cember 31, 1934.
are based on the accumulated time of a series of
messages. The invention a?ords means for the
automatic summation of the time of a series of
In accordance with the present invention,
It is the principal object to provide in a very each original message may have the time groups
simple and e?ective manner for the measure-' printed thereon at the proper points for compu
ment of the time required for the transmission tation of the time of transmission, and the re
of messages in a printing telegraph system and ceived copy have printed thereon the identical
also to provide for the ‘printing of time indica
tions showing the time of transmission of such
time groups.
tomer and the communication companies is min
A fuller understanding of this invention will
be had upon reference to the drawings in which:
Fig. 1 shows schematically the circuits and ap
paratus of a preferred embodiment of the inven
It is a further object to provide a time print
ing mechanism adapted to ‘print time indications
at the beginning and end of a typedv message di
rectly on the face of the message, such indica
tions showing the time required for transmis
' sion.
It is a further object of the invention to pro
vide a method and apparatus whereby the print
ing at the sending end of a printing telegraph
system, in addition to printing time indications
on the original of the message, will transmit the
' proper signals to cause the same indications to be
Fig. 1a is an end view of the clutch actuating
mechanism of Fig. 1 shown in the engaged posi
Fig. 1b is similar to Fig. 1a, but shows the
clutch actuating mechanism in released position; 25
Fig. 2 shows a detailed side view in part section
of the cyclometer mechanism and decimal switch
printed on the received copy at the receiving end
of the system, so that the original and the re
ceived copy each show the elapsed time of trans
ing mechanism schematically indicated in Fig. 1;
mission "of the message.
Fig. 2 taken along the axis 3-3 as indicated;
It is also an object to provide a system for I
Fig. 3 is a sectional view of the mechanism of
Fig. 4 is an end elevational view of the mecha
quickly and easily indicating thesummation of
nism of Fig. 2 as viewed from the right hand end
time required for the transmission of a series of
messages, sent either continuously or intermit
“tenths” decimal switch structure of Fig. 2, show-' 35
ing the arrangement of the contacts;
Other objects and features will be in part.
obvious, and in part hereinafter pointed out in
connection with the following description, the
accompanying drawings,
Consequently, the possibility for
differences as to time charges between the cus
and the
Certain types of printing telegraph messages
are charged for on the basis of the time required
for the originating operator to transmit the mes
sage. The presentpractice is for an operator at
the control office of the communication company
to time the message in the same general manner
that long distance telephone messages are timed;
or in some cases of large installations, the orig
inating operators stamp each message sheet in
an automatic time stamp just before the sheet
is inserted in the transmitting printer, and im
mediately upon withdrawal therefrom. From
the time stamps, the time required for transmit
ting the message is computed for service charge
In another class of printing telegraph service,
Fig. 5 is a detailed view, in part section, of the
Fig. 6 is a detailed view in part of the sequence
mechanism start-stop pawl arrangement;
Fig. 7 shows in part one form of printing tele
graph unit;
Fig. 8 shows diagrammatically the embodi
ment of the present invention in a synchronous
communication system.
In the several figures, like characters represent
like parts.
Referring now to the drawings, which show a.
preferred embodiment of the invention, the tim
ing key TX is mounted on the printer keyboard
in the same manner as the printer actuating keys,
as for example the numeral keys “0” to “9” inclu- 60
sive, the "2” and “5” keys only being Shown 1'01‘
illustrative purposes. The printer actuating keys
operate the printer mechanism, and also func
tion to transmit printing signals to the receiving I
printer as indicated by the switch contacts 2', 5’,
etc. shown beneath the printer actuating keys.
The timing key does not actuate the printer
mechanism, but functions only to close contacts
l0 and thus the local timing circuit. Each print
er actuating key is provided with a key solenoid
| 2, l5, etc. which when energized pulls the key
down, thus actuating the printer mechanism.
The principal elements of the timing mecha
tion of timing key TK, irrespective of the time
TK is held depressed. During the revolution of
friction cam 33, sequence cam 33a closes contacts
34 and 35 in proper sequence and with the proper
interval between closures.
Referring now to Figs. la and 1b, as well as
Fig. 1, ?xedly mounted on drive shaft section 200
is ?xed ?ange 4| of positive clutch 40, while mov
nism are the drive shaft 20, the sequence switch
10 30, the clutch 40, the cyclometer 50 and the dec
able flange 42 is carried on a sleeve slidable
axially on drive shaft section 20b and secured
imal switch 60. Drive shaft 20 is driven by a
constant speed motor (not shown) which also
constitutes the drive means for the synchronous
mechanism of the printer. Hence drive shaft 20
15 rotates at a known speed, which may be assumed
for illustrative purposes as 450 R, P. M. Drive
shaft 20 is divided into two sections, namely con
tinuous section 20a. and intermittent section 20b.
Section 20a is in continuous rotation, while sec
20 tion 20b rotates only when coupled to section 29a
by clutch 40, in which case its rotation is the
against rotation thereon by pin 200, or other
preferred means. Throw out pin 42a is mounted
in ?ange 42 in a position to be engaged by trip
lever 43, which latter is ?xed on rock shaft 44.
same as that of section 20a.
Section 20a is step
pivoted in section 20b by a pin and socket hearing
or in other preferred manner.
Drive shaft 20 is
Fixed on one end of rock shaft 44 is shift plate
44a. with studs 44b and 440 mounted diametrically
as regards the axis of shaft 44, as clearly shown
in Figs. 1a and lb. A cover plate 45 is riveted
on the heads of studs 44b and 440, and mounted
thereon by stud 45a is spring ?nger 45b. Shift 20
head 46, which is T-shaped, works between studs
44a. and 44b. The free end of spring ?nger 45b
slides in a hole in stud 46a mounted on the stem
of shift head 46. Tractile springs 41a and 41b
25 shown broken into sections for clarity in illus~
move shift head 46 to the extended position, as
shown in Fig. 1a. Jockey spring 48 retains shift
Fixed on drive shaft section 20a is a wheel 2|
plate 44a in its alternate positions. Shift head 46
with resilient rim 2|a of rubber or the like. , is actuated by magnet 49, but if preferred, may be
Mounted adjacent thereto on parallel shaft 32 is actuated by release magnet 39, since both magnets
30 friction cam 33 adapted, when released, to engage are energized from the same circuit at the same
Wheel 2| and thus to rotate sequence switch 30. time.
Sequence switch 30 is shown cut into two sections
The operation of the clutch mechanism is as
in order to clarify the drawing. The sequence follows: Assuming for the sake of illustration that
switch comprises frictionv cam 33, sequence cam Fig. 1a‘ represents initial conditions, upon de
35 33a integral therewith, contacts 34 and 35, and pression of timing key TK shift head 46 is drawn
motional control means. Friction cam 33, pro
to the right as viewed. As indicated, spring
vided with, a knurled edge with a shallow notch ?nger 45b has previously lifted shift head 46 into
at the point normally adjacent wheel 2|, is nor . engagement with stud 44b, hence as the shift head
mally held out of engagement with wheel 2| by is drawn to the right, shift plate 44a, rock shaft
40 ‘pivoted pawl member 36 provided with two 44, and trip lever 43 are rotated clockwise. Trip
turned-down prongs, one positioned in advance lever 43 releases trip pin 42a, thus enabling spring
of the other, either one of which can engage pin 20d to engage the clutch faces. Drive shaft sec
33c mounted in the upper face of friction cam tion 20b is thus set in rotation by, and at the
33, depending upon the position of the pivoted same speed as, section 20a. Trip lever 43 is moved
45 pawl member. Accelerating spring 31 bears
clear of the path of trip pin 42a as shown in
against pin 33d mounted in lower face of cam 33 Fig. 1b, and is held in position by jockey spring
and tends to rotate cam 33 in the direction indi
48, hence there is no interference with the rota
cated by the arrow. Pawl 36 is actuated by re
tion of the drive shaft. Upon release of TK, shift
lease magnet 39, whose armature 39a is pulled in magnet 49 is deenergized, and tractile springs 41a
50 when release magnet 39 is energized, oscillating
and 41b return shift head 46 to extended posi
pawl 36 by means of link 39b.
tion. The tilting of shift plate 44a during actua
The operation of sequence switch 30 is as fol
tion has, however, caused spring ?nger 45b to
lows: When timing key TK is depressed, contacts exert a downward pressure upon stud 46a, hence
ID are closed, and the local timing circuit en
the shift head is moved into engagement with
55 ergizes release magnet 39. The circuit may be
stud 440, as shown in Fig. 1b.
traced from positive battery, via contacts l0,
Without further analysis, it will be evident that
through winding 39 and return to negative bat
upon successive draws of shift head 46, trip lever
tery. Armature 39a pulls in, pulling pawl 36 to 43 will be moved into alternate positions of re
the right as-viewed. Pin 330 is thus released, lease and engagement with trip pin 42a, and will
60 freeing friction cam 33 whereupon accelerating be retained in such positions between shifts by
spring 31 rotates cam 33 into engagement with jockey spring 48. When trip lever 43 is moved
wheel 2|. Cam 33 is rotated by wheel 2| almost into engaging position, trip pin 42a strikes the
an entire revolution, whereupon pin 330 is stopped inclined surface at the end of trip lever 43, and the
against one or the other of the prongs of pawl movable ?ange of the clutch is drawn away from
65 36, depending upon whether timing key TK is
the ?xed ?ange. As soon as the clutch faces are 65
released or held. At this point cam 33 is free of clear of each other, trip pin 42a is stopped against
wheel 2|, and accelerating spring 31 has been the notch in trip lever 43. For further detailed
reset. Assuming that timing key TK has been‘ description regarding the principle embodied in
held, pin 330 will strike the extended prong 36a the clutch actuating mechanism just described,
70 of detent 36; upon release of timing key TK, re
reference may be made to U. S. Patent No. 70
lease magnet 39 is_ deenergized, armature 39a is 2,049,468, particularly Figs. 5 and 6, which show
pulled away by tractile spring 390, and pin 33c and describe speci?cally mechanisms embodying
drops back against the short prong 36b of pawl such principles.
36, restoring initial conditions. Thus drive cam
It is to be noted that the clutch operation, as
75 33 makes but a single revolution for each actua— well as that of the sequence switch, is produced
by tripping action, and proceeds irrespective of
the length of time of depression of timing key
TK. In the case of the sequence switch, the same
cycle of operations results from eachdepression
of the timing key, while the clutch is alternately
released and engaged by successive depressions
of the timing key.
Referring now to Fig. 2,“"drive shaft 20b, when
coupled to the drive section, drives countershaft
plate 55 in any preferred manner, as for example
by moulding in position (see Figs. 2 and 5). Plate
65 is rigidly held intermediate contactors GI and
53; plate 65 also supports the brush holders for
brushes 62 and 54. The connections to station
ary contacts 65 and to brush 62, as related to
Fig. 1, are indicated in Fig. 5. The same set of
contacts are contacted by the two contactor ele
ments, but for clarity in illustration the station
ary contacts are shown separately in Fig. 1. Each '10
10 5| by means of worm 20g and worm gear Ila.
Countershaft 5| is hollow, and rotates on jack divisional advance of the cyclometer gear moves
shaft 52. Integral with countershaft 5| is the a contactor element to the next contact, hence in
?rst cyclometer gear Mb. The ?rst cyclometer , one revolution of an intermittent cyclometer gear
gear is a one tooth gear and at one point each all of the contacts will be connected in circuit
in sequence.
15 revolution meshes with pinion 53a, loose on aux
iliary shaft 54. Pinion 53b, integral with pinion
53a, meshes with the second cyclometer gear 55a,
which is a ten tooth gear. The third cyclometer
gear 555, integral with gear 55a, is a one tooth
20 gear, similar to 51b, and meshes with pinion 56a.
Pinion 65b, integral with pinion 55a, meshes with
the fourth cyclometer gear 51 which is a ten
tooth gear. Fig. 3, taken through line 3-3 of
Fig. 2, thus represents the odd numbered cyclom
Referring again to Fig. 1, the complete opera
tion of the timing mechanism is as follows: As
sume that the operator has inserted a sheet of
paper in the printer, and having completed the
preliminary calling procedure, is ready to type 20
the message proper. The operator then depresses
the timing key. This closes contacts [0 and en
ergizes release magnet 39 and clutch magnet 49.
Release magnet 39 pulls aside detent 36, releasing
eter gears, while Fig. 4 represents the even num
friction cam 33 which engages wheel 2| and is 25
of the revolution of the ?rst gear, and so on
mits a printing signal (by means of any desired
set in rotation thereby. Sequence cam 33b closes
bered cyclometer gears.
The design and operation of cyclometer trains and releases contacts 34, and thereafter, contacts
is well known, hence detailed description is not‘- 35. Contacts 34 close a circuit energizing one
required. It will su?lce for an understanding of of the key solenoids, the selection of which is
controlled by the “units” sequence switch.w As
30 the present invention to-state that in the transfer
from one cyclometer gear to the following one, an example, a circuit may be traced from nega
ive battery via contacts 34, via contactor 63 of
a reduction in speed of 10 to '1 is accomplished,
and that the rotation of the gears, except the ?rst the “units” switch, via contact 5, through key
gear, is intermittent. For example, the second solenoid l5, and return to positive battery. Key
gear is rotated one, tenth revolution each time solenoid I5 is energized, pulling down numeral
the single tooth of the first gear engages the
pinion, but remains at rest during the remainder mechanism and closes key switch 5’ which trans
through the train.
The cyclometer train ‘may be designed to en
able the recording of minutes and tenth minutes,
or minutes and tens of minutes, or any other de
sired units of time, such matters being well un
derstood by those versed in the art. By way of
explaining the present invention, and as an ex
ample, it will be assumed that the time groups
to be printed are to represent minutes and tenths
of minutes. In this case, the ?rst cyclometer
gear should rotate once every tenth minute, or
at a speed of 10 R. P. M. Since the main drive
shaft rotates at 450 R. P. M. the worm gear
should have a ratio of 45 to l. The second and
third cyclometer gears will rotate at 1.0 R. P. M.
hence each tenth division will represent tenths
of a minute. The fourth cyclometer gear will
rotate at a speed of one-tenth R. P. M., hence
each tenth division will represent one minute.
Mounted on the right face of cyclometer gear
551), but insulated therefrom, as for example by
insulator disk 58, is the rotary contactor element
SI of the “tenths” decimal switch. This element
comprises a metal cup Bla, and a metal ?nger
Gib mounted thereon by suitable means, such as
small rivets. Exterior electrical connection is
made to cup 6la by brush 62 bearing on the rim
thereon. Brush 62 and all other parts in the
electrical circuit are preferably insulated from
the frame. Rotary contactor element 63 of the
“units” decimal switch, which is similar in con
70 struction to element BI, is mounted on the left
face of cyclometer gear 51, and connection is
made to it via brush 84 in the same manner as
The stationary contacts 66 of the decimal
75 switch, ten in number, are mounted in insulator
transmitting mechanism) to the receiving
printer, which printer also prints the number “5” 40
on the receiving copy, see Fig. 8.
When contacts 35 are closed a short time later,
a circuit through the “tenths" switch vis set up
which may be traced as follows: from negative
battery via contacts 35, via contactor 6i and 45
contact 2, through winding of key solenoid l2
and return to positive battery. Numeral key “2”
is thus depressed, actuating the printer mecha
nism to print numeral "2” and also transmitting
a printing signal to the receiving printer which 50
likewise prints numeral “2”. Thus both the
original and received copies of the message bear
the time group 52, translatable as 5.2 minutes.
Meanwhile, upon the energizing of clutch mag
net 49, positive clutch 40 is engaged, and the 55
cyclometer mechanism is started up, advancing
the decimal switches as previously described dur
ing the transmission of the message proper as
above explained, the transmission system may
make use of any desired apparatus and method, 60
such as the coded impulse or the synchronous
system, as the present invention is not restricted
to any particular transmission system.
At the end of the message, the operator again
depresses the timing key, and a second time group,
corresponding to the position of the cyclometer
at this time, is printed on the original and re
ceived copies of the message, according to the
method just described. Assume that this second
time group is 98; then subtracting the ?rst time
group 52, it is determined that the elapsed time
of transmission is 4.6 minutes, and the time
charge for service is thus established. As before,
clutch magnet 49 is energized at the same time as
the release magnet, but this time the positive 75
clutch is thrown out of engagement, as previously
described, stopping the cyclometer train.
Between messages, the cyclometer train is not
actuated, hence the ?rst time group of the next
succeeding message will be the same as the second
time group of the prior message. Thus the ac
cumulated time of a series of messages can be
obtained by subtracting the ?rst time group of
the series from the last time group, each in
10 dividual message showing its own time of trans
For simplicity in description, only two decimal
switch groups have been shown.
It will be clear,
however, that by adding another unit assembly to
15 the‘ cyclometer train, another decimal switch
group, and an another set of contacts to cooper
ate with the sequence cam, the range of the
mechanism can be extended to record tens, units,
and tenths of a minute, or by suitable change
in the worm gear ratio or motor speed, hundreds,
tens, and unit minutes.
It will also be apparent to those skilled in the
art that well known setting and set-back devices
may be added to the cyclometer train to cause
25 the time groups to represent clock time, or to
start each message from zero time. Such varia
tions, following the teaching of the present in
vention, can be introduced to meet the require
ments of particular applications. The general
30 method of using arbitrary time groups herein de
scribed for illustrative purposes has the merit of
relative simplicity, and is generally to be preferred
on that account.
Referring now to Fig. 8, one type of signal trans
35 mitting and receiving system is shown embodying
the time control system.
A transmitting dis
tributor 10 is provided at the sending station and
comprises, in general, a plurality of rotary
brushes 'Il, adapted to engage successively the in
40 dividual conducting segments '12. The brushes
are rotated by a motor (not shown) so that when
ever the individual circuits connected to the cor
responding segments are closed, a timed signal is
transmitted over the transmission medium shown
45 as line conductor connected to the common con
ducting ring 13. The individual key contacts 2',
5' etc. are included in the said individual circuits
which in turn are connected to a common source
of supply shown as battery ‘M. Therefore, it is
60 evident, whenever the timing key is depressed to.
effect energization of the key solenoids l2, l5, etc.,
the operation of the corresponding key bars
causes not only the time indications to be
recorded at the sending station, but simultane
55 ously causes corresponding timed signals to be
initiated and imparted to theTine. *
At the receiving station, typewriter mecha
nism is provided similar to that at the sending
station and shown generally to comprise the con
60 trolling keys ‘!5, the operations of which are con
trolled by the associated solencids l2a, I5a, etc.
The said solenoids are connected to a common
ground and individually'to the separate conduct
ing segments 16 of the receiving distributor TI.
65 The distributor is similar to the one provided at
the sending station and is adapted to be operated in synchronism therewith; that is, the
brushes 18 which are rotated by a motor (not
shown) and adapted to engage the conducting
70 segments 16 successively, are rotated in exactly
the same timed relationship as the brushes ‘ll of
the transmitting distributor, so that when a char
acter signal is initiated at the sending station,
for example, the numeral 2, the signal imparted
75 to the line is-effective to energize the circuit for
the “2” key at the receiving station. This oper
ation just described is well known in the‘art and
it is deemed not necessary to describe the signal
transmission system in further detail.
Referring now to Fig. 7, a particular type of 5
typewriter mechanism, such as the Electromatic,
is shown and which may be employed in the signal
transmission systems referred to hereinabove. In
the embodiment illustrated in the drawings, well
known means are provided for actuating the type
bars (not shown) by power operated devices com
prising a power driven roller 80. A cam 8| is
pivoted on one arm of a bell crank lever 82 pivoted
in the frame, the other arm of which is operatively
connected with one arm of a bell crank lever 83 by 15
means of link 84. The other arm of lever 83 is
connected to the type bars in a well known man
The lever 82 is actuated by the cam 8| when the
latter engages the driven roller 80 to be operated 20
thereby. The engagement of the cam 8| with the
power roller is controlled by means of the key
lever 85 in a manner now to be described.
The cam BI is resiliently engaged by a spring
pressed arm 86 which tends to turn it into en 25
gagement with the power driven roller or stop 81
on a lever 88 pivoted on the bell crank 82 and
normally arranged in the path of a lug on the
cam. When the lever 88 swings to move its stop
out of the path of the lug on the cam, the arm 86 30
swings the cam into engagement with the power
roller to be actuated thereby to swing the bell
crank 82 to actuate its connected mechanism.
The lever 82 has an arm 89 which is provided with
an offset projection 98 at its end which projects
laterally through an opening in the bell crank 82
and engages the bifurcated lower end 9| of a key
lever 85 pivoted on the common rod 92.
It is obvious then that depression of "a key lever
85 releases the revolubly mounted cam 8| to en 40
gage and be actuated by power roller 80 in turn
operating bell crank lever 82 and its attached
links to cause the associated mechanism, such as
the key bars and other operating mechanisms.
Attached to the key lever 85 is shown the solenoid
l2 disposed beneath the keyboard so that upon
energization of the said solenoid the connected
key lever is depressed to operate the connected
instrumentality in the manner just explained.
While there has been shown and described and
pointed out the fundamental novel features of the 50
invention as applied to a single modi?cation, it
will be understood that various omissions and sub- ‘
stltutions and changes in the form and details of
the device illustrated and in its operation may be
made by those skilled in the art without departing
from the spirit of the invention. It is the in
tention therefore to be limited only as indicated
by the scope of the following claims.
What is claimed is as follows:
1. A system of the character described compris
ing, in combination, a sending and receiving sta
tion, each of which is provided with typewriting
mechanism having printing instrumentalities and
control keys therefor, a selectively settable tim
ing mechanism at the sending station, means to
control the operation of the control keys of the
sending typewriter to print a time indication cor
responding to the setting of the timing mecha
nism, means controlled by the keys of the sending 70
typewriter upon operation thereof to transmit
control signals, and means responsive to the sig
nals to control the keys of the receiving typewriter
to record the time indications corresponding to
those recorded at the sending station.
means responsive to the signals .to control the re
cording instrumentalities in accordance with the
signals, selectively settable timing mechanism,
and means to control the operation of the con
‘ trol instrumentalities in accordance with the set
ting of the timing mechanism to transmit signals
in accordance therewith and thereby control the
operation of the said recording instrumentalities
3. A system of the character described com
prising, in combination, sending typewriting
mechanism having printing instrumentalities and
control keys therefor, means controlled by said
keys to transmit control signals in accordance
with the operated keys, receiving typewriting
20 mechanism having printing instrumentalities and
operated to effect recording at the sending and
receiving mechanisms of the time indications in
accordance with the altered setting of the timing _
mechanism and also to render inoperative the
said operating means to prevent further setting of
the timing mechanism.
6. A system of ‘the character described com
prising, in combination, a sending station and a
receiving station, each provided with recording
instrumentalities and control means therefor, 10
means controlled by the said control means at the
‘sending station to control the operation of the
corresponding said control means at the receiving
.station, selectively settable timing mechanism,
and means to control the operation of the control 15
means at the sending station to effect recording of
the time indications in accordance with the set
control means therefor, means responsive to the
said signals to control the operation of said con
ting of the timing mechanism at both of said
7. A system of the character described compris
ing, in combination, sending and receiving type
writing mechanisms, each having recording in
trol means, selectively settable timing mechanism,
strumentalities and a control means therefor,
and means to control the operation of the said
means controlled by the sending control means to
control the operation of the corresponding receiv 25
ing control means, selectively settable timing
mechanism, a timing control key associated with
25 control keys in accordance with the setting of the
timing mechanism to record the time indications
and to transmit representing signals in accord
ance with the recorded indications thereby con
trolling the receiving typewriting mechanism
2. A system’ of the character described com
prising, in combination, means including control
instrumentalities to transmit character signals,
remotely situated recording instrumentalities and
4. A system of the character described compris
ing, in combination, sending typewriting mecha
nism having printing instrumentalities and con
trol keys therefor, means controlled by said keys
35 to transmit control signals in accordance with the
operated keys, receiving typewriting mechanism
having, printing instrumentalities and control
means therefor, means responsive to the said sig
nals to control the operation of said control
'the said sending mechanism, and means con
trolled by said key to control the operation of the
sending control means to' effect‘ recording of the 30
time indications in accordance with the setting of
the timing mechanism on both the sending and
receiving mechanism.
8. A system of the character described com
prising, in combination, sending and receiving 35
printer mechanisms, each having recording in
strumentalitiesand control means therefor,means
controlled by the sending control means to control
the operation of the corresponding receiving con
means, selectively settable timing mechanism,
trol means,'selectively settable timing mechanism
and means to control the operation of the said
control keys in accordance with the setting of the
timing mechanism to record the time indications
key associated with the said sending mechanism,
and to transmit simultaneously representing sig
45 nals in accordance with the recorded indications
thereby controlling the receiving typewriting
mechanism accordingly.
5. A system of the character described compris
ing, in combination, sending and receiving type~
50 writing mechanisms each having control means
therefor, means controlled by the sending control
means upon operation thereof to initiate control
signals to control the operation of the receiving
control means to operate the receiving typewrit
55 ing mechanism accordingly, selectively settable
and operating means therefor, a timing control
and means controlled by said key to control the
operation of‘ the sending control means to effect
recording of the time indications in accordance 4.5
‘with the setting of the timing mechanism on the
sending and receiving printer mechanisms and
simultaneously to render operative the said oper
ating means to alter the setting of the timing
9. A system of the character described compris
ing, in combination, recording instrumentalities
and control means therefor, means controlled by
the said control means to initiate corresponding
control signals, selectively settable timing mecha 55
timing mechanism and operating means therefor,
and additional means, upon operation thereof, to
control the operation of the sending control means
nism and operating means therefor, and addi
tional means, the successive operation of which
renders the operating means for the timing
in accordance with the setting of the timing
mechanism operative and inoperative respectively
and also controls the operation of the recording
mechanism and simultaneously to render the op
erating means operative to alter the setting of the
timing mechanism, operation of the said sending
control means is effective to record the time indi
cations at the sending mechanism and receiving
mechanism, and upon a second operation of said
additional means the sending control means are
instrumentalities control means in accordance
with the setting of the timing mechanism at the
times of operation of the said additional means,
thereby recording the corresponding time indica
tions and initiating corresponding control signals.
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