close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2405568

код для вставки
Aug. 13, 1946.
T. M. FERRILL. JR
2,405,568
INDICATING APPARATUS
Filed April 29, 1944
2 Sheets-Sheet 1
BY
RNEY
Patented Aug. 13, _1946
2,405,568
UNITED STATES PATENT OFFICE
2,405,568
INDICATING APPARATUS
Thomas M. Ferrill, Jr., Hempstead, N. Y., assign
or to Sperry Gyroscope Company, Inc., a corpo
ration of New York
Application April 29, 1944, Serial No. 533,434
17 claims. ` (01.177-337)
2
1
This invention relates to synchronous trans
‘ the balance in amplifiers so they will accurately
operate the receiver motor synchronously with
mission systems, and particularly concerns meas
urement and compensation of errors occurring
the transmitter without introducing errors dur
ing fluctuations in power supply, temperature
changes, etc. As a result, such ampliñers become
disproportionately elaborate and expensive ex
cept in specific installations where they are used
to operate a large number of repeater motors.
An important object of the invention is to pro
vide an improved transmission system including
a transmitter and a receiver, wherein discrepan
cies in the reproduction of transmitted signals
in synchronous telemetric data transmission
systems.
In synchronous systems of this type a syn
chronous positional transmitter is usually posi
tioned according to the data desired to be trans
mitted.
A synchronous repeater motor is elec
trically connected to the transmitter and has a
member positionable synchronously with the po
sition of the transmitter to indicate the trans
mitted data. When the repeater motor is directly
connected to the transmitter, certain errors are
are continuously measured.
Another important object of the invention is -
introduced due to the torque required to over
to provide an improved data transmission system
come friction in the receiver motor and also due
to the coercive eiîect of a reactive torque devel
in which received indications are continuously
compensated for errors introduced within the
system so as to continuously indicate correct
information.
oped within the transmitter on the instrument
from 'which data is being transmitted.
Since the torque produced by the receiver 20
motor depends upon the magnitude of positional
disagreement between the transmitter and the
Another object of the invention is to provide
improved indicating apparatus particularly use
receiver it is sometimes necessary to have appre
ful for data transmission system in which errors
may be introduced or inherently exist, and
ciable positional disagreement before suñicient
wherein the errors are automatically compen
torque is developed to overcome friction in the 25 sated to correctly indicate the transmitted data.
A further object of the invention is to provide
receiver and the indicator operated by the re
a new and improved indicator in which informa
ceiver motor. In such a case, the positional dis
tion is continuously indicated by the po-sition of
agreement necessary to develop suñicient torque
for overcoming the friction of the receiver motor
and indicator, results in an error between the
transmitted and indicated data.
These errors may be reduced by inserting va
power amplifier in the electrical circuit between
the transmitter and the receiver for amplifying
voltages produced by the transmitter windings f1 Ll
and applying the voltages thus ampliñed to the
windings of the receiver motor. The power increase provided in this manner reduces the posi
tional displacement necessary to overcome fric
tion in the receiver motor because less displace
ment is required to develop the necessary torque.
Since the transmitter is isolated from the re
ceiver by the amplifier, there is very little load
on the transmitter, hence reactive torque is prac
`
a magnified scale and is continuously corrected
by a movable index that is accurately positioned
relative to the magnified scale to compensate for
errors in the position of the scale.
A still further object of the invention is to
provide a simple, efficient, and economical trans
mission system wherein the accuracy obtained is
comparable to that heretofore possible only in
expensive and more complicated systems.
Other objects and advantages of the invention,
particularly with regard to arrangements of parts
tically eliminated.
for convenience and other special advantages
will become apparent in connection with the
following description and accompanying draw
ings illustrating a preferred embodiment of the
invention.
In thel drawings,
Although the insertion of an ampliñer in the
transmission system between the transmitter
transmission system embodying the invention
Fig. l. is a schematic wiring diagram of a data
and the receiver motor may reduce errors due
for measuring errors between transmitted and
to friction in the receiver and reactive torque
received data;
in the transmitter, any imbalance that may exist f
struct ampliñers which have accurately balanced
Fig. 2 is a vertical section of an indicator con
structed according to the invention for use in a
system as shown in Fig. l, and having an adjust
able index for correcting or compensating the
indicated data for errors occurring in the trans
channels. It is even more diflicult to maintain, ‘
mission system; and
or develop in the ampliñer circuit will cause
other errors between the transmitted and indi
cated data. It is difficult to design and con
2,405,568
3
Fig. 3 is a front elevation of the indicator
shown in Fig. 2.
For purposes of illustration the invention is
incorporated in a data transmission system in
cluding a transmitter and receiver which may
be of the well-known “Selsyn,” “Telegon” or
“Autosyn” types having multiple windings inter
connected to produce a rotatably positionable
iield upon excitation oi an exciting winding in
compensation is made by the positioning of the
movable index for errors in the transmission sys
tern, as evidenced by positional disagreement be
tween the transmitter and the receiver.
For a more specific description of the preferred
embodiment of the invention, attention is ñrst
directed to Fig. l which shows a data repeater
system including apparatus for measuring and
providing indications of errors introduced in the
data transmitted by the system. A directional
instrument indicated schematically by a rec
exciting winding in the receiver to a harmonical
tangle ll, such as a compass, is connected as by
ly related source of energy the receiver motor is
shaft I2 to position roto-r I3 of data transmitter
operated synchronously with the transmitter in a
id which may be of the “Selsyim” “Telegon” or
'well-known manner to position the data indi
“Autosyn” type. The rotor i3 carries an excit
cator in accordance with data supplied to the
ing winding i5 connected to an appropriate
transmitter.
source l@ of alternating voltage. The stator of
As already explained, friction losses and the
the data transmitter Ill has a multiple winding
coercive eiîect of the receiver load on the trans
il shown as including three legs i8, lil and 2i,
mitter introduce errors in the indicated data.
Preferably these errors are reduced by using the 2.0 which are connected as by leads 23, 24 and 25 to
alternative system including an ampliñer having
a terminal plug 2l of a receiver and indicator 23.
separate channels for amplifying voltages of the
Leads 23 and 2e connect the source lâ to the
input plug 2l for operating ampliiiers forming a
multiple windings of the transmitter and apply
ing these ampliiied voltages to corresponding
part of the receiver indicator 28 as will subse
quently appear.
windings of the receiver. As already stated this
arrangement is not entirely satisfactory unless
As the position of shaft l2 is adjusted by the
expensive, especially stabilized ampliñers are
directional instrument l E, the iiux linkages be
tween rotor winding I5 and the individual legs
used.
of multiple winding il' are varied so voltages in
According to the present invention, any errors
occurring in the system between the transmitted 30 duced in the separate legs of the multiple wind
ing Il! are varied in magnitude and phase. A
and received data are measured. To measure the
the transmitter. By connecting a corresponding
positional disagreement between the transmitter
balanced ampliñer circuit including double triode
and receiver motor, a signal generator, of the
29, ampliñes the voltages between the three legs
same general construction as the transmitter and
ld, i9 and 2i of the multiple winding Il and also
the receiver, but which may be constructed on a 35 _by amplifying the voltages between lead 23 con
smaller scale, is mechanically and electrically
nected to winding i8 and leads 24 and 25 con
coupled into the system. This signal generator
nected to windings lil and 2l, respectively. In
includes ñeld and pick-up windings arranged for
this manner, the difference between the two am
pliiied voltages will be an amplification of the
relative rotation. Preferably, relative rotation of
these windings is eñected by the receiver motor 40 voltage between leads 24 and 25 connected to
legs I9 and 2 l, respectively.
according to the indicated data, and the multiple
winding is connected in the transmission system
The double triode 29 has its anodes 3i and S2
directly to the transmitter.
supplied with suitable unidirectional voltage from
The ñeld windings and the voltage output
the series circuit including rectiñer 33 and ñlter
winding of the signal generator unit are coupled
Sil connected across leads (i5 and
which are in
to the rotor and stator of the receiver motor in
turn connected through the plug 2l to the alter
such a relation that when the receiver rotor is in
nating voltage source i5. Cathodes Si and Si! oi
exact angular positional agreement with the
the
in the
tube
iilter
29 are and
connected
grids »ilto and
voltage
¿53 ofdivider
the tube
transmitter rotor, the output of the signal gen
50 2e are similarly connected through grid resistors
erator unit is zero.
With this arrangement a reversible phase vari
¿is and @d to voltage divider Se for applying an
able magnitude alternating voltage is induced in
appropriate bias to the grids. Since the cathodee
the pick-up winding of the signal generator in
are coupled to lead
corresponding to lead 23
phase relation dependent upon the positional dis
from the winding it, and winding lil is connect
agreement between the transmitter and receiver.
ed by leads 24 and Q5 through coupling condenser
This alternating voltage is converted as by a bal
to the grid di, the voltage across load resistor
anced demodulator into a reversible polarity,
fill in the circuit of plate 3l varies according to
Variable magnitude unidirectional voltage that is
an amplification of the voltages between windings
applied to a suitable meter which may have a
@i3 and i9.
d’Arsonval type movement. In this manner a
This amplified voltage corresponding to the
pointer on the meter is deflected in one direction
voltage between windings i8 and i9 is applied
or another, dependent upon the polarity or the
through coupling condenser ¿le across corre
unidirectional voltage, and is deflected through
sponding legs 5i and 52 of the multiple winding
an angle dependent upon the magnitude of said
5S for receiver or repeater motor lid. Similarly
voltage. The deilection of this pointer thus pro
the voltage between windings i3 and 2l is ap
vides a measure of the direction and magnitude
plied between grid @2 and cathode 353 by lead 56
of the positional disagreement between the
and coupling condenser 5l so a correspondingly
transmitter and the receiver.
In order to compensate for errors in a data
amplified voltage appears across load resistor
transmission system the pointer may be used as
a movable index for the indicated data whereby
an appropriate correction will be made auto
matically. The relative positions of the data in
dicator and the movable index will provide an
5S in the circuit of plate
and is applied through
coupling condenser 5S to winding ai of the mul
du.
tiple winding W’
Thus, the voltage between
accurate indication of the transmitted data, since
and the voltage between windings E2 and 5i cor
windings 5i and @l corresponds to an amplirlca- '
tion of the voltage between windings it and 2i,
2,405,568
5
6
respond to an ampliiication of the voltage be
tween windings I9 and 2 I.
As is well known in transmission systems of
this type, the relative magnitude and phase re
lation of the voltage applied to the legs of the
and 92 to the opposite side of the pick-up wind
ing 8I. With this arrangement the alternating
voltage from the pick-up winding is applied in
like phase between the grids and cathodes of the
opposite sides of the double triode 85. Plate-s 93
repeater multiple winding produce currents in
the respective windings which produce a result
ant magnetic ñeld in a direction dependant upon
and 94 of the double triode are energized in
phase opposition by an alternating volt-age from
the source I6 by leads 35 and 35, which are con
nected across resistors 95 and 8G. To complete
the position of transmitter rotor winding I5.
the anode-cathode circuit, the center point of
10
The receiver motor 54 includes an exciting
resistor 25 and 8o is connected by a lead 97 to the
winding 63 carried by rotor B4 having a »shaft 65
center point of cathode resistors SI and 92.
AS is well-known, in a balanced demodulator
able data indicator, By connecting the exciting
circuit of this type one side or the other of the
winding 63 through leads 35 and 35 to the source
dual triodes will conduct more anode-cathode
I5, a torque is developed between the exciting
current per cycle than the other and a unidirec
winding 53 and the resultant field of multiple
tional voltage will appear across one of the cath
winding 53 that tends to relatively position the
ode resistors SI and 92, depending upon the side
rotor 64 and stator winding 53 ysynchronously
of the double triode having an anode at positive
with the relative positions of the rotor and stator
20 potential relative to the associated cathode dur
in the transmitter I4.
ing the most positive excursion of the grids 83
Assuming that no errors are introduced in the
and 81. Thus, a differential unidirectional volt
transmission system the position of shaft 65 and
age appears across the series circuit of the cath
the data indicated thereby will be the same as
ode resistors QI and 92 which is of a polarity and
that transmitted from a datum member such as
a magnitude dependent upon the phase and am
the directional instrument II. However, as pre
plitude
of the voltage from pick-up winding BI.
viously explained, errors may be introduced due
This diiierential unidirectional voltage is applied
to unbalanced conditions in the amplifier and
coupled to a gear 55 which may operate a suit
other causes which result in a „positional dis
agreement between the rotor I3 and the rotor 65s
as by leads 98 and 99 to a suitable voltmeter IUI
which may have a conventional d’Arsonval move
causing an error to appear in the data indicated. 30 ment. Indicator pointer |83 of the meter IDI is
deñected in one direction or another from its
In order to measure this error, a signal gen
neutral
position according to the polarity and
erator` 'II which may be in the form of a small
“Selsyn,” “Telegon” or “Autosym” has individ
ual legs 12, 'I3 and ‘I4 of multiple winding "i5
connected as by leads 16, 'I‘I and -I8 to correspond
ing windings I8, I8 and 2l of the transmitter I4.
With this arrangement the relative magnitudes
of the voltages induced in the separate windings
oi' the transmitter’s multiple winding i? cause
the multiple iield winding 'I5 of the signal gen 40
erator 'II to produce a resultant field having a
direction determined by the relative magnitudes
and phases of the currents iiowing through the
individual windings. Since the direction of this
resultant field depends upon the position of rotor
I3 it has a predetermined relation to the trans
mitted data. Pick-up winding 8I on rotor 82 is
coupled as by shaft 83 te the rotor E4 of the re
peater 54 to be positioned for adjusting the in
ductive coupling between the pick-up winding 8i
and the iield winding 'I5 according to the indicat
ed data. Rotor 82 is s-o oriented relative to rotor
64 that when rotor ‘64 is in exact positional agree
ment with rotor I3, no output voltage is produced
across rotor winding 8|.
Since the multiple winding 'I5 of the signal
generator -II produces a resultant field having a
direction dependent upon transmitted data and
the relative positions of the rotor and stator
winding depend-s upon the indicated or received
data, asynchronous characteristics of the trans
mission system induce a voltage in the pick-up
winding 8I having a phase and amplitude corre
spending to the direction and magnitude ci any
positional disagreement between the position oi
the transmitter rotor I3 and the receiver rotor`
B4. Therefore this voltage is a measure of any
error between transmitted and received data.
This alternating voltage is converted into a re
versible polarity variable magnitude unidirec- '
tional voltage by a balanced demodulator circuit
including a double triode 85 having its grids 38
and 8l directly connected to one side of the pick
up winding 8I, and its cathodes 88 and 89 con
nected through individual cathode resistors SI
magnitude of the unidirectional voltage applied
thereto.
In this manner the direction and mag
nitude of the deflection of pointer |83 corresponds
to the direction and magnitude of the positional
disagreement between the transmitter rotor I3
and the receiver rotor £4 to indicate the error
between transmitted and received data.
The apparatus thus far described provides a
measure and indication of the positional disagree
ment between the transmitter and receiver cor
responding to the error between transmitted and
received data. According to an important fea
ture of the invention, received data may be auto
matically corrected or compensated to eliminate
erroneous indications by, for example, using the
pointer Iû3 as a movable reference device for the
indicator positioned by gear at forming the out
put of the receiver. Since errors in the neigh
borhood of ñve or ten degrees between the posi
tions of the transmitter and repeater rotors may
deflect the pointer ID3 over a larger scale, for
example thirty to forty-five degrees, it is desir
able when using the pointer I83 as a movable
reference to provide the indicated data on a mag
niñed scale.
For this purpose, >the repeater-indicator illus
trated in Figs. 2 and 3 may be used.
This re
peater-indicator includes an angular motion in
dicator similar to that described in U. S. Patent
No. 2,098,580, issued on November 9, 1937, to W.
G. Harding. As shown most clearly in Fig, 2,
the repeater motor 54 is connected by a coupling
ISE to the signal generator II, the rotor of the
repeater motor being aiso mechanically coupled
to the motor of the signal generator 1I as here
tofore explained. The amplifier tube
together
with its rectiñer 33 and the demodulator tube 85,
are mounted on a suitable chassis |88, inclosing
the various circuit elements described in connec
tion with unit 28 of Fig. 1. The output of the
demodulator is connected as by leads 98 and 99
to the d’Arsonval movement Iûl for positioning
needle ID3.
2,405,568
7
The repeater motor E4 operates through the
gear 56 which drives through gearing l l l and l l 2
ence device for the indicator dial l l5, so the rela
tive positions of the dial and the reference pointer
at all times provide an accurate indication of the
to rotate a gear Hä supported for rotation in
transmitted data. The actual error between
bearing l M and carrying an indicating card or
dial H5. The gearing and the speed of the re CT( transmitted and received data is indicated by the
position of the pointer m3 relative to a scale M5
peater motor 55.1 are so proportioned that the dial
on the stationary portion of the face of the in
lie is caused to move through an angular dis
strument.
tance equal to a multiple of the distance through
By virtue or" this arrangement, the dial is con
which the compass or other directional instru
ment H apparentiy turns. In the embodiment 10 tinuously positioned by the repeater motor 5d to
provide a magnified indication of received data.
shown, the dial H5 turns through ñve times the
Errors between transmitted and received data are
angular movement of the master compass. Thus,
measured by the output of the signal generator
if the master compass card moves through an
'li and indicated by the position of pointer IUS.
angle of 60° the indicating dial i i5 of the repeater
Since the pointer MBS represents a movable index
will move through an angle of 300C’. A disc il?
for the dial iid, any error in the received data is
carries a mask card lie immediately in front of
corrected by the position of the pointer, so the
the dial itâ. rl‘he disc lll is provided with gear
relative positions of the pointer itâ and the dial
te-eth H9, which mesh with teeth itl forming
its at ali times represent transmitted data from
an internal ring gear attached to the dial H5.
the directional instrument H.
The disc iii is supported on a hollow shaft M3
What is claimed is:
that is mounted in bearings 92d and §25 arranged
eccentrically with respect to the bearing lill to
permit relative movement of the mask M3 and
dial H5.
It will be understood that with this
1. A control system comprising in combination,
a transmitter coupled with a control member, a
synchronous repeater motor coupled with a con
25 trolled member, said transmitter and motor hav
multiple windings interconnected to form a
portional rotation of mask l i8 at a slightly higher
synchronous transmission system for synchro
speed and in the same direction, due to their
nously positioning said members, and signal gen
geared relationship since the inner gear formed
erator means mechanically driven by said re
by teeth lie has less teeth than the ring gear
on the dial its. The edge of the indicating dial 30 heater motor and electrically connected to said
transmission system and responsive to asynchro
iid is, as shown in Fig. 3, divided by markings,
nous characteristics thereof for developing a sig
into @quai divisions numbered in a special mannal dependent upon positional disagreement oi’
ner. rl‘he mask llt? is formed with notches or
said members.
apertures
liîiì, cut in its edge, of such size
as, when the mask dit is placed above dial M5, 35 2. A control system comprising in combination,
arrangement rotation of dial l i 5 will cause a pro
to enable certain ñgures on the card to be seen,
a transmitter coupled with a control member, a
as clearly shown in Fig. 3. As the card and mask
rotate at different rates the apertures will pass
slowly from one iigure to another, but owing to
the eccentric mounting of the card and mask the 40
synchronous repeater motor coupled with a con
trolled member, said transmitter and motor hav
ing multiple windings interconnected to form a
sync .ronous transmission system for synchro
numbers en the cards and the spaces on the mask
will travel substantially together for an arc of
about one-third of a circle, at the top of the re
peater as shown in Fig. 3. Over the remaining
two-thirds of the circle the numbers will be dis
placed more or less from the gaps in the mask,
and to avoid confusion the lower portion of the
card and mask are screened as shown in the
drawings. i he repeater-indicator is provided
with the usual glass cover-plate 112s (Fig. 2) .
As more fully described in the aforementioned
patent, the dial l i5 revolves at ive times the rate
of the shaft from repeater motor` 5ft, which, of
course, is synchronous with the transmitter shaft
l2. Therefore, the scale of the indicated data
as represented by the indications on the dial §55
is greatly magniñed to enable more accurate ob
servations oi small changes in received data.
In order to correct these magnified indications
for errors between the transmitted and received
data, the pointer itt is supported on a shaft lill
supported within the hollow shaft i223 as by a
fiber bushing M2 to be positioned by rotating
element ifi?, of the d’Arsonval movement lili.
The movement of the pointer itâ» is calibrated
by adjusting the gain of the demodulator tube
35 to deflect the pointer according to the mask
ings on the dial H5 for corresponding errors in
the positional disagreement of the transmitter
and receiver. For example, a positional disagree
ment ci two degrees between the transmitter and
repeater rotors would deflect the pointer idd
through an angle of ten degrees subtended by
two indications on the dial l l5. ln this manner,
the pointer H53 operates as an adjustable refer
nously positioning said members, and a signal
generator including a íield winding and a pick-up
winding having their inductive coupling adjust
ably arranged with movement of one of said mem
bers, said iield winding being connected in circuit
with said multiple windings for inducing a signal
in said pick-up winding corresponding to posi
tional disagreement of said members.
3. A control system comprising in combination,
a transmitter coupled with a control member, a
synchronous repeater motor coupled with a con
trolled member, said transmitter and motor each
having multiple windings interconnected to form
a synchronous transmission system for synchro
nously positioning said members, a signal gen
erator including a field winding and a pick-up
winding having their inductive coupling adjust
able by movement of said controlled member, said
ñeld winding being connected in circuit with said
multiple windings for inducing a Voltage in said
pick-up winding corresponding to the positional
disagreement between said members, and an error
indicator connected to said pick-up winding to be
deflected by the voltage induced therein accord
ing to said positional disagreement.
4. A data transmission system comprising a
positionable datum member, a, transmitter cou
pled with said datum member, a synchronous re
peater motor, an indicator member positioned by
said motor, said transmitter and repeater motor
being connected in a synchronous system for
positioning said indicator member synchronously
with said datum member, a movable reierence
device for said indicator member, and means re
sponsive to asynchronous characteristics of said
2,405,568
v10
synchronous system for positioning said reference
data represented by said signals and the position
device relative to said indicator according to posi
tional disagreement between said members for
providing continuously accurate data indications.
5. A data transmission system comprising a
positional datum member, a transmitter cou
pled with said datum member, a synchronous re
of said motor for positioning said reference de
vice relative to said indicator according to errors
in said indicated data to continuously provide ac
curate data indications.
9. In a synchronous transmission system, ap
paratus for indicating transmitted positional data
comprising a synchronous repeater motor, a mov
peater motor, an indicator member positioned by
said repeater motor, said transmitter and said re
able positional data indicator positioned by said
peater motoi‘ being connected in a synchronous Il) motor, electrical coupling means for operating
said motor by positional data signals from a
system for positioning said indicating member
transmitter 'to position said indicator substan
synchronously with said datum member, a mov
tially in agreement with said signals, and a signal
able reference device for said indicator member,
generator including a ñeld winding and a pick
a signal generator including a iield winding and
a pick-up winding having their inductive coupling
adjustable by rotation of said indicator member,
said iield winding being connected in circuit with
up winding Ahaving their inductive coupling ad
justable by rotation of said motor, said íield wind
ing being connected to said electrical coupling
means for inducing signals in said pick-up wind
ing corresponding to the difference between the
disagreement between said members, and means 20 positional data represented by said signals and
said synchronous system to induce a voltage in
said pick-up winding corresponding to positional
` connected to said pick-up winding for operating
seid reference device according to said disagree
ment to provide continuously accurate data in
dications.
the position of said motor.
l0. In a synchronous transmission system, ap
paratus for indicating transmitted positional data
comprising a synchronous repeater motor, a mov
5. A data transmission system comprising a 25 able positional data indicator positioned by said
positionable datum member, a transmitter cou
motor, electrical coupling means for operating
said motor by positional data signals from a
pled with said datum member, a synchronous re
peater motor coupled with an indicator dial hav
transmitter to position said indicator substan
tially in agreement with said signals, an error in
ing indications thereon, said transmitter and
motor being connected in a synchronous system
dicator, a signal generator including neld Wind
for positioning said indicator dial synchronously
with said datum member, a mask adjacent said
dial, means for differentially revolving said dial
and said mask to expose said indications in their
correct sequence, a movable reference device posi
tionable over a segmental portion of said dial to
correct the data indicated thereby, and means
responsive to asynchronous characteristics of said
ing and a pick-up Winding having their inductive
coupling adjustable by rotation of said motor,
said iield winding being connected to said elec
trical coupling means ior inducing a voltage in
said pick-up winding corresponding tothe dif
ference between the positional data represented
by said signals and the position or" said motor, and
means connected to said pick-up winding for op
erating said error indicator according to said dif
synchronous system for positioning said reference
device according to the positional disagreement 4.0 terence.
between said datum member and said dial for
il. In a synchronous transmission system, ap
continuously providing accurate data indications.
paratus for indicating transmitted positional data
comprising a synchronous repeater motor, a mov
7. A data transmission system comprising a
able positional data indicator positioned by said
positionable datum member, a transmitter cou
pled With said datum member, a synchronous re- .
moto-r, electrical coupling means for operating.
said motor by positional data signals from a
eater motor coupled with an indicator, said
transmitter and repeater motor being connected
transmitter to position said indicator substan
in a synchronous system including an ampliiier
tially in agreement with said signals, a movable
for supplying signals from said transmitter to
reference device for said indicator member, a
said motor for positioning said indicator member 50 signal generator including a neld winding and a
pick-up winding having their inductive coupling
synchronously with said datum member, a mov
adjustable by rotation of said motor, said iield
able reierence device for said indicator member,
a signal generator including a ñeld winding and
winding being connected to said electrical cou
a pick-up winding having their inductive cou
pling means for inducing signals in said pick-up
pling adjustable by rotation of said indicator 55 Winding corresponding to the diiîerence between
member, said ñeld winding being connected to
said transmitter in a manner to induce a voltage
in said pick-up winding corresponding to posi
tional disagreement between said members, and
means connected to said pick-up winding for po
sitioning said movable reference device accord
ing to said positional disagreement to continu
ously provide accurate data indications.
8. In a synchronous transmission system, ap
the positional data represented by said signals
and the position of said motor, and means con
nected to said pick-up winding for positioning
said reference device relative to said indicator
60 member according to said difference to continu
ously provide accurate data indications.
12. In a synchronous transmission System, ap..
paratus for indicating transmitted positional data
comprising a synchronous repeater motor, a mov~
paratus for indicating transmitted positional data 65 able po-sitional data indicator positioned by said
comprising a synchronous repeater motor, a mov
able positional data indicator positioned by' said
motor, electrical coupling means for operating
motor, electrical coupling means including an am
pliiier for amplifying positional data signals from
a transmitter to operate said motor to position
said indicator according to said signals, and
means mechanically coupled to said motor and
electrically connected in circuit with said elec
trical coupling means for producing signals cor
responding to error in the positioning of said in
said motor by positional data signals from a
transmitter to position said indicator substan
tially in agreement with said signals, a movable
reference device for said indicator member, and
means coupled to said motor and connected in
circuit with said electrical coupling means re
dicator relative to said signals.
sponsive to the difference between the positional 76
13. In a synchronous transmission system, ap
lll
paratus for indicating transmitted positional data
comprising a synchronous repeater motor, a mov
able positional data indicator positioned by said
motor, electrical coupling means including an am
plifier for amplifying positional data signals from
a transmitter to operate said motor to position
said indicator substantially in agreement with
said signals, and a signal generator including a
iield Winding and a pick-up Winding having their
inductive coupling adjustable by rotation of said
adjustably positionable over a segmental portion
of said dial, and means coupled to said motor and
connected in circuit with said electrical coupling
means responsive to the diiïerence between the
positional data represented by said signals and
the position of said motor for deñecting said ref
erence device relative to said dial according to
said difference to continuously provide accurate
data indications.
16. In a synchronous data transmission system,
motor, said ñeld winding being connected in cir
apparatus for indicating transmitted positional
cuit with said electrical coupling means for in
data comprising a synchronous repeater motor,
an indicator dial having indications thereon, a
ducing signals in said pick-up Winding corre
sponding to the difference between positional data
represented by said signals and the position of
said motor.
14. In a synchronous transmission system, ap
paratus for indicating transmitted positional data
comprising a synchronous repeater motor, a mov
able positional data indicator positioned by said i
motor, electrical coupling means including an am
pliñer for amplifying positional data signals from
a transmitter to operate said motor to position
said indicator substantially in agreement with
the amplined positional data signals, a movable
reference device for said indicator member, a sig
nal generator including a field winding and a
mask adjacent said dial having apertures therein,
means operative by said motor for differentially
revolving both said dial and said mask to expose
said indications in a correct sequence, electrical
coupling means for operating said motor by posi
tional data signals from a transmitter to position
said dial and said mask substantially in agree
ment with said signals, reference device adjust
ably positionable over a segmental portion of said
dial, a signal generator including a íield Winding
and a pick-up winding having their inductive
coupling adjustable by rotation of said motor, said
iield Winding being connected in circuit with said
electrical coupling means for >inducing signals in
Winding being connected in circuit With said elec- ,
said pick-up Winding corresponding to the differ
ence between the positional data represented by
said signals and the position of said motor, and
trical coupling means for inducing signals in said
means actuated by said pick-up winding for po
pick-up winding having their inductive coupling
adjustable by rotation of said motor, said ñeld
sitioning said reference device relative to said dial
pick-up Winding corresponding to the difference
according to said difference to continuously pro
between the positional data represented by said
vide accurate data indications.
signals and the position of said motor, and means
17. Apparatus for synchronously indicating pc
actuated by said pick-up winding for positioning 35
sitional data from a synchronous electrical posi
said reference device relative to said indicator
tional transmitter, comprising a synchronous po
member according to said difference to co-ntinu
siticnal repeater motor having a movable posi
ously provide accurate data indications.
tional indicator, means for electrically coupling
15. In a synchronous data transmission system,
said motor to said transmitter to provide move
ment of said indicator substantially in agreement
with signals produced by movement or said trans
an indicator dial having indications thereon, a
mitter, signal generator means mechanically
mask adjacent said dial having apertures there
driven by said repeater motor and electrically
in, means operative by said motor for diiieren
tially revolving both said dial and said mask to 45 connected to said electrical coupling means for
producing a signal responsive to positional olis
eXpose said indications in a correct sequence, elec
agreement of said repeater and said transmitter,
trical coupling means for operating said motor by
and means responsive to said signal for indicating
positional data signals from a transmitter to po
said positional disagreement.
sition said dial and said mask substantially in
THOMAS M, FERRILL, Ja.
agreement With said signals, a reference device 50
apparatus for indicating transmitted positional
data comprising a synchronous repeater motor,
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 175 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа