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Патент USA US2108089

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Feb. 15,> 14933.
~ Filéd sein. 4, 1931
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~- s’sheetœsheet 1
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Feb. 15, 1938.
Filed'sept. 4, '19:51
3 sheets-sheety 2
Feb. 15, 1938.
Filed Sept. 4, 1931
3 Sheets-Sheet 5
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Patented Feb. 15, 1938
A Edwin E. Turner, Jr., West
» signor to‘Sube Signal ßempany, Boston,
Mass., a corporation of Maine
‘_ Application september a resi, sensi No. sertie
(Ci. 23d-_72)
The present invention relates to a system` for Vnet in a position away from the paper against
recording the receipt of signals, and more partie» _ the tension of a spring.
3 Cla.
ularly, to such a system which may be used for
measuring short time intervals or distances, as
5 in determining heightsA of aircraft from the
ground or the depth of water beneath a vessel
by the use of the so~called time of travel method.
>In the use ofaa recording device?or ñnding
depths and distances, in water or in air, a sig
,io nai is sent out and the time interval between the
transmission or“ the signal and the receipt of the
reflected echo from the object whose distance
is to he measured is recorded.
` The recording magnet is continually rotated
over the .surface of the paperbut the stylus on
the armature is so adjusted that it just does not 5
touch the surface of the paper. When a signal
is received, and the armature momentarily re
leased, the stylus produces a mark on the sur
face of the paper. Upon the establishing of the
plate current the armature is again retracted 10
îrom'the paper and, in this fashion, a short mark
is produced as the recording armature travels
Most recording systems either'employ means
over the surface of the paper.
The paper is preferably a Wax paper, having a
15 for producing an electrical discharge through a
recording paper or providing a stylus, which
makes a continuous mark upon a recording
war.v so that when the Wax is removed by the
paper and which, at the moment of the _receipt
of the signal indicating the measurement of the
20 time interval or distance, produces a serration.
These systems while operative are sometimes
base coloring diñerent from the coloring of the 15
marking of the stylus on it the color beneath will
Without describing further details ofthe sys~
tem, an »embodiment of the invention will be de- 20
quite sluggish and do not produce accurate rec»
ords. Besides this, the device for producing the
scribed in connection with the drawings illus- «
trating the same, in which:
_ Figure i shows a iront View of the recording
continuous-mark is apt to be rather large and _
2'5 clumsy, and cannot easily be rotated or moved.
Such is the diiïiculty with the galvonometer _
type of recorder which has been used at times
for this work. The diñiculty with discharging a
spark through a paper is that the spark cannot
30 easily be controlled, and there is a tendency for
the sparkl to jump through thepaper atv thesame. place for a considerable time until that
spot is so far away from the electrodes that it '
is easier lto jump through a new spot1 .The re
35, cording by means of a. discharge produces, there
fore, a somewhat irregular chart or recording
A moistened paper has also been used for re=
cording purposes, ‘but this is inconvenient for the
40 yaverage person to handle as the paper must he
properly moistened and if moistened teo much
may tear as the stylus moves over it.
In the device disclosed in the present applica“
tion, instead ci’. marking the paper continuously,
¿5 as is usually done, a recording magnet is pro
vided which, normally, continually has its arma
ture retracted from the paper and which, at
the moment of receipt of the signal, is released
so that the armature may move to mark the
50 paper. In this Way only a small niark is pro
duced on the paper when the signal is received.
The electromagnet oí the recording mi net is
preferably placed'in the plate circuit of a ther-x
mionic tube and the plate current of the tuhe is
55 normally usedto hold the armature ci’ the mag»
Figure 2 shows a side view;
_Figure 3 shows a section;
Figure e shows a detail of the paper driving
Figures 5, 6, and '7 show further details of the
paper driving mechanism;
Figure 8 shows a detail of the means for pro
ducing the marit on the _recording paper; _
Figure 9 shows the electrical connections of
the circuit, including _the receiving elements; and
Figure i0 shows partly diagrammatically the 35
synchronization of the system >for producing aA
wave impulse at the’proper position of lthe ren
cording arm.
fis shown in Figure l. there are provided two
side frames iv and 2 which are held together by 40
a rod 2i to which the frames are screwed and
by a top' piece E screwed to the frames i and 2
in the inwardly extending flanges t. Upon the
top plate 5 is mounted a gear box i which has
a shaft d extending through the right side wall, 45
as seen in Figure i.
This shaft t, which is the prime driving sha
for the `whole mechanism, is coupledby means
oi’ the coupling 9 to a driving motor which, in
depth sounding or distance measurement, is so 50
driven that the sound or energy impulse is given
out when the indicator oi the recorder is at zero.
This mechanism is shown in Figure 10. The
recording arm i5 may be continuously rotated
by means of the motor ist driving the shaft 8. 55
At a position of the arm I5 at one side of the
core' 2ï, made up of a group of U shaped lamina
recording paper at which the scale markings on
tions and pinned together by the pins 28, 28.
the paper begin and which, therefore, may be
About the core is Wound a coil 29 of sufficient
impedance to match or nearly match the imped
a sound or other impulse may be emitted by the . ance of the electrical circuit operating it; that
transmitter |60. The circuit |59 is at this point ' is to say, the coil 29 of the magnet is made to
have the same electrical impedance as the rest
closed by completing an electrical contact be
tween the contact elements |56 and |51 mounted of the circuit, as indicated in Figure 9, which in
on the switch block |58, thus applying the power cludes the vacuum tube it? and the other ele
source |55 to the sound producer. If the sound - ments of the circuit as measured from the points
producer |60 _is of the impact type, the circuit at which the coil is connected. At each end of
the U shaped core are p1ates30 and 3|, the plate
may be arranged in such a manner that the im
pact element is released by the operation of the 30 forming a guard about the armature 32, and
switch contacts. As indicated in Figure l0 the the plate v3| extending angularly and having a
thin spring strip 33 riveted thereto. The arma
15 contacts |56 and |51 are closed through the pro
jection |54 on the cam |53 which is driven ` ture 32 is riveted to this thin strip. The arma
through the gear box |52 through the shaft |5I ture is spaced from both poles 34 and 35 of the
U shaped core and has on its outer surface a
of the motor |50. The paper 20, as indicated in
marking point or stylus 36 extending slightly be
Figure li), is fed so slowly that successiverecord
20 ings I6I on the paper by each cycle of the arm yond the guard element 31. The pole 35 has a
I5 produce a continuous contour indicating the small projecting non-magnetic element 90 to a1-.
` depth. In the operation of the system shown in low rapid collapse of the magnetic circuit and
Figure l0 the sound is emitted at some positionV release of the armature upon operation by the
called the zero position as measuring a zero depth,
such as |62 which Vmay be, as is statedabove, the
zero position on the recording paper. In the
time that the _arm I5 travels to the point where
a record is produced the sound or other com
pressional wave will have travelled to its reñect
ing surface and have returned, whereupon it
30 affects the receiving system, shown in Figure 9,
to operate the armature of the recording mag
net 23. .This arrangement is in principle that
shown in Figure 1 of my United States Patent
No. 2,033,166, issued March 10, 1936, in which the
85 driving motor is 35, the sound producer 46, the
cam 43, the contacts 44 and 45, and the gear re
duction system comprising the elements 3l, 38, 39,
and 4U.
The sound impulse in soundings, when using an
impact oscillator, is given out'periodically so that
the recording device will read directly.
If desired, the recording device itself may be
provided with the proper cams as shown in the
United States Patent No. 2,033,l60, mentioned
45 above, to control the operation- of the im
pact oscillator but it is more usual to use a re
cording- device and a visual indicating device
together and to let one contrci the operation of
the sounding mechanism forV both measuring
The shaft 3 in the box 'i drives a Worm
I5, shown in’section in Figure 3, and the Worm
drives a gearv il which rotates the shaft i2
mounted on the bearings i3 and it in the gear
.at the left end of the shaft i2, as shown in
Figure 3, is attached an arm E5 having a counter
weight i5 at its upper end, as indicated in Figure
3, and a recording element it at its lower end
which will be described in detail later. The shaft
i2 at the rear has pinned to it by a set screw i3
a cam i3 which controls and operates the entire
feeding mechanism for operating the advance of
the recording paper 2i? in the desired time.
The entire recording device is mounted in a
casing, fragments of which are shown in Figures 2
and 3, as 22, 22 by means of the bolts 23, 263, 25,
and 2t.
The motor speed driving the shaft 3 is such
that the arm carrying the recording mechanism
rotates about one revolution a second.
speed may be decreased if desired so that only
twelve or twenty four records are> made per
The recording element is shown in detail in
75 Figure 8 and comprises a ti shaped magnetic
Normally the armature 32 is attracted to the 25
poles since electric current is flowing in the plate
circuit of tube lill, thus energizing the magnet 29
which holds the armature against the force of
the spring 33. The armature is substantially
positioned in a plane parallel to the plane of the 30
recording paper at the point of recording, as
shown in Figure 3; and, in fact, the armature is
always in this same plane because of the motion
of the arm i5 in a plane parallel to the plate 3
and because of the position of the armature 32 35
which is substantially parallel to the plate 3
Whether held in a retracted position or released.
The recording paper 2U which, as shown in
Figure 1, is calibrated by the lines 38, may be cali
brated in units of distance or depth for height 40
or distance measurement. The recording paper
is fed from a roll 39, mounted in bearings on
both sides of the frames I and 2 so that the roll
may be easily turned. One of the bearings is
shown dotted at the left of Figure 1. The roll 45
39 has a slot 4|, at the end of its shaft 4U, into
which slot the tongue of the shaft 42 fits as indi
cated in Figure 5. The shaft 42 sets in a sleeve
¿Sin the frame |, the sleeve 43 being formed as
a cap 44 at the end through which the end of the 50
shaft 42 projects. The shaft 42 is taken down
to a smaller diameter within the cap «'14 and be
tween the inner shoulder of the ylarger portion
of the shaft andthe cap end is a spring 45 to force
the shaft ¿i2 to the left, as shown in Figure 5, 55
against the shaft 40 of the roll 39. The shaft 42
is held in by the knurled knob d6 pinned to the
end of the shaft beyond the cap. The bearing
at‘the left end of the roll, as seen in Figure 1,
is adjustable so that the roll may be positioned
laterally to make the paper 2li feed properly
without uneven tension. The adjustment con
sists of a threaded shaft 6'! threading into the
collar «t3 iixed in the frame 2. The end of the
shaft di has a small projecting cylindrical rod
¿i9 on which the -roll shaft 4U rotates.
The knob 53 on the end of the shaft 4l is turned
until the holes 5|, 5i etc, are properly aligned
over the projecting teeth 52 on the feeding roll 53.
in feeding the paper, the paper first comes from 70
the roll 39, goes upward over the curved top 54
of the plate 3, which is adjustably mounted on
the frames i and 2 by means of the bolts fl, which
have on the further side of the plate 3 springs :35
pressing' the plate 3 outward against the bolt 75
heads. From the bottom of the plate the paper
goes over the` sprocket roll
which supplies the
power to pull the paper. The sprockets 52 mesh
in the holes 5l of the paper and advance it.
After passing over a portion oi the roll te, the
paper comes between the roll 53 and the roll te
which sets in a slot 5l in the pivoted arm ed, pirm
oted to the frame and tensioned to hold the roll
56 against the roll et. After passing over about
10 one-fourth of the roll 5E the paper proceeds down
wards and is wound up on the roll
The roll 59 moves in a slot t@ in the arm ti,
pivoted at 62 to the frame i on the right. The
arm is tensioned and held up by the spring 63. ' At
the left the rollis adjustably held in the frame 2
by the screw threaded shaft 56, Figure 1, which
has a. small projecting rod fitting in the end of
the roll shaft t5. The roll shafts t5 and ¿ill are
the same and when the roll shaft d@ is empty it
20 is transferred down to the bottom and a new roll
supplied to the top.
The roll shaft 5S is driven by the same mecha
nism which pulls the paper but at a slightly
greater surface speed than the paper is fed to
,25 keep a tension on the paper at all times.
, The feed of the paper will now be explained.
Idling on the cam i9 (Figures i and 3) is an
idler 66, mounted on the arm el pivoted at 68 in
the top frame 5. At the other end of the arm Gl
30 is a pivoted link member' 99 extending down
wards. The link S9 is pivoted at its lower end
to the pivoted lever llt. The pivoted lever l@
carries at the free end a pawl ‘li meshing in the
toothed gear wheel 72. Every time the high part
35 of the cam i9 raises the idler dit, it lowers the link
69 and raises the Ypawl 'it pulling up the toothed
hole allows the color of the paper to become
visible. In my device, however, I do not use a
spark, but the marking magnet as previously
described and illustrated in Figure 8.
The operation of the marking and recording
element is shown diagrammatically'in Figure 9. 10
Here the sound in depth sounding or distance
measurement may be received on the receiver |00 _
where its energy is translated into electric energy
on the lines lill. The receiver 000 may be a_microphone or a magnetophone. In either case the
sound energy from the water impinging upon the
diaphragm of the receiver will set up mechanical
vibrations which will generate or vary the cur
rent in the electric circuit which includes the
transformer d20 whose secondary isl connected to 20
the grid 405 to the tube E06. The receiver, if a.
microphone, may be supplied with direct current
from the battery E02 across which is a potenti
ometer E03. The received energy in the trans
former i015 is impressed upon the grid l05 of the
tube or valve H05 and by this means the tube |01
connected thereto brings about the operation of
the electromagnetic recorder whose coil 29 is in
the plate circuit of the tube 607.
The circuit for operating the coil 29 is the same 30
¿as that used and described in my copending ap
plication Seriall No. 270,660, April 17, 1928, Patent
No. 2,033,160, which also refers to my prior appli
cation Serial No. 220,719, filed September 20, 1927,
issued as Patent No. 1,991,430. If both an indi 35
cator as a neon tube and the present device are
to be oper-ated from this circuit, I use two tubes
When the pawl drops back the toothed gear
remains as it was because of a friction element
in place of the tube it?, connected in parallel to
the first tube iut, and operate the recording de
vice from one tube and the neon light from the 40
other tube, keeping thereby the plate circuit of
Mounted on the frame I is a L! shaped bracket
13, shown in Figure 7. This U shaped bracket
has holes at both sides through which the shaft
74 passes. At the left of the shaft le there is
45 pinned a sleeve l5, having a shoulder ‘it htting
in the U shaped member. Exterior. of the U
shaped bracket on the right side the tooth gear
‘l2 is pinned to the shaft in the collar lli, which
has a bearing surface on its left tace rubbing
50 against the outer surface of the bracket because
of the spring le which presses the shaft to the
left. This friction makes it impossible for the
toothed gear lf2 to follow back when the pawl
each tube separate.
Normally a plate current is iiowing in the plate
circuit of the tube iti of suihcient value to hold
the armature backwards against the tension of
the spring. When the armature is released as the
grid of the tube iil'i becomes negatively charged
for an instant during the receipt of the signal
the armature flies forward and makes a short
stroke on the paper by removing the wax at that 60
point. The armature is again retracted from the
paper after the signal has passed, recovering
somewhat slowly as explained in the copending
Each time that the pawl is raised, the worm l@
at the end of the shaft is turned and through this
the gear 30 meshing with it. The gear e@ turns
the shaft 90' carrying the drum 53 and thereby
No. 2,033,160 so that the point does not produce 55
moves the paper.
is used generally in recording Where a spark is
made. to puncture the paper and the heat of
the spark melting away the wax around the tiny
gear 12 one or more teeth.
about to be explained.'
The paper I use is a was coated paper such as
'I‘he gear til has its outer surface pressed
against the fiat disc t2 which in turn is-pinned to
the shaft ati 9i by means of a collar @it integral
with the disc t2. The gear @il is tensioned in
place by means oí the spring disc et which is ini
tially dished and then forced i'lat in assembly as
, the shoulder e5 oi the pulley wheel titi comes in
contact with it. lll’he wheel @t is pinned to the
shaft 90' and carries a spring belt tl, which
passes over the pulley @d for winding the paper.
70 The wheel 3% is given a speed such that the sur
face speed of the roll 59 will be a little faster
than the speedV of the paper, but the slip is pro
vided in the spring gear so that e. slight tension
only is exerted on the paper enough to keep it
now ' Patent
chattering and a series of dots on the paper. As
itis usual to have an impulse of very short dura
tion unless the proper precautions are'taken, the
magnet 2S may just about operate sufficiently to_
allow the marker to move towards the paper and
retract it before an actual mark has been made,
or at least before a mark of suiiicient length
is made, to be properly recognized. In order
to overcome this diiiiculty the size of the
condenser iìi and the resistance 822 is so regu 65
lated and chosen that while a sudden interruption
oí current flowing in the coil 29 occurs, the resto
ration of the full value of current to hold the
armature in its retracted position will be some
what delayed in taking place. This regulation is 70
easily effected by proper choice of values of
capacity in the condenser i2! and resistance in
the element 522 so that the circuit will not recover
its initial normal condition until some time after
the impulse has occurred. This duration'of time 75
is usually chosen as covering perhaps a time inter
val corresponding to three or :our fathoms in the
measurement oi’ the depth.
magnet for retaining said armature in a limited
outward position.
2, A device to be mounted at the end of a
The recording magnet is provided Ywith an air
gap at all times even when retracted by means of
rotating arm for producing a record on a nat
recording sheet across which the arm is to move
the stop 9B so that the magnetic circuitv is not . comprising a magnet having two pole elements
Worked at saturation and will collapse quickly.
In order to inform the operator when the paper
is entirely used, in parallel with the coil 29, is
having parallel pole surfaces, an armature formed
and positioned to span across said pole surfaces,
spring means mounting said armature in position
placed an indicator w8 such as a buzzer, the cir . with a spring tension away from said pole pieces, 10
cuit of which is closed when the contact arm |09 said mounting being attached at one _side of one
comes over a hole in the paper roll at the end
of said poleelements adjacent the pole surface of
thereof. At that time a contact is completed - said pole element, means applied at the other
through the plate 3 and-the conductor lill and
the buzzer operates continuouslyy or practically
since the plate current ñows except for the
very short time of the signal receiptu
Having now described my invention, I claim:
l. A device to be mounted at the end of a rotat
ing arm of a recorder and adapted to move across
end of said armature limiting the outward motion
of said armature by the action of said spring, and 16
a stylus point Vmounted on said armature directly
over the other of the pole surfaces.
3. In a distance measuring system by the use oí
compressional waves, a marking means consist-u
ing of an electromagnet and an armature having
a marker thereon, amplifying means normally
maintaining current in said electromagnet and
a ñat plate bearing a recording sheet comprising
a U-shaped magnet, a nat armature positioned
substantially to span the pole elements of said capable of interrupting said current, means for L
magnet, said armature having means attached receiving-an impulse of compressional wave
thereto and cooperating with meansattached to energy, means responsive to said last named
one side of the U-shaped magnet for yieldingly> means to cause said amplifying means to inter
positioning the armature in said position, said rupt said current, and means operatively con»
armature having a stylus point positioned op
nected to said amplifying means for controlling l
posite the other side of the said U-shaped magnet.> the time of building up of the current after the '
said yieldlng'means exerting an outward force interruption has occurred..
from scid
net and means mounted on said
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