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Sept. 13, 1938.
H. G. DYBVlG
I
BALANCING
2,130,122 '
MACHINE ‘
5 Sheets-Sheét 1
Filed Jan. 18, 1937
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FIG. 1.
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INVENTOR.
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ATTORNEY.
Sept. 13, 1938. .
H. e. D‘YBVIG
2,130,122.
BALANCING MACHINE
-
Filéd< Jan. ‘18, 1937
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3 Sheets-Sheet 5‘
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Patented Sept. 13, 1938
2,130,122
UNITED STATES PATENT OFFICE ~
I
2,130,122
I
BALANCING momma
Henry G. Dybvig, Dayton. Ohio, assignm- to Harry
.
W. Moore, Dayton, Ohio
Application January 18, 1937, Serial No. 121,183 ’
12 Claims. (CI. 73-51)
This invention relates to balancing machines respective of the position of the angle of unbal
and in more particular to a balancing machine
utilizing a‘ cathode-ray tube to indicate the angle
of unbalance.‘
ance. Furthermore, it is very desirable to have
a device that will indicate both the angle of un-‘
balance and the‘magnitude of unbalance upon
»
5
In testing bodies for unbalance upon balancing
machines, the vibration caused by the unbalance
of the rotary body is. utilized in measuring the
amplitude of vibration and the angle of unbal
ance. This has been done electrically by various
10 devices, illustrative of which is a rotary light as,
disclosed in the Harry Moore application Serial
No. 104,075 ?led Oct. 5, 1936 for Dynamic bal-.
ancing apparatus, and a plurality of stationary
the same dial 'or screen instantaneously.
This 5
device should preferably measure the angle of .
unbalance irrespective of the speed of the rotat
ing body and if an electrical contact is used,
irrespective of the frequency of the pulsating cur
rent. In other words, the circuit should ‘prefer- 10
ably show the angle of unbalance without anyv
phase shift. This may be accomplished by util
izing a circuit that does not have any inductances _
lights energized periodically through a suitable
and capacities, as has been disclosed in the Moore
15 distributor, as disclosed in the Moore application
Serial No. 680,225 ?led July 13, 1933 for Dynamic
copending applications Serial Nos. 680,225 and
104,075 supra. When usinga cathode-ray oscillo
balancing apparatus.
graph for indicating the angle of unbalancethe
An object of this invention is to provide a rotary
?eld either electrostatic or electromagnetic, de
20 ?eeting a cathode-ray periodically to thereby in
dicate the angle of unbalance.
'
Another object of this invention is to produce
an electrically rotating ?eld by tapping an an
nular resistance at a plurality of ‘points.
25
Another object of this invention is to generate’
two sign wave curves synchronized ‘with the ro
tating body for producing a rotating ?eld.
Another object of this invention is to provide‘
, a rotary ?eld, the magnitude of which may be
30 controlled so as to obtain the proper de?ection of
voltage is applied to the de?ecting plates, there
by eliminating any hazards incurred by the cur
rent either lagging or leading the voltage.
"
.
20
Referring to the drawings, the reference num
eral [0 indicates the base of a balancing machine
having mounted thereupon a plurality of stand
ards i2, each provided with a centrally disposed
vibratory support l4 ?xedly mounted upon the 25
base ill and carrying a vibratory‘head it that
may be locked in position by a pin I8 actuated
from locked position to unlocked position by a '
suitable handle 20 passing through an angular
pr diagonally disposedslot 22. When the pin or 30
latch I8 is in the “down” position the vibratory
‘
_
head It is free to oscillate upon the vibratory sup
Other objects and advantages reside in the con
.
.
struction of parts, the combination thereof and port I4.
The vibratory head [6 may be provided with
the mode of operation, as will become more ap_-_
suitable bearings .26 adapted to rotatably sup- 35
35 parent from the following description.
' I
Fig. 1 is a schematic view showing a dynamic port the body 28 to be tested, which may be driven
the cathode-ray,
balancing machine similar to those disclosed in
'the above identi?ed Moore applications, having
_
added thereto suitable attachments for use with v
.40 a cathode-ray oscillograph.
'
Fig. 2 discloses a transverse cross sectional view
of the device disclosed in Fig. 1.
‘
Fig. '3 is an enlarged fragmentary detail view
of a portion of the device disclosed in Fig. 2.
45
Fig. 4 is a schematic wiring diagram of the pre
ferred embodiment.
Fig. 5 discloses a schematic wiring diagram of a
modi?cation.
.
I
.
Fig. 6 discloses a schematic wiring diagram of
through a ?exible drive connection 30 from a suit
able motor -32, provided with a speed control
lever 34.
.
-'
'
_
'
when the circuit through the motor is closed 40
the motor will rotate the body 28 to be tested at
any speed desired by manually adjusting the lever
34. If the body to be tested is unbalanced, cen
trifugal force will cause the vibratory head "5
lized to indicate the angle of unbalance and the '
magnitude of unbalance.-
The device for in
dicating the magnitude of unbalance will now be 50
50 another modi?cation.
. Fig. 7 discloses a schematic wiring diagram of described.
_
A gauge 38 may be mounted upon the standard
a third modi?cation.
In testing bodies for unbalance, it is very desir- _ I 2 and is provided with a suitable reciprocatory
able to have an indicator that indicates the angle stem 40 actuated in one direction by an abutment
55 of unbalance instantaneously and accurately, ir
.
to oscillate upon the vibratory support It, that is, 45
when the pin. [8 is in the “down” position. The
oscillation of the vibratory head 16 may be uti
42 mounted upon the oscillatory or~ vibratory 55
2
2,130,122
_ head I6.
The stem 48 through a suitable me
chanical amplifying device actuates a pointer 44
underlying a suitable dial on the gauge 38.
The
face of the dial may be, provided with suitable
graduations having proper indicia from which
‘'
Let it be assumed that the rotary contacts 88
and 88 rotate in a clockwise direction in syn
chronism with the body 28.‘ > As the contact 88
rotates downwardly, it will eventually come in
contact with the point 18 which is grounded; At
the magnitude of .unbalance may be ascertained. - this instant of time the voltage supplied to the
This magnitude of unbalance may be determined plate 88 will be zero. ' When in this position, the
from suitable charts oriderived from formulas contact 88 will have rotated to a vertical position,
applicable to'the body tested at the particular
10 frequency at which the reading is taken.‘
The stem 48 is preferably mounted for move
ment in only one direction, that is, the stem 48
may be telescoped into the sleeve 46 butthe re
turn movement is prevented by a latch 48 piv
'15 otally mounted at '58 to a suitable bracket 52
?xedly attached to the tubular sleeve 46. The
stem 48 isi?rovided with a smooth surface that
is engaged -by member 48 biased in a counter
clockwise direction, as viewed in Fig. 2, by a
20 suitable spring 54. In order to release member
48 and the stem 48, it is merely necessary for
' the operator to actuate the push button 56, which
rotates member 48 in a clockwise direction
‘ » against the spring 54 out of clearance with the
25 "surface of‘ the stem__48, thereby permitting the
stem 48 and the pointer 44 to return to zero posi
tion.
A reduced tubular extension“ is provided
as viewed in Fig. 4, being then supplied with the
maximum positive voltage, so that the maximum 10
amount of positive voltage is supplied to the
plate 88, assuming, of course, that the contacts
64 and 66 are closed at this instant of time. As
the contacts continue rotating, the contact 88
will be supplied with a negative voltage, which 15
will be increasing and the contact 98 supplied
with a positive voltage that is decreasing, until
the contacts have rotated through another
quadrant, when the contact 88 will be supplied
with the maximum negative voltage and the con 20
tact 88 with zero voltage, again, assuming that
. the contacts 64 and 66 are closed at this instant‘
of time.
.
It is well known to those skilled in the art that
the cathode-ray is de?ected towards the positive‘ 25
plate and away from the negative plate. Fur
thermore, it is well known that the magnitude
of de?ection by either plate is proportional to
with a slot for- member 48 and also carries a the voltage supplied to the plate. From this
arrangement it can be readily seen that if the 30
30 bracket 68 adjustably mounted upon the exten
sion 4| by a suitable screw 62. Bracket 68 on contacts .64 and 66 remain closed, the cathode
its lower end carries a contact member 64 aligned ray will travel through a substantially circular
with a contact member 66 mounted upon the ' path about the center of the screen I84. As the
vibratory head I6 in such a relation that the cathode-ray will be de?ected only when the con
tacts 64 and 66 are closed by the movement of 35
35 contacts,“ and 66 close an electrical circuit dur
ing each revolution of the rotary body. The the vibratory support, the angle of unbalance
contacts 64. and 66 are included in an electrical may‘ readily be determined. As the contact 64
circuit‘ including a device for indicating the angle
of unbalance, which will now be described.
40
As may be best‘seen by referring to Fig. 4, the
is carried by the tubular extension 4|, which
adjustably supports bracket 68, this bracket 68
is preferably adjusted so that the contacts 64
contacts 64 and 66 are connected to a pair of - and 66 will remain closed for only a very short
leads 68 and 18, the lead 68 being connected to
one side of an annular resistance member 12 and
the lead ‘I8 having its other end connected to
one terminal of a battery ‘I5, having a terminal
connected through a lead ‘I6 to the opposite side
of the annular resistance member 12.
The two halves of the annular resistance mem
period of time during each revolution of the
rotary body 28 when the body. is tested. If this
period of time is too great, the bracket 68 may
be adjusted by rotating the screw 62, so as to 45
cause the contact 64 to close for a sumcient period
vof time. The angle of unbalance is preferably
measured when the body rotates at a speed higher
ber 12 are equally balanced, that is, the resist
than the critical speed.
ance of one half is equal to the resistance of the '
In the event that the voltage supplied by the
battery ‘I5 does not produce the desired de?ec
tion, resistances may be added to the battery
other half, so that the midpoint indicated by
reference character ‘I8 which has been grounded
-
.
.
has a zero potential. The resistance'element ‘I2 . circuit so as to reduce the battery voltage, there
is connected to a cathode-ray tube by a circuit by reducing the magnitude of de?ection. If the
voltage is insu?lcient across -the temiinals of the
arrangement which includes the following ele
'
battery 15, ampli?ers may be added to the circuit
One de?ecting plate 88 of the cathode-ray tube‘ - between the slip rings 86 and 86 respectively, and
is connected by a suitable lead 82 through a the plates 88 and 88. Any suitable cathode-ray
brush 84 to the slip ring 86. This slip' ring 86 circiut may be used to amplify the signals or
.is electrically connected to arotary contact arm voltages and to energize the cathode-ray tube.
88 contacting the resistance element ‘I2 and Such circuits are disclosed in ffThe Cathode-Ray
. rotating'in synchronism with the body 28 to be Tube at Work” by Rider, published by John F.
ments.
tested.
Rider, 1440 Broadway, New York city.
V
,1
Another de?ecting plate 88 is connected by a
In the modi?cation disclosed in Fig. 5 a pair
85 suitable lead 82 to a brush- 84 contacting with a of contacts H8 and H2 has been mounted upon
second slip ring 86, electrically connected to a the vibratory support and a pair of cooperating
rotary contact 88, also rotating in synchronism contacts H4 and II 6 has been mounted in ?xed
with the body 28 tobe tested, but disposed at an ‘spaced relation from the contacts H8 and H2.
angle of 90° from the rotary contact 88. This These contacts have been mounted between- the
70 arrangement supplies a; rotary' ?eld to the de?ecting plates 88-and 88 of the cathode-ray
cathode-ray tube whenever the contacts 64 and tube and slip rings I28 and I22 respectively.
66 are closed.
The plates I88 and-I82 in the
vcathode-nary. tube, ‘oppositely ‘disposed with re
spect to the plates 88 and 88 respectively, are
76
grounded.
'
.
'
The slip ring I28 is connected to one terminal
of an armature or generator winding I24 mounted
for rotation between a pair of poles I28 and I28.
The other terminal of the winding I24 may be 75
3
2,130,122
grounded to the rotor shaft I30, grounded in any
suitable manner.
pressed upon the de?ecting plate 90 about the
same time as the voltage generated by the coil
_
The slip ring I22 is ‘connected to a winding
I34, having the other end thereof grounded to
the shaft I30. The winding I24 is displaced 90°
I 24 also supplied to this plate 90 is zero, or very
nearly so, the reading upon the cathode-ray tube
will be very inde?nite and nearly meaningless.
out of phase with the winding I34, so that the‘ If this is the case. the voltage generated by the
phase displacement of the voltage that is_gener- - coil I50 should be impressed upon the de?ecting
ated by'the two windings is 90°. For the sake‘ of plate 20. This may be accomplished by shifting
clearness the windings I24 and I34 have been _ the-switch I50 from the terminal I60 to the ter
10 separated. These windings are-mounted upon minal I62 and the switch I66 from the terminal
10
the same laminated ‘core I35, rotating between I68 to the terminal "I, closing the switch I43
a single pair of pole pieces I26 and I28. By_clos
and opening the switch I46. By so doing, the
ing the contacts II 0 and II 4 and the contacts circuit is completed through the switch I43 from
“2 and H6 by the vibration of the vibratory the winding I24 to the de?ecting plate 30 and the‘
15 support, it can be readily seen that the cathode
ray is de?ected upon the screen I04 to indicate
the angleof unbalance. Y The magnitude of de
?ection may be controlled by a pair of suitable
variable resistors I40 and I42 connected from
20 the high potential terminal of the windings -I24
circuit is completed through the winding I34
connected in series ‘withthe winding I50 to the
de?ecting plate 20.
>
_
The switches I43, I46, I53 and I66 are prefer
ably mounted upon a common actuator, so'that
all the switches may be actuated simultaneously.
and I34 to the’ ground. By adjusting the con
so as to throw the coil I50 in series either with
tacts, the magnitude of the voltage may be’ the coil I24 or with the coil I34. The voltage
changed.
~
generated by the coil I50 may be ampli?ed by a
In the modi?cation disclosed in both Figs. 4 suitable ampli?er I12. The resistors I40 and I42
and 5, the voltage applied to the‘de?ecting plates
may be varied so as to control the voltage output
of the coils I24 and I34.
'
In some installai?ons it might be desirable to
80 and 90 is absolutely independent of the mag
nitude of de?ection. The angleof unbalance is
indicated and that is all. The magnitude, of un
use one of the de?ector plates as a sweep circuit,
balance is determined by the gauge 38 mounted
that is, by connecting the plate to the A. C. winding, and to impress only the impulse voltage upon
the other-plate. For the purpose of illustration.
let it be assumed that the A. C. voltage generated
by the coil I24 is supplied to the de?ecting'plate
90 and only the impulse voltage generated by the
pick-up coil I50 is impressed upon the de?ecting
upon the standards.
_
'
In the modi?cation shown schematically in
Fig. 6, a device for generating voltage in pro
portion to the magnitude of unbalance has been
shown.
-
-
,-
‘
In the modi?cation disclosed in Fig. 6. the con
tacts actuated by the vibratory support have been plate 80. The alternating sine wave current will
eliminated and instead thereof. an auxiliary volt
then cause a straight horizontally disposed line
age is generated in response to the vibration of to be shown on the screen I04,v that is. in the
the vibratory support, which may be impressed absence of any voltage impulse being supplied ‘
40 upon either one of the plates 80 or 90 to indicate ‘to the de?ecting plate 80. If the de?ecting plate
the angle of ‘unbalance.
80 is connected to the coil I50. having its other
A generator including the rotor windings I24 terminal grounded, the line across the face of
and I34 generates a two phase alternating cur
the screen I04 will be de?ected. From the de
rent that is displaced 90° with respect to each l?ection it may readily be determined on which
other in. a manner identical to that disclosed in side of the center thede?ection takes place, also
the number of degrees the angle of unbalance is
Fig. 5. The slip ring I20 connected to the wind
ing I24 is connected by a lead I" through a from the vertical center axis of the screen; but
the particular quadrant containing the de?ection
switch I43‘ to the plate 90. The slip ring I22 sup
plies a voltage through the lead I44, including a ' is inde?nite. If, for example, the de?ection takes
place to the right of the vertical axis. the'angle 60
50 switch I 46. to the plate 80.
'oi' unbalance is located in either the ?rst or the
In addition to these voltages an induction or
pick-up coil I 50 is carried by- the vibratory head
I6. This coil links a portion of the ?ux from the
?xed electromagnet I52. which may be either a
permanent magnet or separately excited magnet.
fourth quadrant.
.
By disconnecting the A. C. voltage supplied to
the de?ecting plate 90 and disconnecting the
plate at from the coil I50, and connecting this
plate to the coil I34, a vertically disposed sweep
circuit is obtained on the screen I04. Now, by
excited from a suitable source of direct current.
through the magnetic coil I54. As the coil- I5'1
vibrates with the vibratory support, the number
of lines of ?ux linking the coil I50 varies. One
connecting the voltage impulses supplied by the
pick-up coil I50 to the plate 90, the sweep circuit
line will be de?ected either above or below the
center horizontal axis of the screen I04. If de-'
?ection takes place above the axis it is caused by
60 end I56 of the coil I50 is connected through a
suitable switch I58 either to a terminal I60 in the
lead I4I, or to a terminal I62‘ in the lead I44.
The other terminal I64 of the coil I50 is con
nected by a switch I66 either to the terminal I68
,in the line I4I, or'the terminal I ‘I0 connected to
the lead I44. The switches I58 and I66 should
be closed through the same line simultaneouslv.
that
if it is desirable to connect the voltage
an unbalanced condition in either the ?rst or the
second quadrant; but from the horizontal sweep
circuit line it was determined that the unbalance 65~
must be in either the ?rst or the fourth quad
rants. This leaves the angle of unbalance in the
?rst quadrant.
generated by the coil I50 into the circuit of the ' '
The same circuit arrangement may be used to
de?ecting plate 90, switch~l58 is connected to the
terminal I60, and the switch I66 to the terminal
analyze unbalanced "conditions in bodies having
both- rotary and reeiprocatory or other moving
I68; At the same time the switch I43 should
be open. This causes the voltage generated. by
the coil I50 to be impressed upon the de?ecting
parts, as for exampie airplane engines. The A. C.
generator, including the coils I24 and I34, may
then be driven in synchronism with the crank
plate 90. In the event that this voltage is im~
shaft of the engine, and thepick-up coil I50 to- 7
2,180,122
gether with its associated magnet connected for changes may be made in the form, details, pro
a relative movement with respect to each other on portion and arrangement of parts which generally
the engine at various points to indicate the angle, ' stated consists in a device capable of carrying out
the "degree, the period, the direction of vibratory the objects set forth, in the novel parts, combina
tion of parts and mode' of operation, as disclosed
movements and the phase relation of the vibra
tory movements with respect to the crank shaft. and de?ned in the appended claims.
Having thus described my invention, I claim:
In the modi?cation disclosed in Fig. '7, the shaft
I30 supports the. rotor I 3"- in close proximity to
the vibratory head l6, so that the rotor I35,
1. A device for testing a' rotary body including
means for rotating the body at high speed, a
cathoderray oscillograph having a cathode-ray
wardly and outwardly-from an E-shaped electro tube having means for de?ecting the cathode
magnet I80 mounted upon a'?xed support I82. ' ray, means for producing a rotating ?eld for de
Again, for_the purpose of clearness, the winding ?ecting the cathode-ray, said ?eld rotating in
I24 has been separated from the winding I34, synchronism with the body to be tested, and
means responsive to the unbalanced condition of 16
1-5 although in actual construction the two windings the body forcyclically energizing said de?ecting
10 including the windings I24 and I34, moves in
would be mounted upon the'same laminated core
and moving towards and away from the same
electromagnet I80. The voltage generated by the
windings) I24 and I34 will be in?uenced by the
20 relative position of the rotor I35 with respect'to
the stator I80, that is, when the heavy part of the
body to be tested actuates the rotor I35 to the
right, as viewed in Fig. '7, the rotor is moved into
or towards the magnet I80, so as to cause the
25 windings I24 and I34 to link a greater number of
lines of ?ux.
Now, as the heavy portion of the
body actuates the rotor towards the ‘left, as viewed
means of the cathode-ray tube from said rotating
?eld to thereby indicate'the angle of unbalance.
2. A device for testing a rotary body including
means for rotating the body, means for produc
ing an electrostatic ?eld rotating in synchronism
with the body, a cathode-ray oscillograph includ
ing a cathode-ray tube, and means responsive to
the unbalanced condition of the body for cycli
cally connecting the rotating electrostatic ?eld
to the de?ecting plates of the cathode-ray tube.
3. .In a dynamic balancing machine for testing .
a rotary body, vthe combination including means
in Fig. '7, the rotor I35 links a lesser number of for rotating the body at high speed, means for
lines of magnetic flux. Thus, it is seen that a generating a two phase alternating voltage syn
30 variable voltage is generated in the windings I 24. chronized with the rotating body, a cathode-ray
and I34 that is supplied to the de?ecting plates 80 ~
oscillograph including a cathode-ray- tube, and
means
responding to the angle of unbalance of
rangement, as may be readily seen, the angle of ' the body for connecting the alternating voltage
unbalance .may be. determined by the relative to the cathode-ray tube to thereby indicate the
and .90 of the cathode-ray tube. By this ar
position of the curve or closed loop that is seen on
the cathode-ray tube screen I04.
A disc I90 mounted adjacent to the rotor I35 is
adapted to abut a stop member I92 ?xedly mount
ed upon the support I82 to prevent therotor I35
coming in direct contact with the electromagnet
I80 if the swing of the vibratory. head I6 should
become excessive. This prevents injury to the
rotor and the stator. The disc I90 as shown
rotates with the rotor I35. Instead of such a disc,
45 any suitable abutment member rotatably mounted
upon the shaft I30 may abut member I92 carried
upon the support I02 to prevent injury to the
generator.
\
. The voltages‘ supplied to- the generator plates
may be controlled by adjusting the variable resist
ors I40 and I42. These resistors may be adjusted
by a graduated'knob or dial I45.‘ The cathode
ray may be adjusted to a predetermined position
on the screen I04 by turning the knobs I45 either
55 to the right or to the left. The amplitude of.
de?ection of the body to be tested may be deter
mined by the adjustment of the knobs I45 in the
modi?cations disclosed in Figs. 6 and 7. Each
angle of unbalance.
‘
_
4. In a dynamic balancing machine for testing
' the angle and magnitude of unbalance of a ro
tary body, the combination including a'vibratory
support for the body to be tested, means for ro
tating the body-at high speed upon the vibratory
support, a cathode-ray oscillograph including a
-cathode-ray~tube having ,a screen, means inter
connected to the, de?ecting plates of the cathode
ray tube for generating polyphase alternating
current synchronized with the rotation of the
body to be tested, and auxiliary means for gener
ating a voltage responsive to the angle of unbal-I
ance transmitted to the vibratory support selec
tively supplied to the de?ecting plates to indicate
the angle and magnitude of unbalance.
5. ‘In a dynamic balancing ‘machine .for testing
rotary bodies for unbalance, the combination in
cluding a vibratory support for the body to be
tested, means for rotating the body mounted upon
the vibratory support, a cathode-ray oscillograph
including a cathode-ray tube having means when
energized for de?ecting the cathode-ray, voltage
generating means for generating polyphase volt
graduation on these knobs may represent a cer vages energizing said de?'ecting means, said volttain weight required to counteract the unbalanced age generating means being'synchronized with
condition of the body tested. The magnitude of the-rotation of the body to be tested, auxiliary
weight, of course, is determined from experiments means for generating a voltage responsive to the
upon like bodies.
'
angle and degree of unbalance transmitted to the
In addition thereto if necessary the voltages vibratory support by the body; and means for
may be ampli?ed through suitable amplifying selectively supplying the voltage resp0nsive_'to
means generally found within conventional the angle. and degree of unbalance to the de?ect- ‘
cathode-ray os‘cillographs- now on the market.
These amplifying means are generally controlled ‘ ing'means to indicate the angle and degree of
by a graduated dial, so that the degree of ampli?
6. In a device of the character described, the 70
70 cation may be obtained from the dial reading and combination of a cathode-ray oscillograph in
unbalance.
thereby the-magnitude of unbalance may be‘
determined.
,
_,
..
Although thelpreferre'dmodi?cation of the de
vice'has been described, it will be-understood that
75 within the .purview of this invention various
_
_
_
_
cluding a cathode-ray tube having means for
de?ecting the cathode-ray’when, energized, with
' means for generating polyphase alternating volt-
ages suppliedto the- de?ecting means: for ener 76
5
2,180,122
gizing the same, and means for cyclically dis
turbing the energization of said de?ecting means,
the phase relation of said disturbing means being
indicated upon the screen of the cathode-ray
oscillograph.
"I. In a device of the character described for
use with a body having periodic movements, the
combination including. a cathode-ray oscillograph
having a cathode-ray tube provided with means
10’ for de?ecting the cathode-ray when energized,
means for generating pulsating voltages synchro
nized with the movement of the body, and means
for cyclically interconnecting the‘ voltage gener
ating means with the de?ecting means of the
15 cathode-ray oscillograph for indicating the rela
tive phase relation of the voltage impulses to the‘
movement of the body.
8. In a device of the character described for
use with a body having. rotary movements and
vibratory movements, the combination including
a cathode~ray oscillograph having a cathode-ray
tube provided with means for de?ecting the
cathode-ray, current generating means for gen
erating polyphase alternating current synchro
25 nized with the rotation of the body for energiz
ing the de?ecting means of the cathode-ray tube
so as to supply a rotary ?eld to the de?ecting
means, and auxiliary current generating means
generating a current synchronized with the vi
30 bratory movement of the body, said auxiliary
means energizing the de?ecting means of the
cathode-ray tube cyclically so as to indicate the
phase relation between the vibratory movements
and the rotary movements of the body.
9. In a device of the character described for
use with a body having cyclic movements, the
combination of a cathode-ray oscillograph hav
ing a cathode-ray tube provided with means for
de?ecting the cathode-rayv horizontally, and
10. In a device of the character described for
analyzing parasitic vibrations in bodies includ
ing rotary parts, the combination of a cathode
ray oscillograph including a cathode-ray tube
having means for'de?ecting the cathodel-ray with $1
current generating means for energizing said de
?ecting means, said current generating means in
cluding an A. C. current generator synchronized
with a-rotary part of.the body to be analyzed
for energizing said de?ecting means, and current .
generating means responding to vibratory move
ments caused by the body to be energized, said
second current generating means also energiz
ing the de?ecting means so as to indicate the
angular relation and the magnitude of the vibra
tory movements.
11. In a device of the character described for
analyzing parasitic vibrations in bodies includ
ing rotary parts, the combinationof a cathode
ray oscillograph including a cathode-ray tube‘ 20
having vertical and horizontal cathode-ray de
?ecting means with current generating means
for cyclically energizing the vertical de?ecting
means in synchronism. with the rotation of a ro
tary part of the body, a second current generat 25
ing means responsive to the vibratory movements
of the body to be analyzed for energizing the
horizontal de?ecting means, and graduated
means for indicating the magnitude of parasitic
vibrations of the body.
30
12. In a device of the character described for
analyzing parasitic vibrations in bodies includ
ing rotary parts, the combination of a, cathode
ray oscillograph including a cathode-ray tube
having vertical and horizontal cathode-ray de
?ecting means with current generating means
for cyclically energizing the vertical de?ecting
means in synchronism with the rotation of a ro
tary part of the body, a second current generat
40 means for de?ecting the cathode-ray vertically _ ing‘ means responsive to the vibratory movements
40
with current generating means for generating‘
currents, synchronized with the cyclic vibratory
movements of the body, and means for cyclically
supplying the generated currents selectively ‘to
45 the horizontal de?ecting means and the vertical
de?ecting means for indicating the phase rela-z
‘ tion between the generating means and the cyclic
movements of the body.
of the body to be analyzed for energizing the
horizontal de?ecting means, and graduated
means for controlling the de?ection of the cath
ode-ray, said graduated means indicating the
magnitude of the parasitic vibrations.
m’ germ-wits?- '
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