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Патент USA US2108983

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Feb. 22, 193s.
w. c;A H. FlNcH
2,108,983
TELEPICTURE SAYNCHRONI Z ING SYSTEM
Filed May ll, 1936
4 Sheets-Sheet 1
SYNCHRONIZIN
SIGNAL.
GENERATOR
TRANSMÍ‘ITER* î
n--a
RECEIVER
`
AUDIO
AND
AMPLIF'lER
RECTIFIER o__û
„nu
Feb. 22, 1938.
W, G, HAF-,NCH
'
2,108,983 `
TELEPICTURE SYNCHRONIZING SYSTEM
Filed May ll, 1936
4 Sheets-Sheet 3 «
54
‘william
W.WNmR.
ATTORNEY.
Feb; 22, 193s.
w, G. Hf FINCH'
2,108,983
TELEPICTUR‘E SYNCHRONIZING SYSTEM
Filed May 1l, 1936
l
4 Sheets-Sheet 4
9
r
_
‘
'
INVENTOR.
wallzamrgîíbßì’nclz,
Inf/¿wdr
ATTORNEY.
2,108,983
Patented Feb. 22, 1938
UNITED STATES PATENT OFFICE
2,108,983
TELEPICTURE SYNCHRONIZING SYSTEM
William G. H. Finch, New York, N. Y.
Application May 11, 1936, Serial No. 78,993
(Cl. 178-695) '
‘ 6 Claims.
This invention relates to synchronizing sys- . of the worm changes the phase relation between
tems, and more particularly relates to novel
methods of and apparatus for maintaining a
telepicture receiver in phase synchronism with
5
the transmitter.
-
Prior synchronizing systems comprised a fric
tion clutch interposed'between the driving mo
tor and the telepicture drum. synchronizing
signals were used to disengage the friction clutch
10 until the receiver drum was in phase synchronism
with the corresponding transmitter drum and
then re-engage the clutch so that the receiver
drum would continue to rotate in> proper phase
synchronism. However, a friction clutch could
l5 not maintain accurate phasing of the apparatus
since slight slippage inherent in the friction
the motor and the drum- without interrupting ythe
positive driving connection therebetween.
The worm is turned when the drum is out of
phase synchronism 'with respect to the trans- 5
mitter drum under the control of cyclic syn
chronizing signals. Normal interlocking of the
Worm Wheel with the. worm gear permits nor
mal rotation of the telepicture drum. However,
when the'worm wheel is turned, a phase co-r- 10
recting motion is superimposed upon the normal
rotation of the worm gear connected to the drum.
In a preferred arrangement, the worm wheel
moves the worm gear in a direction opposite to
the normal rotation thereof. The superposition 15
of the two opposite‘rotative effects produces a
resultant
rotation of the drum. Since the posi
clutch, and intensified by wearing thereof, could not positively predetermine phase synchronous tive driving relation between the motor and the
drum is' maintained during angular correction,
positions.
`
`
‘
In my Reissue Patent No. 19,575, I disclose a
20 positive driving connection between the scanner
and the motor. The positive driving connection
includes a pawl and ratchet wheel which are
normally engaged to maintain'the scanner in
2, operation. When the scanner is out of phase,
the positive driving connection is disconnected
at the pawl and ratchet wheel until the scanner
is in proper position. A cyclic synchronizing
signal reengages the pawl and ratchet to continue
30 the synchronous operation- of the scanner.
In my co-pending application Serial No. 65,869,
filed'Feb. 26, 1936, I disclose a positive or over-.
running clutch in the positive driving connection
between the motor and the telepicture drum.
l) The receiver drum is rotated at a slighly faster
rate thanthe corresponding transmitter drum.
The overrunning clutch is disengaged at a pre
determined angular position of the drum until
the synchronizing signal reengages it. The syn
chronizing signal is transmitted during the cor
40 responding angular position of the transmitter
my invention may be termed a controlled slip 20
driving mechanism. The slip, or relative angular
change between the motor and the drum is di
rectly controlled by rotation of the worm wheel
normally interlocking with the wormv gear.
In a preferred embodiment of my invention,
the worm wheel superimposes a speed of rotation
upon the drum equal to its normal speed of ro
tation but in the opposite direction or sense
thereto. 'I‘he resultant is an effective stand
still or'interruption of rotation of the telepicture 3
drum without the use of a friction brake, clutch
or the like. The drum is subjected to the con
trolled slip angular correction if it reaches a pre
determined position in its rotation cycle beforeA
the synchronizing signal is received. 'I'he effect 35
of the controlled s_lip is to maintain the drum
'
at this _predetermined position until the syn
chronizing signal is received without interrupt.
ing the positive driving connection between the
drum and the motor. The synchronizing signal .40
interrupts the controlled slip of the drum to co-n
drum so that both drums are maintained in ac
tinue its rotation in accurate phase synchronous `
curate phase synchronous relation.
In accordance with my present invention, I
relation with the transmitter drum.
Itis accordingly an object of my present in
vention to provide novel methods of and means 45
for maintaining remote electro-mechanical sys
contemplate a positive driving connection be-v
tween the motor and telepicture drum with means
for changing the relative phase relation between
the motor and the drum without interrupting
the positive drive connection.
»0
The motor drives the telepicture drum through
a worm and worm gear arrangement which nor
mally interlock to 'v transmit the rotative power
in a positive driving'r'elation. Means are pro
vided for rotating the worm when the receiver
55 drum is out of phase synchronism. 'I'he rotation
tems in synchronous relation.
.
’
»
Another object of my invention is to provide
novel methods of and apparatus for maintaining w
a telepicture receiver in phase synchronism with
its transmitter.
It is still another object of my invention to
provide novel methods of and means for effecting
stand-still of a driven member while maintaining u
2
2,10S,9@3
on photoelectric cell it produces corresponding
a positive driving connection with its source of
motive power.
electrical signals which are-ampliñed by ampli
’
fier 22. A light “chopper” or an audio frequency
carrier wave may be employed with the amplifier
22 to facilitate transmission of the varying uni
directional picture signals as is well known in
A further object of my invention is to provide
novel methods of and means for changing the
Ul relative angular position of a rotating member
without interrupting its positive drive connection
to the driving member.
It is still a further object of my invention to
j provide a novel synchronizing system whereby the
translating member at a remote station is main
tained in phase synchronous relation with the
corresponding member at a transmitter station by
controlling its angular position with cyclic syn
chronizing signals without the interruption of a
-
. The telepicture signals may be directly trans
mitted to a remote station overl wire lines or may
be transmitted by radio transmission _ means. 10
Figure 1 illustrates a transmitter 23 connected
to the output of ampliñer 22 for converting the
audio frequency telepicture signals into corre
sponding radio frequency signals which are radi
15
positive driving connection to the source of nio-=
tive power for the translating member.
ated by antenna 2d.
These and other objects of my invention will
become evident in the following description taken
for effecting synchronization of the transmitter
picture transmitter.
.
picture receiver.
Figure 3 is a pian view of a preferred embodi
25 ment of ' a telepicture receiver embodying the
novel phasing mechanism.
Figure 4 is a longitudinal sectional View taken
along 4_8 of Figure 3.
Figure 5 is the cross-sectional view taken along
30 5-5 of Figure 4, illustrating the operation of the
phasing mechanism oi’ my present invention.
Figure 6-is a modification of my invention cor
.
Figure 7 is a longitudinal cross-sectional view
of ~ a further modification of my present inven
tion.
scanning apparatus in a manner to be described
in detail. The synchronizing signals are prefer
ably transmitted once per scanning operating. 20
Figure 2 is a schematic illustration of a tele
responding to Figure 5.
l
synchronizing signals are cyclically transmitted
in connection with the drawings, in which:
20
Figure 1 is a schematic illustration of a tele
'
Figures 8 and 9 are sectional views taken along
8-8 and 9-9 of Figure 5 respectively showing
details of the synchronizing apparatus.
40
the art.
Figure 10 is an end view of the embodiment
corresponding to Figure 7 illustrating the syn
chronizing mechanism control.
The schematic diagrams Figures 1 and 2, of a
telepicture transmitter and receiver respectively,
are described to more clearly set forth the func
tion and relation of the synchronizing mecha
nism of my present invention. It is to be under
When a drum is used as in the preferred em
bodiment, the "underlap” period of the rotation
cycle is employed to transmit the synchronizing
signal. The underlap period corresponds to the
portion of the picture drum where the opposite 25
ends of the picture i3 are gripped or otherwise
fastened into position on the drum. In a con
tinuous sheet system, the synchronizing signal
is transmitted during the return oscillation
movement, marking the beginning and end of 30
each scanning line excursion. The transmission
of a synchronizing signal for a continuous sheet
system is described in my Reissue Patent No.
19,575.
A cam 25 is mounted upon the shaft 26 of the 35
telepicture drum lll. A projection 2l of the cam
25 is positioned angularly corresponding to the
underlap portion of the drum M. The edge 28
of the picture sheet i3 determines one side of the
underlap zone and is gripped by clamping means 40
internal to the drum I4 in a manner preferably
as described in. my co-pending application Serial
No. 72,990, filed April 6, 1936.
The synchronizing cam switch 30 is cyclically g
closed by the cam projection 21 to impress suit 45
able synchronizing impulses upon the ampliiier
22 from the synchronizing signal generator 3i.
stood that the telepicture system and circuits ` synchronizing switch 30 is connected in series
described are by example only and that the syn
50 chronizing mechanism to be hereinafter described
in detail is applicable to other telepicture or fac
simile systems.
Referring to Figure 1, a source of light I0
generates a beam I I focused to a point by a lens
system I2 upon the picture I3 to be transmitted,
which is mounted on the cylindrical drum I4. Ii’
the picture is scanned one hundred lines per
inch, the diameterof the light spot focused upon
the picture I3 vshould be .01 inch. The retracted
60 beam I5 from the .picture is focused upon the
photoelectric cell I6 by lens system I'I. The in
tensity of the refracted beam I5 is proportional
to the shading of the picture elements which are
with the synchronizing signal generator 3l output
to a suitable portion of the telepicture amplifier 50
22 schematically indicated in Figure 1. 'I‘he syn
chronizing impulse effective during the underlap
period is preferably of intensity somewhat greater
than the maximum or “white” telepicture signal
intensity in order to readily distinguish the syn 55
chronizing signals from the telepicture signals
at the receiver.
Á
'
The synchronizing signal generator 3 I may be
a direct current source which produces a uni
directional impulse at each closure of cam switch 60
30 or may be an audio carrier frequency signal
which is unmodulated during the synchronizing
period and is suitably modulated by the picture
signals during the remaining period of the cycle.
successively moved past the light beam II.
The picture drum I3 is rotated by worm I8 and ' A preferred embodiment of such a method for 65
worm gear I9 which suitably reduce the speed signal generation forms the basis of my co-pend
of the motor 20.
Motor 2U is preferably a syn
chronous motor connected to/a commercial elec
trical supply line 2I, for example a sixty cycle,
70 110 volt system.
'I'he drum may be driven at a
normal speed of 100 revolutions per minute
which, with one hundred lines scanned per inch,
results in one inch of the picture traversed per
minute.
75
The retracted picture light beam l5 impinging
ing application Ser. No. 74,419.
.
Figure 2 is a schematic diagram of a telepic
ture receiver used in conjunction with the trans
mitter of Figure l. and employing the synchroniz 70
ing mechanism of my present invention. A radio
receiver and rectifier 32 is connected to a receiv
ing antenna 33 for receiving the radio trans
mitted signals from the radio transmitter 23.
If a wire line is used, suitable amplifying and line 75
3
arcanes
equipment are instead employed.
The ’output
of the receiver and rectifier 32 are connectedto
an audio amplifier 3d. The output of audio
amplifier 34 is coupled to a class B push-pull out
put stage 35-36 by an inter-stage coupling
transformer 31. The output of the push-pull
stage 35-36 is connected tothe primary 38 of
the output transformer 39. The output of the
secondary 45 of transformer 3S is connected to
a photolamp 5I containing a gas such as neon,
for producing a light beam 62 output in accord
ance with the telepicture signals received. The
light output «32 from lamp 5I is suitably focused
upon the record sheet 49 on the receiving drum
55 by a lens system 42’.
.
I prefer to use a neon crater photo-lamp di
having a control electrode ¿43 which is connected
to one terminal 45 of the transformer secondary
LIU, and an auxiliary or striking electrode 45. The
crater plate Q6 of lamp 5I is connected to the
positive terminal of a suitable direct current
source 51, the negative terminal of which is con
nected to ground. The other terminal ¿i8 of the
transformer secondary di) is connected to the
crater plate 46 through a variable resistance 5I.
The auxiliary or striking electrode 45 is con
nected to ground by lead 52. As is Well known
in the art, the auxiliary electrode 45 maintains
a striking or discharge condition at the photo
lamp crater plate 66, so that it will always be in
readiness to respond to telepicture signals intro
duced between the plate 56 and the control grid
¿33. A by-pass condenser 53 is connected between
the output terminal 48 and ground.
The receiver drum 55 is driven by a syn
chronous motor 56 connected to supply lines 2l'.
The lines 2 I ’ are preferably from the same alter
nating current supply lines 2| as those of the
transmitter although such condition is not essen
tial. The synchronous motor 5t drives drum 5@
through the schematically indicated synchroniz
ing phase adjusting mechanism 55. The phase
synchronizing or angular drum adjusting mech
anism 55 is described in detail hereinafter. The
drum phasing mechanism 55 maintains a posi
tive driving connection between the shaft 55
which is driven positively from the motor shaft
51 through worm 58 and worm gear 59, and the
shaft 6B directly attached to the receiver drum
5i?.
'
'
A control plate 5I cooperating with the phas
ing mechanism 55 is actuated by the synchroniz
ing magnet 62 through its armature 63. Drum
50 is preferably driven at a slightly faster speed
55 than the corresponding transmitter drum I6, for
example in a ratio of 101:100.
The phasing mechanism 55 is under the con
trol of the synchronizing magnet 62 to maintain
the drum 50 in phase synchronism with the
60 transmitter drum I ê as will be hereinafter set
ñows to the push-pull amplifier stage 35-36 dur
ing the reception of the telepicture signals.
The cam switch ‘l5-_1I is opened by the pro
jection 13 of the cam 12 during the synchroniz
ing or underlap period of the receiver. The CT!
anode current from source 61 is accordingly di
rected to the ampliñer 35-36 through the syn
chronizing relay 15, which relay 15 is otherwise
short-circuited by switch 1li-1I.
The synchronizing signal, as hereinabove de 10
scribed, occurs during the underlap period of the.
picture transmitter, and is preferably of greater
magnitude than the telepicture signals. Syn
chronizing relay 15 is preferably a marginal relay
responding only to the increased magnitude sig
nals so as to avoid the possibility of interference
of the synchronizing action by any of the tele
picture signals. The push-pull ampliñer 35-36
rectifles an alternating current synchronizing
impulse in the anode lead if such is used, and 20
the actuation of the relay 15 is by rectified or
unidirectional current as will be understood by
those skilled in the art.
Although I prefer to use synchronizing signals
of increased intensity, and a marginal synchro
25
nizing relay, I have also successfully employed
synchronizing signals of intensity equal to the
maximum intensity picture signals to operate an
ordinary relay. It is also to be understood that
the synchronizing magnet 62 may be directly en
30
ergized by the synchronizing signals, displacin
the relay 15.
'
The receiver drum 5i) is prepared for the syn
chronizing signal during its underlap period by
cam 12.
'I‘he synchronizing signal will flow
through tol energizeV the synchronizing relay 15
which then closes the relay contacts 55-(56,
locally energizing the synchronizing magnet 62.
The synchronizing magnet 52, when energized,
will attract the armature 63 away from control 40
plate 6I to permit the phasing mechanism 55 to
continue to normally drive the receiver drum 50;
i. e., if the drum 50 were in phase synchronism
and in proper phase, the release of armature 63
away from the plate 6I would avoid phasing or 45
angular correction by the mechanism 55.
The control plate 5I »of the phase correcting
mechanism 55 has a notch 16 cn its periphery;
the angular position of notch 16 corresponds to
the angular position of the underlap zone 1d of 50
drum 5G and that of the projection 13 of cam 12.
The armature 63 is normally mechanically biased
by spring 11 against the periphery of the control
plate 6I. Armature 63 accordingly engages the
notch 15 of control plate 6I and holds it against 55
rotation. By preventing the rotation of control
plate 5I, the angular or phase correcting mecha
nism 55 is actuated to effect >the phase synchro
vnism of drum 50 with transmitter drum I4 in a
manner to be described in detail hereinafter.
60
The anode potential source61 for the push
pull amplifier stage 35-36 is supplied to the
center tap 68 of the primary 38 through the syn
By rotating drum 5G at a slightly faster rate
than the transmitter drum I4, for example in
the ratio of 101:100, the underlap period of the
drum 5@ will reach the predetermined position
corresponding to the engagement of armature 63 65
of notch 15 slightly before the normal reception
of the synchronizing signal from the transmitter.
chronizing cam switch 1li-1I. A cam 12 is con
The cam 12 will accordingdy open cam switch
forth. A‘direct current potential source 6d sup
plies the synchronizing magnet 52 through its
relay contacts 65-65.
ß.
nected to the shaft 60 adjacent the drum 50.
1li-1I by the projection 13 and permit the ener
The projection 'I3 of the cam 12 is in the same
70
angular position on shaft 60 as the underlap or
“dead” zone 14 of the drum 50. The cam switch
gization of synchronizing relay 15 by lthe syn
1li-1I is normally maintained closed during the
ymajor-portion of the rotation of cam 12, and the
75 anode current from source 61 normally directly
chronizing impulse as it is received.
The ener
gization of synchronizing relay 15 by the syn
chronizing impulse will close relay> 65-156 to
correspondingly energize the synchronizing mag
net 62 to attract the armature 63 away from en
70
4
2,108,983
gagement with notch 16 of control plate 6i. The
positive driving connection between the motor
54 and the drum 56 is continuously maintained
and the synchronizing signal in attracting the
armature 63 from the control plate 6| permits
the drum 99 to continue rotating with the posi
10
worm gear 91 and shaft 60 to the drum 59. Worm
96 does not rotate during its normal interlocking
with worm gear 91. The control plate 6|, free
to rotate on shaft 60, is freely turned thereon due
to the interlocking of the skew bevel gears |90
and itil.
`
'
tive driving connection intact and in accurate
phase synchronous relation with the transmitter
The armature 63 is normally biased by spring
11 against the periphery of control plate 6I.
drum.
When armature 63 engages with notch 16 the
normal rotation (indicated counterclockwise) of~ 10
Figure 3 is a plan view of a preferred embodi-I
ment of a telepicture receiver utilizing the phas
control plate 6| is arrested.
ing or angular correcting mechanism 55 herein
above described. The apparatus is mounted
mally biased against control plate 6| by spring
A pawl |03 is nor
G99 to co-act with a notch |95 on control plate
6l at the instant armature 63 engages notch 16
in order to prevent rebound of the control plate 15
6l to insure immediate stoppage thereof.
When control plate 6| is stopped from its free
drives a reduction gear train 8i to rotate, at a ~
predetermined reduced ratio, the spur gear 92 rotation on shaft 69, pinion |9| is moved relative »
to the stationary teeth of the skew bevel gear |60
which is connected to one end of the worm or
20 scanner feed screw 83. The worm 93 is connected
since the interlocking action of worm 96 and
to the carriage 84 containing the electrooptical worm gear 91 forces it to execute this relative
scanning mechanism electrically connected to motion. The relative movement of the pinion
iti on skew gear H99 causes pinion Ill! to rotate.
the receiver equipment by cable 85. Carriage 99
is moved parallel' to the wis of drum 59 along Since worm shaft 95 is originally attached to
pinion itil, the worm 96 will correspondingly
25 tracks ‘t6-81' guiding rollers 88 of carriage 99.
Details of the scanning arrangement are described rotate therewith. Rotation of 'pinion |9| as
in my co-pending application Serial No. 65,869 illustrated in Figure 5, will be clockwise as indi
cated by the arrow on the dotted position there
referred to above.
‘
The focusing system 42’ for the recording light' of. The dotted position of pinion lill and worm
30 beam 42 corresponds to the optical recording sys
96 corresponds to the continued rotation of the 30
tem described in connection with Figure 2 to worm 96 and pinion |91! from the solid position.A
translate the receiving telepicture .signals upon Clockwise rotation of worm 96 is _designed to
the sensitive recording sheet 49 fastened on drum superimpose upon worm gear 91 a motion oppo
upon a cast iron base 18. The motor 59 drives
drum 59 through the mechanism 55 by worm 58.
A pinion 99 connected to the end of shaft 69
50. The record sheet 49 is attached to the drum
50 by internal clamping mechanism such as dis
closed in my application Serial No. 72,990, filed
40
site to its normal rotation..
Accordingly, since the normal rotation of worm
gear 9i and its shaft 69 is counterclockwise, the
April 6, 1936, operated by levers 99. Roller 9| is
superimposed rotation by worm 96 is made clock
pressed upon drum 59 to facilitate mounting of
the record sheet 49 thereon by continuously
wise.
smoothly pressing against the sheet.
Figure 4 is the cross sectional View taken
along él--fl of Figure 3 through the phase cor
recting mechanism 55. The shaft 5t of motor
54 drives worm 58 which rotates worm gear 59
The phasing or angular correction of the
synchronizing mechanism of my present inven- „
tion superimposes upon the normal rotation of 40
the driven member a counter-rotationv while
maintaining a positive driving connection to the
driven member. The ratio and proportions of
the skew gears £99 and i0! and worm 96 and
45 keyed to shaft 56 which is journalled in bracket
worm gear 91 are preferably chosen so that when 45
92. A sleeve 93 is keyed to the end of shaft 56.
A bracket 99 extends from sleeve 93 to rotatably
support shaft 95 of worm wheel 96. Worm 96
coacts with worm gear 91 which in turn is keyed
50 to one end of shaft 60. Shaft 69 is journalled in
bracket 98 and also in bracket 99 at the opposite
end of drum 59. Drum 59 is also keyed to the
sla;v 69. The synchronizing cam 12 is attached
to the hub of drum 59. The synchronizing switch
55 't0-1i is attached to the top of bracket 99 to
coact with the cam' 12.
The worm Wheel 96 and worm gear 91 normally
the rotation of stop plate 6i isi arrested, the
counter-rotation superimposed upon driven shaft
@il is equal to the normal speed of rotation there
of but in the opposite direction. An effective
stand-still of the shaft 60 is effected by the 50
mechanism 55.
-
‘
.
Although in my preferred embodiment a coun
ter-rotation at a rate equal to the normal rotation
is used to effect the phasing or angular correction
. I interlock to transmit the rotary motion of shaft
of the drum 59 with respect to the transmitter 5,5
drum in response to synchronizing signals, it is
to be understood that it is by-way of example and
not limitation. The principle of my present in
56 to shaft 69 inl a one-to-one or continuous
60 manner. Figure 5 illustrates the interlocking of
worm 96 and worm gear 91. The control plate
vention is also applicable to systems employing
intermediate speeds of superimposed correction 60
movement either in the counter-direction to the
6| is loosely mounted upon shaft 60 between worm
gear 91 and bracket 98. A skew bevel gear |99 is
integral with control plate 6| and coacts with a
skew bevel pinion I 0| attached to one end of
the shaft 95 of worm 96.1 A housing §92 is at
tached to the outer edge of the control plate 6|.
The normal interlocking of worm 96 and worm
gear- 91 causes the control plate 6I to‘rotate in
70 correspondence with the normal rotation of shafts
normal rotation or in the normal direction of
rotation.J
When control plate 6| is stopped by the arma
56 and 60, through the normal interlocking of
skew bevel gear |00 and its co-acting pinion |0i.
A positive driving connection is effected from mo
tor shaft 51 through worm 58, worm gear 59,y
75 shaft 60, sleeve 93, worm 96 interlocking with
ture 63, normally mechanically biased toward it,
the shaft 69 of the drum 50 is affected by the
action of the phasing mechanism 55. Since the
receiver drum is preferably normally rotated at a
slightly faster rate than the transmitter drum, armature 63 will engage notch 16 of control plate 70
6| `lust before the incoming synchronizing signal
causes the energization of the synchronizing mag
net 62. when synchronizing magnet 62 is en
ergized by the synchronizing signal,‘the engage
ment of the control plate 6| with armature 6_3 75
2,108,983
is released, permitting the drum 50 to continue
rotating in phase synchronous relation with the
transmitter drum.
"
The synchronizing signal being transmitted
during the underlap period as _described in con
nection with Figure 1 marks the corresponding
underlap position of the receiver drum which in
turn corresponds to the position of notch 'i6 on
control plate 6|.
'
Figure 6 is a modification of the embodiment as
illustrated in Figure 5 by employing two opposed
worm wheels 96 and 96' coacting with the worm
gear 91 upon a common bracket 94'.
The corre
sponding skew bevel pinions |0| and |0|’ coact
15 with the common skew bevel gear |00 integral
with control plate 6|. The action, of _the two op
posed worm Wheels 96--96' together with their
corresponding pinions |00 and |0| is additive in
that they impose a common direction of motion
20 upon worm gear 9`| when angular correction is
eiîected. The opposed worm and pinion arrange
ment is preferable from the standpoint of dynamic
balancing about the axis of rotation. The con
trol plate 6| and skew bevel gear- |00, integral
25 therewith, is~preferably made of a light weight al
loy to minimize the eiîect' of residual inertia in the
' operation of the control mechanism for the phase
adjusting device 55.
,
Figure 7 is a longitudinal cross-sectional view
30 through another embodiment of the angular cor
recting me
nism 55’ corresponding to the mech
anism 55 d scribed hereinabove. Shaft 5l' con
nected to a suitable motor, drives worm 58’ which
engages with worm gear 59'. The worm gear 59'
35 is keyed to sleeve 56’ concentric with control
shaft H0. Sleeve 56’ is journalled in bearing |||
extending from the housing ||2 of mechanism 55'
and integral with housing H3 enclosing worm
40
gear 59’ and worm 57?..
Bracket member Hd extends from sleeve 50'
and rotatably supports shaft H5 of worm wheel
| i6. Worm | I6 meshes with worm gear | il which
is keyed to shaft 60'. The telepicture drum 90 is
keyed to shaft 60’ to rotate therewith. Sleeve
45 | |8 is concentric with shaft 60' and is journalied
in bearing |20 extending from housing | i2. Sleeve
Hi8 is integral with the bracket member ||é| and
supports the right end thereof.
A positive 'driving connection is maintained
from the shaft 5l' of the motor to the telepicture
drum 50 as follows: Worm 58', worm gear 59',
>
5
control plate 6|’to the bevel gear |20. A bevel `
gear |2| supported on rod |22 journalled in brack
et member Hd meshes with the bevel gear |20.
A spur gear |23 is external to the bracket member
H0. Gear |23 meshes with gear |24 which is
connected to the shaft | l5 which supports the
Worm H6. Figure 9 is the sectional view taken
through Figure 7 along 9_9 and further illus
trates the intermeshing gears connecting the con
trol plate 0|' to the worm || 6.
'
'
parted to bracket member iM to the worm gear
||`| to effect a- link in the positive driving con
nection between the motor and the picture drum 15
50. Worm H6 does not normally rotate with its
shaft H5 and is carried in a path concentric with
the worm gear ||l with which it interlocks as
bracket member ||Q rotates. The spur gears |23
and |20 accordingly do not normally rotate but 20
are also carried in a circular path as is the worm
HS. The bevel gears |20 and |2| normally mesh
but do not move with respect to each other in a
similar manner. Since bevel gears |20 and |2|
do not normally rotate with respect to each other 25
„ and since bevel gear |2| is moved in a path con
centric to the axis of bevel gear |20, the gear |20
will be forced to rotate while intermeshing with
gear |2|. Control plate 6|' being connected to
bevel gear |20 by‘rod ||0 accordingly normally 30
rotates during the rotation of the drum 50.
-
It is to be understood that during the normal
operation of the drum 50 from the motor shaft
5l', a positive driving connection is maintained
therebetween, that worm H6 does not rotate on 35
its axis but is carried in a path concentric to
the axis of the drum shaft 60’ and that bevel
gear |2| also does not rotate on its axis but forces
bevel gear |20 to rotate to correspondingly re
Volve control plate 0|'. The normal rotation of 40
rod i i0 by the intermeshing gearing system of~
mechanism 55’ is at the same speed and direction
as the rotation of sleeve 56’ encircling the rod
H0. The rod H0 accordingly revolves together
with the sleeve 56' with zero relative speed there
between.
'
Figure l0 is an end view of the apparatus illus
trated in Figure '7 showing the arrangement of
the control plate 6|', the synchronizing magnet
62 and the armature t3 coacting with a notch 50
'I6' in the control plate periphery. Spring 'il'
normally mechanically biases armature 69 to
ward the control disk 6|'. Pawl |03' coacts with
locking of worm ||6 with worm gear H7 corre
its notch 'i6' is arrested by armature 63.
bodiment illustrated in Figures 4 to 6.
-
The phasing or angular adjusting means of
drum 50 with respect to the motor shaft 5l' is
eñected by rotating worm ||6 to superimpose a
counter-rotation upon gear lil. The control
.plate 6|' is situated external to the mechanism
55’ and is connected thereto by the shaft ||0
which is free to rotate relative to sleeve 5S'. The
control plate 0| ' is affected by the synchronizing
magnet 62 and the synchronizing signals in a
manner similar to the hereinabove described con
trol plate Si. However, in the embodiment de
scribed in connection with Figures '7 to 10, the
control plate is external to the mechanism 55'
and is connected to the phasing worm wheel H6
by a series of gearing connections in the follow
ing manner:
Referring to Figure 8, the rod || 0 rotatably
supported within sleeve 56’ directly connects the
45
fi
sleeve 60', bracket member ||l|, worm H6 sup
ported by bracket I It and interlocking with worm.
gear H1 which is keyed to shaft 60'. The inter
sponds to the similar portion of the previous em
10
Worm H6 normally interlocking with Worm
gear ||î transmits the- motive power directly im
plate 6|’ to prevent rebound of the plate when
`
55
A counter-weight |25 is preferably cast integral
with bracket member | i0 to dynamically balance
the gearing mechanism connected to the opposite
side of the> bracket member Hd.
ll‘he operation of the phasing or angular cor 60
rection mechanism 55' is similar to that de
scribed hereinabove in connection with the modi
ilcation illustrated in Figures 4 to 6. ’I‘he drum
50 is driven by the motor through the motor
shaft 5l' by the~positive driving connection in 65
cluding the worm 58’ and Worm gear 59' which
motivates the synchronizing mechanism 55'. The
drum 50 is preferably driven at a slightly faster
rate""than the corresponding transmitter drum -
so as to insure the engagement of notch 16’ 70
of control disk 6|' with armature 03. When
the rotation of control disk 6|' is arrested, the
rotation ofbevel gear |20 is prevented. Since
bevel gear |2| is turned in a concentric path
about the axis of rotation of the drum 50, the 75
aioaees
6
controlling the rotation of said driven shaft with
out destroying said continuous mechanical inter
connection whereby the angular position of said
and |24 to turn the shaft ||5 of Worm wheel IE6. driven shaft is alterable with respect to said driv
ing shaft; and a synchronizing magnet responsive
The rotation of worm wheel ||6 superimposes a
to cyclic synchronizing signals for arresting the
counter-rotation upon worm gear ||1 to eifect .
the angular correction by the mechanism 55’. rotation of said mechanism in the event said
The ratio and proportions of the respective driven shaft is not in synchronism until rsaid
gearing in the phasing device 55' is designed so driven shaft is in synchronous position, once per
that by arresting the normal rotation of gear revolution of said driven shaft.
3. In a synchronizing system, a driven shaft; a
_|20 the worm ||6 is turned lat a rate and in the
direction to impose a counter-rotation _upon gear driving shaft; a driving connection including gear
ing from said driving shaft to said driven shaft;
||'| at a rate which is equal to its normal rota
tion. The drum 50 will be effectively stopped a stop-plate -mechanically connected to and nor
mally rotated with said driving connection for
15 from rotation and held in the stop position While
independently controlling the rotation of said
rotation of control plate 6| is effected by the syn
driven shaft whereby the angular position of said
chronizing armature 63.
The position of notch ‘I6’ corresponds to the driven shaft is alterable with respect to said driv
underlap portion of the drum 50 in relation to ing shaft; and a synchronizing magnet responsive
gear | 2| will be forced to rotate as it rolls around
the stopped bevel gear |20. Rotation of bevel
gear I2| correspondingly rotates spur gears |23
20 the optical scanning system and also corresponds
to the position of cam 12 connected to the drum
opening the synchronizing switch ‘l0-1| by the
cam projection 13. The synchronizing signal will
cause synchronizing magnet 62 to be energized in
25 a manner already described to attract -armature
63 out of engagement from control disk 6|' and
permit it to continue its normal rotation. The
synchronizing signal accordingly starts the tele
picture driun 50 rotating in proper phase syn-30 chronous relation with respect to the transmit
ter drum as determined by the timing of the
cyclic synchronizing signals.
' In the preferred embodiments of my invention,
the telepicture drum is effectively maintained at
35A a “stand-still” if the drum is not in proper phase
' relation with the transmitter drum. If the drum
is in the exact phase relation with the transmit
ter drum as determined by the timing of the syn
chronizing signals, a positive driving connection
40 is maintained between the driving motor and the
telepicture drum, so that no slippage can be had
therebetween at any time, particularly during the
phasing periods.
’
In accordance with my present invention, phase
synchronism
is effected in a definite and positive
45
manner by superimposing the angular corrective
motion upon the normal motivation of the drum
while maintaining the positive driving connection
to the drum. It willbe evident to those skilled
50 in the art that modifications falling within the
broader spirit and scope of my invention are feas
ible, and I do not intend to be limited except as
set forth in the following claims.
to cyclic synchronizing signals for arresting the
Ca
10
15
20
rotation of said stop-plate in the event said driven
shaft is not in synchronism until said driven
shaft returns to synchonous position, one per
revolution of said driven shaft.
4. In a synchronizing system, a driven shaft; a 25
driving shaft; gearing effecting a continuous me
chanical interconnection between said driving and
driven shafts; mechanism mechanically connected
to and normally rotated with said gearing inter
connection for independently control ' g the ro
30
tation of said driven shaft without di onnecting
said gearing whereby the angular position of said
driven shaft is alterable with respect to said driv
ing shaft; and a synchronizing magnet responsive
to received cyclic synchronizing signals for 35
cyclically arresting the rotation of said stop-plate
until said vdriven shaft returns to synchronous
position.
.
5. In va synchronizing system, a driven shaft; a
driving shaft; a driving connection from said 40
driving shaft to said driven shaft comprising gear
ing effecting a continuous mechanical intercon
nection between said driving and driven shafts; a
stop-plate mechanically connected to and nor
mally rotated with said‘gearing interconnection 45
for independently controlling the rotation of said
driven shaft Without disconnecting said continu
ousymechanical interconnection whereby the an
ogular’, position of said driven 'shaft is alterable
with respect to said driving shaft; and a syn
v50
chronizing magnet responsive to cyclic synchro
nizing signals for arresting the rotation of said
stop-plate in the event said driven shaft is not
in
synchronism until said driven shaft returns
Y I claim:
to synchronous position, once per revolution of 55
1.
In
a
synchronizing
system,
a
driven
shaft;
a
l
55
said driven shaft.
driving shaft; gearing effecting a continuous me
chanical interconnection between said driving and
driven shafts; mechanism mechanically connect
ed to and normally rotated with said gearing
60 interconnection for independently controlling the
rotation of said driven-shaft without interrupting
said continuous mechanical interconnection; and
a synchronizing magnet responsive to cyclic syn.
chronizing signals for cyclically arresting the ro
65 tation of said mechanism in the event said driven
shaft is not in synchronism and until said driven
shaft is in synchronous position.
2. In a synchronizing system, a driven shaft; a
driving shaft; comprising gearing effecting a con
70 tinuous mechanical interconnection >between said
driving and driven shafts; mechanism mechani
cally connected to and normally rotated with
said gearing interconnection for independently
6. In a synchronizing system, a driven shaft; a ,
driving shaft; a driving connection including
gearing from said driving shaft to said driven
shaft; a stop-plate mechanically connected to and 60
normally rotated with said gearing connection
for independently controlling the rotationv of said
driven shaft without disconnecting said gearing
connection whereby the angular position of said
driven shaft is alterable with respect to said driv .65
ing shaft; and a synchronizing magnet responsive
to cyclic synchronizing signals for arresting the
rotation of said stop-plate in the event said driven
shaft is not in synchronism, to effect a substan
tial stand-still of said driven shaft until said
driven shaft returns to synchronous'r position,
once per revolution of said driven shaft.
WILLIAM G. H. FINCH.
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