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Патент USA US2127448

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Aug. 16, 1938.
2,127,448
C. P. MITCHELL
ELECTRICAL REPRODUC ING DEVICE
Filed Feb. 12, 1937
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INVENTOR.
BY
WW1 K
ATTORNEY-9
2,127,448
Patented Aug. 16, 1938
UNITED STATES PATENT OFFICE,
2,127,448
.
ELECTRICAL REPRODUCING DEVICE
Curtis P. Mitchell, Springdale, Ohio, assignor to
The Palmer Company, Cincinnati, Ohio, a cor
poration of Ohio
Application February 12, 1937, Serial No. 125,384
5 Claims.
This invention relates to electrical apparatus
and is particularly directed to an apparatus? for
electricallyreproducing motion at a location dif
ferent from the location at which it is applied.
(Cl. 172-239)
portions of the apparatus, particularly in the
More speci?cally, the invention is utilized as an
electrically operated system for reproducing,
recording, or showing temperatures at points re
moved from the environment, the temperature of
which is being determined. The present inven
tion may be considered in relationship to my
10
previously issued Patent #2,036,091 issued March
31, 1936, disclosing and claiming'an electrical re
producing device for the same general purposes
event that the receiving portion of the apparatus
becomes inoperative or acts too rapidly or too
slowly.
'
Other objects and certain advantages will be 01
more fully apparent from a description of the
accompanying drawing, in which:
apparatus or system for electrically reproducing
The ?gure of the drawing is a diagram illus
-trating the electrical and mechanical elements
of the apparatus and system and disclosing the
electrical connections therebetween.
In the disclosed embodiment of the invention
set forth in the above mentioned patent, a series
wound commutator type of motor is used. Re
versal is accomplished by splitting the field wind
ing into two parts and making the connections so
thermostatically detected temperature changes
that each ?eld serves for one direction of rotation.
by means of a unit placed at the environment of
temperature change which may be a theatre, an
20 oven, etc., and connected by electrical means to
a receiving unit which may be located at a remote
point such as the outside of the theatre or the
recording room of a bakery or any extremely
The transmitter and receiver portions of the
apparatus are kept in synchronism by arranging
and uses as that herein disclosed.
ll
It is an object of this invention to provide an
remote point. The receiving apparatus receives
signals from the sending device by electrical con
trol and converts them into mechanical move
ment which is e?ective {or temperature record
or display purposes.
It is a further object of this invention to pro
vide apparatus of this character which is ex
tremely sensitive and which, therefore, transmits
the very slightest change in temperature and
immediately displays or records the change sub
stantially simultaneously with the occurrence
35 thereof. Moreover, it is arranged that, in the
event of power failure, these devices will operate
automatically when the power is restored for
quickly and accurately reproducing the temper
ature reading existing at the time of power restor
ation without requiring manual resetting of the
apparatus.
It is a more general object of this invention to
provide a system and apparatus for electrically
the circuit so that, as the transmitter advances 20
one step, the voltage in the transmitter is reduced
to a point insu?lcient for its operation by the
operation of the receiver, and cannot proceed
until the receiver has advanced one step.
The present invention employs small shaded
pole induction type motors which have the ad
vantage that they run at uniform speeds. The
previous system of synchronizing control is not
adapted to the induction type motor since the
induction motor is more independent of line volt
age. Accordingly, a different system of control
and meansv of synchronizing has been adopted
' herein.
In order to secure reversal of motion, two in
duction motors are coupled together and wired to
rotate in opposite directions so that energization
of the winding of one motor makes it run car
rying the other with it, or vice versa. The syn
chronizing means consists essentially 01' a ro
tating contact switch, mounted on the same shaft
as the transmitting contact switch, and a similar
switch mounted on the same shaft as the receiv
ing contact switch. These switches are connected
in such ?a way (as will be hereinafter explained
reproducing relative movement at a location re
in detail) that if the receiving portion of the i
45 mote from the location at which the motion is '
created and, further, to include the provision of
means for e?ecting the aforesaid electrically re
produced movement in reverse directions as de
termined by the direction of movement at the
50 source or initially.
It is a still further object of the present inven
tion to provide a system and apparatus of the
above character in which synchronizing means is
incorporated for maintaining a true operative
55 relationship between the sending and receiving
apparatus fails to keep up with, or gets ahead of,
the transmitting portion, or does not operate for
some reason, the ?eld winding of both motors
on the transmitter will be energized at the same
time. Since they are wired to run in opposite
directions, the transmitter will stop instantly
when this occurs. When, and if, the receiving
end reaches the proper position, the normal con
nections are restored on the transmitting motors
for operation in one or the other direction.
2
2,127,448
Referring to the drawing, the sending or trans
mitting unit is generally indicated at A, and the
receiving unit at B. The disclosed embodiment
of the invention is arranged for recording tem
peratures at a point away from the environment,
the temperature of which is being determined.
For example, the sending or transmitting unit
may be located in the interior of a theatre and
the receiving unit-at the exterior of the theatre,
for disclosing to the public the temperature with
in the theatre. As another example, the sending,
or transmitting, unitimay be in an even of a
bakery with the recording or receiving unit lo
cated in an executive's or manager's office, or in
15 a control room, particularly where the bakery is
a large institution.
'
tor arm 44. This arm 4| carries a recording in
strumentality such as a pen or pencil for, draw~
ing a graph line on a record strip 45, being un
reeled from a roll 46, rotating at a uniform rate
and driven by some means (not shown) and sup
ported in bearings 41, 41. Shaft 42 also carries
two rotating diametrically opposite contact arms
45, 55, respectively connected to the field wind
ings of the motors 4U and-4i bylcads 50, H.
A supply lead 52 completes the circuits to the 10
respective motors 20, 2|, l5, and ii.
The rotating contact arms?, 49 successively
contact segments 53, 54, 55 and 55. These arms
l5, l5, and their contacts constitute the receiv
ing switch. Another'rotating contact arm 51, is 15
fixed to the shaft 42 and successively contacts
switch segments 58, 55, 60, and ii. The arm 51
The thermally sensitive or responsive element?
of the sending unit is generally indicated at l0. ,_ and its contacts constitute the receiving switch
As illustrated, it consists of abutting strips of ?of the synchronizing system. Corresponding sta
metal having different coefiicients of expansion
tionary contacts of the respective switches, that
causing swinains of the strip upon the occurrence is, the sending and receivingof the normal sys 20
of expansion or contraction. It may, however,
tem and the sending and receiving of the syn
consist of a Bourdon tube iilled with an expan
sible liquid and carrying an arm which swings
back and forth ?as the tube coils and uncoils due
to temperature changes effecting the expansible
liquid, as disclosed in the patent heretofore men
tioned.
-
As illustrated, the swinging arm III has one end
anchored, as at Ii. Its swinging end carries a
double contact i2 swinging between contacts l3
and II. The contacts I! and M are in i?lxel1
spaced relationship and are mounted on a car
rier block II. The carrier block 05 consists .of
a nut i5 and arms II and II projecting laterally
from the nut, and carries the respective spaced
contacts II, II.
The thermally sensitive arm II is connected to
a source of electrical current through a lead It.
The contacts II and II are connected to the re
spective iield windings of induction motors 2|, 2|,
by leads 22, 22. The motors 25 and 2| may be
a single unit consisting of field windings wired to
run in opposite directions.
A screw threaded
shaft 24 is driven by said motors through reduc
tion gearing, as in the issued patent. Bearings
25 are shown diagrammatically for rotatively
mounting said shaft. The nut I. of the travel
ing block II is ?traversed by the screw threaded
portion of the shaft whereby, upon rotation of
the shaft, the block will be moved changing the
position of the contacts I: and II with respect
to the thermally sensitive member ID.
- chronizing system, are connected by electrical
leads 62.
_
?The contact arms 3i and 51 of the respective
sending and receiving switches of the synchro~
nizing system are normally out of step 180�. In
other words they engage diametrically, opposite
contacts of the respective synchronizing switches.
Moving contact 51 is connected to the contact ii
of the thermally controlled motor control switch
by a lead 55 and moving contact 3| is connected
to the other contact I? of the thermally con
trolled switch by a lead 66. Thus it is arranged
that ii? the contacts 2| and 51 get into step, both
of the sending motors are then in circuit and the
respective fields buck each other which results in
looking the coupled reversely wound motors
against movement in either direction.
Operation
For illustrative purposes, the drawing discloses
the system in one of the positions it assumes
when at normal rest. As shown, the contact l2
of the thermally sensitive element is out? of con
tact with either contact I! or ll. Now when 45
there is a temperature change in the environ
ment of? the sending apparatus, which may be
(for the sake of illustration) 9. drop in tempera
ture, it may be assumed that the element Ill
swings the contact l2 to the right, engaging the
contact I 3. The current then flows through the
field of the motor 20 by way of supply line It,
The shaft 24 carries a rotating contact arm 25
making successive contacts with switch segments
or poles 21, 2|, 25, and II. This arm 26 and its
contacts constitute the sending switch. The
contact l2, contact l2, lead 22, the motor wind
ing, and supply line 52. This rotates the shaft
24 and tends to move the contact I3 away from
the swinging contact I2 until a break is accom
shaft 24 also carries a second contact arm 2|,
adapted to make successive contact with switch
segments or poles 22, 82, II, and 35. The arm
ceases.
II
of
II
of
and its contacts constitute the sending switch
the synchronizing system. The contact arm
is of such circumferential dimension, or width
contact portion, that with either direction of
rotation in passing from one segment or pole to
another, it will always reach a new contact seg
ment or pole before the arm 25 reaches a new
contact segment, or pole.
_
Referring to the receiving or recording unit,
70 the receiving motors are indicated at 40 and ll.
These motors II and II are also induction motors
having their respective field windings wired to run
in oppodte directions. The motor shaft 42 of
the receiving or recording unit is provided with
a screw threaded section 43, traversing an indica
plished; that is until the drop in temperature
Rotation of the shaft 24 by- the motor 20 moves
the switch arm 25 of the sending switch from
contact 28 to contact 28. The current then flows
from supply line I! through arm 26, contact 29,
lead 52, contact arm 49, lead 5|, the winding of
induction motor ii, and supply line 52: This ro~
tates the shaft 42 for moving the recording arm
45 in the appropriate direction to indicate the
drop in temperature on the recordingsheet.
As soon as the shaft 45 is in rotation, the con
tact 45 moves from contact 55 to contact 58 70
which is connected to contact 30 of the sending
switch previously dead but now in circuit by
virtue of the continued rotation of contact 26 '
from contact 25 to contact 25.
If the drop in
temperature continues, the induction motor 2|
3 .
2,127,448
will continue to run and successive driving im
pulses will be sent through to the receiver until
the contact i3 breaks contact with the swinging
contact l2.
3
?
The reverse direction of rotation occurs in the
event of a temperature rise, the induction motor
2| then being placed in circuit by way of supply
contact 33, connect the supply to contact 59 of
the receiving synchronizing switch and will there
upon, ii! the arm 51 has not moved in a normal
manner,.connect through it and-lead 65 to the
win
?of the induction motor 20 and supply
line 52. This results in energizing both motors
line l9, contact |2, contact ll, lead 23, the wind
and?results in stoppage of the transmission for
the same purpose as in the opposite direction
ing of the motor, and supply lead 52.
previously described.
In this
'10 event, since the shaft 24 is then reversely driven,
contact 26 moves to contact 21, the current then
?owing from supply line I! to contact 21, lead
_
It is arranged that the system must keep in 10
step or the coupled induction motors of the send
ingunit will buck each other and result in a
62, contact 53 of the receiving switch, contact stoppage of-the sending impulses.
arm 48, lead 56, winding 01' the reverse motor 40,
and supply line 52. Then the recording arm 64
moves in the opposite direction to record a tem
perature rise on the recording sheet.
Synchronization
The above description of the operation outlines
the normal operating sequence of the system.
such as continues when the receiving unit keeps
in step with the sending unit. It will be noted
that the synchronizing switches do not enter into
the operation or control of the system as long as
the system remains synchronized. In other
words, the ?synchronizing switches ?are supple
mental or secondary devices effective in the cir
. ,cuit only in the event of sluggishness or failure o!
?some sort in the receiving apparatus.
To illustrate the operation of the synchroniz
ing switches, it will be presumed that for some
reason the receiving unit becomes inoperative due
to the failure of the receiving mechanism or the
connections thereto. In this case it is highly
desirable also to have the transmitter stop,
rather than run ahead of the receiver.
When the contact arm 26 moves from contact
28 to contact 29 the contact arm 3| of the send?
ing synchronizing switch moves from contact. 35
4 (l
to contact 32. In fact due to its width, it estab
lished this contact with contact 32 before the
establishment of contact of arm 26 with contact
29. Assuming the receiver to be inoperative, the
contact arm 51 of its synchronizing switch will
45
remain stationary. Now the arm 26 will continue
to move along contact 29 while the contact 3|
will continue to move along contact 32 until the
Having described my invention, I claim:
1. In a reversible motion transmitting and' syn
15
chronizing apparatus, a pair of induction motors
wound for reverse direction of rotation respec
tively, a pole switch driven by said motors con
trolling a plurality oi? controlling circuits, a sec
ond electric motor driven switch, the correspond 20
ing poles of said motor driven switches ?respec
tively in circuit connection, a pilot switch alter
nately cooperable with oppositely arranged con
tact elements of said induction motors, a synchro
nizing switch driven by said induction motors, a
second synchronizing switch in driving connec
tion with said second motor? driven switch, said
synchronizing switches respectively wired for
completing the circuit to either one or the other
of said induction motors and having their con 30
tacts related for energizing the ?eld of the in
duction motor which is not in operation at the
particular time in the event that the second motor
driven switch mechanism ceases to operate.
2. In a reversible motion transmitting and syn 35
chronizing apparatus, a tour pole sending switch,
induction sending motors for operating said four
pole sending switch, one for each direction of
movement, a control switch for controlling said
motors, said control switch operated by said 40
motors when the motors are in motion for auto
matically breaking contact, a tour pole receiving
switch, induction receiving motors controlled by
and actuating said four pole receiving switch,
the corresponding poles of the sending and re 45
ceiving switches electrically connected, said re
ceiving motors wound for reverse directions of
movement, means driven by said receiving mo
forward extremity of the arm 3| engages con
tact 33. Since contact 33 is connected to con
tors, said four pole receiving switch including di
ametrically opposite contact arms, each electri
tact 59, upon which the synchronizing contact
arm 51 is resting, this will result in placing the
other motor 2| in circuit by way of supply line
52, winding of the motor, lead 66, arm 3|, con
tact 33, lead 62, contact 59, arm 51, lead 65, con
tact i3, contact 12, and supply lead i9. Thus the
windings of the respective induction motors are
ceiving motor, and a synchronizing device, in
cluding a switch actuated by the sending motors
and a switch actuated by the receiving motors,
said latter switches including four poles electri 55
cally connected, said latter poles corresponding
to those of the sending and receiving switches,
inoperative until the receiving end steps up to its
proper position and throws the winding 2| out of
circuit.
If the receiver is merely slow in acting, it may
stop the transmitter, as described above, but,
both sending motors in circuit when moving con
tacts of the respective synchronizing switches are
in step or engaging corresponding contacts.
3. In a reversible motion transmitting and syn 65
cally connected for controlling a respective re
50
both in circuit or in a bucking or balanced con - said synchronizing switches having their moving
contact arms normally substantially 180� out of
_ dition, and the shaft 24 will then remain sta
step and each connected to a respective direc 60
tionary.
Thus
the
transmitting
end
will
remain
(10
tional contact of the control switch for placing
since it ?nally moves arm 49 from contact 55 to
contact 56, and arm 51 from contact 59 to con
tact 60, the circuit through to contact 33 and
arm 51 will be broken,.de-energizing induction
motor 2| whereupon induction motor 20 may
continue to run.
'
'
In the event that motor 2| was transmitting a
temperature rise and the contact 3| of the syn
chronizing sending switch was moving in a re
75 verse direction, it will, upon engagement with
chronizing apparatus, a sending switch, induction
sending motors for operating said sending switch,
one for each direction of movement, a switch for
controlling said motors, a receiving switch, in
duction receiving motors controlled by and ac~ 70
tuating said receiving switch, said receiving mo
tors wound for reverse directions of movement,
means driven by said receiving motors, said re
ceiving switch including a pair of contact arms,
each electrically connected for controlling a re
75
4
2,127,440
?spective receiving motor, and a synchronizing de
vice including a switch actuated by the sending
motors and a switch actuated by the receiving
motors, said switches electrically connected in
111s circuit to the sending motors so as to place
both sending motors in circuit upon the feline of
the receiving motors to operate thereby causing
said motors to buck each other and to remain
stationary.
4. A reversible motion transmitting and syn
chronising apparatus comprising induction mo
tors having reversely wound fields, a pole switch
driven by said motors, a pilot switch for ener
sizing and tie-energizing the induction motors
alternately, a second pole switch-said first men
tioned pole switch and said second pole switch
having their respective corresponding poles con
nected electrically, receiving motors controlled
by said second pole switch, said motors having
oppositely wound fields and said pole switch in
eluding a control arm for each held, means driven
by said receiving motors and a switch control
ling electrical circuit for maintaining said pole
switches in synchronism, including switches
driven by the respective sets of motors having
their contacts electrically connected to the re
spective induction motors but normally out of
circuit, said synchronizing switches adapted to
place that motor in circuit which is not operating
when the pilot switch is in connection for caus
ing the respective motors to buck each other
when the receiving motors and apparatus fails to
function.
5. A reversible motion transmitting and syn
chronizing apparatus comprising an electrically
braked reversible motor driven shaft, a- pole switch
driven by said shaft, a pilot switch for energis
ing and de-enei?gizing the motor, a second pole
switch, said ?rst mentioned pole switch and said
second pole switch having their respective corre
sponding poles connected electrically, a receiving
reversible motor driven shaft controlled by said
second pole switch, and said pole switch includ~
ing a control arm for each direction of motion
means driven by said receiving motor shaft and a
switch controlling electrical circuit for maintain
ing said pole switches in synchronism, including
switches driven by the respective motor shafts
having their contacts electrically connected to
the reversing contacts of the pilot switch but
normally out of circuit, said synchronizing
switches adapted to place the electrical brake in
circuit for locking the ?rst shaft when the re
ceiving apparatus fails to function.
CURTIS P. MITCHELL.
25
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