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Патент USA US2379548

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July 3, 1945.
‘ 2,379,548
‘ Filed mgrcn'e, 1942
Patented July 3, 1945
2,379,548 '
Edmund M. ‘Squire, Babylon, N. Y.
Application March 9,1942, Serial No. 433,911
'1 Claims. (Cl. 179-4002)
The object of my invention is to provide a
suitable coin-operated mechanism for the con
trol of a magnetic voice recording machine to the
end that the machine may be located in a public
place and serve as an amusement device, or as
I4 and contact arm II is forced into engagement
‘ with contact I0.
Ampli?er 25 may be of any desired construc
tipn. It must be adapted to amplify currents
within the frequency range of the human voice,
and preferably the wider frequency range of mu.
sical instruments.
'A further object of my invention is to provide
Ampli?er 25 is provided with input terminals
means for. delaying operation of the machine
I8 and I9, and output terminals 20 and 2|. Ter
until the cathodes of the electronic tubes in the
ampli?er of the magnetic recording machine have 10 minals 23 and 24 are for the alternating current ,
power supply to the ampli?er. Terminal 2I is
reached their proper operating temperature, thus
grounded to the ampli?er chassis and terminal 22
. avoiding the cost of energizing the ampli?er while
is internally connected to supply direct current
the machine is idle.
from the recti?er within the ampli?er for use as
A further object of my invention is to provide
a control permitting the previous recording‘ to 15 hereinafter described. To draw current from the
internal recti?er, an external circuit is established,
be twice repeated, at the option of the user, so
between terminals 22 and 2|.
that a particularly pleasing recording may be re
In changing from recording to reproduction, the
input and output circuits of ampli?er 25 are
It is to be .understood that magnetic tape re
cording devices are well known, and that the 20 switched substantially simultaneously by relays
26 and 21 respectively, whose operating windings
magnetic recording device itself- is not a part of
34 and 35 are connected in multiple. When ener
my invention.
gized, the coils of these relays are supplied with
I attain these objects by the electrical mecha
direct current by the internal recti?er of the am
nism illustrated in the accompanying drawing,
25 pli?er in order to avoid electrostatic shielding
problems with respect to the ampli?er input cir
Figure 1 is a schematic circuit drawing of the‘
cuit which would otherwise arise if the windings
entire machine;
were energized by alternating current. Of
Figure 2 is a detail showing the arrangement
a device for rehearsing speech or music.
' of electrical contacts which are controlled by the
magnetic tape.
Similar numerals refer to
throughout the several ?gures.
similar parts
A thin steel tape I passes over three long roll
ers 2 and a fourth long driver roller 3.
Roller 3
course, suitably designed and shielded alternating
30 current relays may be used if desired.
A microphone 2B is provided for recording on
the magnetic tape. A loud speaker 30 is provided
for reproducing the recorded sounds. The output
level of loudspeaker 30 is adjustable by volume
is driven by belt 4 which connects it to electric 35 control 29.
In order to permit the use oi.‘ low voltage in
motor 5. Tape I is endless and is looped around
sulation on as much of the control apparatus as '
the four long ‘rollers 2 and 3 many times, cross
possible and particularly to permit the use of
ing over‘at rollers 6 and 6'. When the machine
low voltage wiring for conductors 36 to 44 in
is‘ in operation the entire length of the tape I 40 clusion, a transformer 3| is provided, having a
will pass under the magnetic heads ‘I, 8, and 9
primary winding 32 adapted for energization by
and this will continue repeatedly asylong as the
the commercial alternating current supply, and
motor 5 continues to drive roller 3.
a secondary winding 33 which delivers a low volt
Contacts I 0 and II are disposed on the ma
age, preferably about 24 volts, for the operation
chine in any convenient manner and arranged to 45 of the various portions of control apparatus.
be controlled by a notch I4 in‘ ‘tape I. This is
It is to be noted that the two sections of Figure
best illustrated in Figure 2. A roller I3 is pro
I 1 connected by the dotted portions of conductors
vided with a circumferential slot which engages '
36 to 44 inclusive comprise the magnetic tape ma
and guides one ed e'of tape I. Roller I3 is se- , chine in one part and the coin control apparatus
cured by pivot I6 n the yoke I2 which is secured 50 in the other part. By the use of low voltage in
to contact arm II by electrical insulating ma
this interconnecting wiring, these two portions
terial Il. Roller I 3 is held in yielding engage
‘may be separated by a convenient distance, which
ment with tape I by the action of compression
will permit the more. bulky magnetic recording
spring I5. When notch I4 in tape I‘passes roller
device to be placed in an inconspicuous location
I3, the roller I3 is forced \by/spring I5 into notch, 65 while the coin control mechanism is placed for
convenient access by the public. In this case,
This has the effect of establishing a circuit from
microphone 28 and loudspeaker 36, together with
transformer secondary winding 33 along conduc
volume control 29 should be located near the coin
tors 46, 66, winding 68 of relay 61, conductor 36,
relay contacts 69-16, conductors 1|, 56, 51 and
4|, back to the other side of winding 33. Relay
61 is of the mechanically latched type, being pro
control apparatus.
A coin chute is disposed to receive coins which
will de?ect lever 46 in the course of their passage
along chute 45. Lever 46 is normally held in
yielding engagement with ?xed stop pin 41. by
vided with a contact closing winding or operat
ing winding 68 and a contact opening or tripping
retractile spring 48. When a coin drops in chute
winding 86. ‘An impulse to winding 68 will close
45, contact lever 46 momentarily engages. fixed 10 the contacts and they will remain closed until
winding 86 is energized. Relays of this type are
contact 49, returning thereafter to its original
well known, and it is not important to the oper
position. When the contact 49 is engaged by con
. ation of the circuit herein described what will
tact lever 46, a circuit is established from trans
occur if both windings should be energized simul
former secondary winding 33, along conductors
46, 56, and 5|, relay winding 52 of relay 53, re 15 taneously. It should be noted that winding 68
should be capable of intermittent energization
sistor 54, contact arm 46, contact 49, conductors
without overheating, because as will appear later,
55, 56, 51 and 4| back to the other side of trans
this winding will be energized during the ?rst
former secondary winding 33, This energizes
passage of tape | past magnetic heads 1, 8, and
relay 53, causing it to operate. The resistance
of resistor 54 is as low as possible, but high enough 20 9, and will be deenergized during the second such
so that no injury would result to either contacts
46-49, or contacts I6-I I, if transformer second
ary winding 33 were short-circuited through these
passage. This is not true of winding 86, nor of
windings 88 and 89 of relay 61, because these lat
ter windings receive only momentary impulses.
Energization of Winding 68 causes U-shaped
Operation of relay 52, closes a circuit from 25 contacts 96 to engage stationary contacts 9| and
92 establishing a circuit from power supply con
transformer secondary winding 33 along conduc
contacts, momentarily.
tors 46, 56, 5|, relay winding 52, contacts 58-59,
ductor 93, along conductor 94, closed contacts
92-96-9I and conductor 95 to power supply
terminal 23 of ampli?er 25. The other power
ductors 62, 63, 51 and 4| back to the other side
of transformer secondary winding 33. This 30 supply terminal 24 of ampli?er 25 is permanently
connected to power supply conductor 96 by con
would result in the operation of relay 66, except
ductors 91 and 96. This causes energization of
for the fact that coin contacts 46-49 are still
conductor 65, winding 6| of relay 66, and con- -
closed and a substantial short circuit is main
tained around relay winding 6| via conductorf65,
contacts 58-59, conductor 64, resistor (54, (min
contacts 46-49, and conductors 56, 63, and 62.
The resistance value of resistor 54 should be suf
‘ ampli?er 25.
When the vacuum tube cathodes in ampli?er
35 25 have become heated, a limited amount of di
rect current will be available at terminals 2| and
22 of said ampli?er. The internal arrangements
within the ampli?er 25 are such that terminals 2|
and 22 may be short .circuited without injury to
tions to cause operation of relay 66. As soon as 40 any of the apparatus, by provision of suitable cur
rent limiting resistors within the ampli?er. The
coin contact 46 disengages contact '49, this short
?ciently low so that there will not be su?lcient
voltage drop across it under the preceding condi
current strength is adequate to energize relays 34
and 35 and to energize the obliterating magnetic
head 1. The potential appearing across termi
nals 2| and 22 when the ampli?er has reached its
ductors 46, 56, 5|, winding‘52, contacts 58-59,
operating condition is transmitted from terminal
conductor 65, winding 6 _|, and conductors 62, 63,
2| along conductors 99, I66, and 43 to winding |6I
51 and 4| back to the other side of secondary
of relay I62, and from terminal 22 along conduc
winding 33. Under this condition, it will be
tor 44 and through resistor I63 to the other side
noted that both relays 53 and 66 are now oper
50 of relay winding I6I. The operating character
ated, and their respective armatures attracted.
istics of relay I62 and the value of resistance of
When the machine is idle, lamp 12 is lighted
resistor I63 are so adjusted that relay I62 will not
intermittently in series with flasher button 13.
operate until the cathodes of the vacuum tubes
This is designed to attract the attention of the
within ampli?er 25 have reached their proper
public. Any other device such as a sign or an
operating temperature, and it is also so adjusted
audible signal may be readily substituted for
with respect to relays 26 and 21 so that it oper
lamp 12, and ?asher button 13.. The circuit for
ates substantially simultaneously therewith.
lamp 12, which indicates the idle condition, is es
Upon operation of relay I62, it breaks contacts
tablished from transformer winding 33, along
I65 and I64 and closes contacts I64 and I66.
conductors 46, 56, and 86, closed relay contacts
18-19, conductor 11, closed relay contacts 15-14, 60 This establishes a circuit from transformer sec'-_
ondary winding 33 along conductors 46 and I61,
conductor 82, ?asher button 13, and conductor 6 I.
winding 68 of relay 81, conductor 31, closed con
The circuit is completed along conductors 63, 84,
tacts II 6-I69 of relay I68, conductor II 2, closed
63, 51 and 4| back to the other side of winding 33.
contacts I64-I66 of relay I62, conductor H3,
Opening of contacts 15-14 upon energization of
relay 66, breaks this circuit and extinguishes the 65 and conductor 4| back to the other side of trans
former secondary winding 33. This circuit ener
idle condition indicator lamp 12. It is apparent
gizes relay winding 88, and relay 81 latches in its
that the circuit previously traced will cause
operated position closing its contacts ||4—| I6
standby lamp 85 to be energized by closure of
and ||5-I I1.
contacts 15-16, which accompanies the opening
Closure of contacts II4-I I6 establishes a cir
of contacts 15-14. The purpose of standby lamp 70
cuit from power conductor 93 along conductor 94,
85, is to indicate that the machine is ready to
through closed contacts 92-96-9I of relay 61,
function, as soon as the vacuum tube cathodes of
conductor II6, closed relay contacts II4-II6, ,
ampli?er 25 are heated and ready for operation.
and conductor II9 to motor 5. The other ter
When relay 53 operated upon closure of coin
contacts 46-49, it closed its contacts 69-16. 75 minal of motor 5 is permanently connected to the
circuit path will be'opened, and relay 60 will
operate in series with relay 53, the circuit being
established from secondary winding 33 along con
other side of the power supply via conductors I20,
91, and 96. This causes motor 5 to operate, driv
ing roller 3 and carrying endless magnetic re-'
cording tape I around and over the other rollers.
along conductors 99, I00, 43, I36, closed relay
contacts I31—I36, and conductors I39, I40, and
Thus, it will be seen that tape I does not move
44 back to the direct current'supply terminal 22
of ampli?er 25. This short circuits the direct
current supply, releasing relays 26 and 21 and
until ampli?er 25 is ready for operation, and that
thereafter tape I passes at substantially constant
speed under the magnetic heads 1,9, and 9.
Upon the release of relay 53, a circuit is estab
lished from ground terminal 2| of ampli?er 25
deenergizing obliterating head 1. Reproducing
Upon the operation of relay 81, contacts
head 6 is now connected to ampli?er input termi
I I5—I I 1 were also closed. This established a cir 10 nals I6 and I9. Output terminal 20 is connected
cuit from transformer secondary winding 33,
to volume control 29 and loudspeaker 30, the other
along conductors 40 and I2I, closed relay con
side of the output circuit being ground terminal
tacts II5—II1, conductors 36 and I22,,win-ding
2|, which is permanently connected via conduc
I23 of relay I09, conductor I24, and conductor 4|
tors 99, I00 and MI. The tape I now imparts to
back to the other side of transformer secondary 15 magnetic reproducing head 6 the impulses which
winding 33. This operated relay I09, breaking ‘ it previously received from recording head 9, and
the circuit of contacts I09-—I I0 and closing the
the reproduced sounds issue fromloudspeaker 30
circuit of contacts I09--I I I.
after ampli?cation by ampli?er 25. By provision
of suitable equalizers, a single magnetic head may
secondary winding 33, along conductors 40 and 20 be used for both recording and r production, but
I25 to indicating lamp I26 and continuing-along , separate heads have been indicat d for the pur
conductor I26 to electric time indicator I21. The
pose of simplifying theshowing'of the recording
circuit is completed via conductors I29, I 30, closed
relay contacts III-I09, conductor II2, closed
Tape I will continue again through the ma
relay contacts I06—I04, conductor “3, and con
chine and after substantially all of the pre
ductor M to the other side of transformer sec
viously recorded sounds have been reproduced,
ondary winding 33. Time indicator I21 is an elec
notch I4 in tape I will again pass under roller
tric clock mechanism of the self starting type,
I3, and contacts I0 and I I will again momentarily
A circuit is now established from transformer
having its period for one revolution correspond
ing approximately to the time required for tape I
to travel once through the recording machine.
engage each other.
The machine is now in condition to receive and
record speech or music. Relays 26 and 21 are
energized connecting input terminals I6 and I9
of ampli?er 25 to microphone 26 and the output
terminal 20 to recording magnetic head 9. As
tape I passes under head 9, the variations in mag
netic strength will be retained and‘ will influence
reproducing head 8 at a later time during repro
duction. obliterating head 1 is energized with
steady direct current and removes from tape I
any remnant magnetic in?uences remaining from
the previous recording before the new recording is
impressed upon the tape by recording head 9. In
dicating lamp I26 informs the user of the ma-,
This will send an impulse
from transformer secondary winding 33 along
conductors 40, I3I, tape contacts III-II‘, con
ductor 42, closed relay contacts I33-—I32 of relay
60, and conductors I42, 39 and I45 to tripping or
releasing windings 69 and 86 of relays 01 and 61
respectively. The impulse also is’ carried via; con-i
ductor I43 to electromagnetic counter I44. This
registers one count on counter I44 and trips re
lays 91 and 61 into their normal or released con
_, dition, deenergizing ampli?er 25 and motor 5 and
opening the circuit of coil I23 of relay I06. The
other side of transformer winding 33 is connected
to tripping windings 66 and 69 via conductors 4|
and I46, and to counter I44 via conductor 4|.
This stops the machine and it is then ready to be
used again.
A switch I41 is provided to obtain a reproduc
chine that the machine is in condition for record- ,
ing and time indicator I21 permits the user to
tion of the sounds recorded‘without making a new
adjust his recording interval to terminate at the
end of the recording cycle.
After the tape I has traveled substantially once
through the machine, notch I4 in tape I passes
recording, by eliminating the recording period
from the cycle. When closed, and when the ma~
chine is operating so that relay winding I23 of
relay I06 is energized, the switch I41 will short-.
circuit direct current supply terminals 2| and 22
under roller I3 causing a momentary closure of
contacts II and I0. At the instant of closure, a
of ampli?er 25 via conductors 44, I40, closed relay
contacts I5I-'—|50 of relay I06, conductor I49,
circuit _is established from transformer secondary
winding 33, along conductors -40 and I3I, tape
contacts II-—I0, conductor 42, closed contacts
gigitch I41 and conductors I46, I36, 43, I00, and
I 33——'I34 of relay 60, conductors I35 and 65, closed
contacts 56-—59 of relay 53 and its'wlnding 52,
and conductors 5|, 50 back to conductor 40 again,
short circuiting relay winding 52 and thereby re
leasing relay 5x3. Relay 60 is held operated by the
following circuit: starting from transformer sec
ondary winding 33, conductors 40 and.|3|, tape
contacts II—-I0 conductor 42, closed contacts
Whenever terminals 22 and 2| are short-cir
cuited, the recording machine is in the reproduc
ing condition because no energy is available for
obliterating head 1 or for relays 26 and 21. In
I33—I‘34 of relay 60, conductor I35, winding 6|,
and conductors 62, 63, 51 and 4| to the other [side
of transformer secondary winding 33. Because,
the circuit just traced includes tape contacts
II-—I0, it will open when contacts II--I0v open
and release relay 60.
Relays 53 and 60 are now
addition, relay I02 is deenergized, closing contacts
I04 and I05 and lighting re’producing indicating
light I52 through a circuit starting at transformer
secondary winding 33, conductors 40, I2I, closed
contacts II5—I I1 of relay 91, conductors 36 and
I53, lamp I62, conductors I54, closed contacts
- I05-I04 offrelay I02, and conductors H3 and 4|
to the other-side of transformer secondary wind
ing 33. Switch I41 does not interfere with start
ing of the machine, because relay I 06 is released
except while the machine is running and does not
both released and in/condition to be re-operated
by coin contacts 46 and 49. No provision is in
cluded for storing coin impulses but 'mechanism
to perform this function may be readily added if
connect switch ,' I41 until relay. I02 has already
person may make’ a recording and hear It played
performed its starting function.
As has ‘been described, upon dropping a, coin, a
2,379, 648
after the ?rst passage of said medium through
said machine, reproduction will be provided re
“1, and by dropping another coin, hear the same
gardless of the condition of said second manually
recording repeated twice. There is a delay after
controlled means, and after the second such pas
each dropping of a coin, until the ampli?er is
the machine will automatically stop.
ready for operation. This waiting period is in
4. In a continuous magnetic tape recording and
dicated by the "standby” pilot lamp, and as soon
reproducing machine, means operable to initiate
as the machine is running, either the recording
the running of said tape, switching means opera
lamp, or the reproducing lamp will be lighted, de
tive during said running and adapted to condition
pending upon the position of switch I" during
said machine for recording during the ?rst pas
the ?rst half of the cycle, and the reproducing 10 sage
through said machine of said tape, further
lamp will always be lighted during the second half
switching means adapted to condition said ma
of the cycle. Although the speci?c apparatus above
chine for reproducing after said ?rst passage of
described utilizes a notch in the magnetic tape, it
said tape, and automatic means disposed to stop
is to be understood that suitable timing mech- ,
said ‘running at or about the completion of the
anism or other automatic means responsive to
second passage of said tape through said ma-_
operation of the machine may be utilized to prac
tice the invention.
5. In a recording and reproducing device, an
I claim:
magnetizable recording medium, driving
1. In an electromagnetic sound recording and
means for passing said medium through said de
reproducing machine, an endless magnetizable
vice at substantially constant speed, and auto
and demagnetizable recording medium, driving
matic means including limiting means operative
means operable during functioning of said ma
simultaneously with said driving means and dis
chine and disposed to cause motion of said med
posed to terminate operation of said driving
ium, and terminating means arranged to termin
means after substantially two complete passages
ate operation of said driving means after sub
of said medium through said device.
stantially a predetermined integral number of
6. In a recording and reproducing machine hav
complete passages of said medium through said
ing an endless flexible magnetic recording me
machine, said terminating means including means
dium, starting means, and electrically controlled
for changing from recording to reproducing oper
means responsive to each passage of said medium
through said machine, whereby the completion of
2. In a recording and reproducing machine hav
the ?rst passage of said medium will condition
ing an endless ?exible magnetic recording medi
said machine for reproducing and the copmpletion
um, manual starting means, and automatic elec
of the second such passage will stop said ma
trically controlled means responsive to each pas
sage of said medium through said machine, where 35 chine.
7. In a continuous magnetic tape recording and
by the completion of the ?rst passage of said
reproducing machine, means operable to initiate
medium will condition said machine for reproduc
the running of said tape, switching means opera
ing and the completion of the second such passage - tive during said running and adapted to condition
will automatically stop said machine.
said machine for recording during the ?rst pas
3. In a magnetic recording device, comprising 40 sage through said machine of said tape, further
an endless ?exible magnetic recording medium,
switching means adapted to condition said ma
manual operation initiating means, automatic
chine for reproducing after said ?rst passage of
means responsive to said operation initiating
said tape, and means responsive to the substantial
means and to successive passages of said recording
completion of the second passage of said tape
medium through said machine, and additional 45 through said machine and disposed to terminate
manually controlled means, whereby after initia
said running of said tape.’
tion of operation by said ?rst named manual
back once. If he so desires, he may close switch
means recording or reproduction is under control
of said second manually controlled means, and
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