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July 3, 1945. v E, M_ SQUIRE ‘ 2,379,548 COIN OPERATED VOICE RECORbING MACHINE ‘ Filed mgrcn'e, 1942 INVENTQR. IV/r/VESS: I Patented July 3, 1945 2,379,548 ' _UNITED STATES PATENT OFFICE" COIN -0PERATED VOICE RECORDING MACHINE ‘ 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 peated. ‘ 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 inwhich 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 2 2,379,548 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 2,379,548 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. 3 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 machine. 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 desired. person may make’ a recording and hear It played 4 y I ' I performed its starting function. I » As has ‘been described, upon dropping a, coin, a I 4 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 sage 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 15 anism or other automatic means responsive to second passage of said tape through said ma-_ operation of the machine may be utilized to prac chine. tice the invention. 5. In a recording and reproducing device, an I claim: endless magnetizable recording medium, driving 1. In an electromagnetic sound recording and means for passing said medium through said de 20 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 ation. 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. 7 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 EDMUND M. SQUIRE.