US2422143A - Magazine type magnetic recorder and reproducer - Google Patents

Magazine type magnetic recorder and reproducer Download PDF

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Publication number
US2422143A
US2422143A US520508A US52050844A US2422143A US 2422143 A US2422143 A US 2422143A US 520508 A US520508 A US 520508A US 52050844 A US52050844 A US 52050844A US 2422143 A US2422143 A US 2422143A
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Prior art keywords
magazine
cabinet
drive
tape
switch
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US520508A
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Richard M Somers
Roscoe C Van Camp
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Thomas A Edison Inc
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Thomas A Edison Inc
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1883Driving; Starting; Stopping; Arrangements for control or regulation thereof for record carriers inside containers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/44Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
    • G11B15/442Control thereof
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/675Guiding containers, e.g. loading, ejecting cassettes
    • G11B15/6751Guiding containers, e.g. loading, ejecting cassettes with movement of the cassette parallel to its main side, i.e. front loading

Description

June 10, 47 R. M. SOME-IRS ETAL MAGAZINE TYPE MAGNETIC RECORDER AND EEIRODUCER Filed Jan. 151, 1944 4 Sheets-Sheet l I'mmutor Somem Roscoe CVaJZ (23min Gttomcg June 10, 1947. R, QOMERS ETAL 2,422,143 I MAGAZINE TYPE MAGNETIC RECORDER AND REPRODUCER Filed Jan. 31, 1944 A Sheets-Sheet 2 3mwnfor rdMSbmers I PoscoeCMarzGmp fad 3 -9 r June 10, R. M. SOMERS ET AL uAGAziim TYPE MAGNETIC RECORDER .AND HEPRODUCBH 4 Sheeis-Sheet 3 Filed Jan. 51, 1 944 10 :Iiii
' Richard m P m &m 4 x mm 3% Do NOT ps2; Foaam aowcmw June 10, 1
R. M. 5OMERS ETAL MAGAZINE TYPE MAGNETIC RECORDER AND REPRODUCER Filed Jan. 31, 1944 4 Sheets-Sheet 4 Ill/1 s I? g a Bummer rci M. Somers Poscoe CI IrzGzmp 2; 'Qlrorncu Patented June 10, 1947 UNITED STATES PATENT (JFFEQE MAGAZINE TYPE MAGNETIC RECORDER AND REPRODUCER Application January 31, 1944, Serial No. 520,508
26 Claims. (Cl 179-400.?)
This invention relates to telegrsphoncs and more particularly to improvements in the construction, operation and control oi telegraphones. Our invention is particularly concerned with telegraphones having removable magazines to permit replacement of the magnetic clement; while such telegraphones are primarily of the recording type, it will he understood that many features of our invention are applicable to both recording and reproducing telegraphones. Furthermore, our invention has special relation to tclegraphones which ar adapted to operate a multiple times along the length of a magnetic tape in transversely spaced lines or lanes of the tape, such telegraphones being commonly known as the multiple-lane type.
It is an object of our invention to provide an improved structural arrangement of telegraphone adapted to facilitate removal and replacement of the magazine, a feature of our invention in this respect being to mount the magazine in a socket in a cabinet in drawer fashion.
It is another object of our invention to provide a new and improved organization of the diflerent components of a telegraphone, which is particularly adapted to permit fulfilment of the storestated object with the use of a. simplified structure.
is is another object to provide a latch for bolding the magazine in mounted position which is operatively coupled with the machine to prevent possible mlsoperation of the machine incidental to removing or installing the magazine.
It is another object to provide saicguarding controls for the. machine which are operated automatically incidental to mounting and removing the magazine.
It is another object to provide an improved means adapted for positively reversing the. magnetic tape automatically at the end of travel oi the tape in each direction.
It is another object to provide an improved mechanism {or concurrently reversing the tape and selectively conditioning the machine for operation on the respective lanes of the tape.
It is another object to provide a, manual means for restoring the selector mechanism to an inmeans in normally locked condition and to release it only as an incident to manipulating it in a direction different from that of its effective movement.
It is another object to provide a latch for holding the manual means in its released condition until it is operated to restore the selector mechanism to initial position.
It is another object to provide means efl'ective while the manual means is in released condition lcr limiting the movement 01' the latter to a. position wherein the selector mechanism is in initial position.
Still other and allied objects and features of our invention will be apparent from. the following description and the appended claims.
In the description of our invention reference is had to the accompanying drawings, of which:
Figure l is a perspective view of a telegraphone unit according to our invention;
Figure 2 is a front elevational view of the removable magazine of our telegraphone;
Figure 3 is a. top plan view, with a cover portion removed, of the abovementioned magazine;
Figure 4 is a. fractional sectional view taken substantially on the line I-4 of Figure 3;
Figure 5 is is detailed fractional view illustrating the operation oi the selector control switches of the magazine by the magnetic tape;
Figure 6 is s, fractional sectional view taken substantially on the line 6-4; of Figure 3;
Figure '1 shows top and bottom views to reduced scale of cooperating parts of ratchet drive transmissions for the supply and take-up reels of the magnetic tape;
Figure 8 is a top Dian view of the cabinet section below the magazine;
Figure 9 is a front elevations view, with the front panel or the cabinet removed, showing the mechsrn'sm in the lower cabinet, section;
Figure 1c is c bottom plan view of the mechanism in the lower cabinet section;
F'igureli is a rear elevctional view of a stepping-relay selector mechanism provided in the lower cabinet section;
Figure 12 is a view, partly broken away, taken substantially on the line l1-l2 of Figure 10;
Figure 13 is an axially sectional view of the stepping-relay mechanism, taken substantially on the line l3--l3 of Figure 11;
Figure 14 is a. detailed sectional view taken substantially on the line -44 of Figure 13;
Figure 15 is a fractional sectional vie-w taken substantially on the line 15-45 or Figure 8;
Figure 16 is a, iractional sectional view taken ft 1.") tantisilly on the line iii it": of Figure S; and We 17 3, diagrammatic view of circtu'ts and mechanisl i tccording to our invention.
A; i shown in Figure l, the present telegraplione comm a substantially rectangular. cabine' l n i lower or main section 2 and an upper or the section 3, the sec-- tion beirr insfter termed the magazine. The
the components of the machine lO'fi'ClE automatic safeguarding concicttion with the magazine is hererx olained.
f ii llli of our invention for the purposes lust. to provide all components of the drive ini rn in the magazine except for the drive the advantage in this arrangement being one drive coupiin: is required between *1 tth'lliliCt section and the ezine. Reftilt; top plan y... i of the mag- *re 3, the drive mechanism will LLR'O reels and S for a. magreels are positioned in the magazine respectively at the tlereoi, in which positions on tutis 3 held by screws 9 e magazine as indicated i travel of the tape in Figure 3, the left up 1 reel and the right- I rcl. Between these o roel E. the tape passes 2D- an idler pulley ii, then dl'lCl osimately 180 around at around this drive pulley 8nd "tcond idler pulley and there i 180 around this idler pulley The drive pulleys i2 and epending upon the direc f trevcl of the tape. to null the tape at cono nd box, and in through the tone n may drive the to e Without slip- I ieries thereof are covered. with a 18 or a frictional material. such as of rubozrn in Figure 6. cdirection oi" travel of the tape indicated til, the operation of the drive mechthe reel 8 is overctlonel slip so that the tape 1 pulley it will be held taut '3 $4. This pr ssure of the t pulley i i serves to produce s fllCiiOIllll driving connection of the pulley to 6: so that t..e pulley pulls the tape righttiirculih the tone head box 33. Concurimply reel rts a frictional drag holds the tape under tension as it fill For operating the drive mechanism in the magazine there is an electric motor i7 provided in the lower cabinet section 2. This motor coupled through gear reduction lltll'lSllllbSlOll it; to upstanding shaft 18 shown in Figures 10 and 16. Spline-d to the upper end oi the shaft is a clutch member 20. Thi member has 21 61 of diametrically disposed vertical pins 2i adopted to engage a corresponding coupling member 22 on the magazine to effect a drive connection of the motor to the dlll'e pulley 12 when th magazine is in mounted position. the manner in which this coupling is made being hereinafter described in detail.
The coupling member 22 has an upstanding shaft 23 integral therewith which is journalled in a bearing 24 held by screws 25 to the bottom wall of the magazine. The drive pulley 12 i; secured to the shaft 23 by a set screw 26 and seats onto, and surrounds, the bearing '26 as shown in Figure 6.
The means [or taking power from the pulley 2 to operate the drive mechanism in th magazine comprises a doubly-grooved pulley 27 formed integrally with the drive pulley l2. a similar doublyiZI'OOVGd pulley 28 formed integrally with the drive pulley i4 ilhe pulley 54 being jolllnallod on a. stud bolt 35 held to the bottom plate of thamagazine as shown in Figures 2 and 3 and two similar doubly-grooved pulleys 29 and 30 Journalled on th stud bolts 8 below the reels 5 and 6 indicated in Figures 3 and 6. These four pulleys are driyingly interconnected b 0. pair of cords or belts 32 which run over tensioning idler pulleys 33 provided respectively between the pulleys 2? and 29 at the left side of the magazine and between the pulleys 28 and 30 at the right ide of the magazine. these idler pulleys being journellecl on brocke: 34 which are ridjustabl secured to the bottom ivall'of the magazine.
The pulleys 123 and 30 ar coupled to the respective reels 5 and 6 by means of frictional and ratchet drive transmissions such as are shown in Figures 6 and 7, these transmissions being identical except for the ratchet drives being oppositely directed as indicated in Figure 7. transmission between the pulley 29 and reel 5, for example. comprises a. pair of upwardly bowed leaf spring 35 held to the bottom face of the pulley 23 by screws 35. These sprinzs engage the lower face of a ratchet wheel 37. This ratchet wheel is iournallecl on the upper portion of the stud bolt. 8 against the hub of the pulley 29, and has four radially-extending slots 38 with which the tips of the springs 35 may engage to effect a one-way coupling between the pulley 23 and ratchet. wheel. The hub 5a of the reel 5 journalled to the hub 31a of the ratchet wheel and is pressed yieldably against the top {ace of the ratchet Wheel by downward pressure of a compression spring 40 actin against a washer 33 loosely surroundin the hub 33a, the compression spring being held in position by a nut 4! that is threaded onto the top portion of the hub 37a. However, interposed between the hub 5a of the reel end the top and bottom faces of the ratchet wheel 3? and Washer 38 respectively are friction pads 42 made for example of felt. The yielclable clamping of these pads against the hub of the reel 5 permits frictional slip between the ratchet wheel and the The coupling between the pulley 30 and reel 3 is identical with the coupling between the pulley 28 and reel 5 as just described except that there is here provided a pair of springs 43, corresponding to the springs 35. which are oppositely directed from the springs 35 for coaction with a ratchet wheel 44 similar to the wheel 31 as shown in Figure 7. As is illustrated, the oneway ratchet coupling between the pulley 28 and the reel 5 is effective when the pulley moves in a counterclockwise direction and that between the pulley 30 and reel 6 is effective when this pulley moves in a clockwise direction. Thus, whenv the tape is driven in the directions of the arrows l appearing in Figure 3, the coupling to the take-up reel is engaged but that to the supply reel is disengaged.
*All of the pulleys 21, 28, 29 and 30 have equal diameters so that they will be driven at the same rotational speed by the motor II. The diameters of the coils of tape on the reels and 6 are however always greater than the dlameter of the drive pulleys l2 and I4. Accordingly, when the tape is driven in the direction or the arrows Hi, the reel 5 tends to be driven at the same rotational speed as the drive pulley H, but the greater diameter of the coil of tape on the reel 6 causes this reel to tend to take up.-
the tape at a faster rate than it is supplied by the drive pulley. The reel 6 thus holds the tape taut against the drive pulley l4 and the drive pulley becomes controlling because the frictional couplin of it to the tape overpowers the frictional coupling between the reel 6 and it corresponding drive pulley 30, with the result that the take-up reel is constantly overdriven with frictional slip as abovementioned. At the same time the ratchet coupling to the supply reel 5 is movedln inefiective direction and no force is exerted on the reel to unwind the tape; rather, the friction in the mounting of the reel causes it to exert a drag on the tape to hold the tape taut as it is pulled through the tone head box. The above explained drive coupling between the motor IT and the drive pulley 12 of the magazine is disengageable to permit withdrawal or the magazine from the cabinet and is controlled to reengage automatically when the magazine is remounted. For these purposes, as is shown in Figures 8 and 16, the clutch member 20 is biased upwardly by a spring 45 into position to engage the coupling member 22 of the magazine, and a control lever 46 is connected to the clutch member for disengaging the clutch member as required. The control lever is pivoted to a bracket 41 on the top side 2a 01' the lower cabinet section 2, near the front left corner thereof, and has two rearwardly-extending arms 46a lying at diametrically opposite sides of the clutch memben These arms have pins 48 which engage a peripheral groove 49 in the clutch member so as to couple the control member to the clutch. Under pressure or the spring 45 the control lever is normally held in a slightly upwardly inclined position as shown in Figure 16.
Overlying the central and major portion of the top side 2a of the lower cabinet section 2 is a latch member 50 for themagazine. This latch member comprises a flat plate portion pivoted at 5| to the rearward portion of the cabinet, and a front portion projecting ahead or the front panel of the cabinet which is bent upwardly to form a catch 52 and then forwardly and gradually downwardly to form a push means or cam 53. The latch member is biased upwardly by a leaf spring 54 mounted on the top side of the lower cabinet section 2, andthe upper position or the latch member 1s defined by a stop controls the drive motor as is hereinafter ex--' plained. The action of this latch member is as follows:
In the upwardly biased DOSltlOn of the latch member the cam 53 thereof extends up into the path defined by the magazine as it is moved into and out of the cabinet. Thus, when the magazine 1 is inserted into the cabinet the bottom of the magazine will first slidably engage this cam and move the latch member downwardly. As the latch member is so moved the tab 55 depresses the clutch lever 46 to move the clutch member 20 downwardly out of the path of the magazine, and the tab 51 operates the switch 58 to of? position so as to assure that the drive motor will be stopped. When the magazine reaches fully mounted position. it slides oil from the catch 52 and the latch member then is snapped upwardly by its biasing spring to latch the magazine in the cabinet. The upward movement of the latch member frees the clutch lever 46 to permit reengagement of the clutch member 20 with the corresponding coupling member 22 of the magazine and; simultaneously, the switch 58 is restored to on position so that the drive motor may again be put in operation. (It will be understood that a primary start-stop control for the drive motor is provided, as is hereinafter explained, and that the switch 58 is provided as a precautionary means to assure, among other things hereinafter explained, that the drive motor will be idle during mounting and removal of the magazine into and out of the cabinet. While th pins 2| of the clutch member 20 will not ordinarily be aligned with the holes in the coupling member 22 to permit the clutch member to engage immediately upon the magazine reaching mounted position, this alignment will occur in the first fraction of a revolution of the clutch member and the clutch member will then move to engaged position under the influence of the spring 45.
When a magazine is to be removed from the cabinet the latch member 50 is first released from the magazine by applying a downward pressure with the hand onto the forwardly-projecting cam 53. This is accomplished automatically as the handle 4 is gripped by the hand for the cam 53 lies directly below the handle where it will be pressed downwardly by the fingers as one takes hold of the handle to withdraw the magazine as shown in Figure 1. This downward movement of the latch member causes the clutch to be disengaged and the motor circuit again to be opened, permitting the magazine to be withdrawn from the cabinet without danger of any misopcration of the machine. It will be understood that the latch member need be depressed only during the initial withdrawal of the magazine from the cabinet, for as soon as the magazine has been moved out of mounted position the bottom thereof will engage the catch 54 and hold the latch member depressed during the further withdrawal of the magazine. Thus, the magazine is unlatched and removed simply by gripping the handle 4 and pulling outwardly from the cabinet.
Th telegraphone here shown is of the multipie-lane type. These telegraphones require a translating means which is conditionable selectively for coaction with successiv lanes of the tape. Such selective conditioning may be effected by moving a single tone head, by steps, across the tap so that it will operate along successive lanes of the tape. Preferably however we provide a plurality of offset tone heads. one for each lane of the tape, and perform the selective conditioning by connecting these tone heads selectively to the audio circuit of the machine. The aforementioned tone head box 13 therefore comprises a plurality of consecutively offset tone heads 60 of which there are typically eight as shown in Figure 17. Each of these tone heads comprises a pair of field coils SI and respective cores pieces 62 placed axially in line with each other at opposite sides of the tape. The construction of these tone heads is conventional and need not be herein further described.
In operation, the tape is driven in one direction while the audio circuit is connected to one of the tone heads. and when the tape has reached the end of its travel in that direction it is re versed and the audio circuit is connected to the next one of the tone heads. This procedure is continued ordinarily until each tone head has scanned the tape, whereupon the magazine may be removed for transcription of the recordation and another magazine may be mounted in the cabinet in its place.
The audio circuit may be adapted for recording or reproducing-i. e., to feed electrical oscillations to the tone heads or to receive electrical oscillations from the tone heads-but by way of illustration, w show an audio circuit primarily adapted for recording purposes only. This audio circuit comprises simply a carbon button microphone 65 together with a suitable operating circuit for the microphone and switch for connecting the microphone selectively to the tone heads. The microphone has a pair of leads 66 connected respectively to the sleeve and ring contacts 61 and 68 of a suitable telephone plug shown diagrammatically in Figure 17 as 10, this plug having also a tip 59 the function of which is hereinafter explained. The plug is adapted for insertion into a. telephone jack 70a provided in th front panel of the lower cabinet section 2 and marked "Input" as shown in Figure l. The lack has sleeve, ring and tip contacts 61a. 68a and 69a respectively. and additionally includes a normally open switch it comprising a pair of contact springs of which one is coupled through an imulating block 12 to the tip 89a so that the switch will be closed whenever the plug Hi is inserted into the jack. The sleeve contact 61a of the jack is grounded at T3-i. e., connected to the irame of the machine-while the ring contact 68a of the sleeve is connected through the primary winding 15a of an audio transformer 15 to an adjustable tap 78 of a volume control or rheostat l7. One end of this rheostat is connected to ground but th other end is connected to one side of a battery 78 by way of the aforementioned switch 58, a second switch '19 hereinafter particularly described, and the switch H just mentioned above. The other side of the battery 18 is connected to ground as shown. Thus, whenever the switches 58 and 79 are closed-whlch the switch 58 is when a magazine is mounted in the cabinet and the switch I9 is when the selector mechanism of the machine is in correct operating condition as will hereinafter appearbattery potential is available to the microphone upon the plug being inserted into the jack. However. in the microphone circuit 66 ther is a pair of makeand-break contacts 80 of a normally open hand switch 8! which is provided for starting and stopping the machine as during dictation. Accordingly, potential is supplied to the microphone to render it operative only when this hand switch is closed to start the machine.
In the lower cabinet section 2 there is a selector switch 82 for selectively connecting the microphone to the respective tone heads 60. This switch comprises a set of terminals 83 of which there is one for each tone head and a first idle terminal 83a. Associated with this set of terminals 83 is a movable contact means 84 con nected by a shielded lead 85 to one side of the secondary 15b of the audio transformer 15, the other side of this secondary being connected to ground. The terminals 83 of the selector switch, except for the idle terminal 83a, are connected respectively to a set 86 of contact springs included in a bank 87. the springs of this bank bein; mounted in an insulating block 88 that i supported at the top of the lower cabinet section 2 as shown in Figure 8. Additionally, corresponding to the idle terminal 83a. there is another one of such contact springs 86a which is however permanently connected to ground. These contact springs bow upwardly above the block 88 and are exposed to the magazine chamher by way of an opening 50a provided in the latch member 50. At the bottom of the magazine there is mounted a terminal bank 89 including a set of terminals 90 and 90a corresponding to the contact springs 36 and 85a of the bank 81, these terminals being mounted in an insulating block 9! as indicated in Figure 3. These terminals of the magazine slidably engage the respective contact springs 8E as the magazine is slid into the cabinet. The first of the terminal set 90 on the magazine, designated as 90a in Figure 17 and corresponding to the grounded contact spring 85a of the bank 87. is itself grounded to the frame of the magazine and connected by a lead .32 to one side of each of the tone heads: the other eight terminals of the set 90 are however connect by a shielded cable 93 to the other sides of the respective tone heads. From the forego- 111g description it will be apparent that voice currents from the microphone 65 will be fed to one or another of the tone heads 60, depending upon the setting of the selector switch 82- by way of the transformer 75, shielded lead 85. the movable contact means 84 and associated terminal 83 of the selector switch. the respective contact. spring 86 and terminal 90 of the banks 87 and 89 between the lower cabinet section and the magazine, and the cable 93.
The reversing of the tape-driving mechanism is preferably carried out by reversing the direction of rotation of the motor 11, and to this end we provide a motor of the shunt type depending for its direction of rotation upon the relative polarity of its shunt field Ila and armature lib. This motor is energized by the battery 78, which may typically have a potential of the order of 24 volts. Current supply to the motor is controlled by a start-and-stop relay 95 for the machine having a field coil 95a one side of which is connected by way of the aforementioned switches 58, 79 and 1! (see Figure 17) to the battery 18, and the other side of which is connected to ground by way of the tip contacts of the jack and plug 10a and 10, a pair of makeand-break contacts 8011 included in the startstop hand switch 81 and the sleeve contacts of the plug and jack to the ground 13. The shunt field Ila has a direct connection to the battery by was of a lead 97. the contacts of the relay 95 and a lead 98, but the current supply to the armature is taken from the lead 97 through a reversing switch comprising a section of the selector switch 82. The reversing switch comprises series of pairs of terminals 99 and a pair of respectively cooperating movable contact means we. The first pair 59s of the terminals 3% is idle and represents-stop terminals for the motor, but the remaining pairs, of which there is one for each tone head Ell. are interconnected in crisscross relationship. The last of these interconnected pairs is connected respectively to the lead 8'? and to ground, and the movable contact means WE are connected across the armature lib. These movable contact means I06 are mechanically connected to the aforementioned contact 84 to move in unison therewith as is hereinafter described. Thus, when the movable contacts of the selector switch are advanced from on position to the next, not only is the microphone 65 connected to a next succeeding one of the tone heads (ill but the polarity of the armature ilh is reversed relative to that of the shunt field lid to reverse the direction of drive of the magnetic tape.
The composite selector switch 82 above functionolly described is very simply provided in rotary form as illustrated in Figure 10. ll, 12 and 13, The switch comprises a shaft NH extending forwardly through the front panel of the lower cabinet section 2 and passing through a pair of downwardly-erttending legs 56% of a U-hraclret H33 held by screws EM to the top plate 2a of the lower cabinet section. Secured to the shaft ID! by a screw toil see Figure 13) is an armsture tilt: for the switch having a shouldered huh lllfia that is journalled in the legs hill of the bracket H73. Onto this hub there is clamped a small insulating disk 33?, the clamping being done by a nut illB which threads onto the hub and presses the disk against a shoulder portion of the hub. Riveted to this dislr are three pairs of contact arms, spaced 120 apart. of which one pair represents the aforementioned movable contact means it and the other pairs repre sent the aforementioned movable pair of con tact means tilt? of the selector switch as is hereinafter more fully explained. At the front and back of the armature 435 there are centrally nperturcd insulating disks ill and it? which are secured to the depending lugs of the bracket H33 and held concentric to the shaft till, the front disk ill being held for example to the bracket by screws iiti as indicated in Figure 13. This front disk Hi carries twenty seven euually-spaced contact terminals of which one continuous set of nine represent the ahoveinc-ntioned terminals 83 of the selector switch, and the remaining continuous set of eighteen renresent the terminals 88 of the reversing switch section of the selector switch. Riveted to the other stationary disl; H2 are three arcuate contact members lid. H and iii; which are equally spaced and each approximately 120 long. The contact member lid is angularly aligned the terminal set 83 and the two contact members H5 and HE are angular-2y aligned with the terminal set 99, Each pair of the movable contact means 8G and Hill comprises two electrically interconnected blades that are spaced apart ax ielly along the shaft Nil as shown in Figures and 13. One of these blades slldahly engages continuously one of the arcuate contact men2- ltd, ill or lie and the other blade slidaoly engages one of the terminals i l or Sit. It will be understood that the shielded lead will have direct permanent connection to the arcuete contact member ti l and that the leads from the motor armature llh will be connected respectively to the arcuate contact members H5 and H6. It will moreover be understood that the last eight of the set of terminals, 83 are connected to the respective contact springs 38 as hereinbefore explained, and that one group of alternate ones of the last sixteen of the terminal set lit will be interconnected to each other and be connected to ground and that the other group of alternate ones of the last sixteen of this set $19 will be likewise interconnected to each other and further connected to the current supply lead ill. Accordingly, it will be observed that with continuous stcp-by-step advance of the an mature Hi5 in one direction the selector switch is moved recurrently through its successive Dositions with the movable cont-act means 84 and 3% always advancing from left to right as they appear in Figure l? and with each succeeedinr. one of the respective movable contact means 86 and illll taking on the function of the one just ahead of it after each nine intervals of advance of the armature.
For successively advancing the armature N36 or the selector switch at the end of travel of the tape in each direction, we provide a stepping mechanism which together with the selector switch 822 may be termed a stepping relay; This stepping mechanism comprises ratchet HF" operated by a solenoid lzli as shown in Figures 11 and 13. The ratchet comprises a ratchet wheel 22 positioned behind the bracket Hi3 and made integral with the aforementioned hub lillio. Pivoted at 523 to the bracket 593 is a rock lever 2 and pivoted at Hill to one end portion of this rock lever is a feed pawl ill: which is urged by a ten-- slon spring it? into engagement with the ratchet wheel. Coupled by a link itil to the other end of the rocir lever is the armature $25 of the solenoid llli. This solenoid is preferably of the ironclad type and comprises a coil E38 surrounded by a rectangular iron frame I35 and provided with a core piece 532, all as is indicated in Figure 11.
When the solenoid is not energized. the rock lever i2 5 is held in an advanced or operated position by a, tension spring connected between the lever and the. plate 26:, which position is dcfined by the abutment oi the lever against an adjustable screw i33a in a turncd-over lug or the bracket ltd. When the solenoid till is energized, the rock lever is turned irom its advanced posh tion attains the force of the spring 133 but in so turning it does not impart any movement to the armature of the selector switch, the effect of this turning being only to cock the ratchet l2fl by withdrawing the cod pawl lilo from one tooth to the next of the ratchet wheel H2. Upon interrupting the current supplied to the solenoid, however, the reel: lever lid is propelled forward ly by the spring lift to advance the selector switch from one position to the next.
The solenoid ill is controlled so that it will be momentarily energized once at the end of travel of the tape in each direction. The means for so controlling th solenoid comprises a pair of selector control switches |3fi and i 35 respectively com prising seznistationary contact arms iii-la and 535a and; movable contact arms w th and 553%. the arms of each switch being biased to open positions. These switches are positioned in the can":
Lui a magazine between the idler pulleys ii and or the magnetic tape drive mechanism. switches being held insuletedly in cantilever f sliion in a. stack Hill which is bracketed to the bottom plate of the magazine. The outer sides of the movable contact arms 35b and i351: are faced insulating strips i3? .1. ese strips lie adjacent to the idler pulleys 2 and with the magnetic tape passing between the strips and the pulleys. 0n the magnetic tape l. near each end thereof, there is a thickened strip portion let. its this strip portion rides over one or the other of the idler pulleys ii or i presses the adjacent strip Q33 in \vardly to close the corresponding switch 931% or K35 as shown in Figure 5. Preferably. this strip portion To 0: the tape is formed simply by crinklinr: or corrugeting the tape for example by running the tape between two intermeshing ence being lied to Figure 17,1. will be seen e no semistatidery contact arms Hilaoi tie switches 55% and 235 are each connec ed by a common leed $81 to one side of the solenoid 325. the other side of the solenoid being grounded as shown. This lead connection is made from the magazine to the lower cabinet section 2 through contact terminals end contact springs S38 and E35 comprised in the aforementioned switch contact hanks tll and 8'5. The movable contact arms of the switches i134 and are connected by leads and respectively by Way of terminals and contact springs 5'2- ll and IMF-i 35 of the banks :38 and 8?. to the respective movable contact means 58E: of the reversing section of the selector switch.
In the positions occupied in Figur 17 by the movable contact means lilll of th selector switch, potential from the battery F8 is supplied to the lead Us! running to the switch 35 provided of course the stert-stop relay $5 is closed. For the direction of travel of the tape indica ed by the arrows ill in Figure the swlic'. do will be closed by the crinkled tape portion it: running o er the idler p 11. i l as the tape nears the end of its travel. nc switch 3% is closed by the corrugated tape portion 5a. the solenoid 52% withdraws the pawl :26 from one tooth to the next succeeding one of the ratchet Wheel 32: and then when the corrugated tape portion it: has
moved past th switch and the switch reopens to deenergize the olenoid. the relay is advanced the selector switch is to shift the potential supply from lead :"l running to switch l 36 of switch a; and to connect lead it! to ground. In the initial reverse travel of the tape following the advance or the selector switch, the tape section '-'a will again ride over the id or pulley ii to again close and open the switch but this second operation of the switch 235 has no controlling action on the mschine since the lced S ll of the switch is now grounded. Thus the tape will continue to travel in its reverse rcction until it nears the end of its travel in that direction. whereupon the switch :M will be mementerily closed to cause the select-or switch to be advanced another position. to restore potential supply again to the lead i l! of the switch 535, and to cause the tape to be again driven in the direction of the arrows la: in Figure 3. Upon continued operation of the machine this process will continue with the selector switch advancing successively at the end of travel of the tape in each d'"ection. At the completion of recorclation Int. of the last line of the tape, however, the selector switch is advanced to place the movable contact means 86 and in contact with the idle torminals 33a 39a. whereupon the operation of the machine is stopped.
Due to the inertia. of the plunger I29 and of the mechanism coupled thereto, there is unavoidably some delay in the response of the plunger to current. energize-hon of the solenoid coil 536. As a. result. because of the high speed of travel of the tape a single corrugation of the tape does not hold the switches 3 or 35 closed sufficicnt- 13 long to assure positively that the pawl 126 will be retracted and the stepping mechanism be then operated when the switches are next opened. However. there is provided a succession of corrugations in along a length of the tape which. taking into account the speed of the tape. will hold the switches closed for a sufficient period to assure full retraction of the pawl and consequent operation of the stepping mechanism when the switches are reopened.
It will be observed that the switches (34 and I35 are rendered effective alternately in the machine by the r versing section of the selector switch S2; moreover, it will be noted that by not advancing the selector switch until the switch 534 0r last closed is restored to open position. and by then transferring the control function from that one of the switches 134 or 335 to the other sinr tsneousiy with the operation of the selector switch, there is obtnined a very positive and dependable operation of the selector mechanism at the end of travel of the tape in each direction. The apparatus by which this positive operation is attained is not claimed herein but is described and claimed in the divisional sole application Serial No. 540.259 of Richard M. Somers.
Upon sliding the magazine out 01' and into the cabinet the bottom Wall thereof may slidsbly cm page the contact springs of the bank 8'! and short them with one another. This produces no effect however because in positions of the magazine wherein this shorting occurs. the switch '58 in "()fi' position slid the Whole telegraphone system is out of operation.
Just behind the front panel of the lower cabinet section there is a dial H6 having a hub Ml secured by a set screw M8 to the shaft till. This dial has numbers thereon one of which is rcndcretl visible through a Window M9 or" the front panel in each position of the selector switch. The number exposed indicates the position occupied by the selector switch or, in other words. the lane of the tape on which the machine is operating. F r example. the dial has the number at the window i 35 when the movable contact moans 5:1 and fill? of the selector switch are in Ben positions-i. e.. in contact with the idle terminals 8M; and 950.. In clockwise direction from the number 0" are numbers running consecutively from 1 to When the selector switch is in the first of its closed positions. the positi which it occupies Figure 17, the number 1" on the dial appears at the window #59, and for the next higher positions of the selector switch a corresponding number on the dial will appear at the window. Since the selector switch is advanced through the range of its positions for each 1220 advance of the armature Hill of the switch. this succession of numbers from 0" to 8 is re peel-ed -within each 120 angular interval on the dial, there being accordingly three such sets of numbers as shown in Figure 9.
In the usual and customary operation of the machine the operator will begin recordation on the first lane of the tape, i. e., with the selector switch in position 1. Should an operator have recorded on only some of the lanes of the tape when he removes the magazine for transcription of the recordation. the selector switch will be left in some intermediate position. Accordingly. before beginning recordation on the tape of a new ly-mounted magazine. he will want to restore the selector switch to 1" position. This restoration of the selector switch is performed manually by aknob I50 at the front of the panel on the shaft IIII. It is however a feature of our invention to have this knob normally locked. and to require that it be depressed before it is operable to advance the selector switch. An advantage in this mode of enforced operation of the knob arises by the provision of three equally-spaced and radially-projecting fins II on the knob, and of a stop pin I52 on the front panel for co-operation with these fins as indicated in Figures 1 and 10. In the outward position of the knob the fins I5I clear the stop pin I52 to permit the selector switch to be advanced automatically at the end of travel of the tape in each direction. When the knob is depressed. however. the pin will lie in the path of these fins and will serve. by its abutment against one or another of the fins. to stop the knob in 1" position of the selector switch.
In order to facilitate this manual return of the selector switch to 1" position. we provide means operable automatically to latch the knob in depressed position upon the knob being depressed while in any position of the selector switch other than its "1 position: the latch is however released when the selector switch is restored to l position. This latch means comprises a disk member I53 secured to and projecting from the huh I" of the knob. This disk member has an inclined peripheral surface I53aprovided with three equally-spaced peripheral slots I53b extending through the member. Pivoted to the front, leg of the bracket I03 at I54 is a latch arm I55 as shown in Figures and 14. This latch arm has a nose 155a sufficiently narrow to pass through the respective slots I531). Normally the latch is held against a stop pin I58 by a spring I51 in which position thereof the nose I55 z lies just behind the inclined peripheral surface I530. of the disk member 153. Upon depressing the knob while in an intermediate position the latch arm cammed over the member I53 and the knob is thus latched in its depressed position. However. upon the knob being turned to restore the selector switch to 1" position. the nose will come into alignment with one of the slots I53!) and the knob will then be snapped outwardly by spring means acting on the shaft IOI as hereinafter described. Thus, to manually return the selector switch to 1 position it is only necessary to first press inwardly on the knob and then only to turn the knob in a counterclockwise direction until it is stopped by the abutment of one of the fins I5I against the pin I52.
To permit the knob I50 to be depressed as above explained, the shaft IOI has a splined connection with the hub I06a, which connection is afforded by providing an axial slot I05a in the hub I06a and having the aforementioned pin I05 dis posed within this slot as shown in Figure 13. Bearing against the rearward end of the shaft IOI is a cantilcver-mounted spring arm I58 which yicldably holds the shaft IN, and accordingly the knob I50. in outward positions.
The means for locking the knob I50 against being turned manually when the same is in outward position comprises an arm I 58 pivoted at I23 to the back side of the bracket I03 as shown in Figure 11. This arm carries a cross pin IE0 at its outer end, and is biased inwardly relative to the feed pawl I26 by a tension spring IBI into a position wherein the pin I60 lies directly behind the feed pawl. This position of the arm is defined by contact of a reduced diameter end portion I0 I a of the shaft IOI with the edge of a circular hole I62 provided in an offset portion I55a of the arm I59. When the pin I60 lies behind the feed pawl, the pawl is locked in engagement with the ratchet wheel I22 and the ratchet wheel is therefore prevented from being advanced by means of the shaft IOI-i. e., from being turned clockwise as it appears in Figure 11; on the contrary, the ratchet wheel may be advanced by the feed pawl as above explained. Backward movement of the ratchet wheel is prevented by means of a detent I63 as indicated in Figure 11. Accordingly when the pin I60 lies behind the feed pawl the selector switch is locked against being moved manually by the knob I50 in either direction. On the shaft IOI just in front of the hole I62 in the arm I59 there is the pin I60 beyond the end of the feed pawl. The
feed pawl is then no longer held in locked engagement with the ratchet wheel and, accordingly. the selector switch may now be advanced by the knob I50.
In order to insure that the drive mechanism will be at standstill during the manual return of the selector switch to 1 position we provide means to cause the aforementioned switch I9 to be held open While the knob I50 is depressed. This switch comprises a. pair of cantilever-mounted contact arms 79a held, with the aforementioned arm I58, in a stack I65. the stack being held by screws 66 to the back side of the bracket I03 as shown in Figures 11 and 13. The arm I58 is clamped between the contact arms 19a against the back one of these arms but is made of an insulating: material so that it. will not form any electrical connection to the arms. The contact arms arc biased closed and assume this position when the shaft I0! is moved tooutward position by the arm I58. Upon depressing the shaft. by the knob I50, however, the arm I58 is moved rearwardly and the switch I9 is thereby opened. Reference being had to Figure 17, it will be observed that when this switch is open the circuit of the startstop relay for the machine is held open to prevent operation of the machine.
As a panel light and signal for indicating when the machine is in operative condition, there is provided a lamp I61 which is bracketed to the underside of the plate 2a as shown in Figure 9. This lamp may be connected from the control circuit to ground as indicated in Figure 1'7.
We have herein particularly shown and described a preferred embodiment of our invention. but it will be understood that this embodiment is subject to changes and modifications within'thc range of engineering skill without departure from the scope of our invention. which we endeavor to express according to the following claims.
We claim:
1. A telegraphone comprising a cabinet having a main portion and a slidably removable drawer portion, said drawer portion comprising a mag- 2,422, i as netizable element and drive mechanism for said element: a motor in said main portion for said drive mechanism; and a single drive connection between said main and removable portions for coupling said motor to said drive mechanism, said drive connection being disengageable to permit removal of said drawer portion.
2. In tclegraphone including a cabinet, a slidably removable magazine at least partially within said cabinet, a magnetizable element contained in said magazine, and a drive for said element: the combination of an oiI-on control for said drive; a latch for locking said magazine to sai cabinet; and means coupling said on-ofi control to said latch for causing said control to be throvm to oft" position upon releasing said latch to permit removal of said magazine from said cabinet.
3. In a telegraphone including a cabinet, a magnetizable element and a drive for said element: the combination of a magazine at least partially in said cabinet containing said element and slidably removable from said cabinet; an on-crt" control for said drive; and means operated by said magazine as the magazine is removed from and mounted in said cabinet for holding said control in on position.
4. In a telegraphone including a cabinet, a nisgnetizable element and a drive for said element: the combination of a magazine containing said element and adapted to be slidably moved at least partially into and out of said cabinet; an on-ofi" control for said drive biased into on position; and means operated by said magazine as the magazine is moved into said cabinet for holding said control in oil position until the magazine reaches a fully mounted position.
5. In a telegraphone including a cabinet, a magnetizable element and a drive for said eleme. o: the combination of a magazine containing said element and adapted to be slidably moved 12 least partially into and out of said cabinet; an on-off cOllLrO] for said drive; and means controlled by said magazine for holding said control in position as said magazine is moved into said cabinet and for moving said control to on position and concurrently latching said magazine as the magazine reaches mounted position.
6- In a telegraphone including a cabinet, at ma netizable element and a drive mechanism for .,aid element: the combination of a magazine in- -uding :aid element and slidably movable at least partially into and out of said cabinet; a drive coupling between said magazine and said cabinet. said coupling including a part movable to engage and disengage the coupling; and means, operated by said magazine as the magazine is moved to and from mounted position within said cabinet, for holding said coupling part in disen aged position.
7. In a telegraphone including a cabinet. a magnetizable element and a drive mechanism for said element: the combination of a magazine inciuding said element and removable from said cabinet; a coupling included in said drive mechanism and located between said magazine and the remaining portion of said cabinet, said coupling including a Part movable to engage and disengage the coupling; and means operable to move said coupling part to disengaged position and to concurrently disable said drive mechanism.
8. The subject matter of claim '7 further including means for holding said last-stated means 16 in operated condition as said magazine is moved to and from mounted position within the cabinet.
9. In a telegraphone including a cabinet, a magnetizable element, a drive mechanism for said element and an on-ofl switch for said drive mechanism: the combination of a magazine including said element and slidably movable at lee-st partially into and out of said cabinet; a drive coupling included in said drive mechanism and located between said magazine and the remaining portion of said abinet, said drive coupling including a part movable to engage and disengage the coupling; and means to withhold said coupling part in disengaged position and to hold said switch in oil position as said magazine is moved to and from mounted position within said cabinet, said means being adapted automatically to move said coupling part to engaged position, to restore said switch to on position and to latch said magazine when said magazine reaches mounted position.
10. In a telegraphone including a magnetizable element and a reversible drive mechanism for said element: the combination of means movable to successive positions for reversing said drive mechanism; means for automatically advancing said reversing means at the end of travel of the element in each direction; manual means for advancing said reversing means; locking means for said manual means. moved to released condition by manipulation of said manual means in a direction different from that of its effective direction of movement; and means for holding said locking means in released condition until said reversing means has been moved to a predetermined one of its successive positions.
ll. The combination as set forth in claim 10, including an on-oiT switch for said drive mechanism; and means for throwing said switch to "05" position in response to the said manipulation for releasing said manual means from locked condition.
12. In a telegraphone including a magnetizable element and a reversible drive mechanism for said element: the combination of means movable to successive positions for reversing said drive mechanism; means for automatically advancing said reversing means at the end of travel of the element in each direction; manual means for advancing said reversing means, said manual means being movable to a predetermined position in a direction different from that of its effective movement; and means rendered effective when said manual means is in its said predetermined position for limiting the manual advance of said reversing means to a predetermined position of the latter.
13. In a telegraphone including a magnetizable element and a reversible drive mechanism for said element: the combination of means movable to successive positions for reversing said drive mechanism; means for automatically advancing said reversing means at th end of travel of the element in each direction; manual means rotatable for moving said reversing means to its respective positions in succession; means locking said manual means against rotation, said locking means being released by axially displacing said manual means; means for latching said manual means in axially displaced position, said latching means being ineffective when said manual means is in a predetermined one of its positions; and means effective when said manual means is in axially displaced position for limiting rotation of the manual means to said predetermined position.
14. In a telegraphone including a magnetizable element. a reversible drive mechanism for said element and means advanceable to successive positions for reversing said drive mechanism: the combination of means. including a ratchet mechanism, for automatically advancing said reversing means from one position to the next at the end of travel of the element in each direction, said ratchet mechanism including a ratchet wheel coupled to said reversing means and a cooperating feed pawl; means for manually advancing said reversing means. said manual means being movable in a direction transverse to that of its effective movement; means for locking said feed pawl in engagement with said ratchet wheel whereby normally to prevent advance of said reversing means by said manual means; and means operated by said manual means upon movement thereof in its said transverse direction, for releasing said locking means.
15. In a telegraphonic machine including a cabinet, a magnetizable element and an operating mechanism: the combination of a magazine including said element and removable from said cabinet a handle on said magazine for mounting and removing the magazine into and from the cabinet; a control manlpulatable for disabling said drive mechanism; and means associated with said control and disposed adjacent to said handle in the path of the hand in taking hold of the handle. for causing said control to be operated and the drive mechanism to be disabled upon gripping the handle to remove the magazine.
16. In a telegraphone including a cabinet, and a drive mechanism in said cabinet: th combination of a magazine slidably mounted at least partially in said cabinet and including an electric circuit. connection between said magazine and cabinet serially including contacts on said magazine and cabinet respectively. said contacts engaging one another when said magazine is in mounted position; and means operatively interposed between said magazine and cabinet for disabling said drive mechanism in positions of said magazine relative to said cabinet wherein said contacts are out of engagement with one another.
l7. In a telegraphone comprising a cabinet: the combination of a magnetizable element, a magazine comprising said element and slidably mounted at least partially in said cabinet and removable therefrom; a control system for said telegraphone including control circuits between said magazine and cabinet, said control circuits including a bank of contacts on said cabinet and n COlI'U'DOLldlIl", bank of contacts on said magazine, the contacts of said first-mentioned bank being engaged respectively with the contacts of the other bank when said magazine is in mountcdposition relative to said cabinet; and means operatively interposed between said magazine and cabinet for disabling said control system against operation in response to shorting oi the contacts of said first-mentioned bank while son magazine is out of mounted position.
1'3. In a telegraph-mic machine including a cabinet. a magnetizable element and a drive mechanism for said element: the combination or a magazine including said element and removable from said cabinet: a handle on said magazine for mounting and removing the magazine with respect to said cabinet; a manipulatable control for said machine; and operable means coupled till with said control and disposed in the vicinity of said handle so that upon grippin said handle, by a single manipulation of the hand, said control is operated.
19. In a telegraphonic machine including a cabinet, 9, magnetizable element and an operat ing mechanism: the combination-of a magazine including said element and removable from said cabinet; an operable control for said machine; releasable means for holding said magazine mounted in relation to said cabinet; and means coupling said control to said holding means for causing the control to be operated as an incident of releasing the holding means.
20. In a telegraphonic machine including a cabinet, a. driven magnetizable element and a magazine containing said element and removable from said cabinet: the combination of an operable control for said machine; an operable latch for locking said magazine in mounted relation to said cabinet; and means, operatively coupling said control with said latch, for causing one to be operated as an incident to operating the other.
21. In a telegraphone including a magnetizable element and a reversible drive mechanism for said element: the combination of means movable to successive positions for reversing said drive mechanism; manual means for advancing said reversing means: locking means for said manual means. moved to released condition by manipulation of said manual means in a direction different from that of its effective direction of movement; and means for holding said locking means in released condition until said reversing means has been moved to a predetermined one of its successive positions.
22. In a telegraphone including a magnetizable element, a reversible drive mechanism for said element and a tone head means associable with different transversely-spaced lanes of said element: the combination of a unitarily-operable control means for said drive mechanism and tone head means; manual means for manipulating said control means; and means locking said manual means and moved to released condition upon manipulating the manual means in a direction different from its effective direction of movement.
23. The combination set forth in claim 22 including means associated with said manual means for disabling said drive mechanism when the manual means is in an unlocked condition.
24.111 a telegraphonic machine including a magnetizable element, a drive mechanism for said element and tone head means operatively associable with said element: the combination of an operable control for said machine; manual means for manipulating said control; means for locking said manual means against effective operation; and means effective upon manipulatin said manual means in a direction different from that of its effective direction of movement for releasing said locking means.
25. In a telegraphone including a magnetizable element, a reversible drive mechanism for said element and a tone head means operatively associable selectively with transversely-spaced lanes of said element: the combination of a unitarilyoperable control means for said tone head means and drive mechanism; manual means for manipulating said control means; means locking said manual means and rendered ineffective upon manipulating the manual means in a direction different from its effective direction of movement; and means operative upon said manual means being in unlocked condition for limiting the effective movement of the latter.
26. In combination, a magnetic recording assembly including drive means, electrical circuit arrangements controlling said drive means and arranged for the making of a magnetic recording, means associated with said assembly forming a socket for a magazine, a magazine containing a recording medium reinovably mountable in said socket, automatically-operable latching means to hold the magazine in the socket, push means adjacent the socket to release said latching means, and switch means actuated by said push means to open the circuit to said drive means.
RICHARD M. SOMERS. ROSCOE C. VAN CAMP.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,335,277 Heller Nov. 30, 1943 2,321,812 Heller June 15, 1943 1,237,496 Fankhauser Aug. 21, 1917 1,123,147 Sherman Dec. 29, 1914 FOREIGN PATENTS 15 Number Country Date 633,160 Germany 1936
US520508A 1944-01-31 1944-01-31 Magazine type magnetic recorder and reproducer Expired - Lifetime US2422143A (en)

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US2488482A (en) * 1947-10-15 1949-11-15 David S Swarthout Recording and transcribing mechanism
US2514578A (en) * 1946-02-23 1950-07-11 Heller Sound recording and reproduction system
US2519597A (en) * 1943-08-06 1950-08-22 Freeman H Owens Disk record and film record sound reproducer
US2521476A (en) * 1946-05-15 1950-09-05 Freeman H Owens Disk record and film record sound reproducer
US2535497A (en) * 1946-04-12 1950-12-26 Brush Dev Co Limit control for magnetic recorders
US2542506A (en) * 1948-09-13 1951-02-20 Jefferson C Gibson Magnetic recorder utilizing an endless record web
US2549038A (en) * 1946-08-16 1951-04-17 Armour Res Found Winding and reeling mechanism
US2563545A (en) * 1951-08-07 Sound recording and reproducing
US2572596A (en) * 1944-12-29 1951-10-23 Armour Res Found Magazine type magnetic recording and reproducing device
US2604547A (en) * 1949-06-24 1952-07-22 Will R Golden Automatic sound reproducer
US2609457A (en) * 1949-03-16 1952-09-02 Thurm Leon Electromagnetic sound recorder and reproducer
US2633503A (en) * 1949-01-12 1953-03-31 Armour Res Found Automatic stop arrangement for magnetic recorders
US2655863A (en) * 1953-10-20 Ticket control apparatus
US2658398A (en) * 1948-06-29 1953-11-10 Rca Corp Magnetic sound-recording and reproducing machine
US2661162A (en) * 1948-05-13 1953-12-01 Freeman H Owens Driving and locking means for apparatus having removable magazine
US2702833A (en) * 1948-01-26 1955-02-22 Armour Res Found Method of and means for making magnetic records
US2717282A (en) * 1953-07-15 1955-09-06 Int Electronics Co Equipment for use with magnetic tape records
US2726919A (en) * 1952-08-13 1955-12-13 Hathaway Instr Company Drum recording mechanism for oscillographs
US2743878A (en) * 1948-06-29 1956-05-01 Rca Corp Magnetic sound-recording and reproducing machine
US2952746A (en) * 1958-06-30 1960-09-13 Sidney O Sampson Automatic dual reproducing head for tape recording device
US3020360A (en) * 1959-01-29 1962-02-06 Gen Dynamics Corp Pronunciary
US3140359A (en) * 1959-07-07 1964-07-07 John N Rupard Plural track tape recorder
US3140360A (en) * 1959-08-17 1964-07-07 Singleton R Whitworth Multi-channel tape recorder and playback apparatus
US3477725A (en) * 1966-08-22 1969-11-11 Radio Mfg Co Inc Recording track indicating wheel for magnetic tape cartridge player
US3504133A (en) * 1964-07-24 1970-03-31 Clarke & Smith Mfg Indexing means for multi-track magnetic tape reproducing apparatus
US3532833A (en) * 1966-03-30 1970-10-06 Beltek Corp Magnetic head positioning and track indicating device
US3647986A (en) * 1969-12-29 1972-03-07 Motorola Inc Track indicator for a tape player

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US1123147A (en) * 1908-11-21 1914-12-29 John C Sherman Instrument for magnetically recording sound vibrations.
US1237496A (en) * 1911-06-08 1917-08-21 Charles K Fankhauser Telegraphone.
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Cited By (27)

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Publication number Priority date Publication date Assignee Title
US2655863A (en) * 1953-10-20 Ticket control apparatus
US2563545A (en) * 1951-08-07 Sound recording and reproducing
US2519597A (en) * 1943-08-06 1950-08-22 Freeman H Owens Disk record and film record sound reproducer
US2572596A (en) * 1944-12-29 1951-10-23 Armour Res Found Magazine type magnetic recording and reproducing device
US2514578A (en) * 1946-02-23 1950-07-11 Heller Sound recording and reproduction system
US2535497A (en) * 1946-04-12 1950-12-26 Brush Dev Co Limit control for magnetic recorders
US2521476A (en) * 1946-05-15 1950-09-05 Freeman H Owens Disk record and film record sound reproducer
US2549038A (en) * 1946-08-16 1951-04-17 Armour Res Found Winding and reeling mechanism
US2488482A (en) * 1947-10-15 1949-11-15 David S Swarthout Recording and transcribing mechanism
US2702833A (en) * 1948-01-26 1955-02-22 Armour Res Found Method of and means for making magnetic records
US2661162A (en) * 1948-05-13 1953-12-01 Freeman H Owens Driving and locking means for apparatus having removable magazine
US2743878A (en) * 1948-06-29 1956-05-01 Rca Corp Magnetic sound-recording and reproducing machine
US2658398A (en) * 1948-06-29 1953-11-10 Rca Corp Magnetic sound-recording and reproducing machine
US2542506A (en) * 1948-09-13 1951-02-20 Jefferson C Gibson Magnetic recorder utilizing an endless record web
US2633503A (en) * 1949-01-12 1953-03-31 Armour Res Found Automatic stop arrangement for magnetic recorders
US2609457A (en) * 1949-03-16 1952-09-02 Thurm Leon Electromagnetic sound recorder and reproducer
US2604547A (en) * 1949-06-24 1952-07-22 Will R Golden Automatic sound reproducer
US2726919A (en) * 1952-08-13 1955-12-13 Hathaway Instr Company Drum recording mechanism for oscillographs
US2717282A (en) * 1953-07-15 1955-09-06 Int Electronics Co Equipment for use with magnetic tape records
US2952746A (en) * 1958-06-30 1960-09-13 Sidney O Sampson Automatic dual reproducing head for tape recording device
US3020360A (en) * 1959-01-29 1962-02-06 Gen Dynamics Corp Pronunciary
US3140359A (en) * 1959-07-07 1964-07-07 John N Rupard Plural track tape recorder
US3140360A (en) * 1959-08-17 1964-07-07 Singleton R Whitworth Multi-channel tape recorder and playback apparatus
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US3532833A (en) * 1966-03-30 1970-10-06 Beltek Corp Magnetic head positioning and track indicating device
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