BE433715A - - Google Patents

Description

       

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  Phonographic recording and reproduction The subject of the invention is phonographic recording and reproduction and more particularly machines and discs and other phonogram supports intended for office use for the dictation and transcription of letter memorandums, etc. ...



   The invention includes various features which are particularly useful from a dictation point of view as well as several features of more general application. in accordance with previous commercial practice, dictation machines are constructed to use wax phonogram support cylinders. These cylinders are expensive, bulky and fragile. Economy demands that the cylinders can be used again and therefore it is necessary to have a planing machine in order to remove the transcribed recordings and prepare the recordings.

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 cylinders for reuse.

   This machine involves an expense of additional equipment, time spent by the operator to perform the planing operation.
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 c: t r4nd definitively impossible to consult subsequently the recording disappeared by planing for a verification. The cylinders have an instance of planing oocu- can a place which is not negligible in the office.



  It is not practically possible to keep a large number of unplaned rolls with a view to building them; c, because this preservation would on the one hand ùnq4épenso out of proportion for the rolls and on the other hand a considerable place to keep them. . Cylinders must be handled with great care at all times, because of their extreme fragility. A blank or transcribed cylinder that is dropped is doomed to destruction, but the damage can be much greater if it is dropped. dropped an untranscribed cylinder
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 because of the loss of the txte which had been recorded there.



  The important aims pursued by the invention
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 consist in remedying the aforementioned drawbacks by an improved phonogram medium, not very bulky, incas-
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 sand, and so inexpensive that it can be filed in a file, if necessary, after it has been transcribed or possibly discarded without refilling it and by a recording and reproducing machine capable of operating with this improved medium. in an extremely efficient and satisfactory manner,
Preferably, the improved support has the
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 forms a disc, uq'in a flexible non-fragile material * des, * tined to receive a phonographic recording and whose thickness is not,

     no larger than that of a sheet of ordinary writing paper. Co disc has advantages
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 obvious from the point of view of its price # of its low volume

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 and etn iaaab.Iitâ but gives link to problem !:

   from the point of view of its use to 1 "recording and to J4 reproductions The dtoqqe this notch by I groove of recording * 'ment Phonographic which forms and tends to ne froi, & aort' 1 04t ',., Elé' poae to P14t "he ale pou so said @ fuoERne un t6nt Àaa pà4 an auffloante rigidity Poe trsuttet # é tm <9ffwrt oou're = bze and diMot d4ontret ,, m neaent à ga pointe talluato * He gives rise aaaai to difficulties at the point of mu of nottot6 of the genregatre "ment phoào @ qphilU @ 1 deune part because of the tendency that $ 41 posâs tea 'a, 3. # a and rbt3,

  oa # cte la mnôhina éu ismon 4tenrfçiptiemon% and to be part because of the tendency that # àl pogebde to easily appear in J'O according to <'# wa6jay # meà% ¯1O4 ## o% er (8% µyaes 40s foroea4 grains of the support gozt4o ouooptîble dittre placed in front of style * 1'.aa braits of the bottom el are l # r @ pIO6uo% ien donàon% ¯L16U 9u8a to çliffleult6ne Leu goals:

   lmportgatg poqzruivig by .1. * invention consist in remedying osa c't3, t'ftotLtsi Bu, nalqaoa mo% o, -The machine chosen as d8exeàplo comprises a mounting btaohge '. on which we can Introduce an àiwqne mînoeî flaxitaLe and dee eulete d2aManoen @ R%, sitars 1 $. you in front of the cave at a certain distance from the spindle seappLi4dant against the opposite facea% L disc and spinning around I * aze de la spindle * ba spindle is mounted on a carriage and is assembled so as to drive a screw. djv $ aaera, tmc2atda also on 10 carriages 1 * 0 disk rotation monvament is By her at the screw dî, 1. ¯ * cementa vis cooperates with an Lmmbile eniw is worth BOXL 9MQ! Ï with which we can put a prige or which

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 you can clear the via dialrancoment at will. );

  , or. that the half-screen is engaged with the advancement via, the carriage
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 receives movement in the direction of the axis of the feed screw and moves the spindle of the disc away from the dirt yen% rat- melaent of the disc so that the area of the disc which extends in the radial direction enters the spindle and disc drive cheerfulness is kept constantly under tension while the disc is being driven
A fixed style is mounted so as to act on the disc in the radial area of this disc under tension which
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 extends between the spindle and the point of contact of the disc and the sprockets, ent and very close to this point.

   The fact that the style acts on a portion of the record constantly under tension is very important in
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 view of the adjustment of the disc, as well as the application of a controllable driving force. Because the style is located in the immediate vicinity of the driving gaiety, the result is that the disc advances by passing in front of the style to be moved.
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 linear velocity substantially reduced and this point is important from the point of view of the uniformity of the distribution.
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 tition of the recording along the phonographic groove.



  The disc is supported for recording and reproduction on a fixed medium, aemî * oylindr: Lque and guides cooperating with it are intended to maintain
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 the disc in a position fully conforming to the shape of the curved support ,, This support device of the ¯
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 dleque is important at several points in the vm, the spiral-shaped recording groove is drawn from a point at the voliup of the center and propagates outward to the circumference of the disc.

   As the sillont progresses, Za dj'aque receives notches which constitute a large number of fines 0I141Üa

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 like, arranged in oroix with the radius which joins the axis of the spindle of the disc to the point of contact of the advance rollers and which are curved downwards on each side of this radius. The fact that the disc is thus kept curved and that the fine undulations exist has the effect of making the radial zone of the disc in contact with the spindle, the style and the advancement rollers quite rigid. This point is very important because one thus achieves a certain and suitable training of the disc as it passes in front of the pen.



   The curved shape of the support has the further advantage of acting in the manner 4! A brake on the diçque. When the drive rollers are pushed aside, the disc and the parts it drives, all of which have very low mass, instantly become immobile. The curved shape of the carrier has the added advantage of allowing the machine to be given a length in the horizontal direction much shorter than the diameter of a disc.



   The curved support also absorbs the folds formed by the disc and ensures the correct adjustment at all times of all portions of the disc.



     The recording opera% ion does not start exactly against the back of the disc, but at a certain distance outside this back - The central portion of the disc does not have nicks and undulations. stiffening it. However, according to one characteristic of the invention, on this central portion of the disc is fixed a paper label, which on the one hand allows to write notes relating to the recorded text and on the other hand serves to reinforce. oer this central portion of the disc to keep it flat and substantially more rigid than the surrounding area.



  In accordance with previous practice, each

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 disc a loose sheet of notepad, separate, but no means were provided to make this combination permanent.



   The machine also includes a means for removing the phonographic groove from the influence of external noises, such as scratching, background noises and noises generated by the vibration of the various parts of the machine. It is not possible to obtain a satisfactory ponographic groove, in a thin, flexible material, resting directly on a hard metal surface, without the patterns formed by the grains of the material which constitutes the support base. be born a background noise in the disc.



   To overcome this drawback, the machine according to the invention comprises a support in the form of an elastic cushion applying against the back of the disc.



   According to another characteristic of the invention, the elastic support is not located directly in line with the style, which on the contrary is applied against the portion of the disc which is in the state of tension, the disc being held in the gap between the support points of the support.



   At the time of reproduction, it is important that the material constituting the record cannot come into frictional contact, at its point of contact with the reproducing style, with any material underneath, as this friction would give rise to inevitably to annoying noises in the reproductive amplifier.



   This malfunction is avoided in the machine of the invention by allowing the support to roll freely in contact with the material of the disc.



   The machine preferably comprises an electrical recording device and a reproducing device.

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 electric with separate styles for each of these operations and separate circuits are established according to whether it is to record or reproduce. According to an araoteristic of the invention, this mechanism operates under the action of a single operating part or trigger which brings the styles alternately into the operating position and moves them away and causes a simultaneous and coordinated change of the connections. circuits, so you can automatically establish the circuit that suits each style.



  The electrical circuits preferably include piezoelectric type crystal translator devices, which are absolutely suitable for the purpose to be achieved, because of the driving power which can be transmitted to the recorder style and. of the delicate and preoise sensitivity of these devices to the action of the reproductive style, which can be obtained.



   According to another characteristic of the invention, the electrical part of the machine comprises an overload protection device which limits the amplitude of the electrical vibrations and consequently of the reproduced sound.



  This device preferably consists of a glow discharge tube induotively connected to the input of the recording circuit and to the output of the reproducing circuit. A circuit comprising a tube of this type has the characteristic property of not absorbing any energy in the primary or input circuit to which it is inductively connected to. unless and until the conditions in the primary circuit are such as to give rise to a voltage exceeding a defined value -But when this defined value is exceeded, the tube ignites and the circuit thus established significantly modifies the current which passes through the primary circuit to which the discharge tube is connected.

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  According to another advantageous characteristic, the machine comprises a compartment in which the discs can be stored. This compartment is preferably located in front and at the bottom of the main frame of the machine and is quite narrow.



  But it can however contain a very considerable number of thin and flexible discs, which due to their flexibility can very easily adapt to the curved shape of the compartment as they are inserted or taken out.



   According to another characteristic of the invention, there is a removable reference scale, cooperating with the spindle of the disc and indicating to the person who uses the machine the points on the disc where the various texts are recorded.



   Other objects and advantages of the invention will appear below.



   In the accompanying drawing, given by way of example only: FIG. 1 is a side elevation of the machine; Figure a is a plan view; Figure 3 is a side elevation of the left side of Figure 1; Figure 4 is a side vertical section taken on line 4-4 of Figure 8; FIG. 5 is a perspective view of the cam mechanism which causes the positioning of the reproducer and the recorder; Figure 6 is a side view on the right side of Figure 1 with the right side closure plate removed; Figure 7 is a side section taken on line 7-7 of Figure 8, viewed in the direction of the arrows; Figure 8 is a longitudinal section following

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 lines 8-8 of Figure 6;

   Figure 9 is a view similar to Figure 8, in which some parts have been removed, and which shows the carriage in a different position; Figure 10 is a horizontal section taken on line 10-10 of Figure 4; Figure 11 is a partial horizontal section of the machine; Figure 12 is a vertical section taken on line 12-le of Figure 18; Figures 13 and 14 are detail front sectional views showing the relative positions of the breeder's arm and its lifting arm; Fig. 15 is a partial horizontal section taken on line 15-15 of Fig. 16, showing the reproducer and recorder and their reversing mechanisms;

   Figure 16 is a side section taken along line 16-16 of Figure 15, viewed in the direction of the arrows; FIGS. 19 and 18 are views respectively analogous to FIGS. 15 and 16 and represent the reproducer in the operating position, the section of FIG. 17 being taken along line 16-17 of FIG. 18; Figure 19 is a view similar to Figure 18, but in which the parts have been moved to operate the recorder; Figure 20 is a partial side section on the right side of Figure 6, showing the parts in their operating position; Fig. 81 is a detail sectional view from above of the disc application roller;

   figure 22 is a section of a fragment of the roller

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 of Figure 21 and of a portion of the disc which rests on it; Figure 23 is a plan of the disc; Figure 84 is a sectional detail view of the device holding the disc united to the spindle, and Figure 25 is a circuit diagram showing the various electrical connections between the various parts of the machine.



   In Figures 1 to 4, the different parts of the apparatus are mounted and supported in a suitable manner in a box which comprises a rear wall 53, a bottom 54, a front wall 55 shorter than the rear wall. rière, a top wall 56 with a downwardly facing portion 57 and end walls 58 and 59. The upper wall goes from top to bottom at 60 (fig.

   1) so as to form a flat surface 71 located at a lower level and serving as a support for various control devices which seconnt described below. Likewise in Figures 1 and 2, the end wall 58 is lower than the end wall 59, and at its upper level is a narrow shelf or bracket 61, fixed to the rear wall 53 and extending horizontally from so as to form a support for a hinged block 62 fixed to it by screws 63. A frame 64 having parallel arms 65 spaced apart from each other and at the outer ends of which is fixed a graduated scale 66 is hinged mounted on block 62 by supports forming hinge pins 67.

   To support the ladder, when it is tilted backwards on its hinges to introduce a disc, a support arm 68, directed backwards is fixed on the frame 64 and its lower end is curved so as to form a support 69 which comes in contact and rests on the block 62, when the scale

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 It is evident from Fig. 2 that when the ladder is sent back a large area is exposed at the top of the cabinet to insert a thin flexible disc 70, which will be described below. It can also be seen in Figure 2 that the flat portion 71 of the top of the cabinet extends to 72 and ends in 73, so as to leave a free space between it and the front wall 55.

   This space forms part of an opening or slot 74 which extends over the entire length of the front face of the box and serves as a store for the discs which have been used onon. The portion 72, which extends the top of the box also includes a window 76 through which passes a trigger 75 for operating an "open-close" switch 302 (see ig.25) and also supports an intensity adjustment button. 50 cover 74 passes between the corner posts 77 which rest on the end walls, and over the entire length of this opening the front wall and the bottom are joined by a thin concave band 78 which serves to guide the disc when 'we bring it into the store.



   The vertical portion of the store is delimited at the rear by a vertical wall 79, of convex shape towards its lower end and in front of the strip 78, and which is fixed in front of a wide horizontal platform 80, which supports the electric motor 40. and other parts of the operating mechanism, and extends to the rear wall 53. As can be seen more clearly in FIG. 8, the platform 80 is fixed and supported on a bar 81 of generally rectangular shape which extends trance versally over the entire length of the other end.



  The wider parts of the end walls 58 and 59 of the box are pierced with holes 83 allowing air to circulate.

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 and to the heat developed by the motor and amplifier which will be described below to dissipate. These perforated end plates are separated from the main solid portion of the cabinet and are held in place by screws 84 and 85.



  When inserting a disc in a vertical position in the slot or magazine 74, when its edge meets the concave strip 78, it slides along this strip and is guided in the horizontal portion 86 of the open space between the platform 80 and the bottom wall 54 of the cabinet. Preferably, fan fins 87 are wedged on the motor shaft, so as to create a circulation or current of air passing through the cabinet.



   As shown more clearly in Fig. 4, a thin, curved, metallic sheet 88 in the shape of a cross section of a turtle back serves to suitably support the disc 70 from below, the surface of which lower is applied with friction against this support 88, when the disc rotates.

   The turtle back 88 is supported forward, by its lower edge which rests on the curved portion of the band 79, a spacing oale 89 serving to keep these elements at an appropriate distance from each other. An angle bar 90 serves to support the lower edge of the turtle's back behind, a spacer 91 serving to keep it at a suitable distance from the rear wall 53. An angle bar 90 also serves to support an appliance. amplifier assembly 92 which is supported in the vicinity of its front part by a strip 93.

   As can be seen, the disc support 88 is roughly flat in the region of its top and lower ends and roughly cylindrical in the intermediate regions; along the top, it has a window 94 (fig. 2), which leaves

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 paaaerla broo4ô 95 of the Uqe oano.a disk 97 fixed on the atMfa-oa inér.ae of the wall 7% and 4 *, 4tod = t along * on "tz6etd aup6vUe aert ioootivet eg part of the stay before the appa 'and 86 4g dtaqae and as curved surface ers aero 96, oe trôare cae 4a *% 4noe etffjLs% e âe i'em 68
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 potr 6 them ttll ¯ 8R con-rue ommameLe "'àiijj / éÉÉàl> à sarbra 88Lr l3a" ¯Àµ. 8 1f zzi da jMtear 40 potta ine àoai *, on lqtr pao0e a couroje p9 which aappi.Qae on a lice;

   100 oai60 an voiasnqio "d¯, 1 * µ% réa% µ â:, isn rbxa 101 poriint à son, mr & 414, at6rîoue uno zous àien% ràfInonenù by frioUos oq Eglot <'µvùùoenhn% ciu, a * app.Uc4l di. raQfimant¯ o against I have toeoo 4nt4rïoq "in 9 fear you made toamay. An oloiaon 105 al'6tond an tr4vore dn box aiz shutter'nage deuge etrmi'tn dà "o reneter dtW4e aes e #% rÀwµ% Çf eat p #> q6e a window 10qQµ = at ttaTere mgwlzo passes JU.ta'ement 3Lt 101 qai repeae isar 440 pure do] Pett jt of scope 10 & "qgpAe4ea et aoltdalrou 41 = 0 ooamio ± TU support tee, exeo cotporte4at de = pa-feis 46 bizut pa, rct.e 106 e ji.0" ùi µg40Y life i. ' rrïéa âa Ggf (kOE whose m @ µ la poeài lo6j S'Gppl # qQO against the clotaen g03 and 1- $ atltre7 # n wall 1074 is perche dnna covertara 06 jLaisst paar 11 # reaùé one barrot% ffiJÇ eoUëaijco fa axtett da 4i @ gpoE * ,, 't ga;

  Shows it in figare la aonsole 10e o *% par (100 brgroe po µ profil en isita4eg in front of 1? Una do latttea and by a barra til'ar, ia g% 0n * 'La ahai.ét ,. diaq "eat zizi by a pg1ea of ùiee0 '4w "id8 and 53 (figt9 lane
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 daa eel ** 4t, 6 * of the bgrre aï. çapprt6o Sana lu p <$ J * oi 'y "'". ,.> r- "t57" - '-.- "µ :. de bottt loo had the other 4aDo' un, bo #> il $ k 4ene oonse .m aye to v4.af.J ia extra d1 box.

   The steric extract, da i * ii, gr 5 carried by the o <MMla 1 and not eoEtrâait6 3ariu by 1s oenaele 19S <

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 The carriage of the disc takes a US cadra, fixed on J.'exm3, tee of 81 \ 1013 .. of a hollow bar It9 and an arm 113 directed downwards and fixed on its extracted from the right side, a shaft 114 resting in the staves in the frame 112 and in the arm 113 and being threaded over its entire length between these staves.

   As shown in figure
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 4, the rod 52 passes 4an8 ane enooohe 11S & â l.:2ex1ïréll1tê lu- téi "of the oae.112 and the rod 5Ly through the trea pierced in the vicinity of its aO" 1; {of: raçon to support and to settle the frame and the bound 51 also passes through -a rub drilled in the
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 US arm in the neighborhood of its 801ll1et. so as to support and cheer him up. In its crolane portion, the ILS frame serves as a housing for a toothed wheel 116 wedged on the screw shaft 114 and meshing with a helical wheel 117 wedged on
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 pin 95 of d1.qa.

   To one of its eX1; 1'6811; 6. the frame 118 has two bases 118 because of which fixed by aims .20 the extrtSm1téa of a bed pushing element arranged 1ira.USTersal eaen1i. The extréalt6 of the threaded shaft 114 has a shallow cavity into which it fits.
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 p1iqu. has a steel ball 131 which also rests on the center of the Ilet element so that the movement along its axis of 1..qarbra threaded bzz is transmitted by the Miss to the oba-m riot of the disc * To print the movement solvent its axis to the threaded shaft 114, when the disc spindle and the
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 gear wheels 116 and him.2] Rotate it, an arm 122 is wedged on a shaft 123, which can receive a small rotational movement by means described below,

     and the end of the arm 122 comprises a threaded portion 124,
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 which can 'Hn1r J engage the thread of shaft 1144 when these threads are required, arm la? plays the role of a fixed nut, causing the following tree 114 to move
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 its axis. A baud spring 124, attached to the end

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 of the arm and on a fixed pin 125, tends to bring the arm into engagement with the shaft 114, (see fig 7). A short window 126 (fig. 7 and 8) drilled in the support 88 of the disc allows the wheel friction 102 to protrude slightly to rest against the disc.



   If we refer particularly to Figures 7, 8 and 11, we see that a frame 126a is mounted oscillating on a shaft 127 and comprises a transverse bar 128a with spaced legs 128 in which is mounted a shaft 129 carrying at one of its ends a friction roller 130, mounted so as to bear against the upper surface of the disc 70, directly above the roller 102. This shaft is driven by a friction wheel 130 ', arranged so as to bear against the hub 101 "of a pulley 100, the peripheral portions of the wheels 102, 130 and 130 'preferably being made of rubber.

   An arm 131 bent as shown in Figure 9 is fixed to the bar 128a of the. frame 126a and a coil spring 132 is attached by one of its ends to this arm and by the other an ankle 133, carried by a console 134, fixed against the rear wall of the cabinet.



  When it is not desired to rotate a disc, the parts are in the position of FIG. 7, the roller 130 is raised above the disc and the wheel 130 'is not in contact with the control hub 101' . As can be seen, a vertical arm 135 is located on a shaft 135a which carries a toothed wheel 136 meshing with a toothed wheel 137 wedged on a vertical shaft 138 supported by the console 134, fixed against the rear wall 53.

   The shaft 138 passes through the upper portion 71 of the cabinet and has an operating handle 139. When the handle is in the neutral position of Figures 1, 2 and 7, the arm 135 serves to keep the roller 130 raised, so than the disc

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 is not trained; when pushing the handle 139, Drinks in the without of the arrow f1 to record, or in
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 the direction of the arrow fa to reproduce (see ti8, 2 the arm 135 goes up as in figure 209 by allowing the spring 133 to lower the wheel 1Ô0t. and keep it in contact with the means 101 "and strongly apply the ta - let 134 against the disk which is alora in% mined by ego lets 169 and 7ï.3t.



  To allow 1-2operator to stop easily A disc at any time regardless of the handle T.38 an arm pointing upwards 140 is attached to the bar 128a of the frame i26, $, and a button 141 (fig 7) attached to 1 "axis of a flexible wire 142i enclosed in the ordinary flexible sheath 142 'intended to come into contact with the arm 140.

   An arm 143 protruding from the wall
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 inside the cabinet serves to support one end of the wire 142 * The other end of the wire is attached to a plunger 144 terminated by a button 145, and which can slide in
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 on housing 146 coxportemt donkey handle on, ohsfie 147 and a notch to befonnette 1486 A compression spring 149 which is applied against
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 the bottom of the casing 146 and the end of the plunger 144 tends to push the wire 143 back into its outward position, allowing a roller 130 of 82% to be released from the disc.

   To stop the discs, it is enough for Itoperatour to apply the button 145 * which has the effect of pushing the arm 140 backwards by the button 141, thus lifting the idle roller.
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 1SO. bayonet yeaaoahs 148 is cut from the housing 146, in which one can raise and rotate slightly
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 a lug 151 when leop6ratour wants the roller 130 to remain raised for a certain time.



     Disc and fixing, of this disc.

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 Tip 93ot zet it is seen that the pnonogram support 70 a circular disk or disc in a.n.u.e thin to flUna mflùiènoJ $ 'than 14ne4tate cellulose pzdtê- rent which is transparent.

   We noticed that '$' for not serving dana.!,? m & o6iine one obtiogt dWa results attstai santg) Airec ono toi4lle of an equal sum of 0, .ï jnn4 for sxraÇa.'rer H atoyen of microphone a, 3aif quê for rero4, daire. these 4iq, gqÀ; do you see that very little room to be gouperv4w 1- are very riqxiùLfi * and faoi1eS to be introduced and kept in? 14 tahinex a; Lnaî jus <it was described pr6o6d = moves. 4y ttpagey the two çpaù4 in digque are 1 $ aàea, the si-Hon asna8 Qat tree6 at the moment of the infegiatreent has the effect of deforming OR creasing the disc that 9Oaae thus of your plan.



  We found near this oasaia that it was advantageous to puncture the surface of a disne mne entiche qlng, as a wax high melting point in a 130iatton of j4% iiiahlora of carbon dries very quickly: this layer serves as a block,: laughing year 9, tYle engraving the groove in the dobby da di <qu1 We can OU4OÔeC afaona toir4a6e d't3rlaaïLuLoaa and wax qni al * additional advantage resulting from the wax not easily rubbing and the obaleur released during The registration opera- tion is to put the oireax lubricant on LiCtd.



  A disc of paper 15a is glued on the face UQP4 "laughing dü-disrna-0 ru against and allows 4y inaorire of the indioationa on the subject of a text recorded on the d: La: - that. disc in the region where it is attached to the brocne. thus it can be seen in figure 33 1 $ 6 the plate and the diana are drilled by a hole having several protrusions directed inward 153 and giving it the appearance of a wheel to ' engtem6e *

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The disc spindle 95 has a shoulder or rim 154 on which the center of the disc rests. Just above this rim is a series of grooves 155 into which the projections 153 of the disc enter, so as to directly transmit the rotational movement of the disc to the spindle 95.

   A hollow socket or cap 156 rests on the upper perfect of the disc and is drilled with a hole in its upper part to pass through the end of the pin, which has a smaller diameter than the splined portion.



   A groove 157 is cut at this point in the pin and serves as a housing for two metal balls 158, with a view to fixing a cap. 159 at the end of the spindle; each ball is pushed by a lug 160 fixed to the lower end of a spring 161, the upper end of which is fixed to the cap by a screw or a rivet 162. This arrangement allows the cap to be easily removed. and a spindle disk.

   The cap 156 has an oonically shaped head 159 at its upper end, the point or top of the cone serving as a mark which indicates, in combination with the scale 66 (fig, a) the position of the text recorded on the disk. The recording apparatus forms a sound groove 163 in the form of a spiral on the disc, as described below.



   It is not necessary to use the hat. to hold the disc in place. The center hole in the disc is small enough that the disc is held by friction against spindle 95. However, the cap constitutes a convenient marking element, easy to remove to facilitate the assembly and disassembly of the discs.

  ',

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 Recording and Reproduction Apparatus - In Figures 15 to 22, it can be seen that an application roller 164 is pressed against the underside of the disc @ @ @ 70 opposite the style 165 of the recording apparatus 30 (see also figure 9). The roller 164 is mounted at the end of a shaft 166, rotatably supported in an element forming a bearing 167, rotatably mounted on an axis 168 carried by a tab 169 of the console 105.

   The shaft 166 has a groove (pin 21) in which engages a stud cut at the end of a screw 170, and maintaining the shaft in a suitable position in the direction of its axis The bearing 167 is drilled with a hole serving as a housing for an adjustment screw 171 which screws into a tapped hole in a tab 172 protruding from the console 105. Soft rubber cylindrical blocks 173 and 174 are disposed under compression as shown in Figure 21, so that by adjusting screw 171 the position of roller 164 can be slightly altered relative to the styling.

   The roller 164 consists of alternating lamellae 175 and 176 of flexible rubber and aoier held in place against a flange 166a by a screw 177, which screws into the end of the shaft 166, and whose end widens to form a large diameter head 177a co-operating with the adjacent disc 176. A thrust ball 178 sits in a housing cut from. the end of the screw and is held in place by a spring 179, the end of which is fixed to the tab 172 by a screw 180. The style can be applied to the disc just above a 175 rubber slats back, to trace the sound groove there, the rubber allowing the lower surface,

   as well as to the upper surface of the disc to deform under the action of the style which traoe the groove by its lateral displacement.



  Figure 22 shows on a larger scale the hollows of the

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 groove on the upper surface corresponding to protrusions on the lower surface of the disc 70.



   As shown in Figure 11, the control shaft 135a, passes through the partition 103 and is carried by the end walls 106 and 107 of the console 105; it also passes through an oloison 182 arranged transversely on the top of the box.

   The end of this shaft supports a cam device 183 (see also figure 5) which determines the positioning of the recorder 30 and the reproducer 29. The recorder 30 is supported in its vertical movement by two substantially parallel arms 184 and 185, which are joined to it by screws 186 and 187 and the rear ends of which are supported in xotation by screws 188 and 189, which are screwed into a lug 188a projecting from the wall 182 ( freezes 15 and 16) and in a tab 189a of a console 190, mounted on the wall 182.

   The arm 184 carries a roller 190a which bears against a cam 191, forming part of the cam device 183 and having an upward portion 192 which moves the recorder up or down and a rest portion 193 of large expanse that keeps it in its raised or non-operating position. The parallel support rods are used to keep the recording crew in a position parallel to itself as it ascends or descends.



   The breeding crew 29 is mounted so as to move vertically and laterally, since it is attached to the end of a lever 194, having an offset extension 195, and oscillating freely on a shoulder screw 196, which screws onto the Inner end of another lever 197, itself rotatably supported, so as to move up and down and up and down, at one point.

 <Desc / Clms Page number 21>

 cylindrical length 198 (fig. 19) of its inner end, which is applied in a hole drilled in a portion forming a hub. of larger diameter 199 from the end of a third lever 200.

   A vertical screw 201 passing through a hole. drilled in the hub 199 and screwed into the fixed console 190 serves as a lateral oscillation support for the three levers. A spring 203 (fig. 17), one end of which is fixed to a pin 204a of the hub portion 199 and the other on a fixed peg 204, tends to push the levers towards the cam device 183.



  The levers 19? and 200 also include end portions, offset, respectively 205 and 206, to which are attached the ends of a spring 207. The cylindrical extension or. axle 198 is held in place in the hub. 199, for example by a screw 208 (fig. 15).



   FIG. 5 more particularly represents the cam device 183, which comprises an axial cam having an ascending portion 213 and rest portion 212 of great extent and between this cam and the cam 191 there is another radial cam comprising two rest portions of great extent. extended 209 and 210 joined by ascending portions 211. In Figures 15 to 18, it can be seen that the lever 200 carries a protruding lug 214 (fig.15) in contact with the outer rest portion 813 of the cam device. 183 and maintaining the reproducer in its non-operating position, while the recorder is now free to descend to its operating position.

   But if the cam device 183 is rotated counterclockwise from the position of Figure 16, the land 214 descends along the inclined portion 213 of the axial blade, the raised rest portion 193 of the

 <Desc / Clms Page number 22>

 The recorder control cam maintains the recorder in its upper non-operating position, while the reproducer is brought to its position above the duplication roller 164.

   During its movement, the lever 194 is supported by the lever 197, the end 205 of which facing upwards comprises a notch 215 in which
 EMI22.1
 rest the lever 194 (fi> 15), At this time, the spring 2.Q? is used to support the lever 197.

   when the reprocluoturn style is in place above the gslet 42applionticm 164, the asoendaate SU portion of the radial s-core comes into contact with a protruding pin 216 on the lever 197 µ the lever 200 having a notch 217 to allow passage this er- taste, The cam brings down the lever 197, against
 EMI22.2
 Inaction of the spring 207 * in the position of the fia14, d, 2 an amount sopérieore than that which is necessary to lower the style on the disc, so that the front part of the lever 194 does not rest any longer @ allo leanooche 315, Nais is free not to move vertically while the style is now resting on the disc.

   Fig. 18 represents the reproducer and the parts combined with it in this
 EMI22.3
 position. The operation described above is obtained by bringing the control handle 1S9 from its neutral position z (in its reproduction position (fig. 2).



   To return to the neutral position from the position in fig. 18, the control handle 139 is brought to its neutral position, thus rotating
 EMI22.4
 the shaft 35g in a clockwise direction (fig.



  18)! what has for and: tet to raise Is-erent 816 along the ascending portion 211 of its control cam, sounds the action of the spring 207, thus raising the style above the disc. The ascending portion 213 of the cam

 <Desc / Clms Page number 23>

 Axial then comes into contact with the lug 214, so as to move the lever 200 and the reproducer 29 laterally outside the path of the recorder 30.

   Instead of stopping the control handle in its neutral position (N) it is possible to continue its movement, until it is stopped in its recorded position by a stop 218 (fig. 2) When moving the handle from its central position, the roller 190 descends on the inclined portion 192 of its cam. From the position of Fig. 18 and the recorder comes to its operating position, its style 165 resting on the disc. Figure 19 shows the recorder and the parts combined with it in this position.



   To achieve a faithful sound recording in a tenacious material, it has been observed that it is necessary to use a recorder possessing a considerable power to train the style and that a crystal of Seignette salt (potassium-sodium tartrate) is necessary. the most effective agent for transforming the electrical energy of the output circuit of the amplifier into mechanical energy causing the vibrations of the style. Therefore, amplifiers of this crystal type are preferably used for recording and for reproducing and with these amplifiers preference is given to a diamond style, having received a shape suitable for the grinding wheel.



     It has also been found that background noise arises when the recording disc made of a plastic material is supported in front of the recording or reproducing style by a hard metal surface and this noise can be suppressed, as well as the vibration due to the operation of the machine is not recorded if there is an elastic cushion such as the application roller 164

 <Desc / Clms Page number 24>

 against the underside of the disc it has also been found that by supporting the disc so that the point where. The recording is carried out either in the voltage state, as will be described in detail below, the background noise is further reduced. These two measurements are taken in the machine described above.

   



   The use of rubber rollers to drive the disc is important because it prevents the transmission of machine noise to the disc material and the elasticity of the. rubber takes into account the difference in the surface path of the disc during its spiral movement.



   The drive mode has the effect of giving the disc a constant speed at the time of recording, regardless of the diameter of the circle * This gives a disc the important advantage of recording over a cylinder and the variations in the amplitude and frequency characteristics specific to recording on discs of other forms are eliminated.



   Another important feature of the described construction form is that the recording begins in the vicinity of the center of the disc which is reinforced by the label and which is an area of maximum resistance.



  The grooves are etched as the disc travels under the styling and serve to significantly increase the stiffness of the material in the transverse direction, as the distance between the wire drive and the disc spindle increases.



   By placing the recorder style slightly forward of the point of contact between the groove roller and the disc in the direction of rotation, a satisfactory recording can be obtained in the lateral direction of the disc material, while

 <Desc / Clms Page number 25>

 that if the point of the style is just above the roller from which it is separated by the disc, the engraving is limited by the edges of the groove of the roller The groove is engraved in the material and takes the shape of the diamond style without suffering the 'influence of the roughness of the walls of the groove which imprint on the back of the disc - This mode of operation is further favored by the fact that the disc continuously moves away from the drive rollers 102 and 130 ,

   by creating tension in the disc and helping to support it.



  This tension in the disc between the drive rollers and the disc spindle provides support for the disc in the lateral direction and the rollers provide support in the front. Under these conditions, it is not necessary to line the grooves of the application roller with rubber. to reproduce a recording, it is preferred to mount the style of the amplifier about 3 mm in front of the drive roller in the direction of rotation, the tension of the material of the disc being sufficient to support the reproduction. duotor, and no support existing under the disc just below the stylus contact point.



  Rewind Device - When listening to a record, you sometimes want to hear part of that record again.



  The machine has a reverse device which allows ironing under the style of one to three furrows.



  Referring to Figures 1, 2 and 15 to 18, we see that a vertical shaft 217 emerges above the top of the cabinet and carries a button 218, comprising a reference 219 that can be brought in front of divisions 0, ,, 1, 8 or 3 depending on the number of fins of the disc that you want to hear again, the mark normally being opposite the division 0. On the shaft 217 is wedged a game 220, which is applied against an ohe- ville 221, which can slide in a hole drilled in a

 <Desc / Clms Page number 26>

 bracket 22Ia of console 190. When the reproducer 29 is in the operating position, as shown in Figures 17 and 18, the end of the pin 221 is applied against the end of a screw 222 carried by the lever 200 in the vicinity of its lower end .

   By bringing the reference 219 in front of the division 1, we therefore rotate the eccentric 220 by about 60, and turn the lever 200 around its axis 201 by an angle sufficient to make the style return backwards. 'a groove or spiral of the disc.



   The spacing between the centers of the rubber sheets 175 of the application roller 164 corresponds to that of two grooves on the disc, so that the style of the reproducer now sits just above the following rubber sheet of the roller. as shown in Figure 15, the ends of the screw 222 and the plug 221 are not in contact when the breeder is in the non-operating position.



    Switching control - The automatic control of the switches of the amplifier, the reproducer and the recorder is effected by the operation of the handle 139 which turns the shaft 135a as explained above. - dement.

   Referring to Figures 6, 9, 11 and 20, it can be seen that the shaft 135a carries three arms spaced apart from each other 135, 283 and 224, the arm 135 allowing the roller 130 to be brought. in contact with a disc @ a @ that was explained above. The arm 223 is in contact with an arm 225 spread over the shaft 123, so that as the arm 223 moves up or down from the position of Figure 6, the arm 122 lowers into the position. Figure 20, so that its threaded portion 124 meshes with the screw 124, so as to move the disc carriage,

   as it has been explained. The arm 224 carries an ankle in

 <Desc / Clms Page number 27>

 projection 286 which is applied against one side 4 'of a window 227 cut in the vicinity of the end of a switching control lever 228, mounted loose on the shaft 123. The side faces of the window 227 are curved outwards down, as shown in dotted Figure 6, to allow shaft 135a to continue to rotate, after lever 228 has fully moved. A window 229 is cut in the vicinity of the shaft. lower end of lever 288 and into this window penetrates a pin 230 fixed on an arm 23I wedged on the end of the switching shaft 324.

   The parts are arranged so that, when the handle 139 is moved from the neutral position to the reproduction position, the pin 226 moves the upper end of the lever 228 to the right (fig. 20), hence The peg 320, the arm 231 and the switching shaft 324 result in a movement to the left, which has the effect of coupling the reproducer to the amplifier via circuit connections described below.

   When the handle 139 is brought from the neutral position to the recording position, the upper end of the lever 228 (fig. 20) moves to the left and the arm 231 as well as the shaft 324 moves to the left. to the right, thereby connecting the recorder to the amplifier via the aforementioned circuit connections.



  Amplifier Circuit Connections - Figure 25 is a circuit diagram showing the circuitry connections of the device. The drive motor 40 can be plugged into an AC power distribution line M through an "open-close" switch. "302, this line M also supplying the amplifier tubes 335, 336 and 339 and the rectifier 301. The rectifier 301 supplies direct current to the circuits of the amplifier tubes by a filter circuit of a known type comprising inductors 303

 <Desc / Clms Page number 28>

 and capacitors 304. The current corresponding to the sound to be amplified is applied to the terminals of the primary winding 307 of an input transformer 306, the secondary winding 308 of which is connected to the grid and the cathode of the tube 335,

   as shown in the figure. This amplified current is transmitted by a resistance coupling of the plate circuit in tubes to the grid circuit of the next tube, the resistors 309, 310 of the plate circuit of the tube 335 being connected through the intermediary of the capacitor ZII , line 312 and resistor 3I3 on the grid and cathode of tube 336 A contact 314 movable along resistor 313 is used to manually control loudness, thus allowing the operator to operate the device with the sound intensity it desires to obtain the best results in recording as well as in reproduction.



  Resistor 315 and capacitor 316 pass the amplified current to the gate circuit of tube 337, while the current corresponding to the amplified sound or signal passes through primary winding 318 of output transformer 317.



   As shown in the figure, transformer 317 preferably has three secondary windings 319, 320 and 322, winding 320 being connected through resistors 321 to the two electrodes of a neon tube 323 operating as automatic sound intensity control apparatus, as will be described below.



  One of the ends of the secondary winding 322 is connected to one of the terminals of the recording device 30 via a resistor 343 and its other end to a switch contact 342 on which can be applied a blade of switch 327, carried by a switch control shaft 324. The ends of

 <Desc / Clms Page number 29>

      secondary winding 319 are connected to a pair of switch contacts 341, to which are applied switch blades 325 also controlled by shaft 324. Switch blades 325 are connected to the terminals a jack 326, in which you can insert plugs 331 or 332.

   Jack plug 331 as shown is joined to the ends of a telephone listening coil 333 and plug 332 to a device 334 functioning either as a loudspeaker or as a micron voice transmitter. The high voltage terminal of the reproducing apparatus 29 is connected to a switch contact 344 on which can be applied a switch blade 328 also joined to the shaft 324, and which serves to complete the through circuit. by the transmission line 312 in the position shown.



   With the switches in the position shown, the sounds received by the microphone 334 can be recorded by inserting the plug 332 into the jaok 326 after having formed the switch 302 by the trigger 75 of the "open-close" switch located on the switch. top of the cabinet. The current corresponding to the sound waves passes through the primary winding 307, is amplified by the tubes 335, 336 and 337 and transmitted to the recorder 30 by the secondary winding 322 of the output transformer and the switch blade 387.

   The result is that the style of the recorder comes and goes sideways and traces a groove in the disc corresponding to the sound waves. By forming the groove, the style only moves the material of the disc, that is to say that this material is not detached, as by a cutting action. It has been observed that, if we mount a discharge tube containing for example neon or argon, as shown in the figure, when the microphone receives sounds of very

 <Desc / Clms Page number 30>

 At high intensity, a gas or incandescent discharge occurs in the tube, accompanied by a noticeable drop in the voltage applied to the recorder.

   On the contrary, low and medium intensity sounds do not generate sufficient voltage for discharge to occur in tube 323, so the total amplified voltage corresponding to these sounds is applied to secondary winding 322 and to The recorder. The discharge tube therefore serves to limit the amount of energy applied to the recorder, coming from extremely intense sounds, while that which corresponds to sounds of low or medium intensity is not limited, but applied in full.



   To record a message transmitted by a telephone line, the plug 331 is introduced into the jaok 326 and the coil 333 is placed next to the line and it is induotively coupled with it as soon as possible. the currents induced in the listening coil are then amplified and recorded in the manner described above.



   To reproduce the sounds recorded on a disc, the handle 139 is brought into the play position thereby bringing the playing style into contact with the disc and thus rotating the shaft 324 clockwise ( fig. 25), which disconnects the recorder 30.The switch blade 328 applying to the contact 344 causes the application of the output voltage of 29 to the grid of the tube 336. Voltage is amplified in tubes 336 and 337 and is transmitted to switch terminals 341 by primary and secondary windings 318 and 319.



  As the switch blades 325 are now in contact with these terminals, the sounds, as they are reproduced, can be heard in the speaker 334 whose plug 332 is inserted in the jack 326.

 <Desc / Clms Page number 31>

 switching device is so arranged that one employs
 EMI31.1
 three stages * of expansion for the sounds to be recorded, while only two stages are used to reproduce them.



  It should be noted that handle 139 not only
 EMI31.2
 brings the monkey or breeder into a dark position but still makes the appropriate connections to the damping circuit to achieve the desired degree of leeuregiatrempnt or breeding amplification. the intensity control base 514 is actuated by means of a bcuton 50 located on the top of the box and
 EMI31.3
 joined to this arm: by a flexible transmission 232 (fig.6) * Of course the invention is in no way limited to the mode d2executiou shown and described which was chosen only as dex9mPlu.



  8IC9,1'I014: L - A pnonotraduotear apparatus comprising in combination a device for controlling a phonogram support rotating and simultaneously moving a flexible disc.
 EMI31.4
 ble # a device bending this disc in a continuous manner, during its, rotational movement and in a fixed style applied to the surface of the disc.
 EMI31.5
 



  2 -'A phonotraduotéur-i according to claim i dan9 which the device bending the dis4m comprises! a fixed curved support for the disc and a guide device cooperating with the support forcing the disc to conform to the contour of the support;
 EMI31.6
 3 - A device. phonotransformer, according to the claim in which the device moving the comoo disc carries a central spindle, a device maintaining a central portion of the disc in contact with the spindle,

 <Desc / Clms Page number 32>

 a device rotating the spindle and a screw actuated by the spindle used to move it.
 EMI32.1
 



  4 - A phonotradtictor apparatus, according to ravendia- tion 3, in which a carriage is provided for the spindle and the via controlled by the spindle and which further comprises a member fixed with respect to the movement along the axis of the via and comprising a threaded portion and a device bringing said threaded portion into engagement with or away from the via.
 EMI32.2
 



  5 - a phonotradnoteurs apparatus according to resale 1o & ", tion 3, in which the support member cohorts an elongated window through which the spindle passes.
 EMI32.3
 



  6 - A phonotradnotear apparatus, according to the revon4µ - tion 38 in which the device making the di.que turn comprises rollers à90nùrafnown # ù by tritione it6s one in front of one another. in contact with the upper and lower surfaces of the disc and a turn controlling one of the said rollers.
 EMI32.4
 



  7 - A phonotradiiotour apparatus, according to claim 3, which further comprises a device bringing the roller
 EMI32.5
 of friction which is not controlled by the motor in contact and out of contact with the disc at a point which is opposite where the roller controlled by the motor is in contact with the disc.
 EMI32.6
 



  8 - .a phonotradaotear apparatus, according to xevend1oa-% ion 1, qt11 comprises separate recording and reproduction styles and in addition a single control device selectively and alternately bringing the two styles into contact with the disc.
 EMI32.7
 



  9 - A phono1iraduoteu apparatus: r; solvent of claim 8, in which the com style control device
 EMI32.8
 wears a cam device causing 12 one of the styles 1 spreadD1o laterally out of the path of the other style oi

 <Desc / Clms Page number 33>

 bringing down this other style in contact with the disc.



   10 - A phonotransmitter apparatus, according to claim 9, in which the cam device has a radial blade controlling the recording style, an axial blade controlling the reproduction style and a common control shaft of which the two cams are united.



     II - A phonotransformer apparatus, according to claim 1, in which an application roller comes into contact with the faoe disk of the style and has a peripheral portion formed of an elastic material in contact with the disk;
12 - A phonotraduoteur apparatus, according to claim 11, in which the application roller comprises several discs formed of an elastic material separated from each other by discs of a rigid material;

   
13 - A phonotransformer device, according to claim 12, which further comprises a device for adjusting the application roller, so as to vary its contact with the disc 14 - A phonotransformer device, according to claim 13, wherein the applicator roller adjuster comprises a pivoting support the axis of which is directed approximately at right angles to the axis of the applicator roller
18 - A phonotraduoteur apparatus, according to claim 2, which further comprises an ohassis on which are mounted the curved support of the disc and the device for controlling the disc, and a box separate from the ohassis and cooperating with it to form a store used to keep records
16 - A phonotraduector apparatus, according to claim 15,

   wherein the cabinet has a bottom wall at a distance from the lower surface of the chassis and

 <Desc / Clms Page number 34>

 a front wall at a certain distance from the front portion of the frame and having a concave portion adjoining the bottom wall, so that the end of a thin, flexible disc introduced into the space which separates the front wall and the frame curves when entering the concave portion of the front wall to enter the space that is along the bottom wall.



   17 - A phonotraduoteur apparatus according to claim 3, which further comprises a graduated scale in the vicinity of the spindle, the end of which has received a suitable shape so as to constitute a mark cooperating with said scale.



   18 - A phonotraduoteur apparatus, according to the claim 8, which comprises in combination an organ supporting in a movable manner the reproductive style and a device for returning to the rear moving this organ so as to move the style in the radial direction of the disc, following a backward path equal to the pitch of the disc groove.



   19 - A phonotransformer apparatus, according to claim 6, in which the friction rollers drive the spindle through the disc, the translational movement of the spindle away from the point where the rollers are in contact with it. the disc to keep in tension the portion of the disc between the spindle and the friction rollers and in which the styling is applied to the disc at a point between the spindle and the friction rollers.



   20 - A phonotraduoteur apparatus, according to claim 19, in which the style is applied against the disc in the vicinity of the friotion rollers, so as to maintain substantially constant the relative linear movement of the style and of the portion of the disc on which style applies.



   21 - A phonotraduoteur apparatus, according to claim 11, in which the style is arranged so as to apply to the upper surface of the disc at a slight point.

 <Desc / Clms Page number 35>

 
 EMI35.1
 row ahead of the contact point of the roller
 EMI35.2
 of application to the dioqt% çe in the direction of movement
 EMI35.3
 of rotation.

   
 EMI35.4
 t! n apparatus ph4nvtrxâttcteuari savant la oeevenài- ,, ¯ 'des - aatian.9', tti ecmpcrtaPeitîfn eoregietrear and repro- diactous pü'iaatawr with d2ontr6o and $ or- tie circuits, an area device coupling the reptodnattrdeentrde with the de. "apl.i'iaetsttr at the same time as the reproductive style comes into contact with the disc and disposes of." tif aoooplan the registered% 04 with the 4a exit 4th 1 * ampà% iyç% éxat en toffl dildo the engt.ytreur style comes in contact with the d, iac, aa.



  25 - An acaore process on an xpg, r4 disc. mins; rtç; ablo which consists in mounting the cumque in rotation around its center '@ to train the aiaqço by friction 4% toçw of its counter # to maintain the dàoi% e iloup tencion in the donkey located between its center and the point to enodnom # a4 W% oQé in the transverse direction to cate zoneµ to 610gnev progressively 1 *, axis of the tens of. point dentratnament t ra'x the 0113-one of the record in A point of this: neighboring sound da point âsa'xmai ', 8j? n sappojCt of virgin phonogcamma cinsifet = t on un d, aça Lp.aī Tt.'t in a tenacious, non-brittle material comprising qn troa central d.eatraom, i de f4: mo non circalairo.



  SS 9'n support of viergo- # eutviant resaleatian z4), 4on4 which the hole centered ;! deeetre; tue- 41GDLQrt9 çt4ir'ii'9J? iIt $ cloa, soq40 and des. f, .. 61i $ 36 * <A blank phonogram ttpor3.a; - according to claims 4ing #oqPel 'the central portion of the diaqne oexpozte uns tinotte paper glued On one side of this disc' ribs 4aàµàià?% e comprising tm hole central coïn <x) L- dant e '! a,; au, it diso #% i% µ ± VanÉ to be reinforced Us

 <Desc / Clms Page number 36>

 its central portion and to help establish a link
 EMI36.1
 d2outrainement between the disc and a rotating element of complementary shape.



   27 - A phonogram medium formed by the blank medium according to one of claims 24 to 26, the surface of which surrounds the ;, central portion of the disc comprises a corrugated sound groove obtained by the formation of ribs and alternating undulations on its two sides.
 EMI36.2
 



  28 - A phonotransmitter device comprising, in combination, an amplifier with input and output circuits .. a sound recording device, a device
 EMI36.3
 sound reproducer, a switch connecting 1 qenxegis treur to the output circuit, a switch connecting the reproducer to the input circuit and a control device
 EMI36.4
 single operating commutatouro * 29 - A phonotransformer apparatus according to claim 28, in which the Amplitioatour has at least three coupled dazpxifiaation stages, each having output and input circuits,

   and in which the common
 EMI36.5
 The generator uniting 12record is arranged in a circuit serving to connect the recorder to the output circuit of the third stage and the switch connecting the player is arranged in a circuit serving to connect the player to the input circuit of the second stage.
 EMI36.6
 



  30 - A phonotraduoteur apparatus, according to claim 29, comprising a current source of acoustic frequency, a circuit containing a third switch
 EMI36.7
 0 ,, "re the switches bringing together 1 $ record: aJeu.r and the reproducer, and serving to connect the source of current of acoustic frequency to the input circuit of the first stage and in which the single control device closes simul -
 EMI36.8
 the switch between the recorder and the

 <Desc / Clms Page number 37>

 
 EMI37.1
 third opener and opens the switch on the
 EMI37.2
 reproduoteur.
 EMI37.3
 



  15t - A phonotra & uotor device having the resale 2S, in which a discharge tube lwn1I1IU8e is a.ooa1Jl '1nduot1vlment at the exit outlet and is intended to light it
 EMI37.4
 when the current variations in the output circuit exceed a determined normal value.