US2293217A

US2293217A - Phonograph apparatus

Info

Publication number: US2293217A
Application number: US306244A
Authority: US
Inventors: Rieber Frank
Original assignee: MEMOVOX Inc
Current assignee: MEMOVOX Inc
Priority date: 1939-11-27
Filing date: 1939-11-27
Publication date: 1942-08-18
Anticipated expiration: 1959-08-18

Description

- Aug. 18, 1942. F. RIEBER I PHONOGRAPH APPARATUS 5 Sheets-Sheet 5 Filed Nov. 27, 1939 I'NV E N TOR.

I i7 Zkk/r 1 B W ATTORNEY Aug. 18, 1942. F. RIEBER I PHONOGRAPH APPARATUS Filed Nov.- 27, 1959 5 Sheets-Sheet 4 INK/EN Toni, magi/Z14 V- v M K O T. T A

Aug, '18, 1942.

RIEBER' PHONOGRAPH APPARATUS Fiied Nov. 27, 1939 5 Sheets-Sheet 5 ATTORNEY immediately precedingrecorded .matter;

Patented Aug. 18, 1942 j I UNITED 'JSTATE s- PATENT ori-" cs amen PHONOGRAPH minim Frank Richer, Los Angeles, Calm, assignor to Memovox', Incorporated poratlon of Ohio Cleveland, Ohio, a cor- Application November 21, 1939, Serial No. 300,244 9 Claims. (01474-13) This invention relates to the recording and reproduction of sound; and especially apparatus of the type that includes a stylus carrying head for embossing or cutting a record on a blank, forming a sound groove, as well as a playback or reproducer head utilizing a needle 'or stylus afiected by the record.

In general such apparatus is well-known. It

is one of the objects 01 this invention to improve apparatus of this character. 4

It is another object of this invention to im-' prove the quality "of recording and reproduction.

It is preferred to utilize, for the record carrying blank, a thin disc made from material that may be readily impressed by an embossing replane 8-4 of Fig. 2;

cording stylus. The record groove accordingly is in the form ofa continuous spiral of increasing radius as the edge or the disc is approached.

- It is clear that it the turntable that supports the record disc be rotated at uniform angular speed,

there would be a great variation oi linear speed from the inner to the outer edge of the record.

It has been proposed in the past, to drive the table plane 4-4 of Fig. 3;

Fig. 3 is a fragmentary view, similar to Fig. 2,

illustrating an alternative position 01' the appsview taken along plane Fig. '9 is a sectional view 8l of Fig. 2;

Fig. 10 is an enlarged sectional view,taken taken along plane along plane Ill-ll 01 Fig. 9; i

Fig. 11 is an enlarged iragmentary view of a portion of the apparatus illustrated in Fig. 8,

and disclosing the manner in which the nut for moving the carriage may be engaged and disengaged from the lead screw;

at a speed ensuring substantial linear speedconstancy, whereby the quality or the record is im--- proved. It is another object of this invention to provide an improved drive of this character.

It is another object of this invention to make it possible to interlink the motion of the reproducing' or playback head with that of the recording head, in a simple and eflective manner; and iurther to make it possible to adjust the lag of the reproducer head from the recorder head. In this way, whenever a playback is desired of 3c e playback head is in proper position to accomplish this result without the necessity of moving the head. w

This invention possesses many other advantages, and has other objects which may be made more easily apparent from aconsideration of one embodiment oi the invention. For this p pm there is shown a iorm in the drawings accom-j panying and forming part or the present specification. This iorm will now be'described in detail, illustrating the general principles or the invention; but it is to be understood that this detailed description is not to be taken in a limiting sense,

since the scope or this invention is best deilned a by the appended claims.

Referring to the drawings:

Figural-is a top plan view of an apparatus. incorporating the'invention; v

Fig. 2 is a sectional view," partly broken away, takenalong the plane.'2-2 of Fig. l; i L

Fig. 12 is a sectional view taken along the plane |z of mg. 11; a

Fig. 13 is a side elevation of the nut structure is; seen along the direction of arrow ll 0! Fig.

Fig. 14 is a sectional view, taken alongplane Fig. l5'is a fragmentary sectional view, taken along plane li-il of Fig. 14;

Fig.1.6 is an end view of the reproducing head s pportm Fig. 17 is a sectional view, mainly diagrammatic, taken along plane il-- ll 01 Fig. 2;

Fig. 18 is an enlarged fragmentary plan view of a part of the apparatus illustrated in Fig. 17;

Fig. 19 is a sectional view, taken along plane ll- -ll of Fig. 17,;

Fig. 20 is a fragmentary top plan view of a part or the apparatus illustrated in Fig. 1; and

Figs. 21 and 22 are fragmentary detail sectional views taken along planes I l-Ii and 22-42 respectively of Fig. 20.,

The phonograph apparatus may be provided with a turntable l. shown in this instance as mounted for rotationon a vertical axis and supporting a thinrecord carrying disk I. Thus for example as shown most clearly in Fig. 10, the turntable I, may be. fastened as by the aid or a set screw 3 to the upper end ot the spindle 4.

This spindle 4 may be appropriately supported in spaced ball bearingstructures I and I. The upper ball bearing structure 8 for example, may

haveits inner race against a'shoulder on section, taken along .cap l8 (Figs. 1, 2, 6, 9 and 10).

the spindle 4. Its outer race may be accommodated within a boss 1 that may be formed three spaced framemembers 9, I and H (Figs.

8 and 9) forming the main support for the apparatus. These frame members may be ribbed 'or otherwise reinforced castings, joined together as by a seriesofbars |2, |3 (Figs. 2, 6 and 8), which pass through appropriate apertures in all three frame members, and adjacent both the right and left edges of the frame as viewed in Fig. 2. These bars l2 and I3 are shown as round in this instance, and as clamped between'the split ears |4, |5,-provided in each of the frame members 9, l0 and The top member 2| (Figs. 1, 6, 9 and 10) may overlie all of the three frame members 9, I0 and H and may be appropriately fastened to the upper coplanar surfaces of these frame members.

The lower ball bearing structure 6 (Fig. 10) for the spindle 4 is shown as having an inner race, held against a shoulder on the bottom of the spindle 4 as by nut I6. Its outer race is shown as accommodated in a boss II, also formed integral with the intermediate frame member The record member 2 may be of the form described in .a prior application filed in the name of Frank Rieber, on September 19, 1939, having Serial No. 295,613, and entitled Sound record carrier. This record disc" 2 is shown as held in place on the table I by the aid of a button or The button l8 may have a comparatively wide flange I!) to which are fastened one or more pins These pins 20 extend downwardly through matching apertures in the record disc 2 and in the table The manner in which rotation is imparted to spindle 4 will be described in detail hereinafter.

A recordinghead is utilized for the recording function. .The structure of the recording head is shown to bestadvantage in Figs. 1, 2, 5 and 9.. This recording. head includes a stylus 22 adapted to contact with the record disc 2. It is the screws 32 (Figs. 2 and 8) which pass through a flange on the bottom of the downwardly ex tending column 33 of the support 21. This column is shown as passing downwardly through the slot 34 in the top member 2| (Figs. 11 2 and 9).

The lower side of the carriage structure 3| may be provided with a plurality of rollers 35 freely rotatable on stub shafts anchored within ears providedin the frame 3|. These rollers engage the carriage guide rods 36, 31 (Figs. 1, 2. 8 and 12) that are fixed to the frame members 9, I0 and II. Three such rollers 35 may be utilized for this purpose; one immediately below the column 33, engaging the guide rod 31; and two spaced rollers at opposite ends of the frame 3|, and engaging the guide rod 36.

A constraint is placed against lateral movement of the frame 3| with'respect to the

guide rods

36 and 31. Thus forexample, the ear 38.

, serving as a pivot support for one of the rollers shown as held within an electromagnetic recording unit 23, which may be fed in any appropria'te manner with electrical impulses corresponding to the soundsto be recorded. Since all this is well understood, further explanation of the operating parts of the unit 23 is unnecessary. The stylus 22 may be arranged to form either a lateral or a hill and dale type of record.

The unit 23 is shown as joined to a frame or body 24. This frame or body 24 is shown as pivotally supported between the

arms

25 and 26 of a forkedsupporting member 21. In the present instance this pivotal support is formed by the aid of a pair of balls 28 (Fig. 5) accommodated in cooperating shallow recesses formed on the sides of the frame 24 and on the inner ends of the pivot screws 29. The weight of the pivoted structure is purposely made such as to ensure a proper recording, effect upon the record disc 2, as by an embossing process.

The support 21 is arranged to be advanced as the recording progresses from near the axis of the spindle 4 toward the periphery of the record disk 2. This direction is indicated by the arrow 30 in Fig. 1. For this purpose the support 2'| is joined to a carriage structure 3| (Figs. 1, 2, 3, 4, 8, 9 and 12) This carriage structure, as shown most clearly in Fig. 8, is of triangular configuration. The support 21 may be attached to the top of the carriage structure 3| as by the aid of 35 that contactswith the guide rod 31, may serve as a support for a downwardly depending leaf spring 39, contacting the rod 31 and limiting carriage movement toward the left as viewed in Fig. 2. A similar spring restraint 40 may be utilized in connection with one of the rollers 35 that contacts with the guide rod 36; and a similar spring finger 4| (Fig. 12) may be utilized in connection with the other roller that contacts the guide rod 36. These

spring fingers

40 and 4| restrain right hand movement of carriage 3| as viewed in Fig. 2.

The manner in which the carriage 3| is advanced radially outwardly in the direction of arrow 30 may now be described. For this purpose there is provided a lead screw 42 (Figs. 8, 9, lland 12). This lead screw 42 is shown as having an axis normal to the axis of the spindle 4. It. is shown in Fig. 9 as being supported at its left hand end in a ball bearing structure 43. The outer race of this ball bearing structure is shown as supported in the boss 44 formed integrally with the side frame ID. The inner race of this ball bearing structure is held in place as by the aid of nuts 45 against a shoulder formed on the lead screw 42.

At its right hand end, as shown most clearly in Fig, 9, the lead screw 42 has a hollow extension 46' which serves to accommodate the inner race of a ball bearing structure 41. The outer race of this ball bearing structure is shown as supported in the intermediate frame I At the right hand .end of the lead screw 42 a gear wheel 48 (Figs. 8, 9 and 10) may be provided. This gear wheel 48' is shown as provided with spiral teeth adapted to engage the spiral pinion 49 mounted on the spindle 4. -Accordingly the lead screw. 42 is rotated from power de'rived from the turntable spindle 4, and the-angular motion of the screw 42 is proportional to the angular motion of the turntable By appropriate design of the pitch of the threads of. lead screw 42, and of the intermesufficient for thepresent to note that by virtue binding effect can result, since the connections permit asufficient degree of freedom ofmoveas Journaled within the hollow/extension 46 of joined by a yoke 52. These interrupted bands 50 and ii occupy different-angular portions of a complete circumference so as to engage the threads of lead screw 42 on diametrically OPPO! site sides thereof. In this way, a rotationof the .yoke 52 about an axis M radial to the axis of the screw 42, serves either to' engage or disengage f and II with respect to -vanced in accordancewith the motion of the nut structure,'a shaft 59 is fastened tothe yoke 52. This shaft is rotatable about the axis 52, as by being iournaled in a guide 54, fastened as-by screws 55 to a sloping face .56 on the frame 3L This guide 54 is provided-with side flanges for the accommodation of the fastening screws 55,

and overlies the aperture 51 (Fig. 12) in which i the pin 58 of roller is accommodated.

' The shaft 59 is provided with a collar 80 at its upper end. Interposedbetween the collar 60 and the guide 5415 a compression spring BI surroundproper contacts with the threads on the lead screw 42, and also permits thenut structure to accommodate itself accurately with respect "to the screw 42. I

The shaft 59 is resiliently urged in an angular direction to move the interrupted bands 50 and iii into engagement with the lead screw 42. This may be accomplished for example, by the aid of a tension spring". One end of this tension, 35 spring passes around a post 63 mounted near the edge of the collar 60. The other end of spring 62 may be anchored toa pln 64 attached to the frame 3|. v

Should it be necessary to disengage the nut structure from the screw 42, the shaft 52 maybe given a counterclockwise rotation as viewed from r the top. The 'manner in which this may be acof the resilient elements BI and i2, and by virtue of the angular adiustability of the nut structure about the axis 53, this nut structure can follow accurately the threads on screw 42, even if thereshould be some misalinement of the shaft 42; or even a slight bending of the shaft. No

.nection with Figs. 2, 3, 8 and 9. Thesource of power for this rotation may be provided for by a small electric motor 4!. (Fig. 8). drives, through appropriate gearing, a shaft 28. 50

This motor ,Thisshaft carries a sheave 81 joined as by the belt 82 to a corresponding sheave 69. As shown most clearly in Fig. 9,this sheave 69 is shown as mounted on shaft .Il-supported as by the aid of the ball bearing structure II in the frame member 8. The other end I2 of the shaft II is shown the lead screw 42. Thus the lead screw 42 and I shaft" are coaxial. .The shaftll carries a driving element or member II in the'form of a hollow metallic roller (Figs. 2 and 8). In driving relation with the periphery of roller II and with the under side of the table I is an idler wheel 14. This idler wheel may be provided with a resilient 7s 3 or rubber rim I5. It may project throughslot' It in the cover-member 2 I so as to enable the rim II to be placed in contact with the lower surface of table I.

As is apparent from a consideration of Figs. 2 and 3, the wheel I4 servesto transmit rotation from the roller II to the table I, when it is disposed in the operative position shown in these figures. This wheel 14 is mounted on the carriage II, so that as the carriage moves laterally, the wheel I4 contacts the table I at variable radii. Furthermore, as shown most clearly in Fig. 9, the wheel I4 is disposed immediately beneath the recording stylus 22. Since the peripheral speed of the wheel .14 is the same as the peripheral speed of roller I3, it is apparent that at all times the linear speed of recording is constant,

and may be chosen to be of the order of 6 inches per second, as referred to in the prior application hereinbefore identified.

' The manner in which the wheel I4 is mounted upon the carriage :II may be best explained in connection with Figs. 2, 3, 4 and 8D Thus the wheel 14 may be freely rotatable upon a stationary stub shaft I6, which is supported on an arm 11. This arm 11 is slidably guided in the spaced guides I8 "and 19 fastened to the top surface of the frame II. For this purpose the arm I1 is made rectangular in cross section. The wheel I4 is urged resiliently toward the right and into driving relation by the aid of a tension spring Ill. One end of this tension spring is anchored to the right hand end of the bar 11. Its other end may be anchored to an anchor pin 8| fastened to the carriage II. In order further to guide the movement of the bar .11, this bar may. be provided with a transverse slot 82 through which passes the screw 83, supported in the p 1 guide". Furthermore, near the left hand edge I of the carriage ii, a rest 84 in the form of a transverse pin extends across the guide II. When it is desired to disconnect the drive to the table I, the bar 11 ismoved toward the left, and it assumes the dot and 'dash position indicated in Fig. 3. The bar I I then rests upon the transverse pin 24, and the wheel l4'-is lowered out of contact with table I. Convenient means are provided for lifting the I recording unit or head 23 off of the disk 2, and

if desired also to stop rotation'of the tlu'ntable'l. This action may occur in sequence; that is, it

- is possible to raise the recording head without stopping the turntable, as for example when it is desired to operate a playback mechanism hereinafter to be described. Alternatively, however, it is possible to disconnect the driving wheel 14 so as to stop rotation of the table 'I. Optionally, also, it is possible to-cause disengagement of the nut structure III, 5| from the lead screw 42 to make it possible if desired to adjust-the position v of the recorder head 22 along thefrecord disc 2.

The mechanism for accomplishing these. eflects is shown to best advantage in Figs. 2, 5, 8 and 11. Thus there is a vertical shaft 25 Journaled in the: support 21 and capable of manual manipulation as by the aid of knurled head It. This shaft ll passes across a cavity or recess I! in the under side. ofthe support 21. To the shaft II are fastened the eccentrics-22 and II. The eccentric I2 is adapted to contact the rounded end of a push rod 22. This push rod II is slidably supported inthe rapport 21 and has an enlarged rounded and! This enlarged rounded end" acts against the inner-surface of an arm a: fastened to the frame 24 and projecting downwardly to cooperate with the member 9|. The weight of the pivoted

source

23, 24 acts to urge the push rod 90 against the periphery of the eccentric 89. When the eccentric 89 is in the position illustrated in Figs. 2 and'3, the stylus 22 is urged by gravity into contact with the disc 2. However, by rotation of the knurled head 86 the pivoted

structure

23, 24 is raised by the force exerted toward the left through the push rod 90 upon the shaft 91 are appropriately journaled in the end members of the column 33. Thus rotation of eccentric 88 thus rocks shaft 91.

Referring now to Fig. 8, shaft 9'! is arranged to operate a link 98'. This link-98 is operated through the crank 99 fastened to the shaft 91. The left hand end of the link 98 operates upon a, lever I pivoted on post IOI. The free end of this lever I00 is arranged t cooperate with a pin I02 fastened to the top of the bar 11. However, there is lost motion between the lever I00 and the pin I02 as shown most clearly in Fig. 8. In this way it is assured that the recording head 23 may be raised without placing the driving wheel '14 out of operative relation. Upon continued rotation of the button 86, however, pin I02 is contacted by lever I00, bar 11 is moved toward the left, and the wheel I4 is urged to the inoperative position indicated by the dot and dash lines of Fig. 3.

Upon further continued rotation of the button 86 it is possible entirely to disengage the nut structure 50, I from the lead screw 42. to accomplish this result, the crank structure 99 carries another crank arm I03 which operates a link I04. This link I04 is connected at its upper end to crank arm I05 (Figs. 8, 11 and 12). This arm I05 is provided with a hub I06 pivotally supported on a post I0! supported on top of the carriage IOI. When link I04 is urged upwardly upon rotation of shaft 9I, the upper edge of arm I05 contacts the pin 63 on collar 60. In this way the shaft 59 is rotated in a counter-clockwise direction as viewed from atop of the shaft, and the threaded interrupted

bands

50 and 5| are disconnected from the screw 52. When this is accomplished, the recorder head 22 may be moved along the record disk 2.

In addition to the recorder head-23 and recording stylus 22 there is provided a reproducing or play-back head I08 (Figs. 1, 6, 7, 9, 14 and 15).

This bracket III as shown most clearly in Figs. 6, '7, 14 and 16, is provided with a longi-" tudinal rectangular recess, for sliding engagement with a stationary rectangular guide bar II8. It is supported by aid of a round end I 20 within a slotted boss II9 (Figs. 6 and 7) formed integrally with a bracket I22. This bracket I22 is disposed adjacent. the frame member I I (Figs. 6 and 8) and is fastened to the frame structure'as by the-aid of the slotted ears I23 and I24 which embrace the frame bars I2 and I3. The upper end of bracket I22 passes through the slot I2I formed in the top 2|.

The left .hand end of the bar I l8 as shown most clearly in Figs. 6 and 7, is accommodated in a recess I25 of an end plate I26. It may be held in the recess as by the set screw I21 (Fig. 6). The end plate I26 serves, with a similar opposite end plate I28, to support a sheet metal cover member I29 (Figs. 1, 6, '7 and 14). This sheet metal cover member as. shown most clearly in Figs. 14 and 15, extends around the guide bar made of an eccentric rod I30 (Figs. 7,14 and 15).

Q ears II5, II 6, and pivoted thereto. The yoke I33 In order This play-back head as shown mostclearly in Fig. 1, is arranged to traverse the record disk 2 along the direction of the arrow I09 transverse to the direction of movement of the recording head 23.

The play-back head I08 may also be of the electromagnetic variety, having a reproducing stylus 0. This stylus IIO may be permitted at will to rest by gravity upon, the record 2. Thus for example the head I 08 may be provided at its rearward end with an ear III (Figs. 14 and 15). This ear III is attached as by a screw II2 to a downwardly extending post II3. This post in turn is attached to a cross arm II4. This cross arm is pivotally supported in the ears- 5 and I16 formed on a bracket 1. The weight of the head I08, thus pivotally supported, is sufficient to maintain stylus H0 in operative contact with disc 2.

has downwardly extending arms I34 having ends contacting the back surface of head I08. When the eccentric I30 engages the arm I32 and urges it downwardly about the yoke pivot, the arms I34 urge the head I08 in.a clockwise direction, as viewed in Fig. 14, and free of the record disc 2. The traversing motion of the reproducing head I08 is made to follow the traversing motion of the recorder head 23. This is accomplished by the aid of a flexible element, cable, or cord I35 (Figs. 6, 7, 8, 14, 15, 17 and 19).. The recording head or unit 23, as well as the reproducer head I08 are joined to' this flexible element. This element is guided by appropriate guide pulleys, supported on certain of 'the frame members.

Thus for example the frame member 9 (Figs. 8 and 17) is provided with an inte'gral'ear I35 supporting a stationary boss I31. A guide pulley I38 for the flexible element I35 is mounted for free rotation upon a stub shaft supported on the boss I31. Similarly, the bracket I22 is provided with ears I39 and I40, similarly supporting the guide rollers I4I, I42. The flexible element or cord I35 passes around the pulley I38 and to the pulleys HI and I42. These pulleys guide both reaches of the flexible element I35 upwardly through apertures in the cover member 2| on to the guide pulleys I43 (Figs. 6' and '7) mounted for free rotation in the bearing blocks I44 fastened to the lower surface of the guide bar II8. These pulleys I43 guide the reaches to a position on opposite sides of bar II8, as shown most clearly in Fig. 7. Horizontal reaches of the flexible element I35 pass around the terminal pulley structure I45 accommodated in theslotted end of the bar II8. One reach of the flexible element I35 is clamped to the reproducer head bracket III in a manner best illustrated by the aid of Figs. 14 and 16. Thus the bracket III is shown as having a slot I46 in its lower front edge; Across this slot the element I 35 passes.

in an arcuate recess I52 in the edge .of the supcommodate a plurality of turns of the flexible eleelement I85 is likewise .inoved through the medium of shaft I50 and wheel I58, and the res producing head I08 is moved coincidentally with-5 gq perating with the record, a carriage for I85 around pulley I88 moves that the lower reach of flexible element I85 as of the spindle I50. To facilitate this adjustment,

0 f2 and 18) having an arcuateedge cooperating with the head III. This headmay be provided 45 or jaw I4I contacting the lower side of the cable ,tion of flexible member I85 which passes over 30 the shaft I 50, the relative positions of the two viewed in Fig. 1, this rotation causes the-upper the record disc 2. A reverse direction of rotation of spindle I58 will obviously cause the reproduce! Fig. 1, and thereby to lag the recorder head 28 on the recorder disc 2. The amount of lag can 70 Engaging within the slot is a clamping member with an index marl; or arrow I58 to cooperate with the graduatlons.

By appropriate setting of the lag of reproducer head I08 it is possible to reproduce the imme- 5. diately preceding recorded matter at any time by simply lifting the recorder head 28, without or flexible element "5 and urged to clamping position as by the aid of the screw I48.

Accordingly when the cable or flexible element I85 is moved as permitted by the various guide pulleys, the reproducing head I08 is caused correspondingly to traverse the record disc 2. The ends of the flexible element I85 are shown. in Fig. 17 as being joined by the tension spring disturbing the drive connections as heretofore explained, and by dropping head I08 to active position. Then by appropriate electrical switching, the reproducer head I08 may be placed into electrical operation. During recording the reproducing head I08 may be raised by appropriate manipulation of the knurled thumb piece I 8|.

It may be required to make it possible to set The manner in which the recorder head structure 28 is attached to the cable element I85 is shown to best advantage in Figs. 17 and 19. There is a vertical spindle I50 jollsfnaled in the the reproducer head I08 so thatitcomplies with column 88 and capable of manna manipulation a desired portion of therecord disc 2. Logby the aid of the head I5I. This head "I, as gingcards may be used for this purpose, upon shown most clearly in Fig. 18, is accommodated which may be indicated the material that is recorded. Thus for example the reproducer head go bracket III may .have a projection I51 (Figs. 7, 14 and 15)- extending through a slot I58 in the guard member I28. Attached to the projection I51 may be a pointer I58. This pointer is intended to traverse a card [80 (Figs. 20, 21 and port 21. The lower end of spindle I5l carries a wheel or pivoted member I58 which may' have apair of annular grooves I54 and I 55. These grooves are each preferably wide enough to acment I85 in side by side relation. Groove I54 is in position to accommodate that portion of the flexible element I85 which passes toward the left from the pulley I. The level of the lower groove I55 is such as to cooperate with that porand corresponding to constant time intervals of the record. Opposite these graduations may be appropriate identifying matter to indicate what is recorded adjacentthese graduations on the recordcorresponding to the card 'in use.

The card I80 may be utilized, during the process of recording, for notations of the recorded material, since the the. top of pulley I88. The flexible element I85 is wound several times around the wheel I58 in groove I54, whence it passes from groove I55 to groove I54 through a transverse passage I55 passes around groove I55 in the same direction as in groove I54. The several turns of the flexibleelement I85 around the wheel I58 thus serves as a mechanical connection between the flexible element and the recording head structure. A0 cordingly when the recording head structure is moved by the lead screw 42, the cable or flexible The card I80 may be held approximately in place on an extended shelf I82 (Figs. 14 and as by the aid of several spring fingers I58, I 54. A comer guide I 85 may be provided for the lower comer of the card and an additional guide I58 at the lower right hand comer may be provided.

What is claimed is: a 1. ,Ina phonograph mechanism including a record, a recording head and a reproducing hea'd the-movement ofthe recording head 28.

Furthermore, by making it possible to rotate heads in predetermined relationship 'with'respect headswlth respect to the flexible element may be adjusted. For example, assuming that the head structure 28 is stationark'y, andi thtst the indie I is rotated in a cloc wise d rec ion as I 1 an as to cause the heads to move in tlally perpendicular to each other.

ea h of cable I85 as viewed in Fig. 17 to move I c 2. Ina phonograph mechanism including a toward the left. The lower reach of the cablev to'the right. Accordingly that portion of flexible element I85 which isengagedon pulley MI is pulled downwardly. Now considering Fig. 17, this means for'cooperating with the record, a carriage-for carriages to cause the associated head to move transversely ofthe record, means for moving one of said carriages on its guide, a flexible element connecting the carriages to maintain the heads in predetermined relationship with respect to the record, said guide means being so arranged as to cause the heads to-move in paths transverse .to 'each other, and means'operating upon said flexible element, for the heads.

seen in that flgure, moves toward the right, that l is, in a direction radiallyaway from the center of the turntable spindle. Accordingly a clockwise rotation of spindle I50 causes reproducing head I08, to be urged outwardly with respect to 5 head I08 to move toward the left 'as viewed in record, a'recording head and a reproducing head for cooperating with; therecord, a carriage for each of said heads. guidemeans for each of said carriages to cause the associated head to move transversely of the record, means for moving one of said carriages on its guide. a flexible element be adjusted by manipulation of the head "I use may be made of "a graduated plate I51 (Figs.

25 22). This card I is shown as provided with graduations III cooperating with the pointer I58 pointer I 58 also corresponds, connecting the two grooves.. The element I 85 to the position of therecorder head-28.

to the record. said guide means being so arranged paths substanrecord, a recording head and a reproducing head each of said heads. guide means foreach of said adjusting the'relationship of 3. In a-phonograph mechanism including a,

connecting the carriages to maintain the heads in predetermined relationship with respect to the record, said guide means being so arranged as to cause the heads to move in paths transverse to each other, a member pivoted on one of said carriages, to which member the flexible element is connected, and means to adjust said member about its pivot, whereby the position of said element may be optionally adjusted with respect to the said one carriage, and limited movement imparted to one of said headsindependently of the other head.

4. In a phonograph mechanism including a record, a recording head and a reproducing head for cooperating with the record, a carriage for each of said heads, guide means for each or said 5. In a phonograph mechanism including a record, a recording head and a reproducing head for cooperating with the record, a carriage for each 01 said heads, guide means for each ofsaid carriages to cause the associated head to move transversely of the record, means for moving one of said' carriages on its guide, a flexible element connecting the carriages to maintain the heads in predetermined relationship with respect to the record, and means including an adjustable wheel carried on one of said carriages and about which said element passes, for altering the relationship of the heads.

6. In a phonograph mechanism including a record, a recording head and a reproducing head for cooperating with the record, a carriage for each of said heads, guide means for each of said carriages to cause the associated head to move transversely of the record, means for moving one of said carriages on its guide, a flexible element passing over guide pulleys and connecting said carriages for corresponding movement, a pivoted member secured in adjustable manner to one of said carriages, said element being secured to said member, and means to adjust said member about its pivot, whereby the position of said carriage with respect to the element is altered.

7. In a phonograph mechanism including a record, a recording head and a reproducing head for cooperating with the record, a carriage for each of said heads, guide means for eachof said carriages to cause the associated headto move transversely of the record, means for moving one of said carriages on its guide, and a flexible element connecting the carriages to maintain the heads in predetermined relationship with respect to the record, one of said carriages rotatably carrying a'wheel to which said element is secured, rotation of the wheel serving to adjust the position'of the carriage with respect to the flexible element.

8. In a, phonograph mechanism including a record, a recording head and a reproducing head for cooperating with the record, a carriage'for each of said heads, guide means for each of said carriages to cause the associated head to move transversely of the record, means for moving one of said carriages on its guide, a flexible element connecting the carriages to maintain the headsin predetermined relationship with respect to the record, one of said carriages rotatably carrying a wheel to which said element is secured, rotation of the wheel serving to adjust the position of the carriage with respect to the flexible element, and

an indicator for showing the position of said wheel on its axis, whereby the relative position of the heads is indicated.

9. In a phonograph'm'echanisrn including a record, a recording head'and a reproducing head for cooperating with the record, a carriage for each of said heads, guide means for each of said carriages to cause the associated head to-move transversely of the record, means for moving one of said carriages on its guide, a flexible element connecting the carriages, guide pulleys for said element, and means for optionally causing said element to move about at least some of said guide pulleys while said one carriage remains stationary.

I FRANK RIEBER.