US2310229A - Combined sound reproducing-recording apparatus - Google Patents

Combined sound reproducing-recording apparatus Download PDF

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US2310229A
US2310229A US381555A US38155541A US2310229A US 2310229 A US2310229 A US 2310229A US 381555 A US381555 A US 381555A US 38155541 A US38155541 A US 38155541A US 2310229 A US2310229 A US 2310229A
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post
arm
feed arm
journal
recording
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US381555A
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Gay Paul Stead
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WILCOX GAY CORP
WILCOX-GAY Corp
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WILCOX GAY CORP
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02Arrangements of heads
    • G11B3/08Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers

Description

P. S. GAY
-Feb. 9, 1943.
COMBINED SOUND REPRODUCING RECORDING APPARATUS 2 Sheets-Sheet l Filed March 3, 19.41
(Jl pm .M
INVENTOR. aul gad gag,
ATTORNEY.
Feb. 9, 1943. R s GAY 2,310,229
COMBINED SOUND REPRODUCING RECORDING APPARATUS Filed March 3, 1941 2 Sheets-Sheeta 2 INVENTOR ATTORN EY Patented Feb. 9, 1943 asian COMBINED `SOUND REPRODUCING- RECORDING APPARATUS Paul `Stead Gay, Charlotte, Mich., assigner to Wilcox-Gay Corporation, Charlotte, Michi., a
corporation of Michigan Application Marca 3, 1941. sei-iai No. 381,555
I Claims.
application and over other prior apparatus is the provision ol.' a single arm which is capable of performing both the cutting (recording) and playback (reproducing) functions.
A corollary object, therefore, is the provision in sound apparatus having a single operating ann of a translating means which will serve to transmit sound impulses or vibrations to the recording or cutting needle and which will also serve to receive sound impulses or vibrations from a reproducing or play back needle, and translate them for aural reproduction.
A further object of the present invention is the provision in connection with a unitary sound recording and reproducing arm of means for readily selectively positioning the arm to perform either the recording or reproducing function and for maintaining the arm in selected position. Y
Still a further object is the provision of drive means for the arm when the same is performing its recording function, while at the same time providing means for automatically disengaging the driving means when the arm is positioned and operated to perform the reproducing function.
'I'hese and many other objects of my present invention will in part be apparent and where not apparent, pointed out, in the following description and drawings, in which:
Figure 1 is a view in perspective, partially broken away, showing the novel apparatus of my present invention;
Figure 2 is a view partly in cross-section, taken along the line 2-2 of Figure 1 looking in the direction of the arrows;
Figure 3 is an elevation, partly in cross-section, taken along line 3-3 of Figure 1, looking in the direction of the arrows and showing the apparatus arrangement for sound reproduction (playback) Figure 4 is a view corresponding to that of Figure 3 showing the apparatus arranged for sound recording (record cutting);
Figure 5 is a cross-sectional view showing the mounting of the operating arm and taken along une 5 5. of Figure 3, making in the diremos of the arrows. i
Referring now to the iigures, I have here shown 'A sound recording and reproducing apparatus, havcured to the base by the screws I2 or in any other and aresecured by nuts I5.
suitable manner.
A motor I3. (see Figures 3 and 4') is suspended from the under side of the plate i2 by means of bolts which pass through the mounting plate l2 Resilient rubber grommets IB are provided between the nuts I5 and the plate I2 in arder to provide a resilient mounting for the` motor so that the field poles thereof may rotate to compensate for power pulses and thus prevent the creation of hum in the record. This particular mounting of the motor and the function and operation of the resilient grommets are fully described in my application above mentioned.; and while this mounting forms a valuable and useful part of the present apparatus, it constitutes no part of the present invention. The apparatus of the present invention may be utilized in connection with any appropriate power source and any suitable type of mounting therefor.
The motor shift 20 extends upwardly vertically through an opening in the mounting plate l2 and hence projects on the upper side of base Ill.
The motor shaft 20 is in surface to surface engagement with the periphery of a rubber tired idler 22 which in turn is engaged with the inner surface of a dependent ange 23 of the turntable 24. The turn-table rotates on the spindle 25 and causes the same to rotate for the purposes hereinafter set forth.
` The rubber surfaced idler 22 is compressed be tween the iiange 23 and the motor shaft 20 and thus furnishes a resilient driving connection therebetween which further serves to reduce the eiect of power `pulses and other motor noises in the manner described more fully in my application above mentioned.
Compression of the rubber peripheral surface of the idler, however, does not affect the speed ratio of power transmission since changes of the diameter of the idler have no effect. This is so because whatever linear movement is transmitted to the surface of the idler by the motor is transmitted in equal degree to the surface of the turntable ange irrespective of changes in diameter of the idler.
The shaft 28 on which the idler 22 rotates is rotatably mounted on a mounting plate 30. The
mounting plate 30 has an annular boss 3| which bears against the base plate A bolt 32 secured to the mounting plate passes through an enlarged opening 33 in the base plate and carries secured thereto and positioned thereon by the nut 34 the washer 35, the said washer also having an annular boss 36 which bears against the under side of the plate The pressure of the washer 35 against the under side of the plate thus serves to secure the mounting plate 30 on the plate The hole 33 in the mounting plate through which the bolt passes has a larger diameter than the bolt 32, and accordingly the mounting plate 30 is permitted some movement with respect to the plate The plate 30 is resiliently biased outwardly and away from the motor shaft 2|) by the tension spring I0, one end of which is at 4| attached to the bolt 32 and the other end of which is at I2 hooked through a perforation 43 in the plate The placement of the turn-table 24 upon the spindle causes the flange 23 thereof to move the idler 22 against the bias of the spring 40 into engagement with the shaft 20. In the event that when the turn-table is mounted on its spindle, the distance from the flange to the shaft 20 is less than the diameter of the idler 22, then, by reason of the fact that the hole 33 is much larger than the bolt 32, the bolt 32 may be moved along an arcuate path (with the distance between the shaft 20 to the bolt 32 as a radius) until the idler has been adjusted so that both the shaft 20 and the flange 23 are in abutment therewith.
Thus the shaft 20 and the point of contact of the idler 22 with the flange 23 are not diametrically opposite each other across the idler, but rather are in the relationship shown in Figure 2 when the turn-table is .placed on the spindle. By this means, also, the rubber tire on the idler 22 is compressed between the flange 23 and the motor shaft 20 to ensure the transmission of power therethrough. v
The basic elements of the operation of the idler and of the mounting therefor above described have been set forth in my application Serial No. 320,823, and I have here set forth in detail only the variation in the mounting which falls, however, within the basic principles of the idler mounting therein described.
The foregoing apparatus has been set forth in detail in order to describe more particularly the environment and structure with which my ipresent invention is intended to cooperate. The contribution of the present invention relates specically to the combination pick-up and recording arm 50 which may be selectively positioned in order to perform the function of playing back a record which has already been cut or of cutting a blank record in accordance with the modulations impressed on the element carried by the arm. y
As is seen in Figures 1, 3 and 4, the pick-up arm 50 carries at the forward end thereof a cartridge which may function both as a pick-up head or a cutting head. In the 4preferred form, the cartridge 5| contains a piezo-electric crystal the functions and operations of which -for recording and play .back purposes are well known in the art.
The piezo electric crystal in the cartridge 5| is by the circuit connection 52 connected to any suitable .circuit `which may operate to translate modulations Vimpressed on the crystal into sound or it may be adjusted to impress modulations upon the crystal in order to translate sounds into vibrations of a stylus carried by the cartridge 5|.
The circuit connection 52 is so arranged in connection with switches (not shown) that it may be selectively connected to apparatus for translating modulations into sound or for translating sound into modulations of the crystal in the cartridge head. Such circuit connections, switches and apparatus may, if desired, constitute a simple adaptation of the elements shown in my application Serial No. 377,307 filed February 4, 1941.
The position shown in Figures i and 3 of the combination pick-up and recording arm 50 is that for pick-up or play back of records which have been cut. The position shown in Figure 4 is that for cutting a record in accordance with sounds which are impressed on the crystal in the cartridge 5|.
The change in position from the Figure 4 position to the Figure 3 position (and vice versa) must be accompanied by a corresponding switching operation to connect the cartridge 5| to the appropriate circuits for either recording or playing back. Such switching operations may be automatically performed by the change in position of the arm 50 or may be separately performed by a suitable switching dia-l, knob or lever having a plurality of switching positions.
The combination pick-up and recording arm 50 is as is seen more particularly in Figure 5, pivotally mounted at 60 and 6| on the plate 62. The plate 62 has vertical fianges 63 and 84 which have small perforations 65 and 66 therein in which the conical points 61 and 68 of the screws 69 and l0 may be mounted.
Nuts 1| and 12 mounted on the screws 69 and 10 may serve to position them appropriately with respect to the arm 50 and the flanges 62 and B3. By this means, therefore, a simplified needle bearing for the arm 5|! upon the plate 62 is provided. This double needle bearing for the pivot of the arm 50 permits the arm to be swung readily in a vertical plane in order to position the same properly with respect to a record while rotation of the arm necessarily results in rotation of the plate 62 since with respect to rotation in a horizontal plane, the needle bearing is a playless one.
The plate 62 is secured to the top of a post in such manner that it is integrated therewith and so that rotation of the post will result in rotation of the plate and vice versa.
The post 80 is rotatably mounted in the journal 8| which in tum is secured in any suitable manner in the top IU of the cabinet which contains the entire apparatus. The lower end of the post I0 carries secured thereto and rotatable therewith a feed arm so that any movement of the feed arm will result in corresponding rotation of the post 80. The feed arm 90 serves the function of rotating the post 80 and consequently rotating the combination recording and pick-up arm in a horizontal plane so that the cutting needle or stylusv |00 may be driven slowly inwardly towards the spindle 25 of the tum-table, thus cutting a spiral groove in the record disk |0| as the turn-table 24 rotates.
It is necessary, however, that the feed arm 30 be disconnected from any driving force when it is desired to use the combination play back or cutting arm for playing back a record which has been cut. The vertical slideability ofthe post 80 in its journal 8| serves to accomplish this function.
When the apparatus is in the positions shown in Figures 1, 3 and 5, with the post 30 moved down to its lowest position, and with the combination pick-up and recording arm 50 virtually parallel agresse 3 to the surface of the record. then the apparatus is set for the play back position and the grooves in the record which has already been cut may be translated into sound.
For this purpose then, in the lowered position shown in Figures l, 3 and 5, the feed arm 90 is disconnected from the driving screw and the combination pick-up and recording arm 50 is free to rotate with its post and with the feed arm in order to follow the grooves in the record. That is, although the feed arm and the post rotate as the arm 50 rotates, when the record is being played back, they perform no operative function at that time.
When, however, the post 80 is slid upwardly to the position shown in Figure 4, then the feed arm 90 is likewise moved upwardly and the pawl 20 on the end thereof is engaged with the threads of the screw ||0. The pawl |20 as may readily be seen in the figure, is preferably a flat strip of spring metal which is secured by the rivets |30, |30 to the end of the feed arm 90 and which is bent up at |3| and |32 to provide the pawl or knife edge |20.
The angle of the bend |3| is preferably an obtuse angie and is as close to 180 as possible in order that the spring metal of the pawl |20 should be permitted to have substantially no lateral compliance. The reason for the bend at 3|, however, is to provide a. certain amount of vertical compliance or resilience in order to ensure that the knife edge |20 will be forced into the threads of the screw ||0 so that a driving engagement may exist between the screw ||0 and the feed arm 80. The screw ||0 is rotated when the turn-table 24 rotates by a suitable gear connection |40 between the said screw ||0 and the spindle 25 which rotates with the tum-table.
It will now be clear that when the post 80 is slid upwardly to the position shown in Figure 4 and the knife edge pawl |20 of the feed arm 90 is engaged with the threads ||0 of the screw, that rotation of the turn table 24 causing rotation of the spindle 25 will through the gear connection |40 cause rotation of the screw ||0 and consequently cause the' pawl 20 to move along the thereof, and a supporting and chamfered surface 2 I3 on the upper side thereof.
'I'he extending lug 2| 4 which is secured to the post 80 (and which is also part of the feed arm 90 for purposes hereinafter described), is so arranged that when the post 80 is slid upwardly in its Journal, the plug 2|4 will first engage the chamfered surface 2| 2 of the spring 2| and move the same towards the left with respect to Figures 3 and 4.
After the lug 2M has passed the peak of the chamfered surface 2|2, it will then be engaged with the surface 2 I3 in the manner shown in Figure 4, and will thus rest thereon. The spring 2|| is suciently strong to maintain its position shown in- Figure 4 wherein the surface 2|3 thereof supports the weight of the post 80, the combination arm 50 and the feed arm 90, and accordingly will support the apparatus in operative position for recording purposes.
When it is desired to disengage the combination arm 50 from its recording relationship and to play it once more in play back relationship, simple manual pressure in the area 220 of the combination arm 50 will serve to force the post 80`downwardly and press the lug 2|4 down on the surface 2|3 to cause the spring 2| once more to move to the left and thus disengage the lug 2|4 from its support by the spring and thus permit the apparatus to return once more to the position shown in Figure 3.
When it is desired to raise the apparatus to recording position once more, then simply grasping the combination arm 50 at the rear end thereof adjacent the screws 69 and wand lifting the same will cause the lug 2|4 to pass the chamscrew, thus rotating the feed ann 90, rotating the post 80 and rotating the combination recording and pick-up arm slowly towards the spindle so that a spiral groove may be cut in the record disk |0| on the tum-table.
A suitable stop |50 may be provided to prevent movement of the feed arm to such a position that the stylus |00 on the combination pick-up and recording arm 50 may not move too close to the spindle.
When the combination arm 50 is in the position shown in Figure 3, then the plate 62 resting on the top of the journal 0| provides an appropriate stop for the post 80 so that the post is accurately positioned within the journal 8| and so that the combination arm 50 is properly positioned for playing back a record. In this case, an ordinary play back needle 200 may be inserted in the cartridge 5| 'and secured therein by the screw 20|. Itl is necessary, however, to likewise provide a support for the vpost 80 when it lis in its raised position'and whenthe feed arm 30 isv vin operativeengagement with the screw ||,0.
fered surface 2| 2 and come to rest on the surface 2|3 where the apparatus is once more in recording position.
A cutting stylus |00 then inserted in the cartridge 5| and held therein by the screw 20| will now serve to translate sound modulations impressed on the piezo electric crystal of the cartridge 0| into sinusoidal grooves in the surface of the record.
The lug 2|4 may, of course, be attached to the post in any suitable manner. Also, the edge thereof which is in engagement with the spring should be appropriately curved so as not to impede free rotation of the post when the post is in the posi-tion shown in Figure 4.
In the present embodiment, I have shown the lug 2|4 as part of the feed arm which in turn is secured to the post B0 by means of the set screw 240 which passes through the vertical flange 24| and is engaged against the milled surface 242 of the end of the post 80. The milled end 242 of the post 80 thus passes through perforations in the lug 2|4 and in the main portion of the feed arm 90 and the engagement of the screw 240.
serves to position the same accurately and positively with respect to the post.
In the event that it is desired to adjust the feed arm in order to adjust the position of the pawl |20 with respect to screw H0, then a simple loosening of the set screw 240 will permit the said arm to be slid upwardly or downwardly on the milled end 242 of lthe post in order. to adjust the horizontal position of the feed arm andin order to provide for the appropriate adjustment of. the pawl |20 with respect to the screw ||0.
For play back purposes, it. is usually desirable that the play back needle 200 occupy the angular position shown in Figure `3 with respect to the record disk in order that the needle 200 may trail appropriately in the grooves. Accordingly, the opening in the cartridge 5I in. which the needle 200 is to be mounted, is properly slanted in order to provide this relationship.
However, for cutting a record, it is necessary that the cutting edge should not trail with respect to the record but should be substantially normal thereto. The raising of the end 220 of the ccmbination arm 50 to the position shown in Figure 4 thus causes the combination arm 50 to slope downwardly towards the front thereof in the manner shown in Figure 4, thus making the slanted opening of the cartridge in which the needle is mounted more nearly vertical, thus permitting the cutting stylus |00 to assume the proper vertical cutting position which is necessary for cutting a record.
Thus the movement of the arm 50 to the position shown in Figure 4 normally serves to engage the feed arm in driving relationship but also serves to change the position of the cartridge so that the cutting stylus when placed therein will have the proper relationship to the record surface in order to ensure proper cutting.
In the process of cutting a record, best results are obtained when stylus pressure 'is properly maintained, that is, when the pressure of the cutting stylus is neither too heavy nor too light. The weight of the combination arm 50 is preferably such as to ensure appropriate cutting pressure.
But in order to ensure that some adjustment may be made, the cutting arm may be made so that the weight thereof on the cutting stylus will be slightlygreater than is necessary for proper cutting pressure.
The weight of the arm itself, however, may then be counteracted somewhat by the leaf spring 250 which is secured in any appropriate manner such as' by rivets 25| to the plate 62. 'I'he bearing surface 253 of the leaf spring 250 may then be so arranged that it will not cooperate in any manner with the combination arm E0 when the arm is in the position shown in Figure 3.
When the arm is raised and sloped in the manner shown in Figure 4, then the bearing surface 253 of the leaf spring 250 may be brought into supporting relationship with the under surface of the arm 50 and serve partially to support the same. Adjustment of the leaf spring 250 by manually bending the same so that it provides more or less supporting pressure for the arm 50 will serve therefore to adjust the pressure on the cutting stylus |00.
When the apparatus is not in use, the combination arm 50 may be supported on the post 300 as shown in Figure 1 in order to maintain the needle or stylus carried thereby out of engagement with any surface which may have a deleterlous effect thereon. Further, a plurality of vertical tubes 30I, 30|, closed at the bottom end, may be provided in the top surface I0 of the cabinetI in order to provide a means for retaining needles which are not in use.
This is useful with respect to the present device since needles 200 and |00 must be interchanged with each other when the apparatus is changed from play back to recording, and vice versa.
The foregoing simplified compact construction permits of the manufacture of a small unit which may be portable if desired, and which may nevertheless combine the functions of a phonograph, a recording instrument and even of a radio. In actual construction, the combined unit having the apparatus above described in the top thereof and having amplifying equipment and the necessary sound translating equipment (both loud speaker and microphone), and radio circuits as well, may be embodied in a portable casing, the total weight of which is less than eighteen pounds.
In the foregoing, I have described the simplest and preferred embodiments of each of the aspects of my invention. Each of the elements thereof, it is now clear, may take many other forms within the spirit of this invention. I prefer, accordingly, to be bound, not by the specific disclosures herein, but only by the appended claims.
I claim:
l. In sound recording and reproducing apparatus, a turn-table and, means for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable to another position in said journal and means for pivotally supporting said post in said other position for engaging said feed arm with its driving means.
2. In sound recording and reproducing apparatus, a turn-table and means for. driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical-post, said post being rotatable in a. journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable vertically in its journal to another position to engage said feed arm with its driving means, and a yielding chamfered surface for supporting said post in said raised position, said post being disengageable from said support by manual pressure on the top of said post.
3. In sound recording and reproducing apparatus, a turn-table and means for driving the same; an operating arm carrying s. sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable in its journal to a raised position to engage said feed arm with its driving means; a lug at the bottom end of said post, a yielding chamfered surface for engaging said lug and supporting said post in raised position, said lug being disengageable from said supporting surface by manual pressure on the top of said post.
4. In sound recording and reproducing apparatus, a turn-table and means for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable to a raised position in its journal to engage said feed arm with its driving means, and a yielding chamfered surface for supporting said post in said raised position, said post being disengageable from said ing a knifeedge pawl movable vertically with` 9 support by manual pressure on the top of said post, said operating arm being pivotal in a vertical plane on said post; said sound translating element being in engagement with a record disc on the surface of said turn-table in each position of said post.
5. In sound recording and reproducing apparatus, va turn-table and means for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a. feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable to another raised position in its journal to engage said feed arm with its driving means, and a yielding chamfered surface for supporting said post in said raised position, said post being disengageable from said support by manual pressure on the top of said post, said operating arm being pivotal in a vertical plane on said post; said sound translating element being in engagement with a record disc on the surface of said turn-table in each position of said post, an opening in the bottom of said. sound translating element for supporting a needle; the axis of said opening forming an acute angle with the surface of said turntable in 'the lower position of the post; the axis of said opening being substantially normal to the turn-table in the raised position of the post.
6. In sound recording and reproducing apparatus, a turn-table and means for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally'supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable to another raised position in its journal to engage said feed arm with its driving means, and a yielding chamfered surface for supporting said post in said raised position, said post being disengageable from said support by manual pressure on the top of said post, said operating arm being pivotal in a vertical plane on said post; said sound translating element'being in engagement with a record disc on the surface of`said turn-table in each position of said post; and adjustable yielding means carried by said post and engageable with the under side of said operating arm when the post is in raised position for partially supporting said arm.
7. In sound recording and reproducing apparatus, a turn-table and means for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said. journal in one position with the feed arm disengaged from its driving means; said post being slidable to another position in said journal and for pivotally supporting said post in said other position for engaging said feed arm with its driving means; said driving means for said feed arm comprising a horizontal screw rotatable in ratio with the rotation of the turn-table, said feed arm carrysaid feed arm into engagement with the thread of said screw.
8. In sound recording and reproducing apparatus. a turn-table and means for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving' means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from lits driving means; said post being slidable to another position in said journal and for pivotally supporting said post in said other position for engaging said feed arm with its driving means; said driving means for said feed arm comprising a horizontal screw rotatable in synchronism with the rotation of the turn-table, said feed arm carrying a knife-edge pawl movable vertically with said feed arm into engagement with the thread of said screw, said knife edge pawl being resiliently mounted to have vertical compliance and little lateral compliance.
9. In sound recording and reproducing apparatus, a turn-table iimeans for driving the same; an operating arm carrying a sound translating element at one end and secured at the other end on a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with the feed arm disengaged from its driving means; said post being slidable to another position in said journal and for pivotally supporting said post in said other p'osition for engaging said feed arm with its driving means; said driving means for said feed arm comprising a horizontal screw rotatable in synchronism with the rotation of the turn-table, said feed arm carrying a knife-edge pawl movable vertically with said feed arm into engagement with the thread of said screw, said knife-edge pawl comprising a resilient substantially horizontal sheet metal 'member secured to the erid of said feed arm and extending from one side of said arm, said knife edge pawl constituting a substantially vertical extension of said sheet metal member parallel to the axis of said feed arm.
10. In sound recording and reproducing apparatus, a .turn-table! and means for driving the same an operating arm carrying a sound translating element at one end and secured at the other end on .a vertical post, said post being rotatable in a journal; said post carrying a feed arm, driving means for said feed arm; means for pivotally supporting said post in said journal in one position with .the feed arm disengaged from its driving means; said post being slidable to another position in said journal and for pivotally supporting said post in said other position for engaging said feed arm with its driving means; said driving means for said feed arm comprising a horizontal screw rotatable in synchronism with the rotation of the turn-table, said feed arm carrying a knife-edge pawl movable vertically with said feed arm into engagement with the thread of said screw; said feed arm being adjustable on said post to adjust the engagement of said pawl and said screw.
PAUL STEAD GAY.
US381555A 1941-03-03 1941-03-03 Combined sound reproducing-recording apparatus Expired - Lifetime US2310229A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782042A (en) * 1951-10-05 1957-02-19 Wilcox Gay Corp Tone arm with a cutting and play-back needle
US3223422A (en) * 1961-11-06 1965-12-14 Ernst Max Portable battery operable record player
US3402936A (en) * 1964-02-24 1968-09-24 Jensen Karl W Phonograph tone arm support
DE3540803A1 (en) * 1985-11-16 1987-05-21 Thomson Brandt Gmbh Record player with a pivotable pick-up arm

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782042A (en) * 1951-10-05 1957-02-19 Wilcox Gay Corp Tone arm with a cutting and play-back needle
US3223422A (en) * 1961-11-06 1965-12-14 Ernst Max Portable battery operable record player
US3402936A (en) * 1964-02-24 1968-09-24 Jensen Karl W Phonograph tone arm support
DE3540803A1 (en) * 1985-11-16 1987-05-21 Thomson Brandt Gmbh Record player with a pivotable pick-up arm

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