Патент USA US2106710код для вставки
Feb. l, 1938.l F_. Q_ BARTON ` 2,106,710 PHoNoGRAPH TURNTABLE DRIVING MECHANISM Filed Feb. 13, 1952 1 ` IN VEN TOR. Patented Feb. 1, I 1938 UNÍTE 2,106,710 STATES oFFIClïV 2,106,710v PHONOGRAPH TURNTABLE DRIVING MECHANISM Frederick C. Barton, Haddoníield, N. J., assigner to Radio Corporation of America, a corpora tion of Delaware Application February 13, 19,32, Serial No. 592,704 15 Claims. My invention relates to phonograph turntable driving mechanism and, more particularly, is an improvement over the invention disclosed in the co-pending application of Benjamin R. Carson, 5 Serial No. 512,244, filed January 30, 1931, and assigned to Radio Corporation of America. In reproducing sound from phonograph records (Cl. 274-9) * leased, at will, and the inner ball race may be coupled to either the ball retaining cage or the loutside race for the purpose of transmittmg mo tion to the super-incumbent turntable at '78 R. P. M. - The novel features that I consider character istic of my invention are set forth with particu of the disc type, it is necessary to rotate the disc larity in the appended claims. at a constant, predetermined speed. Heretofore, itself, however, both as to its organization and its method of operation, together with additional 10 objects and advantages thereof, will best be un derstood from vthe following description of a l0 the speed of the usual phonograph record was '78 to 80-` R. P. M. but there recently have been ln troduced phonograph disc records which require a speed of approximately 331A; R. P. M. Obvi ously, if a phonograph is to have commercial 15 merit, it must be so designed that records of either of the aforesaid types may be reproduced thereby, at will. -In the Carson application, speed changing mechanism >of the type including a plurality of 20 gears is disclosed, together with means whereby, through proper manipulation-of an adjusting ele ment, the record supporting platen may be caused The invention specific embodiment, when read in connection with the accompanying drawing, wherein the single ñgure is a view in vertical cross-section of 15 phonograph turntable speed changing mecha nism comprising a preferred embodiment of my invention. ‘ Referring to the drawing, my improved mech anism comprises a phonograph turntable i hav idg a, depending boss 3 provided with a trans verse keyway, or slot, 5 into which extends a to rotate at 78 or 331/3 R. P. M. Mechanisms of ` transverse pin l carried by a driven spindle 9. A ' the Carson type have gone into extensive public 25 use and have, in general, given a fair degree of satisfaction. It has been noticed, however, by those who are extremely critical, that the gear teeth in the said Carson mechanism tend to in troduce minor irregularities into the rotation of 30 the disc, which irregularities cause “wows”, or, in other words, momentary changes of pitch of the reproduced sounds. ` It is, accordingly, an object of my invention to provide a reducing gear for phonograph mecha 35 nism that shall be smoother in action than the reducing gears of the Carson type heretofore known. It is a further object of my invention to pro vide mechanism of the type described that shall 40 enable the reproduction of sounds from slow bearing Il, of any suitable type, may be pro~ vided, whereby the weight of the ydriven spindle 25 and the turntable is supported. ' 'I‘he driven spindle has a ball retaining cage I3 aiîixed thereto and depending therefrom. A plurality of balls l5 are provided which are »maintained in Vspaced relation by the depending 30 i ball retaining cage. An inner ball race Il is'v ailixed to the upper end of a driving vspindle I9 co-axial with the ñrst referred to spindle 9, the- said driving spindle being operatively connected to a prime mover, such as a motor M, for rota- 35 tion at 78 R. P. M. An outer ball race 2| is pro vided, to which is affixed a depending element 23. i The depending element may take the i'orm of an annular flange completely encircling the outer speed records without the introduction of objec ball race and being provided with a plurality of 40 inwardly directed gear teeth, or it may be a sin tionable “wows”. gle detent device, as illustrated. > It isa further and more speciñc object of my invention to provide mechanism of the type de 45 scribed that shall be devoid of gears. In accordance'with my invention, I provide a phonograph having a. driving spindle adapted to rotate at 78 R.: P. M., to which is attached ari in ner ball race. I further provide an outer ball 50 race which, at will, may be held stationaryand, in addition, I provide a ball retaining cage hav ing means aiñxed thereto whereby motion there of may be transmitted to a phonograph turnta ble. Inv addition, I provide a speed controlling device whereby thev outer ball race may be re > Obviously, if the outer ball race is prevented from rotating, rotary motion from the inner ball race will be transmitted to the balls in the re- 45 tainer l 3, and the said ball retainer will be caused ' to rotate at a speed determined by the relative diametersv of the balls and the inner- ball race. , 'In order that the outer ball race may be held > against rotation, I provide a pivoted lever 24, 50 having a ñattened‘end portion 25, which, when the lever is raised, moves into engagement with the 4depending velement 23_to restrain it from ro tating. A supporting device 21 may also be pro-1v vided, having a slotted end 29 into which the end 55 2,106,710 2 25 of the lever moves, and which supports the lever against the torque of the element 23. In the event that it is desired to rotate the turn- ’ table at '78 R. P. M., it is, of course, necessary to Gl release the outer ball race and to lock the inner 7. The invention set forth in claim 6 char acterized in that means are provided whereby said motion transmitting spindle may be operatively and immediately connected to a portion of said motion transmitting mechanism. and outer races together, as heretofore explained. For this purpose, I provide a collar- 3l slidably 8. In combination, a driving spindle, a driven spindle, motion transmitting- mechanism of the mounted on the lower driving spindle I9 and so planetary type jointly carried by said spindles, said dispose another end portion 33 of the aforemen tioned operating- lever that the collar may be moved axially of the said spindle. The collar is by the driving spindle, a ball spacing cage car mechanism comprising an inner ball race carried ried by the driven spindle, and an outer ball race provided wtih a pin 35 which extends outwardly into the path of the element depending from the outer ball race. When the lever is depressed to 15 the position shown’in the drawing, the outer ball disposed in operative relation to said ball spacing cage and said inner race. 9. In combination, a spindle adapted to be driven at a definite speed, a turntable support race is released and the pin carried by the collar _ ing and driving spindle, power transmission means engages the depending element’23 and thus effec tively locks the inner spindle to the outer ball race. Inasmuch as the relative sizes of the several ball races and the diameters of the balls, them selves, may be readily calculated by anyone skilled in machine design who is provided with the neces ~ sary handbooks, it is my opinion that detailed cal culations need not be given in order to render my disclosure complete. - ‘ ' . It will be apparent, from the foregoing dis closure of my improved phonograph platen driv _ ing mechanism that, through its utilization, turn table speeds of either 78 or 331/3 R. P. M. may 30 be had >at will. It should further be apparent that, inasmuch as all gearing has been omitted, the turntable, when rotating at, 331/3 R. P. M., will be extremelysteady and its speed will not vary in a manner to introduce “wows”. 35 Although I have shown and described a speciñc embodiment of my invention, I am fully aware that many modifications thereof will be readily apparent to those skilled in the art to which it of the planetary ball type frictionally geared to said first-named spindle, power take-off means carried by and depending from said turntable spindle and adapted to cooperate with the balls of said transmitting means whereby said first and second named spindles are indirectly coupled to gether, and means for locking a portion of said transmission means against rotation at -will to cause said turntable spindle to rotate'relatively to said first-named spindle. 10. The combination with a phonograph turn table adapted to rotate records of different re producing speeds, of a motor for driving said turntable, a shaft driven by said motor at a pre determined speed having a driving member on the end thereof, a spindle connected with said turntable having a driven member mounted there on, said driven member being adapted to em brace said driving member, a plurality of balls mounted for rotation in said driven member adapted to be engaged and rotated by said driv ing member, and means for clamping said balls in non-rotating position for locking with said driv pertains. My invention, therefore, is not to be ' ing member whereby said turntable will be di 40 rectly driven'thereby, and release said balls for -iO restricted except insofar as is necessitated by the prior art and. by the spirit of the appended claims. _ permitting rotating movementfthereof whereby I claim as my invention: said driven member will be indirectly driven there 1. In combination, a phonograph record sup through for rotating said turntable at a slower porting platen, a spindle adapted to be driven at a definite speed, speed changing mechanism of the planetary type frictionally geared to the spindle and positioned between said spindle and said platen, and means for restraining from rotating, at will, a portion of said mechanism. 50 ' 2. In combination, a spindle adapted to be ro 'tated at av predetermined speed, planetary gear mechanism comprising a plurality of ball races and a plurality of balls associated therewith car ried by said spindle, a record driving spindle and speed. y ' 45 11. The combination with a phonograph turn table adapted to`rotate records of different re producing speeds, of a motor for driving said turntable, a. shaft driven by said motor at a pre determined speed having a driving member on the 50 end thereof, a spindle connected with said turn table having a driven member mounted thereon, said driven member being adapted to embrace said driving member, a plurality of balls mounted for rotation in said driven member adapted to be 55 a ball spacing cage depending from said spindle _ engaged and rotated by' said driving member, and adapted to cooperate with the said balls to means for clamping said balls in non-rotating transmit motion to said turntable driving spindle. 3. The invention set forth in claim 2 char acterized in that means are provided for, at will, 60 effectively locking said ball races together, to prevent relative motion-therebetween. 4. The invention set forth in _claim 2 char acterized in that means are provided whereby-the lower spindle may be, at will, effectively locked position for locking with said driving member whereby said turntable will be directly driven thereby, and release said balls for permitting ro 00 tating movement thereof whereby said driven member will be indirectly driven therethrough for rotating said turntable at a slower speed, and manually operated means for altering the driving function of said balls as above set forth. es 65 to the outer race. 12. The combination with >a phonograph turn- ` 5; As an article of manufacture. a record platen . table adapted to rotate records of different re supporting and driving spindle provided with a depending ball spacing cage. . 6. In combination, a spindle adapted to be 70 driven ata predetermined speed, a record platen supporting spindle, motion transmitting means of the planetary type jointly carriedlby said spindles, and means for, at will, locking a portion of said motion transmitting means against rotation ‘Il producing speeds, of a motor for driving said lturntable, a shaft driven by said motor at a predetermined speed having a driving member on 70 the endr thereof, a spindle connected with said turntable having a driven member mounted thereon, said driven member being adapted to ’ embrace said driving member,y a plurality of balls mounted for rotation in`said driven mem- 75 2,106,710 ber adapted to be engaged and rotated by said 3 turntable having 'a driven vmember mounted thereon, said driven member being adapted to embrace said driving member, a stationary sup causing said driven member to be directly driven ' port for said turntable and spindle, a plurality of therethrough and unlocked therefrom to provide balls mounted for rotation in said driven mem a ball race for said balls for obtaining a slower ber adapted to be engaged and rotated by said driving member, and a ball race adapted to be locked with said balls and driven member for speed. 13. The combination with a phonograph turn table adapted to rotate records of different re producing speeds, of a motor. for driving said driving member, a ball race' adapted to be locked with said balls and driven member for causing said driven member to be directly driven there through and unlocked therefrom to provide a 10 turntable, a shaft driven by said motor at a pre ball race for said balls for obtaining a slower determined speed having a driving member on the end thereof, a spindle connected with said speed, and a clutch member for locking said race with said driving member while releasing turntable having a driven member mounted it from the support when said clutch is in one> \ position and when in the otherposition locking embrace said driving member, a plurality of balls the same with said support while releasing it mounted for rotation in said driven member from said driven member. 15. The combination with a phonograph turn adapted to be engaged and rotated by said driv ing member, a ball race adapted to be locked with ' table adapted to rotate records of different re said balls’and driven member for causing said producing speeds, of a motor for driving said 20 driven member to be directly driven therethrough turntable, a drive shaft driven by said motor at and unlocked therefrom to provide a ball race a predetermined speed of rotation, means for for said balls for obtaining a slower speed, and frictionally connecting said turntable with said drive shaft whereby said turntable will be di manually actuated means for locking and un rectly driven at the same speed of rotation, and 25' locking said bail race. El thereon, said driven member being adapted to 14. The combination with a phonograph turn means for releasing said frictional contact and table adapted to rotate records of different re- ' applying iii-piace thereof a diiîerential speed producing speeds, of a motor for driving said turntable, a shaft driven by said motor at a pre determined speed having a driving member on the end thereof, a spindle connected with said transmission for imparting to said turntable a decreased speed of rotation. 30 FREDERICK C. BARTON.