US1407781A - Sound-reproducing machine - Google Patents

Description

F. CHENEY.

SOUND REPRODUCING MACHINE.

APPLICATION FILED AUG. I3. I917.

1,407,? 81. Patented Feb 28, 1922.

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ronnsr CHENEY, .orcnicneo, rumors, Assrenon rocnnNnY TALKING-"MACHINE COMPANY, .or CHICAGO, ILLINOIS, n CORPORATION or. ILLINOIS.

SOUND-BEPRODUCING MACHINE.

Specification of Letters Patent.

Patented Feb-28; .1922.

To allwlmmz't may cance /n:

- Be itknown that L'FonnsT CHENEY, a cit1 zen of the United Statesand res1dent-.ot

Chicago, in the county of Cook andState This invention relates to soundiireproduc-' 111g machines and more particularly to speed indicating and control means therefor.

One of the objects of the inventionwis to improve the control of sound; reproducing machines.

Another objectis to make possible the syn chronizing ofthe various parts ofarsound reproducing machine inoa simple manner.

Another 'objectis to provide novel control means for-machines of the-type indicated, adapted tomeet the various requirements for successful use.

These and other. objects are accomplished by providing in wa-ma'chine of theclass described, the combination of driving means, a speed indicating dial, a pointer movable relative to said dial to indicate speed conditions, and a memberfor controlling the speed of the: driving means, said pointer beingmovable independently of said mem ber forsynchronizing said pointer-with said drivingmeans and control member.

The invention is illustrated on the accompanying-sheet ofdrawings in which Figure l; is a fragmentarysectionalview of a sound reproducing machine embodying my invention; i s

Figure 2 is attragmentary plan View of my speed indicating and controlling means for such a machine; j I

Figure 3 is a sectional view talren iiithe planeof line 3-3 of Figure 2-;

Figure-4 is a-sectional view taken in the plane'of-line 41-at of Figu-refi, and

Y Figurefiis a view,pa'itsbeing insection, taken in the plane of line 5- 5 ojf Figure 3.

The va-rious'novel features of my invention will be apparent from the. following description-and drawings an'd willbe gparticularlypointed out in the appended claims.

Every piece of music which is played or sung hasits tempo. The tempo'of one piece of music may beentirely diflerentfjfrom the term of another piece. "Inorder toe-Hectivelyreproduce a piece of music, for instance by means of-asound-reproducing mayieldingly upwardly by a chine, the piece should be reproduced in its proper tempo. It is a common faultthat pieces which are reproduced on a talking machine may be playedtoo 'fast or too slowly. The piece maybe marked for a gn en tempo and the operator of the machine give the speedindicato'r a correspondmg position and still one may be conscious of the fact that the piece is being pla ed too faster too slowly. In other words, t ie true tempo of thepiece' and the speed indication are not' 1n proper-accord or in synchronism. Under such conditions it is apparent that a correction of some nature is necessary to rcctify the error. For example, the speed indicating pointer may point to the-numeral 70 on the speed indicating dial'andthe mo tor of the-machine be turning the table spindleat-the rate of SOrevolutions per un'it'of time. It is apparent that under these conditions" there is a-discrepancy or tenrevolutions. 'Heretoiore it has been impossiliile-to adjust this discrepancy in'anysiimple manner. -However, by meanscf my invention it is possible to shift the position of the speed indicating'pointer with respect to the speed indicating dial,- independently of "the speed control member for synchronizingthe pointer with the driving; means and "control member.

By referring tothe a-ccompanyin sheet of drawings it will be'noted that Ihave shown a sound reproducing machine having a motor or suitable driving means" 11 including agear 12' mounted uponone end of a spindle 13, tothe other end of which is secured a turn-table 14 upon which a re w may bemountcd for playing; Intermediate the endsof the turn-table spindle 13' is a worm gear 15 in mesh with which is'a worm 16 mounted. upon a suitably supported shaft 1'? towhich is secured a brake'disk 18. Also operatively connected with the shaftd'lis a fiy-ballspeed governor19which is operativelyconnected to. a brake 20, the shoe of which isadapted'to frictional-1y engage the disk 18 for controlling or retarding thespeed withwhich the turn-table 14' is rotated. The brake 120 is pivotally mounted at 21 to a. suitable support and is operatively connected with a brake 1ever'22, the free end of'which is bifurcated and embraces thQipOSt 23 of speed control and indicatingmechanism 24. The free end of the brake lever is also pressed spring 25-against a cam 26 which is fixedly secured to the post 23. From this arrangement it is apparent that if the cam 26 is rotated with respect'to the brake lever it will either depress-the free end of the brake lever 22 or permit the same to rise under the influence of spring 25 thereby influencing the speed governor 19 and as a result thereof the speed atwlnch the turn-table 1 1 is driven by the driving mechanism 11.

A stationary speed, indicating dial 2? is fixedly secured to a supporting member 23 of the sound reprmlucing machine, and it will be noted that this speed indicating dial is provided with numbers ranging from T0 to 100. Cooperating with this speed indicating dial and movably mounted thereover is a speed indicating pointer 29 which points to a mark on the dial to indicate the number of revolutions that the turn-table 14 makes in a given unitof time. This pointer 29 has an annular ring 30 which is loosely mounted over an enlarged portion of the post 2-3 and loosely occupies a corresponding groove 15 I in the collar portion 32 of a knob mounted over the upper end of the post 23. It will be noted that the pointer 2-9 also occupies a notch or recess 31 in the collar portion 32. By means of the pointer 29 being received in thenotch 31 the pointer is made to travel with respect to the speed indicating dial when the knob 33 is turned. Normally the knob 33 is secured to the post 23 by a set screw 34: which engages a groove 35 in the 7 upper portion of the post 23, and it will be noted that the upper shoulder 36 of the groove 35 is so located relatively to the set screw 34 that unless the set screw 34 is intentionally withdrawn beyond the shoulder 36, it is impossible to raise the knob 33 to a point where the pointer 29 is released from the notch or recess 31 in the collar 32 of the knob 33. In other words, it is desirable that the pointer 29 at all times be locked within the notch 31, andthe set SCI'BWBL is so positioned with respect to the shoulder 36 to make such conditions possible, and as a matter of fact a spring washer 37. is provided just below the ring portion 30 of the pointer 29 to hold the pointer up in the notch 31 and also to hold the pointer out of engagement with the surface of the speed indicating dial 27. I

Normally the knob 33 is secured to the post 23 by the set screw 34: so that any movement of the knob not only will causeamovement of the pointer 29 to showa change of speed but also will rotate the cam 26 for changing the speed conditions of the driving mechanism through the brake lever 22 and its associated parts. The knob should remain locked to the post 23 so long as the piece of music is beingdreproduced at the proper tempo with the speed indicating pointer indicating a proper corresponding numberot revolutions per unit of time the turn-table is being rotated. However, if there is a discrepancy between thespeed indication at the speed dial and the speed with which the turn-table. should be rotated for a piece of a given tempo, such discrepancy may be rectified by loosening the set screw 34: sufiiciently to permit the knob 33-and thereby the speed indicating pointer 29-to move inat the lower end thereof the cam is providectwith a stop 39 to prevent the brake lever 22 from snapping upwardly to its extreme high position from its extreme low position. In other words, the cam is permitted to rotate substantially 360 degrees but cannot go beyond that point. The cam must therefore be returned in a counter movement. 'It might be said that the cam 26 may be reciprocated back and forth through an angle of substantially 360 degrees, making it possible to accurately and delicately adjust the speed at which the turn-table 14 is rotated. A shoulder 10011 the stem 23 and also the upper portion of the cam-limit the upward movement. of the brake lever 22. It might be stated,also, that the vertical wall 41 of the cam 26Zcooperating with brake lever 22 limitst-he movement of the cam in one direction, while the stop member 39 limits the movement of the cam in an opposite direction. a

'It is evident that there may be various modifications of the invention herein particularly shownand described, and it is my intention to cover all such modifications which do not involvea departure from the spirit and scope ofthe invention-as set forth in the following claims,

I claim: a

1. In a machine of the class described, the combination of a speed indicating dial, a supporting member having a groove therein,

a pointer loosely mounted on said-supporb' ing member and movable over said speed indicating dial, speed control means mounted on said supporting member, a control knob mounted on said supporting member and having a recess for the reception of said pointer, and means associated with said knob and with the groove in said supporting member to prevent disengagement between the knob and the pointer. v

2. y In a machine or the class descrihed, the combination of a supporting member, a

speed controlling cam mounted on said supporting member, and a speed controlling lever operatively connected with said cam member for controlling the speed of the machine, said cam member being movable through substantially 360 degrees, and a stop at the high point of the cam adapted to engage the lever to prevent further ro tation of the cam.

3. A motor regulator comprising a central stem; a cam surrounding said stem; a lever sliding on said stem and operable by said cam; and a governor controlled by said lever, substantially as described.

el. A motor regulator comprising a central stem; a cam surrounding said stem; a bifurcated. lever sliding on said stem and operable by said cam; and a governor con trolled by said lever, substantially as de scribed.

5. A motor regulator comprising a central stein; a sleeve surrounding said stem and having its end formed into a helical cam; a lever sliding on said stem and operable by said stem; and a governor controlled. by said lever, substantially as de scribed.

G. A motor regulator comprising a-ce1i tral stem; a sleeve surrounding said stem and having its end formed into a helical cam; a bifurcated lever sliding on said stem and operable by said cam; and a governor controlled by said lever, substantially as described.

7. In a regulator for motors, the combination with a post, of a plate through which said post rot-atively extends, a. pointer on said post and movable therewith relatively to a scale on said plate, a cylindrical sleeve concentrically fixed to said postand having its edge formed into a helical. cam, a lever enga 'ing said cam, a spring for yieldingly maint ning said lever against said cam, a governor controlled by said lever,'a stem projecting from said post concentrically within said sleeve'and slidingly engaged by the end otsaid lever to guide the same during its movement by said cam and maintain it in radial relation to said sleeve.

8. In a regulator for motors, the combina tion with a post, of a plate through which said post rotatively extends, a pointer on said post and movable therewith relatively to a scale on said plate, a cylindrical sleeve concentrically fixed to said post and having its er ge formed into a helicalcam, a lever engaging said cam, a spring for yieldingly r it maintaining said lever against said cam, a.

governor controlled by said lever, and a stop formed on said sleeve'at the lower end of said cam projecting into the path of said lever. v

9. In a regulator for motors, the combination with a post, of a plate through which said post rotatively extends, a pointer on said post and movable therewith relatively to a scale on said plate, a cylindrical sleeve concentrically fixed to said post and having its edge formed into a helical cam, a lever engaging said cam, a spring for yieldingly maintaining said lever against said cam, a governor controlled by said lever, the cam being substantially 360 in extent, the high and low points being joined by a vertical step which serves as a stop to engage the lever to limit rotation of the cam in one direction.

10. Ina regulator for motors, the combination with a post, of a plate through which said post rotatively extends, a pointer on said post and movable therewith relatively to a scale on said plate, a cylindrical sleeve concentrically fixed to said post and having its edge formed into a helical cam, a lever engaging said cam, a spring for yieldingly maintaining said lever against said cam, a governor controlled by said lever, the cam being substantially 360 in extent, the high and low points being joined by a vertical step which serves as a stop to engage the lever to limit rotation of the cam in one direction, and a stop upon the high point of the cam to limit rotation of the cam in the opposite direction.

V 11. In a regulator for motors,'the combination with a post, of a plate through which said post rotatively extends, a pointer on said post and movable therewith relatively to a scale on said plate, a cylindrical sleeve concentrically fixed to said post and having its edge formed into a helical cam, a lever engaging said cam, a spring for yieldingly maintaining said lever against said cam, a governor controlled by said lever, a stem projecting from said post concentrically within said sleeve and slidingly engaged by the end of said lever to guide the same during'its movement by said cam and maintain it in radial relation to said sleeve, the cam being substantially 360 in extent, the high and low points being joined by a vertical step which serves as a stop to engage the lever to limit rotation of the cam in one direetion, and a stop upon the high point of the cam to limit rotation of the cam in the opposite direction.

Signed at Chicago, Illinois this 3rd day of August, 1917. r

FOREST CHENEY.

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