US1547374A

US1547374A - Sound-reproducing machine

Info

Publication number: US1547374A
Application number: US691681A
Authority: US
Inventors: Elmer A Farmer
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-02-09
Filing date: 1924-02-09
Publication date: 1925-07-28
Anticipated expiration: 1942-07-28

Description

July 2s, 1925.

E. A. FARMER SOUND REPRODUCING MACHINE Filed Feb. 9. -1924 3 She'etS-Sheet 1 July 28,"19251 1,547,374

E. A. FARMER SOUND REPRODUCI'NG MACHINE Filed Feb. 9, 1924 3 SheetsfS-heet 2,

July 2s, 1925.

1,547,374 E. A. FARMER SOUND REPRQDUCING MACHINE Filed Fem 9, 1924 "s 'Sheets-sheet :s

` Fi v;- 18 .l a? Y' #fined Patented July 28, 1925f UNITED STATES Emana A. FARMER, or MONTREAL, Qualiano, CANADA.

soUNn-anrnonuorner MACHINE.

Application filed February 9, 1924; Ser'ial'No 691,681".

To; all whom' t may concern:

Be it knownI that I, ELMER A. FARMER, of the city ofM'ontrea'l, Province of Quebec7 Dominion of Canada, aV citizen of the United Sta-tes, have invented'l certain new and useful Improvements in SoundReproducing Machines; and I dohereby declare that the following is a full, clear, and exact description thereof.

My'invention relates to sound reproducing machines ofthe type including in its operating mechanism a friction driving' disc and a roller inv rotative relation therewith, one being operated by the motor and transmitting movement to the other and through it to the turn table; and it also relates to the mechanism for controlling the time of the sound reproduced, and the means for starting and automatically stopping the machine.

The object of my invention is'to simplify the construction of machines of this type and render the operation more uniform and at the same time reduce the friction inthe operating and controlling parts thereby .increasing the ethciency and making the control more sensitive.

A feature of the invention is a complete electrically operated driving unit which may be readily installed in any of the standard makes vof machines of this type.

Further features are an improved mounting of the friction rollerl and turn table shaft; mechanism for obtaining fine adjustment of the speed of rotation of the turn table; and sensitive mechanism for starting and automatically stopping the machine.

The lastementioned mechanism is so constructed and arranged that an instantaneous stop is effected precisely at the point of adjustinent.

For full comprehension, however; of my invention reference must be had to the accompanying drawings in which similar reference characters indicate the same parts and wherein:

Figure l is a horizontal sectional view taken on line 1"-1 Figure 2 illustrating particularly the' relative positions of the parts of my improved sound reproducing machine;

Figure 2 is a vertical sectional view taken on line 2 2 Figure l illustrating particularly the operative connection between the motor and turn table shaft and the particular mounting` of the motor andturntable shafts;

Figure 3 is a fragmentary view of one corner of the oase of the machine and illus'- trating particularly'7 the time control;

Figure 4t' is a vertical` sectional' view of the time control shaft mounting;

Figure 5A is a fragmentary plan view of the motor board with starting and automatic stopping devices mounted thereon;

Figures 6, 7;* 8; 9 and l() illustrate in detailthe several parts of this'sta-rting'and automatic stoppingI mechanism;

Figures 11 and lf2 are side elevations thereof looking from differentangles;

Figures 13 and 14 illustrate' the manner in which the automatic stop'is adjusted;

Figure I5 is a side elevation of the tone arm with the trip of the automatic stopping mechanism' mounted thereon;

Figure 16 is aV fragmentary plan view of the automatic starting and stopping mecha'- nism;

Figure 17 is a detail plan View of a'modified means for adjusting the speed of rotation of the turn-table; andy Figure 181s a detail view of the means for securing' the time control shaftIv in position The entire mechanism constituting this inventionl is assembled as av unit which may be installedin practically all standard makes of machinesoff this type in substitution for the turn-table driving mechanism which usually is spring operated. Figure 2 illustrates the manner in which the unit is mounted in place; the body of the machine beingindicated in dotted lines andthe unit in full lines. The unit comprises parts locatedbelow the motor board consisting of a supporting frame and motor with friction drive and mechanism for adjusting speed of rotation of the turn-table and mechanism located abovel the motor board consisting ofv a comparatively large circular carrier plate and startingl and stopping mechanism mounted thereon and a turn-table which of course is detachable.

The friction drive between the motor and turn-table shaft is soconstructedy andj arranged that maximum precision of operation with minimum resistance to `adjustment axially relatively'to the shaft is obtained Th'efmotor is indicated at 2 and isl suspended from the supporting frame 50in a similar manner to that described in my pending application Serial No.l 534252' with theV shaft 2"L disposed horizontally. One

lUU

end of the latter is rotatably mounted in a hub 3a forming a component part of the motor case 3. This hub is bored axially to receive the shaft, and bushings 3b of Babbitt metal are inserted in each end of the boring thus formed, that portion of the boring between the bushings having a larger diameter to provide a lubricating chamber 3- with which a vertical supply duct 3d communicates. The armature or rotor as indicated at 4 is secured upon the extreme inner end of the shaft and prevents axial displacement of the latter in one direction while displacement in the reverse direction is prevented by a collar 17 fixed upon the shaft by a set screw 18 adjacent a Babbitt metal washer 18a mounted in the motor case. That portion of the motor shaft which projects outwardly from the motor case as at 6 is slotted or grooved longitudinally as at 6a to receive a key or lug 7 a carried by a sleeve 7 which is mounted upon the shaft and in telescopic relation therewith, the key and slot limiting the extent of axial travel of the sleeve upon the shaft. This sleeve has a pair of parallel encircling flanges 8 and 9 between which a friction roller 2 preferably of soft rubber is fixed, the roller being rotatable with the sleeve and adapted to frictionally engage a disc on the turn-table shaft to be presently described The end of the sleeve farthest from the motor is provided with a rawhide tip or point 10 and a helical spring 14 contained within the sleeve bears between this tip and the adjacent end of the motor shaft forV the purpose of imparting to the sleeve a tendency to assulne a position with the key 7? engaging the outer end of the slot 6a. The means for adjusting the roller axially along the motor shaft consists of a shaft 2O supported in the frame 5()V through a hole in which it projects. This shaft is supported in place, against downward movement, by a displaceable suspending flange in the form of a horse-shoe plate 21 straddling the shaft in engagement with slots 22 on opposite sides of the latter. The suspending plate is retained against movement by a cupped washer 23 slipped onto the shaft before the horseshoe plate is inserted to position, the latter being so fashicned and the cupped washer being of such diameter that the cup receives the plate when set in place with the shaft producing downwardly in the hole of the frame. It then rests on the cupped washer 23 and the suspending plate suspends it in position with freedom to rotate. A short distance below the frame the shaft is encircled by a comparatively heavy expansile spring 24. A second horse-shoe plate 26 straddles the shaft in engagement with a pair of slots 27 in the opposite sides of the shaft and a cupped washer 28 covers this plate while the spring 24 bears with considerable tension between the washer 28 and the underside of the frame to yieldingly resist rotation of the shaft 20. The upper end of the shaft projects upwardly through an opening 29 in the motor board and is squared as at 30 to receive one end of an adjusting arm 31 which has an opening for the purpose. The other end of this arm carries a pointer 32 and a finger hold 33, the pointer being movable across a graduated plate or dial 34C which may be detachably secured either to the plate 62 or the motor board by screws 34a and nuts 34th. The graduations of the plate indicate dierent degrees of speed at which it is desired that the machine oper ates. The lower end of the shaft 2O carries a resilient curved arm 35 fastened in place in a recess 36 by a screw 37. This arm is preferably constructed of spring steel and it extends from the shaft to position to have its face lie at right angles to the axis of the sleeve 7 and in engagement with the point 10. By movingthe speed adjusting arm 31 the shaft 20 is rotated against the resistance of the spring which may turn with it and the arm 35 either moves the sleeve 7 and the roller against the spring 14 or permits this latter spring to move the roller in the opposite direction.

This roller rotates in frictional rotative engagement with a driving disc Ll0. The frame is cast with a downwardly extending conical bearing 51 in which is set a brass or bronze bushing 52 extending from the bottom of the bearing to within a short distance from the top while the upper end of the boring is enlarged to provide a seat for a lubricating washer 52aL upon which, in turn, is seated a Babbitt metal washer 52b having a convex top. The shaft 300 has a l rigid collar 53 which rests on the top of the last-mentioned washer while the cupped washer indicated at 54 is set in the frame and encircles the shaft to retain lubricant inserted in the space 55 above the collar 53.

The portion of the shaft within the bushing is chambered as at 5G to also hold lubricant while the lower end of the shaft is reduced in diameter and screw-threaded as at 57 thus providing a shoulder 58, The disc 10 is 'if preferably constructed of cast-iron with an integral hub 40 and is fastened on this diminished portion of the shaft by a nut 60 which is screwed upon the shaft and clamps the hub of the disc tightly against f7 matically opening the switch, a trip device mounted upon the tone arm and movable in unison therewith coacting with the lastmentioned means in the automatic stopping of the machine.

The individual parts of the unit are mounted upon a carrier plate removably secured upon the plate 62 as at 71, and having a lateral extension 72 upon which the switch 73 is secured. This switch ecnsists of a block of insulation having a lixed contact 74, a spring contact 75 movable to and from engagement therewith and four

terminals

75, 76, 77' and 78, the first two having the leads 79'of the main circuit connected thereto and the second two the leads 8O of the motor circuit.

The means for moving the spring contact 75 into engagement with the fixed contact 74 consists of a cam 8l of insulation which is superimposed upon and rotatable in; unison with the pivoted end of the manually operated starting and stopping lever 82, the free end of which protrudes beyond the periphery of the turn table, the pivoted end being of substantially disc form` as at 82 and, with the cam, being rotatably secured upon the carrier plate by a headed stud 8S. The carrier plate 70 is'also extended beyond the periphery of the turn-table as at 84k and bears the word' On and Off indicating the starting and stopping positions ofi the lever` 82.

The disc-like end 82 of the latter is providedy with an angular extension 85 in which a friction stop 86 of leather or other material having similar properties is mounted, the stop being adaptedl when the lever 82 is in the off position with the switch open, to bear against the inner face of thev peripheralflange 87 on the turn-table and prevent rotation of the latter. Movement of the lever 82 to the on position simultaneously moves the stop away from the flange and closes the switch, setting the motor in motion.

In order to limit the throw of the level` 82 when being moved to the on position for the purpose of protecting the spring contact. and preventing the extension'85 engaging the latter and causing a short circuit, the carrier plate has a lug 88 which is extended upwardly between the contact and the extension forming an abutment in the path of the latter.

The throw of the lever inthe opposite directionvis limited by the free end of trigger arm 90. This trigger is tangentially disposed relatively to the disc end of the lever and is adapted to retain the latter in position closing the switch. It is constituted by the longer arm of a bell-crank lever pivoted upon the carrier plate as at 91, the short arm being indicated at 92)/vv and of" greater width than the trigger arm.

The latter is tapered to a blunt point forming a pawl 91 which bears against the edge of the disc end 82 of the lever 82 and is adapted to snap into position engaging a tooth 100 on the disc when the lever 82 is moved to the on position with the consequent closing of the switch, this engagement of the pawl with the tooth holding the switch closed. In sound reproducing machines heretofore in use having automatic stops it has not been possible to effect a stop at the exact point at which the stop was set, the stoppage usually occurring several grooves ahead of such point. This defect is overcome in the present invention by so constructing the trigger arm 90 and tooth l0() that the former assumes exactly the same position when maintaining the lever 82 in the on position as it does when the lever is in the ofi'`position. rilhe importance of this positioning will be realized when it is explained that the lever 82 is in the olf when the manual adjustment of the stop is effected whereas the lever will be moved to the on7 position before such stop will be called upon to perform its function so that it is essential that the position of the trigger arm 90 be undisturbed by the movement of the lever 82. To this end the disc and lever are notched behind the tooth to provide an abutment edge 82h, which when the lever is in the off position, presents an abutment to the trigger arm coinciding with that presented by the disc 82 and the face lOOa of the tooth when the lever is in the on position, the longer side 100b ofv the tooth and the adjacent side 91a of the trigger arm being correspondingly curved to facilitate this positioning. rlhe engagement between tooth 100 and the pawl 91 is such that although it will positively retain the lever 82 in the on position, if at any time during the playing of the record it is desired to stop the machine, this may be readily accomplished by moving the lever to the olf position, the end of the pawl simply riding over the tooth 100 when pressure is exerted upon the lever 82.

In order to yieldingly maintain the trigger in engagement with the disc 82 without detracting from its sensitivity to the in- Huence of the automatic stopping means it is connected to the disc 82 by a tensional spring 95, the points of connection being constituted by lugs 9G and 97, one being located on the side ofthe disc farthest from the trigger and the other being located upon the latter at a short distance from its free end.

The relative positioning of these lugs is such that with the lever in the off position a straight longitudinal pull is exerted upon the trigger, the spring being disposed parallel thereto. When the lever is moved to the on'position, however, the spring asl'LU lever is limited by a lug 101 on the carrier plate.

It will be observed that the spring in addition to its functions above stated exerts tension upon the lever 82 and its associated 7' parts and consequently7 when the trigger in the releasing operation which T will presently describe is moved to position clear of the tooth 100 the lever will at once snap back to the oft position. The automatic 1" release of the trigger for the purpose of stopping the machine is effected by trip mechanism which acts upon the short lever arm 92.

This mechanism comprises a member 105 hinged upon the free end of such arm and forming an extension thereof, an abutment link 107 pivoted as at 108 upon the free end of the extension member and a 'trip arm 109 mounted upon the tone arm 110. The arm 92 is upwardly offset as at 112 to accommodate the member which is hinged to its underside and an insulating` washer 113 is inserted therebetween. The hinge pin or stud 1141- is provided with a head 115 and is straddled by a spring horseshoe washer 116 inserted between the head and the arm, displacement of the spring being prevented by a locking lug 11'? engaging a notch 118 therein. The purpose of the spring is to produce a frictional grip between the arm 92 and its member 105 which will transmit a releasing thrust on the latter to trigger arm 90 and overcome the lateral pull of the spring 95, at the same time permitting of easy adjustment to any desired position. A lug 105 is formed'on the member 105 and is adapted to engage the adjacent portion of the arm 92 where the member is in its eX- treme position to the right.

The abutment link 107 unlike the other parts of this mechanism already alluded to is not concealed beneath the turn-table but is positioned between the latter and the base of the tone arm and is adjustable upon the stud 108. It is curved concentrically to the centre upon which the tone arm swings and its elongated slot 120 receives the downwardly bent end 121 of the trip arm 109, the latter being secured by screws 122 upon the tone arm.

In order to adjust this trip mechanism the tone arm is moved to the point at which it is desired to stop the machine as indicated in Figure 14 and the abutment link is then shifted to the right until the trip arm engages the left end of the slot 120. The tone arm is subsequently returned to its starting position and the machine is ready to be operated.

In order to provide means for controlling the torque of the motor shaft for the purpose of supplementing the adjustment of the speed of rotation of the turn-table a rheostat or variable resistance 200 is included in the motor circuit. This rheostat is of the usual construction and consists of a resistance tapped at intervals and connected to studs 201 with which a contact arm 202 is adapted to make contact. This arm is insulated from and operated by an adjusting arm 203 fulcrumed as at 201i and having a pointer 205 movable across a dial or graduated plate 206. The latter is provided with an adjustable stop or abutment 207 so that once the desired position of the pointer is ascertained the stop may be liXed to render further reading of the graduation unnecessary. Theresistance is so tapped that the movement of the contact 202 from one stud to the next stud causes anv increase or decrease of twenty volts. This may be varied, however, if desired.

In the embodiment illustrated there are seven studs with which the contact arm 202 may engage. The adjusting arm 203 has a range of movement from the neutral position to F (fast) position as indicated in Figure 1?. The first stud engaged by the arm when moving from the neutral to` the S (slow) position does not include the resistance and consequently the maximum voltage preferably 110 volts is obtained which sets the motor armature in motion. Continued movement of the arm brings it into engagement with the second stud which includes the entire resistance in the circuit and reduces the voltage to 20 volts. This is the slowest speed. Further movement of the arm from stud to stud increases the voltage 20 volts at a time until the maximum is reached.

It will be seen from the foregoing that the speed of rotation of the turntable maybe varied by two independent mechanisms so that a very fine adjustment of the tone of the sound reproduced is possible.

The circular attachment plate 62 is preferably secured in position by clamps 62a fastened to the motor board by screws 62h, felt silencers 62c being Vinserted between clamps and motor board in positions straddling the edge of the attachment plate.

Operation..

The operation of a machine constructed according to my invention is as follows:

A record having been placed in position upon the turn-table the tone arm is positioned at the inner end of the sound groove of the record and the abutment link 107 S il shifted to the right until the trip arm ,109 engages the left end of the slot 120. The tone arm is then returned to its starting position and theswitch 73 closed through lever 82. The closing of the switch sets the motor in Vmotion and through friction roller l2 disc 40 and sha-ft 300 rotating the turn-table 61. As the Vturn table with the record rotates the tone arm of course swings towards the center of the same and this movement causes the trip arm 109 to move towards and finally engage the left end of the slot in the abutment link 107. This 'engagement exerts a thrust upon the short varm of the bell crank lever of which the trigger 90 is a component part, thereby moving the latter away from the disc 82 permitting the latter to snap back to the off position, with the consequent opening of the switch and stopping of the machine.

l/Vhen it is desired to vary the speed of rotation of the turn table the pointer' 32 is moved to t-he graduation indicating the desired speed on the dial 2%, this movement through the shaft 2O and arm 35 moving the friction roller towards or away from the center of the disc l0 and consequently varying the speed at which the latter is driven. Further adjustment may then be obtained by increasing or decreasing the voltage of the current of the motor circuit by adjusting arm 202.

l/Vhat l claim is as follows:

l. In a sound reproducing machine, a driving shaft having a. longitudinal featherway, a disc rotatable on an axis perpendicular to the shaft, a roller mounted on the shaft and rotatable therewith and movable axially thereon, said roller being in rotative engagement with the disc and movable radially relatively thereto, a feather adapted for unisonal movement with said roller and movable longitudinally within said featherway, a spring yieldingly maintaining the roller in position at one end of its axial travel and manually operable means for moving the roller axially against the resistance of the spring.

2. In a sound reproducing machine, a driving mechanism consisting of a rotary disc, a motor having a shaft in juxtaposition with the disc and disposed perpendicularly to the axis thereof, a sleeve mounted upon and in telescopic relation with the end e of the shaft nearest the disc and adapted to normally form an axial extension of the shaft, and to rotate in unison therewith. a roller secured upon that portion of the sleeve which constantly encircles the shaft irrespective of the position of the sleeve, said roller being in rotative engagement with the disc and movable with the sleeve radially relatively to the disc and a spring yieldiiigly maintaining the roller and sleeve at the end of their travel in which they are nearest the axis of the disc, Iand means for moving the roller and sleeve radially relatively to the disc.

3. In a machine -of the tyLpe described, la motor having a shaft, a sleeve mounted upon and in telescopic relation with the free end of the moito-r shaft and adapted to form an axial extension thereof, said motor shaft having a longitudinal featherway, a feather carried by said sleeve and movable longitudin'ally within the featherway, a pair of spaced flanges upon that portion of the sleeve which constantly encircles the motor shaft irrespective of the position of the sleeve, a roller secured upon the sleeve between the flanges, a spring for yieldingly maintaining the sleeve at one end of its axial travel on the shaft, and means for ladjusting the sleeve axially against the resistance of the spring.

4. In a sound reproducing machine, a frame, a motor suspended therefrom and having a shaft, a shaft disposed perpendicularly to the motor shaft and adapted to support a turn table at its upper end, a friction disc secured upon the lower end of the turn table shaft, a sleeve mounted upon and in telescopic relation with Ythe free end of the motor shaft and adapted to normally form an axial extension thereof, said motor shaft having a longitudinal feather-` way, a feather carried by said sleeve and movable longitudinally within the featherway, a pair of spaced flanges upon that portion of the sleeve `which constantly encircles the motor shaft irrespective of the position of the sleeve, a roller secured upon the sleeve between the flanges and in lrotative engagement with the disc, a spring for yieldingly maintaining the sleeve at one end of its axial travel 'on the shaft, and means adapted to engage said sleeve for the purpose of adjusting the roller radially relatively to the disc and against the resistance of the spring.

5. In a sound reproducing machine, a frame, a motor suspended there-from and having a shaft, a shaft disposed perpenn dicularly to the motor shaft and adapted to support a turn table at its upper end, a friction disc secured upon the lower end of the turn table shaft, a sleeve mounted upon and in telescopic relation with the free end of the motor shaft and adapted to normally form an axial extension thereof, said motor shaft having a longitudinal feat-herway, a feather carried by said sleeve and movable longitudinally within the featherway, a pair of spacedianges upon that portion of the sleeve which constantly encircles the motor' shaft irrespective of the position of the sleeve, roller securedv upon the sleeve between the franges and in rotative engagement with the disc, a spring for yield-ingly maintaining," the sleeve at one hill' end ofits axial travel on the shaft, said spring contained within the sleeve and bearing therebetween and the adjacent end of the motor shaft, and means adapted to engage Said sleeve for the purpose of adjusting the roller radially relatively to the disc and against the resistance of the spring.

6. In a sound reproducing machine, a frame, a motor suspended therefrom and having a shaft, a shaft disposed perpendicularly to `the motor shaft and adapted to support a turn table at its upper end, a friction disc secured upon the lower end of the turn table shaft, a sleeve mounted upon and in telescopic relation with the free end of the motor shaft and adapted to normally form an axial extension thereof, said motor shaft having a longitudinal featherway, a feather carried by said sleeve and movable longitudinally within the featherway, a pair 'of spaced flanges upon that portion of the sleeve which constantly encircles the motor shaft irrespective of the position of the sleeve, a roller secured upon the sleeve between the flanges and in rotative engagement with the disc, a spring for yieldingly maintaining the sleeve at one end of its axial travel on the shaft, a point of a comparatively soft material mounted in the free end of said sleeve, and means adapted to engage said point for the purpose of adjusting the roller radially relatively to the disc and against the resistance of the spring.

7. In a sound reproducing machine, a frame, a motor suspended therefrom and having a shaft, a shaft disposed perpendicularly to the motor shaft and adapted to support a turn table at its upper end, a friction disc secured upon the lower end of the turn table shaft, a sleeve mounted upon and in telescopic relation with the free end of the motor shaft and adapted to normally form an axial extension thereof, said motor shaft having a longitudinal featherway, a feather carried by said sleeve and movable longitudinally within the featherway, a pair of spaced flanges upon that portion of the sleeve which constantly encircles the motor shaft irrespective of the position of the sleeve, a roller secured upon the sleeve between the flanges and in rotative engagement with the disc, a spring for yieldingly maintaining the sleeve at one end of its axial travel on the shaft, means adapted to engage said sleeve for the purpose of adjusting the roller radially relatively to the disc and against the resistance of the spring and means for yieldingly maintaining the roller in the adjusted position. i

8. In a sound reproducing machine, a frame, af motor suspended therefrom and having a shaft, a shaft disposed perpendcularly to the moto-r shaft and, adapted to support a turn table at its upper end, a friction disc secured upon the lower endof the turn table shaft, a sleeve mounted upon and in telescopio relation with the free end of the motor shaft and adapted to nor-V mally form an axial extension thereof, said motor shaft having a longitudinal featherway, a feather carried by said sleeve and movable longitudinally within the featherway, a pair of spaced flanges upon that portion of the sleeve which constantly encircles the motor shaft irrespective of the position of the sleeve, a roller secured upon the sleeve between the flanges and in rotative engagement with the disc, a spring for yieldingly maintaining ythe sleeve at one end of its axial travel on the shaft, a point of a comparatively soft material mounted in the free end of said sleeve, means adapted to engage said point for the purpose of adjusting the roller radially relatively to the disc and againstthe resistance of the spring, and means for yieldingly maintaining the roller in the adjusted position.

9. In a sound reproducing machine, a frame, a motor suspended therefrom and having a shaft, a sleeve mounted upon and in telescopic relation with the free end of the motor shaft and adapted to form an axial extension thereof, said motor shaft having a longitudinal featherway, a feather carried by said sleeve and movable longitudinally within the featherway, a pair Vof spaced flanges upon that portion of the sleeve which constantly encircles the motor shaft irrespective of the position of the sleeve, a roller secured upon the sleeve between the flanges,

a spring I for yieldingly maintaining the sleeve at one end of its axial travel on the shaft. and means for adjusting the sleeve axially against the resistance of the spring, j

said last mentioned means consisting of a shaft mounted in said frame and carrying a spring seat, a spring encircling said shaft and bearingtightly between the frame and seat for the purpose of yieldingly maintaining the shaft in any position to which it may be turnedA a curved arm having one end secured to said shaft and having its opposite end disposed substantially at right angles to and in bearing relation with said sleeve and a manually operated adjusting arm connected to said shaft.

l0. In a sound reproducing machine, a frame, a motor, a turn table, means effecting a rotative connection therebetween, said last mentioned means including a friction disc and a roller in rotative engagement with the disc and adjustable radially relatively thereto, and means for radially adjusting said roller, said meansconsisting of a shaft, a curved arm having one end connected to and being carried by said sha-ft and having its opposite end operatively connected to the roller, said shaft having a squared portion, an adjusting arm rigidly mounted upon the squared portion of the shaft., a spring seat carried by said shaft and a spring bearing tightly between the frame and seat and adapted to maintain the shaft in an;Y position to which it may be turned.

l1. In a sound reprodiilcing machine, a frame, a motor. a turn table, means effecting a rotative connection therebetween, said last mentioned means including a friction disc and roller in rotative engagement with t-he disc and adiustable radially relatively thereto and means for radially adjusting said roller. said means consisting of a shaft, an arm having one end connected to said shaft and having its opposite end 0peratively connected to the roller, and adjusting arm secured to said shaft and carrying a pointer and finger-hold at its free end, a graduated dial positioned adjacent said pointer, a spring seat carried by said shaft and con sisting of a pair of slots formed in said shaft diametrically opposite each other, a horseshoe plate straddling` the shaft and seated in said slots and a cup-shaped washer encircling the `shaft and plate and a spring encircling the shaft and bearing tightly between the frame and washer and adapted to maintain the shaft in any position to which it may be turned by said adjusting arm.

l2. In a sound reproducingmachine a supporting` frame having,l an openinO, a bushing vertically positioned within the opening, a motor suspended from said frame. a vertically disposed shaft mounted in said bushing and adapted to support a turn table at its upper end, a lubricating washer encircling the shaft and resting upon the upper end of the bushing.y an anti-friction washer encircling the shaft and resting upon the lubricating washer, and a collar mounted in fixed position upon the shaft and adapted to rest upon the anti-friction washer', the lower end of said shaft being free and re duced and thread-ed, and means effecting a rotative connection between the motor and shaft, said means including` a roller driven by said motor and a disc in frictional engagement with the roller and secured upon the reduced lower end of said shaft.

i3. In a sound reproducing machine a supporting frame having an opening, a bushing` vertically positioned within the opening, a motor suspended from said frame, a vertically disposed shaft mounted in said bushing and adapted to support a turn table at its upper end, a lubricating washer encircling' the shaft and resting upon the upper end of the bushing, an anti-friction washer encircling the shaft and resting upon the lubricating washer, and a collar mounted in .fixed position upon the shaft and adapted to rest upon the anti-friction washer. the lower end of said shaft being free and reduced and threaded and means effecting -arn ative connection between the motor and shaft, said means including a roller driven said motor and a disc in frictional enment with the roller and secured upon the reduced lower end of said shaft, said disc consisting` of a unitary casting having a hub as an intergral part thereof with an opening to receive the reduced lower end of the shaft, and a nut screwed upon said reduced end and clamping the disc in position thereon,

le. In a sound reproducing' machine a turntable, a motor for driving the same, and means for starting and automatically stopping the motor consisting of a circuit including the motor and a switch adapted to spring open, a manually operated lever for closing the switch, a trigger pawl adapted to engage the lever for the purpose of maintain-ing the latter in position with the switch closed, means for yieldingly maintaining the lever and pawl in engagement wit-h each other, and means for moving the pawl away from the lever when the latter is in position closing the switch for the purpose of releasing the switch.

l5'. In a sound reproducing machine a turntable, a motor for drivingthe same, and means for starting and automatically stopping' the motor, consisting of a circuit including the motor, a switch included in the circuit and consisting` of a fixed contact and a spring contact adapted to be moved into engagement therewith, a cam adapted to move the movable contact, a manually operated lever for actuating the cam, means for retaining the lever in position closing the switch, and means for automatically releasing the lever.

16. In a sound reproducing machine, a tone arm, a. turntable, a motor for driving the same and means for starting and automatically stopping' the motor, consisting of a circuit including the motor and a switch adapted to spring open, a manually operated lever for closing the switch, a trigger pawl adapted to engage the lever for the purpose of maintaining' the lever in position with the switch closed, means for yieldingly maintaining the lever and pawl in engagement with each other, and trip mechanism actuated by the tone arm for moving the pawl away from the lever when the latter is in position closing the switch for t-he purpose of releasing the switch.

17. In a sound reproducing machine a tone arm. a turntable, a motor for driving the same, and means for starting and automatically stopping` the motor consisting of a circuit including the motor, a switch included in the circuit and consisting of a fixed contact and a spring contact adapted to be moved into engagement therewitln a cam adapted to move the movable contact, a

manually operated lever for actuating the cam, means for retaining the lever in position closing the switch, and trip mechanism actuated by the tone arm :tor automatically releasing the lever.

18. In a sound reproducing machine a turntable, a motor tor driving the same, and means for starting and automatically stopping the motor consisting ott a circuit including the motor, a switch included in the circuit and consisting oit a. fixed contact and a spring contact adapted to be moved into engagement therewith, a cam adapted to move the movable contact, a manually operated lever for actuating the cam, a trigger pawl adapted to engage the lever for the purpose ot' maintaining the lever in position with the switch closed, means for yieldingly maintaining the lever and pawl in engagement with each other, and means tor moving the pawl away from the lever when the latter is in position closing the switch for the purpose of releasing the switch.

19. In a sound reproducing machine a tone arm, a turntable, a motor for driving the same, and means for starting and automatically stopping the motor, consisting of a circuit including the motor, a switch included in the circuit and consisting of a iixed contact and a spring contact adapted to be moved into engagement therewith, a cam adapted to move the movable contact, a manually operated lever for actuating the cam, said lever having a tooth, a trigger pawl adapted to engage the tooth, means for yieldingly maintainingthe lever and pawl in engagement with each other, and means for moving the pawl away from the lever when'the latter is in position closing the switch, said last mentioned means consisting of trip mechanism actuated by the tone arm and operatively connected to the pawl.

20. ln a sound reproducing machine a tone arm. a turntable, a motor for driving the same, and means for starting and automatically stopping the motor, consisting of an electric circuit including the motor and a switch, a manually operated switch closing member, a bell-crank lever having a trigger arm adapted to retain the switch closing member in position with the switch closed, a spring yieldingly maintaining the trigger arm in engagement with said member, and trip mechanism actuated by the tone arm and operatively connected to the other arm of the bell-crank lever.

21. n a sound reproducing machine, a turntable, means for rotating the same, movable means adapted, when in one position, to prevent rotation of the turntable and when in another position to permit such rotation, a pawl adapted to yieldingly maintain the last mentioned means in position permitting rotation of the turntable, and an adjustable trip operatively connected to the pawl for automatically releasing the said last mentioned means, the adjustment of said trip being unaffected by movement of said lastmentioned means.

22. In a sound reproducing machine a turntable, a motor for driving the same, and means for starting and automatically stopping the motor consisting o1c a circuit including the motor. a switch included in the circuit and consisting ot' a iiXed contact and a spring contact adapted to be moved into engagement therewith, a cam adapted to move the spring contact, a manually operated lever tor actuating the cam, said lever having a toothed portion, a bell-crank lever one arm of which constitutes a pawl adapted to engage the toothed portion for the purpose of retaining the lever in position closing the switch, a spring yieldingly maintaining the pawl and manually operated lever in engagement with each other, and trip mechanism operatively connected to the other arm of the bell crank and adapted to move the pawl away from the lever for the purpose of automatically opening the switch.

23. In a sound reproducing machine a tone arm, a turntable, a motor for driving the same, and means for starting and auto- Y matically stopping the motor consisting of a circuit including the motor, a. switch included in the circuit and consisting ot a fixed contact and a spring contact adapted to be moved into engagement therewith, a cam adapted to move the spring contact, a manually operated lever for actuating the cam, said lever having an irregular edge, a bellcrank lever one arm of which constitutes a pawl adapted to engage the said edge for the purpose of retaining the lever in position closing the switch, the irregularity of said edge being such that the position of the pawl when retaining the lever in position closing the switch is exactly-the same as its position after the lever has been released, a spring yieldingly maintaining the pawl and manually operated lever in engagement with each other, and trip mechanism operatively connected to the other arm of the bell crank and adapted to move the pawl away from the lever for the purpose of automatically opening the switch, said trip mechanism consisting of a member adjustably mounted upon the said other arm of the bell crank, means for creating frictional resistance to relative movement between the member and said last-mentioned arm, an abutment adjustably mounted upon said member, and a trip mounted upon the tone arm and movable in a path intersected by the abutment.

24. In a sound reproducing machine a movable tone arm, a turntable, a motor for driving the turntable, and means for starting and automatically stopping the motor, consisting of an electric circuit including the maar@ motor and a' Switch. means fer, Closing: the

upon and movable with the tone arm ,and-an adjustable abut-ment located 'in the path 4of thetrip arm and operatively connected to.y the switch closing means.

25` A unitary attachment for sound reproducing machines consisting of antattachment plate, a switchmountedIupon the attachment plate, a manually operated'switchclosing member pivoted upon the attachment plate, a bell crank lever pivoted upon the attachment plate and having a trigger arm adapted to retain the switch closing member in position with the switch closed, means for yieldingly connecting the switch-closing member and trigger arm, and an adjustable device mounted upon the other arm of the bell crank lever and adapted when subjected to a slight thrust to release the switch-closing member from the trigger arm permitting the opening of the switch.

26. A unitary attachment for sound reproducing machines comprising an attachment plate, al switch mounted upon the attachment plate and having a fixed Contact and a spring contact movable to and from engagement with the iXed contact, a manually operated lever having one end enlarged and pivoted upon the attachment plate, such enlarged end being notched, -a cam of insulating material rigidly mounted upon said enlarged end and movable in unison therewith, and adapted to move said spring contact, a turn table engaging stop mounted upon said lever and movable in unison therewith, a bell crank lever pivoted upon the attachment plate and having a trigger arm terminating in apawl adapted to engage an irregular portion of said lever end for the purpose of retaining the latter in position closing the switch, a spring effecting a yielding connection between the trigger arm and said lever and adapted to maintain the same in bearing relation with each other, a trip device adjustably mounted upon the other arm of said bell crank lever, said device consisting of a member pivoted upon the said arm and insulated therefrom, means for creating a frictional resistance to relative movement therebetween and an abutment link pivoted upon said member.

27. In a sound reproducing machine, a frame having a vertical bear-ing comprising a bore having a portion of increased diameter to provide a seat, a lubricating washer positioned upon said seat, an anti-friction washer positioned upon said lubricating washer, a motor suspended from said frame, a vertically disposed shaft rotatably mounted in said bearing, said shaft having a collar adapted to rest upon said seat and having a reduced lower end which is threaded and projects beyond the lower end of the bore,

and means rotatively connecting@themotor toA the shaift consisting of'V agrloller on thel motor shaft and a disc in frictional 'engages ment with the roller-and monntedu-pon the. reduced Iend of thel shaft, and ainut screwed upon said end and securing the disc mpi-lace...

28. In a sound; reprodnc,ing` machine,v a frame, hav-ing av verticaljbeaA comprising a bore having .f a portion .of increased di;n ameter to. provide a seat, aI lubricating washer` positioned uponvsaid-seat, arr-anti;Y friction washer positioned upon said lubricating washer, a motor suspended from said frame, a vertically disposed shaft rotatably mounted in said bearing, said shaft having a collar adapted to rest upon said anti-friction washer and having a reduced lower end which is threaded and projects beyond the lower end of the bore, and means rotatively connecting the motor to the shaft consisting of a roller on the motor shaft and a disc in frictional engagement with the roller and mounted upon the reduced end of the shaft, and a nut screwed upon said end and securing the disc in place.

29. In a sound reproducing machine, frame having a bearing comprising a conical enlargen'ient forming an integral part of the frame, such enlargement having a vertical boring therethrough, the end of which is of increased diameter to provide a pair of annular seats one located at the extreme upper end and the other at a slight distance beneath the same, a bushing mounted in the reduced portion of said boring with its upper end forming a seat, a lubricating washer' positioned upon said seat, an antifriction washer positioned upon said lubricating washer, a shaft rotatably mounted in said bushing and having a collar adapted to rest upon the top of the anti-friction washer for the purpose of limiting downward movement of the shaft, that portion of the shaft within the bushing being reduced to provide a lubricating chamber, and a cupped washer located upon the upper seat in position encircling the shaft and adapted to retain a lubricant within the encircling space, a turn table mounted upon the upper end of the shaft, and means for driving the shaft.

30. In a sound reproducing machine a motor board having an opening therein, and a unit adapted to be mounted thereon in position within the opening said unit consisting of a circular attachment plate of a diameter larger than the opening and. adapted to rest upon the top of the motor board, a frame connected to the attachment plate, a turntable shaft mounted in the frame, a motor suspended from the frame, a friction drive between the motor and shaft, and mechanism mounted upon the attachment plate for start-ing and automatically stopping the motor.

3l. In a sound reproducing machine, a

turntable, a motor for driving the same, an electric circuit including said motor, and means for adjusting the speed of rotation of the turntable, said means consisting of a variable resistance included in the motor circuit.

32.-In a sound reproducing machine, a turntable, a turntable shaft, a motor, a friction drive between said motor and shaft, means for relatively adjusting the friction elements for Varying the speed of rotation of the turntable' and means for varying the said speed independently of the said adjust ing means, consisting of a variable resistance included in the motor circuit.

In testimony whereof I have signed my name to this specification in the presence of two Witnesses. l

ELMR A. FARMER. Witnesses:

GORDON G. COOKE, HARRIETTE MCDONALD.