US1508827A

US1508827A - Driving mechanism for phonographs

Info

Publication number: US1508827A
Application number: US660711A
Authority: US
Inventors: Louis P Valiquet
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-09-04
Filing date: 1923-09-04
Publication date: 1924-09-16
Anticipated expiration: 1941-09-16

Description

Filed Sont. 4. 1923 3 Sheets-Sheet 1 nhs 3 Sheets-Sheet 2 Inf/@Mor fw/2 f1 W A M d gay Sepe. 16, 1924,

L.. P. VALIQUET DRIVING IIECHANISII FOR PHONOGRAPHS Filed Sont. 4. 1923 Sept. 16 1924, 1,508,827

A L. P. vALlQUE-r DRIVING MECHANISM FOR PHONOGRAPHS Filed SDt. 4. 1923 3 Sheets-Sheet 3 y MM@ iss rss-PATENT o FFlcs.

. i l 'I LQUIS P. VALIQUET, F CHICAGO, ILLINOIS.

DRIVING HECHANISH FOB PHONOGBAPHS.

. Application led September 4, 19123. Serial No. 680,711.

To all whom it may concern.'

Be it known that I', Louis P. Vmotm'r, a, citizen of` the United States, and a resident. of Chicago, in the county of Cook and State of Illinois, have invented certainnew and useful Improvements in Driving Mechanism for Phonographs, of which the following is a full, clear, and exact description. y

The present invention relates to motoroperated driving mechanism for talking machines and its primary object is te pro' vide improved driving mechanism by which the talking machine record will be driven at a uniform speed despitevariations in the speed of the motor, resultin from uctuations in the current sup li to the motor. The invention consists 11i the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Fig. 1v is an inverted pwlan of mechanism embodying the invention. ig. 2 is a diagram of the electrical` connections. Fig. 3 is a side elevation, parts being shown in section. Fig. 4 is a section taken on line 4-4 of Fig. 3. Fig. v5 is a longitudinal section of the governor for citting one resistance coil into and out of the motor circuit. Fi 6 is a section on line 6--6 of Fig. 5. i 7 is a vertical axial section through the s ip joint throu h which the turn-table shaft 11 1s driven. ig. 8 is a section on line 8-8 of Fig. 5. j

In the exemplification of the invention illustrated, the driving mechanism is all mounted on and supported by a frame or bed-plate 9. The record turn-table 10 is mounted on and rotated by a vertical shaft llwhich is driven by power derived from an electric motor 12 which is suitably secured to the underside ofl frame 9. The armature shaft 13 of motor 12 carries a ily-wheel 14 and drives a shaft 15 through a flexible coupling 16 of well-known construction. Shaft 15 is su ported in bearings 18 of a housing 17 whic depends from and is fixed to the underside of frame 9. An adjustable screw 19 forms a thrust bearin for the vertical shaft 11. A worm 20, cut 1n shaft 15, meshes with a worm-wheel 21 which is loose on shaft 11 and forms one member of a slip joint through which shaft 11 is driven. Gear 21 is mounted between and engages with two fibre `

frietion disks

22 and 23 which are also loose on shaft 11. A A metal disk 24 engages fibre disk 22 and a'disk 25 integral with shaft 11.

' engages fibre disk 23. A pin 26, rigid with shaft 11, haslitsends projecting into notches 1n disk 24 to rotate the disk with the shaft. and permits slight relative axial movement. between the disk and theshaft. A plate 27 is provided with spring-fingers 28, which bearupon disk 24 to maintain the required friction or pressurebetween the members of the slip joint. A nut 29 threaded to shaft 11 may be adjusted to regulate the pressure of fingers 28 against disk 24 to correspondingly regulate the friction between the members of the slip joint. A plate 30 is held in housing 17 by a screw 31 and forms the top of the chamber containing the slip joint so that alubr-ieant of suitable viscosity will be retained in said chamber. An oblique toothed gear 32 is fixed to shaft .l1 and meshes with fa worm 33 cut on a shaft 34 to operate a speed or vgovernor controlled braking device. Shaft 34 is supported in bearings 35 mounted in lugs 36 which depend from the frame 9.

y This governor comprises a disk 37 slidable onfshaft 34, a collar 38 fixed on said shaft, leaf-springs 39 connecting collars 38 and the hub of disk 37, and weights 40 attached to the springs. A friction pad 41, mounted on an arm 42, cooperates with said disk to con` trol its speed so that when the speed of shaft 34 becomes excessive, disk 37 will conta-ct with pad 41 to act as a drag on the shaft 11. Arm 42 is pivoted, as at`43, to frame 9 and at its opposite end is provided with a slot 44 into which projects a pin 45 dependingfrom' a shaft 46 which extends through and is journalled in frame 9 and toathe upper end of which is secured an adjusting handlel t 47. By adjusting the handle to shift thai.'A

brake-pad 41 to or from the governor dis 37, the relation between the disk 37 and'l brake-pad 41 may be varied to render then;

' ernorcontrolled brakin `Durin this operation, t e resistance coil a normal 110 volt supply circuitare known to vary. sometimes dropping to `as low as 75 or 80 volts when the peak load is placed on the generating syst-em and at other times, under a minimum load, the voltage increases somewhat above the normal. To compensate for these variations,rthe motor 12 is wound to maintainthe maximum speed desired for the turn-table at a voltage lower than the minimum in the supply circuit and a resistance coil 5() is included in the normalcircuit to the motor.- The ,supply circuit is exemplilied in F ig. 2 by a condurtor 51 connected to one end of Acoil 50, a

conductor 52 between the other end of said`- coil'and a binding post 53, a switch comprising a contact 58 connected to said post and Ya contact) 59 `connectedto--a binding c `post 60, a conductor 54 between the post andthe motor and a leading-in conductor 55. A second resistance coil 56 isincluded in a conductor 57 between the mot-or and a binding post 53. The switch 58,` 59 is governor-controlledand is normally closed to furnish a direct path between coil 50 and motor 12 through its contacts, and when open, interrupts said path, so that the circuitfwill include conductor 57 and resistance coil 56.

A governor for said switch comprises a hub 61, which is ,ixed to a shaft 15, a `pair of arms 62, 63 pivoted in said' hub at 64: and 65 respectively, weights 66 secured to saidarins respectively, 'and a stud-shaft 67 1 slidably mounted in shaft 15 and provided with an abutment 68 adapted to be shifted outwardly by surfaces 69 on arms l62 and 63, to operate switch-contact 59 against the force of a coil spring 68 which is held to act on abutment 68 by a governor housing 73.

Coils

50 and 56 are suitabl secured to the under side o frame 9. oil 50 is of sulcient resistance to reduce the maximum voltage of a 110 volt line to about 80 volts. Coil-56 is of sucient resistance to further reduce the voltage when that becomes necessary tomaintain the desired predetermined speed. Binding posts 53 and 60 and

switch contacts

58 and 59 are suitablyA secured to a block 70 o insulation-which is fixed to the trame 9. A. switch 71 of any suitable-construction is provided to control the startin@ and stopping of the motor.

n operation, the closing of .switch 71 will establish a circuit` including 'conductor 51,`resistaiice coil 50, conductor 52, post 53, normally closed

switch contacts

58, 59, post 60, conductor 54, motor 12, and conductor 55. This circuit isN retained until the motor` hasl acquired itsdesired speed, and the motor will drive the 'table through the slip connection and under control of

govdevice

37, 41.

50' re uces the voltage of the current passing through the motor 12 to avoid excessive l speed. The motor will rapidly pick up its speed while resistance 56 is'cut out, but thereafter and as soon as the motor has acquired its predetermined speed, the governor onshaft 15 'will operate stud 67 to separate contact-s 59,- 58, thus opening the circuit cuit the additional resistance coil 56 and conductor 57, tocause the motor-to operate lappioximately at its normal speed. As aresult. provision is made for-substantially therethrough and including in the motor cirv equalizing the speed of the. motor `as well. f

speed of ,the record-carrying table driven y through said connection.

In practice, it has been produce smooth-running driving mechanism found that res istances in the circuit are insuilicient -to and that brakes alone are not efiicient for 7 ,that purpose, and that by combining the resistance control for the voltage of the circuit and a brake for the elements driven through a slip-connection great uniformity in speed of the turn-table can be attained.

The invention exemp'lies motor-driven mechanism for driving a` phono laph in which the record is driven throug connection with resistancel means for causa slip- ,965,

ing uniformity 'in the speed of the motor.'v

and the drive member of the connection and with braking means for causing uniformity inthe speed of the table driven through the slip-connection. As a result of combining these instrumentalities in the driving mechanism, irregularities in the operation of the record vare effectively avoided.

The invention is not to be understood as l restricted `to the details set forth, but maybe modified within the scope of the ap.

pended claims, without departing from the scope of the invention.

l claim i 1. ln drivin mechanism for talking inachines, the com ination of an electric motor, a record turn-table, a slip-connection connected to drive said turn-table, gearing between the motor and the slip connection, an electric circuit for said motor, a 'resistance connected to saidV circuit, speed-controlled means for automatically cutting the resistance into and out of the circuit and speed-l l controlled means applied between the slip connection and the turn-table for re lating the speed at which the turn-ta le is driven through the slip. connection. Y

2. ln driving mechanism for talking machines, the combination of an electric motor, a record turn-table, a slip-connection connected vto drive said turn-table, gearing betweenthe motor and the slip connection, an electric'circuit for said motor, a :resistanceV connected to said circuit, speed-controlled means for automatically p cutting the resistance into and out of the circuit and speeda record turn-table, a shaft forl said table,"

a slip-connection connected to drive said shaft, gearing between the motor and the slip-connection, an electric circuit for said motor, a resistance connected to said circuit, speed-controlled means for automatically cutting the resistance into and out of the circuit, and speed-controlled means driven by the slip-connection for retarding the turn-table through the slip connection.

4. In driving mechanism for talking machines, the combination of an electric motor, a record turn-table, a shaft for said table, a slip-connection connected. to drive said shaft, gearing between the motor and the slip-connection, an electric circuit for said motor, a` resistance-coil connectedv to said circuit, a speedcontrolled switch operated by the motor for cutting the resistance into and out of the circuit anda brake for retarding the turn-table driven by the driven element of the slip-connection and appliedy between said connection and the turn-table.

5. In driving mechanism for talking machines, the combination of an electric motor, a recordturn-table, a shaft for said table, a slip-connection connected to drive said shaft, gearing between the motor and the slip-connection, an electric circuit for said motor, a resistance-coil connected to said circuit, a speed-controlled switch for cutting the resistance into and out of the circuit, a brake for retarding the turn-table throu hv the slip-connection and a speed- Acontro led governor driven through the slipconnection for operating the brake.

loperating the brake.

6. In driving mechanism for talking machines, the combination of an electric motor, a record turn-table, a shaft for said table, a slip-connection connected to drive said shaft, gearing between the motor and the slip-connection, an electric circuit for said motor, a resistance-coil connected to said circuit, a speed-controlled Vgovernor driven by the motor, a switch operated by the governor for cutting the resistance into and out of the circuit, a brake for retarding the turntable through the slip-connection and a speed-controlled governor driven through the slip-connection foroperating the brake.

7. In driving mechanism Ifor talking machines, the combination of an electric motor, a record turn-table, a sliplconnection connected to drive said turn-table, gearing between the motor and the slip-connection, an electric circuitfor said motor, a plurality of resistance coils, one of which is constantly in said circuit, a switch for cutting the other resistance-into and out of the circuit, a speed-controlled governor for operating said switch, and aspeed-controlled brake retarding the speed of the shaft.

8. In driving mechanism for talking machines,l the combination of an electric motor, a record turn-table, a shaft for Said table, a slip-connection 'connected to drive said shaft, gearing between the motor and the slip connection, an electric circuit for said motor, a plurality of resistance coils, one of which is constantly in said circuit, a switch for cutting the other resistance into and out of the circuit, a speed-controlled governor for operating said switch, a brake for retarding the speed of the shaft, and a gover.

nor controlle by the speed of the shaft for Illinois this 7th day LOUIS P. VALIQUET.

Signed at Chicago, of Aug. 1923.