US1339203A - Automatic stop and start for phonographs - Google Patents

Description

P. M. KREE AND F.DAUTEUIL. AUTOMATIC STOP AND START FOR PHONOGRAPHS.

APPLICATION FILED JULY 28.1919.

Patented May 4, 1920.

lNVNTOR ITED STATE-S rAT NT OFFICE.

' PAUL in. KREE AND FERNAND DAUTEUIL, or new YORK, n. Y.

and Startrfor Phonographs; of which the following is va full, clear, and exact description. V

Our invention relates to. a mechanism for automatically starting and stopping the movement of a record and it has reference i more particularly to a device comprising an electromagnetic mechanism, the currents of which are controlledby the record.

It is also the object 'ofthis invention to provide a device of the class mentioned which can be easily attached to any phonograph on the market, .7

A practical embodiment of our invention is illustrated in the accompanying drawings forming part of the specification, in which similar characters of reference indicate correspondlngparts in all the views.

Figure lis a fragmentary top plan view of a phonograph equipped with our device.

Fig. 2 is anaxial section through a phonographequipped with our device. 7

. Fig. '3 is a detailed illustration of the electromagnetic control of the brake mechanism, and

' Fig. 4 is an electrical diagram showing the circuits of the device. 7

Referring to the drawings 5 is a turn table forming the support for a record 6. The turn table is providedwith a sleeve 7 which is free to slide axially in the table and which has the necessary means for engaging the driving shaft 8 of the motor 9 of the phonograph. The sleeve 7 is also free to slide on the driving shaft 8. The end of the sleeve 7 extending into the case'of the phonograph is engaged witha forked end 10 of an arm 11 pivotally mounted within the case of the phonograph, as shown it is being pivoted on the motor 9. A tension spring 12 is provided at the other end of the arm so that normally the forked end tends to raise the sleeve above the surface of the table 5. The

tensionspring 12 being of such a resistance that the weightof the record 6 is sufficient to depress the sleeve into the position shown in Fig. 2, that is, flush with the table.

The forked end of the arm 11 is adapted Specification of Letters Patent.

M. as... and

. suitable member 13.

wire 26 to a source of electricity 27.

AUTOMATIC s'ror AND s'rARrron rHonoGnArns.

Patented -May 4, .1920.-

Application filed ul 28, 1919. Serial No. 313,7521

to engage a stationary contact 13 in its downward movement and close a circuit to electromagnets 14 mounted in a suitable frame 15.. (See Fig. The forked end of the arm 10 is insulated from the sleeve by a The return movement of theforked end 10 of the arm 11 does not close a circuit for an insulating member 16 is provided to prevent contact. The circuit being closed .only for a short interval of time-is sufficient to energize the magnet and operate thev yieldingbarl'? andcause the displacement of the bellcrank arm 18 which carriesa brake member 19v (see-Fig. 3) and disengage orfreethe table and allow the motor9 of the phonograph to startthe rotation of the table.

' The displacement of the bell crank lever 18 must only be very slight for a spring 20 aidsfurthermovement of the lever as soon The electromagnets 14 are supplied with current from a battery 21. located in a suitable place within the case of thephonograph and connected by wires 22 and 23 as best shown in the diagram in ,Figrk- The record 6 carries a metallic segment 24 in proximity of the end of the sound groove of the record. This segment is grounded by its engagement with the driving shaft 8 of the motor, the tone arm 25 being mounted on the wooden case of the phonographjwhich is insulated. It is connected by means elf a he same source is also connected by a wire 28 to a set of coils 29, mounted on the frame 15 to facethe coils 14. These electromagnets influence the yielding bar 17 in a direction opposite to that of the coils 14.

The metallic needle carried by the stylus bar. coming in contact with the segment 24 will close the circuit of the source 27 cans ing thev electromagnets 29fto be energized thereby attracting the bar 17 in consequence applying the brake against the table 5 and stopping the record. The brake will remain in engagement with the turn table until a new record or the same record will be replaced onthe table so as to cause an engagement between the forked end 10 with the contact 13 tooperate the brake in the maning the segment 24 part or" the needle, While the brake will remain applied against the table 5 under the action of the spring 20. We claim:

1. In a phonograph having a revolvingtable and a brake mechanism for same, of a sleeve mounted to move axially 1n the table,

yielding means for resisting the movement.

of the sleeve and so arranged that said yielding means are adapted to be depresse dwhen a record is placed on the table, electromagnetically operable means for operating the brake mechanism to apply or release the same, and means operable by the movement of the yielding means for controlling the circuit to the electromagneticmeans.

2. In a talking machine a turn table hav- 1 mg a sleeve adapted to move axially, SfllCl' sleeve having means for engaging the driving shaft of the phonograph movement to turn therewith and to slideon said shaft a" I 1 V pivotally mounted arm having one end 111: engagement with said sleeve, a tensionspring associated with the other endof said arm so that normally saidarm tends to" 'ing the driving shaft of electromagnetic means for disengaging the brake from the table, open circuits for said electromagnetic means, means movable axially relative to the table for closing the circuit to the electromag1iets,'means for disengaging the brake from the table, and means adapted to'be carried by the record and 'cobperate'with the needle of the sound box for closing the circuit of theelectromagnets to bringfthe brake into engagement with the table. 7 V Y i 4:. In a phonograph a table mounted to .7

revolve, a sleeve in saidtable mounted to move axially-and having means for engagthe motor of vthe phonograph andto slide thereon, yielding meansl normallyltending to maintain the sleeve abovethe table said yielding means being adapted to allow the displacement of said sleeve when a record isplaced on the 'table, a pair of oppositely disposed'electromagnets; a; yieldingfibar adapted to be influenced by sald electromagnets, Va-cbrake mechanism for thetable'connected to said yielding baigan open circuit for oneioiisa id V electromagnets;means for closing the said cir'cuit operable by the downward movement of the sleeve; wherebyqsaid brake mechanism is operated so as tozrdisengage the table, an open clrcult for the' iother, electromagnets I and meansicarried-by' the record and. the

tone arm for closing the circuit to cause said electromagnet to' influence the yielding bar to bring the brakeinto engagement with 1 the table; V V

' VPAULM. KREE. FERNAND nanrnmn

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