US1399327A - Phonograph-stop - Google Patents

Description

E. J. TOMLINSON.

PHONOGRAIPH STOP.

APPLICATION FILED OCT. 27. I919.

Patented Dec. 6, 1921.

2 SHEETS-SHEET l.

INVENTOR A TTOR/VEY 2 E. J. TOML|NSON..

PHONOGRAVPH STOP,

APPLICATION FILED OCT. 21. 1919.

Patented Dec; 6, 1921.

2 SHEETS-SHEET 2- INVENTOR EDWHFEU J WL/NEUA/ UNITED STATES PATENT QFFIQE.

EDWARD J. TOMLINSON, OF NEWARK, NEW JERSEY. ASSIGNOR T'O SPLITDQBF ELEC- TRICAL COMPANY, OF NEWARK, NEW JERSEY.

PHONOGRAPH-STOP.

Application filed October 27, 1919.

T 0 all whom it may concern:

Be it known that I, EDWARD J. TOMLIN- soN, a citizen of the United States, residing at Newark, in the county of Essex, State of New Jersey, have invented certain new and useful Improvements in a Phonograph-Stop, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

This invention relates to a stop for phonographs and as illustrated is particularly adapted for use in connectionv with an electrically operated one.

It is the principal object of my invention to provide an automatic stop for a phonograph so that after the sound record has been played the stopping mechanism will'be automatically brought into play thereby preventing the motor from driving the record and injuring both it and the needle.

As illustrated in the drawings, my automatic stop is particularly adapted for .use in connection with the type of motor shown in my application, Serial No. 308,840, filed July 5, 1919, although it will be understood that it may be applied to other types. of motors.

In the drawings, Figure 1 illustrates the end of a tone arm carrying the reproducer and one form of stopping mechanism.

Fig. 2 is an end view of Fig. 1.

Fig. 3 is a diagrammatic view of the electrical circuit showing the application to an electrically operated motor.

Fig. 4 is a side view of the tone arm showing another form of stop.

ig. 5 is a bottom view of Fig. e.

Fig. 6 is a view similar to Fig. 1 but with the stopping mechanism in another position of operation. 7

Fig. '7 shows a detail of part of the stopping mechanism.

Referring now to the details, wherein like numbers refer to corresponding parts in the various views, 1 illustrates a tone arm to which reproducer 2 is attached. The reproducer carries the usual playing needle 3 which is shown in Fig. 1 in contact with the sound record body 4. Attached to the tone arm 1 by a stud 5 is a light flexible member 6, the member 6 being pivoted on the stud 5. The end of the flexible member carries a second needle 7. The needle 7 may be carried at the end of member 6 in any Suitable Specification of Letters latent.

Patented Dec. 6, 1921.

Serial No. 383,800.

manner so that if necessary it may be re moved for renewal, although the pressure of needle '7 on the sound record body 1 is e t-remely light for a purpose hereinafter referred to. v

The end of the member 6 is preferably covered with. a layer of tape 8 so as to deaden any vibration that may be picked up by the needle 7 and transmitted to the tone arm through the mounting stud 5. The me 6 dle 7 is held in displaced position with reference to needle 3 as shown in 2, by means of a spring 9, the tension of which is adjusted by screw 10, I

As shown diagrammatically 11.. Fig. 3.11 illustrates the motor or motor winding which operates thephonograph, 12 being circuit breaker and 13 a governor, both used for actuating and controlling the motor 11 at the proper time, all set forth in my application above referred to. 14 illust' an electromagnet which controls the and stopping switch of the motor 1 switch 15 is'illustrated in circuit electromagnet 14:- Astop it is carried by the tone arm 1 but insulated therefrom and extending from the stop 16 is a conductor 1'7 extending to the electroma net 1e The end of the 6 i. bent so as to have an end 18 adapted to engage the stop 16 and when such engagement is made it will be seen that a circuit is closed from the source of current B through the stopping electromagnet 141, stop 16 and member 6- Inoperation, when the playing needle 3 is placed in position "on the sound record body and the phonograph started, the needle "7- will trail along. behind the playing needle 3', as shown Fig. 2, but with very light pressure on the record not to in jure it in any manner. in the construction of sound records. several-grooves are'l t blank on the record and the playing needle 3 when it reaches the end of these blank grooves can carry the tone arm. no farther inward toward the certer of the sound record body out the needle 7 being. free to move about the pivot stud 5 will swing on the pivot until the end 18 comes in contact with stop 16 thereby closing the electrical circuit through the stoppingmagnet 14. which will operate and release the switch controlling the starting and stopping of the phonograph motor.

In order to overcome any objection to a second needle such as 7 running over the record, I have provided an arrangement such as shown in Figs. 4.- to7 inclusive, wherein the needle 7 is held out of engagement with the sound record body until after the record has been played. This is brought about by means of a bracket 19 carried on part of the phonograph independent from the tone arm and which bracket has an arm 20 with upturned edges 21. The end 18 of light member 6 is adapted to binormally held underneath the arm 20, as s own in Fig. 4, thereby holding the member 6 so that the needle 7 is kept out of engagement with the sound record body 4, but as soon as the tone arm 1 has moved to a predetermined position the end 18 of the member 6 will pass from under the arm 20, as shown in Fig. 5,and the needle 7 will be carried onto the ound record body 4 by means of a spring 22. This particular movement of the arm 6 is brought about just before the needle 3 reaches the end of the dead grooves in the sound record body. The needle 7 when it is dropped onto the record is in a displaced position, shown in Fig. 5, and as heretofore described with reference to Figs. 1 and 2. It will then be moved about its pivotal mounting 23 against the tension of spring 24 that normally holds it in its displaced position. The pivotal stud 23 is held to the tone arm by a bracket 25 in an suitable manner, such as by screws 26. ontinued rotation of the sound record body will carry the member 6 to the dotted position 27, whereby the end 18 of the memher 6 will engage the stop 16 with the results heretofore explained.

It will be understood that various changes may be made in the details relating to my invention without departing from the spirit of the same and the scope of the appended claims. r

Having thus described myinvention, what I claim is V 1. In a phonograph, the combination of a sound record bod motor means for driving said sound recor body, a tone arm carrying a reproducer having a playing needle,means for stopping said motor means and a second needle carried by the tone arm for actuating the stopping means, but normally out of engagement with the sound record body,

means for dropping the second mentioned needle onto the sound record body after the playing needle has finished playing the rec ord, said sound record body acting to move the second needle, after it has been dropped into engagement therewith, to a position for bringing said stopping means into opera tion. 1

2. In a phonograph, the combination'of a sound record body, motor means for driving said sound record body, a tone arm carrying a reproducenhaving a playing needle, means for stopping said motor means and a second needle for actuating the stopping means pivotally mounted on the tone arm, means for holding said second needle out of engagement with the sound record body until after the record has been played by the first needle and then releasing it, means for moving the second needle onto the sound record body after it has been released, said sound record body acting to rotate the second needle to a position where it actuates the stopping means as described.

3. In a phonograph, the combination of a sound record body, motor means for driving said sound record body, a tone arm carrying a reproducer having a playing needle, means for stopping said motor means and a second needle normally out of engagement with the sound record body for actuating the stopping means but pivotally mounted on the tone arm for movement in two directions, means independent of the tone arm forholding said second needle from movement toward the sound record until after the record has been played and then releasing it, means carried on the tone arm for moving the second needle about its pivot onto the.

sound record body after it has been released by said holding means, said sound record body acting on the second needle to move it in another direction about its pivot wherey it brings said stoppin means into opera- .tion.

4:. Ina phonograph, the combination of a sound record body, motor means for driving said sound record body, tone arm carrying a reproducer having a playing needle,means for stopping said motor means and a second needle carried by the tone arm but operated by the sound record body for bringing said stopping means into operation, and means associated with the second needle todeaden sound vibrations transmitted sound record'body. V

5. In a phonograph, the combination of a sound record body, motor means for driving said sound record body, a tone arm carrying a reproducer having playing needle, means for stopping said motor means, a second needle operated by the sound record body for bringing said stoppin means. into operation, a resilient connection between said second needle and the tone arm and a sound deadening material wrapped around the rethereto. by the V silient portion to deaden sound vibrations ture. EDWARD J. TOMLINSON.

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