US1399881A - Apparatus or means for automatically stopping gramophones and like machines - Google Patents

Description

J. I. RODWAY.

APPARATUS 0R MEANS FOR AUTOMATICALLY STOPPING GRAMOPHONES AND L IKE MACHINES.

APPLICATION FILED MAR. 18, 1920.

1,399,881; Patented Dec.13,1921.

l NYE N TOR L JOHN I NSHA W RODNEY ms nrroxmy V Joins msrraw RODWAY, or anrroran, ENGLAND,

APPARATUS on EANS ron AUTOMATICALLY STOPPING GRAMOPHONES Ann LIKE MACHINES.

Application filed March 18, 1920. Serial No. 368,910; I

(GRANTED UNDER THE raovrsrous or THE sum or amnes a, 1921,41 srar'r. 1a., 1313.

To all whom it may concern:

Be it known that 1, JOHN INsHAw Ron- WAY, a subject of the King of Great Britain, residing at Lyndhurst, Lime Tree avenue, Retford, Notts, England, have invented a new and useful Apparatus or Means for Automatically Stopping Gramophones and like Machines, (for which I have filed an ap plication in England June 10,.191 l, Patent N 0. 14,002), ofwhich the following is a specification.

This invention relates to improved apparatus or means for automatically stopping gramophones and the like on the completion of a record, of the kind which comprises a brake automatically brought into operation by the movement of the sound arm.

Objects of my invention are simplicity and economy of construction, easy application to existing machines, and absence of any appreciable retarding stress on the sound arm due to its action on the braking means.

In some known constructions the motion of the sound arm operates a catch and releases a brake lever or bolt which is spring urged against the periphery of the turntable or said catch releases a spring urged cam surface which forces abrake stud against said periphery. In another'known construc-. I

tion the motion of the sound arm releases a catch which holds out of action spring operated toggle levers furnished with a brake pad adapted to be applied to the periphery of the turntable. It has also been proposed to cause the motion of the sound arm to move a catch carried by the turntable into position to engage with a fixed stop on the base or cabinet.

Such constructions are more or less complicated, and some of them tend to exercise a retarding stress on the sound arm which is fatal to the proper rendering of a record; furthermorein most cases re-setting of the device is necessary.

According 'to'my' invention, I dispense entirely with all spring braking action and my sound arm operated brake device comprises a freely pivoted lever so constructed and arranged that when the brake shoe or pad which it carries is brought lightly into contact with the periphery of the turntable ports'the record 6.

by the movement of the sound arm the power required for more forcible application of the brake is immediately supplied by the rotating turntable itself as will hereinafter appear. No appreciable. retarding stress is thus placed on the sound arm when it operates the brake. My apparatus is also preferably s0 arranged that the brake is automatically released by the act of returning the sound arm to commence record, and does not require. re-setting. e In the annexed drawings, Figure 1 shows 1n side elevation so much-of an ordinary gramophone to which my invention is applled as is necessary for the proper comprehension of the latter. I

Figs. 2 and 3 are plan views respectively showing the brake in the off and on positlons.

modification.

a indicates the rotating table which sup- 0 is the brake lever or member mounted freely on a vertical pivot d carried by a suitable support e fixed to the box of the gramophone. In the tail of this lever'there is formed the slot which is engaged by the screw pin or engaging member 9 extending downwardly from the arm 72, fixed to the vertical portion of the sound arm 11 by the clip member is. Z is a pad or shoe of'felt, leather, rubber or the like carried by the brake lever and adapted to con-' tact with the periphery of the rotating table a when the lever 0 is moved in one direction.

The brake-lever 0 is so constructed and arranged that radial lines drawn respectively. from the axis of the turntable a and the lever pivot cl to the point of contact between the brake pad Z and the periphery of the turntable will make an obtuse angle. Directly light contact is made, the turntable rotating'clockwise tends to carry around with it the brake pad, which may be considered to act like a' frictional cog, thereby increas- Specification of Letters Patent. Patented DQC'. 13, 1921- y Fig. 4: is a side elevation showing a slight ing this angle and setting up a toggle action which augments the brake pressure quite of the action of the sound on the completion of the record the engaging member 9 carried by the sound arm having now reached the end of the lever arm slot after traveling along the right hand side thereof. In Fi 2 th brake is shown released by the return movement of the sound arm tne engaging member 9 having now traveled outwardly of the slot 7 along the opposite or left hand side thereof. The movement of the brake lever 0 is here shown as limited by the pin m extending upward from said lever and adapted to contact with stops provided by the walls at the ends of the peripheral recess formed in the washer n fixed on the lever pivot (Z.

r In the modified arrangement, Fig. 4:, the engaging member 9 extends from a clip lc secured to the horizontal in lieu of to the vertical portion of the sound arm In the arrangements shown in the drawings it is assumed that the record terminates near the center of the disk. In the case of records which commence near the center and terminate at or near the periphery it is obvious that the apparatus may easily be arranged, as by a simple inversion. of the brake lever, so that the brake will be applied by the outward in lieu of by the inward movement of the sound arm.

It is to be understood that I do not. confine or limit myself to the precise constructions shown whichmay obviously be varied very considerably without in any way departing from my invention. 7

tact with the periphery of the turntable by the movement of the said arm, the arrangement being such that directly the said pad or shoe contacts with the turntable a toggle action is setup by the rotation of the latter, whereby the rotation of said turntable augments the brake pressure independently of the motion of the sound arm.

2. In a gramophone according to claim 1, an engaging member consisting'of a pin or stud carried by the sound arm, and a slot in the brake lever engaged thereby, the arrangement being such that when the sound arm is moved in one direction the engaging member acts upon one side of this slot and applies the brake while when the sound arm is moved in the reverse direction said member acts upon the opposite side or the slot and releases the brake.

In testimony whereof I have signed my name in the presenceof two subscribing witnesses.

JOHN INSHAW Rom var.

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