US1128171A - Automatic stop for talking-machines. - Google Patents

Description

R. ;0. MAY. I 'AUTo flw STOP, TOR TALKING AOHIN S, APPLICATION FILED mus, 1913. 1 AgfiflLW-l Patented Feb. 9, 1915.

2 sIiBnTs-sHBBT 1.

ATTORN EY nows'rnns. In; LIIM. PMs-human. u. c.

R. 0. MAY. AUTOMATIC STOP FOR TALKING MACHINES.

APPLICATION FILED MAY 5, 1913.

I Patented Feb. 9, 1915.

V 2 SHEETSSHEET 2.

WITNESSES ATTORNEY" RALPH OLIVER MAY,

or SALEM, INDIANA.

- AUTOMATIC STOP FOR TALKING-MACHINES.

' Specification of Letters Patent.

. Patented Feb; 9, 19115.

Application filed May 5, 1913. Serial No. 765,598.

mechanism being practically all below the level of the tablet.

In accordancewith the present invention the record carrying rotatable table is controlled by an electrically operated brake and there is also provided a contact member capable of being properly positioned with respect to the record table by the placing of the latter on "the record table, so that when the terminal portion of the record groove is reached,'an electric circuit is established causing the actuation of the brake and the stopping of the reproduction. \Vith the present invention it is necessary to prepare each tablet with a small-perforation always at a certaindistancefrom the termiao nal portion of the record grooves, and even though the position of this perforation with respect to the axis of rotation be a variant, its'position with reference to the terminal portion of the record grooves is constant.

The invention will be best understood from a consideration of the following detailed description, taken in connection with the accompanying drawings forming a-part of this specification, with the further un-- derstanding that while the drawings show a practical form of the invention, the latter is not confined to any strict conformity with the showing of the drawings, but may be changed and modified so long as such changes and modifications mark no material departure from, the salient features of the invention.

In the drawings :-Figure 1 is a plan view, partly broken away and partly in section, of a record receiving table of a talking machine equipped with the present invcntion. Fig. 2 is a vertical section on a larger scale than-Fig. 1 showing some nearer parts in elevation, with the record holding table and a disk record tablet thereon in diaietric section. Figs. 3 and 4 are more or less diagrammatic views showing portions of the tablets with sound records of different lengths thereon to illustrate the positionmg of the perforation in the tablet. Fig. 0 5 is an elevation of a sound box arranged for use in connection' with the present invention.

Referring to the drawings, there lS-ShOWIl a table 1 mounted upon a spindle 2 and deas signed to receive and support a disk'record tablet indicated at 3, the tablet being omitted from the showing of Fi'gr'lr The parts are assumed to be'mounted upon-aesuitable support usually in the form of a cabinet,

the top portion of which is shown at 4 in Fig. 2 and this cabinet may be constructed-- asis customary 'in the talking machine art. The table l-is provided with a marginal flange 51extending toward the top 4:, which in the normal position of the parts is,down-' ward, it being customary to havethe table 1 horizontal and the spindle 2 upright. There is therefore some l ttle space between the under surface of the table 1 and thetop so of the cabinet, this space\being ample for the location of certain parts to be described. Mounted on the rope is a plate (3 which may also serve as a support foran electromagnet 7. This plate carriesa lever 8 by 5 means of an upright-pivot pin 9, the lever havingnear one end an armature 10. inposition to be acted upon by the core of the electromagnet 7; this core being indicated atll. The armature 10 is mounted. on thego short arm of the lever in the particularstructure shown, while the longer arm extends to within close. relation to the inner face of the flange 5 and thereis provided with some friction material indicated atlQ, 1 this friction material being usually a padof leather or some other substance customarily employed in the talking" mhchine art for braking purposes. In the .path of the shorter arm of the lever is a stop pin 13, eg and this pin carries a spring 14 which may be a leaf spring with its free end in engagement with the lever, so that ordinarily the brake lever 8 isheld with its armature 10 away from the magnet and its table engaging end 12 out of contact with the inner wall of the flange 5, but near enough thereto so that on the energization ofthe m'agnet 7 and the rocking of the lever 8 by the action. of the core 11 on the armature 10,

the pad 12 is brought into engagement with the inner face of the rim of the table and serves to stop its rotation, this action being augmented by the cam relation of the end 12 of the lever 8 with respect to the inner face of the table 1 and the pin 9, for the distance between the pin 9 and the inner face of the table 1 on a' radial line is less than the length of the longer arm of the.

- being in the form of an eye which fits snugly on the spindle and yet may be moved about the same on the application of archtively small force. The arm ltl'at the free end is connected by a pivot 20 to one end of another arm 21, which at the other" end is provided with a pin 22 of a length to rise above the top of the table 1 and to project through a perforation 23 in the tablet 3, the pin 22 rising for anappropriate distance .above the upper face of the tablet 3 when lodged on the table 1 for a purpose to be described.

lhe tablets 3 of the disk type as used on talking machines have the sound record in the form of grooves 24 on one or both faces, and these grooves are really a continuous spiral groove from near the outer margin of from the center of the record tablet to a point near the central portion of the tablet, which is customarily depressed, as indicated at 25, and there carries the usual label. The record groove begins at approximately the same distance from the outer margin of the tablet'm all record tablets, but because of different lengths of compositions recorded the inner margins may terminate at various distances from the depressed portion For reasons which will presently appear the perforation 23 should be at substantially the same distance from the inner edge of the surface covered by the record groove 21, so that this perforation may be at different distances the tablet and two such positions are shown in Figs. 3 and 1.

In Figs. 2 and 5there is shown a'sound box 26 without any attempt to illustrate any particular construction of sound box, so that the showing may be taken as typical of any of the various sound boxes employed in disk talking machines. The sound box is provided with a needle arm 27 terminating in the usual socket portion 28 carrying a thumb screw 29 designed to clamp a reproducing stylus 30 in place, these features all being common to various types of sound boxes. The socket portion 28 has a contact finger 31 fast thereto, this contact finger being of any suitable type, say, in the form of a fiat piece of metal which may even be a light spring finger, its-purpose being to engage the pin 22 when the stylus 30 has reached the tcrmi nal portion of the record groove, it being customary to provide two or three blank turns of the groove at the end of the por tion of the groove representing sound waves, so that the location of the perforation 23 for the pin 22 may be at a little less than the length of the contact finger or spring 31 from the groove zone to cause contact of these-parts after the sound record containing portion of the grooves has been completed.

'lhe sound box 26 is connected to a conductor 32which may be carried to a battery 3 or other suitable source of current, a

single cell of dry battery being usuallysul'li- 'the eiectromagnet 17, while the other side of this electromagnet is connected by a conductor 35 to the pin or screw 15.

To reproduce a sound record, the record tablet is placed upon the table 1 so that the pin 22 will pass through the perforation 2:1, and because of the pivotal connection between the members 19 and 21 of the arm carrying the pin 22 the usual center hole of the record tablet is easily placed so as to be traversed by the arbor 2 where it projects above the table 1. The stylus 30 is now placed at the proper position to begin reproducing the record and since the circuit charged by the battery is'broken, the magnet 7 is not energized and consequently the spring 11 forces the brake lever 8 out of engagement with the table 1. '1 he record is reproduced in the usual way until finally the terminal portion of the record is reached, when the needle arm 27 to the socket member 26,

thence by way of the finger 31 to the pin 22, thence by way of the arms 21 and lllto the arbor 2, thence by the brush 16 to the screw or pin 15, thence by way of the conductor 35 to the electromagnet 7 and back to the battery 38 by way of the conductor The magnet 7 is at once charged and causes a movement of the lever 8 by thenttractiou of the core 11 for the armature 10 and the end 12 of the brake lever 8 is carried (into engagement. with the inner wall of the marginal flange of the table 1, while the continued rotation of the table 1 underits momentum will bring the brake lever 8 into firm engagement with the table, thereby arresting its movement. By making the finger 31 in the form of a light spring it may snap past the pin 22 but the time of contact and pull the brake lever 8 into engagement With the table, of the table only serves to more firmly engage the brake leverovith' it to arrest the movement of the table.

IVhen talking machines are equipped With.

the present invention it is an easy matter to lay out and bore small holes through tablets already in existence,- and it is likewise an easy matter to provide for the production of the holes 23 in new record tablets as they are manufactured, since a pin properly located in the matrix from which the record is pressed will produce the hole, or the manufacturer may cause the hole to be bored in the finished record at the proper distance from the inner margin of the zone occupied by the sound record groove. The brake is very readily disengaged from binding action with the table 'by a. slight reverse movement of the latter, the spring 1% then returning the brake lever. to its normal inactiveposition, so that the machine is ready for the reproduction of another record It is quite feasible, therefore, that the brake lever S supplant the ordinary stopping brake either actually or in function.

Since the pin 22 and the arms 19 and 21 rotate with the table 1 they may be in almost anypos'ition about the spindle 2With respect to the operator of the machine, and it would therefore be difficult to so place the tablet 3 that the perforation 23 would readilyv coincide with the pin 22 when the tablet is placed upon the table 1. This difficulty is overcome by the fact that the pin 22 may be moved to any desired position about thespindle 2 with respect to the operpositions of the perforations 23 in different record tablets. lvforeover, the carrier for the pin 22 if mounted wholly on top of the table 1 is very readily moved from one position' to another and so far as the table is concerned has universal movement in the plane of the table top.

What is claimed is 1. In a sound reproducing machine, a rotatable table with a depressed central portion, a member movable across the table,an electroanagnetically operated brake for the table. and a circuit controller for the brake comprising a contact member carried. by the table within the depressed portion and ha ving a part rising therefrom above the plane of the top of the table, and another contact and any further movement mounted on the table in the vmember carried by the member movable across the table and arranged to engage the first-named contact member atone limit-of travel of said secondcontact member.

2. In a sound reproducingmachine, a rotatable table, a brake for the table,'electromagnetic means for operating the brake, a

contact, a flexible support therefor mounted directly onv the rotatable table and constructed for universal movement parallel with the table, a member movable over the table transversely thereof, and another contact member carried by the last-named memher and movable therewith into and out of V engagement with the first-named contact.

3. In a sound reproducing machine, a rotatable table, a brake located beneath the table in position to engage the latter,electromagnetic means for operating the brake, a contact pin a-nd niounting therefor carried Wholly and directly by the table on top of the latter-and constructed to move in all directions parallel with the table, said contact pin being electrically connected to the electrdmagnetic brake operating means, a member movable across the table abovethe same, a' contact carried by the last-named member, and electric connections between the last-named contact member and the brake operating means. i

at. The combination of a rotatable memher having a centrally located depressed portion, a supporting spindle for the rotatable member-projecting above the same, a brake lever located below the rotatable member in position to engage the marginal portion thereof and having-a normal tendency toward the inactive position, an electro-magnet for moving the brake lever to the active position and having connections on one side to the spindle, a flexible arm carried by the -spindle and in electrical connection with the spindle above the rctatable member Within the depressed portion and having at the end remote from the spindle an upstanding pin of a height to extend above the surface of the rotatable member, another member movable over the rotatable member transversely thereof, an electric contact carried by the transversely movable member, and electric connections from the last-named contact to the electro-magnet'j for causing the energization of the lectro-magnet on the engagement of the said contact with the said pin.

5. In a sound reproducing machine. a sub stantially flat rotatable table having a central depressed portion, a contact member depressed portion thereof andconstructed to move in all directions therein and \having a' portion of a-lepgth to extend above the surface of the table, another contact mounted for movement across the table into position to en gage the first-named contact, and an electremagnetic brake controlled by the contacts.

(Lg-In a sound reproducing machine, a substantially flat table mounted fol-rotation uponta substantially upright axis and pro.- Vided with a centrallyv disposed depressed portion in 'its upper face, a brake ar rangedv'in operative relation to the table,

electro-magnetic means for operating the brake,- a jointed arm mounted on the table in the depressed portion and movable about the axisof 'said table, a pin carried by the of the jointed arm remote from the axis of the table, and a, contact movable over the table into position to engage the pin, the said movable contact and pin being electrically connected to the electromagnetic brake operating means.

In testimony, that I claim the foregomg as my own, I have hereto afiixed my signa-

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