US1588978A - Automatic stop device for sound-reproducing apparatus - Google Patents

Description

June 15 1926.

J. C. M PHAIL AUTOMATIC STOP DEVICE FOR SOUND REPRODUCING APPARATUS 4 Sheets-Shut 1 Filed June 17. 1924 June 15 1926.

J. c. M PHAIL AUTOMATIC STOP DEVICE! FOR SOUND REPRODUCING APPARATUS Filed June 17 1924 June 15 1926.-

J. C. M PHAIL AUTOMATIC STOP DEVICE FOR SOUND REPRODUCING APPARATUS Filed June 17 1924 4 Sheets-Sheet 3 June 15 1926. I J. C. M PHAIL AUTOMATIC STOP DEVICE FOR SOUND REPRODUCING APPARATIJS Filed June 17, 1924.

4 Sheets-Sheet 4 K14. (AKA Patented June 15, i926.

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JOHN C. IVIGPHAIL, OF SOUTH. \VEYMDUTE, MASlSAQE'USETTS, ASSIGNOB, TO FRANK H. THAYER, OF BGSTO'N,

MASSAGE-3i USETTS.

AUTOMATIC STOP DEVICE FGR SGUWD-REPEODUQING APPARATUS.

Application filed June 17,

This invention relates to automatic starting and stopping mechanism for sound reproducing apparatus. principal object of the invention is to provide an effective and reliable automatic inechanisin for controlling the movement of the motor that operates the turn table which bears the record, such mechanism in the preferred and more comprehensive embodiment of the invention embodying devices and connections whereby the stopping and starting of the motor is controlled jointly and .co-operatively by the lROX GDIGIlbOf the tone arm, which bears the reproducing stylus; and the'record as it is placed upon the turntable. The foregoing and other objects and advantages of the invention will more full appear from the following detailed description taken in connection with the accompanying drawings, and the distinctive features of novelty will be pointed out in the appended claims.

llefeii'ing to the drawings:

Fi 1 is a side elevation showing the essential features of the invention with portions broken away, and with a part of the housing support in vertical section;

Fig. 2 is it partial horizontal section on line 2-2 of Fig. 1;

Fig. 3 is a partial vertical section on line 3--3 of Fig. 1;

l ig. l is a fragmentary plan view of a pawl device Associated with the stop mechanism;

5 is a partial plan view on a relati ely smaller scale;

6 is a partial side elevation correto Fig. 5;

. is central vertical section of the table with portions broken away;

8 is a plan view of a record lifting a a member disposed centrally of the turn table;

H is a partial plan View of certain opera-ting connections and mounting therefor located under the turntable;

10 is partial end view of the motor connections and brake therefor, this being 11 view loot g from the left in Fig. 9; and

11 is a partial plan view showing niore particularly the brake operative on the turn table, and the parts associated herewith.

To enable the co-operative relation of the several features to be most readily understood the severel parts will be described sub stantially in the. order in which they come 1824. Serial No. 720,528.

into action in the operation of playing a record.

1 indicates a tone arm of a sound reproducing apparatus bearing a sound box 2 equipped wi h a stylus 3. The inner end of the tone arm is mounted on pivots t to swing vertically, these pivots being borne by a swivel ring 5 fitted to turn horizontally in a base ring 6 mounted upon a board or plate 7 at the top of the housing or cabinet. All these parts may be generally of usual or standard construction. 8 indicates the turn table which bears the record, this table having, as usual, a conical socket 8 which fits I upon a conical end portion 9 of a shaft or arbor 9, which has operating connections from a suitable spring motor 10 or other priine inotive means. In accordance with r v invention the turn table 8 has a central dished portion 8 adapted to receive a disc plutoor ring 11. This plate 11 is mounted on short studs 12, shown as three in numher which extend up slidably through the turn table and are borne at their lowerends by a plate 13 beneath the turn table. Thus mounted the plate 11 is normally held lightly a small distance above the surface ofthe turntable 8 and adapted to be pressed down into the dished portion 8 by the weigl'it of a record as it is rested thereon this resulting in releasing brake device applied to the motor now to be described. The plate 18 is engaged from underneath by spaced apart rolls 1 f borne by a forked end portion 15 of a lever bar 15. The lever 15 is provided intermediate its length with a lateral downwardly extending lug 15 which is pivoted st 16 to the fJJZUHB'VGYlL The lever extends outwarc from. this pivotwith a counter weight 17 adjustably flXGtl to its outer end portion, this counter weight being adapted to hold the plate 11 lightly in its upper position in readiness to be engaged and pressed down by a record. lhe lever 15 also has intermediate its length an upwardly extending lug 18, with which is engaged one end of a rod 19, the other end of which is connected with an arm 20 on a vertically inounted rockshaft 21. The rockshaft 21 bears at its lower end a strap or plate 22 bearing a brake surface 22 at its outer end adapted to be pressed upon a brake disc 23, which is fixed on a shaft 24 of the motor gear train, this shaft having the usual centrifugal speed governor 25 mounted thereon. The speed governor controls the disc 23 causing it to press more or le s against the braking surface 26, this hour "constituting no part of the invention. it may now be understood that as a record is placed upon the turn table, the neight thereof will press down the plate or ri e ll and through the described connections will cause the rod 19 to rock the shaft to release the brake 22 and permit the motor to start.

For automatically stopping the turn table as the playing of a record is finished, each record is provided at a predetermined location inward of the grooved area thereof with a small ridge or projection 27 Thls projection is so located that as the record is finished it engages a small pin or stud 28 adiustablv borne at the end of a curving arin 29. the inner end of which is fixed to one end of the shaft 30. This shaft 30 1s fitted to turn in a tubular member 31 extending underneath the tone arm and borne in lugs: 32 extendingtherefrom. For purposes of the present description, this tubular member 31. and the lugs 32 may be considered merely as a journal bearing for the shaft 30 which rocks therein. The shaft 30 has fixed at its inner end a curving arm 33 and this arm 33 has pivoted at its outer end, a series of stepped pawls 34. These pawlg 34: are adapted when the arm 33 is swung downward by the rocking of the shaft? to engage a ratchet face formed on the top of a plate portion 35 borne at one end of a bent arm 35. The purpose of having a plurality, shown as four of these stepped pawls is so that one of them will always he in position to engage instantly the ratchet face of the plate 35 upon the contacting of the record projection 27 with the stud 28. The arm 35 is pivoted inter mediate its length at 36 to a curving arm 37 of a bent lever member 37. The lever member 37 is provided with downwardly eX- tending lugs 37. which are pivoted on a pin 38 fitted in the base ring 6. The lever 37 bears at its outer extremity a brake pad 39 adapted to engage the under side of the turn table 8 to stop the same when it is permitted such engagement. The lever 37 bears a leaf spring 40 which reacts against a fixed abutment to normally press the braking pad 39 against the turn table. The arm 35 bears a tail portion 35' which extends underneath the lever portion 37 and is adapted to engage the top of a short stud 41. which projects upward from the base ring 6 and when thus engaging over the top of said stud. is adapted to hold the brake pad 39 away from the turn table. A leaf spring 42 is mounted to act upon this tail portion 35 tending constantly to move it over the stud 41 when it is elevated enough to clear the top of said stud. A conical stud -13 is borne by the arm 37 in position to encaagc a beveled outer edge surface of the ratchet plate 35 whereby as said ratchet plate is pressed downward the arm 35 will be rocked on its pivot 36 to dislodge the tail portion 35 from the top of the stud 41. It may now be understood that as the playing of a record is finished the ridge or projection 27 engaging the stud 28 will rock the shaft 30 causing one or the other of the pawls 341 to engage the ratchet plate and press the same downward. As this occurs the outer beveled edge of said plate ongaging the conical pin 43 operates to swing the arm 35 on its pivot 36 to remove the tail portion 35 from the top of the stud ll and permit the arm 37 to be moved upward so as to press the brake pad 39 against the turn table under the action of the spring 40, to stop the same. In accordance with my invention means is provided whereby the tone arm is swung outward preliminary to playing another record, the braking device iust described is reset in readiness for another operation, i. e. the brake pat 39 is moved away from the turn table and the tail piece 35 relocated on top of the stud 4-1.-and by the same movement the brake 22 is re-applied to the disc 23. and the plate 11 again raised to the position shown in Figure 7 in readiness to receive another record. For this purpose the extremity of the bent lever arm 37 is provided with an inwardly extending inclined ledge 44: which is operatively engaged by a co-operative ledge 45 extending outwardly from the end of a curving ar1n4t6 which is pivoted at 47 to the. inner portion of the tone arm. The ledge 4-5 presents upper and lower convex faces with thin side edges at front and rean and the arm 4.6 is equipped with a leaf spring 48 bent to press the same upward. lVith this arrangement the ledge 4:5 will engage underneath the ledge 44 to lift the arm 37 and reset the brake pad 39 awav from the turn table, as the tone arm is swung outward. but as the tone arm moves inward. in the playing of the record. the ledge 4-53 will slip up over and behind the ledge 44- without operating impulse thereon, the arm 36 for this purpose swinging on its pivot 47. The arm 4-6 is provided intermediate its length with a lateral cam face 49, and this is adapted to engage a roller 50 borne by a short arm 51 secured at the upper end of a shaft 52- journalled in the base 6. This shaft 52 has fixed at its lower end an arm 53, the outer end of which is connected with one end. of a rod 54. the other end of which is engaged at with the lug 18 of the lever 15. With this arrangement as the tone arm is swung outward after a record is finished and preliminary to starting another, the first action is that the cam ledge 45, engaging the ledge 44, moves the brake pad lit 39 away from the turn table and resets this brake device, and immediately thereafter by the continuing swinging movement of the arm, the cam face l9 engaging the roll 50 operates to reapply the brake pad 2% to the brake disc 23 and simultaneously lifts the plate 11 in readiness to receive another record, thus completing the cycle of operaticns. The ring base 6 is provided with a cam ledge 56, upon which the tail and pivot portions of the arm 46 are adapted to ride as the tone arm is swung fully outward, this raising up the tone arm and holding it elevated until it is moved inward to starting position on the record, which clears this cam ledge, and permits the tone'arm to be lowcred.

The. sequence or operations having been set forth in connection with the several operative "features as described, will not be further repeated. It will be noted that by the co-operative relation of the two braking devices set forth the turn table with its motive connections is stopped by the brake 39 as a record is finished, and as the tone arm is again swung outward, as soon as the bral: 39 is released and reset as described, the motive connections are brought under the control of the brake 22 operative on the disc 23, which is brought into action as described by the engagement of the cam face 4-9 with the roll 50, and the turn table is thus held stationary until the bralre 22 is released by the pressing down of the plate 11 under the weight of the record to be played as it is deposited on the turn table. I am aware that the invention may be embodied in other specific iorms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope or" the invention.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

l. The combination with the tone arm and turn table of a sound reproducing apparatus, of a brake device having connections to be rendered inoperative by the weight ot a record deposited on said turn table, a second brake device equipped with connections under the control 01" the tone arm to be rendered operative thereby as the playing of a record is completed, means for resetting said second brake device as the tone arm is swung outward, and means for restoring said first brake device to operative position by such outward swinging of the tone arm.

2. The combination with a turn table equip i ed with motive connections and swingin tone arm of a sound re iroducin a" nae l P record deposited on the turn table, a second brake device equipped with connections for rendering the same operative as the record is finished, said connections including a device arranged to be rendered operative by an abutment on the record, means for resetting and disabling said second brake device as the tone arm is swung outward, and means for reapplying the first named brake device by such outward turning of the tone arm.

8. The combination with a turn table of a sound reproducing machine, motive connections therefor equipped with a brake, said turn table having a central dished portion. and a plate normally held over said dished portion equipped with connections for disengaging said bralre as it is depressed by the weight of a record resting. on said turn table.

4. The combination with a turn table equipped with motive connections and a swinging tone arm. of a brake operative on the turn table, and means for rendering; said brake operative as the playing of a record finished, said means embodying connections borne by the tone arm and equipped at the outer portion thereof with a member engageable with an abutment 0r detent on the record.

5. The combination with a turn table quipped with motive connections and a swinging tone arm, of a brake operative on the turn table, means for rendering said brake operative as the playing of record is finished, said means embodying connections borne by the tone arm and equipped at the outer portion thereof with a member engageable with an abutment or detent on the record. and means for resetting said brake to render the same inoperative by the swinginp; outward of the tone arm.

6. The combination with a turn table equipped with motive connections and a swinging; tone arm, of a brake operative on the turn table, means for rendering said brare operative the playing of a recon is finished, said means embodying connections borne by the tone arm and equipped at the outer portion thereof with a member engageable with an abutment or detent on the record. means for resetting said brake to render the same inoperative by the swinging' outward of the tone arm, and a second brake equipped with means for rendering the same automatically operative by the swinging outward of the tone arm.

In testimony whereof, I have signed my name to this specification.

JOHN C. MolHalAIL.

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