US1047976A - Sound-recording apparatus. - Google Patents

Description

J. NULL,

SOUND RECORDING APPARATUS. APPLIOATIOK FILED JUNE 21, 1911.

1,047,976. Patentd Dec. 24, 1912.

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: ::g. 1 I I I WITNESSES INVENTOR wr 'Jm%/1 I J. NOLL.

SOUND RECORDING APPARATUS. 7

APPLICATION FILED JUNE 21, 1911.

Patented Dec. 24, 1912.

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)U U; 7 7 I I J 7 ,q/ 26 24' WITNESSES I i i K INVENTOR CW Jaw/m1 WM QR? M UNITED STATES PATENT F I E JOHN norm, or new YORK, n. 2.; essxenoa or ONE-HALF T0 EUGENE DEL MAR, or

, NEW YORK, n. Y.

SOUND-RECORDIN G APPARATUS.

To all whom it may concern:

Be it known that I, JoHNNoLL, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Sound-Recording Apparatus, of which the following is a specification.

vThis invention comprises new means for effecting a talking machine record of speech or sounds and is particularly adapted to the making of records of telephonically transmitted speech. The term talking machine is used broadly, the particular type illusstretched metal band actuated trated herein being that in which the record is made in a circumferential spiral line upon a cylinder, as of wax or other appropriate material. The organization comprises, among other things, a stylus lever operated by vibrations of a medium such' as a electromagnetically in the case of telephonically transmitted sounds, said stylus lever having 'a floating fulcrum through which an adequate gravity stress, capable of adjustment if de sired, may be imposed uponv the recording stylus bearing upon the record receiving surface.

In the accompanying drawings: Figure 1 is an end elevation; Fig. 2, a plan View; Fig. 3, a sect-ion on the line 3, 3, of Fig. 2; Fig. 3* is a detail horizontal section taken slightly above thestretched metal band and through means for holding one end of the same, parts being shown in elevation; Fig. 3 is a side elevation of the postwhich engages the feed-screw; and Fig. 4, a bottom plan view of the recording devlces.

As shown the apparatus comprises an appropriate frame supporting guide rods 1 and parallel therewith'a sleeve 2 within which is mounted to rotate a worm 3- Mounted in bearings in the plates of the frame is a shaft 4 on which turns loosely a power driven pulley 5 carrying' one momber of a clutch 6-the opposite-member 7 of which is splined to the shaft and provided with an ordinary shifting fork 8. The end of the shaft 45 projecting beyond the frame plate 9 carries a cylindrical holder 10 adapted to receive in the usual way the record cylinder 11. On the other end of the shaft there is a pinion 12 which,-through gears 13, 14, transmits motion to a pinion 15 on Specification of Letters 1atent.

Application filed June 21, 1911.

of the floating lever 27 Serial No; 634,522.

the worm shaft. When the clutch is engaged the worm and record holder 10 are simultaneously rotated.

Therecord making part of the apparatus comprises a frame having a dependent portion 16 provided with a bracket 17 embracing and running upon the supporting and gulding rod 1. The upper portion of the frame is horizontally disposed and comprises an iron plate 18 of adequate mass at the side ofwhich" is a sleeve 20 that embraces and travels upon the sleeve 2 within which the Patented Dec. 24, 1912. i

worm 3 is disposed. On the under face of the plate 18 are carried downwardly projecting cores of tially surrounded by apermanent 20* also secured to the under face 18. The function of the permanent is to saturate the electromagnet which vibrates the stretched metal band. If this permanent magnet were not employed, pulsating current, which is created in. the winding of the electromagnet when the circuit is closed by the operation of the transmitter, would not set up a magnetic -fluctu-- ation, but would be diffused in the electromagnet.

of plate magnet] the weak an electromagnet l9, 19,par-

magnet In appropriate-proximity to the poles of the magnet is a soft iron armature 21 carried by a stretched 'metal band 22 of appropriate-material, preferably iron. This band is mounted atone end in a block 23 having a tapped aperture engaged by an adjusting or straining screw. Atthe other end of the band is attached a block 24 engaging downwardly projectingportions 25 of the. frame and having on each side of the .band 22 knife edges 26 that seat in notches 26 in the, outer face of such portions 25. This affords a convenient con:

struction capable ofready control in the way.

of adjustment and manipulation..- Beneath the band 22 is a floating'lever27 rocking at one end on trunnions' 46 and free at the other. In a slot 28' in this lever is pivoted intermediate its ends at 29 the recording stylus lever. :One end of this lever is'connected by a'link' 31 to a centrally-disposed eye pther end is 32 on the band 22,- and in the fixed the recording stylus 30. The free end preferabl has applied to it a. weight 33 that may e removable,,if desired, so that the gravity; stress imposedupon the stylus lever through its pivot may be varied. This weight is shown as a small disk or plate having a stud seating in an aperture in the lever near to its free end. The fixed sleeve 2, within which the worm rotates has in its under face a longitudinal slot 34. The sleeve 20 has a diametric slot to receive a lever 40 that turns on sleeve 2 and rigidly attached to sleeve 20 is a pendant hanger having side arms 36 whose ends are connected by a cross bar 37. This bar is apertured to receive a vertically movable post 38 whose upper end is adapted to engage and cooperate with the worm into engagement with which a spiral spring surrounding the post normally tends to urge it. The upper end of the post is bifurcated so that it may have two teeth or ends to engage the worm. At the base of the bifurcation there is an inclined cam face 39 with which cooperates a cam face 40' formed upon lever 40 that works between the bifurcations of the post.

When the lever arm 40 is moved to the position shown inFig. 3, post 38 is allowed to rise to bring its ends or teeth into engagement with the worm to cause travel of the frame, that carries the recording mechanism, longitudinally of the axis of the record holder 10. When the lever is thrown to the position indicated in Fig. 1, the cam upon its lower end forces downwardly the post '38 thereby arresting movement of the carriage; and, at the same time, the cam face of the lever operates upon a plate 41 pivoted on the inner side of the cross piece 37 moving it inwardly to the position shown in Fig. 1. Near one end of this plate is pivotally connected a rod 42 surrounded by a coil compression spring 43. This rod passes through an apertured block 44 fixed on the frame and engages an arm 45 extending upwardly from the trunnion shaft 46 to which lever 27 is secured. In this way, the lever 27, and with it the recording stylus lever, is elevated to inoperative position. It may be returned to operative position by reaction of the spring 43 when lever arm 40 is moved to the position indicated in Fig. 3. Preferably, a stop 47 'on the side of the rocking plate 41 is provided to limit descent of the floating lever 27 should the apparatus be started without a record cylinder in position. A flange 48 on the sleeve 20 is formed with depressions 49, 49, adapted to be engaged by the rounded end of a spring pressed pin 50 projecting laterally from lever arm 40 and acting to hold that arm in either of its two positions.

With the apparatus in the position indicated in Fig. 3, the weight of the floating lever acting through the stylus carrying lever causes desired pressure of the stylus upon the surface of the record cylinder. The vibrations of the band 22 produce oscillations of the stylus lever about its axis to produce a record upon the cylinder. Contact of the point of thestylus with the surface of the cylinder is re-inforced by the gravity stress of the floating lever, the action being such as.to produce substantially uniform pressure or contact even though the surface of the record cylinder may not be exactly cylindrical, or the record cylinder is not exactly concentric to the axis about which it rotates. Furthermore, the stylus lever in its oscillations is influenced by the inertia of the floating lever and this I have found also to be a factor aiding in the production of perfect results.

Having thus described my invention, I claim 1. An electrically operated sound recording apparatus, comprising a support, an

electromagnet carried thereby, a stretched vibratory metal band adapted to be vibrated by said electromagnet, a permanent magnet disposed in proximity to said electromagnet, and a stylus adapted to be vibrated by said vibratory metal band 2. An electrically operated sound recording apparatus, comprising a support, an electromagnet carriedthereby, a permanent magnet partially surrounding said electromagnet, a stretched vibratory metal band adapted to be vibrated by the electromagnet, and a stylus adapted to be actuated by the vibration of the vibratory metal band.

3. An electrically operated sound recording apparatus, comprising a support, an electromagnet carried thereby, an approximately horse-shoe shaped magnet bar partially surrounding said electromagnet, a

stretched metal vibratory band adapted to be vibrated by said electromagnet, and a stylus adapted to be actuated by the vibration of said vibratory band.

4. An electrically operated sound recording apparatus, comprising a frame, an electromagnet carried thereby, a permanent magnet partially surrounding said electromagnet, a stretched metal band mounted in said frame in proximity to said electromagnet, means to regulate the tension of said band, a floating lever having one end pivoted to said frame, a stylus lever pivotally mountedupon said floating lever, a stylus at one end of said lever, and means connecting the other end of said stylus lever with the metal band.

5. In a sound recording apparatus,'the combination with a supporting structure, of a carriage to move longitudinally of the same, a vibratory stretched metal band supported by the carriage, a lever pivotally connected with said carriage and provided near its pivot point with an upstanding flange, a recording stylus-lever pivotally connected with the first named lever, a worm-shaft to effect the longitudinal movement of the carriage, a reciprocatory shaft provided with catory rod to enga e the ustanding flange of the first named lever, swinging link pivotally connected with one end of the .re-

ciprocatory rod to support the same, a com-' pressible coil spring surrounding the reciprocatory rod to move the same in one direction, and a common lever to move the reciprocatory shaft-andthe swinging 6. In combination, means for supporting and rotating a record cylinder, a carriage traveling in proximity thereto, a permanent magnet supported by the carriage, anelectromagnet disposed within the permanent magnet, a stretched vibratory metal band disposed near the electromagnet to be vibrated thereby, means pivotally connecting one end of said metal band with said metal band disposed near the electromagnet to be vibrated thereby, and means including a stylus to be operated by saidmetal band.

In testimony whereof I afiix my signature in presence of two witnesses. JOHN NOLL. Witnesses:

. EUGENE DEL MAR,

Eow. L. LANGLEY.

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