US1856344A - Sound recording and reproducing apparatus - Google Patents

Description

,May 3; 1932; O.LEOPOLD 1,356,344

- SOUND RECORDING AND REPRODUCING APPARATUS Filed April 4, 1951 2 Sheets-Sheet 1 I m N JA W May 3, 1932.

o. LEOPOLD SOUND RECORDING AND REPRODUCING APPARATUS 2 Sheets-Sheeib 2 Filed April 4, 1951 Patented May 3,

UNITED STATES PATENT orrl'cs OTTO LEOPOLD, OF WEBN'IG'EBODE, HABZ, GERMANY 8 m RECORDING- AND BEPBODUCING AFPABATUS Application filed-April 4, 1931, Serial No. 527,716, and in Germany April 8, 1980.

This invention relates to a sound recording and reproducing apparatus, in which the sound conductor is dad in straight direction so that thetalkmg range of the records is considerably increased .as compared with the hitherto used tone arms oscillating in an arc. Moreover portions of the records can be listened to, so that the stylus can be lifted oil the record and then again placed in the same tone oove, from which it has been removed. inc foils, metal foils, celluloid foils and the like are employed for recording the sound, the st lus standing perpendicularly to the foiL. f it is desired to listen to 16 records of a difierent kind, the tone conductor is accordingly shifted back with the parts connected thereto, in order to enable the inclined adjustment of the stylus in the manner customa therefor.

An em odiment of the invention is illustrated by way of example in the accompanyin drawings in which:

1 shows an apparatus in top plan view.

Fig. 2 is a front elevation of the apparatus. 86 t Fig. 3 shows a roller guide in side eleva- Fig. 4 is a side view of the a paratus. Fig. 5 is a side view of the device for lifting the stylus oil? the record. g to Fig. 6 illustrates a detail.

A movable tone-arm 2 shifts backwards and forwards in a stationa tone conductor 1. On this arm a short inc ined tone-arm 3 s fitted, which carries a sound box 4, which in the case of self recording and reproducing of sounds stands. perpendicularly above the lmagmary line Gextending through the centre of the turn table 5,.(Fig. 1) and is guided straight in the direction of this line. .The shifting of the movable tone-arm 2 in the tone conductor 1 is effected by rollers 7 and 8, the roller 8, on which'the tone arm 2 rests, being constructed as shown in Fig. -3. .The -rollers'7 and.8 are mounted in points 9 so that they turn easily.

The rollers 7, 8 are carried by bows 10, 10' the inner how 10 being fixed on the tone conductor 1, whereas the outer bow 10' is fixed on an angle iron 11 fixed by screws to a slot guide 12. A similar slot guide 12 is pro vided for the vertical supporting arm 13 of the tone arm (Figs. 1 and 2). The bows 10 and 10 form the bearings for ascrew spindle 14, which is driven from a clockwork, electric motor or the like by bevel wheels 31 and 32. The spindle transmission is 1: 2, that is thespindle rotates once, whilst in the same period of time the record rotates twice on the turn table 5. l

A sleeve-sha ed ring 15 is fixed on the tone arm 2 and a olt, 16 extends therethrough (Fig. 5), an adjusting nut 17 being screwed on the upper end of this bolt and an eccentric 18 mounted on the lower end of the bolt and bearin against a half nut 19 (Fig. by a b ade s ring 20 (Fig. 5) to t e ring 15. When it is esired to record, the eccentric 18 must be so adjusted that the screw threads of the half nut 19 engage in the screw threads of the spindle 14. The spindle then guides the vertlcal diamond stylus 21 (Fig. 4) of the sound box 4 on the plate so that the stylus can cut closely juxtaposed spiral grooves into this plate. During the re reduction the half nut is lifted off the spind e (Fig.5)

' Behind the upper guide rollers 7 a shaft y 23 is journaled in two brackets 22, a-hand lever 24 being fixed to one end of said shaft. On short arms 25,extending from the shaft23 a sleeve 26 is mounted which during the soun reproduction assumes the position indicated in Fig. 4, bearing on a rearwardly projectin arm 27 of the sleeve 15. When it is desire to hear a record portion wise, the lever 24 is lowered in the direction of the arrow shown in Fig. 4, the sleeve 15 thereby movin downwards the arm 27 so that the sound ox 4 is raised to enable the stylus to disengage from the spirals of the record, which continues to rotate. If the lever is returned into the posi- 9| tion shown in Fig. 4, the stylus engages exactly at the point at which it was removed. In order to prevent an automatic lifting of the sound box, a lockin disc 28 is mounted on the shaft '23 with which in the locking position a v5 resilient awl 29 engages (Fig. 4) which bgars or; t e locking disc in the raised position i 5 1 The new device can be employed also for the reproduction of all kinds of records,

which have not been recorded by the owner of the apparatus. conductor must be shifted 15 mms. towards In this instance the tone the rear with the parts connected thereto, so that the stylus of the sound box can be set at an incline in the usual manner, whereas in the case of self recording and reproduction the stylus stands'perpendicular. In both instances the line along which the stylus travels must pass through the centre of the record. In order to effect the shifting the fixing screws are loosened, with which the parts 11 and 13 are fixed on the carriage guides 12, 12", and the parts 11 and 13 are then shifted 15 mms. so, that the screw holes 30 (Figs. 1 I

and 4) are utilized as fixing points. I "Icla'im: i

1'. In a sound recording andrep'roducing apparatus the combination composed of a stationary tone conductor and a movable tone arm'forming together a tone guide, said tone arm shiftable in straight direction in said tone conductor, an inclined tone arm connected to said movable tone arm,- a sound box carried by said inclined tone arm, rollers mounted in points adapted to guide said movable tone arm, a'sleeve fixed on said movable tone arm, a bolt extending through said sleeve and said movable tone arm, an adjusting disc on the upper end of said bolt, an eccentric on the lower end of said bolt, a half nut bearing a ainst said eccentric, Ia

blade spring connectmg said half nut to said sleeve, and a screw spindle controlling said sound box adapted to engage said half nut during the recording.

2. A sound recording apparatus, comprising in combination a tone guide, a movable 'tone arm of said guide, a shaft behind and above said movable tone arm, a ring-shaped sleeve carried by said arm, a sleeve on said movable tone arm, a rearwardly projecting arm of said ring-shaped sleeve adapted to support said sleeve on said shaft, a hand lever on said shaft adapted to rotate said sleeve for lifting the stylus oil the record, a screw spindle, a half nut resiliently connected to said ring-shaped sleeve adapted to engage said screw spindle and to be disengaged by said lever, when a record has to be played portion wise, carriage guides, a bracket carrying said tone guide shiftable in one of said carriage guldes, and a bracket carrying said movable tone arm, said shaft and said screw spindle adapted to be shifted back and fixed in the second of said carriage guides for reproducng records.

In testimony whereof I aflix my signature.

OTTO LEOPQLD.

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