US1868369A - Sound recording machine - Google Patents

Description

J y 19,1932, J. H. SAILUARD 1,868 369 SOUND RECORDING MACHINE Filed Jan. 19, 1929 MVE/VTOR .11?! 84/1 LIA no Y QAZZW Patented July 19, 1932 UNITED STATES PATENT OFFICE JOHN H. SAILLIARD, OF GREAT KILLS, NEW YORK, ASSIGNOR TO BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK SOUND RECORDING MACHINE Application filed January 19, 1929. Serial No. 333,731.

This invention relates to sound recording machines and its object is to facilitate the pro duction of records with such machines.

The advantage of being able to reproduce a record immediately after recording is well understood in the art. Such a procedure represents the only sure way of determining without great loss of time whether the record being made-is satisfactory. Accordingly, va-

rious devices for reproducing the original soft wax recordshave been proposed. One of these. is disclosed in Patent 1,778,386 to H. C.

Harrison, October 14, 1930 and consists of a desiredto play back a record, or moreoften,

a small portion of a record, which had just been made, it was necessary to remove the recorder from its sup orting saddle and substitute for it a play-hack reproducer. This procedure was found to be objectionable for several reasons. The frequent interchanging of the. translating devices was not only inconvenient but it also involved the loss of the recorder adjustment which had been obtained I by careful experiment It was found also 0 that very. careful adjustment of the' reproducer in its holder was necessary to insure that it was not biased toward one side or the other since any appreciable bias introduced distortion in the reproduction and might damage the record grooves.

In orderto avoid distortion in the record the recorder adjustment referred to above must be such that when the recorder is in cu ting position on the record the cutting face of the stylus is exactly vertical This means that the supporting arm of the recorder must i be accurately located in vertical adjustment in accordance with the thickness'of the record material and the dimensions of the particular recorder used. When once adjusted the recorder can of course be raised from the surface of the record and lowered again without losing the adjustment by rotating the recorder about .its own horizontal axis. But when the recorder is removed from its saddle and the reproducer is inserted for play-back purposes. the vertical adjustment must be changed due to the difference in the dimensions of the two devices and hence the recorder must be readjusted when replaced before the recording can continue.

In accordance with the general features of this invention these objections are overcome by attaching to the arm carrying the recorder holder an additional clamping device for the. play-back. This device is made both rotatably and vertically adjustable with respect to the supporting arm so that the play-back may be used for reproducing allor any portion of a record without disturbing the recorder adjustment. Suflicient freedom in the movement of the reproducr is obtained by providing ball bearing pivots between the reproducer saddle and its supporting member and leveling the reproducer in its saddle by means of the rotary adjustment.

v This invention will be more readily understood from the following detailed description considered in, connection with the accompanying'drawing, in which Fig. 1 is a general vlew of one embodiment showing also certain parts of a disc recording machine;

Fig. 2 is a more detailed view of the playback reproducer clamping device and shows the adjustment between this device and the recorder supporting members; and

Fig. 3 is'an end view of the clamping device of Fig. 2. v

Since the present invention concerns the adjustment of the recording and reproducing devices, only those parts of the recording machine necessary to an understanding of the invention have been shown. Such a machine consists essentially of a turntable for carrying the record discs, driving means for the turntable such as a motor 2 and a carriage 3 for the recording and reproducing devices. The position of these devices with respect to the record 4 may be varied by moving the carriage manually by means of a Patent 1,711,650 to-H. Pfannenstiehl, May 7, 1929. v

- Referring now to thoseparts of the carriage whichrelate particularly to this invention and are shown in Fig. 2, the recorder supporting arm 8 I is attached to the main supporting arm 9 by means of a set screw 10 passmg through a hole in the face-plate .1- 1.

. The reproducer arm 12 is in turn secured to v the set screw 18 which moves the saddle holder 16 about'the rod 17 against the tension of the spring 19. The saddle 20 is pivotally mounted in its holder by means of an axle rod 21 resting in ball bearings 22-22 and an adjustable counterweight 23 is provided to balance part of the weight of the reproducer and-permit variation of the pressure which the needle 24 exerts on the record 4. The saddle-lifting lever 25 is piv'otally mounted on a saddle holder 16 by a machine screw 30 and has an eccentric cam surface 31; which engages a pin 26 in the member 32 projecting upwardly from the saddle 20. In the position shown in Figs. 2 and 3 the lever 25 is in the operating position, that'is to say, the reproducer arm 27 is horizontal and the stylus 24 is in contact with the record groove. As the lever is turned in a clockwisedirection about its pivot 3 0 the' cam surface 31 moves the pin 26 upwardly, thereby raising justmentiof the recorder 28 inasmuch as the level of the arm 9 has-not been changed.

While this invention has been described with reference to a particular embodiment it is intended to limit it'only by the scope of the following claims. I 7 What is claimed, is: 1. In a machine for cnttin and reproducing soundrecords, the com ination with a turntableanda carriage carrying a recording device, of means for reproducing without disturbing the recorder adjustment, a record cut by the recorder compr1sing a reproducer and a mounting therefor, the reproducer being pivotally connectedto the mounting and'the mounting being both rotatably and vertically adjustable with respect to the car 'the arm, a saddle holder. supported by the a reproducer arm on a horizontal axisat right angles to 5 the saddle axis, means for moving the saddle holder about its axis and means for raising the arm independently of the recorder.

.In witness whereof, I hereunto subscribe 18th,d'ay of January, 1929.

my name this JOHN H. SAILLIARD.

the stylus oil the record by rotating the saddle20 in a counter-clockwise direction about its 'be'arings22. In this way-thelever 25 permits the stylus to be raised and lowered as required after the vertical adjustment has been locked by the set screw 15. When it is desired to play back suitable t pe such as that disclosed in Patent 1,778,386 to H. C. Harrison, October 14, 1930, is fitted to a suitable reproducer arm 27, which in turn is placed in'the saddle 20. The reproducer and its supporting mechanism at this time has been raised sufliciently to clear the record surface by means of the screw'14. The set screw 18 is adjusted so that the reproducer 'armrides freely in its saddle without a tendency to bind on either side and the screw .14 is reset with the needle 24 resting on the record 4 and perpendicular to it. The set screw 15 is then tightened tomaintain this adjustment and the needle is then lifted from the record v onlyby the lifting lever 25.

.It is evident then that the stylus 24 may be I brought into contact with any desired portion ofthe record by means. of the crank 5 and that this procedure does not interfere with the ad from the vrecord the reproducer which may be of any

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