US876350A - Graphophone. - Google Patents

Description

gmnntoz PATENTED JAN. V14, 1908.

D. HIGHAM;

v v GRAPHOPHONB. APPLICATION FILED APR.16. 1906.

2 SHEETS-SHEET 2.

. the force of the sonorous vibrations.

DANIEL HIGHAM, OF BRIDGEPORT, CONNECTICUT.

GRAPHOPHONE Specification o1" Letters Patent.

smeared Jan 14, 1908.

Application filed April 16, 1906. Serial No. 312.020

To all whom it may concern:

-Be it known that I, DANIEL HIGHAMf-of I said. As thus far described, the mechanism Bridgeport, Connecticut, have invented a new and useful Improvement in Graphophones, which invention is fully set forth in the following specification.

This invention relates to phonicapparatus wherein frictional means are used to amplify A aratus of this character are described in nijy atents` No. 678,566 of July 16, 1901, and No. '783,750 of February 28, 1905.

The object of the present invention is to simplify and improve the construction and operation of the apparatus of the general c iaracter specified above.

The main improvement effected by the .present invention consists in dispensing with the floating weight heretofore em loyed to keep the stylusin contact with tfie soundrecord with yielding pressure, and'in so constructing and arranging the styluslever that the swinging shaft serves both to press the friction wheel against the friction shoe by gravity and also to press the stylus against the soi d-record by gravity.

The accompanying drawings illustrate the referred manner of carrying out the present invention:

Figure 1 is a vertical section through the center of the diaphragm; Fig. 2 is a similar view showingthe stylusraised'out of contact with thelsound-record; Fig.- 3 is a bottom plan view of the friction devices; Figs. 4 and 5* are'detail views of said friction devices,v

Fig.l 4 being a perspective view, and Fig. 5 a view looking downwards in the direction of the line- 5 5 Fig. 1.

The construction illustrated in the drawings is in its general feature that now in-use. Diaphragm 6 is mounted on carriage 7 mounted to slide as usual on tube 8, within which is the feed-screw 9. Friction-wheel 10 is carried by the sliding telescopic shaft 11, of usual construction, which rotates in the direction of arrow Fig. 1. This shaft is sup- .ported at one end in bearing 12 in the frame,

and at the other in a swinging arm 14, p1v` oted at 15 to an arm 16 which 1s fixed to carriage 7. At the end of shaft 11 is a weight 17. The friction shoel18 is attached by a link 19 to the diaphragm 6, and is in contact with friction-wheel 10, the normal pressure of the friction devices being thus automatically regulated and adjusted in the manner does not differ materially from the Construcw tion now in common use.

The reproducing point or stylus 20 is car'- j described in my Patent No. 783,750-, aforel styllis is not carried by a fioating weight but by an arm rigidly attached to the carriage. The stylussupport as a whole, consisting of theparts 21 and 23, has two joints, 22 and 24, the axes of which are relatively so dis'- posed that the stylus can be moved (turning on pivot 22) towardsand from' the soundrecord 30, and can have also a lateral moves ment (on pivot`24) to compensate for irregularities in the sound-rroove.

The machine is provided with the usual lifting lever 31, which serves to engage and disengage the carriage with the feed-screw in the well-known manner. lThis lever is provided with the usual projection or lug 32, for disengaging the stylus from the soundfrecord. Swinging arm 14 which carries the movable bearing of shaft 11 has a finger 33 extending downwards into the path of lug 32. Fig. 1 shows the parts in their operative position. l/Vhen lifting lever 81 is depressed, as shown in Fig. 2, contact of lug 32 with finger 33 raises arm 14 and shaft 11. T his movement Vturns lever 21 on itsl pivot 22 and disengages the stylus from the sound-record. When the arts are in their operative position, the sty us is hold against the record by the yielding` pressure of swinging shaft 11 and its weight 17.

' It is important that the swiveled block 23, to which the lever 21 is pivoted, should have an elongated bearing, and should have appreciable inertia. lf the lever were siniply pivoted on a narrow bearing to swing laterally, it would not accurately track the record. The inertia of the'block is sufficient to prevent thi-r lever 21 from being readily thrown aside* In order that the lever 21 may pull'itself toa central position when the stylus is lowered onto the smooth partof the record, the line 5-5 of the axis 'fof the .tilting block 23 issuch that it passes close to the point 20 at which link 27 is attached to lever 21.

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