VOME DELE OF EVITTUATION Improvements in and connected with Graphophones.
Year: 1898

page_text: Date of Application, 30th Dec., 1898-Accepted, 25th Feb., 1899
VOME DELE OF EVITTUATION
Improvements in and connected with Graphophones.
A communication from abroad by THE JOINT STOCK COMPANY, styled "Berliner
Electro-mechanische Werkstatten, Gesellschaft mit Beschrankter Haftung,"
of Berlin, in the Empire of Germany.
I, ALFRED George Brookes, of 55 and 56, Chancery Lane, in the County of
London, Chartered Patent Agent, do hereby declare the nature of this invention
and in what manner the same 18 to be performed, to be particularly described
and ascertained in and by the following statement;―
In graphophones, hitherto, there has frequently been noticed the inconvenience
that, as a result of the absence of any means for positively guiding the "horn,"
sound-trumpet or reverberator, the sound collecting "shell" would slide over the
phonogram cylinder in the axial direction, without following the spiral grooves
cut in the cylinder, and this drawback was observed to arise with particular
frequency where the position of the apparatus was not precisely level.
or
To obviate this defect wherewith all graphophones known until the present
time were attended, endeavours have alieady been made to guide the "hoin"
sound trumpet in a positive manner This it was attempted to effect by means
of leading spindles, worms, or sciews which were arranged to receive rotary
motion through the medium of gear wheels or equivalent mechanism, and with
which the "horn" or trumpet was thrown into engagement
Also, it has heretofore been deemed necessary to use leading screws the length
which was about equal to that of the phonogram cylinder. The gearing required
for these arrangements, whereby motion was transmitted from the operative
mechanism to the saad leading screw, in conjunction with the great length of the
latter, increased the cost of the apparatus, however, to a comparatively high
degree, in addition to which the toothed wheels or the like means employed in
transmitting motion, became the cause of objectionable noises affecting the dis-
tinctness of the notes reproduced by the graphophone.
The defects mentioned above as attaching to the existing arrangements of this
class are removed by the present invention which consists in mounting the lead-
ing screw or worm, adopted as a guide for the "horn" or trumpet, upon the shaft
or spindle of the operating gear direct. Around such leading screw there is
fitted a nut, revolvably supported in a lever, the free end of which engages with
the point of the said "horn" or trumpet
The improved arrangement is illustiated in the accompanying drawings by
two sections taken at right angles to each other
"
In the drawings, a designates the base plate of the apparatus, 6 is the operat-
ing gearing or movement", the phonogram evlinder; d the "horn" or
sound trumpet which reverberates or "throws out" the piece, sounds or tune
(recorded in the graphophone) into space, e is a standard wherein a bent frame
or yoke f, which carries the "horn" or sound trumpet, is evolvably mounted,
9 is a centrifugal regulator, whereby the requisite uniformity of motion of the
gearing or clockwork 18 ensured; h 18 a knob for operating a biake which enables
the speed of rotation of the phonogram cylinder to be controlled

page_text: و
All these parts of the instrument are, in the main, well known What 18
novel and essential to this invention is the arrangement for positively (or
directly) guiding the horn or sound trumpet This consists of a screw or
woim k, formed on the operating spindle, or rather on an extension of the same
and being threaded with but a few spial grooves This woim or screw is fitted
within a nut revolvably supported. at o, in the lever n, which 18 pivotted at m
At the end of this lever n, which is opposite to its pivot-point, there is provided
a stud or pin p engaging in a groove or slot formed for the purpose in the "horn"
or trumpet d
The operation of this mechanism is as follows..
The moment the clockwork b is set in motion, the spindle of such clockwork,
together with the screw k, begins to revolve at a comparatively slow rate of speed,
with the result that the nut gradually moves along the spindle
This lateral displacement of the screw nut upon the said spindle at the same
time involves an oscillation of such nut upon the pivot o in the lever n The
serew nut 7, in its lateral movement, also moves the lever n itself, and though
the said lateral movement of the nut be small, it caules with it a lateral oscil-
latory movement of the pivot p of somewhat considerable amplitude and a colle-
sponding movement of the front end of the "horn 01 sound trumpet d
"
By such means the object of the positive guidance or control of the "horn"
or trumpet is accomplished without the aid of any complicated motion-tians-
mitting contrivance, and the disturbing noise which such a contrivance would
occasion, 18 obviated
"
While the arrangement heieinabove described is mainly intended for guiding
the "horn or sound trumpet of a graphophone, or apparatus for the reproduction
of pieces of music from a given phonogram, yet it is applicable also to the phono-
graphs proper, which are emploved in forming phonograms, or records of notes,
its object in that case being positively and securely to guide the stylus
Having now particularly described and ascertained the nature of the sand in-
vention, and in what manner the same is to be performed, I declare that what I
claim 19
.
1 In a new and improved graphophone with means for positively guiding the
"horn "
or sound-reverberating trumpet by means of a leading screw or worm,
the arrangement of such screw upon the spindle of the operating tiain or move-
iment" of gear wheels, or upon an extension of such spindle, as described and
for the purpose specified
2 In a graphophone with means for positively guiding the hoin" or sound
trumpet, the combination of a leading screw formed upon the spindle of the
operating train of wheels, with a screw nut fitted on to the said screw, which by
means of a pivot-pin is revolvably supported in a lever engaging with the "horn"
or trumpet, as described and for the purpose specified
Dated the 30th day of December 1898