Music-disc Driving Mechanism for Mechanical Musical Instruments.
Year: 1898

page_text: Date of Application, 5th Nov., 1898-Accepted, 23rd Dec., 1898
COMPLETE SPECIFICATION.
Music-disc Driving Mechanism for Mechanical Musical Instruments.
I, MAX LOCHMANN, of 17, Langestrasse, Gohlis, near Leipzig, Germany,
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement;-
For music-discs furnished with transmission holes or teeth, driving wheels are
requisite, which, as they work against a thin steel plate come into engagement at
one time above, and at another time, below their pitch circle, and, therefore, first
push the music-disc to an extent somewhat more and then somewhat less, than
the pitch. In order to ensure the exact pushing forward according to the pitch,
I provide the musical-discs with transmission studs or bosses which engage with
corresponding recesses or indentations in a cylinder, whilst the music-disc is
forced by guiding wheels to lie on the periphery of the cylinder.
Figs. 1 and 2 illustrate, by way of example portions of two such improved
driving arrangements. Figs. 3 and 4 shew partly in section portions of the
transmission cylinder; Figs. 5, 6, 7, and 8 represent music-discs with different
kinds of transmission studs or embossings.
The transmission cylinder W is furnished on its periphery with holes or indents
in which the studs or projections of the music-disc N engage. The wheels R¹
and R2 of the music-disc holder (see Fig. 1) ensure the music-disc N being kept
in close contact with the periphery of the cylinder W.
In the form of the invention shewn in Fig. 2, the transmission cylinder W is
furnished with recesses, or indentations on its periphery corresponding with the
studs or projections of the music-discs. The recesses or indentations are either
sunk in, cut in or cut through the width or substance of the cylinder.
By means of side plates or flanges as shewn in the figure, a shifting of the
music-disc is avoided. Instead of the wheels R R2 which press the music
disc N against the periphery of the cylinder, a cylinder R can be employed above
the music-disc.
Fig. 3 represents a transmission cylinder with openings corresponding to
Fig. 1; Fig. 4 a cylinder of the same kind with recesses, or indentations,
corresponding to Figure 2.
Fig. 5 shews a music-disc with round transmission studs or projections;
Fig. 6 one with studs of increased length radially, and Fig. 7 a music-disc with
inclined or obliquely set transmission studs or projections.
Fig. 8 finally represents an arrangement of several rows of transmission studs
or embossments, in which one such stud or projection stands next to two such
studs or projections, so that a continuous engagement is assured. Two rows of
studs or projections arranged so that one stud or projection will always lie
between two, in the row above, or below, could equally well be employed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. Driving annaratus for mechanical musical instmiments the distinguishing

page_text: feature of which is that the studs or projections B engage in corresponding
recesses or indentations of a transmission cylinder W, whilst the music-disc is
pressed against the periphery of the transmission cylinder in order to ensure an
exact engagement constantly in the same plane.
2. In driving apparatus for mechanical musical, instruments, the combination
with studs or projections formed or provided upon the music-disc N, of holes or
spaces formed or furnished in the transmission cylinder W, and of one or more
wheels or rollers mounted above the music-disc and causing the latter to press
against the periphery of the cylinder, substantially as and for the purposes
described.
Dated this Fifth day of November 1898.
For the Applicant,
GEDGE & FEENY,
60, Queen Victoria Street, London, E.C.,
Chartered Patent Agents.