Improvements in or connected with Music Sheets for Mechanical Musical Instruments.
Year: 1895

page_text: Date of Application, 26th Aug., 1895-Accepted, 28th Sept., 1895
COMPLETE SPECIFICATION.
Improvements in or connected with Music Sheets for Mechanical
Musical Instruments.
I, Dr. FRIEDRICH ADOLF RICHTER of Rudolstadt, in the Empire of Germany,
Manufacturer, 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 :-
The progressive movement of the well known long paperboard music sheets
formed or provided with perforated notes or characters is generally effected by
means of friction, whereby a great deal of power is consumed; or when paperboard
of very great thickness is employed, motion is imparted to the music sheets by
means of toothed wheels, the teeth of the said wheels engaging in corresponding
holes in the sheet. But the use of very thick and heavy paperboard increases the
cost of a music sheet to a very great extent, and also renders the same unwieldy,
moreover the propulsion of a heavy sheet requires much power and consequently a
powerful driving apparatus.
Now these drawbacks are obviated according to the present invention by
strengthening wholly or partially with sheet metal the edges of the holes formed in
the driving portions of the music sheet and which serve for the reception or
engagement of the driving teeth.
The invention will be best understood by describing same with reference to the
accompanying drawings.
The strip of sheet metal a, Fig. 1, which serves for strengthening, is provided at
its edges with claws a¹ or with small stamped-out points a", which pass through the
music sheet when the strip of sheet metal is pressed in, and thus unite the strip
firmly with the music sheet. The holes, b, Fig. 1, for the teeth of the driving
wheel are preferably punched at one and the same time through both the sheet
metal strip and the paper board together, after the sheet metal strip has already
been fixed to the paper-board.
Both parts may however be formed with the necessary holes prior to fastening
the same together if desired, and this is especially necessary in cases where the
edges of the driving holes are not merely covered over with the superposed sheet
metal strip, but are to be lined or bound internally wholly or partly with metal by
means of lugs of sheet metal bent over into the same, which has the result of
making the driving portion very much stronger.
For this purpose, those parts of the sheet metal strip a, Fig. 2, which are to form
the holes for the engagement of the teeth, are first slit in cross fashion as at c, Fig. 3,
and the four lugs d thereby formed are bent up or out in such a manner (see side
elevation Fig. 4) as to be adapted to be inserted into the holes of corresponding
size, of the driving portion. When this has been done, the sheet metal lugs are
bent round and pressed with sufficient force to cause them to bear very firmly
against the lower edge of the music sbeet (Figs. 5 and 6), and thus at the same time
to fasten the sheet metal strip firmly to the music sheet-Figure 6 is a longitudinal
section taken through the music sheet on the line x-x of Figure 5.
The driving holes in the sheet metal strip may also be formed by slitting the
sheet metal strip a at the respective places, not in cross fashion, but in H-form as
shown in Figure 7, so as to produce two lugs e which are then pressed round two
opposite edges of the driving hole.