Improvements in Devices for Turning Music Sheets.
Year: 1890

page_text: Date of Application. 16th May. 1890-Accented. 21st June. 1890
COMPLETE SPECIFICATION.
Improvements in Devices for Turning Music Sheets.
We, JOHANN FRIEDRICH CHRISTOPHER GRÜN and OTTO BANNIER both of
Zeughausmarkt 42 in the City of Hamburg in the Empire of Germany, Gentlemen,
do hereby declare the nature of our invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the following
statement:
This invention relates to a device for turning music sheets which is operated by
pulling a cord or cords by means of pedals connected with the latter.
Reference being had to the accompanying drawings,
Figs. 1 and 2 are perspective views, and
Figs. 3 and 4 represent details of the improved device.
The casing A, which is secured in any suitable manner to the music desk or table,
contains the mechanism consisting of three principal parts viz., the driving gear, the
folder and the reverser.
into a
The
The driving gear consists of rod s sliding in the guiding 9 and connected by means
of an angular piece b with a crank pin provided on the back of a cord pulley r.
latter contains a powerful band spring adapted to be wound up by pulling the cord a
and to force back the pulley and rod s into their initial position when the pull is
discontinued. The other extremity of the rod s carries a pivot z adapted to catch
fork-shaped slot of the lever c, the latter being mounted on the shaft of the
bulge or fold producing device. Said bulge producer is lodged in the block or
bearing e and consists of three parts viz. the lower portion frigidly connected with
the shaft, the upper portion f¹ connected hinge fashion with fand having its head
lined with indiarubber leather or cloth, similar to the striking hammers in pianos,
and the leaf spring f, securely fixed with one extremity to the lower portion f and
tending to press the upper portion f¹ of the fold producer firmly and elastically against
the music sheet N.
The reverser consists of a rod or folder U secured to a cap u which is placed over
the springbox of the cord puliey r. The side of cap u which is closed in front, is
provided with a segmental slot, from which projects a corresponding catch pin v
connected with the pulley.
The improved contrivance works in the following manner :-
By pulling the cord a through depressing the pedal p, the cord pulley is turned
to the left and the rail s moves horizontally to the left thereby causing the bulge
producer to turn from its inclined right handed into a vertical position, the head of
the elastic top portion f¹ describing a segmental line from right to left. This
movement causes the right hand lower corner of the music sheet to be turned to the
left bulging up the music sheet so far as to allow the now rising reverser to seize it
from the rear side, turn it over and smoothen it during the continued progress. The
segmental slot in the front side of the cap u prevents the reversing rod from
participating in this movement until the bulging of the music sheet by the bulge
producer is partly completed, thus allowing the reverser to place itself behind the
sheet at the proper moment, while the bulger is compelled to release the same as soon
as the elastic top portion slides along the wedge shaped front edge of the plate h
and is forced off the music sheet, owing to the shape of said plate.
The respective positions of the reverser when in the act of seizing the music
sheet and after the work is done are illustrated in Figs. 1 and 2 of the drawing.
On releasing the pedal p i.e. the cord a the spring r enclosed in the pulley causes
the reverser to instantly resume its inclined inoperative position while the bulge
producer also returns to its corresponding initial position.
The turning back of music sheets as required when passages of the piece are to be

page_text: repeated is effected either by a device as described arranged inversely, or by means
of a second reverser W as shown on an enlarged scale by Figs. 3 and 4, consisting
of a pulley w, cord d and pedal 7. The cord pulley w likewise forms a closed box
containing a powerful, spring whereas the reversing rod W is connected direct with
the cord pulley. When inoperative the reversing rod W rests on the indiarubber
covered pin o while the pin o' determines the turning of the reverser. When the
latter is to be engaged it is turned, by depressing the pedal q, for about 45 degrees
and fixed in this position, as shown in Fig. 4, by means of click h, which catches by
the action of a spring into a notch provided in the rim of the pulley. Said click
however is prevented from catching till a recess or indent in a loose disk provided on
the shaft coincides with the corresponding notch of the pulley. This takes place only
during the insipient turning of the reverser W, while during the further progress of
the latter said notches are displaced relatively to each other. It follows that on the
return of the reversing rod the click is allowed to slide along over the notches,
because it is equal in width to the joint thickness of disks w and i and the reverser
returns as far as pin o.
The devices described in the foregoing specification work in a very precise manner
and by their application music sheets are reversed in any desired direction in a more
secure and rapid manner than can be effected by hand.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In a device for turning music sheets
1.) A driving mechanism consisting of a cord pulley furnished with a spring
box, connecting link and rails, said driving apparatus being adapted to be operated
by means of a force revolving the disk r and to automatically resume its inoperative
position when such power ceases to act substantially as and for the purpose set forth.
2.) A bulge producer adapted to turn about a pivot and to be moved by means
of a fork c and rails from the inclined into the upright position whereby the elastic
upper portion f, pressed against the corner of the music sheet, moves the sheet
obliquely upward and is lifted at the proper moment from the sheet through
coming into contact with a wedge-shaped surface, substantially as illustrated and
described.
3.) A reverser consisting of rod U and tube u and adapted to turn about the shaft
of the cord pulley and, following the movement thereof, seize the music sheet or
sheets from the rear side through the bulge formed, reverse and smoothen it,
substantially as set forth.
4.) An apparatus for turning back music sheets for repetition consisting of a
reverser W and cord pulley w and adapted to be arrested in its upright position
by a click which simultaneously catches into notches provided in the rim of the
pulley and that of a loose disk i, while when said notches are relatively displaced it
is released so that the reverser, when the action of the motive force is discontinued,
is allowed to automatically resume its inoperative position substantially as set
forth.
Dated this 14th day of May 1890.
JOHANN FRIEDRICH CHRISTOPHER GRÜN.
OTTO BANNIER.
By Huelser & Co.,
142, Fleet Street, London, Attorneys.