Improvements in Devices for Turning Music Sheets.
Year: 1890

page_text: Date of Application, 16th May, 1890-Accepted, 21st June, 1890
COMPLETE SPECIFICATION.
Improvements in Devices for Turning Music Sheets.
I, JOHANN FRIEDRICH CHRISTOPHER GRÜN of Zeughausmarkt No. 42 Hamburg
in the Empire of Germany, Gentleman, do hereby declare the nature of this inven
tion 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 the contrivances for mechanically reversing music sheets
during the progress of the piece and has for its purpose to provide a device of this
class which is comparatively simple and more reliable in action than the turning
mechanisms hitherto known.
Referring to the accompanying drawing in which like letters indicate like or
analogous parts throughout the various figures,
Figs. 1 and 2 are perspective views and
Figs. 3 and 4 end views from the left and right respectively.
Said
A prismatic guide piece A which is destined to support the entire mechanism is
attached to the music desk P by means of two holders or angle pieces a.
holders fit into tubes 6 secured on the desk, whereby the guide piece A is rendered
adjustable to the thickness of the music book N.
In the above mentioned piece A is guided a slide block B to the underside of
which are attached an eye or loop c, serving to receive the cord d, and a peg e.
This loop and also the peg or nut è project from slots in the bottom side of the guide
piece, on which is provided between to angle pieces a core or rod which is
surrounded by a helical spring h. On said core 9 slides the peg e, compressing
the springh on the forward movement of the slide block, while, on the cord or
pedal being released, the spring h throws back the peg i.e. the slide block B.
9
On the upper side of the block is provided, revoluble about pin i, the fold
producer the nave of which is rigidly connected with the pinion which gears
into the rackbar m. At the other end of the slide block is lodged in a bearing n
the sheet reverser, consisting of the turning rod O and the toothed segmental piece O',
adapted to engage into a toothed bar p after the fold producer has made one quarter
revolution and then to complete the stroke simultaneously with the latter, the
fold producer however moving in the horizontal, and the reverser in the nearly vertical
plane.
The mechanism for turning back music sheets for repetition consists of a second
reverser g turning in a bearing r. The latter is mounted on a short slide block C
moving in the guide piece A and adapted to be coupled with the other slide block B
by aid of a pivot or pins which is attached to a two-armed levert having its fulcrum
in bearing v. The two slide blocks are coupled and uncoupled by respectively
depressing the knob t¹ or 2. The toothed segmental piece of the reverser q moves,
with the forward stroke, in the rack bar u, causing the reverser q to be moved in a
similar manner as the rod O.
The improved music sheet reverser is operated in the following manner :-
On the cord d being pulled by means of the pedal or otherwise, the fold producer k
is turned to the left and the uppermost music sheet is bulged up-Fig. 1 The
reverser 0, which now rises, enters into the bulging produced, turns the sheet over
and, owing to its peculiar movement, smoothens the same, while the bulge producer
completes its revolution as far as 270 degrees.
In this final position, illustrated in Fig. 2, the slide block C can be coupled to
block B through depressing the knob t¹ of the double-armed lever t, thereby causing
the pin
s to effect the coupling by entering into a hole provided for this purpose
in the block B. On releasing the cord the repetition reverser q is turned to the right

page_text: with the reverser o, which resumes its inoperative position, and all sheets resting on
the repetition reverser are turned back simultaneously.
-
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
A music sheet reverser in which both the bulge producer and the reverser o are
mounted on a sliding block B, the latter being adapted to be coupled with another
sliding block C, to which is secured the repetition reversery, allowing the returning
slide block B to operate the reverser q, substantially as set forth.
Dated this Uth of May 18ån
JOHANN FRIEDRICH CHRISTOPHER GRÜN
Per Huelser & Co.,
142, Fleet Street. London, E.C., Attorneys.
JOHANN FRIEDRICH CHRISTOPHER GRÜN
Per Huelser & Co.,
142, Fleet Street. London, E.C., Attorneys.