Year: 1896

page_text: Date of Application, 26th May, 1896-Accepted, 25th July, 1896

page_text: device v When the wheel R is rotated the lever A will be raised by the upper
cam C and the raising device » with a sheet of music will be correspondingly lifted
by the transmission gear pulleys P and P.
The holder of the music sheets o consists of a frame, which can turn in its fixed
bearings pp (Fig. 6)..
The part of the holder, guiding the music sheet is continued beyond the frame
and carries a roller g (Fig. 6). The spiral spring/f rests with one end on the sound
board S and presses the upper part of the holder o (which part carries the roller g)
against the cam C, the extreme position of the holder in its movement towards the
part S being limited by the centre pin a on which the music dises turn and a stopy
(Fig. 6).
The portions differently operative in the movement of the cams (C and C¹) are
indicated in Fig. 4 and are as follows;-
The ascending part I to II of the cam C (Figs. 1, 3 and 4) effects by means of
the lever A rotation of the rollers P and P and the raising of the device v, which
lifts one of the music sheets N into the position indicated by dotted lines in Fig. 1
during which time the cam C' holds the holder o open (ie. in the position in which it
is shown in Figs. 2 and 6). The part II to III of the cam C causes the music
sheet to be kept raised, while the cam C' closes the holder o (as shown in Fig. 6 in
dotted lines). Then follows a slight descent of the lever à on the cam C in order
to lower the raising device v sufficiently far to enable the music sheet N to run
freely on its pivota.
The part III to IV on both cams (Fig. 4) corresponds to the time during which
the instrument is playing. At IV the device v is raised again; from IV to V the
opening of the holder o by the cam C is effected and from I to IV the lowering
down of the music sheet N takes place.
The music sheet when raised and lowered is guided in guides F and Fi
(Fig. 1).
On the central pin (Fig. 6) there is adjustably mounted a disc n, which is held
in that position shown in full lines in Fig. 6 by a spiral spring w. When the
holder o 'is being closed, the music sheet N is pushed on the pin az and the spring w
compressed. The position of the disc when the spring is thus compressed is
shown by dotted lines in Fig. 6. When the holder is being opened the spring w
pushes the disen on to the end of the central pin 2 and pushes off the sheet from
the latter.
The mode of working the instrument is as follows:-
The programme index Z is placed against the desired piece of music and the
driving gear L is released by throwing in a coin or by any other suitable device.
As soon as the gear is running, the cam C raises the desired music sheet into the
dotted position (Fig. 1) then this music sheet is pushed by the holder o, under the
influence, of the cam C, on to the central pin z and brought in engagement with
the driving-wheel t. The holder o remains in this position while the music sheet is
making one revolution and the musical piece is played. At the end of the piece of
music the raising device v engages at the bottom with the music sheet the holder o
is opened by the cam C₁, the spring w removes the music sheet from the central
pin and the cam C releases the raising device v in order to allow the music sheet
to be brought back into the chamber M.
Having now particularly described and ascertained the nature of the said inveu-
tion and in what manner the same is to be performed I declare that what I
claim is ;-
1. Mechanical musical instrument with rotating automatically interchangeable
music sheet, characterised by a cam C effecting after the index Z has been
previously set to a desired part of the programme and the driving gear L released,
the raising or lowering of the music sheet N by a lever h pair of pulleys P and Pi
and a raising device connected to the latter by cords d and i and by a
cam C effecting at suitable moments the opening and closing of the- music

page_text: holder o and the putting of the music sheet N on the central pin x and the driving
wheel t.
2. The combination and arrangement of parts constituting a complete tune-
changing device for mechanical musical instruments substantially as and for the
purpose described and illustrated in the accompanying drawings.
Dated this 26th day of May 1896.
BOULT & WADE,
Agents for the Applicant.