JPH05224664A - Key driving device of player piano and its manufacture - Google Patents

Abstract

PURPOSE:To provide the key driving device of the player piano which can be mounted on the piano without reference to the kind of the piano and to provide the manufacture of the key driving device of the player piano which is applicable when a piano which is already delivered to a user is remodeled into a player piano and facilitates the remodeling operation. CONSTITUTION:Fixation holes 15 for fixing electromagnetic plungers 9 which are as many as keys are arranged in a shelf plate 3 zigzag in the array direction of the keys. The electromagnetic plungers 9 are fitted and fixed in the fixation holes 15. A post reed 11 is formed of a U-sectioned iron plate, etc., in rail type structure extending long in the array direction of the keys and a driving circuit board 13 which generates a driving signal for driving the electromagnetic plungers 9 is installed therein, and post reed felt 17 is stuck on the part of its top surface which is in contact with the reverse surfaces of the keys 1 by using an adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key driving device used for keyboard operation of an automatic piano and a method for manufacturing the same, and more particularly to a modification of a piano having no automatic performance function to an automatic piano for automatic performance. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key driving device for an automatic piano suitable for application and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a key driving device for a keyboard of an automatic piano, for example, a long metal mounting member to which an electromagnetic plunger is attached corresponding to each key arrangement position of the keyboard is used. ..

A unitized mounting member is also used as a structure of a common yoke of a plurality of electromagnetic plungers. The mounting member to which such an electromagnetic plunger is mounted is usually arranged in a groove provided so as to extend in the key arranging direction between the reed and the reed of the piano, and is mounted by a screw or the like.

[0004]

However, since the conventional lock driving device has the above structure, it has the following problems. That is, the mounting position of the electromagnetic plunger is determined by the mounting member, but this mounting member is divided for the high sound range, the low sound range, or the middle sound range. Since the method of division depends on the type of piano, it cannot be attached to anything other than a fixed type of piano.

Further, it is necessary to make a groove for attaching the attaching member to the shelf board, which makes the processing of the shelf board difficult. INDUSTRIAL APPLICABILITY The present invention provides a key driving device for an automatic piano that can be attached to a piano regardless of the type of the piano, and can be applied to a modification of the piano already delivered to the user to an automatic piano, and in a short time. An object of the present invention is to provide a method of manufacturing a key driving device for an automatic piano, which enables modification work.

[0006]

According to a first aspect of the present invention, each key of the keyboard is individually operated by an electromagnetic plunger arranged below the keyboard of the piano so as to face each key. A key driving device for an automatic piano is characterized in that each of the electromagnetic plungers is housed and fixed in a fixing hole arranged independently of each other on a shelf plate of the piano.

According to a second aspect of the present invention, the electromagnetic plunger has a non-magnetic pipe protruding downward, and the fixing hole is a cylindrical hole for accommodating the non-magnetic pipe of the electromagnetic plunger. It is characterized by The invention according to claim 3 is characterized in that the cylindrical fixing holes are arranged in a staggered manner along the arrangement direction of the keys of the shelf plate.

The invention according to claim 4 is characterized in that, among the electromagnetic plungers arranged in a zigzag manner, the stroke of the electromagnetic plunger closer to the reed is shorter than the stroke of the electromagnetic plunger far from the reed. According to a fifth aspect of the present invention, a key driving device for an automatic piano is arranged so as to extend in a direction in which the keys are arranged after a reed on the drive circuit board that drives the electromagnetic plunger and the reed on the shelf board. It is further characterized by further comprising: a storage support member having a storage part for storing the drive circuit board and a support part for supporting one end of each key.

According to a sixth aspect of the invention, a step of providing fixing holes independent of each other for accommodating and fixing an electromagnetic plunger for driving each key of the piano keyboard on the shelf board of the piano, and the electromagnetic plunger in the fixing hole. A method of manufacturing a key driving device for an automatic piano, characterized by comprising:

[0010]

In the invention described in claims 1 to 5, since the electromagnetic plungers are housed and fixed in the fixing holes arranged independently of each other on the piano shelf, the keys are arranged at the respective key arrangement positions of the individual pianos. , It becomes possible to easily fix the electromagnetic plungers in an array, and it becomes possible to attach the key drive mechanism of the automatic piano regardless of the model of the piano.

According to the invention of claim 6, a fixing hole for accommodating and fixing an electromagnetic plunger for driving each key of the piano keyboard is provided on the shelf plate of the piano, and the electromagnetic plunger is attached to the fixing hole. As a result, it is possible to freely use a piano that has been abandoned to be converted to an automatic piano due to reasons such as being unable to install the piano on old instruments or taking a long time to process.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a key driving device for an automatic piano according to this embodiment. In FIG. 1, a keyboard 1 is installed rotatably in the vertical direction with a reed inside 7 of a reed 5 installed on a shelf 3 as a fulcrum. Electromagnetic plungers 9 are reed 7 and reed 1
It is fixed between the keyboard 1 and the shelf 3 in the middle of 1. The reed 11 has a structure in which the drive circuit board 13 is housed inside and fixed to the shelf board 3 so as to support one end of the key.

FIG. 2 is a partially cutaway perspective view around the electromagnetic plunger installation portion. As can be seen from FIG. 2, the shelf plate 3 has a fixing hole 15 for fixing the electromagnetic plunger 9.
Two rows are provided in the length direction of the key. The fixing holes 15 are arranged in a staggered manner along the direction of arrangement of the keys in correspondence with the number of keys, and the electromagnetic plungers 9 are fitted and fixed in the fixing holes 15.

The stroke of the plunger that moves when a signal current is supplied to the electromagnetic plunger 9 is such that the stroke of the electromagnetic plunger 9a installed in the row closer to the reed 7 is the electromagnetic plunger installed in the row farther from the reed 7. It is set shorter than the stroke of 9b. This is because the distance from the center of rotation of the key differs between the near row and the far row, which corresponds to the difference in the vertical movement distance of the key.

Further, the reed 11 has a rail-shaped structure made of an iron plate or the like having a U-shaped cross section and extending long in the key arrangement direction, and the electromagnetic plunger 9 is provided therein.
Drive circuit board 13 for generating a drive signal for driving
The reed felt 17 is attached to the upper surface of the key 1 in contact with the lower surface of the key 1 with an adhesive or the like. The drive circuit board 13 is connected to the electromagnetic plunger 9 by a cable 19, and is also connected to a control unit (not shown) by several signal cables. And after this reed 1
1 is fixed to the shelf plate 3 with a mounting wood screw (not shown) or the like. The rear part 11 corresponds to the storage support member.

Further, the electromagnetic plunger 9 and its surroundings will be described in detail with reference to FIG. FIG. 3 is a cross-sectional view of the electromagnetic plunger 9 shown in FIG. 1 and its surroundings, and shows just before fixing to the shelf plate 3.

The electromagnetic plunger 9 includes a yoke 21 having a square cross section, a bobbin 23 provided inside the yoke 21, and a coil 25 wound around the outer peripheral surface of the bobbin 23.
A non-magnetic pipe 27 fitted in the bobbin 23, a movable yoke 29 fitted in the non-magnetic pipe 27 and slidable in the vertical direction, and a shaft 31 vertically movable integrally with the movable yoke 29. And the key 1 provided on the shaft 31
Push-up button 33 for pushing up, a fixed yoke 35 having a through hole for slidably supporting the shaft 31, a spring 37 for elastically supporting the movable yoke 29, and a cushioning material made of felt or the like for noise prevention. 39 and 41 are provided.

The bobbin 23 has flange portions 43 and 45 provided at both upper and lower ends, a cylinder portion 47 extending further below the lower flange portion 45, and a bottom portion 49 connected to the cylinder portion 47. And the above non-magnetic pipe 2
7 is inserted into the cylinder portion 47.

The upper portion of the movable yoke 29 is formed in a concave shape, and the lower portion of the fixed yoke 35 is formed in a convex shape correspondingly, and a strong magnetic force is generated between them. There is. The fixed yoke 35 has a structure in which it is closely fixed to the yoke 21 by caulking or the like.

The shelf plate 3 is provided with a fixing hole 15. The fixing hole 15 has a diameter substantially the same as or slightly larger than that of the non-magnetic pipe 27 so that the cylinder portion 47 of the electromagnetic plunger 9 can be accommodated therein, and the depth thereof is substantially the same as the length of the protruding portion of the non-magnetic pipe 27. It is a cylindrical hole.

When manufacturing an automatic piano, the electromagnetic plunger 9 is pushed into the fixing hole 15 and fixed. In addition, when modifying a piano that does not have an automatic performance function into an automatic piano, remove the keyboard 1 from the piano body and insert the shelf 3
Then, the fixing holes 15 are formed in a zigzag pattern with an electric drill or the like.
The electromagnetic plunger 9 is fitted and fixed in each fixing hole 15, the reed 11 having the drive circuit board 13 is attached to the shelf board 3 with a screw, and the drive circuit board 13, the electromagnetic plunger 9 and a control unit (not shown) are connected by a cable. Connecting.

As described above, according to this embodiment, a special mounting member for mounting the electromagnetic plunger 9 is unnecessary, and regardless of the type of piano, the cylinder to the shelf plate at the key arrangement position is arranged. The key driving device can be installed in any piano by forming the fixing hole for the electromagnetic plunger. Further, since the processing can be performed only with a simple tool such as an electric drill, it can be easily attached to a piano already delivered to the user's house and easily converted into an automatic piano.

[0023]

As described above, according to the present invention, it is possible to provide a key driving device for an automatic piano having a simple structure which requires no special parts. Further, since the key driving device can be obtained by forming the fixing hole in the shelf board and attaching the electromagnetic plunger to the hole, the automatic piano can be manufactured or modified into the automatic piano by a simple operation.

[Brief description of drawings]

FIG. 1 is a side view of a key driving device of an automatic piano according to an embodiment.

FIG. 2 is a partially cutaway perspective view around an electromagnetic plunger installation portion.

FIG. 3 is a cross-sectional view of the electromagnetic plunger 9 shown in FIG. 1 and its surroundings.

[Explanation of symbols]

1 ... Keyboard 3 ... Shelf Board 5 ... Reed 7 ... Reed Medium 9 ...
Electromagnetic plunger 11 ... After reed 13 ... Drive circuit board 15 ... Fixing hole
27 ... Non-magnetic pipe

Claims (6)

[Claims] 1. A key driving device for an automatic piano, wherein each key of the keyboard is individually operated by an electromagnetic plunger arranged below the keyboard of the piano so as to face each key. A key driving device for an automatic piano, characterized in that the keys are housed and fixed in fixing holes arranged independently of each other on a piano shelf. 2. The electromagnetic plunger has a non-magnetic pipe protruding downward, and the fixing hole is a cylindrical hole for accommodating the non-magnetic pipe of the electromagnetic plunger. 1
The key driving device for the automatic piano described in 1. 3. The key driving device for an automatic piano according to claim 2, wherein the cylindrical fixing holes are arranged in a zigzag pattern along the arrangement direction of the keys on the shelf plate. 4. The automatic piano according to claim 3, wherein the stroke of the electromagnetic plunger close to the reed of the zigzag-shaped electromagnetic plungers is shorter than the stroke of the electromagnetic plunger far from the reed. Key drive. 5. A drive circuit board for driving the electromagnetic plunger, a storage section arranged to extend in the arrangement direction of the keys after the reeds on the shelf board, for storing the drive circuit board, and each of the keys. 5. The key driving device for an automatic piano according to claim 1, further comprising: a storage support member having a support portion that supports one end of the key. 6. A step of providing independent fixing holes for accommodating and fixing an electromagnetic plunger for driving each key of a piano keyboard on a piano shelf, and a step of attaching an electromagnetic plunger to the fixing hole. A method of manufacturing a key driving device for an automatic piano, which is characterized in that