JPH0532873Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This idea concerns a player piano.

[Conventional technology]

Generally, a player piano is equipped with a key driving device such as a solenoid that automatically drives the keys using an electrical signal obtained by reproducing a pre-recorded electrical signal. This type of driving device usually drives the key by pushing up the lower surface of the rear end of the key. In that case, the pivot point of the key, which is supported by the balance key pin, tends to lift up from the upper surface of the reed, which reduces the transmission efficiency of the driving force by the key drive device and prevents the key from operating smoothly. The capstan may go up beyond its normal stroke, causing the hammer to apply too much force, resulting in uneven volume, or the top surface of the key may become uneven when the key returns to rotation. This will cause some inconvenience. Therefore, as a means to solve this problem, for example, as shown in Japanese Utility Model Application Publication No. 58-118484, there is a keyboard in which the upper surface of the pivot point of the key is pressed by a pressing member to prevent the key from lifting up. The device is known.

[Problem that the invention attempts to solve]

However, in such conventional keyboard devices, a plurality of cylindrical felts are arranged on the lower surface of the pressing member in correspondence with the balance key pins of each key. There are disadvantages in that not only the number of parts required for each key is large, the assembly work is troublesome, but also the pressing force against the keys cannot be adjusted. In particular, the balance key pins of the keys are placed at different positions in the front and back for the white keys and the black keys, so it is a tedious task to arrange the felt corresponding to each balance key pin. be. Furthermore, an embodiment is disclosed in which the pressing member is made of a leaf spring without using felt, and a long groove is formed at one end of the pressing member to avoid the balance key pin. Since the positions of the keys are different, the length of the long groove must be changed between the white key and the black key, making it troublesome to manufacture the pressing member itself. Furthermore, if the lengths of the long grooves are different, the pressing force will also be different between the white key and the black key.

[Means for solving problems]

The player piano according to this invention was made to solve the above-mentioned problems, and in the player piano in which the lower surface of the rear end of the key is pushed up by the key drive device and the key is rotated around the balance key pin, the automatic piano according to the invention is The piano has a pressing member and a felt, the pressing member is made of a long plate-shaped body disposed across the direction in which the keys are arranged, and the felt is disposed over the entire length of the lower surface of the pressing member, The felt contacts the top surface of the key between the balance key pin of the white key and the balance key pin of the black key.

[Effect]

In this invention, the pressing member prevents the rotational fulcrum of the key from lifting up when the key is pressed, allowing smooth and reliable movement of the key. Since they can be placed in common, the installation work is easy.

〔Example〕

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a side sectional view of the keyboard section of the electronic piano according to this invention, and FIG. 2 is an exploded perspective view of the main parts. In these figures, a keyboard reed 2 is placed and fixed on a shelf board 1, and a plurality of white keys 4A are placed on top of the keyboard reed 2, respectively.
and a black key 4B are arranged in parallel in correspondence to the strings of each pitch so as to be swingable in the vertical direction.

The keyboard reed 2 includes a front reed 5, a middle reed 6, and a rear reed 7 that extend in common to all keys 4, and a front reed 5, a middle reed 6, and a rear reed 7 that extend in the front-rear direction of the key 4. It is formed into a lattice shape by a plurality of keyboard reeds 8, etc. that integrally connect the keyboard reeds. A plurality of oval key pins 9 are implanted on the upper surface of the front 5 in correspondence with each key 4, and the upper end of each oval key pin 9 is connected to a recess (not shown) formed in the lower surface of the front end 4a of each key 4. By being constantly engaged in the front end 4a of each key 4,
This restricts and prevents rotation in the left and right direction. On the upper surface of the reed center 6, there are provided a plurality of pieces that support each key 4 in a vertically swingable manner by being inserted into fan-shaped elongated holes 10 that are respectively drilled in the middle part of each key 4. A balance key pin 11 is implanted.
Similar to the oval key pin 9 described above, these balance key pins 11 are installed at different positions in the front and back between the white key 4A and the black key 4B, and the pins 11 of the white key 4A are different from each other.
a is located in front of the pin 11b of the black key 4B. Each key 4 supports a well-known action mechanism (not shown) by a capstan 12 implanted on the upper surface of the rear end, so that the rear end 4b normally has a felt 13 on the upper surface of the rear reed 7. The front end portion 4a is placed above the front reed 5.

A plurality of key drive devices 14 are disposed at the rear end of the lower surface of the shelf board 1, corresponding to each key 4, respectively. This key drive device 14 includes a solenoid 14A.
and a plunger 14B, the plunger 14B protrudes upward through a through hole 16 formed in the shelf board 1, and is closely opposed to or in contact with the lower surface of the rear end portion 4b of the corresponding key 4. Solenoid 14
A is excited by the application of a voltage pulse and momentarily pushes up the plunger 14B, which pushes up the rear end 4b of the key 4, causing the key 4 to push up the bottom surface of the balance key pin 11. As a pivot point, it is operated as if a key was pressed by hand. In this case, in this embodiment, the key drive device 14 is disposed on the lower surface of the shelf board, but the key drive device 14 is not limited to this, and it goes without saying that it may be formed thin and disposed on the shelf board 1.

A keyboard holder 17 is disposed above the intermediate portion of the key 4. This keyboard holder 17 is attached to the front end 4 of the key 4.
This is to prevent the balance key pin 11, the keyboard middle seat board 20, etc. from being seen from the front, as well as to prevent the balance key pin 11 and the middle seat plate 20 from being seen from the front. It has an extending length, and both ends thereof are joined to the inner surfaces of a pair of left and right arms (not shown) constituting the main body of the musical instrument, and a felt 19 is bonded to the lower surface.

Now, above the rotational fulcrum of each key 4, a keyboard lifting prevention mechanism 25, which constitutes the gist of this invention, is disposed. This anti-lifting mechanism 25 includes a pressing member 26 made of a long plate-like body that extends in common to all keys 4, and a band-shaped felt 27 that is adhered to the lower surface of this pressing member 26 over almost the entire length. and,
It is composed of a pair of left and right brackets 28 that support both ends of the pressing member 26. The felt 27
is in contact with the upper surface of each key 4 between the balance key pin 11a of the white key 4A and the balance key pin 11b of the black key 4B. The contact position of the felt 27 is the most desirable position for both the white key 4A and the black key 4B. In other words, if the felt 27 is placed in front of the balance key pin 11a of the white key 4A, it will be moved away from the balance key pin 11b of the black key 4B, so the rotation fulcrum of the black key 4B will be more likely to rise, and the black key If the balance key pin 11b of the white key 4B is placed behind the balance key pin 11b, the white key 4A will be held back from the rotational fulcrum, which will impede the key-pressing operation of the white key 4A.

The bracket 28 is attached to a set screw 29 on the shelf board 1.
The end of the pressing member 26 is placed on this bracket 28 via a coil spring 30 as an elastic member, and a set screw 3
1 and a nut 32. in this case,
The pressing member 26 is movable up and down along a set screw 31 and is urged upward by a coil spring 30. When the set screw 31 is strongly tightened, the pressing member 26 comes down and compresses the coil spring 30. The pressing force of the felt 27 to press each key 4 increases. Incidentally, the intermediate portion of the pressing member 26 is similarly fixed to the reed center 6 using a set screw and a coil spring (not shown) so that the height can be adjusted freely. 34 is a felt interposed between the reed center 6 and the key 4.

Thus, according to the electronic piano having such a configuration, since the pressing member 26 presses the upper surface of the rotational fulcrum part of each key 4 from above through the felt 27, the back of the key 4 is driven by the key driving device 14. End 4
b is pushed up and the key 4 is rotated using the lower surface of the balance key pin 11 as a rotation fulcrum, the rotation fulcrum of the key 4 does not lift up from the reed center 6, and the key 4
can operate smoothly. Therefore,
The driving force of the key drive device 14 is reliably transmitted to the key 4, improving transmission efficiency. Further, if the key 4 does not lift up, the upward stroke of the capstan 12 can be kept constant, so that the action mechanism operates smoothly and reliably, making it possible to perform well.

Furthermore, the structure is simple, and the work of attaching the pressing member 26 to the bracket 28 and the work of attaching the felt 27 to the pressing member 26 are simple and easy. Moreover, since the installation height of the pressing member 26 can be adjusted by adjusting the tightening condition of the set screw 31, the key 4
The pressing force can also be adjusted freely.

[Effect of idea]

As explained above, according to the player piano according to this invention, the structure and installation work are simple, it is possible to reliably prevent the keys from floating when the keys are pressed, and the driving force of the key drive device is used to transfer the driving force to the keys. It can be transmitted reliably. Furthermore, since the upper surface of the rotational fulcrum part of the key is pressed, there is no adverse effect on the touch feeling of the key.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the keyboard section of the electronic piano according to this invention, and FIG. 2 is an exploded perspective view of the main parts. 1... Shelf board, 2... Keyboard reed, 4... Key, 4A...
...white key, 4B...black key, 6...jochu, 11,11
a, 11b... Balance key pin, 14... Key drive device, 26... Pressing member, 27... Felt,
30...Coil spring.

Claims (1)

[Claims for Utility Model Registration] A player piano in which a key driving device pushes up the bottom surface of a rear end of a key and rotates the key around a balance key pin, the player piano having a pressing member 26 and a fuel 27.
The pressing member 26 is made of a long plate-shaped body arranged in the direction in which the keys 4 are arranged, the felt 27 is arranged over the entire length of the lower surface of the pressing member 26, and the felt 27 is the top surface of the key 4 and the white key 4A
A player piano characterized in that the player contacts a portion between the balance key pin 11a of the black key 4B and the balance key pin 11b of the black key 4B.