JP2548684Y2 - Hammer fixing device in keyboard device of electronic musical instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for fixing a hammer of a keyboard device of an electronic musical instrument such as an electronic piano and an electronic organ.

[0002]

2. Description of the Related Art Conventionally, in this type of keyboard device, FIG.
And a key c provided on a shelf a so as to be swingable at a fulcrum b as shown in FIG. 2 by pulling down a shaft d extending above the key c through the shelf a by a lever e. It is known that the key c is fixed by a rail f attached to a shaft d so as to prevent the key c from being damaged by vibration or impact when the instrument is carried or moved. Further, as a keyboard device of this kind, there is also a device in which a hammer swinging by the key is provided at a rear portion of the key, and inertia force is applied to the key by swinging of the hammer to improve a touch feeling of the key. Known (Japanese Utility Model Application 2-1499)
No. 90).

[0003]

The key fixing device having a mechanical structure as shown in FIG. 1 has a complicated structure, requires many parts, and cannot be easily assembled. Also, if this mechanically configured fixing device is applied to a keyboard device having a hammer above the rear of the key, the size of the keyboard device in the upward direction is undesirably large.

An object of the present invention is to provide a device which can fix a hammer of a keyboard device having a hammer above a rear portion of a key without making the structure complicated and large.

[0005]

According to the present invention, keys are swingably supported on a plurality of fulcrums of a keyboard chassis provided on a shelf board of an electronic musical instrument, and the keys are swung by a key above a rear portion of each key. Hammers are provided, and a stopper cushion is provided above each of the hammers so as to restrict the upward swing of the hammers.
The above object is achieved by providing a plurality of longitudinal air cushions.

[0006]

When transporting an electronic musical instrument, an air cushion that does not allow air to enter is placed between the key and the hammer, and an appropriate amount of air is injected into the air cushion by a pump or the like. When the air cushion is inflated, the key stops at the raised position, and the hammer stops against the stopper cushion above it.
Even if an impact is applied to the musical instrument during transportation, the air cushion absorbs the impact applied to the hammer, so that there is no possibility of breakage and the key can be prevented from swinging. When the transportation is over,
The air inside is removed by cutting the air cushion or opening the air inlet, and the air cushion is extracted from between the key and the hammer in preparation for playing.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
In FIG. 3, reference numeral 1 denotes a shelf board of an electronic musical instrument, 2 denotes a metal keyboard chassis constituting a keyboard device fixed on the shelf board 1, 3 denotes a reed 4 fixed to the keyboard chassis 2, and 2 shows a wooden key swingably supported by a fulcrum 6 composed of a pin 5 implanted in the key. A plurality of keys 3 are arranged to form a keyboard, and a hammer 7 is provided above the rear of each key 3 so as to swing up and down by the keys 3. When the keys 3 swing, the hammer 7 is also attached. The key 3 is swung to impart inertial force to the swing of the key 3. Reference numeral 8 denotes a stopper cushion for restricting upward swing of the hammer 7, and reference numeral 9 denotes a frame extending in the key arrangement direction to provide a cushion 10 for restricting upward movement of the key 3.

When the electronic musical instrument is transported and moved, the vibration causes the hammer 7 to swing unnecessarily, and the key 3 also swings with it, which may be damaged. In this case, a long air cushion 11 is provided between the key 3 and the hammer 7, and the elastic force of the air cushion 11 presses the hammer 7 against the stopper cushion 8 above the hammer 7 so as not to swing during transportation.

As shown in FIG. 4, the air cushion 11 has a stopper action portion 11a having a length that traverses the entire width of the keys 3 arranged and narrow extension portions 11b, 11b extending from both ends thereof. One of the extensions 11b was provided with an air inlet 12, and the other extension 11b was kept closed. Further, a guide rod 13 that stands upright from the shelf 1 is provided behind the frame 9, and the guide rod 13
This prevents the air cushion 11 provided on the rear side from shifting forward. Through holes 14a and 14b penetrating the shelf 1 are formed at positions on the left and right sides of the keyboard chassis 2 of the shelf 1 so that the extension portions 11b can be inserted therethrough for fixing, One of the through holes 1
4a was formed in a substantially triangular shape for passage through the air inlet 12.

The air cushion 11 is temporarily placed between the key 3 and the hammer 7 without being filled with air, and air is injected from an air inlet 12 to inflate the hammer 7 so that the hammer 7 is located above the stopper cushion 8. Press
The strength of the pressing force can be adjusted by the amount of air injected. In the example of FIG. 5, at the time of air injection, each extension 11b is inserted in advance through the through holes 14a and 14b of the shelf 1, and both extensions 11b are fixed to the shelf 1 with the adhesive tape 15 after the injection. I made it. These extensions 11b can be inserted into the through holes 14a and 14b and fixed to the shelf 1 after air is injected.

When transporting the electronic musical instrument, before injecting air, the air cushion 11 is placed between the key 3 and the hammer 7 as shown in FIG.
b is fixed to the shelf 1. Then, after the movement, the inside air is removed by means such as cutting off the extension 11b on the side without the air inlet 12 with scissors, and the reduced air cushion 11 is pulled out by pulling the other extension 11b. You are ready to play.

[0012]

As described above, according to the present invention, since the inflatable longitudinal air cushion is provided between the key of the electronic musical instrument and the hammer, the hammer can be used without using complicated mechanical means. The keyboard device can be fixed for movement, has a simple configuration, does not increase the size of the keyboard device, and has advantages such as easy handling.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of a conventional example.

FIG. 2 is a perspective view of a main part of FIG. 1;

FIG. 3 is a cutaway side view of the embodiment of the present invention.

FIG. 4 is a schematic perspective view of an embodiment of the present invention.

FIG. 5 is a cut-away side view of the operating state of the present invention.

FIG. 6 is a cut-away side view of the operating state of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 shelf board 2 keyboard chassis 3 key 6 fulcrum 7 hammer 8 stopper cushion 11 air cushion 11b extension part 12
Air inlets 14a, 14b through holes

Claims (2)

(57) [Scope of request for utility model registration] 1. A key is pivotally supported on a plurality of fulcrums of a keyboard chassis provided on a shelf board of an electronic musical instrument, and a hammer which is pivoted by the key is provided above a rear portion of each key. A stopper cushion is provided above each hammer to restrict swinging upward, and a single inflatable air cushion is provided between all keys and the hammer. A hammer fixing device in a keyboard device of an electronic musical instrument. 2. An end portion of the longitudinal air cushion has an extending portion extending downward from the shelf plate through a through hole formed at a portion of the shelf plate located on both sides of the keyboard chassis. 2. The hammer fixing device according to claim 1, wherein an air inlet is provided at one of the extension portions.