JP3670483B2 - Keyboard device for keyboard instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyboard device for a keyboard instrument used for a keyboard instrument such as an electronic piano.
[0002]
[Prior art]
Conventionally, as a keyboard device for this type of keyboard musical instrument, for example, one described in Japanese Patent Laid-Open No. 63-128397 is known. In this keyboard device, a large number of keys are mounted side by side in the left-right direction on one metal chassis (frame). The chassis is formed with a large number of grooves and holes, and each key is swingably attached to the chassis while being engaged with the grooves and holes. Further, the chassis is integrally manufactured by punching a metal plate (for example, a steel plate) using a press die or bending using a bending die. .
[0003]
On the other hand, there is a keyboard device using a synthetic resin chassis instead of a metal chassis. Such a chassis made of synthetic resin is injection-molded by an injection molding machine equipped with a mold for injection molding.
[0004]
[Problems to be solved by the invention]
According to the conventional keyboard device described above, since all the keys are mounted on one chassis, the chassis has a larger size than the width (length in the left-right direction) of the entire keys. For this reason, a press die, a bending die, an injection mold, a manufacturing facility including a press machine and an injection molding machine, which are used when processing the chassis, are increased in size, leading to an increase in manufacturing cost. Yes. In addition, the position of holes and key guides formed in the chassis may shift due to manufacturing errors of the mold during the trial manufacture stage of the chassis, and it is necessary to adjust the mold to align these positions. May be. In this case, because the mold is large, the range in which the positional deviation of the grooves and holes should be adjusted is widened, so that it takes time to adjust the mold, resulting in further increase in manufacturing cost. There's a problem.
[0005]
Further, the keyboard device is not limited to the normal 88 keys, and there are various keyboard numbers. However, if a mold for processing a chassis for 88 keys, for example, is manufactured, this cannot be diverted to processing a chassis for 76 keys. For this reason, when many types of chassis having different numbers of keys are manufactured, many types of molds must be manufactured separately, and the manufacturing cost is further increased.
[0006]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a keyboard device for a keyboard instrument that can greatly reduce the manufacturing cost by greatly reducing the manufacturing cost of the chassis.
[0007]
[Means for Solving the Problems]
Keyboard instrument keyboard apparatus according to claim 1, comprising a plurality of chassis arranged in the horizontal direction, and a plurality of keys arranged in a pivotably arranged and the lateral direction to the plurality of chassis, a plurality of each chassis is composed of a single part, directly to the apparatus main body, and wherein the attached Rukoto.
[0008]
According to the keyboard device of this keyboard instrument, the chassis for one keyboard device is divided into a plurality of parts and can be manufactured separately. Therefore, the conventional chassis for manufacturing one chassis for one keyboard device is used. Compared to the case, the size per chassis can be reduced. As a result, the manufacturing equipment used to manufacture the chassis, including the molds and presses, can be downsized, and the mold adjustment at the prototype stage can be facilitated, reducing the manufacturing cost of the chassis, that is, the manufacturing cost of the keyboard device. can do. In addition, since each of the plurality of chassis is composed of a single part and directly attached to the apparatus main body, a plurality of chassis can be directly attached to the apparatus main body without using special parts. The score can be reduced.
Further, in the above, each of the plurality of chassis integrally includes a plurality of reinforcing ribs extending in the front, rear, left, and right, and integrally projecting downward, and is connected to the apparatus main body via the plurality of bosses. It is preferable that it is attached.
[0009]
In the above, it is preferable that at least a part of the plurality of chassis includes a plurality of types of chassis having the same size and shape as each other.
[0010]
According to the keyboard device of this keyboard instrument, the chassis used for one keyboard device can be shared, and the types of molds used for chassis manufacture can be reduced. Thereby, the manufacturing cost can be further reduced.
[0011]
In the above, it is preferable that one type of chassis is configured as a key chassis for an integral multiple of one octave.
[0012]
In a general keyboard device, the arrangement of white keys and black keys is repeated every octave. Therefore, if the chassis is divided into units of octaves as in the keyboard device of this keyboard instrument, The chassis can be easily shared. If the size and shape of the white key and the black key are standardized between the keyboard devices having different numbers of keys, one type of chassis can be applied to various keyboard devices having different numbers of keys. Therefore, the manufacturing cost of the keyboard device for the keyboard instrument can be greatly reduced. In particular, if the chassis is divided and configured for one octave key, most of the keyboard can be configured with one type of chassis in one keyboard device, and the range of keyboard devices to which the chassis can be applied is maximized. be able to.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a keyboard device for a keyboard instrument according to a first embodiment of the present invention will be described with reference to the accompanying drawings. The keyboard device of this embodiment is used for an electronic piano (not shown). As shown in FIG. 1, in the keyboard device 1, nine chassis 2 are arranged on a shelf board (device main body) 3 in the left-right direction. Installed side by side. That is, seven chassis 2 (only two are shown in FIG. 1) and a chassis for the lowest sound part and the highest sound part (not shown) are attached to the shelf board 3. The seven chassis 2 are composed of one type of chassis having the same size and shape, and each chassis 2 has one octave key 4, that is, seven white keys 40 and five black keys. Twelve keys 4 composed of keys 41 are attached. Also, three keys 4 for the lowest sound part and one key 4 for the highest sound are respectively attached to the chassis for the lowest sound part and the highest sound part. Thus, the keyboard apparatus 1 includes a total of 88 keys 4 (only 24 keys are shown in FIG. 1).
[0016]
The chassis 2 is a part made of ABS resin which is injection-molded into a rectangular shape in a plane. As shown in FIG. 2, the front, middle and rear three bosses 2a, 2a and 2a are provided on the lower surface of the chassis 2 in the front-rear direction. They are formed in a row (in the left-right direction in FIG. 2) at equal intervals and projecting downward. These one row of bosses 2a, 2a, 2a are respectively provided at the left and right end portions of the chassis 2 (only one row is shown), and the chassis 2 includes a total of six bosses 2a. Each boss 2a is integrally formed with four ribs 2b for reinforcement in the front-rear and left-right directions (only three are shown). On the other hand, the shelf board 3 is an extruded aluminum alloy part, and six holes (not shown) are provided at positions corresponding to the six bosses 2a. The chassis 2 is firmly fixed to the shelf board 3 by passing screws 3a through these holes and screwing them into holes (not shown) in the bosses 2a.
[0017]
On the other hand, the chassis for the lowest sound part and the highest sound part are formed by injection-molding a V-shaped grooved chassis by using an insert mold for the mold of the injection molding machine for the chassis 2, respectively. It is manufactured by cutting the chassis along a groove.
[0018]
Each of the white key 40 and the black key 41 is an injection molded part made of ABS resin, and the configuration of the white key 40 will be described below. A flexible portion 40a extending downward and a mounting portion 40b extending backward from the flexible portion 40a are formed at the rear end portion of the white key 40. The mounting portion 40b is fixed to the upper surface of the rear end portion of the chassis 2 via the screw 5, and the flexible portion 40a is formed to have a thickness that is elastically deformed and bent when the white key 40 is pressed. ing. On the other hand, a rubber lower limit stopper 2c and an upper limit stopper 2d are respectively attached to the upper surface and the lower surface near the front of the central portion of the chassis 2. Further, a hook-like stopper portion 40c is formed on the front side of the central portion of the white key 40, and the stopper portion 40c protrudes downward through the hole 2e of the chassis 2 and its tip portion is the upper limit. It is always in contact with the stopper 2d. With the above configuration, the white key 40 has a key release position (position shown in FIG. 2) that is obliquely rearward and downward where the stopper portion 40c comes into contact with the upper limit stopper 2d and a key press where the lower surface of the white key 40 comes into contact with the lower limit stopper 2c. It is attached to the chassis 2 so as to be swingable with respect to a position (not shown), and is normally located at a key release position.
[0019]
Further, a stepped portion that is one step lower is formed at the front end portion of the chassis 2, and a key guide 2 f that guides the swinging of the white key 40 is erected on the stepped portion. The white key 40 is guided by the key guide 2f so as not to move in the left-right direction when the white key 40 is swung.
[0020]
A printed circuit board (hereinafter referred to as “board”) 6 is screwed to the lower surface of the central portion of the chassis 2. A key switch 7 is provided on the upper surface of the substrate 6, and the key switch 7 protrudes upward through a hole (not shown) formed in the chassis 2. The key switch 7 is connected to a control device (not shown) for controlling the sound generation of the electronic piano via the substrate 6. On the other hand, an actuator portion 40 d that protrudes downward is formed at the center of the white key 40, and the actuator portion 40 d is always in contact with the upper surface of the key switch 7. Therefore, when the white key 40 is depressed, the key switch 7 is depressed, and the electronic piano generates a piano sound as it is turned on. The white key 40 is configured as described above, and although the description is omitted, the black key 41 is configured in substantially the same manner as the white key 40.
[0021]
According to the keyboard device 1 of the present embodiment configured as described above, the chassis for attaching the key 4 includes seven chassis 2 for one octave, and two chassis for the lowest sound part and the highest sound part. Since it is divided into individual chassis, it is possible to reduce the size of manufacturing equipment including injection molds and injection molding machines used for manufacturing the chassis. In addition, mold adjustment at the prototype stage is facilitated by downsizing the mold. In addition to this, since the arrangement of the keys 4 in the keyboard musical instrument is normally repeated every one octave, the size of the seven chassis 2 is determined by attaching the key 4 for one octave to the chassis 2. The shape and the like can be made the same, and the mold for manufacturing the chassis 2 can be shared. Furthermore, by using the insert mold as the mold for manufacturing the chassis 2, the chassis for the highest sound part and the lowest sound part can be manufactured, respectively, and all the chassis of the keyboard device 1 can be manufactured with one mold. . Therefore, the manufacturing cost of the chassis 2 can be greatly reduced, and the manufacturing cost of the keyboard device 1 can be greatly reduced.
[0022]
Further, if the chassis 4 is standardized by making the size and shape of the key 4 the same among the keyboard devices having different numbers of keys, the chassis 2 can be applied not only to the keyboard device 1 but also to other keyboard devices having different numbers of keys. The manufacturing cost of the keyboard device can be greatly reduced. Furthermore, since the chassis 2 can be directly attached to the shelf board 3 without using special parts, the number of parts can be reduced.
[0023]
Next, a keyboard device for a keyboard instrument according to a second embodiment of the present invention will be described. As shown in FIG. 3, the keyboard device 1 of the present embodiment is the same as that of the first embodiment except that the cross-sectional shape of the chassis 2 and the configuration of the attachment portion of the rear end portion of the key 4 to the chassis 2 are slightly different. A configuration similar to that of the keyboard device 1 is provided. In particular, although not shown, the chassis 2 is divided in units of one octave, and the seven chassis 2 are configured to have the same size and shape. Therefore, also with the keyboard device 1 of the present embodiment, the manufacturing cost can be greatly reduced as with the keyboard device 1 of the first embodiment.
[0024]
Furthermore, a keyboard device for a keyboard instrument according to a third embodiment of the present invention will be described. As shown in FIG. 4, the keyboard device 1 of the present embodiment includes a hammer 8 that rotates as the key 4 is depressed, a point that the hammer 8 depresses the key switch 7, and a chassis. 2 has a configuration substantially similar to that of the keyboard device 1 of the first embodiment, except that the cross-sectional shape of 2 and the configuration of the mounting portion of the rear end portion of the key 4 to the chassis 2 are slightly different. Although not shown in particular, the chassis 2 is divided in units of one octave, and the seven chassis 2 are configured to have the same size and shape. Therefore, also with the keyboard device 1 of the present embodiment, the manufacturing cost can be greatly reduced as with the keyboard device 1 of the first embodiment.
[0025]
In the embodiment described above, the keyboard device 1 of the present invention is applied to an electronic piano. However, the keyboard device 1 of the present invention is not limited to this, and other electronic musical instruments (for example, synthesizers, etc.) The present invention may be applied to a piano type keyboard instrument. Moreover, although the chassis 2 is made of ABS resin, the material of the chassis 2 is not limited to this, and other synthetic resins (for example, polystyrene, polyacetal, etc.) and ceramics may be used. Moreover, you may manufacture the chassis 2 by giving the punching process using a press die to a steel plate, or performing the bending process using a bending die. In this way, the manufacturing equipment used for manufacturing the chassis 2 including the mold and press machine can be downsized, and as described above, the manufacturing cost of the keyboard device can be greatly reduced. Furthermore, in the above embodiment, the key 4 is made of ABS resin. However, the material of the key 4 is not limited to this, and may be a metal such as steel, other synthetic resins (for example, polystyrene or polyacetal) and a wooden material. . In addition, in order to manufacture the chassis for the lowest sound part and the highest sound part, by using an insert mold for the mold of the injection molding machine for the chassis 2, a chassis with a V-shaped groove is injection molded. However, by changing the shape of the mold of the injection molding machine for the chassis 2, the chassis 2 itself may be injection molded as a chassis with a V-shaped groove and used for the keyboard device 1.
[0026]
【The invention's effect】
As described above, according to the keyboard device of the keyboard musical instrument of the present invention, the manufacturing cost can be significantly reduced by greatly reducing the manufacturing cost of the chassis.
[Brief description of the drawings]
FIG. 1 is a plan view of a keyboard device for a keyboard instrument according to a first embodiment of the present invention.
FIG. 2 is a side sectional view of the keyboard device.
FIG. 3 is a side sectional view of a keyboard apparatus for a keyboard musical instrument according to a second embodiment.
FIG. 4 is a side sectional view of a keyboard apparatus for a keyboard musical instrument according to a third embodiment.
[Explanation of symbols]
1 Keyboard device 2 Chassis 3 Shelf board (device body)
4 keys

Claims (4)

A plurality of chassis arranged in the left-right direction;
A plurality of keys provided swingably on the plurality of chassis and arranged in the left-right direction ,
Wherein the plurality of chassis, respectively, consists of a single part, directly to the apparatus main body, the attached keyboard instrument according to claim Rukoto keyboard device. Each of the plurality of chassis integrally includes a plurality of reinforcing ribs extending in the front, rear, left, and right directions, and has a plurality of bosses protruding downward, and is attached to the apparatus main body via the plurality of bosses. The keyboard device for a keyboard instrument according to claim 1, wherein the keyboard device is a keyboard instrument. The keyboard device for a keyboard instrument according to claim 1, wherein at least a part of the plurality of chassis includes a plurality of types of chassis having the same size and shape as each other. The keyboard device for a keyboard instrument according to claim 3, wherein the one type of chassis is configured as a chassis for keys of an integral multiple of one octave.

Images