JP3717664B2 - 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 an electronic piano or the like.
[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 rotatably attached to the chassis while being engaged with the grooves and holes. Further, the chassis is integrally manufactured by performing punching using a press die on a single metal plate (for example, steel plate) and 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.
[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. It may become. 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 provides a keyboard device for a keyboard instrument that can greatly reduce the manufacturing cost and can be easily assembled by greatly reducing the manufacturing cost of the chassis. The purpose is to do.
[0007]
[Means for Solving the Problems]
Keyboard instrument keyboard apparatus according to claim 1, directly to the shelf plate is placed, a plurality of chassis Rutotomoni arranged in the lateral direction, the boss on the surface not in contact with the shelf plate respectively provided, the plurality of chassis And a plurality of keys arranged in the left-right direction and an elongated angle member extending over the entire area in the left-right direction of the arranged keys, and a boss is provided to all of the plurality of chassis via a boss. And a connecting member that connects all the chassis to each other.
[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, greatly reducing the manufacturing cost of the chassis, and therefore the keyboard. The manufacturing cost of the apparatus can be greatly reduced.
[0009]
Moreover, all of the plurality of chassis, via a boss provided on each of them by a plurality of keys in the lateral direction elongated connecting member composed of angle member extending over the entire, since it is connected to each other, for example, the chassis The degree of freedom in assembling the keyboard device can be increased, for example, by attaching a key to a plurality of chassis connected by a connecting member before being attached to the instrument body. As such, by assembling the keyboard device outside the instrument main body before attaching to the instrument main body, the assembling work and the positional adjustment between the chassis and the keys attached to them are adjusted. Etc., and damage to the surface of the key that tends to occur when a chassis, a key, and the like are sequentially incorporated into the instrument body can be avoided. Further, since the connecting member is made of an angle member, the configuration of the keyboard device can be simplified by using the connecting member having such a simple configuration.
[0010]
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.
[0011]
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.
[0012]
In the above description, it is preferable that one type of chassis is provided with a key for an integral multiple of one octave.
[0013]
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.
[0014]
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. 1 and 2 show a keyboard apparatus for an electronic piano to which the present invention is applied. As shown in both figures, in the keyboard device 1, a large number of keys 3 are rotatably attached to a plurality of chassis 2, and the plurality of chassis 2 are connected to each other by front and rear connecting members 4, 4. In the state, it is attached to the shelf board 5.
[0015]
The plurality of chassis 2 are arranged on the shelf board 5 in the left-right direction, and the seven chassis 2 (only two are shown in FIG. 1), and the lowest and highest sound parts not shown. It consists of a total of nine chassis. Of these, the seven chassis 2 are composed of one type of chassis 2 having the same size and shape, and each chassis 2 includes one octave key 3, that is, seven white keys 30 and Twelve keys 3 composed of five black keys 31 are attached. Further, three keys 3 for the lowest sound part and one key 3 for the highest sound are respectively attached to the chassis for the lowest sound part and the highest sound part. As described above, the keyboard apparatus 1 includes a total of 88 keys 3 (only 24 keys are shown in FIG. 1).
[0016]
Each of the seven chassis 2 in the center is made of an injection molded product made of, for example, ABS resin and made of the same mold, and has a rectangular planar shape. As shown in FIG. 2, on the lower surface of the chassis 2, three bosses 2a, 2a, 2a for attaching to the shelf board 5 protrude downward with the same length and 1 in the front-rear direction (left-right direction in FIG. 2). It is formed so as to be arranged in a row at equal intervals. These one row of bosses 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). Further, two front connection bosses 2c and 2c (only one is shown) for attaching the front connection member 4 between the front and center bosses 2a and 2a are provided at the left and right ends of the lower surface of the chassis 2. Similarly, two rear connecting bosses 2c and 2c (only one shown) for attaching the rear connecting member 4 project downward from the rear boss 2a. Is formed.
[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]
The nine chassis are connected to each other by the front and rear connecting members 4 and 4. Each connecting member 4 is in the form of an elongated angle having a length extending over the entire left and right direction of the chassis 2, and is formed of, for example, an aluminum alloy extruded product. As shown in FIG. 2, the connecting member 4 is formed in an inverted L-shaped cross section by a horizontal mounting portion 4 a and a vertical portion 4 b extending upward from the rear end. The front connecting member 4 is a portion of the mounting portion 4a and is fixed to the front connecting bosses 2c, 2c formed on the left and right ends of each chassis 2 with screws 6, 6 from below. Similarly, the rear connecting member 4 Are fixed to the rear connection bosses 2c, 2c from below with screws 6, 6 (see FIG. 1).
[0019]
Each of the white key 30 and the black key 31 is made of, for example, an injection molded product made of ABS resin. The structure of the white key 30 will be described below by taking the white key 30 as an example. A flexible portion 30a extending downward and a mounting portion 30b extending backward from the flexible portion 30a are formed at the rear end portion of the white key 30. The flexible portion 30a is formed to have a thickness that is elastically deformed and bent when the white key 30 is pressed, and the mounting portion 30b is configured so that the white key 30 is always in a slanting back-down posture. It is fixed to the upper surface of the rear end portion of the chassis 2 via screws 5. A hook-shaped stopper portion 30 c is formed at the front portion of the white key 30, and the stopper portion 30 c protrudes downward through the hole 2 d of the chassis 2.
[0020]
On the other hand, a rubber lower limit stopper 2e and an upper limit stopper 2f are respectively attached to the upper surface and the lower surface of the chassis 2. With the above configuration, the white key 30 has a key release position (position shown in FIG. 2) that is obliquely rearward and downward where the stopper portion 30c contacts the upper limit stopper 2f, and a key press that the lower surface of the white key 30 contacts the lower limit stopper 2e. It is attached to the chassis 2 so as to be rotatable with respect to a position (not shown), and is normally located at a key release position.
[0021]
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 g that guides the swinging of the white key 30 is erected on the stepped portion. By the key guide 2g, the white key 30 is guided so as not to move in the left-right direction when the white key 30 is swung.
[0022]
A key switch 7 for detecting the key pressing state of the key 3 is provided at the center of the chassis 2. The key switch 7 includes a printed circuit board (hereinafter referred to as a “board”) 7a screwed to the chassis 2 and a switch body 7b provided on the upper surface thereof. The switch body 7b protrudes upward through a hole 2h formed in the chassis 2 and is connected to a control device (not shown) that controls sound generation of the electronic piano through the substrate 7a. On the other hand, an actuator portion 30d that protrudes downward is formed at the center of the white key 30, and the actuator portion 30d is always in contact with the upper surface of the switch body 7b. Therefore, as the white key 30 is depressed, the actuator unit 30d depresses the switch body 7b to turn it on, thereby detecting the depressed state of the white key 30. The control device controls the sound generation of the electronic piano according to the detection result.
[0023]
The white key 30 is configured as described above, and although the description is omitted, the black key 31 is configured in substantially the same manner as the white key 30.
[0024]
The keyboard device 1 having the above-described configuration, for example, after assembling the chassis 2, the key 3 and the front and rear connecting members 4, 4, and the like, and further adjusting the positional relationship between the chassis 2 and between the keys 3, 5 is attached. This attachment is performed by screwing (not shown) through the left and right rows of bosses 2a formed in each chassis 2 and holes (not shown) formed in the shelf plate 5 corresponding thereto. In addition, this shelf board 5 is comprised by the extrusion molding product etc. of the aluminum alloy.
[0025]
According to the keyboard apparatus 1 of the present embodiment configured as described above, the chassis for attaching the key 3 includes seven chassis 2 for one octave and two for the lowest and highest sound parts. 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 3 in the keyboard instrument is usually repeated every octave, the size of the seven chassis 2 is determined by attaching the key 3 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.
[0026]
Also, if the chassis 3 is standardized by making the dimensions and shape of the keys 3 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.
[0027]
Further, since the seven chassis 2 and the two chassis for the lowest sound part and the highest sound part are integrally connected to each other by the connecting member 4, as described above, the chassis 2 is attached to the shelf board 5 or the like. The degree of freedom in assembling the keyboard device 1 is increased, for example, the key 3 can be attached to the chassis integrally connected by the connecting member 4 before the attachment. As such, before assembling to the shelf board 5, for example, by assembling the keyboard device 1 outside the instrument body, the assembling work and positions between the chassis and between the keys 3 attached to them The related adjustment work can be easily performed, and damage to the surface of the key 3 that is likely to occur when the chassis 2 and the key 3 are sequentially incorporated in the instrument body can be avoided.
[0028]
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 3 to the chassis 2 are slightly different. The configuration is almost the same as that of the keyboard device 1. Although not shown in particular, the chassis 2 is divided into a total of nine chassis, including seven chassis 2 and a chassis for the lowest and highest sounds. They are connected to each other by front and rear connecting members 4 and 40 extending in the direction. The white key 30 is rotatably supported by a rotation fulcrum 9 provided at the rear end portion of the chassis 2, and an engagement protrusion 30 a at the rear end portion of the upper surface thereof is connected to the rear connecting member via the return spring 8. 40. Thus, the white key 30 is always urged in the key release direction. The black key 31 is similarly configured.
[0029]
According to the keyboard device 1 of the present embodiment configured as described above, the divided chassis 2 is integrally connected by the two connecting members 4 and 40 in the same manner as the keyboard device 1 of the first embodiment. . As a result, the manufacturing cost can be greatly reduced and the assembly is facilitated.
[0030]
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 10 that rotates in response to a key pressing operation of the key 3, a point that the hammer 10 presses 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 3 to the chassis 2 are slightly different. In particular, although not shown, the chassis 2 is divided into a total of nine chassis, including seven chassis 2 and the chassis for the lowest and highest sounds. They are connected to each other by three connecting members 4, 41, 4 that extend in the direction. The front and rear connecting members 4 and 4 are screwed to the bosses 2c and 2c, respectively. The central connecting member 41 includes upper and lower mounting portions 41a and 41b extending horizontally. The upper mounting portion 41a is screwed to the substrate 7 and the lower mounting portion 41b is screwed to the shelf plate 5, respectively.
[0031]
According to the keyboard device 1 of the present embodiment configured as described above, the divided chassis 2 is integrally connected by the three connecting members 4, 41, 4 as with the keyboard device 1 of the first embodiment. Is done. As a result, the manufacturing cost can be greatly reduced and the assembly is facilitated.
[0032]
In each of the above embodiments, 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 (such as a synthesizer), You may apply to an acoustic 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.
[0033]
Further, in each of the above embodiments, the key 3 is made of ABS resin, but the material of the key 3 is not limited to this, and may be a metal such as steel, other synthetic resin (for example, polystyrene or polyacetal) and a wood material. Good. Moreover, although the connection member 4 was comprised with the aluminum alloy, you may comprise not only this but other metals, such as steel. Furthermore, 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.
[0034]
Moreover, in each said embodiment, although the some chassis 2 divided | segmented by the connection member 4 or the connection members 40 and 41 extended in the left-right direction was mutually connected, it is not restricted to this but the connection extended in the front-back direction You may make it connect the both-sides edge part of each chassis 2 to the one side edge part of the adjacent chassis 2 with a member, respectively.
[0035]
【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 greatly reduced and the assembly can be easily performed by greatly reducing the manufacturing cost of the chassis.
[Brief description of the drawings]
FIG. 1 is a bottom view in which a part of an electronic piano keyboard device according to a first embodiment of the present invention is omitted.
FIG. 2 is a side sectional view of the keyboard device of FIG. 1;
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]
DESCRIPTION OF SYMBOLS 1 Keyboard apparatus 2 Chassis 3 Key 4,40,41 Connecting member

Claims (3)

Directly to the shelf plate is placed, a plurality of chassis boss respectively provided Rutotomoni arranged in the lateral direction, not in contact with the shelf plate surface,
A plurality of keys that are rotatably provided in the plurality of chassis and arranged in the left-right direction,
A connecting member that is formed of an elongated angle member extending over the entire region in the left-right direction of the plurality of arranged keys, is attached to all of the plurality of chassis via the boss, and connects all the chassis to each other. A keyboard device for a keyboard instrument characterized by the above. 2. A keyboard device for a keyboard instrument according to claim 1, wherein at least a part of the plurality of chassis is constituted by 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 2, wherein keys of an integral multiple of one octave are provided in the one type of chassis.

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