JP3746375B2 - 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]
In a conventional electronic piano keyboard device, in general, a large number of keys are mounted side by side in a horizontal direction on a single 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. The chassis is integrally manufactured by punching a single metal plate (for example, a steel plate) using a press die and bending using a bending die. A keyboard device using a synthetic resin chassis instead of a metal chassis is also known. In that case, the synthetic resin chassis is generally injection-molded integrally by an injection molding machine equipped with a mold. Has been. Further, such a keyboard device is usually fixed to the shelf board with screws screwed into the chassis from the shelf side of the instrument body.
[0003]
[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 to be larger than the entire width (length in the left-right direction) of these keys. Absent. For this reason, the manufacturing equipment including press dies, bending dies and injection molding dies, and press machines and injection molding machines used for machining the chassis becomes large, which causes a significant increase in manufacturing costs. It has become. In addition, the position of holes and key guides formed in the chassis may be shifted due to manufacturing errors in the mold during the trial manufacture stage of the chassis, and mold adjustment to adjust these positions is possible. It may be necessary. In this case, since 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, and as a result, the manufacturing cost is further increased. There is.
[0004]
Further, the keyboard device is not limited to the normal 88 keys, and there are various keyboard numbers. However, since the conventional keyboard apparatus uses one chassis as a whole, it is impossible to divert, for example, a 88-key chassis mold to a 76-key chassis. For this reason, when manufacturing keyboard devices with different numbers of keys, the chassis molds for the respective numbers of keys must be manufactured separately, which further increases the manufacturing cost.
[0005]
Furthermore, since this keyboard device is fixed to the shelf of the musical instrument body by screwing into the chassis, if the chassis is made of synthetic resin, the screw holding force tends to be insufficient, and a screw fool is likely to occur. It becomes difficult to fix firmly to the shelf board. For example, in an electronic piano, the shelf board is usually made of wood material such as MDF or plywood, so the pulling force is likely to act on the screw due to warping or twisting, ensuring sufficient screw holding force. It is especially necessary to do. In order to solve such problems, it has been conventionally performed to attach a metal mounting member to the chassis and to screw the keyboard device to the shelf plate via the mounting member. However, in this case, the number of parts and the number of assembling steps are increased by requiring a separate mounting member, resulting in a further increase in cost.
[0006]
The present invention has been made to solve such a problem, and can greatly reduce the manufacturing cost by greatly reducing the manufacturing cost of the chassis. It is an object of the present invention to provide a keyboard device for a keyboard instrument that can be firmly fixed to a musical instrument body without requiring a member.
[0007]
[Means for Solving the Problems]
In order to achieve this object, a keyboard device for a keyboard instrument according to the present invention includes a shelf board in which bolt holes are formed, a plurality of chassis arranged in the left-right direction on the shelf board, and front and rear sides below the plurality of chassis. The upper horizontal chassis connecting part, which is spaced apart from each other in the direction and extends in the left-right direction, is formed with a bolt hole, the lower horizontal shelf fixing part is formed with a screw hole, and the chassis is connected The metal before and after connecting the plurality of chassis to each other by fixing the screws through the bolt holes of the chassis connecting portion to the plurality of chassis. and manufacturing of the connecting member, and a plurality of keys provided rotatably on the chassis, passed from below into the bolt hole of the shelf plate, by being screwed into the screw hole of the shelf plate fixing unit, shelves multiple chassis to the plate Characterized in that it comprises a screw with a constant, a.
[0008]
According to the keyboard device of this keyboard instrument, the chassis of the keyboard device is divided into a plurality of parts, which can be manufactured separately, so that compared to the conventional case of manufacturing one chassis for one keyboard device. The size per chassis can be reduced. As a result, it is possible to reduce the manufacturing equipment including the molds and press machines used for manufacturing the chassis, and also facilitate the mold adjustment at the prototype stage. Therefore, the manufacturing cost of the chassis and therefore the manufacturing cost of the keyboard device can be reduced. It can be greatly reduced.
[0009]
Further, since the plurality of chassis are connected to each other by the front and rear connecting members extending in the left-right direction , for example, before attaching the chassis to the instrument body, it becomes possible to attach a key to the plurality of chassis connected by the connecting member. The degree of freedom in assembling the keyboard device can be increased. As such, by assembling the keyboard device outside the instrument body, for example, before the mounting to the shelf board , the assembling work and the positional relationship between the chassis and between the keys attached to them. Adjustment work and the like can be easily performed, and damage to the surface of the key that is likely to occur when a chassis, a key, and the like are sequentially assembled on the shelf board can be avoided.
[0010]
In addition, since the chassis is fixed to the shelf board by screws screwed into the metal connection member through the bolt holes from the bottom side of the shelf board , sufficient screw retention force can be secured and troubles such as screw fools can be prevented. However, the chassis can be firmly fixed to the shelf board . In addition, a separate mounting member conventionally provided for this purpose is not required, and the manufacturing cost can be further reduced by reducing the number of parts and the number of assembly steps.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a keyboard device for an electronic piano according to a first embodiment of the present invention. As shown in both figures, the keyboard device 1 includes a plurality of chassis 2, a plurality of keys 3 that are rotatably mounted on the chassis 2 and arranged in parallel in the left-right direction, and a plurality of chassis 2 connected to each other. Connecting members 4 and 4 before and after.
[0012]
The plurality of chassis 2 are connected to each other by connecting members 4 and 4 in a state of being arranged in the left-right direction, and the seven chassis (only two are shown in FIG. 1), the lowest sound unit (not shown) and the highest It consists of a total of nine chassis for the sound section. Of these, the seven central chassis 2 have the same size and shape, and each chassis 2 includes one octave key 3, that is, seven white keys 3a and five black keys 3b. A total of twelve keys 3 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 device 1 includes a total of 88 keys 3 (only two octaves are shown in FIG. 1).
[0013]
Each of the seven chassis 2 in the center is made of, for example, an ABS resin injection-molded product made of the same mold, and has a rectangular planar shape. Bosses 2a are formed at the four corners of the lower surface of the chassis 2 so as to protrude downward (only two front and rear parts are shown in FIG. 2). The front boss 2a has a reinforcing rib 2b extending rearward and a rear side boss 2a. Ribs 2b and 2b extending in the front-rear direction are integrally formed on the boss 2a.
[0014]
On the other hand, the chassis for the lowest sound part and the highest sound part are respectively formed by injection-molding a V-shaped grooved chassis by using a nested mold for the mold for the chassis 2, and the grooved chassis is grooved. It is manufactured by cutting along.
[0015]
Each of the front and rear connecting members 4 and 4 has a single long and narrow metal angle shape extending in the left-right direction of the chassis 2 and is made of, for example, an extruded product of an aluminum alloy. As shown in FIG. 2, the front connecting member 4 is composed of an upper horizontal chassis connecting portion 4a, a lower horizontal shelf fixing portion 4b, and a vertical portion 4c connecting the rear ends thereof. Yes. A plurality of bolt holes 4 d (only one is shown) are formed in the chassis connecting portion 4 a at positions corresponding to the bosses 2 a of the chassis 2. The front connecting member 4 is fixed to the chassis 2 by screwing screws 8 passed from below through the bolt holes 4d of the chassis connecting portion 4a into the front bosses 2a of the respective chassis 2, so that the chassis 2 is fixed. They are connected to each other (see FIG. 1).
[0016]
On the other hand, the rear connecting member 4 is formed symmetrically with the front connecting member 4, that is, is composed of an upper and lower horizontal chassis connecting portion 4 a and a shelf fixing portion 4 b and a vertical portion 4 c connecting the front ends thereof. Similarly to the front connecting member 4, the chassis 2 is connected to the boss 2 a on the rear side of each chassis 2 with screws 8 from below through the bolt holes 4 d of the chassis connecting portion 4 a.
[0017]
Each of the keys 3 (the white key 3a and the black key 3b) is made of, for example, an ABS resin injection-molded product, and the configuration thereof will be described below by taking the white key 3a as an example. A flexible portion 3e extending downward and an attachment portion 3f extending horizontally rearward from the flexible portion 3e are formed at the rear end portion of the white key 3a. The white key 3a is attached to the rear end portion of the upper surface of the chassis 2 with a screw 9 at the portion of the attachment portion 3f. Further, the flexible portion 3e has such a thickness that it can be elastically deformed and bent when the white key 3a is pressed. With this configuration, the white key 3a is centered on the mounting portion 3f. And after the key is released, it is returned and rotated in the key release direction (clockwise in FIG. 2) by the elastic force of the flexible portion 3e.
[0018]
A hook-like stopper portion 3c is formed at the front portion of the white key 3a, and this stopper portion 3c protrudes downward through the hole 2d of the chassis 2. 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 3a has a key release position (position shown in FIG. 2) in which the stopper portion 3c abuts the upper limit stopper 2f, and a key depression position where the lower surface of the white key 3a abuts the lower limit stopper 2e. It can rotate between positions (not shown), and is normally located at the key release position by the elastic force of the flexible portion 3e.
[0019]
Further, a key guide 2g is erected on the chassis 2 at a position corresponding to the stopper portion 3c of the white key 3a. The white key 3a is guided by the key guide 2g so as not to move in the left-right direction when rotating.
[0020]
The white key 3a is configured as described above, and although the description is omitted, the black key 3b is configured in substantially the same manner as the white key 3a.
[0021]
A key switch 13 for detecting key press information of the key 3 is provided at the center of the chassis 2. The key switch 13 includes a printed circuit board 14 and a large number of switch bodies 15 provided on the upper surface thereof. The printed circuit board 14 is attached to the chassis 2 with screws 10 with its front end engaged with the engagement groove 2 c of the chassis 2.
[0022]
Each switch body 15 protrudes above the chassis 2 through a hole 2h formed in the chassis 2 and is connected to a control device (not shown) for controlling the sound generation of the electronic piano through the printed circuit board 14. ing. On the other hand, an actuator portion 3 d that protrudes downward is formed at the center of the key 3, and this actuator portion 3 d is always in contact with the upper surface of the switch body 15. Then, as the key 3 is depressed, the actuator unit 3d depresses the switch body 15 to turn it on, thereby detecting key depression information such as the presence or absence of key depression and the key depression speed. The control device controls the sound generation of the electronic piano according to the detection result.
[0023]
In the keyboard device 1 having the above-described configuration, for example, a plurality of chassis 2 are connected to each other by the front and rear connecting members 4 and 5 as described above, and then the key switch 13 and the key 3 are connected to the connected chassis 2. After being assembled, and after adjusting the positional relationship between the chassis 2 and between the keys 3, they are attached to the shelf board 7 as the instrument body. The shelf board 7 is made of a wood material such as MDF or plywood.
[0024]
As shown in FIG. 2, the keyboard device 1 is attached to the shelf board 7 by bolt holes 7 a formed in the shelf board 7 and screw holes formed in the shelf board fixing portions 4 b of the front and rear connecting members 4 and 4. The screw 11 is passed through 4e from the lower side of the shelf board 7, and this screw 11 is screwed into the screw hole 4e of the shelf board fixing portion 4b.
[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, the manufacturing equipment including the mold for injection molding and the injection molding machine used for manufacturing the chassis 2 can be reduced in size. In addition, the mold can be easily adjusted at the trial production stage by downsizing the 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]
Further, since the plurality of chassis 2 are connected to each other by the connecting member 4, for example, before the chassis 2 is attached to the shelf plate 7, the key 3 can be attached to the plurality of chassis 2 connected by the connecting member 4. Thus, the degree of freedom in assembling the keyboard device 1 can be increased. As such, by assembling the keyboard device 1 outside the main body of the piano, for example, before being attached to the shelf board 7, the assembling work, and between the plurality of chassis 2 and between the keys 3 attached to them. Thus, it is possible to easily perform the adjustment work of the positional relationship, and it is possible to avoid damage to the surface of the key 3 that is likely to occur when the chassis 2, the key 3, and the like are sequentially incorporated in the shelf board 7.
[0027]
Furthermore, since the chassis 2 is fixed to the shelf board 7 with the screws 11 screwed into the metal connecting member 4 from the shelf board 7 side, a sufficient screw holding force can be ensured, while preventing problems such as screw stuffing, The keyboard device 1 can be firmly fixed to the shelf board 7. In addition, a separate mounting member conventionally provided for this purpose is not required, and the manufacturing cost can be further reduced by reducing the number of parts and the number of assembly steps.
[0028]
FIG. 3 shows an electronic piano keyboard apparatus according to a second embodiment of the present invention. The keyboard device 21 is of a type provided with a hammer 22 that rotates in conjunction with the key 3. The rear end of the key 3 is rotatably supported by the chassis 2. The hammer 22 is rotatably supported by a rotation fulcrum 23 of the chassis 2 at a portion on the front side of the central portion. The hammer 22 has a key contact portion 22a at the front end thereof in contact with the back surface of the top wall of the key 3, and a portion on the rear side of the rotation fulcrum 23 passes through the opening 2i of the chassis 2, It extends to the lower side of the chassis 2. Furthermore, an extending portion 22b extending upward is formed at the rear end portion of the hammer 22, and when the hammer 22 rotates, the extending portion 22b passes through the opening 2j formed in the chassis 2, Come and go.
[0029]
Further, an actuator portion 22 c is formed below the key contact portion 22 a of the hammer 22, and this actuator portion 22 c is always in contact with the upper surface of the switch body 15 of the key switch 13. Reference numerals 2k and 2l in the drawing are a lower limit stopper and an upper limit stopper provided on the upper surface of the shelf board 7 and the lower surface of the chassis 2 in order to regulate the lower limit position and the upper limit position of the hammer 22, respectively. With the above configuration, when the key 3 is depressed, the hammer 22 rotates counterclockwise in FIG. When the actuator unit 22c presses the switch body 15 of the key switch 13, key pressing information of the key 3 is detected.
[0030]
Also in the present embodiment, the chassis 2 is divided into nine chassis, and the plurality of chassis 2 includes front and rear connecting members 4 similar to the front connecting member 4 of the first embodiment described above. 4 are connected to each other and fixed to the shelf board 7 in the same manner as in the first embodiment. Further, in the present embodiment, a central connecting member 12 is provided in addition to the front and rear connecting members 4 and 4. The connecting member 12 includes an upper and lower horizontal chassis connecting portion 12a and a shelf fixing portion 12b, and a vertical portion 12c extending between the rear end of the former 12a and the front end of the latter 12b. The connecting member 12 is fixed to the chassis 2 by a screw 10 for fixing the key switch 13 through a bolt hole 12d formed in the chassis connecting portion 12a. The connecting member 12 is connected to each other and formed on the shelf fixing portion 12b. The screw 11 is fixed to the shelf 7 by screwing the screw 11 into the screw hole 12e from below through the bolt hole 7a of the shelf 7.
[0031]
Therefore, the keyboard device 21 of the present embodiment can achieve the same effect as that of the first embodiment, that is, the manufacturing cost of the keyboard device 21 can be greatly reduced by reducing the manufacturing cost of the chassis 2, and the assembly can be reduced. The degree of freedom is increased and the keyboard device 21 can be firmly fixed to the shelf board 7 via the connecting members 4 and 12.
[0032]
4 and 5 show an electronic piano keyboard apparatus according to a third embodiment of the present invention. Compared with the keyboard device 21 of the second embodiment, the keyboard device 31 is provided with a stopper portion 22d protruding rearward at the lower end portion of the extension portion 22b of the hammer 22 and the rear connecting member 24. It has a size larger than the rear connection member 4 of the second embodiment, and only the upper limit stopper 21 and the lower limit stopper 2k are respectively attached to the upper and lower chassis connection portions 24a and the shelf fixing portions 24b. Is different. According to this configuration, as shown in FIGS. 4 and 5, the rotation range of the hammer 22 is restricted by the stopper portion 22 c coming into contact with the lower limit stopper 2 k and the upper limit stopper 21.
[0033]
Therefore, the keyboard device 31 of the present embodiment can obtain the same effects as those of the first and second embodiments. Further, since the upper limit and lower limit stoppers 2l and 2k for restricting the rotation range of the hammer 22 are both attached to the rear connecting member 24, the second embodiment in which these are attached to the shelf board 7 and the chassis 2 separately. Unlike the above, the variation of the rotation stroke between the hammers 22 can be eliminated without being affected by the accuracy of attaching the keyboard device 31 to the shelf board 7 or the like.
[0034]
In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in each embodiment, the chassis is made of a synthetic resin and the shelf board is made of wood. However, the chassis and the shelf board may be made of other materials. The embodiment is an example in which the present invention is applied to an electronic piano. However, the present invention is not limited to this, and can be widely applied to other electronic musical instruments (such as a synthesizer), an acoustic piano, and the like. is there. In addition, the detailed configuration can be changed as appropriate within the scope of the gist of the present invention.
[0035]
【The invention's effect】
As described above in detail, the keyboard device of the keyboard instrument of the present invention can greatly reduce the manufacturing cost by greatly reducing the manufacturing cost of the chassis, can be easily assembled, and has a separate mounting member. It has the effect that it can be firmly fixed to the instrument body without needing it.
[Brief description of the drawings]
FIG. 1 is a plan view of a keyboard device for an electronic piano according to a first embodiment of the present invention, a part of which 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 an electronic piano according to a second embodiment of the present invention.
FIG. 4 is a side sectional view of a keyboard apparatus for an electronic piano according to a third embodiment of the present invention in a key release state.
FIG. 5 is a side sectional view of the keyboard device of FIG. 4 in a key-pressed state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Keyboard apparatus 2 Chassis 3 Key 4 Connection member 4a Chassis connection part 4b Shelf board fixing part 7 Shelf board 11 Screw 12 Connection member 12a Chassis connection part 12b Shelf board fixing part 21 Keyboard apparatus 24 Connection member 24a Chassis connection part 24b Shelf board fixation Part 31 Keyboard device

Claims (1)

A shelf board with bolt holes,
A plurality of chassis arranged in the left-right direction on the shelf board;
The plurality of chassis are arranged below the plurality of chassis in the front-rear direction and spaced apart from each other, extend in the left-right direction, and have an upper horizontal chassis connecting portion in which a bolt hole is formed, and a lower horizontal in which a screw hole is formed. And a plurality of the chassis connecting portions and the vertical portions connecting the shelf fixing portions, and screwing the screws through the bolt holes of the chassis connecting portions into the plurality of chassis. A front and rear metal connecting member fixed to the chassis and connecting the plurality of chassis to each other ;
A plurality of keys rotatably provided on the chassis;
Screws that pass through the bolt holes of the shelf plate from below and are screwed into the screw holes of the shelf plate fixing portion, thereby fixing the plurality of chassis to the shelf plate ,
A keyboard device for a keyboard instrument, comprising:

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