JP2000132170A - Rocking body support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a hammer by a hammer support part integrally formed on a resin-made keyboard chassis so as not to be separated in a keyboard device such as an electronic keyboard musical instrument such as electronic piano. SOLUTION: A hammer support part 23 integrally formed on a resin-made keyboard chassis 1 is formed of a pair of support plate parts 23a and a shaft part 23b formed between the support plate parts 23a. On the other hand, an elastic hook piece 77 having a tapered projection 77a is formed in a prescribed position of a hammer 71. Although the hammer 71 is slightly moved to the right when an excessive power for moving the hammer 71 to the right is added in the state where the mounting hole 73 of the hammer 71 is relatively fitted to the shaft part 23b through a guide hole 74, the projection 77a of the elastic hook piece 77 is brought into contact with the left surface of one support plate part 23a and locked, whereby the hammer 71 can be prevented from being separated from the shaft part 23b to the right.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator supporting structure, and more particularly to a structure of a hammer supporting portion formed integrally with a resin keyboard chassis in a keyboard device of an electronic keyboard instrument such as an electronic piano.

[0002]

2. Description of the Related Art For example, in a keyboard device of an electronic keyboard instrument such as an electronic piano, a keyboard chassis is formed of resin, and a key support portion, a hammer support portion and the like are integrally formed on the keyboard chassis. I have. FIG.
(A) and (B) show a hammer and a supporting portion thereof in such a keyboard device. A hammer support 102 is provided on the upper surface of the keyboard chassis 101 made of resin. The hammer support 102 is provided on the keyboard chassis 101.
A pair of support plate portions 103 formed on the upper surface of the
And a shaft portion 104 formed between these support plate portions 103
It consists of A predetermined portion of the keyboard chassis 101 below the shaft portion 104 is provided with a shaft portion 10 by molding.
A shaft portion forming hole 105 for forming the hole 4 is formed. On the other hand, the hammer 106 is a resin hammer body 10.
7 is provided. A circular mounting hole 108 and a tapered guide hole 109 connected to the mounting hole 108 are formed at a predetermined position of the hammer body 107. In this case, the minimum width of the guide hole 109 is slightly smaller than the diameter of the mounting hole 107, and the maximum width is slightly larger than the diameter of the mounting hole 107. And the mounting hole 107 is the guide hole 1
The hammer 106 is swingably supported by the hammer support portion 102 by being relatively fitted to the shaft portion 104 via 09.

[0003]

As described above, in this keyboard device, the mounting hole 107 is relatively fitted to the shaft portion 104 via the guide hole 109, so that the hammer 106 is provided.
Is swingably supported by the hammer support 102, so that the hammer 106 can be easily supported by the hammer support 102 with one touch. In this case, as described above, since the minimum width of the guide hole 109 is slightly smaller than the diameter of the mounting hole 107, the hammer 106 does not separate from the shaft portion 104 in a normal use state. However, when the electronic keyboard instrument provided with the keyboard device is inadvertently dropped during transportation or the like, there is a problem that the hammer 106 may be detached from the shaft 104. It is an object of the present invention to prevent a rocking body such as a hammer from coming off a shaft.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an oscillator supporting structure in which an oscillator is swingably supported by an oscillator supporting portion integrally formed with a resin chassis, wherein the oscillator supporting portion is provided. A pair of support plate portions formed opposite to the chassis, and a shaft portion formed between the support plate portions. When the mounting hole is relatively fitted to the shaft portion via the guide hole, the rocking body is prevented from being separated from the shaft portion by a separation preventing means. It is like that. According to the present invention, in a state where the mounting hole is relatively fitted to the shaft portion via the guide hole, the rocking member is prevented from being separated from the shaft portion by the separation preventing means. The moving body can be prevented from separating from the shaft.

[0005]

FIG. 1 is a plan view of a main part of a keyboard device according to an embodiment of the present invention, and FIG.
3 is a plan view of the keyboard chassis, and FIG. 4 is a cross-sectional view taken along line YY of FIG. This keyboard device includes a keyboard chassis 1 made of resin. Next, the keyboard chassis 1 will be described with reference to FIGS.

[0006] The keyboard chassis 1 has a first open front surface.
A channel 2 is provided. That is, the first channel-shaped portion 2 extends from an upper plate portion 2a, a rear plate portion 2b extending substantially downward from a rear end of the upper plate portion 2a, and a predetermined intermediate portion of the rear plate portion 2b. And a lower plate portion 2c. White key guides 3 are formed to extend upward at predetermined plural locations on the upper surface of the front end of the upper plate 2a. Lower plate 2
The rib plate 4 is formed at a plurality of predetermined positions below the rear plate portion 2b and the lower plate portion 2c below c.

[0007] Behind the first channel portion 2, a second channel portion 5 having an open upper surface is provided sharing the rear plate portion 2b of the first channel portion 2. That is, the second channel-shaped portion 5 includes a shared rear plate portion 2b, a lower plate portion 5a extending rearward from a lower end of the rear plate portion 2b,
A first intermediate plate portion 5b extending substantially upward from a rear end of the lower plate portion 5a; a second intermediate plate portion 5c extending rearward from an upper end portion of the first intermediate plate portion 5b; and a second intermediate plate portion The rear plate 5d extends substantially upward from the rear end of the rear plate 5c. Rib plates 6 are formed at a plurality of predetermined positions between the rear plate portion 2b, the lower plate portion 5a, and the first intermediate plate portion 5b so as to extend in the front-rear direction. At predetermined positions of the lower plate portion 5a, two bosses 7 each having an attachment hole to a not-shown bottom plate (instrument main body) are formed for each octave. Lower plate 5a and first
At the intersection with the intermediate plate 5b, the keyboard chassis 1 is
(Asahi Gas Injection) A gas channel 8 is formed when formed by molding (a method of injecting a resin and subsequently injecting a gas followed by molding).

[0008] Behind the second channel-shaped portion 5, there is provided a third channel-shaped portion 11 having an open lower surface, sharing the rear plate portion 5d of the second channel-shaped portion 5. That is, the third channel-like portion 11 is shared with the shared rear plate portion 5d,
An upper plate 11a extending rearward from the upper end of the rear plate 5d.
And a rear plate 11b extending substantially downward from the rear end of the upper plate 11a. Black key guides 12 are formed to extend upward at predetermined plural locations on the upper surface of the front end of the upper plate 11a. Black key stopper piece insertion holes 13 are formed in the rear plate 5d and the upper plate 11a on both left and right sides of the black key guide 12. Note that no rib plate is formed in the third channel-shaped portion 11. This allows the upper plate portion 11a to be elastically deformable, and changes the height position to some extent between the keyboard chassis 1 on the front side of the upper plate portion 11a and the keyboard chassis 1 on the rear side of the upper plate portion 11a. This is to easily cope with the need to perform this.

Behind the third channel-shaped portion 11, a third
A fourth channel-shaped portion 14 having an open upper surface is provided sharing the rear plate portion 11b of the channel-shaped portion 11.
That is, the fourth channel portion 14 is shared with the rear plate portion 1.
1b, a lower plate 14a extending obliquely rearward and upward from the lower end of the rear plate 11b, a first rear plate 14b extending substantially upward from the rear end of the lower plate 14a, and the first rear plate. Second rear plate portion 14c extending substantially downward from the lower end of portion 14b
It consists of The rear plate portion 11b, the lower plate portion 14a and the first
Rib plates 15 extend in the front-rear direction at a plurality of predetermined positions between the rear plate 14b and the rear plate 14b. At a plurality of predetermined locations on the lower plate portion 14a, key insertion detecting switch insertion holes 16 are formed. Circuit board supporting projections 17 are formed at a plurality of predetermined locations on the upper front surface of the second rear plate portion 14c.

[0010] Behind the fourth channel portion 14, the fourth
First and second rear plate portions 14b, 14 of the channel portion 14
5th channel-shaped part 2 which opened the lower surface, sharing c
1 is provided. That is, the fifth channel-shaped portion 2
1 is a shared first and second rear plate portion 14b, 14c, and an upper plate portion 21a extending rearward from the upper end of the first rear plate portion 14b.
A first rear plate 21b extending obliquely downward and rearward from the rear end of the upper plate 21a; and a second rear plate 21c extending substantially downward from the lower end of the first rear plate 21b. I have. First and second rear plate portions 14b, 14c and upper plate portion 21a
A plurality of rib plates 22 extend in the front-rear direction at a plurality of predetermined positions between the first and second rear plate portions 21b and 21c. Hammer support portions 23 are provided at a plurality of predetermined locations on the upper surface of the upper plate portion 21a. The hammer support 23 is
It comprises a pair of support plate portions 23a formed opposite to each other on the upper surface of the upper plate portion 21a, and a shaft portion 23b formed between these support plate portions 23a. A shaft portion forming hole 24 for forming the shaft portion 23b by die molding is formed at a predetermined position of the upper plate portion 15a below the shaft portion 23b.

A plate-like portion 25 is provided behind the fifth channel-like portion 21. That is, the plate-like portion 25 is
An inclined plate portion 25a extending obliquely rearward and upward from the upper end of the second rear plate portion 21c of the channel-shaped portion 21;
An upper plate portion 25b extending rearward from a rear end portion of the upper plate portion 5a, a projecting portion 25c formed on a lower surface of a front end portion of the upper plate portion 25b,
A rib portion 25 extending substantially upward from the rear end of the upper plate portion 25b
d and a rib 25e described later. At two or more predetermined positions of the inclined plate portion 25a, there are two holes 2 for inserting a hammer.
6 are formed. A gas channel 27 is formed in the projection 25c. Key support portions 28 are provided at a plurality of predetermined locations on the upper surface of the upper plate portion 25b. Key support 2
Reference numeral 8 denotes a pair of elastically deformable support plate portions 28a formed on the upper surface of the upper plate portion 25b so as to face each other, and shafts formed at predetermined positions on the opposing surfaces of the support plate portions 28a. And a portion 28b. A shaft portion forming hole 29 is formed at a predetermined position of the upper plate portion 25b below the shaft portion 28b. On the upper surface of the upper plate portion 25b on the front side of the key support portion 28, a coil spring mounting protrusion 30 is formed. On the upper surface of the upper plate portion 25b on the rear side of the key support portion 28, a rib portion 25e is formed extending to the rib portion 25d. As a result, the rib 25
A substantially T-shaped rib portion composed of e and a rib portion 25d in the vicinity thereof is formed.

A plurality of rib plates 31 are formed at a plurality of predetermined positions between the second rear plate portion 21c, the inclined plate portion 25a, and the upper plate portion 25b so as to extend in the front-rear direction. Predetermined two rib plates 31
A plate portion 32 is provided on the rear surface of the lower end portion of the second rear plate portion 21c between the two.
Are formed two for each octave.
Is formed with a boss 33 having a mounting hole for a bottom plate (instrument main body). A lower portion of the rear end of each rib plate 31 is formed with a sixth channel-shaped portion 34 whose lower surface is open. Notches 35 for arranging the upper limit stopper member for the hammer are formed in all the rib plates 31 on the front side of the sixth channel portion 34. At predetermined positions on the rear surface of the sixth channel portion 34, two bosses 36 each having an attachment hole to a bottom plate (instrument main body) are formed for each octave. The bosses for attaching the keyboard chassis 1 to the bottom plate (instrument body) may be only the front and rear bosses 7 and 36, and the intermediate boss 33 may be omitted.

Next, a description will be given with reference to FIG. Greases 41 and 42 are applied to the key guides 3 and 12, respectively. A not-shown white key light emitting diode (light emitting element) is provided at a predetermined position on the upper surface of the upper plate portion 2a of the first channel-shaped portion 2.
Is attached. A band-shaped upper limit stopper member 44 for white key made of felt or the like is attached to the lower surface of the upper plate portion 2a of the first channel-shaped portion 2. A band-shaped white key lower limit stopper member 45 made of felt or the like is attached to the upper surface of the lower plate portion 2c of the first channel-shaped portion 2.

The second intermediate plate 5c of the second channel 5
A belt-like lower limit stopper member 46 for black key made of felt or the like is attached to the upper surface of the lower plate. A band-shaped black key upper limit stopper member 47 made of felt or the like is attached to the lower surface of the upper plate portion 11a of the third channel-shaped portion 11.
A circuit board 48 provided with a black key light emitting diode (not shown) is attached to a predetermined position on the upper surface of the upper plate portion 11a of the third channel-shaped portion 11.

On the lower surface of the lower plate portion 14a of the fourth channel portion 14, there is provided a circuit board 52 provided with a keying detection switch 51 formed of a push button type self-returning rubber switch on the upper surface. The circuit board 52 has its rear end supported by the circuit board supporting projections 17, and a plurality of predetermined portions thereof are attached to the lower plate portion 14 a by screws 53. The keying detection switch 51 protrudes above the lower plate portion 14a through the keying detection switch insertion fool hole 16. Here, the angle of inclination of the lower plate portion 14a will be described. An extension of the lower plate portion 14a substantially passes through the shaft portion 28b of the key support portion 28. When the lower surface of the switch pressing portion 65 of the white key 61 described later is not a predetermined inclined surface but a substantially horizontal surface, the lower plate portion 14a may be substantially horizontal.

A belt-like lower limit stopper member 54 for hammer made of felt or the like is attached to the lower surface of the rear end of the upper plate portion 25b of the plate portion 25. Sixth channel 34
The rear upper surface of the hard film 55 is attached to the lower surface of the hard film 55. A band-shaped hammer upper limit stopper member 56 made of felt or the like is attached to the front upper surface of the hard film 55 in the cutout portion 35.

On the upper side of the keyboard chassis 1, a plurality of resin keys (see FIG. 1, white key 61 and black key 62, but mainly the white key 61 will be described) are arranged in parallel. The white key 61 has a substantially L-shaped stopper piece 64 formed below a front end portion of a key body 63 having a substantially inverted U-shaped cross section, and a switch pressing portion 65 having a predetermined shape is formed below a central portion of the key body 63.
Are formed, a coil spring mounting protrusion 66 is formed on the lower rear side of the key body 63, and mounting holes 67 are formed on both sides of the rear end of the key body 63. Then, the rear end of the key body 63 is press-fitted between a pair of elastically deformable support plates 28a of the key support 28 (see FIG. 1), and the respective mounting holes 67 are relatively fitted to the shaft 28b. As a result, the white key 61 is swingably disposed above the keyboard chassis 1. A coil spring 68 is mounted between the two coil spring mounting protrusions 30 and 66. The substantially L-shaped stopper piece 69 of the black key 62
Is vertically movably inserted into the black key stopper piece insertion hole 13 (see FIG. 3).

A hammer 71 is arranged below the white key 61 from the center to the rear. The hammer 71
A circular mounting hole 73 and a tapered guide hole 74 connected to the mounting hole 73 are formed at a predetermined location of the resin hammer main body 72, and a weight made of lead or the like is provided at another predetermined location of the hammer main body 72. 75, and a soft contact portion 76 made of urethane resin or the like is provided at the front end of the hammer main body 72 (an elastic hook piece 77 is formed near the guide hole 74. But this will be explained later.) In this case, the minimum width of the guide hole 74 is slightly smaller than the diameter of the mounting hole 73, and the maximum width is slightly larger than the diameter of the mounting hole 73. Then, the hammer main body 72 is provided with
6, the mounting hole 73 is relatively fitted to the shaft 23 b of the hammer support 23 through the guide hole 74, so that the hammer 71 swings below the white key 61. It is arranged as possible. The soft contact portion 76 made of urethane resin or the like is for preventing generation of noise at the time of keying. The contact portion 76 is provided between the upper plate portion of the key body 63 of the white key 61 and a predetermined portion 65 of the switch pressing portion 65.
a so as to be rotatable.

Next, the hammer 71 and the hammer support 2
The first example of No. 3 will be described with reference to FIGS. In this case, the guide hole 74 is provided in the mounting hole 73 in FIG.
It is formed on the left side in FIG. An elastic hook piece 77 is formed in a cantilever shape on the left side of the hammer body 72 above the guide hole 74 in FIG. 5A. A tapered projection 77a is formed on the outer surface of the distal end portion of the elastic hook piece 77.

Now, in this first example, the hammer 7
When attaching 1 to the shaft portion 23b, when the hammer 71 is moved from right to left in FIG. 5A, the mounting hole 73 is relatively fitted to the shaft portion 23b via the guide hole 74. At this time, the elastic hook piece 77 is
Is appropriately elastically deformed by contacting the inner surface of one of the support plate portions 23a, and then the protrusion 77a is
By elastically returning to the original state by protruding to the left in FIG. In this state, if an excessive force is applied to move the hammer 71 rightward in FIG. 5A, the hammer 71 slightly moves rightward.
The projection 77a of the elastic hook piece 77 is connected to the one support plate 23a
5B, the hammer 71 can be prevented from falling off to the right from the shaft portion 23b. FIG. 6 shows a swinging state of the hammer 71.

Next, the hammer 71 and the hammer support 2
The second example of No. 3 will be described with reference to FIGS. In this case, the guide hole 74 is formed below the mounting hole 73. Then, the guide hole 74 shown in FIG.
An elastic hook piece 77 is cantilevered below the hammer main body 72 on the left side in FIG. A tapered projection 77a is formed on the outer surface of the distal end portion of the elastic hook piece 77.

Now, in this second example, the hammer 7
When the hammer 71 is moved from the upper side to the lower side, the mounting hole 73 is attached to the shaft portion 23b.
4 and is relatively fitted to the shaft portion 23b. At this time, the projection 77a of the elastic hook piece 77 is
After being appropriately elastically deformed by contacting the hole wall surface of No. 4, the projection 77 a is elastically returned to the original state by projecting below the shaft portion forming hole 24. In this state, when an unreasonable force is applied to move the hammer 71 upward, the hammer 71 slightly moves upward, but the projection 77a of the elastic hook piece 77 is moved by the hole wall of the shaft portion forming hole 24. The lower surface of the hammer 7
1 can be prevented from detaching upward from the shaft portion 23b. FIG. 8 shows the swinging state of the hammer 71.

Next, the hammer 71 and the hammer support 2
A third example of No. 3 will be described with reference to FIG. In this case, the guide hole 74 is formed on the left side of the mounting hole 73 in FIG. A groove 81 having a substantially U-shaped cross section is formed at a predetermined location on the outer peripheral surface of the shaft portion 23b, and a projection 82 having a triangular cross section is formed at a predetermined location inside the mounting hole 73. In this case, the inclination of the projection 82 on the left side in FIG. 9 is gentle and the inclination on the right side is severe.

Now, in the third example, the hammer 7
When the hammer 71 is moved from the right side to the left side in FIG.
Are relatively fitted to the shaft portion 23b via the guide holes 74, and the projections 82 enter the grooves 81. In this state, the right surface of the protrusion 82 in FIG. 9 contacts the right wall surface of the groove 81 in FIG. 9 to prevent the protrusion 82 from coming off, so that the hammer 71 can be prevented from separating from the shaft portion 23b in the right direction. FIG. 10 shows a swinging state of the hammer 71.

Next, the hammer 71 and the hammer support 2
A fourth example of No. 3 will be described with reference to FIG. In this case, the guide hole 74 is formed on the left side of the mounting hole 73 in FIG. A protrusion 83 having a triangular cross section is formed at a predetermined location on the outer peripheral surface of the shaft portion 23b, and a groove 8 having a substantially U-shaped cross section is formed at a predetermined location in the upper part of the mounting hole 73.
4 are formed. In this case, the inclination of the projection 83 on the right side in FIG. 11 is gentle and the inclination on the left side is severe.

In the fourth example, the hammer 7
When the hammer 71 is moved from the right side to the left side in FIG.
3 is relatively fitted to the shaft portion 23 b via the guide hole 74, and the projection 83 relatively enters into the groove 84. In this state, the left surface of the projection 83 in FIG. 11 contacts the left wall surface of the groove 84 in FIG. 11 and is prevented from falling out, so that the hammer 71 can be prevented from separating from the shaft portion 23b rightward. FIG. 12 shows a swinging state of the hammer 71.

Next, the hammer 71 and the hammer support 2
A fifth example 3 will be described with reference to FIG. In this case, the guide hole 74 is formed below the substantially semicircular attachment hole 73 symmetrically in FIG. The upper half of the shaft portion 23b has a large diameter portion, and the lower half has a small diameter portion. In this case, the minimum width of the guide hole 74 is substantially the same as the diameter of the small diameter portion in the lower half of the shaft portion 23b.

Now, in the fifth example, the hammer 7
When the hammer 71 is moved from the upper side to the lower side, the mounting hole 73 is attached to the shaft portion 23b.
4 and the upper half of the shaft portion 23b is relatively fitted to the large diameter portion of the shaft portion 23b.
3b is arranged around the small diameter portion of the lower half. In this state, the step between the minimum width portion of the guide hole 74 and the mounting hole 73 comes into contact with the step between the upper half large-diameter portion and the lower half small-diameter portion of the shaft portion 23b and is prevented from coming off. This can prevent the hammer 71 from detaching upward from the shaft portion 23b. FIG. 14 shows a swinging state of the hammer 71.

[0029]

As described above, according to the present invention, when the mounting hole is relatively fitted to the shaft portion via the guide hole, the rocking member is prevented from coming off from the shaft portion. Since this is prevented by the means, it is possible to prevent the rocking body from coming off the shaft.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a keyboard device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1;

FIG. 3 is a plan view of the keyboard chassis shown in FIG. 1;

FIG. 4 is a sectional view taken along the line YY of FIG. 3;

FIG. 5A is a longitudinal side view of a first example of a hammer and a hammer support, and FIG. 5B is a cross-sectional view taken along line BB.

FIG. 6 is a vertical sectional side view showing a swinging state of the hammer shown in FIG. 5;

FIG. 7A is a vertical sectional side view of a second example of the hammer and the hammer support, and FIG. 7B is a cross-sectional view taken along the line BB.

FIG. 8 is a longitudinal side view showing a swinging state of the hammer shown in FIG. 7;

FIG. 9 is a longitudinal sectional side view of a third example of the hammer and the hammer support.

10 is a vertical sectional side view showing a swinging state of the hammer shown in FIG. 9;

FIG. 11 is a vertical sectional side view of a fourth example of the hammer and the hammer support.

FIG. 12 is a longitudinal sectional side view showing a swinging state of the hammer shown in FIG. 11;

FIG. 13 is a vertical sectional side view of a fifth example of the hammer and the hammer support.

FIG. 14 is a longitudinal sectional side view showing a swinging state of the hammer shown in FIG. 13;

FIG. 15A is a vertical side view of a conventional hammer and a hammer supporting portion, and FIG. 15B is a cross-sectional view taken along the line BB.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard chassis 23 Hammer support 23a Support plate 23b Shaft 24 Shaft forming hole 71 Hammer 72 Hammer body 73 Mounting hole 74 Guide hole 77 Elastic hook piece

Claims (5)

[Claims] 1. An oscillator supporting structure in which an oscillator is swingably supported by an oscillator supporting portion integrally formed with a resin chassis, wherein the oscillator supporting portion is opposed to the chassis. A pair of support plate portions formed by the above, and a shaft portion formed between these support plate portions, the rocking body includes a mounting hole, a guide hole continuous with the mounting hole, the shaft In a state in which the mounting hole is relatively fitted to the portion via the guide hole, the rocking body is prevented from being separated from the shaft portion by a separation preventing means. Oscillator support structure. 2. The invention according to claim 1, wherein the detachment preventing means includes an elastic hook piece formed near a guide hole of the oscillating body, and the elastic hook piece is prevented from coming off by the support plate portion. Oscillator supporting structure, characterized in that 3. The invention according to claim 1, wherein the detachment preventing means includes an elastic hook piece formed near a guide hole of the oscillating body, and the elastic hook piece forms the shaft portion. The rocking body support structure, wherein the rocking body is prevented from falling off by a hole wall of a shaft forming hole formed in the chassis. 4. An oscillator supporting structure according to claim 1, wherein said detachment preventing means is constituted by a correlation between a cross-sectional shape of said shaft portion and a shape of said mounting hole. 5. The invention according to claim 1, wherein the chassis is a keyboard chassis, the oscillator support is a hammer support, and the oscillator is a hammer. Oscillator support structure.