JP2547150Y2 - Keyboard device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a keyboard device for a keyboard instrument such as an electronic piano.

[Prior art and its problems] In a keyboard instrument such as an electronic piano, a hammer arm having a predetermined weight below a key is provided in order to obtain a key touch feeling similar to that of an acoustic piano. Are provided so as to be rotatable in the vertical direction, and a predetermined action load is applied to the key by rotating the hammer arm against its own weight with the key pressing operation of the key. .

In such a conventional keyboard instrument, a hammer arm is rotatably attached to a keyboard chassis which rotatably supports a key, and a hammer position regulating member for regulating an initial position of the rotatable hammer arm is provided on the keyboard. Attached to the chassis.

However, such a conventional keyboard instrument requires a shaft for rotatably supporting the hammer arm, a support for supporting both ends of the shaft, and a screw for attaching the support to the keyboard chassis. In addition, a hammer position regulating member and a means for attaching the hammer position regulating member to the keyboard chassis are required, so that the number of parts is considerably large, and the work of assembling these parts is considerably troublesome, and the cost is considerably increased. There was a problem of doing it.

[Purpose of the invention] This invention was made in view of the circumstances described above.
It is an object of the present invention to provide a keyboard device capable of reducing the number of parts and facilitating an assembling operation.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a key rotatably supported on a keyboard chassis, a sliding contact surface provided on the keyboard chassis, and a rotatable end at one end of the key. And a hammer arm that slides on the sliding surface when the key is turned, and when the key is turned,
The key point is that the hammer arm is slid on the sliding contact surface and a predetermined force is applied to the key from the hammer arm.

[Examples] Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 1 shows a main part of an electronic keyboard instrument to which the first embodiment of the present invention is applied.

In this embodiment, the key 11 is rotatably supported by the keyboard chassis 1, the horizontal upper surface 45 which is a sliding contact surface provided on the keyboard chassis 1, and is rotatably supported at one end of the key 11. And a hammer arm 41 that slides on the upper surface 45 when the key 11 rotates.When the key 11 rotates, the hammer arm 41 slides on the upper surface 45, and the hammer arm 41 A predetermined force is applied.

 Hereinafter, details of such a configuration will be described.

This electronic keyboard instrument includes a keyboard chassis 1 made of synthetic resin (or sheet metal). The keyboard chassis 1
The left rear chassis portion 3 is higher than the right front chassis portion 2 in the drawing, and a vertical middle chassis portion 4 is provided therebetween, and the rear chassis portion 3 is slightly raised so as to gradually increase from the front side to the rear side. It has an inclined structure.
In the keyboard chassis 1, when incorporated in a portable musical instrument body case (not shown), a space of a certain size is formed below the rear chassis portion 3 as compared to below the front chassis portion 2. The dry battery storage part 5 is constituted by a part thereof.

On the upper surface side of the keyboard chassis 1, a plurality of keys made of synthetic resin (white keys and black keys, but only white keys will be described).
11 are arranged in parallel. The key 11 has a projection 12 formed on the rear end portion thereof, and is mounted on the upper surface of a band-shaped buffer member 13 made of non-woven fabric or the like provided on the rear upper surface of the rear chassis portion 3 of the keyboard chassis 1. A mounting portion 15 having a substantially U-shaped cross section formed through a thin elastically deformable hinge portion 14 at the rear portion of the portion 12 is attached to the rear upper surface portion of the rear chassis portion 3 of the keyboard chassis 1 by a screw 16, and The elastic deformation of the portion 14 allows the portion 14 to rotate in the up-down direction. The portion of the key 11 on the front side of the protrusion 12 is an upper plate 17 and two side plates 18 (second
(See the figure) and the front plate 19.

The key 11 is urged upward by the elastic restoring force of the hinge portion 14, but usually, as shown by a solid line in FIG.
A stopper piece 21 projecting below the front part of the upper plate 17 and both side plates 18 and having a substantially H-shaped cross section and a substantially L-shaped tip is formed in a stupid hole 22 formed in the middle chassis portion 4 of the keyboard chassis 1. The keyboard chassis 1 is positioned at a predetermined initial position (upper limit position) by coming into contact with a belt-like upper stopper member 23 made of rubber or the like provided on the upper surface of the middle chassis portion 4 of the keyboard chassis 1.

The lower surface of the front plate 19 of the key 11 abuts on the upper surface of the front chassis portion 2 of the keyboard chassis 1 below the front plate 19 of the key 11 and is made of rubber or the like for regulating the lower limit position of the key 11. A band-shaped lower limit stopper member 24 is provided. On the upper surface of the front chassis portion 2 of the keyboard chassis 1 at the rear side of the lower limit stopper member 24, a key guide portion for preventing lateral swing of the key 11 and guiding up and down movement of the key 11 is provided.
25 are provided. On the upper surface of the rear chassis portion 3 of the keyboard chassis 1 below the center portion of the side plate 18 of the key 11, a band made of rubber or the like for preventing generation of abnormal noise due to contact of the lower end of the center portion of the side plate 18 of the key 11 is formed. Is provided.

First and second switch pressing projections 31 and 32 having a substantially cross-shaped cross section project downward at two predetermined locations on the lower surface of the central portion of the upper plate 17 of the key 11. First and second rubber switches 33 and 34 are arranged below the first and second switch pressing projections 31 and 32, respectively. The first and second rubber switches 33 and 34 are provided on the upper surface of a circuit board 35 disposed on the lower surface side of the rear chassis portion 3 of the keyboard chassis 1, and are provided on the rear chassis portion 3 of the keyboard chassis 1. The keyboard chassis 1 protrudes above the rear chassis portion 3 through the holes 36 and 37. The circuit board 35 has one end supported by a substantially L-shaped support portion 38 formed on the lower surface of the rear chassis 3 of the keyboard chassis 1 and the other end formed on the lower surface of the rear chassis 3 of the keyboard chassis 1. The supporting member 39 is supported by the free end of the substantially U-shaped elastic supporting member 39.

In the internal space of the key 11 between the front plate 19 of the key 11 and the stopper piece 21, a hammer arm 41 is arranged. The hammer arm 41 is formed of iron or the like, has a shaft portion 42 (see FIG. 2) on both sides of the front portion, and has a sliding contact protrusion 43 (third end) having a substantially semicircular cross section at a predetermined lower portion. (See figure)
Is provided. The hammer arm 41
With the rear portion positioned near the stopper piece 21 of the key 11, the two shaft portions 42 are fixed to the inner surfaces of the both side plates 18 at the front end portion of the key 11, as shown in FIG. It is press-fitted from below the key 11 into the bearing recessed portion 44 formed at the location, and is rotatably mounted.

The hammer arm 41 is biased counterclockwise in FIG. 1 around the shaft portion 42 by its own weight, but is normally shown by a solid line in FIG. 1 and as shown in FIG. The sliding contact projection 43 contacts the horizontal upper surface 45 of the front chassis portion 2 of the keyboard chassis 1 so as to be positioned at a predetermined initial position.

 Next, the operation of the electronic keyboard instrument will be described.

When the key 11 is pressed against the elastic force of the hinge 14 and the weight of the hammer arm 41, the key 11 is displaced clockwise in FIG. 1 while bending the hinge 14. Then, the shaft portion 42 of the hammer arm 41 is displaced downward together with the side plate 18 of the key 11, so that the hammer arm 41 is slid against the weight of the hammer arm 41 and the protrusion 43 for sliding contact is formed on the horizontal upper surface of the front chassis portion 2. 45 while sliding it to the left in FIG.
As shown by a dashed line in the figure, it is displaced clockwise about the sliding contact projection 43. At this time, the resistance of the hammer arm 41 urged in the counterclockwise direction in FIG.
Acts as an action load on the side plate 18.

Therefore, a predetermined action load due to the resistance of the hammer arm 41 is applied to the key 11 to be pressed, giving the player a feeling that the key 11 is heavy. Thus, with this electronic keyboard instrument, a key touch feeling similar to that of an acoustic piano can be obtained. Such key touch feeling will be described later in more detail.

On the other hand, when the first and second switch pressing projections 31 and 32 that rotate and displace integrally with the key 11 respectively press the first and second rubber switches 33 and 34 as shown by the dashed line in FIG. , And the first and second rubber switches 33 and 34 are sequentially switched with a time difference t corresponding to the key pressing speed of the key 11. Then, by switching the second rubber switch 34, key-on data for instructing a tone generator (not shown) to start generating a musical tone is obtained.
Data relating to the key pressing speed, that is, initial touch data for initially controlling the tone characteristics such as the volume and tone of the tone, is obtained.

When the key pressing operation on the key 11 is released, the key 11 is displaced upward in the counterclockwise direction in FIG. 1 by the elastic restoring force of the hinge portion 14, and the stopper piece 21 contacts the upper limit stopper member 23. As a result, it is returned to the original initial position indicated by the solid line in FIG. Along with this, the side plate of the key 11
When the shaft portion 42 of the hammer arm 41 is displaced upward together with 18, the hammer arm 41 is brought into contact with the sliding contact projection by its own weight.
43 slides rightward in FIG. 1 on the horizontal upper surface 45 of the front chassis portion 2 while rotating counterclockwise about the sliding contact projection 43 to return to the original initial position indicated by the solid line. Will be returned.

Thus, in this electronic keyboard instrument, the hammer arm
As shown in FIG. 2, the two shaft portions 42 of the
Since it is rotatably mounted in the bearing recess 44, a dedicated shaft or the like for rotatably supporting the hammer arm 41 is not required, and the number of parts is reduced correspondingly, thereby reducing costs. be able to. Also, hammer arm 41
When the shaft portion 42 of the key 11 is attached to the bearing recessed portion 44 of the both side plates 18 of the key 11, it is only necessary to press-fit the key 11 from underneath, so that the assembling operation of the hammer arm 41 to the key 11 can be easily performed. .

Also, in this electronic keyboard instrument, since the sliding contact projection 43 of the hammer arm 41 is brought into sliding contact with the horizontal upper surface 45 of the front chassis portion 2 of the keyboard chassis 1, it rotates with the key 11 releasing operation. The return limit position of the returning hammer arm 41 in the same direction can be restricted by the sliding contact projection 43 abutting on the horizontal upper surface 45 of the front chassis portion 2, and as a result, the front chassis portion 2 of the keyboard chassis 1 can be restricted. Hammer arm 41 on horizontal top surface 45
Can be provided with a function of regulating the initial position of the camera. Therefore, a dedicated hammer position regulating member for regulating the initial position of the rotatable hammer arm 41 is not required, and the number of parts is further reduced by that amount, and the cost can be further reduced. Also, since there is no need to attach a dedicated hammer position regulating member, the work of assembling parts is further facilitated.

Furthermore, in this electronic keyboard instrument, the hammer arm 41
Is rotatably provided in the internal space of the key 11 between the front plate 19 of the key 11 and the stopper piece 21, so that the keyboard chassis 1
Even when the dry cell storage section 5 is constituted by a part of a space of a certain size formed below the rear chassis section 3, the dry cell storage section 5 and the hammer arm 41 do not overlap with each other. The thickness of the entire musical instrument can be reduced as compared with the case where the dry battery storage section 5 is provided below the instrument.

Here, the key touch feeling (key load) of the electronic keyboard instrument will be described in detail. First, when the key 11 is depressed with a weak depressing force, at the initial stage of depressing the key 11, the elastic force of the hinge portion 14 of the key 11 and the hammer arm 41 as shown by the symbol A in FIG. A load composed of the sum of the resistance and the key acts on the key 11. When the key 11 is further displaced downward and reaches the time point indicated by the symbol B in FIG. 4, the first and second switch pressing projections 3
1 and 32 start pressing the first and second rubber switches 33 and 34. Then, as shown by reference numeral C in FIG. 4, a load composed of the elastic resistance of the first and second rubber switches 33 and 34 acts on the key 11. Then, in FIG.
At the time point indicated by, the rubber switch 33 in FIG. 1 buckles and turns on, and then at the time point indicated by reference symbol E in FIG. 4, the second rubber switch buckles and turns on. As a result, the key-on data and the initial touch data are transmitted to the sound source unit, and as a result, a musical tone having a volume, tone, or the like corresponding to the initial touch data at this time is generated. Next, when the key 11 is further displaced downwardly and reaches the time point indicated by the symbol F in FIG.

Next, when the key 11 is depressed with a somewhat strong depressing force, as shown by a symbol G in FIG. The acting load increases rapidly. The key 11 is further displaced downward and the fifth
At the point indicated by the symbol H in the figure, the hammer arm
Due to the relatively large inertial force of the clockwise rotation of 41 in FIG. 1, its sliding contact projection 43 is separated from the horizontal upper surface 45 of the front chassis part 2, and therefore, as shown by the symbol K in FIG. 5. In addition, the load formed by the resistance of the hammer arm 41 does not act on the key 11, which gives the player a feeling that the key 11 is suddenly lightened.

Next, as shown in FIG. 6, when the key 11 is depressed with a strong depressing force, the key 11 acts on the key 11 in the initial stage of depressing the key as compared with the case of FIG. The load is further increased, and the time point indicated by the symbol H is earlier.

In the first embodiment, the upper surface 45 of the front chassis portion 2 of the keyboard chassis 1 for regulating the position of the hammer arm 41 is merely a horizontal surface, but the present invention is not limited to this.

For example, as in the second embodiment shown in FIG. 7, the front chassis portion 2 on the left side of the sliding contact projection 43 of the hammer arm 41 is provided.
A click feeling imparting projection 51 having a substantially semicircular cross section is provided on the horizontal upper surface 45 of the
Even when the sliding contact projection 43 slides on the horizontal upper surface 45 of the front chassis portion 2 to the left in FIG. Good.

In such a configuration, for example, when the key 11 is depressed with a weak depressing force, the second rubber switch 34 buckles and is turned on compared to the case of FIG. At the point indicated by reference numeral E, as shown by reference numeral L in FIG. 8, a load due to the resistance generated when the sliding contact projection 43 of the hammer arm 41 rides on the click feeling imparting projection 51 acts on the key 11. When the sliding contact projection 43 gets over the click feeling imparting projection 51, the load due to the resistance generated at this time does not act on the key 11. Therefore, in this case, after the second rubber switch 34 is turned on, the load acting on the key 11 becomes slightly larger, and then the key 11
The load acting on 11 becomes slightly smaller.

It should be noted that a click feeling imparting concave portion 52 having a substantially semicircular cross section is provided on the horizontal upper surface 45 of the front chassis part 2 instead of the click feeling imparting projection 51, as in the third embodiment shown in FIG. When the hammer arm 41 is rotated and displaced by the key depression operation of 11, the sliding contact projection 43 slides on the horizontal upper surface 45 of the front chassis portion 2 to the left in FIG. You may comprise so that it may go out after it enters into the recessed part 52.

In such a configuration, for example, when the key 11 is depressed with a weak depressing force, the second rubber switch 34 buckles and is turned on compared to the case of FIG. At the time point indicated by the symbol E, for example, the symbol M in FIG.
As shown by, the sliding contact projection 43 of the hammer arm 41 enters the click feeling imparting concave portion 52, so that the load acting on the key 11 is slightly reduced, and then the sliding contact projection 43 is moved to the click feeling imparting concave portion 52. As a result, the load acting on the key 11 is slightly increased.

The cross-sectional shape of the click feeling imparting projection 51 or the click feeling imparting concave portion 52 is not limited to a substantially semicircular shape. For example, as shown in FIG. 10, the cross-sectional shape of the click feeling imparting projection 51 may be a cross-sectional shape including an arc surface on the left side in the same figure and an inclined surface on the right side that descends somewhat gently from the upper part of the arc surface. Good. in this way,
Click feeling boss 51 or click feeling dent
By appropriately selecting the cross-sectional shape of the key 52, the click feeling given to the key 11 can be slightly changed.

In the first embodiment, the switch chassis 1 is provided with the switch pressing projections 31 and 32 provided on the lower surface of the central part of the upper plate 17 of the key 11.
A rubber switch 33 protruding above the rear chassis part 3,
34 are pressed, but the present invention is not limited to this.

For example, it may be configured as in the fourth embodiment shown in FIG. That is, the rear part of the hammer arm 41 is extended rearward, and the extended part is the stupid hole 22 of the middle chassis part 4.
The switch pressing portion 61 is formed by the upper surface of a portion located below the rear chassis portion 3 through the rear chassis portion 3 and located below the rear chassis portion 3. In this case, the contact surface 62 is constituted by the lower surface of the portion of the hammer arm 41 located on the right side in FIG. 11 of the fool hole 22 of the middle chassis portion 4, and a black (not shown) provided on the rear upper surface of the front chassis portion 2. When the contact surface 62 contacts the lower limit stopper member 63 for the key, the hammer arm 41 returns to the initial position.
Brakes.

On the other hand, a circuit board 35 is attached to the upper surface of the rear chassis portion 3 of the keyboard chassis 1 with screws 64.
Rubber switches 33 and 34 are provided on the lower surface of 35. These rubber switches 33, 34 project below the rear chassis portion 3 of the keyboard chassis 1 through stupid holes 36, 37 formed in the rear chassis portion 3 of the keyboard chassis 1. It is designed to face 61. In this case, an upper limit stopper member 21 is integrally formed on the lower surface of one end portion of the common base sheet 65 of the rubber switches 33 and 34, and the integrally formed upper limit stopper member 21 is formed by a fool hole 66 formed in the rear chassis portion 3. Through the rear chassis 3.

In such a configuration, when the hammer arm 41 is rotated and displaced clockwise in FIG. 11 with the key depressing operation of the key 11, the switch pressing portion 61 of the hammer arm 41 presses the rubber switches 33 and 34. After being turned on, the hammer arm 41 is brought into contact with the upper limit stopper member 21 so that the rubber switches 33 and 34 (musical sound generation start instructing means) can be timely synchronized with the rotational displacement of the hammer arm 41. Can be operated to generate a desired musical sound. Also, a switch pressing protrusion having a substantially cross-shaped cross section is provided on the key 11.
There is no need to form the keys 31 and 32, the die for injection molding of the key 11 does not have a complicated shape, and the key 11 can be manufactured at low cost.

Even in the case of the structure shown in FIG. 11, it is a matter of course that a click feeling imparting projection or a click feeling imparting concave portion may be provided on the horizontal upper surface 45 of the front chassis part 2 of the keyboard chassis 1.

[Effects of the Invention] As described above, according to the invention, the hammer arm is rotatably supported at one end of the key, and slides on the sliding contact surface provided on the keyboard chassis, and the key of the key is moved. When rotating, the hammer arm slides on the sliding contact surface, and a predetermined force is applied to the key from this hammer arm, so there is no need for a dedicated shaft for rotatably supporting the hammer arm. Also, there is no need for a dedicated hammer position regulating member for regulating the initial position of the rotatable hammer arm, so that the number of parts is reduced by that much, assembling work becomes easy, and cost is reduced. Reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a main part of an electronic keyboard instrument to which the first embodiment of the present invention is applied, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line III-III of FIG. 3, FIG. 4 to FIG. 6 are diagrams for explaining key loads in the electronic keyboard instrument, and FIG. 7 is an electronic keyboard to which the second embodiment of the present invention is applied. FIG. 8 is a view for explaining a key load in the second embodiment, and FIG. 9 is a main part of an electronic keyboard instrument to which the third embodiment of the present invention is applied. FIG. 10 is a longitudinal side view showing a main part of an electronic keyboard instrument to which the fourth embodiment of the present invention is applied, and FIG. 11 is a vertical side view of an electronic keyboard instrument to which a fifth embodiment of the present invention is applied. It is a vertical side view which shows a principal part. 1 ... keyboard chassis, 11 ... keys, 33, 34 ... rubber switches (musical sound generation start instructing means), 41 ... hammer arms,
42: Shaft of hammer arm, 43: Projection for sliding contact of hammer arm, 45: Horizontal upper surface of keyboard chassis, 51 ...
Click feeling projection, 52 ... click feeling depression,
61 ... Switch pressing part of hammer arm.

Claims (4)

(57) [Scope of request for utility model registration] A key rotatably supported by a keyboard chassis; a sliding surface provided on the keyboard chassis; a key rotatably supported at one end of the key; A hammer arm that slides on the sliding contact surface when moving, when the key is rotated, the hammer arm slides on the sliding contact surface, and a predetermined force is applied to the key from the hammer arm. A keyboard device characterized by: 2. The keyboard device according to claim 1, wherein said hammer arm has a pressing projection for pressing a switch for instructing start of tone generation when said hammer arm rotates. 3. The sliding contact surface has a click feeling imparting portion having a convex or concave shape for imparting a clicking feeling to the hammer arm when the hammer arm slides on the sliding contact surface. The keyboard device according to claim 1, further comprising: 4. The key according to claim 1, wherein the hammer arm is rotatably supported at a position on the front plate side of the key.
Keyboard device as described.