JPH05954Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to improvement of the key mechanism of a keyboard device for an electronic musical instrument, such as an electronic piano or an electronic organ.

(Prior Art) In general, in the keyboard device of an electronic musical instrument, the key switch is simply opened and closed by key operation, so the player has to apply the force necessary to turn the key and the force necessary to close the key switch. If the sum of these forces is applied to a key, musical tones can be generated.

On the other hand, in the case of natural musical instruments, such as the piano, the hammer for striking the strings (a mass body that exerts an inertial effect) must be driven based on the key presses.
The load applied when pressing a key is large, and the performer feels that the key operation is heavier than the above-mentioned keyboard device of an electronic musical instrument.

However, it has become possible for electronic musical instruments to generate musical tones similar to those generated by a piano, and the keyboard devices for these instruments are now required to have the same touch feel as a piano keyboard.

As a conventional keyboard device for an electronic musical instrument based on such a demand, for example, the one shown in FIG. 8 (Japanese Patent Application Laid-Open No. 147691/1983) is known.

FIG. 8 is a model diagram showing the operating principle of the key mechanism of this conventional keyboard device.

As shown in this figure, the key 1 is swingably provided around a fulcrum 3. A hammer 5 is also supported below the key 1 so as to be swingable about a fulcrum 7. The hammer 5 is provided to provide a key touch feeling similar to that of an ordinary piano, and has a predetermined weight. The center of gravity 9 of the hammer 5 is located at the right end in the figure, and the force point A of the hammer 5 for swinging the hammer 5 in response to the swing of the key 1 is at the left end in the figure opposite to the center of gravity 9. It is located in

Therefore, when a key is pressed, the hammer 5 also swings through the force point A, while when the key 1 is released, the weight of the hammer 5 causes the hammer 5 and the key 1 to swing clockwise in the figure, returning to the initial position. He will be returning. That is,
When a key is pressed, the key 1 is swung against the weight of the hammer 5 to provide a tactile feel. In other words, the hammer 5 exerts an inertial effect when a key is pressed.

However, in this keyboard device, since the fulcrum 7 of the hammer 5 is arranged at the center in the longitudinal direction, when a key is pressed, the hammer 5 moves in the direction in which its center of gravity 9 is lifted, that is, the rotation of the key 1. It had no choice but to rotate in the opposite direction to the direction (arrow in the figure). Therefore, the height to which the center of gravity 9 is lifted (the above-mentioned moving distance) has become smaller. This is the center of gravity 9
Key 1 that descends when is lifted to a predetermined height
This is because it comes into contact with.

As a result, if the weight of the hammer 5 itself is constant, the height of the keyboard device itself must be made considerably larger in order to secure the height for its movement and obtain the desired key touch feeling. Nakatsuta.

Therefore, in the patent application dated October 6, 1985 (hereinafter referred to as the earlier application), the applicant proposed that when a hammer (mass body) is provided below the key, the fulcrum of the hammer is set in the longitudinal direction. We have proposed a keyboard device for an electronic musical instrument that is arranged at one end, that is, the end in the same direction as the fulcrum of key swing.

In the keyboard device according to this prior application, as shown in FIG. 9, the fulcrum 13 of the hammer 11 is located below the fulcrum 17 of the key 15, at the right end in the figure, and when a key is pressed, the center of gravity 19 of the hammer 11 is configured to swing in the same direction as the swing direction of the key 15 (arrow direction in the figure). This makes it possible to increase the moving distance (height) of the center of gravity 19 of the hammer 11 when a key is pressed, and also increases the length from the center of gravity 19 of the hammer 11 to the fulcrum 13.

As a result, in order to obtain the desired key touch feeling by swinging the hammer 11, it is possible to increase the movement distance of the center of gravity 19, and as a result, the height of the keyboard device can be lowered. . In other words, the device could be made thinner.

However, in the keyboard device of the electronic musical instrument according to the prior application, the key 15 and the hammer 11 move together in the same direction as the direction in which the weight 19 of the hammer 11 acts (arrow direction in the figure) when the key is pressed. Due to the swinging structure, in principle, return springs 21 and 23 are required for each of the hammer 11 and the key 15, resulting in an increase in the number of parts.

In order to solve this problem, the fulcrums of the key, which is swingably supported by the keyboard frame, and the swingable hammer, which is linked to the key, are provided at the same end. Focusing on this, a keyboard device (hereinafter referred to as the proposed keyboard device) is considered, which is configured to bias these keys and hammers in a direction opposite to the key pressing direction by a single leaf spring.

In this keyboard device, one end of the leaf spring slidably engages with the base end of the key and presses the base end of the key against the rotation shaft (fulcrum of the frame), and the other end of the leaf spring is attached to the base of the hammer. It is provided in contact with the end of the hammer, and presses the proximal end of the hammer against the rotation shaft that is the hammer's fulcrum. This leaf spring is elastically deformed by the force in the buckling direction (longitudinal direction) due to the swinging of the key and hammer, thereby imparting a return behavior to the hammer.

(Problem to be solved by the invention) However, in the keyboard device according to such a proposal, one end of the leaf spring has the base end of the key as its pivot axis (the fulcrum of the frame), and the other end It was constructed so that the base end of the hammer, which is a mass body, was pressed against the hammer fulcrum. In other words, the only force that pressed the base end of the hammer against the hammer fulcrum (rotation shaft) was the urging force of the leaf spring. Furthermore, if the base end separated from the rotation axis, no measures were taken to prevent it from separating too far.
If an impact force acts in the direction of release during transportation, etc., one end of the leaf spring may move in the longitudinal direction due to elastic deformation of the leaf spring, and there is a risk that the hammer may easily come off from its swinging fulcrum. Ta.

(Means for Solving the Problems) Therefore, the present invention provides a key that is swingably supported on a fulcrum provided on a keyboard frame, and a key that abuts the key, and when the key is pressed and returned, the key is A mass body that is swingably supported by the mass body fulcrum of the key or the keyboard frame in an interlocking manner and exerts an inertial effect, and this mass body is attached in a direction opposite to the rocking direction when the key is pressed. an elastic member that presses the mass body against the mass body fulcrum part; A keyboard device for an electronic musical instrument is provided in which the key or the keyboard frame is provided with a regulating portion that comes into contact with the contact portion and restricts the movement of the mass body when the mass body moves a predetermined distance in a direction away from the body supporting point. By submitting
Its purpose is to resolve the above concerns.

(Operations and Effects) Regarding the keyboard device for an electronic musical instrument according to the present invention,
When a key is pressed, the key swings in one direction. In this case, when the key swings, the mass body also swings in contact with the key. As a result of this rocking, the elastic member is elastically deformed.
When the key is released, the restoring force of the elastic member urges the mass body in a direction opposite to the rocking direction caused by the key depression, and the key and the mass body return to their initial positions.

As a result, the keyboard device for an electronic musical instrument can be made thinner as a whole, the number of parts can be reduced, and the structure can be simplified.

Furthermore, even if an impact force is applied during transport of the keyboard device, the mass body can be prevented from easily coming off in the longitudinal direction. In other words, when an impact force acts in the direction in which the mass body separates from the mass body fulcrum, and the mass body moves away from the fulcrum by a predetermined distance, the abutment part will come into contact with the restriction part provided on the key or keyboard frame. As a result of contact and restriction of movement, the mass body separates from the mass body fulcrum (decoupling)
This prevents them from doing so.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 5 show an embodiment of a keyboard device for an electronic musical instrument according to the present invention.

1 and 2, 31 is a frame of the keyboard device, and 33 is supported on this frame 31 so as to be able to swing vertically (vertically in FIG. 2) around its base end 34. This is the key (white key). Further, 32 is a black key. The frame 31 is made of, for example, metal so as to have a predetermined rigidity, while the key 33 is made of, for example, synthetic resin.

That is, this key 33 engages with a circular stepped pin 35 fixed to the frame 31 at its base end 34 (the right end in FIG. 2) (the base end 34 has a recess 36). The recessed surface 36 is rotatably abutted on the pin 35), and is provided to be swingable in a vertical plane about the pin (the fulcrum of the key) 35. Further, the top surface of the tip of the key 33 (the end on the left side in the figure) serves as a key pressing portion 38 .

Here, the pin 35 is formed by performing so-called outsert processing on the edge portion of a rectangular slit 37 formed in the frame 31. Also,
A groove of a predetermined width is formed in this pin 35, and this groove extends along the direction in which the slit 37 extends (the longitudinal direction of the key 33).

As shown in FIGS. 2 to 5, the key 33 has a substantially box-like shape, and its lower surface is open. moreover,
A recess 39 (hammer driving part) is formed in both side walls of the key 33.

Here, as shown in these figures, the proximal side wall of the recess 39 protrudes downward by a predetermined length to form a protrusion 40 .

Further, a hammer 41 is disposed below the key 33 along the key 33, and this hammer 41 is connected to a second
As shown in the figure, it is bent into a substantially crank shape. Further, as shown in these figures, a portion of this hammer 41 is loosely inserted inside the box-shaped key 33.

Furthermore, as shown in FIG. 2, this hammer 41 has a pin 45 fixed to the edge of the slit 37 opposite to the pin 35 (this pin 45 has a circular cross section like the pin 35 described above). (This is due to outsert processing.) It is supported so as to be able to swing freely within the vertical plane above. That is, the hammer 41 is provided so as to be able to swing vertically within the same vertical plane as the key 33, using the pin 45 as a fulcrum (in other words, using the base end 42 of the hammer 41 as a fulcrum). Note that this base end portion 42
A semicircular engagement surface 43 is provided on the left side surface in FIG.
is formed in a concave manner, and this engaging surface 43 engages with the pin 45 (being urged by a leaf spring to be described later and pressed into contact with the pin 45). Therefore, this pin 45 forms a hammer fulcrum.

Note that this hammer fulcrum portion 45 may be provided on the key 33.

Also, as shown in these figures, this hammer 4
1 has a core material (hammer frame) 44 made of a predetermined metal so as to have a predetermined weight;
Most of the edges of 4 are edged with resin by outsert processing. Further, the center of gravity of the hammer 41 is located at the tip 46 (the left end in FIG. 2) of the hammer 41 in its longitudinal direction. This hammer 41 constitutes a mass body that exerts an inertial effect when a key is pressed. Note that 48 is a through hole formed in the hammer 41.

Further, a bifurcated switch driving portion 50 is provided protruding downwardly adjacent to the base end portion 42 of the hammer 41. That is, when the switch drive unit 50 is lowered by the swinging of the hammer 41, the switch 52
It comes into contact with. The switch 52 is disposed on a printed circuit board 54 supported by a holder 53 hanging from the lower surface of the frame 31, and has a pair of switch parts 56 and 58 made of conductive rubber with circular cross sections. Therefore, when a key is pressed, the switch driving section 50 comes into contact with the key through the slit 60 formed in the frame 31, and the switch 52 is closed (ON).
It is something to do. This switch 52 is of a so-called touch response type, and has two switch parts 5.
6 and 58 are closed at different timings, and the time difference is detected to determine the volume of the musical tone, the envelope change,
This controls the tone, etc.

The switch drive unit 50 of this hammer 41
Above, there is an actuator section 47 with which the recess 39 of the key 33 comes into contact and presses down the hammer 41.
is provided protruding horizontally (see Figure 2). That is, the lower surface of the recess 39 (hammer drive section) of the key 33 is in contact with the actuator section 47 of the hammer 41. This actuator section 47 includes a base section 62 made of resin and a contact section 63 also made of resin.
A vibration-absorbing part 64 made of rubber is interposed between the key 33 and the hammer 41, and this vibration-absorbing part 64 alleviates the impact force caused by the impact between the key 33 and the hammer 41. In addition, the right side surface of the actuator section 47 in FIG.
The protrusion 40 of the key 33 when the key is pressed as shown in the figure.
is placed a predetermined distance away from the Therefore, this vibration absorbing portion 64, its base portion 62, and the contact portion 6
Reference numeral 3 constitutes a member falling-off prevention portion 65 that comes into contact with the protrusion 40 and restricts the movement of the key 33 to the left side in the figure.

In other words, the member falling-off preventing portion 65 is indirectly provided on the frame 31 via the hammer 41 supported by the frame 31.
Note that this member falling-off prevention portion 65 can also be provided directly on the frame 31.

Further, each part of the hammer 41 is connected to a slit 6 formed in the frame 31, as shown in FIG.
It is also played in 6,67. That is, the frame 31 has a plurality of slits 37, 60, 6.
6, 67... are formed. The hammer 4 is played in this slit 66.
1 (outsert processing part), that is, the part opposite to the edge part 68 on the right side in the figure of the slit 66 when the key is pressed (see Figure 3), there is a part that protrudes by a predetermined width toward the right side in the figure. A contact portion 70 is formed. As shown in the figure, this contact portion 70 is provided so as to protrude so as to be opposed to the edge portion 68 of the slit 66 by a predetermined distance (a small distance) when the key is pressed. That is, the edge portion 68 comes into contact with the contact portion 70 and constitutes a restriction portion that restricts movement (dislodgement) of the hammer 41 to the right.

In addition, stoppers (felt) 71 and 72 are fixed to the frame 31 for regulating the upper and lower limit positions of the hammer 41, respectively. Further, at a predetermined position of the frame 31, there is also a stopper (felt) 5 for regulating the upper and lower limit positions of the key 33.
7 and 59 are fixed respectively. Furthermore, 7
4 is the guide part of the white key 33, 75 is the guide part of the black key 32, 76 is the lower limit stopper (felt) of the black key 32, and 77 is a screw hole part for fixing the frame 31 to the instrument body. are shown respectively.

Again, as shown in FIG. portion) 42 and is locked in a locking groove 63 formed on one end side of the hammer fulcrum portion (pin) 45 (on the opposite side of the engaging surface 43).
Further, one end 81 of this plate spring 61 is inserted into a groove formed between the pins 35 which are the fulcrum of the swing of the key 33, and the upper surface of the one end 81 is connected to one end (base end) of the key 33. Part) 34 The lower surface is pushed up.

That is, this leaf spring 61 has one end 81
is loosely inserted into the groove between the pins 35, and the upper surface of one end 81 slides against the lower surface of the proximal end 34 of the key 33, so that the concave surface 36 is pressed (pressed) against the pin 35. It is arranged. In other words, the leaf spring 61 has one end 81 connected to the base end 3.
4 and the other end 80 abuts and is locked in the locking groove 63, thereby pressing the base end 42 of the hammer 41 against the hammer fulcrum 45,
When the hammer 41 swings downward when the key is pressed, the leaf spring 6
The longitudinal movement of 1 is regulated by the frictional force at one end 81 (compressive force acts in the buckling direction), causing elastic deformation (curving) in the thickness direction. the result,
The leaf spring 61 constantly biases the hammer 41 in the clockwise direction in FIG. 2 (imparts a returning habit).

Further, on the side wall of the slit 37 of the frame 31, as shown in FIGS. 2 to 5, a stopper member 83 formed by outsert processing is provided upright. This stopper member 83 is connected to the plate spring 6.
1 at a predetermined distance apart from each other, and prevents the leaf spring 61 from excessively bending in the thickness direction when the leaf spring 61 undergoes buckling deformation. Therefore, in this stopper member 83, one end 81 of the leaf spring 61 separates from the base end 34 of the key 33, the leaf spring 61 falls off, and each of the base ends 34, 42 engages the pin 3.
5 and 45 respectively.

Note that this stopper member 83 is connected to the slit 37.
The frame 31
Legs 84 erected from the base and horizontal protrusions 85
and an inclined protrusion 86. When the key 33 and the hammer 41 are assembled to the frame 31, the protrusions 85 and 86 are engaged with the proximal ends 34 and 42, respectively, to prevent them from coming off. That is, the protrusions 85 and 86 serve as members for temporarily fixing these parts.

In the keyboard device having the above configuration, the key 33
When the key pressing part 38, which is the other end (tip part), is pressed downward, the key 33 presses the base end 34, that is, the pin (fulcrum part) with which the engagement surface 36 of the base end 34 engages. )35 as a fulcrum.

Here, the lower surface of the recess 39 of the key 33 is connected to the hammer 41.
As the key 33 swings, the hammer 41 also descends. That is, the hammer 41 swings about the pin fulcrum 45, and the switch driving section 50 presses the switch. In other words, switch 52 is turned on,
A musical tone having a pitch corresponding to this key 33 is produced by a predetermined musical tone forming circuit (not shown) through, for example, a speaker.

At this time, the plate spring 61 is installed in a pre-deformed state, but due to the rocking of the hammer 41, the plate spring 61 is further buckled and bent in its thickness direction, thereby imparting a predetermined restoring force to the hammer 41. The deflection of this flat leaf spring 61 can be increased by a slight increase in load. Therefore, the resistance force against this rocking is what generates the key touch feeling. Further, in this case, one end 81 of the leaf spring 61 presses the base end 34 (36) of the key 33 against the pin 35, and the other end 80 presses the base end 34 (36) of the hammer 41 against the pin 35.
2 (43) is pressed against the pin 45.

In this case, since the one end 81 of the leaf spring 61 is in pressure contact with the lower surface of the base end 34 of the key 33, it undergoes a predetermined curving deformation, but when the amount of deformation increases, the protrusions 85, 86 of the stopper member 83 The upper surface of the leaf spring 61 comes into contact with the lower surface of the leaf spring 61 to prevent its excessive deformation,
This prevents the key 33 from coming off from the pin 35, that is, even when the key 33 is pulled toward its longitudinal end. at the same time,
This prevents one end 81 of the leaf spring 61 from separating from the base end 34 of the key 33.
This can prevent the leaf spring 61 itself from falling off, and furthermore, the base end 42 of the hammer 41 from coming off the pin (hammer fulcrum) 45. That is, the key 33 and the hammer 41 are prevented from coming off.

Note that when the key 33 is released, the key 33 and the hammer 41 are released.
Since both are given a return behavior by a single leaf spring 61, the biasing force of the leaf spring 61 causes them to swing in opposite directions. The key 33 and the hammer 41 then come into contact with stoppers (felts) 57 and 71, respectively, and return to their upper limit positions.

In this embodiment, for example, when transporting the keyboard device after it has been assembled and packed, the key 3
3 and hammer 41 whose longitudinal direction is up and down (vertical)
Even if a large impact force is applied in the vertical direction due to a drop or the like while the key 33 and the hammer 41 are positioned in the same direction, the key 33 and the hammer 41 will not come out of their assembled state. That is, when the key 33 moves a predetermined distance in the longitudinal direction due to the impact force in the above state, the protrusion 4 of the key 33 moves.
0 comes into contact with the vibration absorbing rubber 64 or the side surface of its base 62 (member drop-off prevention part 65), so that excessive movement in the longitudinal direction is restricted. At the same time, when the hammer 41 moves a predetermined distance in the direction away from the hammer fulcrum 45, the contact portion 70 contacts the edge portion (regulating portion) 68 of the slit 66. This also prevents the hammer 41 from falling off. In this case, it is assumed that the key 33 and the hammer 41 are prevented from moving (dislodging) in other directions (for example, in the vertical direction in FIG. 2) by a packing member or the like.

Next, a case in which the key 33 and hammer 41 are removed after being unpacked will be described with reference to FIGS. 3 to 5.

First, as shown in FIG. 3, the key 33 is pushed down, and then, as shown in FIG. 4, the leaf spring 61 is pulled out. As a result, the hammer 41 comes into contact with the stopper 72 due to its own weight. Then, as shown in FIG. 5, after moving the key 33 in the direction of the arrow
0 comes into contact with the member falling-off prevention part 65, and the base end 34 comes into contact with the tip of the protruding part 85), and lifts the base end 34 of the key 33 in the direction of arrow Y (in this state, the key 33 only moves upward). proximal end 34 is movable). After removing the key 33 in this way,
The hammer 41 is removed from the slits 66 and 67.

As described above, since the protrusion 40 is formed by the side wall of the recess 39 and the member drop-off prevention part 65 is formed by the actuator part 47, it is possible to use these parts together, and the production is simple and the number of parts is reduced. can be reduced.

6 and 7 show other embodiments of the present invention.

In these figures, the side wall of the hammer 41 on the protrusion 40 side of the switch drive section 50 is molded with resin by outsert processing, and this side wall is used as the abutment section 90. That is, when the hammer 41 moves a predetermined distance to the right in FIG.
The hammer 41 comes into contact with the right edge portion 91 of the first slit 60 to restrict movement of the hammer 41. Therefore, this edge portion 91 constitutes a regulating portion. As a result, in addition to the above effects, it is possible to achieve a reduction in the number of parts due to the dual use of members.

The other configurations and operations are the same as those of the above embodiment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a keyboard device for an electronic musical instrument according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing the relationship between a key and a hammer according to an embodiment, and FIG.
FIG. 4 is a vertical cross-sectional view showing the relationship between the key and the hammer when the key is pressed according to one embodiment, and FIG. 4 is a vertical cross-sectional view showing the relationship between the key and the hammer according to one embodiment with the leaf spring removed. FIG. 5 is a vertical cross-sectional view for explaining the case of removing the key according to one embodiment,
FIG. 6 is a longitudinal sectional view showing the main parts in the relationship between the key and the hammer according to another embodiment of the present invention;
FIG. 7 is a perspective view showing a contact part according to another embodiment, FIG. 8 is a model diagram showing the operating principle of the conventional keyboard device, and FIG. 9 is the operating principle of the keyboard device according to the prior application. FIG. 31...keyboard frame, 33...key, 35...
Pin (fulcrum part), 41...Hammer (mass body), 45
...Pin (mass body fulcrum part), 61... Leaf spring (elastic member), 68... Edge portion (regulating part), 70... Contact part.

Claims (1)

[Claims for Utility Model Registration] A key supported swingably on a fulcrum provided in a keyboard frame, and a key or the above-mentioned key that is in contact with the key and interlocks with the key when the key is pressed and when the key is returned. A mass body is swingably supported on a mass body fulcrum part of a keyboard frame and exhibits an inertial effect, and this mass body is biased in a direction opposite to the rocking direction when a key is pressed. An elastic member brought into pressure contact with the mass body fulcrum, and a keyboard device for an electronic musical instrument, comprising: providing a contact portion on a part of the mass body;
When the mass body moves a predetermined distance in a direction away from the mass body fulcrum, the key or the keyboard frame is provided with a regulating part that comes into contact with the abutting part and restricts the movement of the mass body. Features a keyboard device for electronic musical instruments.