JPH0713035Y2 - Electronic musical instrument keyboard device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a key mechanism portion of a keyboard device for an electronic musical instrument, for example, a keyboard device such as an electronic piano or an electronic organ.

(Prior Art) Generally, in a keyboard device of an electronic musical instrument, the key switch is only opened and closed by a key operation. Therefore, the performer closes the key switch with the force required to rotate the key. Tones can be generated by adding to this key the total force required for the key.

On the other hand, in the keyboard of a piano as a natural musical instrument, since the hammer for string striking must be driven based on the key depression, the load applied to the key is large, and the performer is required to use the keyboard device of the electronic musical instrument. I felt the key operation heavier than that.

However, when an electronic musical instrument can generate a musical tone that is similar to the musical tone generated by a piano, a keyboard device of the electronic musical instrument is required to have the same touch feeling as that of a piano keyboard.

A conventional keyboard device for an electronic musical instrument based on such a request is shown in, for example, FIG.
No. publication) is known.

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

As shown in this figure, the key 1 is swingably provided around a fulcrum 3. Also, below the key 1, the hammer 5
Is also swingably supported about the fulcrum 7. The hammer 5 is attached to obtain 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 arranged at the right end in the figure,
The force point A of the hammer 5 for swinging the hammer 5 in response to the swing of the key 1 is arranged at the left end in the figure on the side opposite to the center of gravity 9 of the hammer 5.

Therefore, when the key 5 is pressed in the direction of the arrow in the figure, the hammer 5 also swings via 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. Then, it will return to the initial position. That is, when the key is pressed, the desired key touch feeling is obtained by swinging the key 1 against the weight of the hammer 5.

However, in this keyboard device, since the fulcrum 7 of the hammer 5 is arranged at the center portion in the longitudinal direction, the hammer 5 moves in the direction in which the center of gravity 9 of the hammer 5 is lifted, that is, the rotation of the key 1. There was no choice but to rotate in the direction opposite to the direction (arrow in the figure). Therefore, the height at which the center of gravity 9 can be lifted (the above moving distance) was small. This is because the center of gravity 9 comes into contact with the key 1 that descends when it is lifted by a predetermined height.

As a result, if the weight of the hammer 5 itself is constant,
In order to secure the height for the movement and to obtain a desired key touch feeling, the height itself of the keyboard device has to be considerably increased.

Therefore, in the patent application filed on October 6, 1986 (hereinafter referred to as the prior application), when the hammer is provided below the key, the applicant of the present application sets the fulcrum of the hammer at one end in the longitudinal direction, that is, , Proposed a keyboard device for electronic musical instruments, which is arranged at the end in the same direction as the pivot of the key.

In the keyboard device according to this prior application, as shown in FIG. 9, the fulcrum 13 of the hammer 11 is arranged at the right end in the figure below the fulcrum 17 of the key 15, and when the key is depressed, the hammer 11 causes the key 15 to move. It is configured to swing in the same direction as the swinging direction (the direction of the arrow in the figure) of. 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 lengthens the length from the center of gravity 19 of the hammer 11 to the fulcrum 13.

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

However, in the keyboard device for an electronic musical instrument according to such a prior application, when the key 15 and the hammer 11 are pressed, they are both in the same direction as the direction in which the weight 19 of the hammer 11 acts (the arrow direction in the figure). Due to the swinging structure, the hammers 11 and the keys 15 require return springs 21 and 23, respectively, which may result in an increase in the number of parts.

Therefore, in order to solve this concern, even in the keyboard device according to the prior application, both fulcrums of the key swingably supported by the keyboard frame and the swingable hammer interlocking with the key are provided. Paying attention to the fact that they are provided at the end portions on the same side, a keyboard device having a configuration in which these keys and hammers are urged in the direction opposite to the key pressing direction by one plate spring is conceivable.

In this keyboard device, one end of the leaf spring is slidably engaged with the fulcrum portion of the key, the fulcrum portion of the key is pressed against the rotating shaft, and the other end is provided in contact with the fulcrum portion of the hammer. ing. The leaf spring is elastically deformed by the force in the buckling direction (longitudinal direction) due to the rocking of the key and the hammer to give the hammer a return characteristic.

(Problems to be solved by the invention) However, in such a keyboard device of an electronic musical instrument according to the prior application, since one plate spring imparts a habit of returning to the key and hammer, Since one end of the spring is slidably engaged with the fulcrum of the key and the other end is simply abutted with the fulcrum of the hammer, it is not necessary to mount this small leaf spring in the assembly and maintenance of the keyboard device. There was a new problem of difficulty.

(Means for Solving the Problems) Therefore, according to the present invention, the base end of the keyboard frame is engaged with the fulcrum portion directly or indirectly provided on the keyboard frame, and the fulcrum portion swings. A freely supported key, and one end of the key engages with the key and presses it against the fulcrum, while the other end is directly or indirectly locked to the keyboard frame so that the key swings. In a keyboard device of an electronic musical instrument, comprising a leaf spring that elastically deforms in response to movement and imparts a return characteristic to a key, wherein an end of the leaf spring is extended rearward from a rear end of the key. It is an object of the present invention to solve the above-mentioned problems by providing a keyboard device for an electronic musical instrument characterized in that a grip portion is formed.

(Operation and Effect) In the keyboard device of the electronic musical instrument according to the present invention, when the key is pressed,
The key swings around the fulcrum. In this case, when the key swings, the leaf spring elastically deforms. Then, when the key is released, the restoring force of the leaf spring urges the key in the direction opposite to the key pressing direction and returns to the initial position.

As a result, in the keyboard device of the electronic musical instrument, it is possible to reduce the number of parts while simplifying the overall thickness and simplifying the configuration.

Furthermore, according to the present invention, when assembling the key mechanism, when the leaf spring is mounted, the leaf spring can be grasped from the rear side of the key, which is extremely simple and easy. It can be done easily.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of a keyboard device for an electronic musical instrument according to the present invention.

In FIGS. 1 and 2, 31 is a frame of the keyboard device, and 33 is a key (white key) supported by the horizontal frame 31 so as to be vertically swingable about its base end 71. Is. 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, the key 33 is engaged with the pin 35 having a circular cross section fixed to the frame 31 at the base end portion 71 (the end portion on the right side in FIG. 2) (the recess 75 is formed in the base end portion 71). The recessed surface 75 rotatably abuts on the pin 35), and is provided so as to be swingable within the vertical plane about the pin (fulcrum portion) 35. The upper surface of the tip portion (the end portion on the left side in the figure) of the key 33 serves as a key pressing portion 73.

Here, as shown in FIGS. 5 to 7, the pin 35 is formed by subjecting the edge portion of the rectangular slit 37 formed in the frame 31 to so-called outsert processing.
Further, as shown in these drawings, the pin 35 extends along the width direction of the slit 37, and a groove 39 having a predetermined width is formed in the central portion in the extending direction.

That is, this groove 39 is formed in the direction in which the slit 37 extends (key 33
Along the longitudinal direction).

As shown in FIG. 2, the key 33 has a substantially box shape, and its lower surface is open. Further, recesses 41 (hammer driving portions) are formed in the lower portions of both side walls of the key 33.

A hammer 43 is arranged below the key 33 along the key 33, and the hammer 43 is formed into a substantially crank shape by bending as shown in FIG. As shown in FIGS. 1 and 2, a part of the hammer 43 is loosely inserted in the box-shaped key 33.

Further, as shown in FIG. 2, the hammer 43 has a pin 45 fixed to an edge portion on the opposite side of the pin 35 in the slit 37 (this pin 45 has a circular cross section like the pin 35 described above). This is due to the outsert processing) and is swingably supported within the vertical plane. That is, the hammer 43 is provided so as to be vertically swingable in the same vertical plane as the key 33 with the pin 45 as a fulcrum (with the base end portion 81 as a fulcrum). In addition, the second of the base end portion 81
A semicircular engagement surface 85 is formed in a concave shape on the left side surface in the figure, and the engagement surface 85 engages with the pin 45.

Further, as shown in FIG. 3, the hammer 43 has a core material made of a predetermined metal so as to have a predetermined weight, and most of the outer surface of the core material is edged with resin by outsert processing. There is. Further, the center of gravity of the hammer 43 is arranged on the side of the distal end portion 83 (the left end portion in FIG. 2) in the longitudinal direction.

Further, a bifurcated switch portion 47 is provided so as to protrude downward in the vicinity of the fulcrum portion 81 of the hammer 43. That is, when the switch portion 47 descends due to the swing of the hammer 43, the switch portion 47 comes into contact with a switch (not shown) arranged on the frame 31 to close (ON) the switch.

An actuator section 49 is provided above the switch section 47 of the hammer 43 in the horizontal direction so that the concave section 41 of the key 33 comes into contact therewith and pushes down the hammer 43 (see FIGS. 1 and 3). That is, the lower surface of the recess 41 (hammer driving portion) of the key 33 is in contact with the actuator portion 49 of the hammer 43.

The key 33 and the hammer 43 are also played in the slit 51 formed in the frame 31, as shown in FIG. That is, as shown in FIG. 5, the frame 31
, Are formed in the vertical plane, and the key 33 and the hammer 43 swing through these slits 37, 51 ,.

As shown in FIG. 1, felts (stoppers) 53 and 55 for restricting the upper limit position and the lower limit position of the hammer 43 are fixed to the frame 31. Further, as shown in the same figure, a felt (stopper) 5 that similarly regulates the upper limit position and the lower limit position of the key 33 is provided at a predetermined position of the frame 31.
7 and 59 are fixed respectively.

Here, as shown in FIGS. 2 and 4, 61 is a strip-shaped leaf spring made of metal and having a predetermined elastic coefficient,
The other end 93 of the leaf spring 61 is the base end (one end) 81 of the hammer 43.
At one end side of the fulcrum portion 45 (reaction side of the engaging surface 85)
It is brought into contact with and locked in the locking groove 63 formed in. Further, one end 91 of the leaf spring 61 is formed such that its width is smaller than that of the other end and is inserted into a groove 39 formed between the pins 35 which are fulcrums of the swing of the key 33. The upper surface of the one end 91 pushes up the lower surface of the one end (base end) 71 of the key 33.

That is, as shown in FIG. 4, the leaf spring 61 has one end portion 91 having a small width which is loosely inserted into the groove 39 between the pins 35, and the upper surface of the one end portion 91 serves as a base for the key 33. edge
The recessed surface 75 is arranged so as to be in sliding contact with the lower surface of 71 and to be pressed against the pin 35. In other words, the leaf spring 61 is
When one end 91 is engaged with the base end 71 and the other end 93 is brought into contact with and locked by the locking groove 63, when the hammer 43 swings downward during key depression, the longitudinal direction of the leaf spring 61. Is restricted by the frictional force at one end 91 (compressive force acts in the buckling direction)
It is elastically (curved) deformed in the thickness direction. As a result, the leaf spring 61 constantly urges the hammer 43 in the clockwise direction in FIG. 2 (giving a habit of returning).

Here, one end 91 of the leaf spring 61 is extended in the longitudinal direction thereof, and a wide portion 95 having a width wider than that of the groove 39 is formed in the extended edge portion. This wide part 95 is a leaf spring
It serves as a gripping portion for gripping 61.

Further, the wide portion (grasping portion) 95 abuts the one end wall of the groove 39 into which the one end 91 is loosely inserted to prevent the plate spring 61 from being excessively deformed. That is, the wide portion 95 and the groove 39 are the leaf springs.
By controlling the curved deformation of 61, one end 91 of the
The leaf spring 61 is prevented from falling off from the base end portion 71 of 33, and further, the base end portion 71 of the key 33 is disengaged from the pin 35 by the drop, and the base of the hammer 43. It constitutes a retaining means for preventing the end portion 81 from being disengaged from the pin 45.

Furthermore, on the side wall of the slit 37 of the frame 31, as shown in FIGS. 2, 5, and 6, a stopper member 103 formed by outsert processing is provided upright. The stopper member 103 is disposed above the leaf spring 61 at a predetermined distance, and regulates the leaf spring 61 so as not to be excessively bent and deformed in the thickness direction when the leaf spring 61 is buckled and deformed. . Therefore, this stopper member 103 also
One end portion 91 of the leaf spring 61 is separated from the base end portion 71 of the key 33 to drop the leaf spring 61, and the above-mentioned base end portions 71 and 81 are prevented from being disengaged from the pins 35 and 45, respectively. Constitutes a means.

The stopper member 103 has a gate shape extending in the width direction of the slit, as shown in FIGS. 5 and 6. Specifically, the pair of leg portions 107 and 109 provided upright from the edge portion of the slit 37 of the frame 31 and the leg portions 107 and 1
The stopper member 103 is composed of a ceiling portion 111 bridging the upper ends of 09, and projecting portions 113 and 115 that project substantially horizontally from the ceiling portion 111 toward both sides of the slit 37 in the extending direction.
Is configured. Then, the protrusions 113 and 115 have the key 3
When the 3 and the hammer 43 are assembled to the frame 31, they are locked to the base end portion 71 and the base end portion 81, respectively, to prevent them from coming off. That is, the protrusions 113 and 115 are members for temporarily fixing these.

In the keyboard device having the above configuration, the other end portion 73 of the key 33 is
If you push (the tip) downward, the key 33 will
71, that is, the pin (fulcrum portion) 35 with which the engagement surface 75 of the base end portion 71 is engaged is pivoted.

Here, since the lower surface of the recess 41 of the key 33 is in contact with the actuator portion 49 of the hammer 43, the hammer 43 also descends as the key 33 swings. That is, the hammer 43 has a pin fulcrum 45
Is swung around, and the switch 47 presses the switch. That is, the switch is turned on, and a musical tone having a pitch corresponding to the key 33 is generated by a predetermined musical tone forming circuit (not shown) through, for example, a speaker or the like.

At this time, the leaf spring 61 is preliminarily bent and mounted, but is further buckled and deformed by the swing of the hammer 43, and is bent in the thickness direction thereof, and a predetermined restoring force is applied to the hammer 43.
The deflection of the flat plate-shaped leaf spring 61 can be increased by slightly increasing the load. Therefore, the resistance force to this swing generates a key touch feeling. Further, in this case, the one end 91 of the leaf spring 61 presses the base end 71 (75) of the key 33 against the pin 35, and the other end 93 presses the base end 81 (85) of the hammer 43 against the pin 45. ing.

In this case, since one end 91 of the leaf spring 61 is in pressure contact with the plate surface of the base end 71 of the key 33, a predetermined curved deformation occurs, but when the amount of deformation increases, the ceiling portion 111 of the stopper member 103 The upper surface of the leaf spring 61 comes into contact with the lower surface, and the wide portion 95 comes into contact with the one end wall of the groove 39 to prevent its excessive deformation, and the key 33 is locked by the pin 33.
Even when the key 33 is disengaged, that is, when the key 33 is pulled toward the distal end side in the longitudinal direction, the disengagement is prevented. At the same time, this prevents one end portion 91 of the leaf spring 61 from coming off from the base end portion 71 of the key 33, the leaf spring 61 itself falls off, and further, the base end portion 81 of the hammer 43 is pinned.
It is possible to prevent from leaving the 45. That is, the leaf spring 61 is prevented from coming off.

Then, when the key 33 is released, both the key 33 and the hammer 43 are given a return habit by one leaf spring 61, so that they are oscillated in the opposite direction by the urging force of the leaf spring 61. Then, the key 33 and the hammer 43 come into contact with the felts 57 and 53, respectively, and return to their upper limit positions.

Further, in the assembling work of this key mechanism, the removing work at the time of maintenance work, etc., the leaf spring 61 can easily hold the wide grip portion 95 formed by extending the one end portion 91 thereof,
You can do that very easily.

Further, in the present invention, the wall touch feeling can be set to be hard or soft by appropriately changing the bending rigidity of the leaf spring.

[Brief description of drawings]

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 sectional view showing the relationship between a key and a hammer according to an embodiment, and FIG. FIG. 4 is a front view showing a hammer according to one embodiment, FIG. 4 is a plan view showing a leaf spring according to one embodiment, FIG. 5 is a plan view showing a frame according to one embodiment, and FIG. 5 is a sectional view taken along the line VI-VI in FIG. 5, FIG. 7 is a sectional view taken along the line VII-VII in FIG. 5, FIG. 8 is a model diagram showing the operating principle of the conventional keyboard device, and FIG. FIG. 6 is a demolition diagram showing the operating principle of the keyboard device according to FIG. 31 …… Frame, 33 …… Key, 35 …… Pin (fulcrum), 61
...... Leaf spring, 71 …… Key base end, 91 …… One end of leaf spring, 93 …… The other end of leaf spring, 95 …… Grip.

Claims (2)

[Scope of utility model registration request] 1. A keyboard frame, a base end of which engages with a fulcrum portion directly or indirectly provided on the keyboard frame, and which is swingably supported by the fulcrum portion, and one end thereof. Engages with the key and presses it against the fulcrum, and the other end is directly or indirectly locked to the keyboard frame, elastically deforming in response to the swing of the key A keyboard device for an electronic musical instrument, comprising: a leaf spring that imparts a return characteristic, wherein an end portion of the leaf spring is extended rearward from a rear end portion of the key to form a grip portion. Instrument keyboard device. 2. The keyboard device has a hammer swingably provided on a keyboard frame so as to interlock with a key, and the other end of the leaf spring is locked to the hammer to restore the hammer. A keyboard device for an electronic musical instrument according to claim 1, wherein: