JPH0125998Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Technical field of the invention] This invention changes the volume depending on the amount of pedal depression.
The present invention relates to a pedal device for an electronic musical instrument that allows a user to freely obtain a sense of rhythm and presence based on the intensity of the sound.

[Prior art]

Conventionally, electronic musical instruments such as electronic organs have been designed to electrically generate musical tones of a predetermined pitch by controlling the opening and closing of key switches by pressing keys (manual keyboards). The musical sound output can also be controlled by a pedal device,
It is designed to generate musical tones with rich playability.
Figure 1 shows an example of a conventional pedal device of this type, which has the same performance effect as the damper mechanism of a general piano by controlling the opening and closing of a switch (sustaining the musical tone regardless of the return of the key, , enriching the sound quality).
1 is the bottom plate of the instrument body, 2 is the front base, 3 is the lower front plate,
4 is a pedal. The rear end of this pedal 4 is held on the bottom plate 1 via a leaf spring 5 so as to be able to move up and down, and the front end of the pedal 4 is projected forward of the instrument body through the pedal window 6 of the front base 2 and can be selectively depressed. Be manipulated. A switch 7 is fixed to the inner surface of the front base 2 via a mounting member 8 in correspondence with the pedal 4, and an actuator 10 is attached to the tip of the leaf spring 5 in correspondence with the movable leaf 9 of the switch 7. installed on. The switch 7 is configured such that the movable leaf 9 is normally pushed upward by the actuator 10, and the upper fixed leaf 1
1 constitutes a normally open contact, and when the pedal 4 is depressed, the movable leaf 9 is released from the actuator 10 and contacts the lower fixed leaf 1.
It is closed by contacting with 2.

Here, if a musical sound output is generated by simply pressing a key (not shown) without depressing the pedal 4, the generation time (or envelope characteristic) is the key operation time, in other words, the key switch ( (not shown). Next, press the pedal 4 to close the switch 7,
When a musical tone is generated by operating the keys while maintaining this state, the generation time is controlled by the switch 7 together with the key switch.

In other words, while a general piano releases the strings from the damper to sustain the vibration of the strings, an electronic musical instrument uses a pedal device to electrically control the musical tone and sustain it.

However, in such conventional pedal devices, a constant volume is maintained simply by turning the switch 7 ON and OFF, so the volume is changed depending on the depression angle of the pedal 4, and the rhythmic feeling and realism are created by changing the strength of the sound. The drawback was that I could not freely feel the emotions. Further, the leaf contact type switch 7 had a durability problem.

Recently, a volume adjustment device for an electronic musical instrument (Japanese Patent Publication No. 40194/1983) has been disclosed which allows the volume to be freely changed depending on the strength of pressing the key. This is composed of a band-shaped resistance element arranged in correspondence with the key, and an actuating member that rotates in conjunction with the key and slides on the resistance element. In addition, the space in the keyboard section was small, and the number of parts increased significantly because each key had to be provided individually, making assembly difficult.

[Summary of the idea]

This idea was made in view of the above-mentioned points, and the pedal is provided with a drive section, and correspondingly an element is arranged to control the musical tone by changing the resistance value.
A pair of elastic members having different spring constants and facing each other vertically across the drive section are provided on the rotating shaft, and the upper elastic member is pressed against the drive section, and the spring constant of the lower elastic member is set to the upper elastic member. and the lower elastic member is located within the downward movement area of the drive unit, so that when the pedal is depressed at a certain angle, the drive unit presses the lower elastic member to control the control. To provide a pedal device for an electronic musical instrument, which can freely change the volume with an extremely simple configuration of driving elements, has excellent durability, and can give play to pedal depression like a piano. It is.

This invention will be described in detail below based on embodiments shown in the drawings.

〔Example〕

FIG. 2 is a perspective view showing an embodiment of the pedal device according to this invention, and FIG. 3 is a side sectional view of the main part thereof. Components in the figure that are the same as those in FIG. 1 are designated by the same reference numerals. A pin 20 as a driving part is protruded from the middle part in the longitudinal direction of one side of the pedal 4, and a rotary variable resistor 21 as a musical tone control element and a pair of upper and lower elastic members are connected to the pin 20. Leaf springs 22 and 23 are provided.

The rotary variable resistor 21 is a bottom plate (not shown).
It is attached to a bracket 25 erected thereon by a set screw 24 so that its rotating shaft 26 is parallel to the pin 20. The rotating shaft 26 passes through the bracket 25 and extends toward the pedal, and the pair of leaf springs 22 and 23 are fixed to the distal end of the rotating shaft 26 via a case 27.

The pair of leaf springs 22 and 23 are integrally formed by bending a single metal plate into a substantially U-shape, so that they have a common base A, and the base A holds the case 27. It is fixed to the case 27, and its tip portions sandwich the pin 20 and are vertically opposed to each other. The upper leaf spring 22 is pressed against the pin 20 via a buffer member 28 such as felt, while the lower leaf spring 23 is pressed against the upper leaf spring 22.
By setting the width to be sufficiently large, the spring constant is large, and the stopper 30 is in pressure contact with the lower surface of the stopper 30, and is located within the downward movement region of the pin 20 at a distance of Δd from the pin 20. Note that the stopper 30
is integrally formed with the bracket 25.
Further, 31 is a buffer member fixed to the lower leaf spring 23.

Next, the operation of the pedal device having such a configuration will be explained. As shown in FIG. 3, when the pedal 4 is not depressed, the lower leaf spring 23 comes into contact with the stopper 30. Since it is at the initial position, the resistance value of the rotary variable resistor 21 does not change, and therefore the volume of the musical tone generated by key operation does not change.

In this state, when the pedal 4 is gradually depressed, the upper leaf spring 22 is released as shown in FIG. 4a.
returns elastically and maintains contact with the pin 20. On the other hand, since the lower leaf spring 23 has a large spring constant, it maintains its initial position regardless of the elastic return of the upper leaf spring 22. Therefore, the rotary variable resistor 21 also maintains its initial position.
When the pedal 4 is depressed by more than one angle, the pin 2
0 is the lower leaf spring 23 as shown in FIG. 4b.
In order to contact and push down the pedal 4, the rotating shaft 26 rotates to continuously change the resistance value of the rotary variable resistor 21, thereby changing the volume of the musical tone according to the depth of depression of the pedal 4. . As a result, performance sounds with a sense of rhythm and presence can be obtained.

Here, the pin 20 and the lower leaf spring 23 are connected by Δd
By separating the pedals by a certain amount, the pedals 4 can have some play, similar to a general piano. Further, the pair of leaf springs 22 and 23 absorb and absorb the impact when the pedal 4 is strongly depressed, thereby preventing the rotary variable resistor 21 from being destroyed. Furthermore, the structure is simplified, the number of parts is small, and the pair of leaf springs 22, 2
By integrally forming 3, the number of parts can be further reduced. Further, since the rotary variable resistor 21 can be a commercially available product, it has advantages such as being inexpensive and having excellent durability.

FIG. 5 is a side view of essential parts showing another embodiment of this invention. In this embodiment, a slide type variable resistor 40 is provided in place of the rotary type variable resistor, corresponding to a pair of leaf springs 22, 23, and its operator 41 is connected to a connecting portion between the leaf springs 22, 23. It is held at the tip of the connecting member 42 disposed at A. The rotation shaft 26 constitutes a mere pivot point for the case 27, and the other configurations are the same as in the above embodiment.

It is clear that the same effects as in the above embodiment can be obtained also in such a configuration.

FIGS. 6 and 7 are a perspective view and a side sectional view of a main part showing another embodiment of the invention. The pedal 4 has a horizontal shaft 50 disposed at its rear end.
This shaft 50 is rotatably held by a U-shaped groove 52 of a bracket 51 disposed on the bottom plate, and a stopper fitting 53 (not shown in FIG. 7).
This prevents it from coming off upwards. Further, the pedal 4 is given the tendency to return upward by a spring (not shown) disposed on the bottom plate, and is normally held substantially horizontally by the tip thereof coming into contact with the upper edge of the pedal window 6.

The musical tone control electric component 21 (musical tone control element) disposed corresponding to the pin 20 of the pedal 4 consists of a rotary variable resistor, similar to the embodiment shown in FIGS. 2 and 3. The rotating shaft 26 is non-rotatably fixed to the bracket 25 and remains parallel to the pin 20. The musical tone control electric component 21 includes a pair of upper and lower wire springs 55,
56 are arranged. These wire springs 5
5 and 56 are formed by bending one wire spring into a substantially U-shape, similar to the embodiments shown in FIGS. It is attached to the electrical component 21, and its connecting portion 57 is inserted into an insertion hole of a holding portion 58 protruding from the back surface of the electrical component 21. The upper wire spring 55 is not fixed to the electric part 21, and its tip extends forward and is pressed into contact with the pin 20 from above, so that the electric part 21 is normally connected to the electric part 21.
The electrical component 21 is suspended in a state floating above the upper surface of the electrical component 21, and movement in the left and right direction is restricted by a pair of stoppers 59 and 60 protruding from the upper surface of the electrical component 21, and upward displacement is restricted by a stopper 61. Therefore, it is regulated. On the other hand, the lower wire spring 56 is locked by a pair of front and rear hook-shaped locking pieces 62 and 63 provided on the lower surface of the electrical component 21, so that
The distal end portion, which is in close contact with the lower surface of the electric component 21 and extends forward, is pressed against the lower surface of the stopper 30, so that it is located within the downward movement region of the pin 20 and is spaced apart from the pin 20 by an appropriate distance Δd. is seperated.
In this case, the length l ₁ from the tip of the upper wire spring 55 to the stopper 61 is set longer than the length l ₂ from the tip of the lower wire spring 56 to the hook-shaped locking piece 62. The spring constant is smaller than that of the lower wire spring 56.

In this configuration, when the pedal 4 is gradually depressed, the upper wire spring 55 for causing the pin 20 to descend together with the pedal 4 returns to elasticity, as shown in FIG. 8a, and when the pedal 4 is depressed at a certain angle, It contacts the top surface of the electrical component 21. At this time, the pin 20 also contacts the lower wire spring 56. When the pedal 4 is further depressed from this state, the pin 20 pushes down the lower wire spring 56, causing the electrical component 21 to rotate counterclockwise around the rotating shaft 26, as shown in FIG. 8b. Ru. As a result, the resistance value of the electric component 21 changes depending on the depth of depression of the pedal 4, so the volume of the musical tone changes, and it is possible to obtain a performance sound full of rhythmic and realistic feeling.

Note that the pair of wire springs 5 according to this embodiment
5, 56 are a pair of leaf springs 22, 2 shown in FIG.
Of course, it may be used instead of 3.

In addition, in all of the above embodiments, the drive section of the pedal 4 is configured with the pin 20, but this invention is not limited to this, and it is also possible to use a part of the pedal 4 itself as the drive section, in which case a pair of pins 20 are used. The elastic member may be orthogonal to the longitudinal direction of the pedal 4, and the rotating shaft 26 may be arranged parallel to the pedal 4.

[Effect of idea]

As explained above, the pedal device for an electronic musical instrument according to the present invention is provided with a driving section in the pedal, a musical tone control element that controls the musical tone by changing the resistance value corresponding to the pedal, and on the rotation axis of the pedal device. A pair of elastic members, the lower side having a larger spring constant than the upper side, are disposed so as to sandwich the drive section and face each other vertically, and when the pedal is depressed, the drive section pushes down the lower elastic member to Since it is configured to drive the musical tone control element, the structure is simple and the volume can be changed according to the amount of pedal depression.
You can enjoy a rhythmic and realistic performance. Further, since the lower elastic member is positioned at a distance below the drive part to give the pedal some play, it can be made similar to a general piano pedal. Further, since the pair of elastic members absorbs and absorbs the impact when the pedal is depressed, the practical effects thereof are very large, such as preventing damage to the resistor.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of a conventional pedal device, Fig. 2 is a perspective view showing an embodiment of this invention, Fig. 3 is a side sectional view of the main part, and Figs. Figure 5 is a side sectional view of a main part showing another embodiment of the invention, and Figures 6 and 7 are perspective views showing still other embodiments of the invention. The main part side sectional views and FIGS. 8a and 8b are diagrams for explaining the operation. 4...Pedal, 20...Pin (resistor drive section),
21... Rotating variable resistor, 22... Upper leaf spring, 23... Lower leaf spring, 26... Rotating shaft, 3
0... Stopper, 55, 56... Wire spring.

Claims (1)

[Claims for Utility Model Registration] (1) A pedal having a driving part, a pair of elastic members disposed on a rotating shaft so as to sandwich the driving part and facing each other vertically, and a pedal that is arranged on a rotating shaft so as to be vertically opposed to each other with the driving part in between, and the upper elastic member of the pair of elastic members is in pressure contact with the driving section, and the lower elastic member is in pressure contact with the drive section. has a larger spring constant than the upper elastic member, is located within the downward movement region of the drive unit and is in pressure contact with the stopper, and is pressed down by the drive unit when the pedal is depressed at a certain angle; A pedal device for an electronic musical instrument, characterized in that it drives the musical tone control element. (2) The pedal device for an electronic musical instrument according to claim 1, wherein the musical tone control element is a variable resistor.