JPS59113496A - Expression pedal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an expression pedal that outputs an electric signal in response to a foot pedal operation.

[Prior art]

Conventionally, when adjusting the volume of a musical tone while playing an electronic musical instrument, etc., an expression pedal is used, and the foot plate of the expression pedal is rotated by foot operation. The volume is adjusted by rotating the adjustment shaft of the volume switch.

An expression pedal used in such an electronic musical instrument has a configuration as shown in FIG. 1, for example.

In other words, this type of expression pedal is operated by pressing the foot, and when the foot tread plate 3 is rotated in the direction of the arrow X around the nine rotation axis 2 provided on the pedal base 1, the foot tread plate 3 is rotated in the direction of the arrow X. The vertically movable arm 4 provided on the lower surface moves up and down, and along with this vertical movement, the bottle 4a provided at the lower end of the vertically movable arm 4 moves along the elongated hole 5a of the rotating arm 5. As a result, the rotating arm 5 rotates around the adjusting shaft 6a of the volume switch 6 provided on the pedal stand 1, and at the same time, the rotating arm 5 rotates around the adjusting shaft 6a of the volume switch 6 provided on the pedal stand 1. Rotate it to change the resistance value of the volume switch 6. In this way, when the resistance value of the volume switch 6 changes, the volume switch 6 will change its resistance value, and the expression pedal will not operate even if you take your foot off the foot plate 3. @VC to any desired position so that 3 does not move uncontrollably.
It is provided with brake means 7 for holding. This brake means 7 has one end of a leaf spring 8 supported by a protrusion l& projecting on the pedal base 1 disposed below the rotation shaft 2 of the foot plate 3, and the other end of the leaf spring 8 supported on the pedal base 1. 9) attached to the plate spring 8, and elastically presses one end of the leaf spring 8 against the rotating shaft 2. This pressing is done by force and holds the foot pedal @3 in an arbitrary position. It looks like this.

[Problems with conventional technology]

However, in the expression pedal as described above, the volume switch 6 is normally operated approximately - 300 degrees, and its characteristics (overall change in resistance value)
However, in general, the movement of the foot is ergonomically limited to about 20 degrees at most, so the range of rotation of the foot plate 30 is correspondingly small. The rotation range of the volume switch 6 is also small, and only a portion of the overall resistance value change of the volume switch 6 can be obtained, which has the disadvantage that the control speed of the output volume is limited.

In other words, in the expression pedal described above, the brake means 7 that holds the foot plate 3 at an arbitrary position only elastically presses the rotating shaft 2 with the leaf spring 8; On the other hand, when the plate spring 8 is in a state close to a line contact, the contact area is small, and since a load is always applied to this small contact area, there is a drawback that durability is reduced.

Furthermore, although there is a difference in the pressing force of the foot plate 3 between adults and children, the braking means 7 has a constant holding force of the foot plate 3, so that it can be applied to operators with different pressing forces. , there was an inconvenience that the same stepping force was required.

[Purpose of the invention]

This invention has been made in consideration of the above circumstances, and provides an expression pedal that can narrow the variable range of the switch means even if the range of foot pedal operation is small, and at the same time provides an expression pedal with reduced durability. The expression peg/
14: To provide.

[Key points of the invention]

In order to achieve the above object, the present invention uses a gear mechanism to amplify the amount of rotation of the footboard rotated by a single foot pedal operation, thereby increasing the variable range of the switch means.

Further, in the present invention, the gear mechanism for amplifying the amount of rotation of the foot plate includes a drive gear that rotates with the foot plate, and an intermediate gear that meshes with the drive gear and rotates amplified. The brake means is provided with a friction plate that presses against the side surface of the gear to hold the foot plate at a desired position, and further includes a brake means that applies the pressure contact force of the friction plate that presses against the side surface of the intermediate wheels. Therefore, I have tried to give instructions as appropriate.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. The figure shows an expression pedal, which includes a pedal base 10,
In this pedal stand 10, a rack is provided with a shaft 11 and a shaft 1.
A foot plate 12 attached to the foot plate 1 and rotated by foot operation; a gear mechanism 13 that amplifies the rotation f of the foot plate 120; and a switch means 14 for outputting an electric signal.

The upper H pedal stand 10 is composed of a left side stand member 15 and a right side stand member 16 which are divided into two parts symmetrically. Each of these platform members 15 has a substantially trapezoidal box shape, and is formed into a hollow shape with open sides facing each other.The upper part of each of the base members 15 on the front side forms an inclined surface, and the upper end of this inclined surface Notches 15a and 16a are formed to face each other, and the upper part of each rear side forms a flat surface that is lowered by one step, and openings 15b and 16b are formed in this flat surface to face each other. . In addition, cylindrical support portions 17.18 are formed on the inner side walls of each of the base members 15.16 to face each other.

The shaft 11 has bushings l7a at both ends thereof.

18a is removed and this bushing 17a% 18a
are fitted into the support portions 17, 18 of each of the table members 15, 16, and the rack is placed within the flat table 10.

A foot pedal 12 is attached to the shaft 11 and moves W1 when the foot is pressed. That is, this foot plate 12i is a rectangular flat plate, and two support arms 12a, 12a are formed on the lower surface of the foot plate 12i on the near side.
5.16 is inserted upward through the notches 15a and 16a, and the inserted lower end is connected to the upper g upper shaft 11.
It is rotatably supported. As a result, the upper foot tread 12 is disposed above the pedal base 10, and is configured to rotate in the direction of arrow Y (see Fig. 3) about the shaft 11 when the foot is operated. , and the support arm 12a
, 12a, the support arm 12arQ located on the right side
,, is arranged between a bush 18a attached to the shaft 11 and a washer 19a, and is held between an EIJ ring 19b. On the other hand, the support arm 12a located on the left side
is pressed against the left bush 17a by a coil spring 20 attached to the shaft 11. As a result, the footboard 12 is held securely so that it does not move laterally.

Also, a gear mechanism 1 that amplifies the amount of rotation of the foot plate 12 is provided.
3 is a drive gear 21 that rotates with the footboard 12;
It has an intermediate gear 22 which is amplified and rotated by this driving gear 21, and a driven gear 23 which is rotated by this intermediate gear 22 and operates the volume switch 14a of the switch means 14. A friction plate 24 made of nylon or the like is pressed against the foot plate 1.
2 is provided with a brake device 25 for holding it at an arbitrary position.

That is, the drive gear 21 extends upward and connects the foot plate 12.
a connecting portion 21b having a concave portion 21a into which a convex portion 12b formed on the lower surface fits; and a gear portion 21d extending obliquely downward and having a large number of teeth 21c on an arc-shaped portion at the tip.
It is rotatably attached to the shaft 11. Washers 21e and 21e attached to the shaft 11 are arranged on both sides of the drive gear 21, respectively.The washer 21e on the right side is fixed by an E-ring 21f, and the washer 21e on the left side is fixed to the E-ring 21f. It is pressed by the coil spring 20 mentioned above and is pressed against the drive gear 21. Thereby, the drive gear 21 is held so as not to move laterally.

The intermediate gear 22 is composed of a small gear 22a that meshes with the drive gear 21 and rotates, and a large gear 22b that rotates together with the small gear 22a, and a frame is provided between each platform member 15 and 16. It is rotatably attached to the intermediate shaft 26. In this case, the upper shaft 26 is inserted from the side of the left base member 15 and protrudes to the side of the right base member 16, and the nut 27 is screwed into this protruding threaded portion 26b. By tightening, the left and right base members 15.
Further, the driven gear 23 rotates by meshing with the intermediate gear 220 and the large gear 22bK, and is attached to the adjustment shaft 14b of the volume switch 14a. It is designed to rotate.

By the way, each gear 21.22a, 2 of the gear mechanism 13
The relationship between 2b and 23 is as follows. That is, the number of teeth of each gear 21, 22 a, 22 b, 23 is &
When s bs b2, e, the gear ratio X between the drive gear 21 and the pinion gear 22a is a/b, 1 (a>b, The ratio y is
b2/c (bt≧c, b2≧bt). In this case, the number of teeth a of the driving gear 21 is not the number of teeth of the gear portion 21d shown in FIG. This is the number of virtual teeth provided on the entire circumferential circle. Therefore, when the rotation angle of the foot plate 120 is 60, ? The rotation angle θ of the volume switch 14a is expressed by the formula: θ=θ, xa/b1 xb, /c=θ6 XxXy, which is the rotation angle θ of the footboard 12. Against?
The rotation angle θ of the volume switch 14a is xy (=ab
, /b1c) is set to be approximately 15 times larger. For example, the rotation angle θ of the footboard 12. When the temperature is about 20 degrees, the volume switch 14
The rotation angle θ of a is set to approximately 300 degrees.

On the other hand, the volume switch 14a outputs an electric signal according to the amount of rotation of the adjustment shaft 14b that rotates together with the driven gear 23, and is attached to a mounting plate 28 as shown in FIG. There is. This mounting plate 28 is a flat plate bent into a substantially rLJ shape, and one end thereof is held by the intermediate shaft 26, and the other end is attached to the left base member 15. Further, connection lines 29, 29 and a connection cord 30 are connected to the volume switch 14a, the connection line 29, 29 is connected to the main volume switch 14c, and the connection cord 30 is connected to an electronic musical instrument (not shown). It is now connected. The main volume switch 14c is used to preset the volume of the electronic musical instrument, and is connected to the openings 15b and 1 of each base member 15.16.
6b, and is attached to a name plate fitting 31 mounted in the left side base member 15. The adjustment shaft 14d of the main volume switch 14c is connected to the 1 name plate fitting 31 so as to close the openings 15b and 16b.
It passes through the name plate 32 attached to the plate and protrudes upward.
A knob 14e is attached to this protruding portion.

Furthermore, the brake device 25 that holds the footboard 12 at an arbitrary position includes disk-shaped friction plates 24.24 arranged on both sides of the intermediate gear 22, and the friction plates 24.24 are connected to the intermediate gear 22. The structure includes a coil spring 33 that is brought into pressure contact with each side surface, and an adjustment device 34 that adjusts the pressure contact force of the friction force 24, 24 caused by the coil spring 33. That is, each of the friction plates 24, 24 is attached to the intermediate shaft 26, and the right friction plate 24 is attached to the E-ring 35b via the mounting plate 28 and washer 35a of the volume switch 14a. Fixed.

Further, the left friction plate 24 is pressed against the left side surface of the intermediate gear 22 via a washer 33a by a coil spring 33 attached to the intermediate shaft 26. Accordingly, each of the friction plates 24, 24 is pressed against both side surfaces of the intermediate gear 22, and brakes the rotation of the intermediate gear 220. Also, upper 6C
As shown in FIG.
It consists of a cylindrical body 36 that is attached to the 6K rotation p1 function and suppresses the left side of the coil spring 33, and a collar part 37 that is formed at the left end of this cylindrical body 36 and rotates the cylindrical body 36, A bonito 1-1 male thread 36a is formed on the outer layer of the body 36. Further, the cylindrical body 36 is screwed onto the base side 15, and is tightened by the head 26a of the central shaft 26 and the nut 27 to be fixed at an appropriate position. The pressing force of the contacting coil genera 33 is adjusted to adjust the depression of the foot plate 12.

It should be noted that on the lower surface of the base members 15 and 16, a rubber member 38 for a low-cost rubber member 38 is attached. ...
... is installed.

Next, we will discuss the case of using an exsolation pedal configured as shown above.

In this case, first connect the main volume switch 14aVci to the electronic musical instrument (not shown) with the connection cord 30 connected to the volume switch 14aVci, and also connect the main volume switch 14c to the volume switch 14aVci in advance. Set the electronic musical instrument so that musical tones at a predetermined volume are produced.

Furthermore, since the force with which the foot treadle 12 is pressed is strangely different between adult and child performers, and the force with which the foot is pressed is also different depending on each performer, the adjustment device 34 of the brake device 25 is
Operate to adjust the pressing force to suit you. That is, in the adjusting device 34 shown in FIG. 4, first, the nut 27 at the right end of the intermediate shaft 26 is turned to release the cylindrical body 36 from the fixed position 7, and then the collar 37 is turned by hand to release the cylindrical body 36. 36 is rotated and placed at an appropriate position 91, the pressing force of the cylindrical body 36 against the coil spring 33 changes, and accordingly the coil spring 33 pushes the friction plates 24, 24 against the intermediate gear 2.
The pressing force applied to both sides of 2 changes.

This allows the performer to obtain a pressing force on the footboard 12 that suits him/her. Note that when the desired depressing force is obtained, tighten the nut 27 again.
When playing an electronic musical instrument with the cylindrical body 36 in the state of the left base member 1 and wishing to control the volume of musical tones during the performance, the foot plate 12 may be appropriately rotated by a foot operation. Then, the drive gear 21 of the gear mechanism 13 rotates about the shaft 11 together with the footboard 12, and the rotation is transmitted to the pinion 22a of the intermediate gear 22, causing the pinion 22a to rotate. In this way, when the small gear 22a rotates, the large gear 22b rotates together with the small gear 22a, and this rotation is transmitted to the driven gear 23, so that the driven gear 23 can be amplified and rotated, and the adjustment shaft of the volume switch 14a 14b is amplified and rotated. When the adjustment shaft 14b rotates in this way,
The resistance value of the volume switch 14a changes depending on its rotation angle, and the change in resistance value, the resistance, and the foot pedal plate 12
An electric signal W is output to the electronic musical instrument via the connection cord 30 according to the rotation angle (depression fin).

This controls the volume of musical tones produced by the electronic musical instrument.

In addition, with the foot plate 12 depressed as described above,
Even if the foot is removed from the foot plate 12, the foot plate 12 is held in that state by the brake device 25. This means that each friction plate 24.24 of the brake device 25 is connected to a coil spring 33.
This is because it is in pressure contact with both side surfaces of the intermediate gear 22.

However, according to the expression pedal as described above, the slight amount of rotation of the foot plate 12 (rotation angle of about 20 degrees) is amplified by the gear mechanism 13, thereby widening the variable range of the volume switch 14a. Therefore, the characteristics of the volume switch 14a (overall resistance value change)
You can make the most of it and have good volume control.

'J'c, -t: In the expression pedal, each friction plate 24, 24 of the brake device 25 is in pressure contact with both sides of the intermediate gear 22, and holds the foot plate 12 at an arbitrary position. Therefore, the contact area of the friction plates 24, 24 is large, and the footboard 12 can be held securely and well, and the footboard 12 is also excellent in durability. In this case, since the brake device 25 is particularly provided on the intermediate shaft 26, there is no need to increase the pressing force that presses the friction plates 24, 24 against both sides of the intermediate gear 220, and this reduces the adjustment, durability, etc. It is rational at a point.

Furthermore, the expression pedal is equipped with an adjustment device 34 that adjusts the pressure contact force of the friction plates 24, 24 that are in pressure contact with both sides of the intermediate gear 220, so that, for example, the depression force of the foot plate 12 can be adjusted by adults and children. Even in cases where the pressure is different, the pressing force of the foot plate 12 can be adjusted appropriately according to each operator, and therefore there is no problem of requiring operators with different pressing forces to press the same foot.

Furthermore, in the above expression pedal, the -6 dull stand 10 can be assembled by combining the two left and right stand members 15 and 16 using one intermediate shaft 26, so the assembly work is extremely simple, and It can be done easily.

〔Effect of the invention〕

As explained above, according to the expression pedal of the present invention, the amount of rotation of the rotating foot plate is amplified by the gear mechanism when the foot is operated, and the switch means is operated by the amplified amount of rotation. Therefore, even if the range of foot operation is small, the variable range of the switch means can be widened.

Furthermore, the expression pedal is equipped with a brake means in which a friction plate is pressed into contact with the side surface of the intermediate gear of the gear mechanism, so that the foot plate can be held securely and well at any desired position. Since the pressing force can be appropriately adjusted by the adjusting means, operators with different pressing forces are not required to apply the same pressing force, resulting in excellent operability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional expression pedal, Fig. 2 is an exploded perspective view of the expression pedal of the present invention, Fig. 3 is a side view of the assembled state with main parts cut away, and Fig. 4 is a cross-sectional view of a conventional expression pedal. FIG. 2 is a partially cutaway side view of the brake device. 10...Pedal stand, 11...Axis,"l
2... Foot plate, 13... Gear mechanism, 14a..., j? IJ neem switch, 1
5.16... Base member, 21... Drive gear, 22... Intermediate gear, 24... Friction plate, 25... Brake Device, 26...
Intermediate shaft, 34. Old adjustment device. Figure 1 A4 ＼ Thorn ゛5 668- ′-Tayyu 毫b

Claims (4)

[Claims] (1) A footplate that is attached to the pedal base via a shaft and rotates when the foot is operated, a gear mechanism that amplifies the amount of rotation of the footplate, and a rotation amplified by the gear mechanism. An expression pedal comprising a switch means for outputting an electric signal according to the amount of movement. (2) The gear mechanism has a drive gear that rotates with the foot plate, and an intermediate gear that is amplified and rotated by the drive gear, and a friction plate is pressed against the side surface of the intermediate gear. A brake means is provided to hold the footplate in any position. An expression pedal according to claim 1, characterized in that: (3) The expression pedal according to claim 2, wherein the brake means includes an adjustment means for adjusting the pressing force of the friction plate that presses against the side surface of the intermediate gear. (4) The dull stand is divided into two parts, left and right, and has one intermediate shaft to which the intermediate gear of the gear mechanism is attached.
The expression pedal according to claim 2, wherein the expression pedal is assembled.