JPS6131359Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a pedal device for an electronic musical instrument that mechanically connects an expression device and an expression pedal.

An electronic musical instrument is played by opening and closing a key switch by operating a key to generate musical tones of a predetermined pitch. In addition, electronic musical instruments use not only keys, but also amplitude control of musical sound output from timbre circuits, etc., using, for example, the well-known expression device shown in Fig. 1, in order to add performance expression to the musical sound.
It is possible to generate performance sounds with rich playability. That is, in the same figure, 1 is an oscillator, 2 is an opening/closing circuit, 3 is a key, 4 is a tone circuit, and 5 is a light source 6.
An expression device consisting of a light receiving element 7 made of CDS or the like and a shutter 8, 9 an amplifier, 10 a speaker, and when the key 3 is pressed with a finger, the opening/closing circuit 2 corresponding to the key 3 is opened;
Thereby, the musical tone output corresponding to the key 3 from the oscillator 1 is guided to the timbre circuit 4 for timbre shaping, and then guided to the expression device 5. This expression device 5 is an expression pedal 1.
The shutter 8, which moves in conjunction with the depression operation of step 1, changes the amount of light reaching the light receiving element 7 from the light source 6, thereby changing the internal resistance of the light receiving element 7, thereby changing the musical tone output from the tone circuit 4. The amplitude (volume) is controlled according to the pedal operation, and the sound is output from a speaker 10 via an amplifier 9.

In this case, since the conventional expression device is usually installed directly on the expression pedal 11, the length of the cable that electrically connects the signal processing circuit in the musical tone body and the expression pedal 11 is limited. It is long, and therefore susceptible to external noise, which has the disadvantage of adversely affecting musical tone signals.

In addition, in so-called combo-type and desk-type electronic organs that have a space at the bottom of the instrument body, a portion of the cable is exposed outside the housing, which poses problems in terms of cable wiring and protection. In addition, it has the disadvantage of being unsightly in appearance and deteriorating the product image.

This invention was made to eliminate the above-mentioned drawbacks, and by connecting the control device that controls musical tone signals and the pedal with a mechanical connection means that has a simple structure and is easy to install, the cable The present invention provides a pedal device for an electronic musical instrument that eliminates the use of a pedal to obtain good musical sound output and improves the appearance of the instrument.The feature is that the pedal can be moved up and down. The lower ends of the stays are connected to each other, and the upper ends thereof are connected to a vertically rotatable lever, and the rotation of the lever operates a control device for controlling musical tone signals.

This invention will be explained in detail below based on the drawings.

FIG. 2 is a perspective view showing an embodiment of the pedal device for an electronic musical instrument according to this invention. In the same figure,
The expression pedal 12 is mounted on a horizontal shaft 1 so that its front and rear ends can swing up and down (arrow A).
3, the intermediate portion is supported by a bracket 14, and the bracket 14 is fixed on a rail 15. The expression pedal 12
The lower end of a stay 16, which is disposed substantially vertically and is movable up and down (in the direction of arrow C), is rotatably connected to the side of the rear end that floats upward during non-depressing operation. The stay 16 includes two stays: an expression side stay 16a and a pedal side stay 16b.
It has a split structure, and is integrally connected by screwing screw portions 17a and 17b formed at the lower and upper ends into the screw hole 18a of the turnbuckle joint 18. In this case, the threaded part 17
a and 17b are formed with different threads, that is, a left-hand thread and a right-hand thread. The upper end of the expression side stay 16a passes through an insertion hole 29 formed in a shelf board 19 constituting the main body of the musical instrument, faces into the main body of the musical instrument, and has an engaging portion 20 bent in the horizontal direction. We are prepared.

An expression frame 21 is fixed on the shelf board 19 by a set screw 22,
A rotary variable resistor 2 is mounted on one surface of this frame 21.
3 is fixed. The rotary variable resistor 23
is used as a control device for controlling musical tone signals from a tone color circuit, and one end of a lever 25 is fixed to its rotating shaft 24. This lever 25 is arranged almost horizontally, and has a long groove 26 formed in its free end extending toward the rear of the instrument body.
The engagement portion 20 of the expression side stay 16a is inserted into the elongated groove 26 and engaged with the elongated hole 27 formed in the expression frame 21 in the longitudinal direction. Note that 28 is the engaging portion 2
This is a washer attached to the tip of the 0 to prevent it from coming off.

Next, the operation of such a configuration will be explained.

When the expression pedal 12 is rotated about the shaft 13 in the direction of arrow A by pressing the foot, the stay 16 lowers in conjunction with the rotation, so that the lever 25 corresponds to the amount by which the expression pedal 12 is pressed. It rotates downward about the rotating shaft 24 by the angle. That is, the vertical swing of the expression pedal 12 is converted into the vertical rotation of the lever 25 via the stay 16, thereby displacing the rotating shaft 24 of the rotary variable resistor 23. be. As a result, the resistance value of the rotary variable resistor 23 changes, and the amplitude of the musical tone signal is controlled in accordance with the change in resistance value.

According to this configuration, it is not necessary to electrically connect the expression pedal 12 and the rotary variable resistor 23 with a cable.
There is no risk of external noise entering the expression device as in the conventional case, and only the expression pedal 12 and stay 16 are visible from the outside, so the appearance is not spoiled. Furthermore, since all the electrical systems such as the expression device are housed within the instrument body, it is not only possible to assemble and adjust the instrument itself independently of the expression pedal 12 when assembling and adjusting it. The number of connecting members is small and assembly and disassembly are easy.

Furthermore, since the upper and lower ends of the elongated hole 27 of the expression frame 21 serve to restrict the vertical movement of the stay 16, the expression pedal 12 does not require a stopper, making the structure of the pedal even simpler. There are advantages such as being able to

Further, the force applied to the stay 25 in the direction of arrow B is regulated by the width of the elongated hole 27 of the depth of the elongated groove 26, and the force applied in the direction of arrow C is regulated by the width of the elongated groove, and the force applied in the direction of arrow D is regulated by the width of the elongated groove. The force applied to the pedal (actually equal to zero since the pedal only moves up and down, but some external force may be applied) is regulated by the through hole 29 of the shelf board 19, so the force applied to the pedal is No force is applied to anything other than the rotation of the lever 25,
No extra force other than rotation is transmitted to the rotating shaft 24 of the variable resistor 23, which has the advantage of preventing damage to the variable resistor 23.

FIG. 3 is a perspective view of main parts showing another embodiment of this invention. In this embodiment, one end of the lever 25 is connected to the upper end of the expression side stay 16a via a spring pin 30, and the other end of the lever 25 is rotatably supported by a rotating shaft 24 of a rotary variable resistor 23. The rotating shaft 24 is inserted into the insertion hole of the bracket 31 fixed on the shelf board and fixed with a set screw 32, and the pin 33 protruding from the flange of the rotary variable resistor 23 is inserted into the small hole 34 of the lever 25. It is fitted and engaged with the

Therefore, with such a configuration, when the lever 25 rotates in the vertical direction about the rotating shaft 24 as the stay moves up and down, the rotary variable resistor 23 is rotated by the engagement of the pin 33 and the lever 25. Since it can be rotated and displaced relative to the rotating shaft 24, the amplitude of the musical tone signal can be controlled as in the above embodiment. Furthermore, in the above configuration, as in the above embodiment, no extra force from the stay is directly applied to the rotary shaft 24, so high strength is not required, and therefore damage to the rotary variable resistor 23 can be prevented.

In addition, although the above-mentioned embodiment explained the case where the rotary variable resistor 23 was used as a control device for musical tone signals, this invention is not limited to this in any way, and for example, as shown in FIG. Of course, a well-known expression device or a slide type variable resistor may also be used.

Furthermore, although the above embodiment has been described in terms of the case where it is used in an expression device, it may also be applied to other sound effect control devices such as sustain and vibrato installed in general electronic musical instruments.

As explained above, in the pedal device of the electronic musical instrument according to this invention, the pedal and the control device that controls musical tone signals are mechanically connected by the stay and the lever, and the cable is eliminated. can be stored and arranged within the main body of the musical instrument, which not only facilitates the assembly and adjustment of the electrical system, but also reduces the intrusion of external noise and provides good sound quality. Also, installation of stays and levers,
It is easy to disassemble, making it especially suitable for combo-type and desk-type assembled electronic organs.The upper part of the stay and lever are stored inside the instrument and are not visible from the outside, so it can improve the external appearance. The effect is very large.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a signal processing circuit in a conventional electronic musical instrument, FIG. 2 is a perspective view showing an embodiment of a pedal device for an electronic musical instrument according to this invention, and FIG. 3 is a block diagram showing an example of a signal processing circuit in a conventional electronic musical instrument. FIG. 2 is a perspective view of essential parts showing an example. 12...Expression pedal, 16...
Bracket, 23... Rotating variable resistor, 24... Rotating shaft, 25... Lever.

Claims (1)

[Scope of utility model registration request] a pedal supported swingably in the vertical direction; a stay movable up and down whose lower end is connected to the pedal; one end connected to the upper end of the stay;
1. A pedal device for an electronic musical instrument, comprising a lever that is vertically rotatable in conjunction with the vertical movement of the stay, and a control device that controls a musical tone signal in accordance with the rotation of the lever.