JPS595902Y2 - Knee-lever switch operation device for electronic musical instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a twenty-one lever switch operating device for an electronic musical instrument.

In electronic musical instruments, an operating lever called a two-lever is provided at a position corresponding to the performer's right knee in order to be able to obtain a sustain effect at will without using the hands during performance. When the player pushes this lever in a predetermined direction with his right knee, the sustain effect switch is turned on and a sustain effect is obtained.

As such a switch operating device, one having a structure as shown in FIGS. 1 to 3 is known as an example.

That is, the second lever 3, which is rotatably attached to the lower surface of the shelf board 1 of the electronic musical instrument via the mounting brackets 2, 2, and which normally hangs below the shelf board 1 during performance, is Against the force of the spring 5 provided between the tip 3a and the spring support member 4 provided on the upper surface of the shelf board 1,
When pushed in the direction of arrow A until a part of the stopper member 6 comes into contact with one of the stopper members 6 provided on the lower surface of the shelf board 1, the two levers 3 push the switch support member 7 provided on the upper surface of the shelf board 1. The attached switch 8 is turned on and a sustain effect is obtained.

When the pressing operation on the Nileper 3 is stopped from this state, the lever 3 returns to its original hanging position by the force of the spring 5, and the switch 8 is accordingly switched to return to its original OFF state. ing.

In addition, if you want to obtain a sustain effect continuously for a certain period of time during a performance, move the lever 3 in the hanging state in the direction of arrow B to the other stopper member 9, a part of which is provided on the lower surface of the shelf board 1. When the knee lever 3 is pushed down until it comes into contact with the knee lever 3, the knee lever 3 is held in that position by the action of the spring 5, and the switch 8 is switched by the knee lever 3 and held in the on state.

Incidentally, this state is also a state in which the two levers 3 are stored under the shelf board 1 when it is inconvenient.

However, in such a conventional switch operating device, one hook 5a of the coil spring 5 is
To prevent it from coming off the tip 3a of the lever 3,
A support fitting 10 having a substantially inverted U-shaped cross section is attached to the tip 3a of the knee lever 3 with a screw 10a.
One of the hooks 5a of the coil spring 5 must be supported by the coil spring 5, and therefore the work of assembling the coil spring 5 is troublesome, the number of parts is large, and the cost is increased.

This invention was made in view of the above circumstances, and its purpose is to provide a 21-lever switch operating device for an electronic musical instrument that can incorporate a coil spring relatively easily and has a small number of parts. There is,
The hook of the coil spring is simply supported in the groove provided in the coil spring support part of the twenty-one lever to prevent it from coming off.

An embodiment of this invention will be described below with reference to FIGS. 4 to 6.

In the figure, reference numeral 11 denotes a shelf board for an electronic musical instrument, on which a rectangular hole 12 is formed at a predetermined position, and a casing 13 is attached to the lower surface of the shelf board as will be described later.

The casing 13 is made of synthetic resin, and has circular holes 14 formed at a plurality of predetermined locations, and holes 14 having a substantially U-shaped cross section at two predetermined locations. Groove 15. 15 are in their respective forms.

Stopper support members 16a to 16C made of resin are adhered to predetermined locations on the upper surface of the casing 13, and one stopper member 17 is attached to screws 18 to these stopper support members 16a to 16C.・It is installed by.

This one stopper member 17 has a retaining surface 19 consisting of a vertical surface on the left side in FIGS. 4 and 5, and a stopper surface 20 inclined at a predetermined angle on the right side thereof.
, and further includes a pair of protruding pieces 21, 21 extending in parallel toward the right.

A buffer member 22 is bonded to the stopper surface 20 of this one stopper member 17.

Further, the other stopper member 23 made of resin is bonded to a predetermined location on the top surface of the casing 13, and a buffer member 24 is bonded to the top surface of this stopper member 23.

The grooves 15, 15 of the casing 13 are provided with a knee lever 2.
A rotating shaft 26, which is a part of the stopper member 17, is rotatably fitted in contact with the lower surfaces of both the protruding pieces 21, 21 of the one stopper member 17.

A round bar 27 is welded to a predetermined location of this rotating shaft 26 and planted so as to be perpendicular to the rotary shaft 26.
are both protruding pieces 21. of the one stopper member 17. 21
supported between them.

That is, the rotation shaft 26 of the knee lever 25 is fitted into the grooves 15, 15 of the casing 13 and is prevented from moving in the left-right direction, and the rotation shaft 26 of the knee lever 25 is fitted into the grooves 15, 15 of the casing 13, and is prevented from moving in the left-right direction. ．． 21 to prevent vertical movement, and the round rod 27 is supported between both protruding pieces 21 and 21 of one stopper member 17, thereby preventing movement in the front-back direction. It is rotatably attached to the casing 13.

A spring support member 2B made of synthetic resin is adhered to a predetermined location on the upper surface of the casing 13.

The spring support member 28 has a substantially inverted U-shaped cross section, and a groove 29 having a substantially T-shaped cross section is formed on the lower surface of its upper wall and extends in the left-right direction.

This groove 29 has a spring locking member 3 having a substantially inverted Ω-shaped cross section.
0 is slidably fitted and fixed to the earthen wall of the spring support member 2B by screws 31.

A spring 3 is provided in the groove 32 of this spring locking member 30.
One hook 33a of the spring 33 is locked, and the other hook 33b of the spring 33 is locked in a groove 34 formed at the tip of the round bar 27.

Note that the spring support member 2 of the spring locking member 30
8, when the lever 25 is hung straight below the shelf board 11 as shown by the solid line in FIGS. - The position is such that it does not act on the lever 25 at all.

Further, the coil spring 33 has both hooks 33 a
, 33b are both shifted above the center line P of the coil spring 33 by a certain amount of eccentricity.

A switch support member 35 made by Gojikushi Co., Ltd. is adhered to a predetermined location on the upper surface of the casing 13.

A switch 36 for obtaining a sustain effect, for example, is attached to the switch support member 35 with a screw 37.

This switch 36 has a structure in which one movable contact piece 40 is provided between a pair of fixed contact pieces 3B and 39, and an actuator 41 is fixed to the lower surface of the tip of the movable contact piece 40. There is.

A cam 4 having a shape as shown in FIG.
2 is fitted.

When the lever 25 is in a position where it hangs straight down below the shelf board 11 as shown by the solid line in FIGS. It is pushed up and comes into contact with the upper fixed contact piece 3B, and accordingly the switch 36 is in the OFF state, and from this state, the lever 25 is moved in the direction of arrow C or D as will be described later.
When the actuator 41 is rotated in the direction, the pressure on the actuator 41 by the cam 42 is released, and the movable contact piece 40 moves toward the upper fixed contact piece 3.
8 and comes into contact with a lower fixed contact piece 39, and accordingly the switch 36 is turned on and turned on.

Next, a case will be described in which the unitized switch operating device as described above is attached to the shelf board 11.

In this case, each part provided on the upper surface side of the square casing 13 is inserted into the hole 12 of the shelf board 11 from below, and the engaging surface 19 of one stopper member 17 is inserted into the corresponding wall surface of the hole 12 of the shelf board 11. 12 a for positioning, and the mounting surface of the casing 13 is brought into contact with the lower surface of the shelf board 11, and then a screw (not shown) is inserted into the circular hole 14 of the casing 13 and screwed into the shelf board 11, thereby The unitized switch operating device as described above is attached to the shelf board 11.

Next, the operation of the switch operating device having the above structure will be explained.

Assume that the knee lever 25 is now in a position where it hangs straight down below the shelf board 11, as shown by the solid line in FIGS. 5 and 6.

If you want to temporarily obtain a sustain effect during performance, move the lever 25 in the direction of arrow C against the force of the spring 33 so that its round bar 27 is glued to the stopper surface 20 of one of the stopper members 17. When the movable contact piece 40 is rotated until it comes into contact with the buffer member 22, that is, to the position shown by the one-dot chain line in FIGS. is the lower fixed contact piece 39
As a result, the switch 36 is turned on and a sustain effect is obtained.

On the other hand, when the rotation operation of the knee lever 25 is stopped from this state, the knee lever 25 is rotated in the direction of arrow D by the force of the spring 33 and returns to the original state shown by the solid line in FIGS. 5 and 6. Accordingly, the force arm 42 pushes up the actuator 41 and brings the movable contact piece 40 into contact with the upper fixed contact piece 3B, thereby turning off the switch 36.

Next, if you want to obtain a sustain effect continuously for a certain period of time during performance, move the knee lever 25 in the direction of arrow D against the force of the spring 33 so that the round bar 27 moves toward the other stopper member 2.
When the cam 42 is rotated until it comes into contact with the buffer member 24 bonded to the upper surface of the movable contact 3, that is, to the position shown by the two-dot chain line in FIGS. The piece 40 contacts the lower fixed contact piece 39,
This turns on the switch 36 and provides a sustain effect.

Note that at this time, that is, when the 21 lever 25 is rotated in the direction of arrow D as described above, the coil spring 33 is
Since both hooks 33a and 33b, which are the supporting points, are shifted above the center line P, they are bent downward,
Then, as shown by the two-dot chain line in FIG. 5, the spring locking member 30 is bent and positioned below it.

Also, since the coil spring 33 is bent downward in this way, one of the hooks 33b is attached to the round bar 2.
Therefore, one hook 33b does not slip out of the groove 34 of the round bar 27.

In addition, as described above, when the lever 25 is rotated to the position shown by the two-dot chain line in FIG.
The center line of the rotation shaft 26 and the spring locking member 30
Since it is located below the straight line Q connecting the hook support point of
The round bar 27 is biased in the direction of arrow E by the force of the coil spring 33 trying to return to its original straight state.

Therefore, even if the rotation operation of the second lever 25 is stopped in this state, the second lever 25 is held at the position by the action of the spring 33.

Next, if you want to release this state, press the lever 25.
When the lever 25 is rotated in the direction of arrow C, the lever 25 is returned to its original position as shown by the solid line in FIGS. 5 and 6 by the action of the spring 33.

The state shown by the two-dot chain line in FIGS. 5 and 6 is also the state in which the lever 25 is stored under the shelf board 11 when not in use.

Further, in the above embodiment, the coil spring 33 is configured such that both the hooks 33 a and 33 b are shifted above the center line P, but the coil spring 33 is configured so that the hooks 33 a and 33 b are both shifted above the center line P. It may be horizontal so that one of the hooks is shifted below or above the center line P of the coil splinter 33, for example, one of the hooks is shifted above the center line P, and the other hook is horizontally shifted above the center line P of the coil splinter 33. The structure shown above may be used, and the structure is not limited to the above embodiment.

Further, in the above embodiment, the knee lever 25 is
When the coil spring 33 is rotated in a state substantially parallel to 1, the coil spring 33 is curved and positioned below the support point of the coil spring support member. It may be curved and positioned above the support point of the support member, but is not limited to the above embodiment.

Further, in the above embodiment, the stopper support member 16
2 to 16C, the stopper member 23, the spring support member 2B, the switch support member 35, etc. are respectively adhered to predetermined locations of the casing 13, but they may all be integrally formed using synthetic resin. However, the present invention is not limited to the above embodiments.

As described in detail above, according to the two-lever switch operating device for an electronic musical instrument according to the present invention, a coil spring is configured such that at least one hook of the coil spring is deviated from or below the center line of the coil spring. The hook of this coil spring is simply supported by the groove provided in the coil spring support part of the twenty-one lever, so that it does not come off, so the coil spring can be installed relatively easily. Moreover, the number of parts is small, which has the effect of making it possible to reasonably reduce costs.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of a 21-lever switch operation device in a conventional electronic musical instrument, and FIG.
- Longitudinal cross-sectional view along line II, Figure 3 is III- of Figure 1.
A partially omitted vertical cross-sectional view taken along line III, FIG. 4 is a plan view showing an embodiment of the two-lever switch operating device for an electronic musical instrument according to this invention, and FIG. FIG. 6 is a partially omitted vertical cross-sectional view taken along line VI-VI in FIG. 4. 11...shelf board, 13...casing,
16 a to 16 C... Stopper support member, 1
7...Stopper member, 23...Stopper member, 25...21 lever, 27...
・Round bar, 28...Spring support member, 30・
... Spring locking member, 33 ... Coil spring, 33a, 33b ... Hook, 3
4...Groove, 35...Switch support member, 36...Switch.

Claims (1)

[Scope of utility model registration request] The switch is switched by rotating the 21 lever hanging below the shelf board in a predetermined direction against the force of the coil spring, and the 21 lever is moved in the opposite direction to the shelf board. In the knee lever set switch operation device for an electronic chestnut chestnut machine, the two levers are held in the position by the action of the coil spring when the two levers are rotated until they are substantially parallel to each other. A groove is provided in the support member, and the coil spring is configured such that at least one hook thereof is shifted downward or upward from the center line of the coil spring, so that the Nillever is suspended below the shelf board. In this state, the coil spring is in a substantially horizontal state, and on the other hand, when the two levers are rotated from this state to a state in which it is substantially parallel to the shelf board, the coil spring is at the support point of the coil spring support member. 21. An electronic musical instrument, characterized in that both hooks of the coil spring are held by the groove and the coil spring support member, respectively, so that the hooks are bent upward or downward. Lever set switch operation device.