JPS595908Y2 - 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 an example of such a switch operating device, one having a structure as shown in FIGS. 1 to 3 is known.

That is, the tip of the lever 3, which is rotatably attached to the bottom 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 Resisting the force of the spring 5 provided between the portion 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 lever comes into contact with one of the two parts 6 provided on the lower surface of the shelf board 1, the tip 3a of this lever 3 moves the upper surface of the shelf board 1. The actuator 1 has a drive piece 9 rotatably attached to a switch support member 7 provided on the switch support member 7 via a shaft 8 and implanted at one end thereof.
0, the movable contact piece 13 of the switch 12 attached to the switch support member 7 is rotated counterclockwise in FIG.
0 is released, the switch 1 moves away from the upper fixed contact piece 14 and comes into contact with the lower fixed contact piece 15.
2 is switched on. This produces a sustain effect.

When the pressing operation on the 21 lever 3 is stopped from this state, the 21 lever 3 is rotated in the direction of arrow B by the force of the spring 5 and returns to its original hanging position. 11, the actuator 10 is rotated clockwise in FIG. 2 and returned to its original position by the force of the actuator 10.
is pushed up and brought into contact with the upper fixed contact piece 14, thereby switching the switch 12 to its original OFF state.

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 so that a part of it is connected to the other stopper member provided on the lower surface of the shelf board 1. 16, the second lever 3 is held in that position by the action of the spring 5, and the actuating piece 17 welded to a predetermined location on the second lever 3 causes the drive piece 9 to move from the bar. The switch 12 is rotated counterclockwise in FIG. 2 against the force of the spring 11, so that the switch 12 is turned on and held in the on state in the same way as in the case described above. There is.

Incidentally, this state is also a state in which the second lever 3 is stored under the shelf 1 when not in use.

However, in such a conventional switch operation device, the part that switches the switch 12 has a large number of parts, and the structure of this part is not only complicated, but also extremely troublesome to assemble. The disadvantage was that the cost increased.

In addition, since the part to which the actuating piece 17 of the twenty-one lever 3 is attached is usually nine rods with a diameter of approximately 8 mm, it is extremely difficult to weld the actuating piece 17 to these nine rods as designed. Moreover, if the welding strength is weak, there is a drawback that the actuating piece 17 may come off.

This idea was devised in view of the above circumstances.The number of parts is small, the structure is simple and easy to assemble, and there is no need for conventional welding work, resulting in an easy cost reduction. The purpose of this device is to provide a two-lever switch operating device for an electronic musical instrument that can be used to control time, and uses a leaf switch as the switch and a cam attached to a rotating shaft that is a part of the two-lever. The leaf switch is configured to be switched by the rotation of the cam in conjunction with the rotation of the second lever.

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

In the figure, reference numeral 21 denotes a shelf board for an electronic musical instrument, and a rectangular hole 22 is formed at a predetermined position of the shelf board, and a casing 23 is attached to the lower surface of the shelf board as will be described later.

The casing 23 is made of plastic or resin, and has circular holes 24 formed at a plurality of predetermined locations, and has a substantially U-shaped cross section at two predetermined locations. grooves 25, 25 are formed, respectively.

Stopper support members 26a to 26C made of synthetic resin are bonded to predetermined locations on the upper surface of the casing 23, and one stopper member 27 is attached to these stopper support members 26a to 26C by screws 28 and 26C. It is installed by...

This one stopper member 27 has a retaining surface 29 consisting of a vertical surface on the left side in FIGS. 4 and 5, and a stopper surface 30 inclined at a predetermined angle on the right side thereof.
, and further includes a pair of protruding pieces 31, 31 extending in parallel toward the right.

A buffer member 32 is bonded to the stopper surface 30 of this one stopper member 27.

Further, the other stopper member 33 made of resin is adhered to a predetermined location on the upper surface of the casing 23, and a buffer member 34 is adhered to the upper surface of this stopper member 33.

Groove 25 in the casing 23. 25 has a knee lever
A rotation shaft 36 made up of a part of the stopper member 27 is connected to both protruding pieces 31.35 of the one stopper member 27. It is rotatably fitted in contact with the lower surface of 31.

A round bar 37 is welded to a predetermined location of this rotating shaft 36 and planted so as to be perpendicular to the rotary shaft 36.
are both protruding pieces 31. of the one stopper member 27. 31
supported between them.

That is, the rotation shaft 36 of the double lever 35 is fitted into the grooves 25 of the casing 23 and prevented from moving in the left-right direction, and the rotation shaft 36 of the double lever 35 is prevented from moving in the left-right direction. The round bar 37 is prevented from moving in the vertical direction by the pieces 31 . It is rotatably attached to the casing 23 in a state in which movement in the front-back direction is prevented by being held between the two.

A spring support member 38 made of synthetic resin is adhered to a predetermined location on the upper surface of the casing 23.

The spring support member 38 has a substantially inverted U-shaped cross section, and a groove 39 having a substantially T-shaped cross section is formed on the lower surface of its upper wall, extending in the left-right direction.

This groove 39 has a spring locking member 4 having a substantially inverted Ω-shaped cross section.
0 is slidably fitted and fixed to the earthen wall of the spring support member 38 by screws 41.

A spring 4 is provided in the groove 42 of this spring locking member 40.
One hook 43a of the spring 43 is engaged with the spring 43, and the other hook 43b of the spring 43 is engaged with a groove 44 formed at the tip of the round bar 37.

Note that the spring support member 3 of the spring locking member 40
The mounting position relative to B is such that when the knee lever 35 is hung straight below the shelf board 21 as shown by the solid line in FIGS. 5 and 6, the spring 43 is approximately horizontal and the round bar 37 is This position is such that it does not act on the lever 35 at all.

A switch support member 45 made of resin is bonded to a predetermined location on the upper surface of the casing 23.

A leaf switch 46 for obtaining a sustain effect, for example, is attached to the switch support member 45 with screws 47.

This leaf switch 46 has a pair of fixed contact pieces 4B, 4
One movable contact piece 50 is provided between 9,
An actuator 51 is fixed to the lower surface of the tip of the movable contact piece 50.

A cam 52 is fitted into a predetermined portion of the rotation shaft 36 at a position corresponding to the actuator 51.

As shown in FIG. 6, the cam 52 has a protrusion 54 on a part of a disc portion 53, and a substantially semicircular protrusion 55 at the tip of the protrusion 54. There is.

When the knee lever 35 is in a position hanging straight below the shelf board 21 as shown by the solid line in FIGS. The leaf switch 46 is pushed up by the portion 54 and comes into contact with the upper fixed contact piece 48, and as a result, the leaf switch 46 is in the OFF state, and from this state the second lever 35 is turned off as will be described later.
When the is rotated in the direction of arrow C or D, the cam 52 rotates in the same direction together with the rotation shaft 36 of the lever 35, and the protrusion 54 of the cam 52 presses the actuator 51. is released, the movable contact piece 50 separates from the upper fixed contact piece 48 and comes into contact with the lower fixed contact piece 49, and accordingly the leaf switch 46 is switched to the on state. There is.

Next, a case will be described in which the unitized switch operating device as described above is attached to the shelf board 21.

In this case, each component provided on the upper surface side of the square casing 23 is inserted into the hole 22 of the shelf board 21 from below, and the engaging surface 29 of one stopper member 27 is inserted into the corresponding wall surface of the hole 22 of the shelf board 21. 22 a for positioning, and the mounting surface of the casing 23 is brought into contact with the lower surface of the shelf board 21, and then a screw (not shown) is inserted into the circular hole 24 of the casing 23 and screwed into the shelf board 21, thereby The unitized switch operating device as described above is attached to the shelf board 21.

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

Assume that the lever 35 is now in a position hanging straight below the shelf board 21, 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 35 in the direction of arrow C against the force of the spring 43 so that its round bar 37 is glued to the stopper surface 30 of one stopper member 27. When the actuator 5 is rotated until it comes into contact with the buffer member 32, that is, to the position shown by the one-dot chain line in FIGS.
1 is released, the movable contact piece 50 comes into contact with the lower fixed contact piece 49, which turns on the leaf switch 46 and provides a sustain effect.

On the other hand, when the rotation operation on the knee lever 35 is stopped from this state, the knee lever 35 is rotated in the direction of arrow D by the force of the spring 43 and returns to the original state shown by the solid line in FIGS. 5 and 6. The protrusion 54 of the cam 52 returns.
pushes up the actuator 51 and brings the movable contact piece 50 into contact with the upper fixed contact piece 4B, thereby turning off the leaf switch 46.

Next, if you want to obtain a sustain effect continuously for a certain period of time during performance, move the knee lever 35 in the direction of arrow D against the force of the spring 43 so that the round bar 37 is connected to the other stopper member 3.
When the actuator 51 is rotated until it comes into contact with the buffer member 34 bonded to the upper surface of the cam 52, that is, to the position shown by the two-dot chain line in FIGS. Then, the movable contact piece 50 is connected to the lower fixed contact piece 4.
9, thereby turning on the leaf switch 46 and producing a sustain effect.

In this state, even if the rotation operation of the knee lever 35 is stopped, the knee lever 35 is held at the position by the action of the spring 43.

Next, if you want to release this state, press the knee lever 35.
When the lever 35 is rotated in the direction of arrow C, the lever 35 is returned to its original position as shown by the solid line in FIGS. 5 and 6 by the action of the spring 43.

The state shown by the two-dot chain line in FIGS. 5 and 6 is also the state in which the lever 35 is stored under the shelf board 21 when not in use.

Further, in the above embodiment, the stopper support member 26
a to 26 C, the stopper member 33, the spring support member 3B, the switch support member 45, etc. are each glued to a predetermined location of the casing 23, but even if they are all formed into one piece with a composite resin. However, the invention is not limited to the above embodiments.

Further, in the above embodiment, one leaf switch 46 is provided for one cam 52, but the invention is not limited to this, and for example, as shown in FIG. 7, one leaf switch 46 is provided for one cam 52.
Two (or more) leaf switches 46, 46 may be provided for the second lever 35, and a plurality of cams may be provided on the rotating shaft 36 of the second lever 35, and a plurality of cams may be provided corresponding to these cams. A leaf switch may be provided for each.

Further, the shape of the cam 52 is not limited to the above embodiment.

As explained in detail above, according to the 21-lever set switch operation device for an electronic musical instrument according to this invention, a leaf switch is used as the switch, and a cam is attached to the rotating shaft that is a part of the 21-lever. Since the leaf switch is configured to be switched by the rotation of the cam in conjunction with the rotation of the two levers, the number of parts is reduced and the structure is simple and easy to assemble. Moreover, the conventional welding work is no longer necessary, and the cost can be reasonably reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a two-lever switch operation device in a conventional electronic musical instrument, and FIG. 2 is a diagram showing II of FIG.
- Longitudinal cross-sectional view along line II, Figure 3 is In-I of Figure 1.
A partially omitted vertical cross-sectional view along line I, FIG. 4 is a plan view showing an embodiment of the twenty-one lever switch operating device for an electronic musical instrument according to this invention, and FIG. 6 is a partially omitted longitudinal sectional view taken along line VI--VI in FIG. 4, and FIG. 7 is a partial plan view showing another embodiment of the invention. 21...shelf board, 23...casing,
27... Stopper member, 33... Stopper member, 35... Knee lever = 36...
・Rotation shaft, 37...Round bar, 43...Spring, 45...Switch support member, 46.
...Leaf switch, 48, 49...
Fixed contact piece, 50... Movable contact piece, 51...
- Actuator, 52...cam.

Claims (1)

[Scope of utility model registration request] A two-lever switch operating device for an electronic musical instrument in which a switch is changed by rotating a two-lever hanging from a lower side of a shelf, wherein the switch is constituted by a leaf switch, and An electronic device characterized in that a cam is attached to a rotating shaft that is a part of the 2-lever, so that the leaf switch is switched by the rotation of the cam accompanying the rotation of the 2-lever. A two-lever switch operating device for musical instruments.