JPH03269575A - Keyboard musical instrument - Google Patents

Abstract

PURPOSE:To safely and smoothly open/close a keyboard cover with uniform light operating force by providing such auxiliary force generating means that an auxiliary force is applied to the keyboard cover to be turned toward the opened position when the keyboard is at the closed position and toward the closed position at the opened position and the auxiliary force becomes zero at a prescribed position between the closed position and the opened position. CONSTITUTION:This instrument is provided with such auxiliary force generating means 21 and 30 that the auxiliary force is applied to the keyboard cover 13 so as to be turned to the opened position at the closed position and to the closed position at the opened position and the auxiliary force becomes zero at the prescribed position between the closed position and the opened position. Therefore, when the keyboard cover 13 is opened/closed, the force applied from the auxiliary force generating means 21 and 30 balanced with the rotary force caused by the dead weight of the keyboard cover 13 and the operation force which is required for the entire process of the opening/closing operation of the keyboard instrument 13 becomes almost uniform. Thus, the keyboard cover 13 can be safely and smoothly opened/closed with the uniform light operation force.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to various keyboard instruments equipped with a single-turn type keyboard lid, including electronic keyboard instruments such as electronic organs and electronic pianos, and in particular, to Concerning technology for smooth opening and closing.

[Summary of the invention]

This invention provides a keyboard instrument equipped with a keyboard lid that opens and closes a keyboard section by rotating with respect to the instrument body, in which the keyboard lid is opened in the direction of the open position when the keyboard lid is in the closed position in response to the opening/closing operation of the keyboard lid. By providing an auxiliary force generating means that applies an auxiliary force to rotate the keyboard lid in the direction of the closed position at a predetermined position between the closed position and the open position, the auxiliary force generating means acts to rotate the keyboard lid in the direction of the closed position. The operating force is almost uniform at all positions when opening and closing.

[Conventional technology]

For electronic instruments with keyboards such as electronic organs.

Generally, a keyboard lid is provided to cover and protect the keyboard section when not in use.

The keyboard lid consists of a sliding lid that is slidable in the front-rear direction of the instrument body and stored inside the instrument body when the lid is opened, and a sliding lid that is rotatable vertically and opened. There are two types of rotary lids that are installed upright on the instrument body when the lid is closed.

However, the former sliding type lid is formed into a shutter-like shape by connecting a large number of lid components in a series in a flexible manner, so the structure is complex and the number of parts is large, resulting in high manufacturing costs. There's a problem.

On the other hand, the latter rotary lid can be manufactured at a low cost because it only requires two plate-shaped lids, and because it stands upright on the instrument body when the lid is opened, it saves storage space inside the instrument body. It has the advantage that it does not need to be secured.

However, when the depth of the keyboard lid increases and its weight increases, as in the case of electronic musical instruments with two keyboards, not only does it become difficult to open and close, but the center of gravity shifts and the keyboard lid suddenly falls when opening and closing. There was a risk that he might get his hands tied.

Therefore, as seen in Japanese Utility Model Publication No. 62-46219, for example, when the keyboard lid is closed, a braking mechanism using a spring absorbs and cushions the rotational force due to its own weight in the latter half of the rotation. be.

Further, when the depth dimension of the keyboard lid is large, its area also becomes large, which gives a feeling of pressure to the player when the keyboard lid is placed upright on the main body of the musical instrument when the lid is opened.

Therefore, as seen in Japanese Patent Application Laid-open No. 63-11995, for example, the pivot point of the keyboard lid is provided at a position a certain distance from the rear end of the lid body forward and below the bottom surface, and when the lid is opened, the pivot point of the keyboard lid is In addition to ensuring that the rear end is stored within the instrument body,
A keyboard lid has also been developed that allows for relatively light opening and closing operations due to the weight balance between the front and back of the rotational fulcrum, and does not close suddenly and pinch your fingers.

[Problem to be solved by the invention]

However, with such a conventional keyboard lid opening/closing mechanism,
In either case, the main emphasis was placed on safety when closing the keyboard lid, and little consideration was given to mitigating the impact when opening the keyboard lid.

As a result, the required operating force changes considerably during the entire process of opening and closing the keyboard lid, and there are cases where it is not always possible to open and close the keyboard lid smoothly and with good operability.

This invention was made in view of these points,
In a keyboard instrument equipped with a rotating keyboard lid as described above, the operating force required for opening and closing the keyboard lid is approximately the same throughout the entire process of opening and closing the keyboard lid, so that the opening and closing of the keyboard lid can be performed with a uniform and light operating force. The aim is to make it possible to do so safely and smoothly.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a keyboard instrument equipped with a keyboard lid that opens and closes a keyboard section by rotating with respect to the main body of the instrument. An auxiliary force generating means acts to rotate the keyboard lid in the direction of the open position, and in the open position, the auxiliary force acts to rotate the keyboard lid in the direction of the closed position, and the auxiliary force becomes zero at a predetermined position between the closed position and the open position. It has been established.

[For production]

Due to the above-described structure of the keyboard instrument according to the present invention, when the keyboard lid is opened and closed, the acting force of the auxiliary force generating means and the turning force due to the keyboard lid's own weight are balanced, and the operating force is almost the same throughout the entire stroke, making it safe. The keyboard lid can be opened and closed easily and smoothly.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 are side views showing the interior of an electronic keyboard instrument according to an embodiment of the present invention, with parts other than those necessary for explaining the keyboard lid opening/closing mechanism thereof omitted.

Figure 2 shows the state in which the keyboard lid has begun to open with a solid line, and the state in which it is opened slightly wider than horizontal with an imaginary line. The states of the two positions are shown by imaginary lines, respectively.

In the electronic keyboard instrument of this embodiment, a keyboard lid 13 is supported on the musical instrument main body 11 so as to be openable and closable, and by closing the keyboard lid 13 when not in use, an upper keyboard 12A and a lower keyboard 12B are arranged. can be covered and protected.

The illustrated keyboard lid opening/closing mechanism is provided on both sides of the instrument body 11.

A doglegged arm member 14 is fixed to the rear end of the keyboard lid 13, and a roller 15 is rotatably attached to it by a shaft 16.

On the other hand, a bracket 17 is fixedly installed inside the instrument body 11, and one end of an L-shaped lever 18, which is a link member, is connected to the shaft 1.
The other end of the lever 19 is rotatably supported by a shaft 20 at the center of the dog-legged arm member 14.

Further, a bar receiving portion 18a is formed on the outside of the intermediate portion (bending portion) of the lever 18, and the bar receiving portion 18a and the keyboard 111 are connected to each other.
A torsion bar 21, which is a first auxiliary blade generating means, is engaged between the rear end of the blade 3 and the rear end of the blade 3.

Furthermore, a roller guide 22 that forms a guide rail surface 22a for guiding the roller 15 is fixed on the shelf board 11b of the musical instrument body 11.

11a is the top plate of the instrument body 11, and 11c is the side plate.

Lid is the 0 rod, and 11e is the back plate.

A gap 24 is formed between the lower edge of the top plate 11a and the upper edge of the back plate lie, and inside the gap 24 there is an inclination that descends from a position close to the trajectory of the rear end of the keyboard lid 13 toward the back surface. A fallen object discharge panel 23 forming a surface is provided.

25 is an operation panel on which various key switches etc. are arranged, 26
is a music tray. Further, a transformer 27, which is a mounted component, is disposed above the shelf board 1 at the rear of the musical instrument body 11.

Next, the structure of the keyboard lid 13 and the main parts of its opening/closing mechanism in this embodiment will be explained in more detail with reference to FIGS. 3 to 5.

As clearly shown in FIG. 3, the keyboard lid 13 consists of a first M member 131 made of transparent resin, such as acrylic, constituting the front half, and a second lid member 132 made of metal, for example, aluminum, constituting the rear half. .

At the joint between the second lid member 132 and the second lid member 131, there is a channel-shaped strip holding portion 132a along the longitudinal direction (fil arrangement direction), and two strip holding portions 132a spaced apart from each other on both sides thereof. Presser foot protrusion 132b.

132c, and an L that regulates the rear end position of the first lid member 131.
A shape stopper 132d is integrally formed.

Into the channel-shaped strip holding portion 132a, strip plates 133, in which cylindrical screw receiver members 134 (@threaded) are fixed by caulking or the like, are inserted and held at intervals in the longitudinal direction. , the screw receiver member 134 is fitted into the through hole formed near the rear end of the first lid member 131, and its upper surface is brought into contact with the protrusions 132b and 132c, and the rear end surface is brought into contact with the L-shaped body retaining piece 132d, respectively. let

Then, the rear end portion of the first M member 131 and the I5 type locking piece 13
The entire length of 2 cl is held down by an L-shaped holding member 135, and the screw receiver is screwed and fixed to the member 134 by a set screw 136, and to the L-shaped body retaining piece 132d by a set screw 137, respectively.

Therefore, the first M member 131 and the second lid member 132 are firmly connected without any set screws or the like appearing on the upper surface side of the keyboard lid 13.

Furthermore, a finger rest member 138 and a cushion material 139 made of resin are attached to the front end edge of the first lid member 131.

A bent portion 132e is formed at the rear end of the second lid member 132, an L-shaped locking portion 132f is formed in front of the bent portion 132e, and abutment portions 132g and 132h which also serve as reinforcement are formed on both sides of the bent portion 132e. As shown in FIG. 4, a doglegged arm member 14 is locked between the bent portion 132e and the locking portion 132f.

That is, the claw portion 14c formed on the lower surface near the tip of one arm portion 14a of the doglegged arm member 14 is connected to the locking portion 132f.
The set screw 28 inserted into the screw hole provided in the bent portion 132e is inserted into the other arm portion 14b of the doglegged arm member 14.
By screwing it into the tapped hole and tightening it, the arrow B
Pull it in the direction to firmly fix it.

A pair of roller support pieces 14d are fixed to the lower surface of the arm portion 14b of the doglegged arm member 14, and hold both ends of a shaft 16 that rotatably supports the roller 15.

This roller 15 moves in rolling contact with the guide rail surface 22a of the roller guide 22 shown in FIG.

The roller guide 22 is integrally molded from synthetic resin, and actually has a hollow shape as shown in Figures 1 and 2 in order to save material and prevent sinking, but in Figure 4 it is simplified and shown as a block. It is illustrated in the figure.

On the other hand, the shelf board 11b of the musical instrument main body 1 in FIG.

The arm bracket 29, which together with the back plate 1d constitutes the lower case, is provided integrally with the side plate 11c, and as shown in FIG.
7 is permanently installed.

And both side walls 17a of this bracket 17.

A shaft 19 fitted with a torsion coil spring 30 is rotatably supported between the shafts 17b, and one end of the lever 18 is attached to one end of the shaft 19 (the other end is pivotally supported by the shaft 20 at the center of the doglegged arm member 14). At the same time, a spring locking plate 31 having a notched groove 31a is fixed to the other end, and one end of the torsion recoil spring 30 is fitted into the notched groove 31a of this spring locking plate 31. The other end of the bracket 17 is fitted into a cutout groove 17c formed in one side wall 17a of the bracket 17 to be locked.

Also, a stopper pin 3 is provided on the side wall 17a of the bracket 17.
2 is provided in a protruding manner, and when the lever 18 rotates to the left from the position shown in FIG.
8b engages with this stopper pin 32, and its rotation is prevented.

The torsion coil spring 30 is a second auxiliary force generating means,
When the lever 18 rotates halfway, it becomes neutral (auxiliary force is zero), and when it rotates further to the left, it is wound up and generates a return force (auxiliary force) in the clockwise direction, and the lever 18 rotates clockwise from the intermediate position. Then, it is rewound to generate a return force (auxiliary force) in the left rotation direction.

Therefore, when the lever 18 is turned most clockwise when the lid is opened, as shown in FIG. 4, the maximum assisting force in the left rotation direction is generated, which is the torque that pushes up the keyboard lid 13 against its own weight. Therefore, the operating force required from the outside to start closing can be reduced.

On the other hand, the torsion bar 21 which is the first auxiliary force generating means
As shown in FIG. 5, it consists of an intermediate portion 21b and both end portions 21c, which are formed in a crank shape symmetrically around a central convex portion 21a, and both end portions 21c are provided with protrusions 2 for preventing removal.
1d is pressed.

Then, as shown in FIG. 4, the intermediate portion 21b is attached to the bent portion 132e of the second lid member 132 of the keyboard lid 13 at four positions indicated by broken lines in FIG.
The central protrusion 21a is brought into contact with the inner surface of the second lid member 132, and the bar receivers of the levers 18 on both the left and right sides are fitted into and locked with the bar receivers 18a on both sides, and the protrusions 21 on both sides
Stop the removal with d.

The torsion angle α shown in FIG. 5 of this torsion bar 21 is:
In the standard state, the angle is 28 degrees, but as the angle between the lever 18 and the second lid member 132 changes depending on the opening/closing operation of the keyboard lid 13, the angle is approximately 80 degrees when the lid is closed and approximately 48 degrees when the lid is open. The auxiliary force applied between the keyboard lid 13 and the lever 18 changes depending on the return force.

FIG. 6 is a perspective view of the musical instrument main body 11 partially cut away and viewed diagonally from above with the keyboard lid 13 closed. The relationship between the face plate lie, the keyboard lid 13, and the fallen object discharge panel 23 is clearly shown.

An arrow-shaped buffer member 34 made of soft resin is fitted onto the front edge of the top plate 11a.

Next, the operation of this embodiment will be explained.

When the lid is opened, the keyboard L! 13 from the completely closed state, put your finger on the finger hook member 138 at the front end and lift it upward to position P1 shown in FIG. 2, and then to position P2.
Position P3 in FIG. P4 and then the lid open position P5.

During this time, the roller 15 moves in constant rolling contact with the guide rail surface 22a of the roller guide 22. This guide rail surface 22a can be designed quite freely, but in this embodiment, it has two curved surfaces, large and small.

Between positions P and P2 shown in FIG. 2, the roller 15 is in rolling contact with the small curved surface above the guide rail surface 22a, and during this time the lever 18 engages with the stopper pin 32 and is at the upper limit position. The doglegged arm member 14 is locked and does not rotate.
The chisel rotates to the right in FIG. 2 about the shaft 20 together with the keyboard lid 13.

Therefore, the keyboard lid 13 rotates at a position where the outer surface of the second lid member 132 is very close to the buffer member 34 at the front end of the top plate 11a.

In addition, at the opening start position P1, the lever 18 shown by the solid line
In the bar holder, the angle formed by the torsion bar 21 hooked between the part 18 and the keyboard lid 13 is approximately 100 degrees, so the torsion angle is approximately 80 degrees, and the keyboard lid 13 is held under its own weight. The auxiliary force of the torsion bar 21 provides a relatively large rotational torque in the opening direction compared to the rotational torque in the closing direction. Therefore, the keyboard lid 13 can be lifted relatively lightly.

Thereafter, as the keyboard lid 13 opens, the doglegged arm member 14 rotates to the right relative to the lever 18 as shown in FIG.
Since the torque in the counterclockwise direction due to its own weight is also reduced, balance can be achieved.

Furthermore, when the roller 15 reaches the protrusion of the guide rail surface 22a at position P3 in FIG. 2
The lid member 132 begins to be stored in the instrument body 11 through the gap between the rear end of the music tray 26 and the buffer member 34 at the front end of the top plate 11a.

At this time, the auxiliary force from the torsion coil spring 30 shown in FIG. 4 acts in the direction of pulling the keyboard lid 13, so that, in combination with the action of the torsion bar 21, the keyboard lid 13 is smoothly retracted.

Then, in the state of position P4 in Fig. 1, the torsion bar 2
1 returns to the standard state with a torsion angle of 28 degrees and no longer produces a return force (auxiliary force), and the torsion coil spring 30 shown in Figure 4 also enters a neutral state with zero return force (auxiliary force), so a retraction force is applied. However, the keyboard lid 13 rotates to the right due to the rotational force due to its own weight and descends.

As a result, the torsion angle of the torsion bar 21 increases again, and its auxiliary force acts in the direction of opening the SI lid 13, producing a braking force.The torsion coil spring 30 is also wound back, and the auxiliary force acts on the lever 18. Keyboard lid 1 against right rotation
3 to generate an auxiliary force or braking force that gradually increases in the direction of opening.

The keyboard lid 13 does not fall suddenly, and descends smoothly while rolling the roller 15 against the guide rail surface 22a, and finally reaches the opening position P5 shown by the solid line in FIG. 1.

During this time, the movement locus of the keyboard lid 13 is regulated by the guide rail surface 22a so that the outer surface of the second upper lid member 132 always moves close to the buffer member 34.

Therefore, the gap between the buffer member 34 and the keyboard lid 13 can be made extremely small.

Even so, there is a risk that musical scores, pieces of paper, paper clips, etc. may get into the instrument body 11 through the small gaps between them, but even if such a thing were to occur, it would be difficult to avoid it as indicated by the arrows in Figures 1 and 6. Then, the object slides down on the falling object ejection panel 23 and falls into the gap 24 between the top plate 11a and the back plate 11e.
is discharged to the outside.

Therefore, by installing a large dust cover or by rotating the top plate 11a to open the top of the instrument body 11,
There is no need to take out fallen objects.

In addition, since the rotation locus of the rear end of the keyboard lid 13 within the instrument body 11 can be regulated by the roller guide 22, the space required for the rotation can be reduced compared to the conventional one.
It becomes easy to secure installation space for mounted components such as the transformer 27.

In FIGS. 1 and 2, the transformer 27 appears to protrude into the moving path of the roller 15, but the opening/closing mechanism other than the keyboard lid 13 is provided only on both sides of the instrument body 11. If it does not protrude into the movement path of the rear end of the keyboard lid 13, it will not interfere.

To close the keyboard lid 13, grasp the tip of the keyboard lid 13 at the opening position P5 in FIG. It is sufficient to rotate from position P4 to P3 in FIG. 1 and further from position P2 to Pl in FIG.

In this embodiment, in response to the opening/closing operation of the keyboard lid 13, an auxiliary force acts to rotate the keyboard lid 13 toward the open position in the closed position and toward the closed position in the open position. As an auxiliary force generating means in which the auxiliary force becomes zero at a predetermined position in between, two types of elastic bodies with different elastic moduli, namely a torsion bar 21 and a torsion coil spring 30, are provided, and the rotational force due to the weight of the keyboard lid 13 and the balance are provided. Since the opening and closing operations are made to take the same amount, the operating force required for opening and closing can be made almost the same at any of the open position, the closed position, and the intermediate position.

Further, the torsion bar 21 can apply a strong auxiliary force in the direction of the rotation position at least near the closed position of the keyboard lid 13, and it is also easy to apply an equal auxiliary force on both sides with a single torsion bar. This simplifies the configuration.

The torsion angle of the torsion bar 21 when the lid is closed, when the lid is opened, and at a predetermined position in between is α1. α
2. Assuming α3, the following relationship was set in the above-mentioned embodiment, α,=80', α2=48
', α3=28, but not limited to α1〉α2〉
It can be arbitrarily set as long as the condition α3 is satisfied.

Further, in this embodiment, a torsion coil spring is used as a supplementary member for the cushioning effect of the torsion bar when the lid is opened, but a torsion recoil spring may be used as a supplementary member for the cushioning effect of the torsion bar when the lid is closed.

In addition, the torsion recoil spring may be used as a supplementary member for the buffering action of the torsion bar when opening and closing the lid, or the torsion recoil spring can be used as the main auxiliary force generating means and the torsion bar can be used to generate an auxiliary auxiliary force. Alternatively, only one of these auxiliary force generating means or another auxiliary force generating means may be used.

The present invention is applicable not only to the keyboard lid opening/closing mechanism shown in the above embodiment, but also to other rotary keyboard lid opening/closing mechanisms, and is applicable not only to electronic keyboard instruments but also to organs and upright pianos. It is also applicable to general keyboard instruments such as.

〔Effect of the invention〕

As explained above, according to the present invention, the force exerted by the auxiliary force generating means and the turning force due to the keyboard cover's own weight are balanced when the keyboard cover is opened and closed, and the operation force is almost the same throughout the entire stroke. Moreover, the keyboard lid can be opened and closed smoothly.

Therefore, it is no longer possible to get your fingers caught between the front edge of the keyboard lid and the 0-piece of the instrument body when the lid is closed, or between the outer surface of the key g1 lid and the front edge of the top plate when the lid is opened. .

[Brief explanation of drawings]

1 and 2 are side views showing the inside of an electronic keyboard instrument according to an embodiment of the present invention, with parts other than those necessary for explaining the keyboard lid opening/closing mechanism omitted, and FIG. 3 is a side view of the keyboard lid. 4 is a perspective view showing the main parts of the keyboard lid opening/closing mechanism, FIG. 5 is a perspective view of the torsion bar 21 in FIG. 4, and FIG. 6 is a diagram with the keyboard lid 13 closed. It is a perspective view of the musical instrument main body 11 partially cut away and viewed diagonally from above.

Claims (1)

[Claims] 1. In a keyboard instrument equipped with a keyboard lid that opens and closes the keyboard section by rotating with respect to the instrument body, in response to the opening and closing operation of the keyboard lid, the keyboard lid rotates in the direction of the open position when in the closed position, and in the direction of the open position when in the open position. An auxiliary force is applied to rotate the keyboard lid in the direction of the closed position,
A keyboard instrument comprising an auxiliary force generating means in which the auxiliary force becomes zero at a predetermined position between the closed position and the open position.