JPH0738106B2 - Electronic musical instrument keyboard lid open / close mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard lid opening / closing mechanism for opening / closing a keyboard portion in an electronic musical instrument such as an electronic organ or an electronic piano.

[Outline of Invention]

According to the present invention, in a keyboard lid opening / closing mechanism for an electronic musical instrument, the instrument body and the vicinity of the rear end portion of the keyboard lid are rotatably connected by a link member, respectively, and from a position at which the link member of the keyboard lid is pivotally supported. A guide contact portion is provided at a position separated by a predetermined distance, and when the keyboard lid is opened and closed, the guide contact portion is formed of at least two different curved surfaces of a guide member fixedly provided in the instrument main body. By making it move while always contacting the guide part, the gap between the keyboard lid and the front end of the top plate of the instrument main body is minimized and the rear part of the keyboard lid needs to be stored in the instrument body. The moving space can be reduced.

[Conventional technology]

An electronic musical instrument having a keyboard such as an electronic organ is generally provided with a keyboard lid that covers and protects the keyboard when not in use.

The keyboard lid is slidable in the front-back direction of the instrument body, and is a slide-type lid body that is housed in the instrument body when the lid is opened, and is rotatably arranged in the up-down direction. There are two types of rotary lids that stand upright on the instrument body when the lid is closed.

However, since the former slide type lid is formed into an armor-like shape by flexibly connecting a large number of lid constituent members in series, the structure is complicated and the number of parts is large, resulting in high manufacturing cost. There's a problem.

On the other hand, the latter rotary lid can be manufactured at a low cost because it may be a single plate-shaped lid, and since it is erected on the instrument body when the lid is opened, a storage space is provided inside the instrument body. It has the advantage that it does not have to be secured.

However, if the keyboard is more than two steps above and below, the depth of the keyboard lid increases and the weight of the keyboard lid increases, making it difficult to open and close it. There was a risk of pinching.

In addition, since the area becomes large when the depth dimension is large, there is a problem that the player feels a sense of pressure when the lid is erected on the instrument body when the lid is opened.

Therefore, in order to improve the problems in such a rotatable keyboard lid, the present applicant has previously described that the pivot fulcrum of the keyboard lid is covered as described in JP-A-63-11995. Provided at a certain distance from the rear end of the body to the front and below the lower surface,
We have developed a device in which the rear end of the keyboard lid is stored in the instrument body through an opening provided on the upper surface of the instrument body when the lid is opened.

An example of the mechanism will be briefly described with reference to FIG. 9. A rotatable keyboard lid 3 is provided above a keyboard portion 2 arranged in the front portion of the musical instrument body 1 and fixed to the rear end portion thereof. The first and second links 5a, 5b that form a four-bar rotary link 5 between the triangular support member 4 and the fixed portion that serves as a rotation fulcrum in the instrument body 1.
Are pivoted by pins 6a, 6b, 7a, 7b, respectively.

Then, when the front end portion of the keyboard lid 3 is lifted from the closed position shown by the solid line and rotated in the arrow P direction, the rear end of the keyboard lid 3 moves along the locus shown by the one-dot chain line L, and the rear portion of the keyboard lid 3 is moved. Is stored in the musical instrument body 1, and the lid is opened as shown by a virtual line.

According to this keyboard lid opening / closing mechanism, the keyboard lid 3 is opened / closed at the time of opening / closing operation.
Since the torque due to its own weight acts in the opposite direction before and after the rotation fulcrum, it can be opened and closed lightly by proper balance, and there is no sudden closing.

Further, since the rear portion of the keyboard lid 3 is housed in the musical instrument body 1 when the lid is opened, the player's feeling of pressure is reduced.

[Problems to be Solved by the Invention]

However, in such a conventional keyboard lid opening / closing mechanism,
Since a four-bar rotation link is used to rotate the keyboard lid, there is little freedom in the path of rotation, and the keyboard lid 3 moves as shown in FIG. The gap S between the top plate (top plate) 1a of 1 and the front end (point A) is widened,
Objects may fall inside.

Therefore, as shown in FIG. 9, a large dust cover 8 is provided, and the top plate 1a is rotated in the direction of the arrow Q with respect to the back plate 1b so that it can be easily taken out when an object falls there. There is a problem in that it is necessary to movably attach the hinges so that the upper portion of the musical instrument body 1 can be opened.

Also, the use of the four-bar rotary link requires a large space for pivoting the rear portion of the keyboard lid 3 inside the instrument body 1 as shown in FIG. 9, and other parts such as FIG. )
There is also a problem that the mounting space of the transformer 9 shown in FIG.

The present invention has been made in view of such problems, and in the above-described rotary keyboard lid opening / closing mechanism,
The degree of freedom of the rotational trajectory of the keyboard lid is increased so that the keyboard lid can always move close to the front end of the top plate of the musical instrument main body during opening and closing to minimize the above-mentioned gap S, and also within the musical instrument main body. It is an object of the present invention to make it possible to reduce the turning space at the rear of the keyboard lid.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an electronic musical instrument including a keyboard lid that pivots with respect to a musical instrument body to open and close a keyboard portion. Part pivotally supported near the rear end of the keyboard lid, and a guide abutment provided at a position a predetermined distance to the rear end side from the position where the link member of the keyboard lid is pivotally supported. Department,
A guide member that is fixed in the main body of the musical instrument and that moves the guide contact portion while always contacting it when the keyboard lid is opened and closed, and the guide member has a first guide portion having at least two different curved surfaces; When the guide contact part has a second guide part and the guide contact part is in contact with the first guide part, the keyboard cover rotates about a position where the link member pivotally supports the link member, and the guide contact part moves. Provided is a keyboard lid opening / closing mechanism configured such that, when in contact with the second guide portion, the keyboard lid rotates about a position where the instrument body pivotally supports the link member.

[Action]

In the keyboard lid opening / closing mechanism according to the present invention, the guide contact portion provided at the position away from the link member pivotal position toward the rear end side when the keyboard lid is opened / closed is fixed in the instrument body. The guide member moves while being in contact with the first and second guide portions formed of at least two different curved surfaces.

Then, when the guide contact portion is in contact with the first guide portion, the keyboard lid rotates about the position where the link member pivotally supports, and the guide contact portion contacts the second guide portion. During this time, the keyboard lid rotates about the position where the instrument body pivotally supports the link member.

Therefore, the rotational trajectory of the keyboard lid can be freely designed by the curved shape of each guide portion of the guide member and the pivotal support position of the link member by the keyboard lid and the instrument body.

For example, as shown in FIG. 10 (B), the keyboard lid 3 can be always rotated along the front end (point A) of the top plate of the musical instrument body to minimize the gap S.

As a result, a large dust cover and a mechanism for opening and closing the top plate are not required, so that the cost can be reduced.

In addition, compared with the case of using a four-bar rotary link, it is possible to reduce the turning space required to store the rear part of the keyboard lid in the instrument body by the same amount, and other parts,
For example, it becomes easy to secure a mounting space for the transformer 9 shown in FIG.

〔Example〕

An embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 8.

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

2 shows a state in which the keyboard lid starts to open with a solid line, and shows a state in which the keyboard lid is opened slightly larger than the horizontal with a phantom line, and FIG. The states of the two positions are shown by virtual lines.

The electronic musical instrument of this embodiment has a keyboard lid 13 for the musical instrument body 11.
Is openably and closably supported, and when not in use, the keyboard lid 13 is closed to cover and protect the upper and lower two keyboards 12A and 12B.

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

At the rear end of the keyboard lid 13, a doglegged arm member 14 is fixedly mounted, and a roller 15 as a guide contact member is rotatably attached to it by a shaft 16.

On the other hand, a bracket 17 is fixedly installed in the musical instrument main body 11, and one end of an L-shaped lever 18 which is a link member is rotatably supported by a shaft 19 and the other end of the lever 19 is shaped like a dogleg. A shaft 20 is rotatably supported by a shaft 20 at the center of the arm member 14.

Further, a bar receiving portion is provided outside the middle portion (bending portion) of the lever 18.
18a is formed, and a torsion bar 21 is attached between the bar receiving portion 18a and the rear end of the keyboard lid 13.

Further, on the shelf plate 11b of the musical instrument body 11, a roller guide 22 which is a guide member forming a guide rail surface 22a for guiding the roller 15 is fixed.

Reference numeral 11a is a top plate of the musical instrument body 11, 11c is a side plate, 11d is a mouth stick, and 11e is a back plate.

And, there is a space between the lower edge of the top plate 11a and the upper edge of the back plate 11e.
24 is formed, and inside thereof, there is provided a falling object discharge panel 23 having an inclined surface that descends toward the back surface from a position close to the locus of the rear end of the keyboard lid 13.

Reference numeral 25 is an operation panel for arranging various key switches and the like, and 26 is a music score receiver. Further, a transformer 27, which is a mounting component, is arranged on the rear shelf plate 11b in the musical instrument body 11.

Next, the construction of the keyboard lid 13 and the main part of the opening / closing mechanism of this embodiment will be described in more detail with reference to FIGS.

As shown in FIG. 3, the keyboard lid 13 is composed of a first lid member 131 made of transparent resin, such as acrylic, which constitutes the front half portion, and a second lid member 132, which is made of metal such as aluminum and constitutes the latter half portion.
It consists of

Then, in the joint portion of the second lid member 132 with the first lid member 131, along the longitudinal direction (key arrangement direction), there is a channel-shaped strip holding portion 132a, and two strip-shaped holding portions 132a are provided on both sides thereof. The pressing protrusions 132b, 132c and the L-shaped locking piece 132d for restricting the rear end position of the first lid member 131 are integrally formed.

Into the channel-shaped band plate holding portion 132a, a band-shaped plate 133 in which cylindrical screw receiving members 134 (female threads are cut) are fixed at intervals in the longitudinal direction by caulking or the like is inserted and held. Then, the through hole formed in the vicinity of the rear end of the first lid member 131 is fitted into the screw receiving member 134, and the upper surface thereof is projected 1
The rear end faces of 32b and 132c are brought into contact with the L-shaped locking sides 132d, respectively.

Then, the entire length of the rear end portion of the first lid member 131 and the L-shaped locking side 132d is pressed by the L-shaped pressing member 135, and the set screw 1
36 to the screw receiving member 134, and set screw 137 to L
Each of the shape locking sides 132d is fixed with a screw.

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

Further, a resin finger hook member 138 and a cushion material 139 are attached to the front edge portion of the first lid member 131.

A bent portion 132e is provided at a rear end portion of the second lid member 132, an L-shaped locking portion 132f is provided in front of the bent portion 132e, and a contact portion also serving as a reinforcement on both sides thereof.
132g and 132h are formed respectively, and the bent portion 132e
A dogleg-shaped arm member 14 is locked between the locking portion 132f and the locking portion 132f, as shown in FIG.

That is, the claw portion 14c formed on the lower surface of the one arm portion 14a of the dogleg-shaped arm member 14 near the tip member is hooked to the locking portion 132f, and is inserted into the screw hole provided in the bent portion 132e. Screw 28
Is screwed into the tap hole of the other arm portion 14b of the dogleg-shaped arm member 14 and tightened, whereby it is pulled and firmly fixed in the direction of arrow B.

A pair of roller support pieces 1 is provided on the lower surface of the arm portion 14b of the doglegged arm member 14.
4d is a fixed shaft that supports roller 15 rotatably on it.
Holds both ends of 16.

The roller 15 rolls and moves on the guide rail surface 22a of the roller guide 22 shown in FIG.

The roller guide 22 is integrally molded of synthetic resin, and actually has a lightening shape as shown in FIGS. 1 and 2 in order to save material and prevent sink marks, but in FIG. It is shown in the figure.

On the other hand, the side plate 11c is provided with the armor metal fitting 29 forming the lower case together with the shelf plate 11b, the mouthpiece 1d, and the back plate 11e of the musical instrument body 1 shown in FIG.
And the upper inclined surface 29a as shown in FIG.
Channel-shaped bracket 17 is fixedly installed on the.

A shaft 19 having a torsion coil spring 30 inserted therein is rotatably supported between both side walls 17a, 17b of the bracket 17, and one end of the shaft 19 (the other end is supported by the shaft 20). (A shaft-supported member is centrally supported on the V-shaped arm member 14) and a spring locking plate 31 having a notch groove 31a is fixed to the other end. The stop plate 31 is fitted and locked in the notch groove 31a, and the other end is fitted and locked in the notch groove 17c formed in one side wall 17a of the bracket 17.

A stopper pin 32 is provided on the side wall 17a of the bracket 17 so that the stopper recess 18b engages with the stopper pin 32 at the rotation limit position when the lever 18 turns left from the position shown in FIG. Therefore, the rotation is blocked.

The torsion coil spring 30 is in a neutral state when the lever 18 is rotated halfway, and is further wound to the left to be wound up to generate a restoring force in the right-handed direction, and when the lever 18 is turned to the right from the intermediate position, it is unwound. It is designed to generate a return force in the left-handed direction.

Therefore, when the lever 18 at the time of opening the lid shown in FIG. 4 is turned to the right, the maximum return force in the counterclockwise direction is generated, which pushes the keyboard lid 13 up against its own weight. Since it acts as the torque of, it is possible to reduce the operation force from the outside required to start closing.

Further, as shown in FIG. 5, the torsion bar 21 is composed of an intermediate portion 21b and both end portions 21c which are symmetrically formed in a crank shape with a central convex portion 21a as a center, and both end portions 21c have projections for preventing slipping out. 21d is pressed.

Then, the four positions of the intermediate portion 21b shown by the broken line in FIG. 5 are attached to the bent portion 132e of the second lid member 132 of the keyboard lid 13 by the attachment fittings 33 as shown in FIG. Convex part 21a
Is abutted on the inner surface of the second lid member 132, and both end portions 21c are fitted and locked to the bar receiving portions 18a of the levers 18 on the left and right sides, respectively, and are prevented from coming off by the protrusions 21d on both sides thereof.

The torsion angle α shown in FIG. 5 of the torsion bar 21 is 28 degrees in the standard state, but since the opening / closing operation of the keyboard lid 13 changes the angle formed by the lever 18 and the second lid member 132. , About 80 degrees in the closed state and about 48 degrees in the opened state, whereby the turning torque applied between the keyboard lid 13 and the lever 18 changes.

FIG. 6 is a perspective view of the musical instrument main body 11 with a part of the musical instrument main body 11 cut away with the keyboard lid 13 closed, as seen from an obliquely upper side. The relationship between the face plate 11e, the keyboard lid 13 and the falling object discharge panel 23 is clearly shown.

An arrow-shaped cushioning member 34 formed of soft resin is fitted to the front edge of the top plate 11a.

Next, the operation of this embodiment will be described.

At the time of opening the lid, the keyboard lid 13 is completely closed, and the finger hook member 138 at the front end thereof is put on the finger and lifted up to the second position.
The position P1 shown in the figure is set, and further the position P2 in the figure and the positions P3 and P4 in FIG.

In the meantime, the roller 15 is fixed to the guide rail surface 22 of the roller guide 22.
Always transfer to a and move. This guide rail surface 22a can be designed quite freely, but it has a first guide part and a second guide part consisting of at least two different curved surfaces.

Between the positions P1 and P2 shown in FIG. 2, the roller 15 is in rolling contact with the small curved surface which is the first guide portion above the guide rail surface 22a, and during this time, the lever 18 is stopped by the stopper pin.
It engages with 32 and is locked at the upper limit position and does not rotate, and only the doglegged arm member 14 pivots rightward around the shaft 20 together with the keyboard lid 13 in FIG.

Therefore, the outer surface of the second lid member 132 of the keyboard lid 13 is
The top plate 11a is rotated at a position extremely close to the cushioning member 34 at the front end.

Further, at the position P1 at the beginning of opening, the torsion bar 21 attached between the bar receiving portion 18 of the lever 18 and the keyboard lid 13 shown by the solid line makes an angle of about 100 degrees, so that the twist angle is The torque is about 80 degrees, and the keyboard bar 13 gives a relatively large rotational torque in the opening direction to the closing bar 21 due to its own weight in the closing direction. Therefore, the keyboard lid 13 can be lifted relatively lightly.

After that, as the keyboard lid 13 opens, the doglegged arm member 14
2 rotates rightward with respect to the lever 18 in FIG. 2, the torsion angle of the torsion bar 21 becomes smaller, but the torque in the left-handed direction due to the weight of the keyboard lid 13 also becomes smaller, so that the balance is maintained.

Furthermore, at the position P3 in FIG.
When it reaches the protrusion of a and then moves to the large curved surface which is the second guide section below, the lever 18 moves the keyboard lid around the shaft 19 as shown in the figure.
The second lid member 132 of the keyboard lid 13 that turns right with 13
However, it begins to be housed in the musical instrument body 1 through the gap between the rear end of the musical score receiver 26 and the cushioning member 34 at the front end of the top plate 11a.

At this time, the restoring force of the torsion coil spring 30 shown in FIG. 4 acts in the direction in which the keyboard lid 13 is pulled in, so that the keyboard bar 13 is smoothly accommodated in combination with the action of the torsion bar 21.

Then, in the state of position P4 in FIG. 1, the torsion bar 21 returns to the standard state in which the twist angle is 28 degrees and no bias force is generated, and the torsion coil spring 30 in FIG. 4 is also in the neutral state and pulling force acts. Although it disappears, the keyboard lid 13 rotates clockwise due to the turning force of its own weight and descends.

As a result, the torsion angle of the torsion bar 21 increases again to generate a braking force, and the torsion coil spring 30 is also unwound to generate a braking force that gradually increases with respect to the clockwise rotation of the lever 18, so that the keyboard lid 13 rapidly increases. Without falling, the roller 15 smoothly descends while rolling on the guide rail surface 22a, and finally reaches the open position P5 shown by the solid line in FIG.

Meanwhile, the guide rail surface 22a regulates the movement trajectory of the keyboard lid 13 so that the outer surface of the second lid member 132 of the keyboard lid 13 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 a score, a piece of paper, a clip, or the like may get inside the instrument body 11 from a slight gap between them.
Even if such a situation occurs, it slides down on the fallen object discharge panel 23 as shown by the arrow in FIGS. 1 and 6, and from the gap 24 between the top plate 11a and the back plate 11e. It is discharged to the outside.

Therefore, it is not necessary to provide a large dust cover or rotate the top plate 11a each time to open the upper part of the musical instrument body 11 and take out a fallen object as in the conventional case.

Further, since the rotation trajectory of the rear end portion of the keyboard lid 13 in the instrument body 11 can be regulated by the roller guide 22, the space required for the rotation can be made smaller than before, and the transformer 27 or the like can be mounted. It is easy to secure the installation space for parts.

In addition, in FIGS. 1 and 2, the transformer 27 is a roller.
Seems to protrude into the movement path of 15, but the keyboard lid 13
Since the opening and closing mechanisms other than the above are provided only on both sides of the musical instrument body 11, they do not interfere unless they protrude into the movement path of the rear end of the keyboard lid 13.

When the keyboard lid 13 is closed, the tip of the keyboard lid 13 at the lid opening position P5 in FIG. 1 is grasped, and the keyboard lid 13 is pulled upward while being lifted upward. From positions P4 to P3 in FIG. 1, and from position P2 in FIG.
It should be rotated through P1.

In this embodiment, a restoring force acts on the keyboard lid 13 at the open position and the closed position according to the opening / closing operation, and the restoring force becomes zero at the intermediate position, that is, the elastic body having different elastic modulus, that is, the torsion bar 21. And a torsion coil spring 30 are installed, and the keyboard lid 13
Since I tried to balance the turning power by the self-weight of
The operating force required for opening and closing can be made almost uniform at any of the open position, the closed position, and the intermediate position.

In addition, at least the keyboard lid 13 is provided by the torsion bar 21.
A strong restoring force can be applied near the closed position of 1
It is easy to apply a uniform restoring force on both sides by the book torsion bar.

Assuming that the torsion angles of the torsion bar 21 at the time of closing the lid, opening the lid, and the intermediate thereof are α ₁ , α ₂ , and α ₃ , respectively, α ₁ = 80 °, α ₂ = 48 °, and α ₂ = 48 ° in the above-described embodiment. It was set so that α ₃ = 28 °, but the setting is not limited to this.
It can be arbitrarily set if the condition of α ₁ > α ₂ > α ₃ is satisfied.

By the way, in the above-described embodiment, as a means for keeping the roller 15 as the guide contact portion always in contact with the guide rail surface 22a of the roller guide 22 as the guide member during the opening / closing operation of the keyboard cover 13, The rear end portion or the front end portion of the top plate 11a played its role, but another embodiment of the present invention in which this means is changed will be described with reference to FIGS. 7 and 8.

In FIGS. 7 and 8, parts corresponding to the respective parts in FIG. 4 of the above-described embodiment are designated by the same reference numerals, and description thereof will be omitted.

In this embodiment, an auxiliary roller 37 is rotatably attached to a U-shaped roller support piece 14d fixed to a member similar to the doglegged arm member 14 of FIG. 4 by the same shaft 36 as the roller 15. The shaft is supported, and it is attached to the arm bracket 29 on the guide rail surface 22a of the roller guide 22.
It is inserted in the guide slot 29b formed along the above and is brought into rolling contact with the upper and lower inner peripheral surfaces thereof.

As shown in FIG. 8, the auxiliary roller 37 is provided with a shaft 36 through a plurality of balls 38 which are prevented from coming off by screwing cylindrical screws 39.
The shaft 36 passes through the auxiliary roller 37, the cylindrical screw 39, the roller support piece 14d, and the roller 15, and is secured by screwing the flat screw 40.

According to this embodiment, during the opening / closing operation of the keyboard lid, the auxiliary roller
Although 37 moves while rolling in the guide slot 29b of the armor metal fitting 29, the center of the 37 is always regulated at a position separated from the guide rail surface 22a by the radius of the roller 15, so that the roller 15 is always guided by the guide rail surface 22a. Can be brought into contact with.

Other configurations and operations are similar to those of the above-described embodiment.

Further, although not shown, the guide rail portion of the roller guide is formed in a U-shaped cross section, and the roller 15 is supported in a cantilever manner and fitted therein, so that the guide rail portion is always in contact with the guide rail portion. Good.

Alternatively, the guide rail surface of the roller guide may be made of a magnetic material (for example, iron) and the roller may be a magnet roller.

〔The invention's effect〕

As described above, the keyboard lid opening / closing mechanism of the electronic musical instrument according to the present invention is configured by the curved shapes of the first and second guide portions of the guide member and the pivotal support position of the link member by the keyboard lid and the instrument body. The rotational trajectory of the keyboard lid can be freely designed, and the keyboard lid can always be rotated along the front end of the top plate of the instrument body to minimize the gap.

As a result, a large dust cover and a mechanism for opening and closing the top plate are not required, so that the cost can be reduced.

Also, when the keyboard lid is opened, the rear part is housed in the instrument body to reduce the height when the lid is opened, reducing the feeling of pressure on the player, and for that purpose, the keyboard lid inside the instrument body is necessary. The rotation space at the rear end can be reduced,
Therefore, it becomes easy to secure a mounting space for other components.

[Brief description of drawings]

1 and 2 are side views showing the interior of an electronic musical instrument which is an embodiment of the present invention, except for the parts necessary for explaining the keyboard lid opening / closing mechanism, and FIG. 3 is the configuration of the keyboard lid. FIG. 4 is a perspective view showing the main part of the keyboard lid opening / closing mechanism, FIG. 5 is a perspective view of the torsion bar 21 in FIG. 4, and FIG. 6 shows the keyboard lid 13 in a closed state. FIG. 7 is a perspective view of a musical instrument main body 11 which is partially broken and seen obliquely from above, FIG. 7 is a perspective view showing only a main part of another embodiment of the present invention, FIG. 8 is a sectional view thereof, and FIG. Is a cross-sectional view of a musical instrument body showing an example of a keyboard lid opening / closing mechanism of a conventional electronic musical instrument, and FIGS. 10 (a) and (b) show movements of the keyboard lid when opening / closing the keyboard lid opening / closing mechanism according to the conventional example and the present invention. FIG. 11 ... Instrument body, 11a ... Top plate, 11b ... Shelf plate 11c ... Side plate, 11d ... Mouth bar, 11e ... Back plate 13 ... Keyboard lid, 14 ... V-shaped arm member 15 ... Roller (guide contact member) 18 ... Lever (link member) 19 ... Shaft (rotation fulcrum), 21 ... Torsion bar 22 ... Roller guide (guide member) 22a ... Guide rail surface 23 ... Falling object discharge panel, 24 ... Void 27 ... Transformer (mounting component) 29 ... Arms Metal fitting, 29b ... Guide slot 30 ... Torsion coil spring, 37 ... Auxiliary roller 131 ... First lid member, 132 ... Second lid member

Claims (1)

[Claims] 1. An electronic musical instrument having a keyboard lid which opens and closes a keyboard portion by rotating with respect to a musical instrument body, wherein one end is rotatably supported by the musical instrument body and the other end is the keyboard lid. A link member pivotally supported near the rear end portion, and a guide contact portion provided at a position apart from the position of the keyboard lid that pivotally supports the link member to the rear end portion by a predetermined distance, A first guide fixed to the instrument body and configured to move the guide abutting portion while always contacting the same when the keyboard lid is opened and closed, wherein the guide member has at least two different curved surfaces. And a second guide portion, and when the guide abutting portion is in contact with the first guide portion, the keyboard lid rotates about a position that pivotally supports the link member, When the guide contact portion is in contact with the second guide portion, Fallboard closing mechanism, characterized in that the keyboard lid is configured to rotate about the position of the instrument body for rotatably supporting the link member.