JP2000242271A - Keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smooth the opening and closing of a fallboard and to simplify the structure. SOLUTION: Arms 3 of this keyboard instrument are provided with guide plates 17 and guide grooves 19. Both end sides of the fallboard 14 are provided with rolls 18 profiling the guide grooves 19. At the time of opening and closing of the fallboard 14, the fallboard 14 is guided at the rear surface by the guide plates 17 and the side ends thereof are guided to the arms via the rollers 18. Then, the direct contact of the fallboard 14 with the structural parts, such as arms, at the time of opening and closing is prevented and the fallboard 14 is smoothly moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a keyboard instrument,
In particular, it relates to a keyboard instrument having a keyboard lid that can be opened and closed smoothly.

[0002]

2. Description of the Related Art A keyboard cover of a keyboard instrument such as an electronic piano or an electronic organ adopts the following opening / closing type.
FIG. 8 is a sectional view of an electronic musical instrument showing an example of the structure of a conventional keyboard cover, and FIG. 9 is a sectional view of a main part. In both figures, the arm 100 of the electronic musical instrument has a guide rail 102 for guiding the front end of the keyboard cover 101, that is, the end on the side close to the player, and the rear end of the keyboard cover 101, that is, the side far from the player. Rack 103 is fixed. A guide rail 104 for guiding the keyboard cover 101 in cooperation with the rack 103 is provided at a position offset from the rack 103 toward the arm 100.

A handle 105 made of a metal material such as aluminum is provided at the front end of the keyboard cover 101, and a pin 106 extending horizontally toward the arm 100 is provided near the lower end of the vertical portion of the handle 105. Have been. The pin 106 is engaged with the guide rail 102 to
1 to guide the front end.

An auxiliary fitting 107 is provided at the rear end of the keyboard cover 101.
The auxiliary fitting 107 is provided with a rotatable shaft 108 extending horizontally toward the arm 100, and the shaft 108 is provided with a pinion 109 and a roller 110 (FIG. 9). Pinion 109
Meshes with the rack 103, and the rollers 110 engage the guide rails 104 to guide the rear end of the keyboard cover 101, respectively.

According to this configuration, the skew of the keyboard cover 101 is regulated by the engagement between the pinion 109 and the rack 103. Therefore, if a force is applied to the keyboard instrument with the handle 105 of the keyboard cover 101 in the front-rear direction, the keyboard The lid 101 is opened and closed smoothly.

FIG. 10 is a sectional view of an electronic musical instrument showing another example of the structure of the conventional keyboard lid. In the figure, a front end guide plate 111 for guiding the front end of the keyboard cover 101 and a rear end guide plate 112 for guiding the rear end of the keyboard cover 101 are fixed to the arm 100 of the electronic musical instrument.

A handle 1 provided at the front end of the keyboard cover 101
05 are covered with resin covers 113 on both ends.
When the cover 01 is opened and closed, the resin cover 113 slides on the upper end surface of the front end guide plate 111. On the other hand, the rear end of the keyboard cover 101 slides on the end surface on the rear end guide plate 112. At the rear end of the keyboard cover 101, a stopper 115 is provided so that the keyboard cover 101 does not protrude beyond a predetermined amount in front of the keyboard instrument. The front end position of the opening / closing stroke of the keyboard cover 101 is regulated.

[0008]

8 and 9, since the skew is prevented by engagement of the rack and the pinion, the keyboard lid can be opened and closed smoothly even if a force is applied to any part of the handle. . By the way, the rack 103 and the guide rail 10
Since the number of parts is increased if the 4 is manufactured separately, it is desirable to integrally mold them. However, when the rack 103 and the guide rail 104 are integrally formed, the size (length) is fixed, so that the rack 103 and the guide rail 104 are dedicated parts for a specific model, and cannot be reused. For this reason, there is a problem that it can be adopted only for high-end models.

On the other hand, the keyboard cover shown in FIG. 10 has the advantage of a small number of parts and a simple structure. However, for example, if the cover is to be opened and closed with only one of the left and right ends, the cover is inclined. May run. Then, the corner of the keyboard lid is caught by the arm bar, and the smooth movement cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a keyboard instrument which solves the above-mentioned problems and simplifies the structure of a keyboard lid and satisfies both smoothness of opening and closing operations.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, the present invention relates to a keyboard musical instrument having a keyboard cover which is opened and closed by moving in the front-rear direction of a musical instrument body. A first guide member for guiding both side surfaces, a second guide member for supporting lower surfaces of both side surfaces of the keyboard cover, and a rolling element provided on the keyboard cover and rolling along the first guide member. There is a first feature in the point that it is provided. The present invention has a second feature in that the present invention further includes a low friction member provided between the keyboard cover and the second guide member.

Further, the present invention has a third feature in that a rolling element which rolls toward the intersection of the first guide member and the second guide member is provided on the keyboard cover. The present invention also provides a first rolling element that rolls along the first guide member,
A fourth feature is that a second rolling element that rolls along the second guide member is provided separately on the keyboard cover. Further, the present invention has a fifth feature in that the first guide member and the second guide member are realized by side walls and a lower wall of a guide groove formed in a crosspiece, respectively.

According to the above feature, when the keyboard cover is opened and closed, the lower surface of the keyboard cover is guided by the second guide member, and both side end surfaces of the keyboard cover come into contact with the first guide member via the rolling elements. You will be guided. Therefore, even when a biased force is applied when the cover is opened and closed, the cover can move smoothly without the corners and the like of the cover being caught on the arm or the like by the action of the rolling element having a small frictional resistance. it can.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an electronic piano according to one embodiment of the present invention. In FIG. 1, an electronic piano main body 1 includes a bottom plate 2, a brace 3, a back plate 4, and a mouth stick 5 vertically assembled to the bottom plate 2, and a top mounted on the brace 3 and the back plate 4. It is a box composed of the face plate 6. A side plate 7 for supporting the main body 1 is fixed to the bottom plate 2. The side plate 7 and the arm 3 are provided as a left and right pair.

A keyboard 8 and a fulcrum 9 for supporting the keyboard 8 in a swingable manner are provided inside the main body 1, and a keyboard chassis 10 for supporting the fulcrum 9 is provided. In addition to the fulcrum 9, a spring for urging the keyboard 8 upward, a switch for detecting operation of the keyboard 8, and the like (both not shown) are attached to the keyboard chassis 10. The keyboard chassis 10 is fixed to the bottom plate 2. Further, the speaker 11 is attached to the bottom plate 2 facing downward. A music stand 12 is provided on the upper part of the main body 1, that is, on the upper surface plate 6. Music stand 1
2 has a foldable stand 13 on the back. The main unit 1 has a speaker 1 in response to the operation of the keyboard 8.
Although a computer or an electric circuit for generating a sound is provided at 1, the illustration is omitted because it is not a main part of the present invention.

A keyboard cover 14 is provided above the keyboard 8. The keyboard cover 14 is engaged with the arm 3 as follows so that it can be retracted to the back of the main body 1 during performance. First, the configuration of the keyboard cover 14 will be described. A handle 15 is provided at the front end of the keyboard cover 14, that is, at the end near the mouthpiece 5. The handle 15 is desirably formed of a metal material such as aluminum. Resin covers 16 are provided on both left and right edges of the hanging portion of the handle 15. Rollers 18 for guiding the rear portion of the keyboard cover 14 along the arm 3 are provided on both left and right sides of the rear portion of the keyboard cover 14.

On the other hand, a guide plate 17 for guiding the resin cover 16 at the front end of the keyboard cover 14 is fixed to the arm 3, and the keyboard cover 14 is fixed via a roller 18 at the rear end of the keyboard cover 14. A guide groove 19 for guiding the rear end is formed. The resin cover 16 of the keyboard cover 14 slides on the guide plate 17, and the roller 18 at the rear end of the keyboard cover 14 rolls in the guide groove 19 to open and close the keyboard cover 14. That is, the open / close trajectory of the keyboard cover 14 is determined by the shape of the upper end surface of the inner operation plate 17 and the shape of the guide groove 19.

The means for guiding the side of the keyboard cover 14 along the guide groove 19 will be described in detail. Figure 2 shows the keyboard cover 1
FIG. 3 is a rear view of a main part showing engagement between the keyboard cover and the guide groove 19. In these drawings, plate-like attachments 20 are attached to the rear left and right ends of the keyboard cover 14 with set screws 21 respectively. Attachment 20
Is provided with a shaft 22 perpendicular to the upper surface of the keyboard cover 14, and the roller 18 is rotatably supported on the shaft 22. The roller 18 abuts the keyboard cover 14 on a side wall 19 a of a guide groove 19 provided in the arm 3. On the other hand, the keyboard cover 14
The lower edge is in contact with the lower wall 19b of the guide groove 19. The rollers 18 are not limited to a pair provided on the right and left rear portions of the keyboard cover 14. For example, as shown by a two-dot chain line in FIG. May be further provided with a pair of rollers.

As shown in FIG. 4, a low friction portion 23 is provided between the keyboard cover 14 and the lower wall 19b in order to enhance the slidability between the keyboard cover 14 and the lower wall 19b of the guide groove 19. Good. The low friction portion 23 can be formed, for example, by attaching felt to the lower surface of the keyboard cover 14 or the lower wall 19b. It can also be realized by sticking or coating a low friction material such as a fluororesin in a sheet form.

FIG. 5 is a rear view of an essential part showing an example in which a roller is used in place of the low friction part, and the same reference numerals as those in FIG. 4 denote the same or equivalent parts. In FIG. 5, the keyboard cover 14 has a rotating shaft (axis 22) of the roller 18 separately from the roller 18.
A lower surface copying roller 25 rotatably supported by a shaft 24 orthogonal to the shaft 24 is provided. The shaft 24 of the roller 25 is erected on an angled attachment 26,
The attachment 26 is fixed to the keyboard cover 14 together with the attachment 20 by a set screw 27. The roller 25 rolls on the lower wall 19b of the guide groove 19, and
4 is guided along the guide groove 19.

FIG. 6 is a rear view of an essential part showing an example in which the functions of the rollers 18 and 25 of FIG. 5 are realized by a single roller. In the figure, an attachment 29 is attached to the lower surface of the end of the keyboard cover 14 by a set screw 28. The attachment 29 has a horizontal portion and an extension extending obliquely downward from the horizontal portion. A shaft 30 is erected on the extension portion, and a roller 31 is rotatably mounted on the shaft 30.

The roller 31 rides on the lower wall 19b of the guide groove 19, but also contacts the side wall 19a when a force is applied to the keyboard cover 14 in the direction of the arm 3. That is, the roller 31 guides the keyboard cover 14 toward the intersection of the side wall 19a and the lower wall 19b.

The rollers 18, 2 shown in FIGS.
Each of the pairs 5 and 31 may be provided only in a pair at the rear left and right ends of the keyboard cover 14, or a pair may be additionally provided at a position near the front of the keyboard cover 14 as described with reference to FIG. Good.

The opening and closing operation of the keyboard cover 14 in the above configuration will be described. First, when opening the keyboard cover 14, a hand is applied to the handle 15 to apply a force upward. By this operation,
The resin cover 16 is guided upward along the guide plate 17. Subsequently, when the handle 15 is pressed substantially horizontally, the resin cover 1 is pressed.
6 is guided to the back of the main body 1 along the upper surface of the guide plate 17. Along with this, the rear portion of the keyboard cover 14 is also guided to the back of the main body 1 by the rollers 18, 25, 31 and the like provided at the left and right ends rolling in the guide grooves 19. Guide plate 17
The guide groove 19 has a surface inclined downward toward the rear end, so that the keyboard lid 14 can remain at a stable open position due to the inclination.

When closing the keyboard cover 14, pull the handle 15 with a hand to pull the resin cover 16 and the keyboard cover 14.
The rear ends of the guide plate 17 and the guide groove 19
Is guided in a direction opposite to the opening direction, and moves to a position where the keyboard cover 14 covers the keyboard 8. Finally, when the front end of the keyboard cover 14 is dropped along the front end of the guide plate 17, the keyboard 8 is completely covered by the keyboard cover 14.

During the opening and closing operations described above, the rollers 18, 25, 31 and the like provided on the side of the keyboard cover 14 move in the guide groove 19 in contact with the walls 19a, 19b. Therefore,
Even if skew occurs when the handle 15 is opened and closed with the handle 15 at a position deviated from the center in the width direction of the main body 1, the keyboard cover 14 moves smoothly via the rollers 18 and the like, and the skew immediately occurs. Will be resolved.

The guide groove 19 may be formed in the arm 3 itself, or may be formed by attaching a guide member to the arm 3. FIG. 7 is a cross-sectional view of a main part showing an example of a rear part of the keyboard cover instead of the guide groove 19. In the figure, a roller guide plate 32 is adhered to the arm 3, and the upper surface of the roller guide 32 is attached to the lower wall 19 b of the guide groove 19,
Side surfaces correspond to the side walls 19a of the guide groove 19, respectively. Therefore, in this case, the roller 18 abuts on the arm 3 and the roller 25 abuts on the roller guide plate 32, and the roller 31 is directed to the intersection of the arm 3 and the roller 25.

The rollers 18, 25, 31 are
The shape is not limited to the one having an outer peripheral shape of an arc-shaped cross section as shown in the figure, but may be an abacus ball shape, a column shape, a spherical shape, or the like. In short, any shape may be used as long as it is suitable for rolling on the guide groove 19 formed in the arm 3 or the guide means such as the arm 3 and the guide plate 32 attached to the arm 3.

[0029]

As is apparent from the above description, according to the first to fifth aspects of the present invention, both end surfaces of the keyboard lid are brought into contact with the first guide member or the brace via rolling elements, and The lower surfaces of both end portions are in contact with the second guide member or the lower wall of a groove provided in the arm via a low friction member or a rolling element. Therefore, it is possible to prevent the keyboard cover from being caught on the arm or the like when the keyboard cover is moved, and to ensure a smooth opening / closing operation.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an electronic piano according to an embodiment of the present invention.

FIG. 2 is a plan view of a keyboard cover according to an embodiment of the present invention.

FIG. 3 is a main part rear view of a side end portion of the keyboard cover showing an engagement portion between the keyboard cover and a brace.

FIG. 4 is a main part rear view showing a modified example of an engaging portion between a keyboard cover and a brace.

FIG. 5 is a main part rear view showing a modified example of an engaging portion between a keyboard cover and a brace.

FIG. 6 is a main part rear view showing a modified example of an engaging portion between a keyboard cover and a brace.

FIG. 7 is a main part rear view showing a modification of the guide member with which the rolling elements engage.

FIG. 8 is a sectional view of a main part showing an example of a conventional keyboard instrument.

FIG. 9 is an enlarged sectional view showing a rack and pinion mechanism used for a conventional keyboard instrument.

FIG. 10 is a sectional view of a main part showing another example of a conventional keyboard instrument.

[Explanation of symbols]

1: Electronic piano body, 2: Bottom plate, 3: Arm tree, 8 ...
Keyboard, 14: Keyboard cover, 15: Handle, 16: Resin cover, 17: Guide plate, 18, 25, 31 ... Roller,
19: guide groove, 20, 29: attachment, 2
1,27,28 ... Set screw

Claims (5)

[Claims] 1. A keyboard musical instrument having a keyboard cover that is opened and closed by moving in the front-rear direction of a musical instrument body, a first guide member for guiding both side surfaces of the keyboard cover, and a lower surface on both side surfaces of the keyboard cover. A keyboard musical instrument comprising: a second guide member; and a rolling element provided on the keyboard cover and rolling along the first guide member. 2. The keyboard musical instrument according to claim 1, further comprising a low friction member provided between said keyboard cover and said second guide member. 3. A keyboard musical instrument having a keyboard cover that is opened and closed by moving in the front-rear direction of a musical instrument body, wherein a first guide member for guiding both side surfaces of the keyboard cover, and a lower surface on both side surfaces of the keyboard cover are supported. A keyboard musical instrument comprising: a second guide member; and a rolling element provided on the keyboard cover and rolling toward an intersection of the first guide member and the second guide member. 4. A keyboard musical instrument having a keyboard cover which is opened and closed by moving in the front-rear direction of a musical instrument body, a first guide member for guiding both side surfaces of the keyboard cover, and a lower surface adjacent to both side surfaces of the keyboard cover. A second guide member that supports the keyboard cover, a first rolling element that is provided on the keyboard cover, and that rolls along the first guide member, a second rolling member that is provided on the keyboard cover, and is provided on the second guide member. A keyboard musical instrument comprising: a second rolling element that rolls along the same. 5. The vehicle according to claim 1, further comprising: arms provided on both sides of the keyboard cover, wherein the first guide member and the second guide member are a side wall and a lower wall of a guide groove formed in the arm, respectively. The keyboard instrument according to claim 1, 2, 3, or 4, wherein: