JP2001175247A - Fallboard opening/closing device for keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fallboard opening/closing device for a keyboard instrument which allows the curtailment of a manufacturing cost and the easy access to the inside in assembly and maintenance of a fallboard and can enhance the degree of freedom in layout at the inner flanks of arms. SOLUTION: The fallboard opening/closing device of the keyboard instrument for opening and closing the fallboard 6 between an open position where the fallboard is housed to the lower side of a topboard 3 and a close position where the fallboard projects to the front side of the topboard 3 has right and left movable members 5 and 5 which are freely turnably connected to the rear end of the fallboard 6 and support the fallboard 6 in a hanging state, right and left guide rails 4 and 4 which are disposed to extend in a longitudinal direction at the under surface of the topboard 3, are freely longitudinally movably engaged with the right and left movable members 5 and 5 and guide the fallboard 6 between the open position and the close position via the right and left movable members 5 and 5 and front and rear stoppers 11 and 13 which respectively detain the front part of the fallboard 6 in the close position and the open position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard for a keyboard instrument such as an electronic piano for opening and closing a keyboard cover between an open position accommodated under a roof and a closed position protruding forward of the roof. The present invention relates to a lid opening and closing device.

[0002]

2. Description of the Related Art As a conventional electronic piano, for example, the one shown in FIG. 7 is known. The piano body 52 of the electronic piano 51 includes left and right arms 5 made of Lauan plywood or the like.
3, 53 (only one is shown), a case 56 formed by assembling a shelf board 54, a roof 55, and the like. Shelf 54 and roof 55 are respectively
3 is horizontally fixed and supported between the lower part and the upper end part of the case 3, and the roof 55 covers the rear half of the upper surface of the case 56. In the case 56, a number of keys 57, an action 59 including a hammer 58 provided for each key 57,
The control panel 60 and the like are housed. The control panel 60 is arranged above a central portion of the keyboard 57.

A front guide groove 61 and a rear guide groove 6 are provided in the front half and the rear half of the inner surface of each of the arms 53, 53.
2 are formed respectively. As shown in the figure, while the rear guide groove 62 linearly extends in the front-rear direction,
The front guide groove 61 is formed so as to substantially follow the outer shape of the crosspiece 53 from the front vertical portion 61 a, the front lower inclined portion 61 b at the center, and the rear horizontal portion 61 c. on the other hand,
A front guide shaft 64 and a rear guide shaft 65 are provided at the front and rear ends of the keyboard cover 63 so as to protrude to the left and right sides, respectively, and engage with the front guide groove 61 and the rear guide groove 62, respectively. I have.

With such a configuration, the keyboard cover 63 is housed under the roof 55 by the front and rear guide shafts 64 and 65 being guided along the front and rear guide grooves 61 and 62, respectively.
Release position for releasing the keyboard 57 and the like (position shown in FIG. 7)
Is pulled forward from the roof 55, and is slid in the front-rear direction between a closed position (not shown) in which the keyboard 57 and the like are covered and closed. In the closed position, the keyboard lid 63 is in contact with a mouthpiece 66 fixed to the front end of the shelf 54. A rack 67 is formed on the bottom surface of the rear guide groove 62, and a pinion 68 that meshes with the rack 67 is formed on the rear guide shaft 65. When the keyboard cover 63 moves, the pinion 68 moves on the rack 67. By rolling, the keyboard cover 63 can be smoothly opened and closed while preventing left and right displacement of the keyboard cover 63.

[0005]

However, in the above-mentioned conventional opening / closing device for a keyboard lid, in order to guide the keyboard lid 63, the front and rear two guide grooves 61 and 62 must be formed in the arm 53. In particular, since the shape of the front guide groove 61 is complicated, there is a problem that it takes time and effort to process and manufacture these and the manufacturing cost increases. Further, since the front and rear guide grooves 61 and 62 are disposed on the inner side surface of the crosspiece 53 so as to occupy a large space almost entirely in the front-rear direction, it is difficult to lay out other parts, and mounting of parts and processing of harnesses are difficult. It is difficult to do. Further, since the keyboard cover 63 is attached across the inner surfaces of the arms 53, 53, unless the arm 53 is assembled.
The keyboard cover 63 cannot be mounted, and the guide groove 61,
It is not easy to assemble the guide shafts 64 and 65 with the guide shaft 62. For the same reason, in order to access the action 59 housed in the back of the piano body 52 at the time of maintenance, for example, after removing the roof 55,
3 has to be removed and there is a drawback that maintenance is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can reduce the manufacturing cost, facilitate the access to the inside during assembly and maintenance of the keyboard cover, and improve the inside of the arms. An object of the present invention is to provide a keyboard cover opening / closing device for a keyboard instrument that can increase the degree of freedom in layout on the side surface.

[0007]

SUMMARY OF THE INVENTION To achieve this object, the present invention is directed to opening and closing a cover between an open position housed under the roof and a closed position protruding forward of the roof. A keyboard cover opening and closing device for a keyboard instrument, wherein the keyboard cover is rotatably connected to a rear end portion of the keyboard cover, and left and right movable members that support the keyboard cover in a suspended state, and extend in a front-rear direction on a lower surface of a roof. The left and right movable members are movably engaged with each other in the front-rear direction, and the left and right guide rails guide the keyboard cover between the open position and the closed position via the left and right movable members. And front and rear stoppers for locking the front portion at the closed position and the open position, respectively.

According to the keyboard cover opening and closing device for a keyboard instrument,
The rear end of the keyboard cover is rotatably connected to the left and right movable members, and is supported by the movable members in a suspended state. For example, when the keyboard cover is pulled forward from the open position, the left and right movable members are guided forward along left and right guide rails provided on the lower surface of the roof, so that the keyboard cover moves forward. It projects to the front side of the roof and is held in the closed position by the front part being locked by a front stop. When the keyboard cover is pushed forward from this closed position, the movable member is guided rearward in the same manner as described above, so that the keyboard cover moves rearward and is housed under the roof, and the front portion is rearward. It is held in the open position by being locked by the stopper.

As described above, in the keyboard cover opening / closing device of the present invention, the keyboard cover is opened and closed while the movable member that rotatably supports the rear end of the keyboard cover in a suspended state is guided by the guide rail. Unlike the related art, there is no need for a guide means such as a front guide groove having a complicated shape for guiding the front part of the keyboard cover, and the manufacturing cost can be reduced accordingly. Further, since the guide rail is provided on the roof, there is no need to provide a guide means for guiding the keyboard cover on the inner surface of the arm tree, so that the inner surface of the arm tree is free. As a result, the degree of freedom on the inner surface of the arm tree is increased, so that it is possible to easily attach other parts, process a harness, and the like. Further, since the lid is attached to the roof via the movable member and the guide rail, the lid can be attached and detached integrally with the roof, thereby assembling and maintaining the lid. In this case, access to the inside can be easily performed.

In this case, sliding surfaces are formed on the bottom surfaces of the left and right guide rails, and the left and right movable members are constituted by left and right sliders which can slide on the sliding surfaces of the guide rails in the front-rear direction. preferable.

[0011] In this configuration, the movable member is formed of a slider, and the slider slides on the sliding surface of the guide rail, whereby the keyboard cover is guided and moved in the front-rear direction. By configuring the movable member with a simple slider as described above, a keyboard cover opening / closing device can be realized with a very simple configuration and at low cost.

Further, in this case, a long groove extending continuously in the longitudinal direction is formed on the sliding surface of the guide rail, and the long groove of the sliding surface is formed on the lower surface of the slider so as to be movable in the longitudinal direction and non-rotatable. It is preferable that a projection that engages in a state is formed.

In this configuration, the protrusion on the lower surface of the slider is engaged with the long groove of the sliding surface of the guide rail in a non-rotatable state, so that the slider is slid when sliding (when viewed in plan). Tilt) can be suppressed, so that the keyboard lid can be smoothly opened and closed.

Alternatively, in the keyboard cover opening and closing device according to the first aspect, a rack is formed on the bottom surface of the left and right guide rails,
It is preferable that the left and right movable members are respectively constituted by left and right pinions that can roll in the front-rear direction while meshing with the guide rail rack.

According to this configuration, the movable member is formed of a pinion, and the pinion rolls while meshing with the rack on the bottom surface of the guide rail, whereby the keyboard cover is guided and moved in the front-rear direction. As described above, by configuring the mechanism for moving the keyboard lid with a relatively simple pinion and rack, the keyboard lid opening / closing device can be realized with a simple configuration and at low cost.

In this case, it is preferable that a connecting rod for connecting the left and right pinions to each other is further provided, and a rear end portion of the keyboard cover is rotatably attached to the connecting rod.

In this configuration, the left and right pinions can be rotated by the connecting rods in synchronization with each other, so that the keyboard cover can be smoothly opened and closed.

In these cases, on the inner surface of the guide rail,
It is preferable that a long groove extending continuously in the length direction is formed, and a projection engaging with the long groove is formed on an outer surface of the pinion.

In this configuration, since the projection of the pinion is engaged with the long groove of the guide rail, the lifting of the pinion from the rack can be prevented, so that the opening / closing of the keyboard lid can be performed more smoothly.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3
1 shows a keyboard cover opening / closing device for an electronic piano according to a first embodiment of the present invention. Since the electronic piano 1 differs from the conventional electronic piano 51 already described only in the keyboard cover opening / closing device, the illustration and description of the same components will be omitted as appropriate below, and the keyboard cover opening / closing device will be omitted. The explanation will be focused on the following.

As shown in FIGS. 1 and 2, the keyboard cover opening / closing device 2 of the electronic piano 1 includes left and right guide rails 4, 4 provided on the lower surface of a roof 3, and slides on the respective guide rails 4. It comprises left and right sliders 5 and 5 which engage and support the keyboard cover 6 in a suspended state.

The left and right guide rails 4, 4 are formed symmetrically from each other from a pressed product of an iron plate or a molded product of a synthetic resin, have a length slightly shorter than the depth of the roof 3, and are provided in the front-rear direction. It is provided so that it may extend. As shown in FIG. 3, each guide rail 4 has a horizontal mounting portion 4a,
A vertical guide portion 4b extending downward from its inner end and a horizontal guide portion 4c extending inward from its lower end are formed to have a crank-shaped uniform cross section.
At the part a, it is fixed to the lower surface of the roof 3 by a plurality of screws 7 (only one is shown). The slider housing 4d is defined by the lower surface of the roof 3 and the vertical guide 4b and the horizontal guide 4c of the guide rail 4, and the bottom surface of the horizontal guide 4c is a sliding surface 4e. The front and rear ends of the slider housing 4d are open. A long groove 4f is formed at the center of the sliding surface 4e so as to extend continuously in the front-rear direction.

Each of the sliders 5 is a rectangular parallelepiped block of a predetermined size formed of a synthetic resin or the like.
It is housed in a state of being engaged with the slider housing 4d of the guide rail 4 from inside, and is slidable in the front-rear direction on the sliding surface 4e. A protrusion 5a having a rectangular cross section is formed on the lower surface of the slider 5, and the protrusion 5a engages with the long groove 4f of the sliding surface 4e of the guide rail 4 so as to be movable in the front-rear direction and non-rotatably. are doing. On the other hand, the keyboard cover 6
Left and right L-shaped support brackets 8 and 8 are screwed at predetermined positions at the rear end of the upper surface of the keyboard, and the keyboard cover 6 has a portion protruding outward from each support bracket 8 and a corresponding slider 5. By being rotatably connected to the inner side surface of the slider 5, it is supported by the slider 5 in a suspended state.

As shown in FIG. 2, a front frame plate 9 is attached to the front end of the keyboard cover 6, and a stopper shaft 10 is provided so as to project from the front frame plate 9 to the left and right sides. I have. Then, the stopper shaft 10 abuts on and engages with a mouthpiece 11 (front stopper) fixed to the front end of a shelf (not shown), whereby the keyboard cover 6 is held at the closed position. It has become. Also, the left and right arms 12, 1
2 (only one is shown), a stopper pin 13 (rear stopper) for holding the keyboard cover 6 in an open position is provided at a predetermined position below the front end of the roof 3 so as to protrude. .

Next, the opening / closing operation of the keyboard cover 6 by the keyboard cover opening / closing control device 1 having the above configuration will be described with reference to FIG.
The broken line in the figure shows a state where the keyboard cover 6 is in the open position. That is, in this open position, the slider 5 is located at the rear end of the guide rail 4 and the front of the keyboard cover 6 is in contact with the stopper pin 13 and is locked, so that the keyboard cover 6 3 is accommodated in a substantially horizontal posture, and a keyboard (not shown) and the like are open.

When the keyboard cover 6 is pulled toward the user from this open position, the left and right sliders 5 are guided by the left and right guide rails 4 and slide forward on the sliding surfaces 4e. While being kept in contact with the stopper pin 13, it moves forward and is pulled out from the roof 3 forward. When the front portion of the keyboard cover 6 is pushed down at the end of this movement, the keyboard cover 6 rotates around the support fitting 8, and the stopper shaft 10 comes into contact with the mouthpiece 11 and is locked. The keyboard cover 6 is held in the closed position, and covers the keyboard and the like in a forward lowered position.

On the other hand, when the keyboard cover 6 is pushed forward from the closed position while being lifted, the slider 5 slides backward in the same manner as described above, and the keyboard cover 6 moves rearward and returns to the open position. I do.

As described above, according to the keyboard cover opening / closing device 2 of the present embodiment, the slider 5 for supporting the rear end portion of the keyboard cover 6 so as to be rotatable in a suspended state is guided by the guide rails 4. Since the cover 6 is opened and closed, unlike the related art,
There is no need for a guide means such as a front guide groove having a complicated shape for guiding the front part, and the manufacturing cost can be reduced accordingly. Further, since the guide rail 4 is provided on the roof 3, the inner surface of the arm 12 is provided with the stopper pin 1.
It is completely free except for the case where 3 is provided. As a result, the degree of freedom of the layout on the inner side surface of the crosspiece 12 is increased, so that attachment of other parts, processing of a harness, and the like can be easily performed.

Further, since the keyboard lid 6 is attached to the roof 3 via the slider 5 and the guide rail 4, it is possible to attach and detach the keyboard lid 6 integrally with the roof 3. For example, the keyboard cover 6 and the roof 3 can be pre-assembled before being incorporated into the arm block 12, or the keyboard cover 6 can be removed together with the roof 3 during maintenance, so that the keyboard cover 6 can be removed.
It is possible to easily access the inside during assembly and maintenance.

The keyboard cover opening / closing device 2 of the present embodiment comprises:
Since the simple slider 5 is employed as the movable member, it can be realized with a very simple configuration and at low cost. Furthermore, since the protrusion 5a of the slider 5 is engaged with the long groove 4f of the slide surface 4e of the guide rail 4 in a non-rotatable state, the movement of the slider 5 during sliding can be suppressed. Can be smoothly opened and closed.

FIGS. 4 to 6 show a keyboard cover opening / closing device according to a second embodiment of the present invention. This keyboard lid opening and closing device 2
The second embodiment is characterized in that a rolling mechanism using a pinion and a rack is used as a moving mechanism of the keyboard cover 6 instead of the sliding mechanism using the sliding surface 4e of the guide rail 4 and the slider 5 in the first embodiment. It is different from the form.

Specifically, the left and right guide rails 23, 2
3 (only one is shown), a rack 24 is formed so as to extend in the front-rear direction, and left and right pinions 25, 25 (only one is shown) are engaged with each rack 24. The pinions 25 are connected and fixed to each other by a connecting rod 26. Then, left and right support brackets 27 screwed to the connecting rod 26 at the rear end of the upper surface of the keyboard cover 6,
27 (only one is shown) is rotatably connected so that the keyboard cover 6 is supported in a suspended state. As shown in FIG. 6, a long groove 2 continuously extending in the front-rear direction is formed on the inner side surface of the vertical guide portion 23a of the guide rail 23.
On the other hand, a projection 25a is formed on the outer surface of the pinion 25 so as to engage with the long groove 23b. Other configurations are the same as in the first embodiment.

According to the above configuration, the pinion 25 rolls in the front-rear direction while engaging with the rack 24 of the guide rail 23 as the keyboard cover 6 is pushed and pulled, thereby achieving the same as in the first embodiment. The keyboard cover 6 can be opened and closed between an open position (a broken line position in FIG. 2) and a closed position (the same solid line position) while the rear end is suspended rotatably. The above-described effect according to the embodiment can be obtained similarly. In the present embodiment, in particular, the left and right pinions 25, 25 are connected by the connecting rod 26, so that they rotate in synchronization with each other, and their projections 25a are connected to the long grooves 2 of the guide rail 23.
By engaging with 3b, lifting from the rack 24 is prevented, so that opening and closing of the keyboard cover 6 can be performed very smoothly. In addition, since the keyboard cover opening / closing device 22 of the present embodiment employs a relatively simple pinion and rack as a moving mechanism of the keyboard cover 6, it can be realized with a simple configuration and at low cost, as in the first embodiment. can do.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, the embodiment is an example in which the present invention is applied to an electronic piano. However, the present invention is not limited to this, and the present invention relates to a keyboard of a type that is opened and closed between an open position on a lower side of a roof and a closed position on a front side. Of course, the present invention can be applied to other keyboard instruments having a lid, such as an electronic organ. In addition, the configuration of the details can be appropriately changed within the scope of the present invention.

[0035]

As described above, the cover opening / closing device for a keyboard instrument according to the present invention can reduce the manufacturing cost, facilitate the access to the inside during the assembly and maintenance of the cover, and provide the inside of the arm bar. This has the effect of increasing the degree of freedom in layout on the side.

[Brief description of the drawings]

FIG. 1 is a front view showing a keyboard cover opening and closing device of an electronic piano according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is a partially enlarged front view of FIG. 1;

FIG. 4 is a partial front view showing a keyboard cover opening and closing device for an electronic piano according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a partially enlarged front view of FIG. 4;

FIG. 7 is a side sectional view showing a conventional keyboard cover opening / closing device for an electronic piano.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic piano (keyboard instrument) 2 Keyboard lid opening / closing device 3 Roof 4 Guide rail 4e Sliding surface 4f Long groove 5 Slider (movable member) 5a Projection 6 Keyboard lid 11 Mouth stick (front stopper) 13 Stopper pin (rear stopper) 22 Keyboard Lid opening / closing device 23 Guide rail 23b Long groove 24 Rack 25 Pinion (movable member) 25a Projection 26 Connecting rod

Claims (6)

[Claims] 1. A keyboard cover opening and closing device for a keyboard instrument for opening and closing a keyboard cover between an open position accommodated under a roof and a closed position protruding forward of the roof, wherein the keyboard cover is provided. A left and right movable member rotatably connected to a rear end of the keyboard and supporting the keyboard cover in a suspended state; and a left and right movable member provided on a lower surface of the roof so as to extend in a front-rear direction. A left and right guide rail that movably engages in the front-rear direction and guides the keyboard cover between the open position and the closed position via the left and right movable members, and a front portion of the keyboard cover. A lid opening and closing device for a keyboard instrument, comprising: front and rear stoppers respectively locked at a closed position and an open position. 2. A sliding surface is formed on a bottom surface of the left and right guide rails, and the left and right movable members are constituted by left and right sliders slidable on the sliding surface of the guide rail in a front-rear direction. The keyboard cover opening / closing device for a keyboard instrument according to claim 1, wherein: 3. The sliding surface of the guide rail is formed with a long groove continuously extending in the longitudinal direction thereof, and on the lower surface of the slider, the long groove of the sliding surface is movable in the front-rear direction. 3. The keyboard cover opening / closing device for a keyboard instrument according to claim 2, wherein a projection that engages in a non-rotatable state is formed. 4. A rack is formed on the bottom surface of the left and right guide rails, and the left and right movable members are respectively formed by left and right pinions that can roll in the front-rear direction while meshing with the rack of the guide rail. The keyboard cover opening / closing device for a keyboard instrument according to claim 1, wherein: 5. The system according to claim 4, further comprising a connecting rod connecting the left and right pinions to each other, wherein the rear end of the keyboard cover is rotatably attached to the connecting rod. A keyboard cover opening / closing device for the keyboard instrument described in the above. 6. A long groove extending continuously in a length direction of the guide rail is formed on an inner side surface of the guide rail, and a projection engaging with the long groove is formed on an outer side surface of the pinion. The keyboard cover opening / closing device for a keyboard instrument according to claim 4 or 5, wherein