JPH09305165A - Keyboard lid opening and closing device for keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to smoothly open and close a keyboard lid and reduce the generation of noise while reducing the size and cost of the whole device. SOLUTION: The keyboard lid opening and closing device for the keyboard musical instrument having a rack 32c which is formed faceup extending in the front-rear direction of a keyboard 22 along the flank plate 14 of the housing 10 of the keyboard musical instrument, the keyboard lid 20, and pinion parts 42a which are arranged rotatably on both the right and left sides of the keyboard lid 20 and engage the rack 32c to roll the rack 32c has a columnar guide part which is arranged inside the pinion parts and roll together with the pinion parts in one body and a stopper member 34 which is arranged above the rack 32c and restricts the upward movement of the guide part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard lid opening / closing device for a keyboard instrument, and more particularly to a keyboard lid opening / closing device for a keyboard musical instrument that opens and closes by sliding the keyboard lid in the front-back direction of the keyboard.

[0002]

2. Description of the Related Art A keyboard lid opening / closing device for a keyboard instrument that opens and closes by sliding the keyboard lid in the front-rear direction is a keyboard instrument in which a shaft having pinions at both ends is provided at the rear of the keyboard lid. Racks that extend in the front-rear direction of the keyboard and engage with the pinions are formed on the inner surfaces of the left and right side plates of the housing of the case, and the operation of sliding the keyboard lid in the front-rear direction of the keyboard causes the pinions to move with the rack. There is known a configuration in which the keyboard lid is opened and closed by meshing and rolling above and actually sliding the keyboard lid in the front-back direction of the keyboard.

By the way, in the one having the above-mentioned meshing structure of the pinion and the rack, when the operation of gripping and sliding the front end of the keyboard lid on one side of the left and right side plates is carried out, the pinion is moved. The rattling of the rack and the rack increases the frictional resistance of the meshing part between the pinion and the rack, making it impossible to smoothly open and close the keyboard lid, and the noise of meshing between the pinion and the rack. Was pointed out.

Therefore, in order to solve the above-mentioned drawbacks, keyboard lid opening / closing devices for keyboard musical instruments having various configurations have been proposed.

For example, a keyboard lid opening / closing device for a keyboard instrument disclosed in Japanese Utility Model Laid-Open No. 3-8390 has a guide portion projectingly formed on a tip portion of a shaft provided with a pinion arranged at a rear portion of the keyboard lid. A pinion guide groove for slidably fitting the guide portion is provided on the inner surface of the side plate of the casing of the keyboard instrument, and the guide portion slides along the pinion guide groove to form a pinion and a rack. It prevents the rattling of the meshing of the keyboard, smoothly opens and closes the keyboard lid, and reduces the generation of noise.

[0006]

However, in the keyboard lid opening and closing device for a keyboard instrument disclosed in Japanese Utility Model Laid-Open No. 3-8390, the tip of a shaft provided with a pinion disposed at the rear portion of the keyboard lid. Since the guide portion is formed so as to project from the portion, an extra space is required in the direction of the rotation axis of the pinion, which causes the size of the entire apparatus to increase and the cost for that to increase.

The present invention has been made in view of the above-mentioned various problems of the prior art, and an object of the present invention is to reduce the size of the entire apparatus and reduce the cost while maintaining the keyboard. An object of the present invention is to provide a keyboard lid opening / closing device for a keyboard instrument that can smoothly open and close the lid and can reduce the occurrence of noise.

[0008]

In order to achieve the above object, a keyboard lid opening / closing device for a keyboard instrument according to the present invention is a device for opening and closing a keyboard of the keyboard instrument along a pair of left and right side plates of a casing of the keyboard instrument. A pair of left and right racks formed upward so as to extend in the front-rear direction, a keyboard lid that covers the upper side of the keyboard, and a pair of left and right racks that are rotatably disposed on both left and right sides of the keyboard lid. In a keyboard lid opening / closing device of a keyboard instrument having a pair of left and right pinions that mesh with each other and roll on the pair of left and right racks, a pair of left and right pairs arranged inside the pinion and rolling integrally with the pinion. It has a columnar guide member and a pair of left and right stopper members which are arranged above the rack and which restrict the upward movement of the guide member.

Therefore, according to the keyboard lid opening / closing device of the keyboard instrument of the present invention, the stopper member restricts the upward movement of the guide member, so that the rattling of the engagement between the pinion and the rack is suppressed, and the keyboard lid is closed. Can be opened and closed smoothly, and the generation of noise can be reduced.

Since the guide member is arranged inside the pinion rather than extending in the rotation axis direction of the pinion, it is not necessary to provide an extra space for the guide member in the rotation axis direction of the pinion. Therefore, it is possible to reduce the size of the entire device and reduce the cost.

In the above-described keyboard lid opening / closing device for a keyboard instrument according to the present invention, at least one of the stopper member and the guide member is elastically deformable, and at least one of the stopper member and the guide member is formed. By elastically deforming one,
When the guide member is pressed to provide frictional resistance and the guide member is allowed to roll, noise can be reliably prevented.

Further, by changing the protruding height of the stopper member toward the guide member and changing the frictional resistance, the operation resistance given to the operator for opening and closing the keyboard lid can be changed. .

Thus, when a strong operation resistance is given at the start and end of the opening / closing operation of the keyboard lid, the operator can sensuously recognize the start / end of the opening / closing operation of the keyboard lid. Therefore, it is possible to give the operator a feeling of high-quality operation.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a keyboard lid opening / closing device for a keyboard instrument according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an internal side view of a keyboard instrument equipped with an example of an embodiment of a keyboard lid opening and closing device for a keyboard instrument according to the present invention with one side plate and back plate removed. 3 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG.

The casing 10 of a keyboard instrument has a bottom plate 12, a pair of left and right side plates 14, a top plate 16, a front plate 18,
A keyboard lid 20, a back plate (not shown), and the like are configured, and inside thereof, a keyboard 22 composed of a plurality of white keys 22A and black keys 22B, and a keyboard supporting the keyboard 22. A frame 24 and a keyboard lid opening / closing device 26 for opening and closing the keyboard lid 20 by sliding the keyboard lid 20 in the front-back direction of the keyboard 22 are provided.

The keyboard lid 20 is formed in a flat plate shape and has an area enough to cover the keyboard 22.

The rear end of the keyboard 22 is supported on the keyboard frame 24 via a fulcrum member 28 so as to be swingable in the vertical direction. When the keyboard 22 is depressed, the front end thereof is pushed downward. An actuator (not shown) provided on the lower surface of the keyboard 22 operates the key switch 30, and an electronic circuit (not shown) is activated by this operation to generate a musical sound.

Note that the keyboard 22 is biased in the direction of arrow A in FIG. 1 around the fulcrum member 28 by a return spring (not shown), and in the state where no key is pressed, the lower surface of the front end portion. Stopper 22a and keyboard frame 2 formed on the
The cushioning member 24a formed in 4 is abuttingly engaged, and is locked in the state shown in FIG.

The keyboard opening / closing device 26 includes a pair of left and right side plates 1.
A pair of left and right lid rails 32 respectively arranged in
And a pair of left and right stopper members 34 arranged above the lid rails 32 of the pair of left and right side plates 14,
Angle 36 attached to the lower surface of the rear end of the keyboard lid 20
A shaft 40 rotatably supported by a shaft stay 38 fixed to the shaft stay 38, and pinion members 42 arranged at both ends of the shaft 40.

The pinion member 42 has a pinion part 42a located on the outer side and a guide part 42b located on the inner side, and the guide part 42b has a larger diameter than the pinion part 42a. Is formed in.

The front end of the lid rail 32 is formed as a front locking portion 32a which is formed upright, and the rear end of the lid rail 32 is formed as a rear locking portion 32b which is formed upright. A rack 32c that meshes with the pinion portion 42a of the pinion member 42 and a flat surface portion 32d that abuts the guide portion 42b are formed on the upper surface between the portion 32a and the rear locking portion 32b. The rack 32c is the keyboard 2
2 extends in the front-rear direction and has a length that extends over the opening / closing range of the keyboard lid 20.

The stopper member 34 arranged above the lid rail 32 is made of, for example, an elastic material such as an elastomer so as to be elastically deformable.
A front protrusion 34a and a rear protrusion 34b, which protrude downward, are formed at portions near the 2a and the rear locking portion 32b, respectively.

Here, the front protrusion 34a is the front protrusion 3
The front locking portion 32a side is steeply inclined and the rear locking portion 32b side is gently inclined around the top of 4a. In addition, the rear protrusion 34b is the rear protrusion 34b.
The slope on the front locking portion 32a side is gentle around the top of b, and the slope on the rear locking portion 32b side is formed steeply.

The guide portion 42a and the stopper member 34 are dimensioned and arranged so that there is a slight gap G in the region other than the front protruding portion 34a and the rear locking portion 32b.

With the above structure, the keyboard lid 2 shown in FIG.
In the closed state of 0, when the operator performs a lid opening operation of holding the front end portion of the keyboard lid 20 and sliding the keyboard lid 20 rearward, the pinion portion 42a moves forward on the rack 32c along with the lid opening operation. The pinion portion 42a is engaged with the rear locking portion 32b by rolling from the locking portion 32a side to the rear locking portion 32b.
By contacting with b, the open state of the keyboard lid 20 can be obtained.

At this time, when the opening operation of the keyboard lid 20 is started, a predetermined gap G exists between the guide portion 42b and the stopper member 34, and the operation resistance is extremely weak. Immediately after the start, the guide portion 42b shifts to a state in which it rolls while elastically deforming the steep inclination of the front protruding portion 34a, so that the guide portion 42b is strongly pressed against the flat surface portion 32d of the lid rail 32 and a strong operation resistance is obtained. Occurs,
The operator can sensuously recognize the start of the lid opening operation. Then, the guide portion 42b has the front protrusion 34a.
After a gentle slope, the state shifts to a state in which a predetermined gap G exists between the guide portion 42b and the stopper member 34, so that the lid opening operation proceeds while gradually weakening the strong operation resistance.

When the end of the lid opening operation is approaching, the guide portion 42
Since b shifts to a state in which it rolls while elastically deforming the gentle slope of the rear protruding portion 34b, the guide portion 42b
Is gradually pressed against the flat surface portion 32d of the lid rail 32 to gradually increase the operation resistance, and the operator can sensually recognize that the lid opening operation is almost completed. Then, when the guide portion 42b shifts to the steep inclination of the rearward protruding portion 34b, the strong operation resistance is abruptly weakened, and the operator can sensuously recognize the end of the lid opening operation, and further the guide portion 42b. A predetermined gap G exists between the stopper member 34 and the stopper member 34, and then the pinion portion 42a comes into contact with the rear locking portion 32b after the operation resistance is extremely weak, whereby the keyboard lid 20 can be opened. .

In this open state, the guide portion 42b is restricted from moving forward by the rearward projecting portion 34b, so that the keyboard lid 20 does not close even if the housing 10 is tilted forward. There is no possibility of accidentally packing the keyboard lid 20 with a finger or the like.

On the other hand, when the operator holds the front end portion of the keyboard lid 20 and performs the lid closing operation of sliding the keyboard lid 20 forward in the opened state of the keyboard lid 20, the above-described opening operation is reversed. The operation will be performed.

That is, the pinion portion 42a moves on the rack 32c from the rear locking portion 32b side to the front locking portion 3 in accordance with the closing operation.
When the pinion portion 42a abuts on the front locking portion 32a, the keyboard lid 20 is closed.

At this time, when the operation of closing the keyboard lid 20 is started, a predetermined gap G exists between the guide portion 42b and the stopper member 34, and the operation resistance is extremely weak. Immediately after the start, the guide portion 42b is transferred to a state in which it rolls while elastically deforming the steep inclination of the rearward projecting portion 34b, so that the guide portion 42b is strongly pressed against the flat surface portion 32d of the lid rail 32 and a strong operation resistance is obtained. Occurs,
The operator can sensuously recognize the start of the lid closing operation. Then, the guide portion 42b has a rear protrusion 34b.
After a gentle slope, the state shifts to a state where a predetermined gap G exists between the guide portion 42b and the stopper member 34, so that the lid closing operation proceeds while gradually weakening the strong operation resistance.

When the closing operation is approaching, the guide portion 42
Since b shifts to a state in which it rolls while elastically deforming the gentle slope of the front protrusion 34a, the guide portion 42b
Is gradually pressed against the flat surface portion 32d of the lid rail 32 to gradually increase the operation resistance, which allows the operator to sensually recognize that the closing operation of the lid is almost completed, preventing finger jamming. can do. Then, the guide portion 42
When b shifts to the steep inclination of the front protruding portion 34a, the strong operation resistance is abruptly weakened, and the operator can sensually recognize the end of the lid closing operation, and further the guide portion 42b.
There is a predetermined gap G between the stopper member 34 and the stopper member 34, and after the operation resistance is extremely weak, the pinion portion 4
2a abuts on the front locking portion 32a so that the keyboard lid 2
A closed state of 0 is obtained.

In this closed state, the guide portion 42b is restricted from moving rearward by the front protruding portion 34a, so that the keyboard lid 20 does not open even if the housing 10 is tilted backward. It's safe.

Therefore, the operator can visually recognize the start and end of the opening / closing operation of the keyboard lid 20,
It is possible to give the operator a feeling of high-quality operation.

Further, during the opening / closing operation of the keyboard lid 20 described above, the stopper member 34 restricts the upward movement of the guide portion 42b, so that the rattling of the engagement between the pinion portion 42a and the rack 32c is suppressed. It is possible to smoothly perform the opening / closing operation of the keyboard lid 20 and reduce the occurrence of noise.

Particularly, the guide portion 42b is the lid rail 32.
In the state in which the pinion portion 42a and the rack 32c are not in contact with each other in the state of being pressed against the flat surface portion 32d of FIG. 4, noise is reliably prevented from occurring in FIG. Other configurations of are shown. Note that the same configuration as that shown in FIG.
The detailed description thereof will be omitted by giving the same reference numerals to those.

In the structure shown in FIG. 4, the pinion portion 142a of the pinion member 142 is formed by a bevel gear, and the guide portion 142b is continuously provided on the outer diameter side inside the pinion portion 142a. The rack 132c of the lid rail 132 is formed so as to be able to mesh with the pinion portion 142a formed of the bevel gear. In the configuration shown in FIG.
By restricting the upward movement of the guide portion 142b by means of 4, the rattling of the meshing between the pinion portion 142a and the rack 132c is suppressed, the opening / closing operation of the keyboard lid 20 can be performed smoothly, and noise is generated. Can be reduced.

Further, according to this structure, since the pinion portions 142a of the left and right pinion members 142 are formed by the bevel gears, the shaft of the keyboard lid 20 is weighted by the weight of the keyboard lid 20 at the meshing position between the left and right pinion portions 142a and the rack 132c. An action force is generated inward in the axial direction of 40, so that the keyboard lid 20 is always left and right racks 132.
The keyboard lid 20 can be opened and closed while being maintained at the center between c. This function is called the automatic axis adjustment function, and this function makes the keyboard lid 20 more stable.
Can be opened and closed.

Further, when the guide portion 142b rolls while elastically deforming the front protruding portion 34a and the rear protruding portion 34b of the stopper member 34, the pinion portion 142a.
The rack 132c and the rack 132c are brought into pressure contact with each other, thereby providing an operation resistance.

In the above embodiment, the stopper member 34 is elastically deformable, but instead of this, the guide portions 42b and 142b may be elastically deformable, or the stopper member 34 may be formed. And guide part 42
Both b and 142b may be elastically deformable.

In the above embodiment, the stopper member 34 is formed with two protrusions, that is, the front protrusion 34a and the rear protrusion 34b. However, the present invention is not limited to this, and any operation resistance can be provided. For application, the protruding portion of the stopper member 34 may have any shape.

Further, in the above embodiment,
Although the side surface plate 14, the lid rails 32 and 132, and the stopper member 34 are separately configured, they may be integrally configured by an appropriate combination. That is, the side plate 14, the lid rails 32 and 132, and the stopper member 34 may be integrally formed, the side plate 14 and the lid rails 32 and 132 may be integrally formed, or the side plate 14 and the stopper member may be integrally formed. 34 may be integrally formed, or the lid rails 32 and 132 and the stopper member 34 may be integrally formed.

[0044]

Since the present invention is configured as described above, the keyboard lid can be smoothly opened and closed while the overall size of the device is reduced and the cost is reduced. It has an excellent effect that the generation of noise can be reduced.

[Brief description of drawings]

FIG. 1 is an internal side view of a keyboard instrument equipped with an example of an embodiment of a keyboard lid opening and closing device for a keyboard instrument according to the present invention with one side plate and back plate removed.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view corresponding to FIG. 3, showing another configuration of the lid rail and the pinion member.

[Explanation of symbols]

 10 Housing 12 Bottom Plate 14 Side Plate 16 Top Plate 18 Front Plate 20 Keyboard Lid 22 Keyboard 32, 132 Lid Rail 32a Front Locking Part 32b Rear Locking Part 32c, 132c Rack 32d Flat Part 42, 142 Pinion Member 42a, 142a Pinion parts 42b, 142b Guide part 34 Stopper member 34a Front protruding part 34b Rear protruding part

Claims (3)

[Claims] 1. A pair of left and right racks formed upward along the pair of left and right side plates of the casing of the keyboard instrument so as to extend in the front-rear direction of the keyboard of the keyboard instrument, and above the keyboard. A keyboard lid for covering, and rotatably arranged on both left and right sides of the keyboard lid,
In a keyboard lid opening / closing device for a keyboard instrument, which has a pair of left and right racks and a pair of left and right pinions that roll on the pair of left and right racks, respectively, wherein the device is arranged inside the pinion and is integrally formed with the pinion. A keyboard lid for a keyboard instrument, comprising a pair of left and right cylindrical guide members that roll, and a pair of left and right stopper members that are arranged above the rack and that regulate the upward movement of the guide members. Switchgear. 2. The keyboard lid opening / closing device for a keyboard instrument according to claim 1, wherein at least one of the stopper member and the guide member is elastically deformable, and at least the stopper member and the guide member. A keyboard lid opening / closing device for a keyboard instrument, characterized in that one of them elastically deforms to press-contact the guide member to provide frictional resistance and to allow the guide member to roll. 3. The keyboard lid opening / closing device for a keyboard instrument according to claim 2, wherein the protrusion height of the stopper member in the guide member direction is changed to change the frictional resistance. Keyboard lid opening / closing device.