JPH0792964A - Lid body opening and closing device of keyboard musical instrument - Google Patents

Abstract

PURPOSE:To reduce a feeling of oppression in a musical performance and improve sound effects. CONSTITUTION:A rotatable screw 13 which is united with a pinion 14 is threadably engaged with a nonrotational screw 6 implanted in a musical instrument body 10 and mounted on an elevation plate 12, which can move up and down in parallel, rotatably and movably in the axial direction, and a lid body 20 is made movable in the front-rear direction of the elevation plate 12 and integrally movable in the upward-downward direction by a fixed guide 21b provided to the elevation plate 12 and a movable slider 21a provided to the lid body 20; and a rack 22 which engages the pinion 14 is provided on the reverse surface of the lid body 20 and the lid body 20 is pressed in the front-rear direction to rotate the rotatable screw 13 through the pinion 14, thereby enabling the lid body 20 to moves up and down by its lead quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid opening / closing device for a keyboard musical instrument, which covers a keyboard portion of a musical instrument body and various operating elements arranged in the vicinity thereof.

[0002]

2. Description of the Related Art Conventionally, as a lid opening / closing device for covering the upper surface of a musical instrument body of a keyboard musical instrument such as an electronic organ, a rear end portion of the lid body is rotatably hinged to the musical instrument body and is opened when the lid is opened. A rotating type that is erected on the body of the musical instrument has been widely used. Also, the lid can be slid in the front-back direction so that it can be stored inside the instrument body when the lid is opened, or the lid can be formed into a rounded door that is rolled into the instrument body when the lid is opened. It is well known.

Further, as an example of an improved type of the above-mentioned rotary lid, for example, as shown in Japanese Utility Model Laid-Open No. 3-8392, the rear end of the lid is connected to a musical instrument main body through a link mechanism and a damper mechanism. When the lid is opened, the rear part of the lid is erected on the main body so that the rear part of the lid is immersed in the main body. There is also one that is designed to prevent the player from pinching strongly and to relieve the player's feeling of pressure when opening the lid.

Further, as another example of an improved type of the rotary type lid, as shown in, for example, Japanese Utility Model Laid-Open No. 61-128695, the rear end portion is pivotally attached to the musical instrument body. The lid is composed of first and second lids that are hinged to be freely foldable, and the height of the lid that is erected on the main body when the lid is opened is lowered to reduce the feeling of pressure when playing. It is also known to do so.

[0005]

However, in such a conventional lid opening / closing device for a keyboard musical instrument, the lid body is slidably housed in the instrument body, and in particular, a portable keyboard electronic device. In the case of a miniaturized instrument body such as a musical instrument, there is a possibility that a storage space for various electrical components such as a circuit board cannot be secured.

Further, in the one disclosed in Japanese Utility Model Laid-Open No. 3-8392, the structure is complicated and the design flexibility is restricted, and the link mechanism and the damper mechanism have to be provided in the main body of the musical instrument. There was a possibility that the space would be insufficient like the sliding lid. Furthermore, the actual development 61-
Although the structure disclosed in Japanese Patent No. 128695 is simplified, since the lids are hinged to each other, the hinges are damaged if they are inadvertently pressed by hand or a heavy object is dropped. There was a fear.

[0007] None of them can obtain the effect of improving the acoustic characteristics by adjusting the opening degree of the lid. The present invention has been made in view of the above points, and an object of the present invention is to reduce the feeling of pressure during performance and to improve the acoustic effect.

[0008]

In order to achieve the above object, the present invention provides a lid opening / closing device for a keyboard instrument, which is provided with a lid for covering the upper surface of the instrument body, and is rotated with the axis line perpendicular to the instrument body. A screw pair consisting of a non-rotating screw that is disabled and a rotatable screw that is screwed into the non-rotating screw, and a pinion that is fixed to the rotatable screw with its axis aligned.
A rack fixed to the lid body in parallel with the longitudinal direction of the keys of the keyboard part and capable of engaging with the pinion, and a rack interposed between the rotatable screw and the lid body and in the vertical direction between the two. (EN) A lid opening / closing device for a keyboard instrument, which has a lid support means that allows relative movement in the front-rear direction while keeping a constant distance.

[0009]

With the lid opening / closing device for a keyboard instrument according to the present invention configured as described above, the rack on the lid rotates the pinion by simply pressing the front end of the lid in the closed state rearward, A rotatable screw integrated with this pinion can be rotated. As a result, the rotatable screw that is screwed into the non-rotating screw on the instrument body rises by the amount of the lead,
The lid moves to the rear and at the same time moves to the upper to open the lid.

At this time, if the backward pressing of the lid is stopped at an arbitrary position, the movement of the lid can be stopped, and the acoustic characteristics can be changed according to the degree of opening and closing.
On the contrary, when the lid is pulled forward from the open state, the rotatable screw rotates in the reverse direction to close the lid.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a view of FIG. 2A in which only the lid body of the first embodiment is removed when the present invention is applied to a keyboard electronic musical instrument.
2 is a horizontal sectional view taken along line BB in FIG. 1, FIG. 3 is a side sectional view taken along line CC in FIG. 1, and FIG. In FIG. 1, only the lid opening / closing device including the lid not shown in FIG. 1 is shown.

The instrument body 10 includes a front plate 10a and left and right side plates 1.
0b, 10c, a rear plate 10d, and a bottom plate 10e form a hexagonal box shape with both corners of the rear part cut out, and the upper part is
A top plate 10f, which is partly applied to the panel surface, is provided, and a keyboard portion 1 having an open top is provided at the front portion thereof.

A key 2 comprising a large number of white keys 2A and black keys 2B is arranged in the keyboard portion 1, and a tone switch, a waltz, a lock, etc. for producing a tone color of an organ, a piano, etc. are provided on a top plate 1f behind it. Various operating elements 3 such as a rhythm switch are provided, and speakers 4A, 4 separated into left and right are provided in the center of the musical instrument body 10.
By providing B, the corresponding key switch (not shown) is closed by pressing the key to activate the tone forming circuit,
Musical sounds are generated from the speakers 4A and 4B.

Then, as shown in FIG. 5, a guide shaft 5 having a column portion 5a, a key portion 5b, and a flange portion 5c is erected at approximately the center of the bottom plate 10e of the musical instrument body 10 having such a structure. The guide shaft 5 has a shaft hole 6a and a key groove 6
non-rotating screw 6 having b and a male screw 6c formed on the outer peripheral surface thereof
Is not relatively rotatable and is slidably inserted in the vertical direction so that the spring 7
(See FIG. 2), the upper limit of the non-rotating screw 6 is regulated by bringing the upper surface of the non-rotating screw 6 into contact with the set screw 5d screwed to the upper end of the guide shaft 5. This guide shaft 5
A total of four guide cylinders 8 are erected on each of the left and right sides of the pair at predetermined intervals in the front-rear direction.

A guide pin 9 is loosely inserted in each of the guide cylinders 8 so as to be vertically slidable, and a spring 11 urges the guide pins 9 upward. Therefore, the biasing force formed by the sum of the spring 7 and the spring 11 is set to be larger than the weight of the assembly of the lid bodies 20 described later. In addition, the upper end of the guide pin 9 is attached to the rectangular lifting plate 12 made of a magnetic material such as an iron plate by screws or welding so that the lifting plate 12 can be moved in parallel while maintaining a horizontal state. To

Further, the non-rotating screw 6 and the female screw 1 on the inner peripheral surface
A cylindrical rotatable screw 13 provided with 3a is screwed to form a screw pair, and a flange portion 13b that covers the upper end portion of the rotatable screw 13 and projects in the outer peripheral direction is provided, and the non-rotating screw 6 is rotated. The pinion 14 is fixedly installed so that the center and the axis line coincide with each other. The pinion 14 is made to project from a hole formed substantially in the center of the elevating plate 12, and the flange portion 13b is fixed to the elevating plate 12 by a bearing member 15 so as to restrain the vertical movement of the rotatable screw 13. Is rotatably attached to the lifting plate 12. 1 and 2, 16 is a magnet provided on the top plate 10f,
When the lid is closed, the lifting plate 12 is sucked.

On the other hand, a lid 20 for covering the keyboard portion 1 of the musical instrument body 10 and the manipulator 3 and the like arranged in the vicinity thereof from above corresponds to the lower surface of the rear end and the slope portion 10g formed on the upper surface of the musical instrument body 10. The inclined surface 20a is formed. On the lower surface of the lid body 20, the key 2 is placed at a position separated by a predetermined distance from the center in the width direction to the left and right.
The movable sliders 21a of the sliding pairs 21, such as dovetail guides, are fixed in parallel to the longitudinal direction of, and the fixed guides 21b on the guide side are fixed on the elevating plate 12. The lifting plate 12, the bearing member 15, the sliding pair 21, and the like constitute a lid body supporting means that allows relative movement in the front-rear direction while keeping the distance between the rotatable screw 13 and the lid body 20 constant.

Further, a rack 22 extending in the front-rear direction parallel to the movable slider 21a is fixedly mounted on the lower surface of the lid body 20 substantially in the center in the left-right direction, and meshes with a pinion 14 fixed to the rotatable screw 13. Then, by moving the lid body 20 in the front-back direction, the rack 22 rotates the rotatable screw 13 in both forward and reverse directions via the pinion 14, and the lid body 20 is moved up and down by the lead of the screw for each rotation. .

Next, the operation of the first embodiment having the above construction will be described mainly with reference to FIGS. 3 and 4.
In the fully opened state of the lid shown in FIG. 3, the key 2 and the operator 3 are completely opened. Even in this state, the lid body 20 is low in height and the player can see the audience side through the gap between the lid body 20 and the musical instrument body 10. Therefore, the feeling of pressure by the lid body during performance is alleviated. The gap can be set by appropriately selecting the pitch of the screw.

Further, the sounds from the left and right speakers 4A and 4B built in the instrument body 10 are reflected on the back surface of the lid body 20 and are radially sent out from the body body, and at the same time, the lid body 20 itself acts as a sub diaphragm. Together with this, the acoustic characteristics are improved. Especially, the low-pitched part (low range) is extended and the volume is increased.

When the lid 20 is pulled forward (to the key side) from this state, the pinion 14 is rotationally driven in the clockwise direction (FIG. 1) by the rack 22 that moves together with the lid 20, and a rotatable screw integrated with this. 13 rotates in the same direction. Since this rotatable screw is screwed into the non-rotatable screw 6 on the instrument body side, when the rotatable screw 13 rotates in the clockwise direction, the rotatable screw 13 descends by the amount corresponding to the lead of the screw for each rotation. After the state shown in FIG. 4 (a), the state becomes close to the lid shown in FIG. 4 (b).

Here, when the performer pushes down the lid body 20 from above, the lifting plate 1 that moves together with the lid body 20 in the vertical direction.
The rotatable screw 1 in which the pin 9 of 2 descends against the urging force of the spring 11 and moves up and down with the lifting plate 12
3 lowers the non-rotating screw 6 against the biasing force of the spring 7,
The lid 20 stops when it comes into contact with the top plate 10f of the musical instrument body 10. In this state, the magnets 16 and 16 provided on the top plate 10f attract the lifting plate 12, and the lid 2
Even if the pressing down of 0 is released, the lid body 20 that moves in the up-down direction via the elevating plate 12 is held in the closed state shown in FIG. 4C. Even in this state, the instrument body 10
Between the front plate 10a and the lid body 20 of FIG.
(See (c)) is formed. This gap G not only allows the front plate upper surface 10a 'to be unobstructed by fingers and wrists when playing with the lid 20 opened, but also when the lid 20 is opened from the closed state. A finger is hooked on the lower surface 20b of the front end to easily release the magnetic force of the magnet 16.

On the contrary, in order to open the lid body 20 from the closed state shown in FIG. 4C, the lid body 20 may be pushed upward from the gap G against the attraction force of the magnet 16.
After the lifting plate 12 is separated from the magnet 16,
Due to the biasing force of the springs 7 and 11, the non-rotating screw 6 rises until it comes into contact with the set screw 5d of the guide shaft 5. At the same time as the rotatable screw 13 screwed together with this rises, the pin 9 also rises, and the elevating plate 12 automatically enters the opening preparation state shown in FIG.

When the lid body 20 is lightly pushed rearward from this state, the rotatable screw 13 is rotationally driven in the counterclockwise direction (FIG. 1) via the pinion 14 by the rack 22 integrated with the lid body 20 and every rotation thereof. Only the lead of the screw can be rotated
Rises. As a result, the lid body 20 moves upward while retracting, and goes into the fully open state shown in FIG. 3 through the state of FIG.

At this time, if the pressing of the lid 20 to the rear is stopped at any position where at least the keyboard portion 1 of the musical instrument body 10 is opened, the rotation of the rotatable screw 13 is also stopped and the lid 2
Zero can be held in any open position. By using this function, it is possible to obtain a desired acoustic effect by the degree of opening of the lid 20, similar to the adjustment of the acoustic effect by opening and closing the lid of the grand piano, for example. In FIG. 2, a conical protruding portion 20c indicated by an imaginary line is hung on a portion of the lower surface of the lid body 20 facing the speakers 4A and 4B by utilizing a gap between the lower surface of the lid body and the upper surface of the top plate 10f. If provided, the sounds emitted from the speakers 4A and 4B can be emitted radially, and a kind of horn effect can be obtained.

According to the first embodiment, in addition to the effects described above, the weight does not directly act in the closing direction unlike the conventional rotary lid, so that the lid 20 and the musical instrument main body are not affected. 1
The risk of pinching your finger between 0 and 0 decreases. Further, since the lid body 20 is once lifted and then pushed rearward, the leads of the screw pair can be small, the threaded portion can be easily processed, and the production cost can be reduced. Very smooth rotation is expected when opening and closing. In addition, in the first embodiment, the non-rotating screw side has a double structure that can move up and down within a predetermined range and cannot relatively rotate, but the rotatable screw side can have the same double structure.

Next, FIG. 6 is a sectional view similar to FIG. 3 showing the second embodiment of the present invention with the lid half opened, and the same parts as those of the first embodiment are designated by the same reference numerals. The description is omitted.

In the second embodiment, the cylindrical non-rotating screw 26 provided with the female screw 26a is fixed to the instrument body 10 side,
A rotatable screw 33 having a male screw 33a screwed to the female screw 26a is rotatably attached to the lifting plate 12 side,
The partition plate 2 in which the pinion 14 is fixedly mounted on the upper end of the rotatable screw 33 and a non-threaded guide portion 33b is provided on the lower portion to form the guide portion 33b inside the non-rotatable screw 26.
6b is inserted into the guide hole 26c at the center, and the non-rotating screw 26 and the rotatable screw 33 form a screw pair. In addition, it is preferable that the thread portion of the screw pair is a multi-threaded screw and has a large lead. Further, the guide tube 8 is provided on the side of the lifting plate 12 and the guide pin 9 is provided on the side of the musical instrument body 10, and the springs 7 and 11 of the first embodiment are not provided.

In the second embodiment, as described above, the non-rotating screw 26 on the instrument body 10 side is a female screw, and the rotatable screw 33 on the lifting plate 12 side is a male screw. Although it is different from the first embodiment in that it cannot be moved up and down and the guide cylinder 8 and the guide pin 9 are replaced, the other configurations are the same as those in the first embodiment.

When the lid body 20 is pushed rearward from the half-opened state of the lid body shown in the figure, the rack 22 rotates the rotatable screw 33 via the pinion 14, and the rotatable screw 33 moves up by the amount of the lead. When the rotatable screw 33 rises, the lid body 20 moves upward through the elevating plate 12 and the sliding pair 21, and moves backward to open the lid. On the contrary, when the lid body 20 is pulled forward from the state shown in the drawing, the rotatable screw 33 reversely rotates and descends by the amount of the lead, and the lid body 20 advances while descending to the closed lid state.

According to the second embodiment, the lid body is lifted and retracted and opened by simply pressing the lid body in the closed state rearward, and from this state, the lid body is slightly pulled forward. Since the lid body moves downward and is closed by the above, the opening and closing of the lid body becomes easier. Further, since it is preferable to use a multi-thread screw that can take a large lead in the screw part of the screw pair, the processing cost of the screw is slightly increased, but the non-rotating screw 2
Since 6 does not have to be moved up and down, the configuration is simplified.

Further, FIG. 7 is a plan view similar to FIG. 1 in which only the lid body of the third embodiment of the present invention is removed, and FIG. 8 is FIG.
FIG. 6 is a side sectional view showing a half-opened state of the lid along the line D-D in FIG.
In this third embodiment, the lid opening / closing operation in the second embodiment is electrically operated. In FIGS. 7 and 8, the same parts as those in the first and second embodiments are designated by the same reference numerals. Is shown.

As shown in FIG. 8, the bottom plate 1 of the instrument body 10
The geared motor 40, in which the rotation of the output shaft 40a is reduced by the reduction gear group, is fixedly installed inside the cylindrical non-rotating screw 26 that is erected at 0e, and the output shaft 40a is rotated by a key and a key groove. It is inserted so as to move in the rotational direction. Then, the pinion 14 is rotated by rotating the output shaft 40a in both forward and reverse directions to drive the rack 22 to move the lid 20 back and forth to close or open the lid.

Then, a first limit switch RMSW1 consisting of a micro switch for restricting the closing limit of the lid 20 is provided on the lower surface of the inclined surface 10g of the top plate 10f, and the lower limit of the lid 20 is opened on the lower surface of the lid 20. A second limit switch RMSW2 consisting of a regulating micro switch is provided,
When the lid is closed, the inclined surface 20a formed on the lower surface of the rear end of the lid 20 contacts the actuator of the first limit switch RMSW1, and when the lid is opened, the actuator of the second limit switch RMSW2 is in front of the fixed guide 21b of the sliding pair 21. To be able to abut.

Further, operators 41 and 42 of the first and second manual switches SW1 and SW2 (FIG. 9) for opening and closing the lid 20 are provided on a part of the front plate 10a of the musical instrument body 10.
FIG. 9 is an electric circuit diagram showing the opened state of the third embodiment. In the figure, S1 and S2 are the first and second manual switches S, respectively.
Interlocking switch interlocking with W1 and SW2,
The manual switches SW1 and SW2 are of a self-resetting type which is always biased by a spring toward the terminal b.

When the lid 20 is fully opened, the actuator of the RMSW 1 is in the open state as shown in FIGS. 7 and 8, and the common terminal of the microswitch is switched to the normally closed side to be in the c-b connection state. As shown in FIG. 8, the actuator of the RMSW2 has a fixed guide 21b.
Is in contact with the front surface of C and is in the c-a connection state (open).
Further, SW1 and SW2 are both on the b side, S1 and S2 are both open, and the power supply voltage + V and the motor 40 are cut off.

In this state, the operator 42 is pressed to push SW2
Is switched to the a side and S2 closes at the same time, and the voltage + V
Is guided to the ground side through RMSW1, S2, SW1, motors 40, SW2, and the output shaft 40a of the motor 40 rotates the pinion 14 clockwise through the rotatable screw 33 in FIG. As a result, the rack 22 is driven forward, and the actuator of the RMSW2 is immediately opened, so that the RMSW2 is closed. When the lid 20 further advances, the rotatable screw 33 causes the lifting plate 12 and the sliding pair 2 to move.
The lid 20 is lowered through 1 to be in a fully closed state. In this state, the lid 20 pushes the actuator of the RMSW1, so the RMSW1 is opened. At this time, the voltage supply to the motor 40 is stopped even if the operator 42 is continuously pressed to close S2. Therefore, it is only necessary to visually confirm that the movement of the lid 20 has stopped and then release the pressing of the operator 42.

On the contrary, when the operator 41 is pressed from the above-mentioned closed state and SW1 is switched to the side a, S1 is closed and the voltage + V is S1, RMSW2, SW because RMSW1 is open.
2, is guided to the ground side through the motor 40, SW1, and the output shaft 40a of the motor 40 rotates in the direction opposite to that when the lid is closed,
The pinion 14 is rotated counterclockwise in FIG. This drives the rack 22 to the rear, so the RMS
When W1 is closed and the lid body 20 is further retracted, the rotatable screw 33 raises the lid body 20 and opens the RMSW2.

At this time, if the pressing of the operator 41 is released during the opening of the lid body, SW1 is on the b side and S1 is open so that the voltage is not applied to the motor 40, and the lid body 20 is moved at an arbitrary position. It can be stopped. Further, even if the operator 41 is continuously pressed and S1 is closed, when the lid body 20 is fully opened, the RMSW2 is opened and the motor 40 stops rotating. In this case as well, the pressing of the operator 41 may be released after visually recognizing that the movement of the lid 20 has stopped.

Furthermore, by changing a part of the above electric circuit,
It is also possible to release the self-holding at the fully open or fully closed position of the lid body 20 by closing the SW1 and SW2 once without continuously pressing the operators 41 and 42 using the flip-flop circuit. . In this case, the lid 20 cannot be stopped in the middle of opening, but the lid opening / closing operation can be further facilitated.

In each of the above-mentioned embodiments, the opening and closing of the lid body is performed in two steps, the one-step operation is performed, and the non-rotating screw on the instrument body side is a male screw.
Although the description using the female screw, the manual rotation of the rotatable screw, the electric rotation, and the like are described separately, these can be appropriately combined. Further, in the above-described embodiment, the lid covers the keyboard and various operators, but it is also possible to cover only the keyboard or various operators.

[0042]

As described above, in the lid opening / closing device for a keyboard instrument according to the present invention, since the lid moves up and down in parallel with the instrument body, the height of the lid should be lowered even when fully opened. In addition, it is possible to look backward through the gap between the lid and the instrument main body, which makes it possible to reduce the feeling of pressure during performance and to open and close the lid in the same way throughout the entire stroke. This can be done by force, and the risk of accidentally pinching your finger between the instrument and the instrument body when opening the lid is reduced.

In addition, since the lid body is an integral structure, it is robust, and in the case of a closed lid, the keyboard portion and operators can be protected safely, and the lid body penetrates into the instrument body. Since it does not occur, sufficient internal space is secured.

Also, when the lid is opened, the lid can be made to reflect the sound from the instrument main body and act as a sub-vibration plate, so that the acoustic characteristics are improved and particularly the extension of the bass range is improved. Become. Furthermore, by stopping the lid at an arbitrary position during opening and changing the degree of opening, the acoustic characteristics also change, and the performer can select a desired sound.

[Brief description of drawings]

FIG. 1 is a plan sectional view taken along the line AA of FIG. 2 in which only a lid body of a first embodiment of the present invention is removed.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a side sectional view taken along line C-C of FIG. 1.

FIG. 4 is an explanatory view of the same operation.

FIG. 5 is an exploded perspective view showing the structure of the non-rotating screw.

FIG. 6 is a side sectional view showing a lid half-opened state according to the second embodiment of the present invention.

FIG. 7 is a sectional view of the third embodiment of the present invention with only the lid removed.

8 is a side sectional view showing the lid half-opened state, which is also taken along the line D-D in FIG. 7. FIG.

FIG. 9 is also an electric circuit diagram thereof.

[Explanation of Codes] 1 ... Keyboard part, 2 ... Key, 3, 41, 42 ... Operator, 4A,
4B: speaker, 5 ... guide shaft, 6, 26 ... non-rotating screw, 7, 11 ... spring, 8 ... guide tube, 9 ... guide pin,
10 ... Instrument body, 12 ... Elevating plate, 13, 33 ... Rotating screw, 14 ... Pinion, 15 ... Bearing member, 16 ... Magnet, 20 ... Lid, 21 ... Sliding pair, 22 ... Rack, 40 ... Motor

Claims (1)

[Claims] 1. A lid opening and closing device for a keyboard instrument, comprising a lid for covering an upper surface of a musical instrument body, wherein a non-rotating screw is provided on the musical instrument body so that the axis line is perpendicular to the non-rotating screw, and the non-rotating screw is screwed on the non-rotating screw. A screw pair consisting of a rotatable screw to be fitted, a pinion fixed to the rotatable screw with its axis aligned, and a pinion fixed to the lid in parallel with the longitudinal direction of the key of the keyboard. A rack which can be engaged with each other, and a lid support means which is interposed between the rotatable screw and the lid and allows relative movement in the front-rear direction while maintaining a constant vertical distance therebetween. A lid opening / closing device for a keyboard instrument, which is characterized by having.