JP3404821B2 - Keyboard instrument lid opening and closing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover opening and closing device for a keyboard musical instrument which covers a keyboard portion of a musical instrument main body and various operators disposed near the keyboard portion. 2. Description of the Related Art Conventionally, as an opening / closing device for a lid that covers an upper surface of a musical instrument such as an electronic organ or the like, a rear end of the lid is pivotally hinged to the musical instrument main body. When the lid is opened, a rotary type that stands on the instrument body has been widely used. In addition, there is also a type in which the lid is slidable in the front-rear direction so that the lid can be stored in the instrument body when the lid is opened, and a type in which the lid is formed into a durable door shape and wrapped in 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 type 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 body via 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.When the lid is closed, the rotation speed of the lid is reduced so that a finger is placed between the lid and the main body. In some cases, there is no danger that the player will be pinched, and at the time of opening the cover, the player's feeling of pressure will be reduced. [0004] Further, as another example of an improved type of the rotary type lid, as shown in, for example, Japanese Utility Model Application Laid-Open No. 61-128695, a rear end portion is rotatably mounted on a musical instrument main body. The lid is composed of first and second lids which are hinged so as to be freely foldable, and the height of the lid erected on the main body when the lid is opened is reduced to reduce the feeling of oppression during playing. Some of them are also known. [0005] However, such a conventional lid opening / closing device for a keyboard instrument in which the lid is slidably stored in the instrument body is particularly portable. When the main body of the musical instrument is miniaturized, such as a keyboard electronic musical instrument, there is a possibility that a storage space for various electric components such as a circuit board cannot be secured. Further, the construction disclosed in Japanese Utility Model Laid-Open Publication No. Hei 3-8392 has a complicated structure, restricting the degree of freedom in design, and requires a link mechanism and a damper mechanism to be provided in the instrument body. There is a possibility that the space may be insufficient as in the case of the sliding lid. Furthermore, Shokai 61-
The structure disclosed in Japanese Patent No. 128695 has a simplified structure. However, since the lids are hinged to each other, the hinges are damaged when the hand is inadvertently pressed or a heavy object is dropped. There was a fear. In any case, the effect of improving the acoustic characteristics by adjusting the degree of opening of the lid could not be obtained. The present invention has been made in view of the above points, and has as its object to reduce the feeling of oppression during a performance and to improve the sound effect. In order to achieve the above object, the present invention provides a cover opening / closing device for a keyboard instrument provided with a cover covering an upper surface of a musical instrument main body. A screw pair consisting of a non-rotating screw provided non-rotatably and a rotatable screw screwed to the non-rotating screw, and a pinion fixed to the rotatable screw so that its axis coincides with the rotatable screw.
A rack fixed to the lid in parallel with the longitudinal direction of the key of the keyboard portion and capable of meshing with the pinion; and a rack interposed between the rotatable screw and the lid, and a vertical direction between the two. It is an object of the present invention to provide a lid opening / closing device for a keyboard instrument having a lid supporting means for permitting relative movement in the front-rear direction while keeping the distance constant. The lid opening / closing device for a keyboard instrument according to the present invention is constructed as described above, so that the rack on the lid side holds the pinion simply by lightly pressing the front end of the closed lid backward. By rotating, the rotatable screw integrated with the pinion can be rotated. As a result, the rotatable screw screwed into the non-rotating screw on the instrument body side rises by that lead,
At the same time as the lid moves rearward, it also moves upward to open the lid. At this time, if the rearward 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.
Conversely, when the lid is pulled forward from the open state, the rotatable screw is rotated in the reverse direction to bring the lid into the closed state. Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows the first embodiment in which the present invention is applied to a keyboard electronic musical instrument.
2 is a sectional plan view taken along line BB in FIG. 1; FIG. 3 is a sectional side view taken along line CC in FIG. 1; 1 shows only a lid opening / closing device including a lid not shown in FIG. The instrument body 10 is divided into a front plate 10a, left and right side plates 1
0b, 10c, a rear plate 10d, and a bottom plate 10e to form a hexagonal box shape with both rear corners cut out.
A top plate 10f is provided, part of which is applied to the panel surface, and a keyboard portion 1 having an open upper portion is provided at the front thereof. A key 2 composed of a large number of white keys 2A and black keys 2B is arranged on a keyboard 1, and a tone switch such as an organ or a piano, a waltz switch, a lock, etc. A variety of operators 3 such as a rhythm switch are disposed, and speakers 4A and 4
B is provided, and when a key is pressed, a corresponding key switch (not shown) is closed and the tone generation circuit is activated,
A musical sound is generated from the speakers 4A and 4B. A guide shaft 5 having a cylindrical portion 5a, a key portion 5b, and a flange portion 5c is erected substantially at the center of the bottom plate 10e of the musical instrument body 10 having the above-described structure, as shown in FIG. The guide shaft 5 has a shaft hole 6 a and a keyway 6.
b and a non-rotating screw 6 having a male screw 6c formed on the outer peripheral surface.
Is slidably inserted in the vertical direction without relative rotation.
2 (see FIG. 2), the upper end of the non-rotating screw 6 is regulated by bringing the upper surface of the non-rotating screw 6 into contact with a 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 at predetermined intervals in the front-rear direction. A guide pin 9 is loosely inserted into these guide cylinders 8 so as to be slidable up and down, and is urged upward by a spring 11. Therefore, the urging force formed by the sum of the spring 7 and the spring 11 is set to be larger than the weight of an assembly of the lid 20 described later. Also, the upper end of the guide pin 9 is attached to a rectangular elevating plate 12 made of a magnetic material such as an iron plate by a screw or welding, respectively, so that the elevating plate 12 can move in a vertical direction while maintaining a horizontal state. To The non-rotating screw 6 has a female screw 1 on the inner peripheral surface.
A screw pair is formed by screwing a cylindrical rotatable screw 13 provided with 3a, and a flange portion 13b that covers an upper end portion of the rotatable screw 13 and protrudes in an outer peripheral direction is provided. The pinion 14 is fixed so that the center and the axis are aligned. The pinion 14 is projected from a hole formed substantially in the center of the lifting plate 12, and the flange 13 b is fixed to the lifting plate 12 by a bearing member 15 so as to restrain the vertical movement of the rotation screw 13. Is rotatably mounted on the lifting plate 12. 1 and 2, reference numeral 16 denotes a magnet provided on the top plate 10f.
When the lid is closed, the lifting plate 12 is suctioned. On the other hand, a lid 20 for covering the keyboard portion 1 of the musical instrument body 10 and the operator 3 disposed in the vicinity thereof from above corresponds to a slope portion 10g formed on the upper surface of the musical instrument body 10 on the lower rear end surface. The inclined surface 20a is formed. The key 2 is located on the lower surface of the lid 20 at a position spaced a predetermined distance left and right from the center in the width direction.
In parallel with the longitudinal direction, the movable slider 21a of the sliding pair 21 such as a dovetail guide is fixed, and the fixed guide 21b on the guide side is fixed on the lifting plate 12. The lifting plate 12, the bearing member 15, the sliding pair 21 and the like constitute lid supporting means for allowing relative movement in the front-rear direction while keeping the distance between the rotatable screw 13 and the lid 20 constant. Further, a rack 22 extending in the front-rear direction in parallel with the movable slider 21a is fixed to the lower surface substantially at the center in the left-right direction of the lid 20, and meshes with a pinion 14 fixed to the rotatable screw 13. Then, by moving the lid 20 in the front-rear direction, the rack 22 rotates the rotatable screw 13 in both the forward and reverse directions via the pinion 14, and moves the lid 20 up and down by the amount of the screw lead every rotation. . Next, the operation of the first embodiment having the above configuration will be described mainly with reference to FIGS.
In the fully opened state shown in FIG. 3, the key 2 and the operating element 3 are completely opened. Even in this state, the lid 20 is low in height and the player can see the audience side even through the gap between the lid 20 and the instrument body 10, so that the feeling of oppression due to the lid during the performance is alleviated. The setting of the gap can be made by appropriately selecting the pitch of the screws. The sound from the left and right speakers 4A and 4B built into the instrument main body 10 is reflected on the back surface of the lid 20 and is radially sent out from the main body, and the lid 20 itself acts as a sub diaphragm. Together with this, the acoustic characteristics are improved. In particular, the bass (low range) is extended, and the volume is also increased. When the lid 20 is pulled forward (key side) from this state, the pinion 14 is driven to rotate clockwise (FIG. 1) by the rack 22 which moves with the lid 20, and a rotatable screw integrated therewith. 13 rotates in the same direction. Since the rotatable screw is screwed to the non-rotatable screw 6 on the instrument body side, when the rotatable screw 13 rotates clockwise, the rotatable screw 13 descends by the amount of the screw lead every rotation. After the state shown in FIG. 4A, the state immediately before the closing of the lid shown in FIG. Here, when the player presses the lid 20 from above, the lifting plate 1 which moves up and down with the lid 20 is moved upward.
2 pin 9 descends against the urging force of the spring 11 and the rotatable screw 1
3 lowers the non-rotating screw 6 against the urging force of the spring 7,
The cover 20 stops when the lid 20 comes into contact with the top plate 10f of the instrument main body 10. In this state, the magnets 16, 16 provided on the top plate 10f attract the lifting plate 12, and the lid 2
Even when the pressing of “0” is released, the lid 20 that moves up and down with the elevating plate 12 is held in the closed state shown in FIG. Note that even in this state, the instrument body 10
Is slightly spaced G between the front plate 10a and the lid 20 (see FIG. 4).
(C)) is formed. This gap G not only prevents the fingers and wrists from touching the front plate upper surface 10a 'when the performance is performed with the lid 20 opened, but also allows the lid 20 to be opened from the closed state. The finger is hooked on the lower surface 20b of the front end of the magnet 16 to easily release the magnetic force of the magnet 16. Conversely, to open the lid 20 from the closed state shown in FIG. 4C, the lid 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,
The non-rotating screw 6 is raised by the urging force of the springs 7 and 11 until it comes into contact with the set screw 5d of the guide shaft 5. Simultaneously with this, the rotatable screw 13 to be screwed rises and at the same time the pin 9 rises, and the elevating plate 12 automatically enters the opening preparation state shown in FIG. When the lid 20 is gently pressed backward from this state, the rotatable screw 13 is rotated counterclockwise (FIG. 1) via the pinion 14 by the rack 22 integrated therewith, and every rotation thereof. Rotatable screw 13 for screw lead
Rises. As a result, the lid 20 is retracted while ascending, and reaches the fully opened state shown in FIG. 3 through the state of FIG. At this time, when the rearward pushing of the lid 20 is stopped at least at an arbitrary position where the keyboard 1 of the musical instrument body 10 is opened, the rotation of the rotatable screw 13 is also stopped, and the lid 2 is stopped.
0 can be held in any open position. By using this function, it is possible to obtain a desired sound effect depending on the degree of opening of the lid 20, similarly to the adjustment of the sound effect by opening and closing the lid of a grand piano, for example. In FIG. 2, a conical protruding portion 20c indicated by an imaginary line is hung down on a portion of the lower surface of the lid 20 facing the speakers 4A and 4B using a gap between the lower surface of the lid and the upper surface of the top plate 10f. When 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 as in the case of the conventional rotary lid, so that the lid 20 and the instrument main body are not used. 1
The risk of pinching the finger between zero and zero is reduced. In addition, since the lid 20 is once raised and then pressed rearward, the lead of the screw pair can be small, the processing of the screw portion can be facilitated, and the production cost can be reduced. Very smooth rotation is expected when opening and closing. In the first embodiment, the non-rotatable screw side has a double structure that can move up and down within a predetermined range and cannot rotate relative to each other. However, the rotatable screw side may have a similar double structure. FIG. 6 is a sectional view similar to FIG. 3 but showing a second embodiment of the present invention in a half-open state of the lid. The same parts as those in the first embodiment are designated by the same reference numerals. Description is omitted. In the second embodiment, a cylindrical non-rotating screw 26 provided with a female screw 26a is fixedly provided on the instrument body 10 side.
A rotatable screw 33 having a male screw 33a screwed to the female screw 26a is rotatably mounted on the lifting plate 12 side,
A partition plate 2 in which the pinion 14 is fixed to the upper end of the rotatable screw 33 and a guide portion 33b which is not threaded is provided at the lower portion, and the guide portion 33b is formed inside the non-rotating screw 26.
A screw pair is formed by inserting the non-rotating screw 26 and the rotatable screw 33 through the guide hole 26c at the center of the 6b. In addition, it is preferable that the thread portion of this screw pair is a multi-start thread and the lead is as large as possible. Further, the guide cylinder 8 is provided on the lift plate 12 side and the guide pin 9 is provided on the musical instrument main body 10 side, and the springs 7 and 11 of the first embodiment are not provided. The second embodiment is different from the first embodiment in that the non-rotating screw 26 on the musical instrument body 10 is a female screw and the rotatable screw 33 on the lifting plate 12 is a male screw. The third embodiment is different from the first embodiment in that it cannot be moved up and down and that the guide cylinder 8 and the guide pin 9 are exchanged, but the other configuration is the same as the first embodiment. Now, when the lid 20 is pressed backward from the illustrated lid half-open state, the rack 22 rotates the rotatable screw 33 via the pinion 14, and the rotatable screw 33 rises by the lead. With the rise of the rotatable screw 33, the lid 20 is raised and retracted via the elevating plate 12 and the sliding pair 21 to open the lid. Conversely, when the lid 20 is pulled forward from the state shown in the figure, the rotatable screw 33 rotates in the reverse direction and descends by the amount corresponding to the lead, and the lid 20 moves forward while descending to the closed state. According to the second embodiment, the lid in the closed state is retracted and opened by raising the lid only by gently pressing the lid backward. From this state, the lid is simply pulled forward. As the lid moves forward and closes while descending, the lid can be more easily opened and closed. In addition, since it is preferable to use a multi-start thread which can take a large lead in the thread part of the screw pair, the processing cost of the screw is slightly increased, but the non-rotating screw 2
6 does not need to be moved up and down, so the configuration is simplified. FIG. 7 is a plan view similar to FIG. 1 with only the lid of the third embodiment of the present invention removed, and FIG.
FIG. 4 is a side sectional view showing the lid half-opened state along the line DD of FIG.
In the 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 denoted by the same reference numerals. Shown. As shown in FIG. 8, the bottom plate 1 of the musical instrument body 10
A geared motor 40 in which the rotation of the output shaft 40a is reduced by a group of reduction gears is fixed inside the cylindrical non-rotating screw 26 erected at 0e, and the output shaft 40a is rotated by a key and a key groove. To be rotated in the rotation direction. Then, the configuration is shown in which the pinion 14 is rotated by rotating the output shaft 40a in both the forward and reverse directions, the rack 22 is driven, the lid 20 is moved back and forth, and the lid is closed or opened. A first limit switch RMSW1 composed of a micro switch for restricting the closing of the lid 20 is provided on the lower surface of the inclined surface 10g of the top plate 10f, and the opening of the lid 20 is set on the lower surface of the lid 20. Providing a second limit switch RMSW2 consisting of a micro switch to regulate,
When the lid is closed, an inclined surface 20a formed on the lower surface of the rear end of the lid 20 abuts on the actuator of the first limit switch RMSW1, and when the lid is opened, the actuator of the second limit switch RMSW2 faces the front surface of the fixed guide 21b of the sliding pair 21. To be able to abut. Further, operators 41 and 42 of 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 open state of the third embodiment. In the figure, S1 and S2 are first and second manual switches S
These are interlocking switches that interlock with W1 and SW2, respectively.
The manual switches SW1 and SW2 are of a self-return type constantly biased by a spring toward the terminal b. When the lid 20 is fully opened, as shown in FIGS. 7 and 8, the actuator of the RMSW 1 is in the open state, 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 RMSW2 has a fixed guide 21b as its actuator.
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 shut off. In this state, the operator 42 is pressed to switch SW2.
Is switched to the a side, S2 is closed at the same time, and the voltage + V
Is guided to the earth side through RMSW1, S2, SW1, motor 40, SW2, and the output shaft 40a of the motor 40 rotates the pinion 14 clockwise in FIG. As a result, the rack 22 is driven forward and the actuator of the RMSW 2 is immediately opened, so that the RMSW 2 is closed. When the lid 20 is further advanced, the rotatable screw 33 moves the lifting plate 12 and the sliding pair 2.
The cover 20 is lowered via the first member 1 to be in a fully closed state. In this state, the lid 20 pushes the actuator of the RMSW1, so that the RMSW1 is opened. At this time, the voltage supply to the motor 40 is stopped even if the operator 42 is kept pressed and S2 is closed. Therefore, the pressing of the operating element 42 may be released after visually confirming that the movement of the lid 20 has stopped. Conversely, when the operator 41 is pressed from the above-mentioned closed state and the switch SW1 is switched to the side a, S1 is closed and the voltage + V becomes S1, RMSW2, SW because RMSW1 is open.
2, guided to the ground side through the motor 40 and the SW1, 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. As a result, the rack 22 is driven backward, so that the RMS
When W1 is closed and the lid 20 is further continuously retracted, the rotatable screw 33 raises the lid 20 to open the RMSW2. At this time, when the pressing of the operation element 41 is released in the middle of opening the lid, SW1 is set to the b side, S1 is opened, and no voltage is applied to the motor 40, so that the lid 20 is moved to an arbitrary position. Can be stopped. Further, if the lid 20 is fully opened even if the operator 41 is kept pressed and S1 is closed, the RMSW2 is opened and the motor 40 stops rotating. Also in this case, the pressing of the operation element 41 may be released after visually confirming that the movement of the lid 20 has stopped. Further, a part of the above electric circuit is changed,
Even if the switches 41 and 42 are not continuously pressed using the flip-flop circuit, the switches SW1 and SW2 are held once when they are closed once, and the self-holding can be released when the lid 20 is fully opened or fully closed. . In this case, although the lid 20 cannot be stopped in the middle of opening, the lid opening / closing operation can be further facilitated. In each of the above embodiments, the opening and closing of the lid are performed in two stages, the opening and closing are performed in one stage, the non-rotating screw on the instrument body side using a male screw,
Although the one using a female screw, the one rotating a rotatable screw manually, and the one rotating electrically are described separately, these can be combined as appropriate. In the above embodiment, the lid covers the keyboard and the various controls, but it is also possible to cover only the keyboard or only the various controls. As described above, the cover opening / closing device for a keyboard instrument according to the present invention moves in parallel on the instrument body while the cover moves up and down, so that the height of the cover can be maintained even when the cover is fully opened. It can be lowered and the back can be seen through the gap between the lid and the instrument body, so that it is possible to reduce the feeling of oppression during the performance and to open and close the lid over the entire stroke. The same force can be used to reduce the risk of inadvertently pinching a finger between the instrument and the instrument body when the lid is opened. In addition, since the lid is of an integral structure, it is robust, and in the case of a closed lid, it is possible to safely protect the keyboard and the controls, and the lid enters the instrument body. Therefore, a sufficient internal space is secured. When the lid is opened, the lid can reflect the sound from the instrument body or act as a sub-vibration plate, so that the acoustic characteristics are improved, and particularly, the extension of the bass range is improved. Become. Further, by stopping the lid at an arbitrary position in the middle of opening and changing the degree of opening, the acoustic characteristics also change, and the player can select a desired sound.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan sectional view taken along line AA of FIG. 2 with only a lid of a first embodiment of the present invention removed. FIG. 2 is a front sectional view along the line BB of FIG. 1; FIG. 3 is a side sectional view taken along the line CC of FIG. 1; FIG. 4 is an operation explanatory view of the same. FIG. 5 is an exploded perspective view showing the configuration of the non-rotating screw. FIG. 6 is a side sectional view showing a lid half-opened state according to a second embodiment of the present invention. FIG. 7 is a sectional view of a third embodiment of the present invention, in which only a lid is removed. FIG. 8 is a side sectional view showing the lid half-opened state along the line DD of FIG. 7; FIG. 9 is an electric circuit diagram of the same. [Description of Signs] 1 ... keyboard portion, 2 ... key, 3,41,42 ... operator, 4A,
4B: speaker, 5: guide shaft, 6, 26: non-rotating screw, 7, 11: spring, 8: guide cylinder, 9: guide pin,
DESCRIPTION OF SYMBOLS 10 ... Instrument main body, 12 ... Elevating plate, 13 and 33 ... Rotatable screw, 14 ... Pinion, 15 ... Bearing member, 16 ... Magnet, 20 ... Lid, 21 ... Sliding pair, 22 ... Rack, 40 ... Motor

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Claims (1)

(57) [Claim 1] In a lid opening and closing device for a keyboard instrument provided with a lid for covering an upper surface of a musical instrument main body, a non-rotatably provided with the axis perpendicular to the musical instrument main body. A screw pair consisting of a rotating screw and a rotatable screw screwed to the non-rotating screw, a pinion fixed along the axis of the rotatable screw, and a longitudinal direction of a key of the keyboard portion on the lid body And a rack fixed in parallel to the pinion and interposed between the rotatable screw and the lid, and a relative movement in the front-rear direction while maintaining a constant vertical distance between the two. And a cover supporting means for allowing the opening of the cover.