JP5447927B2 - Keyboard lid opening and closing device - Google Patents

Description

  The present invention relates to a keyboard lid opening / closing device used for a keyboard instrument such as an electronic piano.

  2. Description of the Related Art Conventionally, in a keyboard lid opening / closing device for a keyboard instrument, as described in Patent Document 1, a keyboard lid that covers a keyboard portion provided in the instrument body so as to be opened and closed is divided into a front lid and a rear lid. The divided front lid and rear lid are foldably connected to each other, and the rear lid is slid along the guide rail provided in the musical instrument case to the rear side in the musical instrument main body to be stored. Things are known.

In such a keyboard lid opening and closing device, when the keyboard instrument is not used, the front lid and the rear lid are pulled out to the upper side of the keyboard portion when the keyboard instrument is not used. By rotating it and opening it flat, the upper part of the keyboard is covered with the front cover and the rear cover, and when using a keyboard instrument, the front cover is folded over and superposed on the rear cover. By moving the lid along the guide rail together with the front lid, the keyboard lid is housed on the rear side in the instrument body.

  However, in such a conventional keyboard lid opening and closing device, when using a keyboard instrument, the front lid is folded over and superposed on the rear lid, and in this state is moved to the rear side in the instrument body and stored. Because of the configuration, the keyboard lid and its opening / closing structure are complicated, and the opening and closing operation of the keyboard lid is troublesome, and the front lid and the rear lid are folded and housed in the rear side of the instrument body. Therefore, there is a problem that the depth of the instrument body becomes longer and the entire instrument becomes larger.

  The problem to be solved by the present invention is to provide a keyboard lid opening / closing device that has a simple structure, can be easily opened and closed, and can reduce the overall size of the musical instrument.

In order to solve the above problems, the present invention includes the following components.
According to a first aspect of the present invention, in a keyboard lid opening / closing device that covers the keyboard portion provided in the musical instrument body so as to be freely opened and closed, the device is provided at a rear end portion of the keyboard lid and directed toward a side surface in the musical instrument body. A projecting support shaft; a shaft guide portion that is provided in a state inclined toward the lower rear side of the rear surface of the instrument body; and an upper rear end portion of the instrument body for movably guiding the support shaft. Provided with a lid guide portion for guiding the opening and closing operation of the keyboard lid, and the shaft guide portion is located at an upper end portion of the keyboard lid when the keyboard lid is opened at a predetermined angle from the closed state. A first fulcrum portion for restricting the position of the support shaft so as to be rotatable; and the keyboard lid is opened at the predetermined angle at a lower end portion of the shaft guide portion, and the support shaft is inclined rearward along the shaft guide portion. The support shaft can be rotated by abutting when moving to the lower side Holding said and a second fulcrum portion for erecting by tilting the fallboard obliquely rearward in this state, the lid guide portion, when opened from the closed state the keyboard lid to said predetermined angle, The support shaft is regulated to the first fulcrum portion of the shaft guide portion while guiding the inner surface of the rear side of the keyboard lid, and the keyboard lid is rotated in the direction to open the keyboard around the support shaft that is regulated. When the first restricting portion for moving the keyboard lid and the keyboard lid are opened at the predetermined angle, the support shaft is moved obliquely rearward and lower along the shaft guide portion to the second of the shaft guide portion. A keyboard lid opening and closing device comprising an inclined surface for reaching a fulcrum portion .

  According to a second aspect of the present invention, in the state where the keyboard cover is rotated in the opening direction around the support shaft located at the second fulcrum portion and inclined obliquely rearward at the rear end portion of the instrument body. The keyboard lid opening and closing device according to claim 1, further comprising a stopper portion with which a rear end portion of the keyboard lid comes into contact when standing.

According to a third aspect of the present invention, the lid guide portion has the support shaft in which the keyboard lid is positioned at the second fulcrum portion of the shaft guide portion from a state where the keyboard lid is inclined and tilted rearward. When the keyboard cover is pivoted to the center and closed, the keyboard cover is gradually pushed upward by turning the keyboard cover in a closing direction while guiding the inner surface of the rear side of the keyboard cover. 2. The keyboard lid opening and closing device according to claim 1 , further comprising a second corner portion for causing an inner surface on the rear side to face the inclined surface of the lid guide portion.

The invention according to claim 4 further includes a damper device for braking the opening / closing operation of the keyboard lid when the keyboard lid is opened / closed with respect to the instrument body. A keyboard lid opening and closing device according to any one of claims 3 to 4.

  According to this invention, when opening the keyboard lid from the closed state at a predetermined angle, the lid cover can rotate the keyboard lid around the support shaft located at the first fulcrum portion of the shaft guide portion, Further, when the keyboard cover is opened at a predetermined angle, the support shaft can be moved obliquely to the lower rear side along the shaft guide portion and brought into contact with the second fulcrum portion of the shaft guide portion. It can be erected in a state where it is tilted rearward by rotating in the direction of opening the keyboard lid around the support shaft located at the center.

For this reason, it is not necessary to divide the keyboard cover, the structure of the keyboard cover is simplified, and the keyboard cover can be opened and closed only by rotating the keyboard cover around the support axis of the keyboard cover. It is easy and there is no need to store the keyboard cover inside the instrument body, so the depth of the instrument body can be reduced, the instrument body can be made thinner, and there is no space in the instrument body. Since it is hardly affected by the keyboard cover, the entire instrument can be greatly reduced in size.

It is the perspective view which decomposed | disassembled and showed the principal part in Embodiment 1 of the keyboard musical instrument to which this invention is applied. FIG. 2 is an enlarged cross-sectional view showing a state where a keyboard lid is closed in the keyboard instrument of FIG. 1. FIG. 3 is an enlarged cross-sectional view showing a state where the front side of the keyboard lid is lifted in the keyboard instrument of FIG. 2. FIG. 4 is an enlarged cross-sectional view showing a state in which the keyboard lid of the keyboard musical instrument of FIG. 3 is further rotated around a support shaft located at a first fulcrum portion and opened at a predetermined angle. FIG. 5 is an enlarged cross-sectional view illustrating a state in which the keyboard lid is opened at a predetermined angle and moved together with the support shaft toward the lower rear side in the keyboard instrument of FIG. 4. FIG. 6 is an enlarged cross-sectional view showing a state in which the keyboard lid rotates in a direction of opening around a support shaft located at a second fulcrum portion in the keyboard instrument of FIG. 5. FIG. 7 is an enlarged cross-sectional view showing a state in which the keyboard lid is tilted rearward in the keyboard instrument of FIG. 6. FIG. 8 is an enlarged cross-sectional view showing a state in which the keyboard lid is gradually pushed upward diagonally forward by rotating the keyboard lid in the closing direction in the keyboard instrument of FIG. 7. It is the perspective view which decomposed | disassembled and showed the principal part in Embodiment 2 of the keyboard musical instrument to which this invention is applied. FIG. 10 is an enlarged view of a main part showing a damper device in the keyboard instrument of FIG. 9. FIG. 10 is an enlarged view showing an operation state of the damper device when the keyboard lid rotates about a support shaft located at the first fulcrum portion in the keyboard instrument of FIG. 9. FIG. 12 is an enlarged view showing an operation state of the damper device when the keyboard lid rotates around the support shaft located at the second fulcrum portion in the keyboard instrument of FIG. 11.

(Embodiment 1)
A first embodiment in which the present invention is applied to a keyboard instrument will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, the keyboard instrument includes a musical instrument body 1. The musical instrument main body 1 includes a pair of side plates 2 (only one is shown in FIGS. 1 and 2) located on both the left and right sides, and a bottom plate 3 provided on the upper side between the pair of side plates 2. The front plate 4 provided upright at the front end (right side in FIG. 2) of the bottom plate 3 and the back plate 5 provided upright at the rear end (left side in FIG. 2) of the bottom plate 3 It has.

Thereby, this musical instrument main body 1 has a configuration in which the upper part is opened. As shown in FIGS. 1 and 2, a keyboard portion 6 is provided inside the musical instrument body 1. The keyboard unit 6 includes a keyboard chassis 7 disposed on the bottom plate 3 of the musical instrument body, a plurality of keys 8 arranged on the keyboard chassis 7 so as to be rotatable in the vertical direction, and a press of the plurality of keys 8. A plurality of hammer members 9 for applying an action load to each key 8 according to a key operation, and a switch unit SW for outputting a switch signal according to each key pressing operation of the plurality of keys 8 are provided.

In this case, as shown in FIGS. 1 and 2, the plurality of keys 8 are composed of white keys and black keys, and a plurality of these keys are arranged in the order of the scale. As shown in FIG. 2, the plurality of hammer members 9 are rotatably attached to the keyboard chassis 7 in a state corresponding to the lower sides of the plurality of keys 8, respectively. Each of the hammer members 9 is configured to apply an action load to each key 8 by being rotated against the weight of each hammer member 9 when being pushed down.

Further, as shown in FIGS. 1 and 2, a keyboard lid 10 that covers the keyboard portion 6 and closes the upper portion of the instrument body 1 is provided at the upper part of the instrument body 1 so as to be freely opened and closed. That is, a pair of support shafts 11 are attached to both sides of the rear portion of the keyboard lid 10 via attachment members 12. The support shaft 11 protrudes laterally from both sides of the rear portion of the keyboard lid 10 and is an upper portion of each inner surface of the pair of side plates 2 located on both sides of the instrument body 1 (only one is shown in FIGS. 1 and 2). It is comprised so that each may correspond to the location located in.

As shown in FIG. 1 and FIG. 2, a shaft guide groove 13 that guides the support shaft 11 so that the support shaft 11 is movable is inserted into the upper part of the inner surface of the side plate 2. It is provided substantially linearly in a state inclined toward (lower left side in FIG. 2). The shaft guide groove 13 is provided with a first fulcrum part 14 and a second fulcrum part 15 for restricting the position of the support shaft 11 in a rotatable manner. The first fulcrum portion 14 is located at the upper end portion of the shaft guide groove 13 and can rotate the support shaft 11 when the keyboard cover 10 is opened at a predetermined angle θ (for example, around 50 °) shown in FIG. It is comprised so that position control may be carried out.

As shown in FIGS. 1 and 2, the second fulcrum portion 15 is located at the lower end of the shaft guide groove 13, and the keyboard cover 10 opens at a predetermined angle θ (for example, around 50 °) shown in FIG. As shown in FIGS. 6 and 7, the support shaft 11 comes into contact with the support shaft 11 when the shaft 11 moves obliquely to the lower rear side (inclined lower left in FIG. 5) along the shaft guide groove 13. Is held so that the keyboard cover 10 is tilted backward (inclined to the upper left in FIG. 7).

In this case, on the upper part of the instrument body 1, that is, on the rear upper part of the back plate 5, as shown in FIGS. 2 and 7, the keyboard lid 10 opens in a direction to open around the support shaft 11 located at the second fulcrum portion 15. There is provided a stopper portion 16 with which the rear end portion 10a of the keyboard portion 10 abuts when it is turned upright and tilted rearward. Further, as shown in FIGS. 1 and 2, the opening / closing operation of the keyboard lid 10 is regulated on both sides of the rear end upper part of the instrument body 1, that is, the rear end upper part (left upper part in FIG. 2). A pair of lid guide portions 17 for guiding are provided.

As shown in FIGS. 3 and 4, the lid guide portion 17 supports the support shaft 11 while guiding the inner surface (the lower surface in FIG. 3) on the rear side of the keyboard lid 10 when the keyboard lid 10 is opened from the closed state. 4 is rotated at the first fulcrum portion 14 of the shaft guide groove 13 and rotated in the direction of opening the keyboard lid 10 (counterclockwise in FIG. 3) about the position-supported support shaft 11 as shown in FIG. Thus, when the keyboard cover 10 is opened at a predetermined angle θ (for example, around 50 °), the support shaft 11 is moved obliquely to the lower rear side (in FIG. 5, obliquely lower left) along the shaft guide groove 13. 6, the support shaft 11 is configured to reach the second fulcrum portion 15 of the shaft guide groove 13.

Further, as shown in FIG. 8, the lid guide portion 17 is configured such that the keyboard lid 10 rises from the second position of the shaft guide groove 13 from the state where the keyboard lid 10 stands up obliquely rearward (inclined left upper side in FIG. 8). When rotating and closing around the support shaft 11 located at the fulcrum 15, the keyboard lid 10 is rotated and moved in the closing direction (clockwise in FIG. 8) while guiding the inner surface of the rear side of the keyboard lid 10. Thus, the inner surface of the rear side of the keyboard lid 10 that is gradually pushed upward obliquely is made to face the inclined surface 17c, and the support shaft 11 is changed from the second fulcrum portion 15 of the shaft guide groove 13 to the first fulcrum portion 14. It is comprised so that it can move toward.

That is, as shown in FIGS. 2 to 8, the lid guide portion 17 includes a horizontal portion 17 a with which the inner surface of the rear side of the keyboard lid 10 abuts in a substantially horizontal state, and a keyboard lid when the keyboard lid 10 is opened and closed. When opening and closing the keyboard lid 10, an upper corner portion 17 b for rotating while guiding the inner surface on the rear side of 10, an inclined surface 17 c for obliquely moving the keyboard lid 10 in the vertical direction, and A substantially arc-shaped lower corner portion 17d for rotating while guiding the inner surface of the rear side of the keyboard lid 10 is provided.

As shown in FIG. 2, when the keyboard cover 10 is in a closed state covering the keyboard part 2, the horizontal part 17a is applied so that the inner surface (the lower surface in FIG. 2) on the rear side of the keyboard cover 10 is substantially horizontal. In contact therewith, the rear side of the keyboard lid 10 is supported. In this case, as shown in FIG. 2, the keyboard lid 10 is arranged at the upper part of the musical instrument main body 1 by supporting the front side portion of the keyboard lid 10 by the front receiving portion 2 a provided on the inner surface of the side plate 2. It is comprised so that it may cover.

3 and 4, the upper corner portion 17b guides the support shaft 11 while guiding the inner surface of the rear side of the keyboard lid 10 when the keyboard lid 10 is opened from the closed state covering the keyboard portion 2. The position is restricted to the first fulcrum part 14 of the shaft guide groove 13, and the keyboard cover 10 is rotated around the position restricted support shaft 11 in the opening direction (counterclockwise in FIG. 4). . The upper corner portion 17b functions in a similar manner when the keyboard lid 10 is closed.

As shown in FIGS. 4 and 5, the inclined surface 17c is in a state in which the inner surface (the lower surface in FIG. 4) of the keyboard cover 10 is substantially parallel when the keyboard cover 10 is opened at a predetermined angle θ (for example, around 50 °). As a result, the keyboard cover 10 is moved toward the diagonally rear lower part (in the diagonally lower left side in FIG. 5) and the support shaft 11 is moved along the shaft guide groove 13 to the diagonally rear lower part. ing.

As shown in FIGS. 4 and 5, the inclined surface 17c has an inclination angle substantially equal to or slightly smaller than a predetermined opening angle of the keyboard cover 10 (for example, a predetermined angle θ around 50 °). Inclined. Thereby, when the support shaft 11 moves to the oblique lower rear side (obliquely lower left side in FIG. 4) along the shaft guide groove 13, the inclined surface 17 c hardly contacts the inner surface of the rear side of the keyboard lid 10. The keyboard cover 10 is formed so as to move to the lower rear side.

That is, as shown in FIG. 2, the inclined surface 17c has a distance L1 between the upper portion located on the upper corner 17b side and the first fulcrum portion 14 from a distance L between the support shaft 11 and the inner surface of the keyboard lid 10. Is slightly smaller (L1 <L) and is slightly smaller than the distance L2 between the lower portion located on the lower corner 17d side and the second fulcrum portion 15 (L1 <L2). Further, the distance L2 between the lower portion located on the lower corner portion 17d side and the second fulcrum portion 15 is substantially the same as or slightly smaller than the distance L between the support shaft 11 and the inner surface of the keyboard lid 10 (L2 ≦ L) is formed.

As a result, as shown in FIGS. 4 and 5, when the keyboard cover 10 is rotated about the support shaft 11 located at the first fulcrum portion 14 in a state of being opened at a predetermined angle θ, A distance L from the inner surface of the keyboard lid 10 is greater than a distance L1 between an upper portion located on the upper corner portion 17b and the first fulcrum portion 14 and a lower portion located on the lower corner portion 17d side and the second fulcrum portion 15 Is larger than the distance L1 between the upper portion located on the upper corner portion 17b side and the first fulcrum portion 14, so that the keyboard lid 10 hardly touches the inclined surface 17c toward the oblique lower rear portion. Is configured to move.

On the other hand, as shown in FIGS. 6 to 8, the lower corner portion 17 d rotates in the direction in which the keyboard lid 10 opens (counterclockwise in FIG. 7) around the support shaft 11 located at the second fulcrum portion 15. In this case, the keyboard lid 10 is rotated while guiding the inner surface (right side surface in FIG. 7) on the rear side of the keyboard portion 10, so that the inner surface on the rear side of the keyboard lid 10 contacts the stopper portion 16 of the instrument body 1. It is configured to contact.

Further, as shown in FIG. 8, the lower corner portion 17d has an inner surface on the rear side of the keyboard lid 10 abutting against the stopper portion 16 of the instrument body 1 so that the keyboard lid 10 is obliquely rearward (in FIG. When the keyboard lid 10 is rotated in the closing direction (clockwise in FIG. 8) about the support shaft 11 rotatably held by the second fulcrum portion 15 from the state where the keyboard lid 10 is tilted upright. The inner surface of the rear side of the keyboard lid 10 that is gradually pushed upward obliquely upward is made to face the inclined surface 17 c of the lid guide portion 17 while guiding the inner surface of the rear side of the lid 10.

As a result, as shown in FIG. 8, when the keyboard cover 10 is rotated in the closing direction (clockwise in FIG. 8) around the support shaft 11 located at the second fulcrum portion 15, the keyboard cover 10 is gradually inclined obliquely upward. When pushed up, the inner surface of the rear side of the keyboard lid 10 faces the inclined surface 17c of the lid guide portion 17 and is movable obliquely upward along the inclined surface 17c. It is comprised so that it can move to the 1st fulcrum part 14 from the 13 2nd fulcrum parts 15.

That is, as shown in FIG. 5, when the inner surface of the rear side of the keyboard lid 10 faces the inclined surface 17c of the lid guide portion 17, the keyboard lid 10 has an upper portion and a first fulcrum portion located on the upper corner portion 17b side. 14 is formed to be slightly smaller (L1 <L2) than the distance L2 between the lower portion positioned on the lower corner portion 17d side and the second fulcrum portion 15 (L1 <L2). When the support shaft 11 is rotated in the closing direction around the upper corner portion 17b of the lid guide portion 17, the support shaft 11 is moved into the second direction of the shaft guide groove 13 by turning in the closing direction around the portion 17b. The fulcrum part 15 is configured to move toward the first fulcrum part 14.

Next, the operation of the opening / closing device for the keyboard lid 10 in this keyboard instrument will be described.
When the keyboard lid 10 is opened from the closed state, the front side of the keyboard lid 10 is lifted as shown in FIG. At this time, as shown in FIGS. 3 and 4, the inner surface of the rear side of the keyboard lid 10 is guided by the upper corner portion 17 b of the lid guide portion 17, so that the support shaft 11 is the first fulcrum portion of the shaft guide groove 13. 14, and the keyboard lid 10 is rotated in the opening direction about the position-supported support shaft 11.

Then, as shown in FIG. 5, when the keyboard lid 10 is opened at a predetermined angle θ, for example, around 50 °, the inner surface of the rear side of the keyboard lid 10 is substantially parallel to the inclined surface 17c of the lid guide portion 17. The shaft 11 is movable along the shaft guide groove 13 toward the lower rear side. As a result, the keyboard cover 10 moves obliquely toward the lower rear side, and the support shaft 11 moves obliquely downward along the shaft guide groove 13. As shown in FIG. The two fulcrum portions 15 are reached and held rotatably.

In this state, as shown in FIG. 7, the keyboard lid 10 is rotated counterclockwise around the support shaft 11 and tilted toward the rear side of the instrument body 1. Then, the rear end portion 10a of the keyboard lid 10 comes into contact with the stopper portion 16 of the back plate 5, and the keyboard lid 10 stands up in a state where it tilts backward. As a result, the keyboard lid 10 is held up in a stable state, the upper portion of the instrument body 1 is opened, and the keyboard portion 2 is exposed, so that the keyboard portion 2 can be operated to perform well.

On the other hand, when the keyboard lid 10 is closed, as shown in FIG. 8, the keyboard lid 10 is rotated clockwise around the support shaft 11 held at the second fulcrum portion 15 of the shaft guide groove 13. Move. At this time, the inner surface of the rear side of the keyboard lid 10 rotates and moves toward the closing direction while being guided by the lower corner portion 17d of the lid guide portion 17, and the keyboard lid 10 is gradually pushed up.

When the keyboard lid 10 is tilted to a predetermined angle θ, for example, around 50 °, the inner surface on the rear side of the keyboard lid 10 faces the inclined surface 17 c of the lid guide portion 17. As a result, the inner surface of the rear side of the keyboard lid 10 is movable obliquely upward along the inclined surface 17c of the lid guide portion 17, and the support shaft 11 is moved along the shaft guide groove 13 to the second fulcrum. It will be in the state which can move diagonally upward toward the 1st fulcrum part 14 from the part 15. FIG.

Further, at this time, the inner surface of the rear side of the keyboard lid 10 faces the inclined surface 17c of the lid guide portion 17, so that the keyboard lid 10 rotates in the closing direction around the upper corner portion 17b of the lid guide portion 17. It becomes possible. For this reason, when the keyboard lid 10 is rotated about the upper corner portion 17b in the closing direction, the support shaft 11 is automatically moved along the shaft guide groove 13 while the keyboard lid 10 gradually moves forward. The fulcrum part 15 is moved obliquely upward toward the first fulcrum part 14.

Then, when the keyboard lid 10 is rotated in the closing direction and the support shaft 11 reaches the first fulcrum portion 14, the inner surface of the rear side of the keyboard lid 10 is the upper corner of the lid guide portion 17 as shown in FIG. 4. Since the support shaft 11 is regulated by the first fulcrum portion 14 because the guide shaft is guided by the portion 17b, the keyboard lid 10 can be rotated in the closing direction about the support shaft 11 regulated in position. . In this state, when the keyboard cover 10 is further rotated in the closing direction, as shown in FIG. 2, the keyboard cover 10 is arranged on the upper part of the instrument body 1 and covers the keyboard part 6. Block.

Thus, in this keyboard lid opening and closing device, the support shaft 11 is positioned at the first fulcrum portion 14 of the shaft guide groove 13 by the lid guide portion 17 when the keyboard lid 10 is opened from the closed state to the predetermined angle θ. The keyboard lid 10 can be rotated around the support shaft 11 that is restricted and restricted in position. Further, when the keyboard cover 10 is opened at a predetermined angle θ, the keyboard cover 10 can be moved toward the lower oblique lower side, and the support shaft 11 is moved along the shaft guide groove 13 toward the lower oblique lower side. It can be made to contact | abut to the 2nd fulcrum part 15 of the shaft guide groove | channel 13. In this state, by rotating the keyboard lid 10 around the support shaft 11 positioned at the second fulcrum portion 15 in the opening direction, the keyboard lid 10 can be stood up in a state of being inclined obliquely rearward.

For this reason, according to the opening / closing device for the keyboard lid 10, since it is not necessary to divide the keyboard lid 10 into a front lid and a rear lid, the structure of the keyboard lid 10 is simplified, and the support shaft 11 of the keyboard lid 10 is provided. Since the operation is only to rotate the keyboard cover 10 around the center, the opening / closing operation of the keyboard cover 10 can be easily performed, and it is not necessary to store the keyboard cover 10 in the instrument body 1. In addition to reducing the vertical thickness of the musical instrument body 1, the space inside the musical instrument body 1 is hardly affected by the keyboard lid 10, so that the entire instrument is greatly reduced in size. Can be

In this case, at the rear end of the instrument main body 1, that is, the rear upper portion of the back plate 5, the keyboard lid 10 stands up with the support shaft 11 positioned at the second fulcrum 15 around the support shaft 11 and inclined obliquely rearward. In this case, since the stopper portion 16 with which the rear end portion 10a of the keyboard portion 10 abuts is provided, the keyboard lid 10 rotates about the support shaft 11 located at the second fulcrum portion 15 and moves obliquely rearward. Even when standing in an inclined state, the keyboard cover 10 can be tilted rearward in a stable state by the stopper portion 16.

Further, the lid guide portion 17 includes an upper corner portion 17b for guiding the inner surface of the rear side of the keyboard lid 10 when the keyboard lid 10 is opened from a state where it covers the keyboard portion 2. The position of the support shaft 11 can be restricted to the first fulcrum part 14 of the shaft guide groove 13 by the portion 17b, and the keyboard cover 10 can be rotated in the opening direction around the support shaft 11 restricted in position. The keyboard cover 10 can be rotated smoothly and satisfactorily in a stable state in the opening direction.

Further, since the lid guide portion 17 includes an inclined surface 17c for moving the keyboard lid 10 obliquely downward when the keyboard lid 10 is opened at a predetermined angle, the keyboard lid 10 has a predetermined angle. When opened, the keyboard cover 10 can be moved obliquely downward along the inclined surface 17c, and the support shaft 11 is moved obliquely to the lower rear side along the shaft guide groove 13 to provide a shaft guide. The second fulcrum portion 15 of the groove 13 can be reached, and thereby the keyboard lid 10 can be opened smoothly and satisfactorily in a stable state.

Further, the lid guide portion 17 is configured such that the keyboard lid 10 rotates around the support shaft 11 positioned at the second fulcrum portion 15 of the shaft guide groove 13 from a state where the keyboard lid 10 is tilted and tilted rearward. Since the lower side corner portion 17d for guiding the keyboard lid 10 to face the inclined surface 17c of the lid guide portion 17 when closing is further provided, the support shaft 11 positioned at the second fulcrum portion 15 is mainly provided. When the keyboard lid 10 is rotated in the closing direction, the keyboard lid 10 is gradually pushed upward obliquely, and the inner surface of the rear side of the keyboard lid 10 faces the inclined surface 17 c of the lid guide portion 17. it can.

For this reason, in a state where the keyboard cover 10 is tilted rearward and tilted, the keyboard cover 10 is erroneously rotated in a closing direction around the support shaft 11 positioned at the second fulcrum portion 15 of the shaft guide groove 13. Even if the keyboard lid 10 is tilted toward the front side of the instrument body 1, the inner surface of the rear side of the keyboard lid 10 can be brought into contact with the inclined surface 17c of the lid guide portion 17, so that the keyboard lid 10 can be used without permission. It can prevent falling to the upper part of the main body 1, thereby providing a highly safe product.

When the inner surface of the rear side of the keyboard lid 10 faces the inclined surface 17c of the lid guide portion 17, the upper corner portion 17b positioned above the inclined surface 17c of the lid guide portion 17 closes the keyboard lid 10. Therefore, when the keyboard cover 10 is turned around the upper corner portion 17b in the closing direction, the support shaft 11 is automatically moved to the front side while the keyboard cover 10 is gradually moved forward. 13, the second fulcrum part 15 can be moved toward the first fulcrum part 14. Thereby, when closing the keyboard cover 10, the keyboard cover 10 can be closed smoothly and satisfactorily in a stable state.

(Embodiment 2)
Next, a second embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
As shown in FIG. 10, the opening / closing device for the keyboard lid 10 in this keyboard instrument is configured to include a damper device 20 for braking the opening / closing operation of the keyboard lid 10 when the keyboard lid 10 is opened / closed. The configuration is almost the same as in the first embodiment.

That is, as shown in FIGS. 9 and 10, the damper device 20 includes a damper member 21, a damper shaft 22 provided in the damper member 21 so as to be capable of braking, and a damper gear attached to the damper shaft 22. 23 and a driven gear 24 that is provided on the support shaft 11 of the keyboard lid 10 and meshes with the damper gear 23. The driven gear 24 and the support are supported by applying a load to the damper shaft 22 to brake the rotation of the damper gear 23. The rotation of the shaft 11 is braked to brake the opening / closing operation of the keyboard lid 10.

In this case, as shown in FIGS. 9 and 10, the damper member 21 is attached to a support arm portion 25 that is attached to the inner surface of the side plate 2 of the musical instrument main body 1 so as to be rotatable in the vertical direction by an attachment shaft 26. In this state, the damper gear 23 is configured to mesh with the driven gear 24 of the support shaft 11. The driven gear 24 is formed in a fan shape and is fixed to the support shaft 11 provided on the keyboard lid 10. Further, the damper shaft 22 and the support shaft 11 of the damper member 21 are connected by a connecting member 27 as shown in FIGS. 9 and 10.

Accordingly, as shown in FIGS. 11 and 12, when the driven gear 24 rotates in accordance with the opening / closing operation of the damper device 20 when the keyboard cover 10 is opened / closed, the damper gear 23 is braked by the rotation. When the support shaft 11 of the keyboard lid 10 moves obliquely downward along the shaft guide groove 13, the holding arm portion 25 is rotated up and down around the mounting shaft 26 by the connecting member 27. Thus, the damper gear 23 and the driven gear 24 are configured to always mesh and rotate.

Next, the operation of the opening / closing device for the keyboard lid 10 will be described.
When the front side of the keyboard lid 10 is lifted and opened from the state in which the keyboard lid 10 is closed, the first fulcrum portion 14 of the shaft guide groove 13 is guided while the keyboard lid 10 is guided by the lid guide portion 17 as shown in FIG. It rotates around the support shaft 11 located at the center. At this time, the driven gear 24 rotates together with the support shaft 11, the rotation is transmitted to the damper gear 23 of the damper member 21, and the damper shaft 22 of the damper gear 23 is braked, whereby the keyboard lid 10 is rotated. Is braked.

When the keyboard lid 10 is opened at a predetermined angle θ, for example, around 50 °, the inner surface of the rear side of the keyboard lid 10 is substantially parallel to the inclined surface 17c of the lid guide portion 17 as in the first embodiment. 10 moves toward the diagonally rear lower portion, and the support shaft 11 moves along the shaft guide groove 13 toward the diagonally rear lower portion. Thus, the support shaft 11 reaches the second fulcrum portion 15 of the shaft guide groove 13, and the support shaft 11 is rotatably held by the second fulcrum portion 15.

At this time, as shown in FIG. 12, the connecting member 27 moves the holding arm portion 25 downward while the damper gear 23 and the driven gear 24 are engaged with each other. In this state, the keyboard lid 10 is rotated counterclockwise around the support shaft 11 held by the second fulcrum portion 15 and tilted toward the rear side. Also at this time, the driven gear 24 rotates together with the support shaft 11, the rotation is transmitted to the damper gear 23 of the damper member 21, and the damper shaft 22 of the damper gear 23 is braked, whereby the rotation of the keyboard lid 10 is performed. The movement is braked.

Then, when the rear end portion 10a of the keyboard lid 10 abuts against the stopper portion 16 of the back plate 5, the keyboard lid 10 stands up in a state of being inclined rearward. As a result, the keyboard lid 10 is tilted and stands up in a stable state, and the upper portion of the musical instrument main body 1 is opened to expose the keyboard portion 2, so that the keyboard portion 2 can be operated as in the first embodiment. Can be performed.

When the keyboard lid 10 is closed, when the keyboard lid 10 is rotated clockwise around the support shaft 11 held by the second fulcrum portion 15 of the shaft guide groove 13, as shown in FIG. The inner surface of the rear side of the keyboard lid 10 is rotated and moved toward the closing direction guided by the lower corner portion 17d of the lid guide portion 17. Also at this time, the driven gear 24 rotates together with the support shaft 11, the rotation is transmitted to the damper gear 23 of the damper member 21, and the damper shaft 22 of the damper gear 23 is braked, whereby the rotation of the keyboard lid 10 is performed. The movement is braked.

Thereafter, when the keyboard lid 10 is tilted to a predetermined angle θ, for example, around 50 °, the inner surface of the rear side of the keyboard lid 10 faces the inclined surface 17c of the lid guide portion 17, so that the lid guide portion is the same as in the first embodiment. When the keyboard lid 10 is turned around the upper corner portion 17 b of the reference numeral 17, the support shaft 11 moves obliquely upward from the second fulcrum portion 15 toward the first fulcrum portion 14 along the shaft guide groove 13. Moving. At this time, in a state where the damper gear 23 and the driven gear 24 are engaged with each other, the connecting member 27 moves the holding arm portion 25 upward.

When the support shaft 11 reaches the first fulcrum portion 14, the keyboard lid 10 is rotated in the closing direction about the support shaft 11 located at the first fulcrum portion 14. Also at this time, the driven gear 24 rotates together with the support shaft 11, the rotation is transmitted to the damper gear 23 of the damper member 21, and the damper shaft 22 of the damper gear 23 is braked, whereby the rotation of the keyboard lid 10 is performed. The movement is braked. As a result, as shown in FIG. 2, the keyboard lid 10 is disposed on the upper portion of the musical instrument main body 1, so that the upper portion of the musical instrument main body 1 is closed with the keyboard lid 10 covering the keyboard portion 2.

As described above, according to the opening / closing device for the keyboard lid 10, in addition to the same effects as those of the first embodiment, the damper device 20 for braking the opening / closing operation of the keyboard lid 10 when opening / closing the keyboard lid 10. Therefore, when the keyboard lid 10 is opened and closed, the damper lid 20 can prevent the keyboard lid 10 from opening and closing suddenly, so that the keyboard lid 10 can be opened and closed more safely than in the first embodiment. Can do.

That is, the damper device 20 includes a damper member 21, a damper shaft 22 provided in the damper member 21 so as to be brakeable, a damper gear 23 attached to the damper shaft 22, and the support shaft 11 of the keyboard lid 10. Since the driven gear 24 is provided and meshed with the damper gear 23, the rotation of the driven gear 24 and the support shaft 11 is braked by applying a load to the damper shaft 22 to brake the rotation of the damper gear 23. This makes it possible to reliably and satisfactorily brake the turning operation of the keyboard lid 10.

In the second embodiment described above, the case has been described in which the damper device 20 is configured to brake the turning operation of the keyboard lid 10 both when the keyboard lid 10 is opened and closed. The damper device 20 may be configured to apply a load in only one direction to the damper shaft 22 of the damper member 21 so that the damper device 20 brakes the turning operation of the keyboard cover 10 when the keyboard cover 10 is closed. If comprised in this way, since the rotation operation of the keyboard cover 10 can be braked when the keyboard cover 10 is closed, the keyboard cover 10 can be safely closed when the keyboard cover 10 is closed, and the keyboard cover 10 can be operated with a light force. Can be opened easily, thereby providing a user-friendly one.

In the second embodiment described above, the case where the damper device 20 is configured to brake the rotation operation of the support shaft 11 of the keyboard lid 10 is described. However, the present invention is not limited to this. When the portion 25 rotates in the vertical direction, a damper member such as a spring member for braking the vertical rotation of the support arm portion 25 is provided, and the support shaft 11 of the keyboard lid 10 is provided with the shaft guide groove 13. When the keyboard cover 10 moves obliquely in the vertical direction, the moving operation may also be braked.

Furthermore, in the first and second embodiments described above, the shaft guide groove 13 for guiding the support shaft 11 of the keyboard lid 10 is linearly inclined toward the lower rear side, and accordingly, the inclined surface 17c of the lid guide portion 17 is provided. In addition, the case where the cover is formed in a plane is not limited to this, but the shaft guide groove is formed so as to be convex toward the rear side, and the inclined surface of the lid guide portion 17 is accordingly formed. 17c may also be formed on a curved surface that is convex toward the rear side. If comprised in this way, when the support shaft 11 of the keyboard cover 10 moves along an axis guide groove, the keyboard cover 10 can be moved smoothly and satisfactorily.

Furthermore, in the first and second embodiments described above, the case where the present invention is applied to a keyboard instrument including a plurality of hammer members 9 that apply action loads to the respective keys 8 during a key pressing operation has been described. It is not necessary to be a keyboard instrument and can be widely applied to simple keyboard instruments that do not use the hammer member 9.

DESCRIPTION OF SYMBOLS 1 Musical instrument main body 2 Side plate 3 Bottom plate 4 Front plate 5 Back plate 6 Keyboard part 10 Keyboard cover 10a Rear end part of keyboard cover 11 Support shaft 13 Axle guide groove 14 First fulcrum part 15 Second fulcrum part 16 Stopper part 17 Cover guide part 17a Horizontal portion 17b Upper corner portion 17c Inclined surface 17d Lower corner portion 20 Damper device 21 Damper member 22 Damper shaft 23 Damper gear 24 Drive gear 25 Support arm portion 27 Connecting member

Claims (4)

In a keyboard lid opening and closing device that covers the keyboard provided inside the instrument body so as to be freely opened and closed,
A support shaft provided at a rear end portion of the keyboard lid and projecting toward a side surface in the instrument body; and a support shaft provided in a state inclined toward a rear lower side at a rear side portion in the instrument body. A shaft guide part for guiding the movement of the keyboard, and a lid guide part provided at the upper rear end of the instrument body for guiding the opening / closing operation of the keyboard lid,
The shaft guide portion is positioned at an upper end portion thereof, and when the keyboard cover is opened at a predetermined angle from a closed state, a first fulcrum portion for restricting the position of the support shaft so as to be rotatable, and a lower end of the shaft guide portion The keyboard cover is opened at the predetermined angle and the support shaft is moved obliquely to the lower rear side along the shaft guide portion to contact and hold the support shaft rotatably. A second fulcrum for tilting and tilting the keyboard lid obliquely backward in a state ;
The lid guide portion is positioned at the first fulcrum portion of the shaft guide portion while guiding the inner surface of the rear side of the keyboard lid when opening the keyboard lid from the closed state at the predetermined angle. A first restricting portion for regulating and rotating the keyboard lid in a direction to open the keyboard lid around the support shaft, the position of which is regulated; and when the keyboard lid is opened at the predetermined angle, An opening / closing device for a keyboard lid, comprising: an inclined surface that is moved obliquely downward along the shaft guide portion to reach the second fulcrum portion of the shaft guide portion .   At the rear end of the instrument main body, the keyboard cover is turned upright when the keyboard cover is rotated in the opening direction around the support shaft located at the second fulcrum and tilted obliquely backward. The keyboard lid opening and closing device according to claim 1, further comprising a stopper portion with which a rear end portion abuts. The lid guide portion is closed when the keyboard lid pivots around the support shaft located at the second fulcrum portion of the shaft guide portion from a state where the keyboard lid is inclined and tilted rearward. The lid cover guides the inner surface of the rear side of the keyboard lid, which is gradually pushed upward by turning the keyboard lid in a closing direction while guiding the inner surface of the rear side of the keyboard lid. The keyboard lid opening and closing device according to claim 1 , further comprising a second corner portion for facing the inclined surface of the portion. When opening and closing the fallboard with respect to the instrument main body, according to any one of claims 1 to 3, wherein the further comprising a damper device for braking the opening and closing operation of the fallboard Keyboard lid opening and closing device.

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