JP5561651B2 - Keyboard instrument lid opening and closing device - Google Patents

Description

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

  Conventionally, as a lid opening / closing device for a keyboard instrument such as an electronic piano, as described in Patent Document 1, a keyboard lid that can be opened and closed is slidable on an instrument case provided with a keyboard portion inside. The structure provided in is known.

Japanese Patent Laid-Open No. 08-272354

  This type of lid opening / closing device divides the keyboard lid into a front lid and a rear lid, connects the front lid and the rear lid so as to be relatively movable by a shaft, and guides the front portion of the front lid with a front guide portion. In addition, the rear lid is configured to be guided by the rear guide portion. In this case, the shaft connecting the front lid and the rear lid is provided at the rear end of the front lid. The rear lid is configured to move relative to the lower side of the front lid in a state in which the rear lid is movably connected to the front lid by a shaft.

  Further, the shaft has a first pinion gear that meshes with a first rack gear that is a rear guide portion provided from the middle to the rear portion in the instrument case and rolls, and a rear lid that extends from the front portion to the rear portion. There is provided a second pinion gear that meshes with a second rack gear provided over the wheel and rolls. In this case, the 2nd pinion gear is formed in the pitch circle diameter ratio of 1/2 of the 1st pinion gear. For this reason, when the front lid moves, the second pinion gear is configured to follow the rear lid with a movement amount ½ of the front lid.

  In such a lid opening / closing device, when the keyboard lid is opened from the closed state, if the front portion of the front lid is lifted and moved rearward, the front lid is guided while being guided by the front guide portion. Moves rearward, and the shaft moves rearward as the front lid moves. At this time, the first pinion gear meshes with the first rack gear of the instrument case and rolls, and the second pinion gear meshes with the second rack gear of the rear cover and rolls. For this reason, the rear lid follows the front lid with a movement amount of 1/2 of the front lid. As a result, the keyboard lid is housed in a musical instrument case behind the keyboard portion and with the rear lid overlapping the lower side of the front lid.

  However, in such a conventional keyboard instrument lid opening and closing device, when the keyboard lid is opened and closed, the shaft moves in the instrument case as the front lid moves, so that the range of movement of the shaft in the instrument case is dead. There is a problem that it becomes a space and other components such as a speaker cannot be sufficiently mounted.

  The problem to be solved by the present invention is to provide a lid opening / closing device for a keyboard instrument that can increase the mounting density by widely using the space in the instrument case.

In order to solve the above problems, the present invention includes the following components.
According to the first aspect of the present invention, there is provided a musical instrument case in which a keyboard part is provided, a keyboard cover comprising a plurality of lid parts slidably provided on the musical instrument case and covering the keyboard part so as to be openable and closable. A plurality of rack gears extending from respective rear portions of the plurality of lid portions of the keyboard lid toward the rear portion in the instrument case and being flexibly moved in accordance with opening / closing operations of the plurality of lid portions; A plurality of pinion gears that are rotatably provided at the rear portion of the case and that rotate in mesh with the plurality of rack gears, respectively, and guide the plurality of rack gears according to the opening and closing operations of the plurality of lid portions, respectively. And a lid opening / closing device for a keyboard instrument , comprising a plurality of gear guide portions that are respectively pressed and meshed with the plurality of pinion gears .

  According to a second aspect of the present invention, the plurality of lids are respectively provided in the musical instrument case to guide the plurality of lids according to an opening / closing operation, and when the keyboard lid is closed, the plurality of lids are moved to the keyboard unit. And a plurality of lid guides for storing the plurality of lids in a musical instrument case so as to overlap each other when the keyboard lid is opened. Item 2. A lid opening / closing device for a keyboard instrument according to Item 1.

The invention according to claim 3, wherein the plurality of pinion gears, according to claim 1 or 2, characterized in that the respective diameters are different from each according to the movement distance of the plurality of lid This is a lid opening / closing device for a keyboard instrument.

According to a fourth aspect of the present invention, in the keyboard instrument lid opening and closing device according to any one of the first to third aspects, the plurality of pinion gears are integrally rotated together. is there.

  According to the present invention, when the plurality of lid portions are slid to open and close the keyboard lid, the plurality of rack gears bend and move while meshing with the plurality of pinion gears as the plurality of lid portions slide. Therefore, the plurality of pinion gears do not move in the instrument case, the plurality of rack gears mesh with the plurality of pinion gears, and can move the plurality of lids smoothly and satisfactorily.

  Therefore, even if a plurality of pinion gears and a shaft that rotatably supports the plurality of pinion gears are provided in the instrument case, the plurality of pinion gears and shafts do not move in the instrument case. Since it can be widely used and other components such as a speaker can be incorporated, the instrument case can be effectively used to increase the mounting density in the instrument case.

It is sectional drawing which showed the state which closed the keyboard cover in one Embodiment of the keyboard musical instrument to which this invention is applied. It is sectional drawing which showed the state in the middle of opening a keyboard cover in the keyboard musical instrument of FIG. FIG. 2 is a cross-sectional view showing a state in which the keyboard lid of the keyboard instrument of FIG. 1 is opened and stored in a musical instrument case. FIG. 2 is a plan view showing a keyboard lid, first and second rack gears, and first and second pinion gears in the keyboard instrument of FIG. 1. 4A and 4B show cross sections of the front lid and the rear lid of the keyboard lid of FIG. 4, wherein FIG. 4A is a cross-sectional view showing the front lid and the first rack gear in the direction of arrows AA in FIG. It is sectional drawing which showed the rear cover and 2nd rack gear in the BB arrow of 4. FIG. 2 shows cross sections of a front lid guide portion and a rear lid guide portion in the keyboard instrument of FIG. 2, and (a) is an enlarged cross-sectional view showing a main part of the front lid guide portion as viewed in the direction of arrows CC in FIG. (B) is the expanded sectional view which showed the principal part of the rear side cover guide part in the DD arrow view of FIG. It is the expanded sectional view which showed each 1st, 2nd pinion gear in the EE arrow view of FIG. FIG. 1 shows the meshed state of the first and second pinion gears and the first and second rack gears of the keyboard instrument of FIG. 1, and (a) shows the meshed state of the first pinion gear and the first rack gear. FIG. 3B is an enlarged cross-sectional view of the main part shown, and FIG. 4B is an enlarged cross-sectional view of the main part showing the meshing state of the second pinion gear and the second rack gear.

Hereinafter, an embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the keyboard instrument includes a musical instrument case 1 formed in a substantially box shape. The instrument case 1 includes a bottom plate 2. A front plate 3 is provided upright at a front end portion (left end portion in FIG. 1) of the bottom plate 2, and a rear plate 4 is provided at the front end portion (right end portion in FIG. 1) of the bottom plate 2. It stands up higher than the plate 3.

  Further, as shown in FIGS. 1 to 3, a pair of side plates 5 are provided upright at both ends of the bottom plate 2 (ends on the front and back sides of the paper surface in FIG. 1). The pair of side plates 5 has a rear portion positioned rearward of the intermediate portion in the front-rear direction (left-right direction in FIG. 1) at the same height as the rear plate 4, and a front portion positioned in front of the intermediate portion. Is inclined toward the front side, and the inclined front end portion is formed at substantially the same height as the front plate 3. A top plate 6 is provided on the rear portion of the pair of side plates 5 and on each upper portion of the rear plate 4. Thus, the musical instrument case 1 is formed in a substantially box shape with the front side of the top plate 6 opened upward.

  In the musical instrument case 1, a keyboard portion 7 is provided as shown in FIGS. The keyboard unit 7 includes a keyboard chassis 8 arranged on the front side (left side in FIG. 1) of the bottom plate 2 in the musical instrument case 1 and a plurality of keys 9 arranged on the keyboard chassis 8. In this case, the plurality of keys 9 are composed of a plurality of white keys and a plurality of black keys, which are mounted on the keyboard chassis 8 so as to be rotatable in the vertical direction.

  Further, as shown in FIGS. 1 to 3, the musical instrument case 1 is provided with a slidable keyboard lid 10 that covers the upper portion of the keyboard portion 7 so as to be opened and closed. As shown in FIG. 1, the keyboard lid 10 includes a front lid 11 that covers the front side (left side in FIG. 1) of the keyboard portion 7 and a rear lid 12 that covers the rear side (right side in FIG. 1) of the keyboard portion 7. And. As shown in FIGS. 1 to 3, the lid opening / closing device 13 of the keyboard lid 10 includes a front lid guide portion 14 that guides the front lid 11 and a rear lid guide portion 15 that guides the rear lid 12. Yes.

  As shown in FIGS. 1 to 3, the front lid guide portion 14 includes a handle portion 16 provided at the front end portion of the front lid 11, and a pair of front support pins 17 provided on both sides of the handle portion 16, A pair of U-shaped front guide rails 18 (see FIG. 8A) provided on the inner surfaces of the pair of side plates 5 of the musical instrument case 1 to guide the pair of front support pins 17 respectively.

  In this case, as shown in FIGS. 1 to 3, the pair of front guide rails 18 are gently curved in an arc shape obliquely upward from the front end portion of the keyboard portion 7 to be above the rear portion of the keyboard portion 7, that is, the ceiling. It is provided over a portion located below the front end portion of the plate 6 and is configured to be shared with a part of a first gear guide portion 27 described later.

  Thereby, when the front cover 11 is closed, the pair of front support pins 17 are positioned at the front end portions of the pair of front guide rails 18 when the keyboard cover 10 is closed, so that the front cover 11 When the keyboard cover 10 is opened, the pair of front support pins 17 moves rearward (to the right in FIG. 2) along the pair of front guide rails 18 as shown in FIG. When the lid 10 is opened, as shown in FIG. 3, the pair of front support pins 17 are located at the rear part (substantially the middle part in FIG. 3) of the pair of front guide rails 18 and are located above the rear part of the keyboard part 7. It is configured to move and be stored under the top plate 6 in the instrument body 1.

  As shown in FIGS. 1 to 3, the rear lid guide portion 15 includes a pair of rear support pins 20 provided on both sides of the rear end portion of the rear lid 12 and each of the pair of side plates 5 of the musical instrument case 1. A pair of rear guide rails 21 (see FIG. 8B) having a U-shaped cross-section provided on the inner surface and respectively guiding the pair of rear support pins 20 are provided. As shown in FIG. 1, the pair of rear guide rails 21 are respectively provided on the inner surfaces of the pair of side plates 5 positioned above the rear portion of the front guide rail 18 in the rear portion of the keyboard portion 7.

  That is, as shown in FIGS. 1 to 3, the pair of rear guide rails 21 is provided so as to be gently inclined from the upper rear part of the keyboard part 7 toward the upper oblique side and over the rear part in the musical instrument case 1. ing. In this case, a rear inclined portion 12 a is provided downward at the lower front end of the rear lid 12, and a front inclined portion 11 a corresponding to the inclined portion 12 a of the rear lid 12 is provided at the upper rear end of the front lid 11. Is provided upwards.

  As a result, when the keyboard lid 10 is closed, the rear lid 12 has the rear support pins 20 positioned at the front end portions of the pair of rear guide rails 21 as shown in FIG. With the inclined portion 12a positioned on the front inclined portion 11a of the front lid 11, the rear portion of the front lid 11 is continuously arranged at the same inclination angle as that of the front lid 11 and is arranged above the rear side of the keyboard portion 7. Has been.

  Further, when the rear cover 12 opens the keyboard cover 10, as shown in FIG. 2, when the rear support pins 20 move rearward along the pair of rear guide rails 21 (right side in FIG. 2), The rear inclined portion 12 a of the rear lid 12 is configured to move relatively on the front inclined portion 11 a of the front lid 11, ride on the front lid 11, and move on the front lid 11.

  Further, the rear cover 12 is located above the front cover 11 when the keyboard cover 10 is opened, and the rear support pins 20 are disposed behind the pair of rear guide rails 21 as shown in FIG. The top plate in the musical instrument case 1 is located at the end, and the rear inclined portion 12a of the rear lid 12 is positioned on the handle portion 16 of the front lid 11 so as to overlap the upper side of the front lid 11. 6 is configured to be housed below.

  Further, the lid opening / closing device 13 of the keyboard lid 10 is provided at the rear portion of the front lid 11 and extends so as to be bent toward the rear portion in the musical instrument case 1 as shown in FIGS. A first rack gear 22 that moves together with the front lid 11 and a second rack gear that moves along with the rear lid 12 in a state of being provided at the rear portion of the rear lid 12 and extending flexibly toward the rear portion in the musical instrument case 1. Rack gear 23.

  Each of the first and second rack gears 22 and 23 is made of a synthetic resin such as polyamide resin (PA), and as shown in FIGS. 1 to 5, the entire rack gear 22 and 23 is formed in a band shape and bends freely at an arbitrary position. Is configured to do. In this case, as shown in FIG. 4, the first rack gear 22 is attached with one end portion (left end portion in FIG. 4) protruding laterally on both sides of the rear end portion of the front lid 11. It extends long toward the rear part in the case 1.

  As shown in FIG. 4, the second rack gear 23 has one end portion (the left end portion in FIG. 4) attached to the lower portions on both sides of the rear end portion of the rear lid 12 and directed toward the rear portion in the instrument case 1. It is extended for a long time. As a result, as shown in FIG. 4, the first and second rack gears 22 and 23 are separated from the outer side of the second rack gear 23 (in the vertical direction in FIG. 4). They are arranged so as not to overlap each other.

  Further, as shown in FIGS. 1 to 4, the lid opening / closing device 13 of the keyboard lid 10 includes a shaft 24 provided at the rear part in the musical instrument case 1, and a shaft 24 provided rotatably on the shaft 24. The first and second pinion gears 25 and 26 with which the respective second rack gears 22 and 23 are engaged, and the first and second guides that regulate the respective deformation deformations of the first and second rack gears 22 and 23, respectively. 2 gear guide portions 27 and 28.

  As shown in FIGS. 1 to 4, the shaft 24 is bridged between a pair of side plates 5 at a position located at the upper rear side in the musical instrument case 1. As shown in FIGS. 4 and 7, the first and second pinion gears 25 and 26 are rotatably attached to both sides of the shaft 24 via bearings 29, respectively. Each of the first and second pinion gears 25 and 26 is made of synthetic resin such as polyacetal resin (POM), and meshing teeth 25a and 26a are formed on the outer periphery thereof.

  Further, as shown in FIGS. 5 and 8, the first and second rack gears 22 and 23 are respectively connected to the meshing teeth 25a and 26a of the first and second pinion gears 25 and 26 on the lower surfaces thereof. The meshing teeth 22a and 23a that mesh with each other are formed continuously. As a result, the first and second rack gears 22 and 23 are engaged with the meshing teeth 25a and 26a of the first and second pinion gears 25 and 26, respectively. The front lid 11 and the rear lid 12 are configured to move in accordance with each sliding operation.

  In this case, of the first and second pinion gears 25 and 26, the first pinion gear 25 is formed such that its diameter R1 is larger than the diameter R2 of the second pinion gear 26, as shown in FIG. Has been. That is, when the first rack gear 22 attached to the front lid 11 is meshed and rotated, the first pinion gear 25 has a moving distance of the front lid 11 longer than a moving distance of the rear lid 12 (about twice). Therefore, the diameter R1 is formed to be about twice as large as the diameter R2 of the second pinion gear 26 so that the outer periphery becomes longer according to the length of the movement distance.

  Similarly, when the second rack gear 23 attached to the rear lid 12 is engaged with the second pinion gear 26 and rotates, the movement distance of the rear lid 12 is shorter than the movement distance of the front lid 11 (about half). Therefore, the diameter R2 is smaller than the diameter R1 of the first pinion gear 25 so that the outer periphery is shorter than the outer periphery of the first pinion gear 25 in accordance with the length of the movement distance. It is about 2 small.

  On the other hand, as shown in FIGS. 6 and 8, each of the first and second gear guide portions 27 and 28 has a U-shaped cross-section guide that guides the first rack gear 22 that can be bent so as to be movable. The rail is configured to press the first and second rack gears 22 and 23 against the first and second pinion gears 25 and 26, respectively.

  That is, as shown in FIGS. 1 to 3, the first gear guide portion 27 has a common portion from the substantially middle portion of the front guide rail 18 of the front lid guide portion 14 to the rear portion in the musical instrument case 1. The extended rear portion extends downward along the rear plate 4 of the instrument case 1 via the first pinion gear 25, and the extended lower portion extends along the bottom plate 2 of the keyboard chassis 8 of the keyboard portion 7. It is the structure provided in the rear lower part continuously.

  In this case, as shown in FIGS. 1 to 3, the first gear guide portion 27 has a common portion in the front guide rail 18 of the front lid guide portion 14 extending from the middle portion to the rear portion. Further, as shown in FIGS. 6A and 8A, the first gear guide portion 27 is provided with an opening 27a at a location corresponding to the first pinion gear 25, and the opening 27a. The first rack gear 22 is pressed toward the outer peripheral surface of the first pinion gear 25 in a state where the meshing teeth 22a of the first rack gear 22 are engaged with the meshing teeth 25a of the first pinion gear 25. Has been.

  Further, as shown in FIGS. 1 to 3, the second gear guide portion 28 is positioned below the rear guide rail 21 of the rear lid guide portion 15 along the rear guide rail 21. The instrument case 1 extends obliquely upward and rearwardly over the rear upper side of the instrument case 1, and this extended rear part is continuously provided along the rear plate 4 of the instrument case 1 and under the second pinion gear 26. It has a configuration.

  As shown in FIGS. 6 (b) and 8 (b), the second gear guide portion 28 is also provided with an opening 28a at a location corresponding to the second pinion gear 26, and the second gear guide portion 28 passes through the opening 28a. The second rack gear 23 is pressed against the outer peripheral surface of the second pinion gear 26 in a state where the meshing teeth 23 a of the second rack gear 23 are engaged with the meshing teeth 26 a of the second pinion gear 26. Yes.

Next, the operation of the lid opening / closing device 13 for the keyboard instrument will be described.
First, when the keyboard lid 10 is closed, as shown in FIG. 1, the front support pin 17 of the front lid 11 is positioned at the front end portion of the front guide rail 18 and the rear cover pin 17 is provided at the rear portion of the front lid 11. With the front end of one rack gear 22 positioned on the front side of the first gear guide portion 27 common to the front guide rail 18, that is, substantially in the middle of the front guide rail 18, the front lid 11 of the keyboard portion 7 It is arranged above the front part.

  At this time, the rear support pin 20 of the rear lid 12 is positioned at the front end of the rear guide rail 21, and the rear inclined portion 12 a positioned at the front end of the rear lid 12 is the front inclined portion of the front lid 11. The rear lid 12 is disposed above the rear portion of the keyboard portion 7 continuously at the same inclination angle at the rear portion of the front lid 11 in a state where the rear lid 12 is placed correspondingly on the front portion 11a. Thereby, the keyboard part 7 is covered with the front cover 11 and the rear cover 12, as shown in FIG.

  In this state, when opening the keyboard lid 10, as shown in FIG. 1, the front lid 11 is directed rearward (right side in FIG. 1) while lifting the handle 16 provided at the front end of the front lid 11. The pair of front support pins 17 provided on both sides of the handle portion 16 move rearward along the pair of front guide rails 18 and are provided on both sides of the rear end portion of the rear lid 12. The pair of rear support pins 24 thus moved move rearward along the pair of rear guide rails 21.

  At this time, as shown in FIGS. 1 and 2, the pair of first rack gears 22 provided on both sides of the rear end portion of the front lid 11 is common with the front guide rail 18 as the front lid 11 moves. The pair of second rack gears 23 provided on both sides of the rear end portion of the rear cover 12 are moved while being guided by the first gear guide portion 27 and the rear cover 12 is moved. Accordingly, the instrument case 1 moves toward the rear while being guided by the second gear guide portion 28.

  In this case, as shown in FIG. 8A, the first rack gear 22 has its meshing teeth 22a meshed with the meshing teeth 25a of the first pinion gear 25 provided on the shaft 24. As shown, the first rack gear 25 moves along the first gear guide portion 27 while rotating the first pinion gear 25 as the front lid 11 moves.

  Further, as shown in FIG. 8B, the second rack gear 23 is shown in FIG. 2 because its meshing teeth 23a mesh with the meshing teeth 26a of the second pinion gear 26 provided on the shaft 24. As described above, the second rack gear 23 moves along the second gear guide portion 28 while rotating the second pinion gear 26 as the rear lid 12 moves.

  At this time, the first and second rack gears 22 and 23 are movable by the first and second gear guide portions 27 and 28 as shown in FIGS. 6 (a) and 6 (b). Therefore, even if the first and second rack gears 22 and 23 are formed to be bendable, the first and second rack gears 22 and 23 are not bent, and the first and second rack gears 22 and 23 are not bent. The pinion gears 25 and 26 are moved toward the rear of the musical instrument case 1 while rotating.

  At this time, as shown in FIGS. 8A and 8B, the first and second gear guide portions 27 corresponding to the first and second pinion gears 25 and 26, respectively. The meshing teeth 22a and 23a of the first and second rack gears 22 and 23 are connected to the meshing teeth 25a and 26a of the first and second pinion gears 25 and 26 through the openings 27a and 28a provided in the shaft 28, respectively. In a meshed state, the first and second rack gears 22 and 23 are pressed toward the meshing teeth 25a and 26a of the first and second pinion gears 25 and 26, respectively.

  Therefore, when the front lid 11 and the rear lid 12 are moved, and the first and second rack gears 22 and 23 are moved along the first and second gear guide portions 27 and 28, respectively, As the first and second rack gears 22 and 23 move, the first and second pinion gears 25 and 26 rotate. In this case, since each of the first and second pinion gears 25 and 26 is integrally rotated, when one of the first and second pinion gears 25 and 26 is rotated, the other is simultaneously rotated. Rotate.

  At this time, of the first and second pinion gears 25 and 26, the diameter R1 of the first pinion gear 25 is formed to be about twice as large as the diameter R2 of the second pinion gear 26. Therefore, the first and second pinion gears 25 and 26 rotate integrally so that the first and second pinion gears 25 and 26 have the same rotational speed even if the rotation speeds of the first and second pinion gears 25 and 26 are the same. The moving distance of the first rack gear 22 that moves while meshing with the second gear 25 is approximately twice the moving distance of the second rack gear 23 that moves while meshing with the second pinion gear 26.

  Thereby, when the front lid 11 and the rear lid 12 move toward the rear side of the musical instrument case 1 in the state shown in FIG. 1, the diameter R1 of the first pinion gear 25 is the same as that of the second pinion gear 26. Since it is larger than the diameter R2, the moving speed of the front lid 11 is faster than the moving speed of the rear lid 12. For this reason, when the front lid 11 moves rearward, as shown in FIG. 2, the front end portion of the rear lid 12 moves rearward while riding on the upper surface of the front lid 11.

  When the front lid 11 and the rear lid 12 further move toward the rear side of the musical instrument case 1, as shown in FIG. 3, the front support pin 17 at the front end of the front lid 11 has the front guide rail 18. While moving to the rear part, the rear part of the front lid 11 is moved to the rear upper part of the first gear guide part 27 that guides the first rack gear 22, and the top plate 6 located above the rear part of the keyboard part 7 is moved. It is stored in the instrument case 1 on the lower side.

  At this time, as shown in FIG. 3, the rear cover 12 moves the rear support pin 20 to the rear end of the rear guide rail 21, and the front end of the rear cover 12 moves on the upper surface of the front cover 11. It is located on the handle 16 of the front lid 11 and is stored in the instrument case 1 on the lower side of the top plate 6 located on the rear upper side of the keyboard 7 in a state of being superimposed on the front lid 11.

  That is, the diameter R1 of the first pinion gear 25 is about twice as large as the diameter R2 of the second pinion gear 26, and the moving speed of the front lid 11 is about twice as fast as the moving speed of the rear lid 12. Even if the movement distance of the lid 11 is about twice as long as the movement distance of the rear lid 12, the front lid 11 and the rear lid 12 can be accommodated in the instrument case 1 below the top plate 6 at substantially the same timing. The keyboard part 7 can be exposed satisfactorily. When the keyboard cover 13 is closed, the operation opposite to the above-described operation is performed.

  As described above, according to the lid opening / closing device 13 for the keyboard instrument, the front lid 11 and the rear lid 12 constituting the keyboard lid 10 are respectively extended from the rear portions toward the rear portion in the musical instrument case 1, The first and second rack gears 22 and 23 that move flexibly in accordance with the opening / closing operation of the first and second rack gears 22 and 23, and the first and second rack gears 22 and 23 that are rotatably provided at the rear part in the instrument case 1, respectively. 23, the first and second pinion gears 25 and 26 that mesh with each other and rotate. Therefore, the first and second pinion gears 25 and 26 and the first and second pinion gears Even if the shaft 24 that rotatably supports the gears 25 and 26 is provided in the instrument case 1, the first and second pinion gears 25 and 26 and the shaft 24 move in conjunction with the sliding operation of the keyboard lid 10. Never , It is possible to widely use the space in the musical instrument case 1.

  That is, in the lid opening / closing device 13 of the keyboard instrument, when the front lid 11 and the rear lid 12 are slid to open and close, the first and second slides of the front lid 11 and the rear lid 12 are accompanied by the sliding operations. Since the rack gears 22 and 23 are engaged with the first and second pinion gears 25 and 26 and moved while rotating the first and second pinion gears 25 and 26, the first and second pinion gears are moved. The gears 25 and 26 do not move in the instrument case 1 and the first and second pinion gears 25 and 26 are engaged with the first and second rack gears 22 and 23 and rotated at predetermined positions. The keyboard lid 10 can be opened and closed smoothly and satisfactorily.

  Therefore, the single shaft 24 that supports the first and second pinion gears 25 and 26 does not move in the musical instrument case 1 in accordance with the sliding movements of the front lid 11 and the rear lid 12. The space in the instrument case 1 can be widely used. As a result, other components such as a speaker (not shown) can be satisfactorily incorporated in the musical instrument case 1, so that the packaging density in the musical instrument case 1 can be increased by effectively utilizing the musical instrument case 1. .

  Further, according to the lid opening / closing device 13 for the keyboard instrument, the front lid 11 and the rear lid 12 are respectively provided in the musical instrument case 1 according to the opening / closing operation, and when the keyboard lid 10 is closed, the front lid 11 and the rear lid 12 are respectively guided. The lid 11 and the rear lid 12 are arranged in a plane above the keyboard portion 7, and when the keyboard lid 10 is opened, the front lid 11 and the rear lid 12 are accommodated in the instrument case 1 so as to overlap each other. By providing the front lid guide portion 14 and the rear lid guide portion 15 for the purpose, the front lid 11 and the rear lid 12 are reliably and satisfactorily guided when the keyboard lid 10 is opened and closed. 7 can be satisfactorily covered and the instrument case 1 can be made compact.

  Further, according to the lid opening / closing device 13 of the keyboard instrument, the first and second rack gears 22 and 23 are guided according to the opening / closing operation of the front lid 11 and the rear lid 12, respectively, and the first and second rack gears 22 and 23 are guided. The first and second rack gears 22 and 23 are configured to be bendable by providing the first and second gear guide portions 27 and 28 that are pressed and meshed with the pinion gears 25 and 26, respectively. The first and second rack gears 22 and 23 do not bend, and the first and second rack gears 22 and 23 can be guided and moved reliably and well, respectively. The first and second pinion gears 25 and 26 can be reliably engaged with each other.

  In this case, the first and second pinion gears 25 and 26 have different diameters R1 and R2 depending on the movement distances of the front lid 11 and the rear lid 12, respectively. 2 is rotated at the same rotational speed, the moving speed of the front lid 11 and the rear lid 12 can be changed. Therefore, the moving distances of the front lid 11 and the rear lid 12 are different. Even in this case, the front lid 11 and the rear lid 12 can be arranged in a plane above the keyboard portion 7 at the same timing, and can be stored in the instrument case 1.

  That is, since the movement distance of the front lid 11 is about twice the movement distance of the rear lid 12, the first pinion gear 25 has a diameter R 1 that is twice the diameter R 2 of the second pinion gear 26. Since the first and second pinion gears 25 and 26 have the same rotational speed, the moving distance of the first rack gear 22 that moves while meshing with the first pinion gear 25 is formed. Can be approximately double the moving distance of the second rack gear 23 that moves while meshing with the second pinion gear 26.

  Thereby, when the front lid 11 and the rear lid 12 slide, the movement speed of the front lid 11 is made faster than the movement speed of the rear lid 12, and the movement distance of the front lid 11 is made the movement distance of the rear lid 12. Can be longer. As a result, when the front lid 11 and the rear lid 12 are closed, they can be arranged in a plane above the keyboard portion 7 at the same timing, and when the front lid 11 and the rear lid 12 are opened, It can be satisfactorily stored in the musical instrument case 1 with the front lid 11 and the rear lid 12 overlapped at the same timing.

  In this case, the first and second pinion gears 25 and 26 are all integrally rotated together to move the front lid 11 and the first rack gear 22 is moved. When the first pinion gear 25 rotates while meshing with the second pinion gear 25, the second pinion gear 26 also rotates together with the first pinion gear 25, so that the second rack gear 23 moves while meshing with the second pinion gear 26. The rear cover 12 can be moved in conjunction with the front cover 11.

  Therefore, by opening / closing only the front lid 11, the rear lid 12 can be opened / closed in conjunction with the front lid 11, so that the keyboard lid 10 can be easily opened / closed, and the keyboard lid 10 can be opened / closed. The first and second pinion gears 25 and 26 have different diameters R1 and R2 depending on the movement distances of the front lid 11 and the rear lid 12, respectively. Thus, since the moving speeds of the front lid 11 and the rear lid 12 can be changed, even if the moving distances of the front lid 11 and the rear lid 12 are different, the front lid 11 and the rear lid 12 are the same. At the timing, it can be arranged in a plane above the keyboard portion 7 and can be satisfactorily stored in the instrument case 1 with the front lid 11 and the rear lid 12 being overlapped.

  In the above-described embodiment, the case where the first and second pinion gears 25 and 26 are configured to rotate together in an integrated manner has been described. However, the first and second pinion gears are not necessarily limited. The first and second pinion gears 25 and 26 may be configured to rotate independently and separately, without being configured to rotate in an integrated manner. If comprised in this way, since the front cover 11 and the rear cover 12 do not interlock | cooperate, what is necessary is just to open and close separately.

  In the above-described embodiment, the case where the keyboard lid 10 is divided into the front lid 11 and the rear lid 12 has been described. However, the present invention is not limited thereto, and the keyboard lid is divided into three or more lid portions. Also good. In this case, a plurality of rack gears are attached to each of the three or more cover parts, and a plurality of pinion gears that mesh with the plurality of rack gears are provided in the musical instrument case 1, and a plurality of cover parts are provided. A plurality of lid guide portions for guiding and a plurality of gear guide portions for guiding a plurality of rack gears may be provided in the instrument case 1 respectively.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 7 Keyboard part 10 Keyboard cover 13 Cover opening / closing device 14 Front cover guide part 15 Rear cover guide part 17 Front support pin 18 Front guide rail 20 Rear support pin 21 Rear guide rail 22, 23 1st, 2nd Rack gears 22a, 23a meshing teeth 24 shafts 25, 26 first and second pinion gears 25a, 26a meshing teeth 27, 28 first and second gear guide portions 27a, 28a openings

Claims (4)

An instrument case with an internal keyboard,
A keyboard lid comprising a plurality of lid portions slidably provided on the instrument case and covering the keyboard portion so as to be freely opened and closed;
A plurality of rack gears extending from each rear portion of the plurality of lid portions in the keyboard lid toward the rear portion in the musical instrument case, respectively, and flexibly moving in accordance with opening and closing operations of the plurality of lid portions;
A plurality of pinion gears that are rotatably provided at the rear portion in the instrument case, respectively, and mesh with the plurality of rack gears, respectively, and rotate.
A keyboard instrument cover comprising: a plurality of gear guide portions that guide the plurality of rack gears according to opening / closing operations of the plurality of lid portions, and a plurality of gear guide portions that press and mesh with the plurality of pinion gears, respectively. Switchgear.   Each of the lids provided in the instrument case respectively guides the plurality of lids according to an opening / closing operation, and when the keyboard lid is closed, the plurality of lids are arranged in a plane above the keyboard portion; The keyboard instrument cover according to claim 1, further comprising a plurality of lid guide portions for storing the plurality of lid portions in a musical instrument case so as to overlap each other when the keyboard lid is opened. Switchgear. 3. The lid opening / closing device for a keyboard instrument according to claim 1, wherein each of the plurality of pinion gears has a different diameter depending on a moving distance of the plurality of lids. Wherein the plurality of pinion gears, all keyboard instruments cover opening and closing device according to any one of claims 1 to 3, characterized in that rotates in conjunction integrally.

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