JP2016080859A - Key unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key unit which avoids the trouble of having to shave off a protrusion (burr) and makes a keyboard device into a simple configuration.SOLUTION: A key unit 20 has a plurality of keys 21 arranged in parallel in a longitudinal direction, rear ends of which are connected to a long rail part 25 extending in the longitudinal direction and fixed to a key frame through plate-like lateral hinge parts 23 made by horizontally placing a plate surface, respectively. The key unit 20 is integrally molded by injecting resin into the mold. The key unit 20 comprises connection parts 22a and 22c for connecting the rear ends of the plurality of keys 21 and the rail part 25 through the lateral hinge parts 23, respectively. Width in the longitudinal direction of the lateral hinge parts 23 and the connection parts 22a and 22c is the size that a gap is present between the adjacent lateral hinge parts 23 and connection parts 22a and 22c. When molding the key unit 20 with a mold, a predetermined portion located within the width in the longitudinal direction of the connection parts 22a and 22c is a gate corresponding part 26 for injecting resin.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a key unit having a plurality of keys in which the rear ends of a plurality of keys are respectively connected to a long rail portion extending in the left-right direction by integral molding using a mold.

  Conventionally, for example, the rear ends of a plurality of keys extending in the front-rear direction and arranged in parallel in the left-right direction are attached to a long rail portion extending in the left-right direction and fixed to the key frame. 2. Description of the Related Art A key unit having a plurality of keys that are connected to each other via a flat plate-like horizontal hinge portion whose surfaces are horizontal is well known. The keyboard device is configured by stacking the rail portions of the plurality of key units configured as described above on the key frame.

  The following Patent Document 1 shows a key unit having a plurality of keys in which a plate-like vertical hinge portion having a vertical plate surface is interposed between rear ends of a plurality of keys and a plurality of horizontal hinge portions. Has been. And this kind of key unit is integrally molded using a metal mold | die as shown by the following patent document 1. FIG.

  Further, when a key is molded by injecting resin into a mold, as shown in Patent Document 2 below, protrusions (burrs) remaining in a state where the key is removed from the mold are on the appearance. In order not to cause a problem, the outer side of the lower end of the key is generally a gate corresponding portion into which resin is injected.

  In addition, in Patent Document 3 below, the connection part between each key and the rail part includes a thick key body interlocking part extending rearward and both sides from the rear end of the key, both end parts and the rail part. Also shown is a key unit configured with a pair of thin horizontal hinges connecting the two. In the keyboard device shown in Patent Document 3 below, a plurality of key units are assembled with the rail portion overlapped on the key frame with the adjacent key body interlocking portion and the lateral hinge overlapped in the vertical direction. Configured. In addition, when the key unit mold is integrally molded, the resin is injected into the mold by using a part of the upper surface between the pair of horizontal hinges and entering the rear of the key body interlocking portion as a gate corresponding portion. I have to.

JP-A-64-91186 JP-A-9-134160 JP-A-10-240228

  However, the key unit shown in the above-mentioned Patent Document 1 (the same as the key shown in the above-mentioned Patent Document 2) is arranged so that the gate corresponding portion is located outside the lower end of the key as shown in the above-mentioned Patent Document 2. When the resin is poured into the mold, a protrusion (burr) remains on the outer side of the lower end of the key in a state where the key unit (or key) is taken out from the mold. Therefore, in a state where a plurality of key units (or keys) are fixed on the key frame and the plurality of keys are arranged in the left-right direction, when the key is pressed or released, the protrusion comes into contact with the adjacent key, and the key May generate unusual noise or the key may vibrate. For this reason, in the manufacturing process of a keyboard apparatus, it is necessary to scrape a protrusion and there exists a problem that it takes time to manufacture a keyboard apparatus.

  On the other hand, in the key unit and integral molding shown in Patent Document 3, there is no problem of abnormal noise due to contact with the key adjacent to the protrusion and vibration of the key, so it is not necessary to scrape the protrusion. However, the structure of the connection part for connecting each key and the rail part is complicated. In addition, the horizontal hinge and the connecting portion corresponding to one key are formed wide in the left-right direction, and the adjacent horizontal hinges and the connecting portions are arranged so as to overlap each other in the vertical direction. Requires large space for placement. Therefore, when the keyboard device is configured using the key unit disclosed in Patent Document 3, the configuration of the rear portion of the keyboard device becomes complicated.

  The present invention has been made to cope with such problems, and an object of the present invention is to provide a key unit for realizing a keyboard device having a simple structure while eliminating the trouble of scraping the protrusions (burrs). There is to do. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

  In order to achieve the above-described object, the present invention is characterized by a plurality of keys (21, 31, 41) extending in the front-rear direction and arranged in parallel in the left-right direction, and extending in the left-right direction. A long rail portion (25, 35, 45) fixed to the key frame (10) and a flat plate shape provided between the rear ends of the plurality of keys and the rail portion so that the plate surface is horizontal. A key unit (20, 30, 40) having a plurality of lateral hinge portions (23, 33, 34, 28b) and having a plurality of keys integrally molded by injecting resin into the mold (51, 52). A plurality of connecting portions (22a, 22c, 32a, 32c, 42a, 42c, 28a, 28c) for connecting the rear ends of the plurality of keys and the rail portions via the plurality of horizontal hinge portions, respectively; The horizontal width of the hinge part and multiple connecting parts In order to inject a resin into a predetermined portion located within the width in the left-right direction of the connecting portion when the key unit is integrally formed with the mold. The gate corresponding parts (26, 36, 46, 71, 73, 75, 76, 77) are used.

  In this case, the horizontal width of the plurality of horizontal hinge portions and the plurality of connecting portions is set to a size in which there is a gap between the adjacent horizontal hinge portion and the connecting portion. If the connecting function of the connecting portion is exhibited, it means that the horizontal width of the plurality of horizontal hinge portions and the plurality of connecting portions may be smaller than the horizontal width of the rear end of each key. Also, since there is a slight gap in the left-right direction between the rear ends of adjacent keys, the horizontal width of the plurality of horizontal hinge portions and the plurality of connecting portions is the same as the horizontal width of the rear end of each key, It also means that it may be larger than the lateral width of the rear end of each key as long as adjacent horizontal hinge portions and connecting portions do not contact each other or overlap in the vertical direction.

  Further, in the above-described feature of the present invention, for example, a plurality of flat plate-like plates each provided at the front or rear of the plurality of horizontal hinge portions between the rear ends of the plurality of keys and the rail portions and having the plate surface vertical. A vertical hinge portion (22b, 32b, 42b) is provided, and the connecting portion is a vertical hinge connecting portion (22a, 22c, 32a, 32c, 42a, 42c) provided in front of or behind the plurality of vertical hinge portions, respectively. The predetermined portions that are respectively configured and located within the width in the left-right direction on the upper surface of the vertical hinge connecting portion may be the gate corresponding portions (26, 36, 46, 71). In addition, a plurality of plate-like vertical hinge portions (22b, 32b, 42b) which are respectively provided in front or rear of the plurality of horizontal hinge portions between the rear ends of the plurality of keys and the rail portions and whose plate surfaces are vertical. Each of the vertical hinge connecting portions (22a, 22c, 32a, 32c, 42a, 42c) provided in front of or behind the plurality of vertical hinge portions. The gate corresponding portion (73, 75) may be formed on the upper surface of the protruding portion (72, 74) provided in a predetermined portion located in the rear side surface or the front side surface. Further, each of the connecting portions is constituted by a horizontal hinge connecting portion (22c, 32c, 42c, 28a, 28c) provided respectively in front of or behind the plurality of horizontal hinge portions, and on the upper surface of the horizontal hinge connecting portion. The predetermined part located within the width in the left-right direction may be the gate corresponding part (71, 76, 77).

  In the key unit configured in this manner, the horizontal width of the horizontal hinge portion and the connecting portion is set to a size such that there is a gap between the adjacent horizontal hinge portion and the connecting portion. The horizontal hinge portions and the connecting portions do not overlap in the vertical direction, and the configuration of the keyboard device configured by combining a plurality of key units is simplified, and the space in which the horizontal hinge portions and the connecting portions are arranged It doesn't matter if it is narrow. Further, the connecting portion is located behind the rear end of the key, and a gate corresponding portion for injecting resin when the key unit is integrally formed is provided in a portion positioned within the width in the left-right direction of the connecting portion. For this reason, even if protrusions (burrs) remain in the gate corresponding portion, the connecting portion, that is, the gate corresponding portion is a portion covered by the upper cover, and there is no problem in appearance of the keyboard device. In addition, there is no problem of generation of abnormal noise due to contact with the adjacent key and vibration of the key.

1 is a schematic plan view of a keyboard device including keys for one octave according to a first embodiment of the present invention. It is a side view of the keyboard apparatus of FIG. (A) is a top view of the 1st key unit of Drawing 1 and Drawing 2, (B) is a front view of the 1st key unit, and (C) is a side view of the 1st key unit. (A) is a top view of the 2nd key unit of FIG.1 and FIG.2, (B) is a front view of the said 2nd key unit, (C) is a side view of the said 2nd key unit. (A) is a top view of the 3rd key unit of FIG.1 and FIG.2, (B) is a front view of the said 3rd key unit, (C) is a side view of the said 3rd key unit. (A) is sectional drawing for demonstrating resin molding of a key unit, (B) is an expanded sectional view of the injection part of the resin of (A). It is sectional drawing which shows the other resin molding example of a key unit. (A) is an enlarged plan view showing a portion near the vertical hinge region of the first key unit according to a modification of the first embodiment, and (B) is an enlarged side view showing a portion near the vertical hinge region. . (A) is an enlarged plan view showing a portion near the vertical hinge region of the first key unit according to the second embodiment, and (B) is an enlarged side view showing a portion near the vertical hinge region. (A) is an enlarged plan view showing a portion near the vertical hinge region of the first key unit according to a modification of the second embodiment, and (B) is an enlarged side view showing a portion near the vertical hinge region. . (A) is a top view of the 1st key unit which concerns on 3rd Embodiment, (B) is a front view of the said 1st key unit, (C) is a side view of the said 1st key unit. (A) is an enlarged plan view showing a portion near the horizontal hinge region of the first key unit according to the third embodiment, and (B) is an enlarged side view showing a portion near the horizontal hinge region. (A) is an enlarged plan view showing a portion near the horizontal hinge region of the first key unit according to a modification of the third embodiment, and (B) is an enlarged side view showing a portion near the horizontal hinge region. .

a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of a keyboard apparatus including keys for one octave according to the first embodiment, and FIG. 2 is a side view of the keyboard apparatus. In this specification, the player side (the lower side in FIG. 1 and the left side in FIG. 2) is the front of the keyboard device, and the opposite side (the upper side in FIG. 1 and the right side in FIG. 2) is the keyboard device. It will be backward. The left / right direction of the performer (left / right direction in FIG. 1) is defined as the left / right direction of the keyboard device.

  The keyboard device has a key frame 10 fixed in the keyboard instrument below the keyboard. The key frame 10 has a flat plate-like lower step wall 11 extending horizontally in the left and right and front and rear directions at the front, and a plate-like upright wall 12 erected upward at the rear end of the lower step wall 11; At the upper end of the upright wall 12, the upper wall 13 extends horizontally and has a predetermined width and is long and flat in the left-right direction. The lower step wall 11, the upright wall 12, and the upper step wall 13 are integrally formed of metal, resin, or the like. On the upper wall 13, first to third key units 20, 30, 40 integrally molded with resin are placed at the rear end portions. Further, in order to fix the first to third key units 20, 30, and 40 by screwing fixing screws (not shown) into appropriate portions of the upper wall 13, the upper surface from the upper surface to the lower surface formed with the internal threads are formed. A circular screw hole 13a is also provided in communication therewith.

  On the lower step wall 11, frame side guide members 14 respectively corresponding to white keys 21 and 31 and a black key 41 described later are provided integrally with the lower step wall 11. The frame-side guide member 14 regulates the displacement of the white keys 21, 31 and the black key 41 in the left-right direction when the white keys 21, 31 and the black key 41 are pressed / released. This guides the movement of the key 41 in the vertical direction. The frame-side guide member 14 is configured to have a rectangular parallelepiped shape having a groove cut out rearward from the central portion of the front surface, that is, a substantially U-shaped cross-sectional shape. The frame-side guide member 14 protrudes vertically and upward from the upper surface of the lower wall 11 at a position where the lower surfaces of the white keys 21 and 31 and the black key 41 face each other. The frame-side guide members 14 for the white keys 21 and 31 are arranged in a line in the left-right direction at a position slightly ahead of the center position in the front-rear direction of the white keys 21 and 31, and the frame-side guide members 14 for the black keys 41 are white. They are arranged in a line in the left-right direction at a position slightly behind the frame-side guide member 14 for the keys 21 and 31.

  Next, the 1st key unit 20 is demonstrated using the top view of FIG. 3 (A), the front view of FIG. 3 (B), and the side view of FIG. 3 (C). The first key unit 20 has four white keys 21 that are not adjacent to each other corresponding to the pitch names C, E, G, and B, respectively. The white key 21 is composed of an upper wall, a front wall, a side wall, and a rear wall, and forms a rectangular space with the inside opened downward. However, the broken line which shows the inner surface by the plate | board thickness of an upper wall, a front wall, a side wall, and a rear wall is abbreviate | omitted in drawing. Steps are provided on the upper wall and the side wall to secure the space for the black key 41.

  The rear walls of these four white keys 21 are connected to the rail portion 25 via the vertical hinge region 22, the horizontal hinge 23, and the rail connection portion 24, respectively. The vertical hinge region 22, the horizontal hinge 23, the rail connecting portion 24, and the rail portion 25 are integrally formed with the white key 21. The vertical hinge region 22 includes a vertical hinge connecting portion 22a, a vertical hinge 22b, and a vertical hinge connecting portion 22c. The vertical hinge connecting portion 22 a has a width equal to the width of the rear end portion of the white key 21, a relatively thick wall whose upper surface is lower than the upper surface of the white key 21 and whose lower surface is the same as the lower surface of the white key 21. It has a rectangular parallelepiped shape. The vertical hinge connecting portion 22a is integrally connected to the rear end of the white key 21 at the front end. The vertical hinge 22b has the same vertical length as that of the vertical hinge connecting portion 22a, and is formed into a thin, square and flat plate with the plate surface vertical so as to be elastically deformed in the horizontal direction. Yes. And the vertical hinge 22b is integrally connected to the center position of the left-right direction in the rear end of the vertical hinge connection part 22a in the front end. The vertical hinge connecting portion 22c is configured in a relatively thick rectangular parallelepiped shape having a horizontal width and a vertical thickness equal to the horizontal width and the vertical thickness of the vertical hinge connecting portion 22a. However, the length in the front-rear direction of the vertical hinge connection portion 22c is slightly shorter than the length in the front-rear direction of the vertical hinge connection portion 22a. In addition, the length of the longitudinal hinge connection part 22c in the front-rear direction may be equal to or longer than the length of the longitudinal hinge connection part 22a in the front-rear direction. And the vertical hinge connection part 22c has connected the rear end of the vertical hinge 22b integrally in the center position of the left-right direction in a front end. Further, the vertical hinge 22b may be connected to the rear end of the vertical hinge connecting portion 22a and the front end of the vertical hinge connecting portion 22c while being shifted from the center position in the left-right direction. Moreover, since this vertical hinge connection part 22c is connected with the horizontal hinge 23 so that it may mention later, it can also be grasped | ascertained as a horizontal hinge connection part.

  The lateral hinge 23 has a lateral width equal to the lateral width of the rear end portion of the white key 21 and the longitudinal hinge coupling portions 22a and 22c, and is thin, rectangular and flat with the plate surface horizontal so that it can be easily elastically deformed in the vertical direction. It is configured. And the horizontal hinge 23 is integrally connected to the intermediate position of the up-down direction in the rear end of the vertical hinge connection part 22c in the front end. The rail connecting portion 24 is also configured in a relatively thick rectangular parallelepiped shape having a lateral width and a vertical thickness equal to the horizontal width and the vertical thickness of the vertical hinge connecting portions 22a and 22c. And the rail connection part 24 has connected the rear end of the horizontal hinge 23 integrally in the intermediate position of the up-down direction in a front end.

  The rail portion 25 is a member that has a rectangular longitudinal cross section and is elongated in the horizontal direction, and has the same thickness as the vertical hinge connecting portions 22 a and 22 c and the rail connecting portion 24. In addition, the thickness of the rail part 25 may not be the same thickness as the vertical hinge connection parts 22a and 22c and the rail connection part 24. The rail portion 25 is connected to the rear end of the rail connecting portion 24 at each rear end position of the white key 21 in the horizontal direction. The total width in the front-rear direction of the rail connection portion 24 and the rail portion 25 is equal to the front-rear width of the upper wall 13 of the key frame 10, and the rail connection portion 24 and the rail portion 25 are placed on the upper wall 13. Further, the rail portion 25 is also provided with a circular through hole 25a that communicates from the upper surface to the lower surface for allowing the fixing screw to pass therethrough at a location corresponding to the screw hole 13a provided in the upper wall 13.

  In addition, thin and cylindrical protrusions 26 are integrally formed on the upper surfaces of the plurality of vertical hinge connecting portions 22a, respectively. These protrusions 26 are provided in front of the vertical hinge 22b so that the central axis thereof coincides with the horizontal center line of the vertical hinge 22b. Further, the upper end of the protrusion 26 is lower than the upper surface of the white key 21. The protrusion 26 corresponds to a resin injection portion when the first key unit 20 described later is resin-molded, and corresponds to the gate corresponding portion of the present invention.

  Further, a key-side guide member 27 is provided integrally with the white key 21 at a position on the lower surface of the white key 21 that faces the frame-side guide member 14. The key-side guide member 27 has a cross-sectional shape of an E shape with the rear opened, and protrudes vertically and downward from the lower surface of the white key 21. When the first key unit 20 is assembled to the key frame 10, the E-shaped central projecting piece is slidably engaged in a groove provided in the frame side guide member 14, and the key side The guide member 27 cooperates with the frame side guide member 14 to guide the displacement of the white key 21 in the vertical direction.

  Next, the 2nd key unit 30 is demonstrated using the top view of FIG. 4 (A), the front view of FIG. 4 (B), and the side view of FIG. 4 (C). The second key unit 20 has three white keys 31 that are not adjacent to each other corresponding to the pitch names D, F, and A, respectively. The white key 31 is also composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. The length and height of the white key 31 in the front-rear direction are the same as in the case of the white key 21. However, the step portion is different from the case of the white key 21 in order to secure the space for the black key 41 provided on the upper wall and the left and right side walls.

  The rear walls of these three white keys 31 are connected to the rail portion 35 via the vertical hinge connecting portion 32a, the vertical hinge region 32 composed of the vertical hinge 32b and the vertical hinge connecting portion 32c, the horizontal hinge 33, and the rail connecting portion 34. Each is connected. The vertical hinge region 32 including the vertical hinge connecting portion 32a, the vertical hinge 32b, and the vertical hinge connecting portion 32c, the horizontal hinge 33, the rail connecting portion 34, and the rail portion 35 are also the vertical hinge of the white key 21 of the first key unit 20. The vertical hinge region 22 including the connecting portion 22a, the vertical hinge 22b, and the vertical hinge connecting portion 22c, the horizontal hinge 23, the rail connecting portion 24, and the rail portion 25 are configured in substantially the same manner, and are integrally formed with the white key 31. .

  However, the rail portion 35 of the second key unit 30 is placed on the rail portion 25 of the first key unit 20. Therefore, the height of the lower surface of the rail portion 35 coincides with the height of the upper surface of the vertical hinge region 32, and the upper surface of the rail portion 35 is located slightly above the upper surface of the white key 31. The rail connecting portion 34 extends upward from the rear end of the lateral hinge 33. When the second key unit 30 is assembled to the key frame 10, the rail connection portion 34 is located on the side of the rail connection portion 24 of the first key unit 20. The vertical hinge 32b and the horizontal hinge 33 are positioned at the same height as the vertical hinge 22b and the horizontal hinge 23 of the first key unit 20, respectively. In this case as well, the vertical hinge connecting portion 32c can be regarded as a horizontal hinge connecting portion.

  In addition, a cylindrical projection 36 having the same small diameter as the projection 26 of the first key unit 20 is provided on the upper surface of the vertical hinge connecting portion 32a with its central axis coinciding with the horizontal center line of the vertical hinge 32b. ing. In addition, the rail portion 35 is also provided with a circular through hole 35 a that communicates from the upper surface to the lower surface for allowing the fixing screw to pass therethrough at a location corresponding to the screw hole 13 a provided in the upper wall 13. Further, a key side guide member 37 similar to the key side guide member 27 of the first key unit 20 is integrally formed with the white key 31 at a position on the lower surface of the white key 31 facing the frame side guide member 14. Is provided.

  Next, the 3rd key unit 40 is demonstrated using the top view of FIG. 5 (A), the front view of FIG.5 (B), and the side view of FIG.5 (C). The third key unit 20 has five black keys 41 that are not adjacent to each other corresponding to the pitch names C #, D #, F #, G #, and A #. The black key 41 is also composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. However, the length of the black key 41 in the front-rear direction is shorter than the length of the white key 21, 31 in the front-rear direction, and the height of the black key 41 is higher than the height of the white keys 21, 31. Further, the front wall of the black key 41 is inclined so as to be positioned forward and downward.

  The rear walls of these five black keys 41 are connected to the rail portion 45 via the vertical hinge region 42 comprising the vertical hinge connecting portion 42a, the vertical hinge 42b and the vertical hinge connecting portion 42c, the horizontal hinge 43, and the rail connecting portion 44. Each is connected. The vertical hinge region 42 including the vertical hinge connection portion 42a, the vertical hinge 42b, and the vertical hinge connection portion 42c, the horizontal hinge 43, the rail connection portion 44, and the rail portion 45 are also the vertical hinge of the white key 21 of the first key unit 20. The vertical hinge region 22, the horizontal hinge 23, the rail connecting portion 24, and the rail portion 25 including the connecting portion 22 a, the vertical hinge 22 b, and the vertical hinge connecting portion 22 c are configured in substantially the same manner and are integrally molded with the black key 41. .

  However, the rail portion 45 of the third key unit 40 is placed on the rail portion 35 of the second key unit 30. Therefore, the lower surface of the rail portion 45 is positioned higher than the upper surface of the vertical hinge region 42, and the upper surface of the rail portion 35 is positioned slightly below the upper surface of the black key 41. The rail connecting portion 44 extends upward from the rear end of the horizontal hinge 43 and is integrally connected to the lower surface of the front end of the rail portion 45. The width of the rail portion 45 in the front-rear direction is larger than the width in the front-rear direction of the rail portions 25, 35 of the first and second key units 20, 30, and the rail connecting portions 24, 24 of the first and second key units 20, 30 are larger. 34 is larger by the width in the front-rear direction. In the assembled state of the third key unit 40 to the key frame 10, the rail connecting portion 44 is located on the side of the rail connecting portions 24, 34 of the first and second key units 20, 30, and the first and The upper surfaces of the rail connecting portions 24 and 34 of the second key units 20 and 30 are positioned below the rail portion 45. The vertical hinge 42b and the horizontal hinge 43 are positioned at the same height as the vertical hinges 22b and 32b and the horizontal hinges 23 and 43 of the first and second key units 20 and 30, respectively. In this case as well, the vertical hinge connecting portion 42c can be regarded as a horizontal hinge connecting portion.

  Further, a cylindrical projection 46 having the same small diameter as the projection 26 of the first key unit 20 is provided on the upper surface of the vertical hinge connecting portion 42a with the central axis thereof aligned with the horizontal center line of the vertical hinge 42b. ing. Further, the rail portion 45 is also provided with a circular through hole 45a communicating from the upper surface to the lower surface for allowing the fixing screw to pass through at a position corresponding to the screw hole 13a provided in the upper wall 13. Further, a key side guide member 47 similar to the key side guide member 27 of the first key unit 20 is integrally formed with the black key 41 at a position on the lower surface of the black key 41 facing the frame side guide member 14. Is provided.

  Next, the assembly of the first to third key units 20, 30, and 40 configured as described above to the key frame 10 will be described. In this assembly, first, the first to third key units 20, 30, 40 are brought closer to the key frame 10 in this order with the rear ends thereof being inclined so as to be higher than the front ends. That is, the rail portion 25 of the first key unit 20 is placed on the upper surface of the upper wall 13 of the key frame 10, and then the rail portion 35 of the second key unit 30 is placed on the rail portion 25 of the first key unit 20. Next, the rail part 45 of the third key unit 40 is placed on the rail part 35 of the second key unit 30. When the first to third key units 20, 30, 40 are assembled to the key frame 10, the key side guide members 27, 37, 47 of the white keys 21, 31 and the black key 41 are used as the frame side guides of the key frame 10. Each member 14 needs to be engaged. In this case, the vertical hinges 22b, 32b, and 42b allow the white keys 21, 31 and the black key 41 to be displaced in the left-right direction due to their elastic deformation, so the first to third key units 20, 30, 40 are used. Assembling work to the key frame 10 becomes simple.

  After the first to third key units 20, 30, 40 are assembled to the key frame 10, screws (not shown) are attached to the rail portions 45, 35 of the third key unit 40, the second key unit 30, and the first key unit 20. , 25, through the through holes 45a, 35a, 25a in this order from above, and screwed into the screw holes 13a provided in the upper wall 13 of the key frame 10. As a result, the first to third key units 20, 30, and 40 are firmly fixed to the key frame 10 to complete the keyboard device.

  In the keyboard device configured as described above, the vertical hinge region 22 including the vertical hinge connecting portions 22a, 32a, 42a, the vertical hinges 22b, 32b, 42b, and the vertical hinge connecting portions (horizontal hinge connecting portions) 22c, 32c, 42c, 32, 42, horizontal hinge portions 23, 34, 44, and rail connecting portions 24, 34, 44 have horizontal widths that are the same as the horizontal widths of the rear ends of white keys 21, 31 and black key 41, respectively. The configuration of the keyboard device configured by combining the first to third key units 20, 30, 40 is simplified. Further, the space in which the vertical hinge regions 22, 32, 42, the horizontal hinge portions 23, 34, 44, and the rail connection portions 24, 34, 44 are arranged can be narrow.

  In the keyboard device thus completed, when the performer presses the white keys 21, 31 and the black key 41, the white keys 21, 31 and the black key 41 are elastically deformed by the horizontal hinges 23, 33, 43. Accordingly, the front ends thereof are displaced downward around the rear end. At this time, the key side guide members 27, 37, 47 are displaced downward along the frame side guide member 14. That is, the white keys 21, 31 and the black key 41 are key-guided by the groove of the frame side guide member 14 which is a key guide portion, and their front ends are displaced downward. Therefore, the lateral displacement of the key-side guide members 27, 37, 47, that is, the white keys 21, 31, and the black key 41 is restricted, and the white keys 21, 31, and the black key 41 are displaced substantially vertically downward without being shaken. To do. When the pressed white keys 21, 31 and the black key 41 are released, the white keys 21, 31 and the black key 41 are restored to the restoring force of the horizontal hinges 23, 33, 43 and other members (contacts not shown). Due to the restoring force of the spring component such as rubber, the front ends thereof are displaced upward to return to their original positions. Also in this case, the white keys 21, 31 and the black key 41 are key-guided as in the case of the key depression.

  In such a key pressing operation of the white keys 21, 31 and the black key 41, the horizontal hinges 23, 33, 43 of the white keys 21, 31 and the black key 41 are arranged at the same height. , 31 and the black key 41 have the same fulcrum height position when swinging in the front-rear direction, so that the player can press and release all the white keys 21, 31 and the black key 41 in a similar manner without any discomfort. Can be operated.

  Next, resin molding of the first to third key units 20, 30, and 40 configured as described above will be described with reference to the drawings. 6A is a cross-sectional view for explaining resin molding of the first key unit 20, and FIG. 6B is an enlarged cross-sectional view of the resin injection portion of FIG. 6A.

  First, the operator prepares an upper mold 51 and a lower mold 52. A space corresponding to the shape of the first key unit 20 described above is provided between the upper mold 51 and the lower mold 52. In the upper mold 51, the position corresponding to the upper ends of the plurality of protrusions 26 provided on the upper surface of the vertical hinge coupling portion 22a corresponding to the plurality of white keys 21 is the lower end, the lower end is made smaller in diameter, and the upper mold 51 is directed upward. A plurality of holes 51a communicating with the outside having a conical portion and a cylindrical portion having a large diameter are provided. A thin metal runner member 61 for pouring liquid resin into the upper mold 51 and the lower mold 52 is assembled and fixed on the inner peripheral surface of the hole 51a. The outer shape of the runner member 61 is the same as the inner shape of the hole 51a. At the lower end of the runner member 61, a gate 61a, which is a circular and narrow passage that communicates with the internal space of the upper mold 51, is provided.

  Next, the operator inserts a plurality of pipes for injecting a liquid resin discharged from an injection device (not shown) into the plurality of runner members 61. And the resin in the state heated and melt | dissolved by the injection apparatus is each inject | poured in the some runner member 61 through a pipe. The resin injected into the runner member 61 passes through the gate 61 a and is guided to the space between the upper mold 51 and the lower mold 52. As a result, the space between the upper mold 51 and the lower mold 52 is filled with the injected resin, and the resin is solidified by subsequent cooling to form the first key unit 20.

  The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above. However, since the shapes of the second and third key units 30 and 40 are different, the shapes of the upper mold 51 and the lower mold 52 for the second and third key units 30 and 40 are the same as those for the first key unit 20. The shapes of the upper mold 51 and the lower mold 52 are different.

  In the keyboard apparatus resin-molded in this way, protrusions (burrs) 26, 36, 46 which are gate corresponding parts corresponding to the gate 61a are formed on the upper surfaces of the vertical hinge connecting parts 22a, 32a, 42a. However, the vertical hinge connecting portions 22a, 32a, and 42a are located behind the rear ends of the white keys 21, 31 and the black key 41, and the vertical hinge connecting portions 22a, 32a, and 42a, that is, the protrusions 26, 36, and 46 are the upper cover. Therefore, there is no problem in appearance of the keyboard device. Further, since the protrusions 26, 36, 46 are located at the center in the left-right direction of the vertical hinge connecting portions 22a, 32a, 42a having the same lateral width as the lateral width of the rear ends of the white keys 21, 31 and the black key 41, There is no problem of generation of abnormal noise due to contact with the adjacent white keys 21, 31 and the black key 41, and vibration of the white keys 21, 31 and the black key 41.

  In the resin molding, resin is injected from a position corresponding to the protrusions 26, 36, and 46, and the protrusions 26, 36, and 46 have the same horizontal position as the vertical hinges 22b, 32b, and 42b. As a result, even when the injection pressure of the resin by the injection device is not so high, the resin is contained in the vertical hinges 22b, 32b, 42b, the vertical hinge connecting portions 22c, 32c, 42c, the horizontal hinges 23, 33, 43, and the rail connection portion 24. , 34, and 44, the rail portions 25, 35, and 45 flow into the rail portions 25, 35, and 45, respectively. Further, the positions corresponding to the protrusions 26, 36, and 46 as the resin injection positions are on the upper surfaces of the vertical hinge connecting portions 22a, 32a, and 42a, and the vertical hinge connecting portions 22a, 32a, and 42a are white keys 21, 31 and black. Since it is located in the vicinity of the rear end of the key 41, even if the front and rear lengths of the white keys 21, 31 and the black key 41 are somewhat long, the resin can easily flow into the front ends of the white keys 21, 31 and the black key 41. , 31 and the black key 41 are molded well.

  In the first embodiment, the protrusions 26, 36, 46 are provided on the upper surfaces of the vertical hinge connecting portions 22a, 32a, 42a of the first to third key units 20, 30, 40, and the runner member 61 of the injection device is provided. The tip of the mold is positioned at a position corresponding to the upper ends of the protrusions 26, 36, 46, and the resin is injected into the space between the upper mold 51 and the lower mold 52. However, the protrusions 26, 36, and 46 function in the assembling work of the first to third key units 20, 30, and 40 to the key frame 10, and the pressing and releasing keys of the white keys 21, 31 and the black key 41. Not part. Therefore, the protrusions 26, 36, 46 may be eliminated.

  In this case, as shown in FIG. 7 corresponding to FIG. 6A, a plurality of holes 51a are provided on the upper surface of the vertical hinge connecting portion 22a, with the positions where the plurality of protrusions 26 are provided at the lower ends. The shape of the hole 51a is the same as that described above. The plurality of runner members 61 described above are assembled and fixed in the plurality of holes 51a. Then, the resin that is heated and melted from the injection device is injected into the space between the upper mold 51 and the lower mold 52 through the gate 61a. According to this, the 1st key unit 20 which does not have the protrusion 26 is formed. However, resin traces (burrs) corresponding to the upper and lower thickness of the gate 61a remain. The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above. The modification of the first embodiment shown in FIG. 7 is applied to various modifications in addition to the second and third embodiments described later.

  In the first embodiment, the protrusions 26, 36, 46 are positioned at the center in the left-right direction on the upper surfaces of the vertical hinge connecting portions 22a, 32a, 42a. However, instead of this, the protrusions 26, 36, 46 may be positioned at positions shifted from the center in the left-right direction on the upper surface of the vertical hinge connecting portions 22a, 32a, 42a to the left or right. In this case, the flow of the resin into the rail portions 25, 35, 45 during the injection of the resin is slightly worse than in the case of the first embodiment. However, the resin flows into the white keys 21, 31 and the black key 41 are almost the same as in the first embodiment, and the appearance problem of the portion located behind the vertical hinge connecting portions 22a, 32a, 42a. There is no such thing as a big problem.

  Next, another modification of the first embodiment will be described with reference to the drawings. FIG. 8A is an enlarged plan view showing the vicinity of the vertical hinge region 22 of the first key unit 20 according to another modification of the first embodiment, and FIG. 8B is the vertical hinge region 22. It is an enlarged side view which shows the vicinity part.

  In this modification, instead of the protrusion 26, a plurality of protrusions 71 having the same shape as the protrusion 26 are integrally formed on the upper surfaces of the plurality of vertical hinge connecting portions 22c. These protrusions 71 are provided on the rear side of the vertical hinge 22b so that the central axis thereof coincides with the horizontal center line of the vertical hinge 22b. In this case as well, the upper end of the protrusion 71 is lower than the upper surface of the white key 21.

  And about the some hole 51a provided in the upper metal mold | die 51 mentioned above, the lower end is match | combined with the upper end position of the some protrusion 71. FIG. Also in this case, if the resin that has been heated and melted by the injection device is injected into the space between the upper mold 51 and the lower mold 52 through the gate 61a of the runner member 61, The first key unit 20 is configured. The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above.

  In the resin-molded keyboard device according to this modification, the vertical hinge connecting portions 22c, 32c, and 42c are behind the rear ends of the white keys 21 and 31 and the black key 41, as in the case of the first embodiment. Since the protrusion 71 is a portion covered by the upper cover, there is no problem in appearance of the keyboard device. Further, since the protrusion 71 is located at the center in the left-right direction of the vertical hinge connecting portions 22c, 32c, 42c having the same lateral width as the lateral width of the rear ends of the white keys 21, 31 and the black key 41, the adjacent white key There is no problem of generation of abnormal noise due to contact with 21, 21, and the black key 41, and vibration of the white keys 21, 31 and the black key 41.

  In this resin molding, resin is injected from a position corresponding to the protrusion 71, and the protrusion 71 has the same position in the left-right direction as the vertical hinges 22c, 32c, 42c. Thereby, even when the injection pressure of the resin by the injection device is not so high, the resin flows into the rail portions 25, 35, and 45 via the horizontal hinges 23, 33, and 43 and the rail connection portions 24, 34, and 44, respectively. The rail portions 25, 35, and 45 are molded well. However, since the resin injected into the white keys 21, 31 and the black key 41 passes through the vertical hinges 22b, 32b, 42b and the vertical hinge connecting portions 22a, 32a, 42a, it is a little more than in the case of the first embodiment. It is recommended to inject the resin at a high pressure.

  In the modification, the protrusion 71 is positioned at the center in the left-right direction on the upper surface of the vertical hinge connecting portions 22c, 32c, and 42c. However, instead of this, the protrusion 71 may be positioned at a position shifted from the center in the left-right direction on the upper surface of the vertical hinge connecting portions 22c, 32c, 42c to the left or right. In this case, the flow of the resin into the white keys 21 and 31 and the black key 41 at the time of injecting the resin is slightly worse than in the case of the modified example. Therefore, it is better to inject the resin at a slightly higher pressure than in the modification.

b. Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 9A is an enlarged plan view showing the vicinity of the vertical hinge region 22 of the first key unit 20 according to the second embodiment, and FIG. 9B is an enlarged view showing the vicinity of the vertical hinge region 22. It is a side view.

  In the second embodiment, square protrusions (dejima parts) 72 are respectively provided at the upper ends of the rear surfaces of the plurality of vertical hinge connecting parts 22a, and the protrusions 26 are replaced with the protrusions 26 on the upper surfaces of the protrusions 72. A protrusion 73 having the same shape as that of the protrusion 26 is integrally formed. The lateral side surface on the outer side in the left-right direction of the protrusion 72 is located at the same position as or the inner side of the outer end in the left-right direction of the vertical hinge connecting portion 22a. The side surface on the inner side in the left-right direction of the protrusion 72 is located farther from the outer end in the left-right direction of the vertical hinge 22b. The rear surface of the protruding portion 72 is located away from the front surface of the vertical hinge connecting portion 22c. Moreover, the upper end of the protrusion part 72 is located in the upper surface vicinity of the vertical hinge connection part 22a, and the lower end of the protrusion part 72 exists in a position higher than the lower surface of the vertical hinge connection part 22a. The vertical length of the protruding portion 72 is substantially the same as the vertical length of the vertical hinge connecting portion 22a, and the upper end of the protruding portion 72 is set to the same height as the upper surface of the vertical hinge connecting portion 22a. It is good also considering the lower end of as a position a little higher than the lower surface of the vertical hinge connection part 22a, or the same height position as a lower surface. Also in these cases, the upper end of the protrusion 73 is lower than the upper surface of the white key 21. Also in this case, since the other configuration of the keyboard device is the same as that of the first embodiment, the description thereof is omitted.

  The lower ends of the plurality of holes 51 a provided in the upper mold 51 described above are aligned with the upper end positions of the plurality of protrusions 73. Also in this case, if the resin melted and heated by the injection device is injected into the space between the upper mold 51 and the lower mold 52 through the gate 61a, the first key of the above configuration is obtained. A unit 20 is configured. The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above.

  Also in the keyboard device thus molded with resin, the protrusion 72 and the protrusion 73 are portions that are located behind the rear ends of the white keys 21, 31 and the black key 41 and are covered by the upper cover. There is no problem with the appearance of the device. Further, the protrusion 72 and the protrusion 73 are located on the inner side of the left and right ends of the vertical hinge connecting portions 22a, 32a, and 42a having the same lateral width as the lateral width of the rear ends of the white keys 21, 31 and the black key 41. There is no problem of abnormal noise due to contact with the adjacent white keys 21, 31 and the black key 41, and vibration of the white keys 21, 31 and the black key 41. The keyboard device according to the second embodiment also has the same configuration as that of the keyboard device according to the first embodiment except for the resin injection position, so the configuration of the keyboard device, the first to third keys. An effect equivalent to the effect of the first embodiment described above at the time of assembling work of the units 20, 30, 40 and at the time of pressing and releasing the white keys 21, 31 and the black key 41 is expected.

  In the resin molding, resin is injected from the upper side to the lower side at a position corresponding to the protrusion 73. In this case, since the injected resin collides with the upper surface of the lower mold 52 at a position corresponding to the bottom surface of the projecting portion 72 and changes its direction in the lateral direction, resin jetting hardly occurs. Therefore, even if the injection pressure of the resin is increased to some extent, a linear pattern due to the flow of the resin is not formed on the resin-molded white keys 21, 31 and the black key 41, and the white keys 21, 31 are not formed. And the appearance of the black key 41 is improved. Further, since the injection pressure of the resin can be increased to some extent, the resin sufficiently flows into the front end portions of the white keys 21, 31 and the black key 41 through the vertical hinge connecting portions 22a, 32a, 42a, and the vertical hinge connecting portion 22a. , 32a, 42a, vertical hinges 22b, 32b, 42b, vertical hinge connecting portions 22c, 32c, 42c, horizontal hinges 23, 33, 43 and rail connecting portions 24, 34, 44 to rail portions 25, 35, 45. Respectively, the white keys 21, 31, the black key 41 and the rail portions 25, 35, 45 are molded well.

  Next, a modification of the second embodiment will be described with reference to the drawings. FIG. 10A is an enlarged plan view showing the vicinity of the vertical hinge region 22 of the first key unit 20 according to a modification of the second embodiment, and FIG. 10B is the vicinity of the vertical hinge region 22. FIG.

  In this modification, protrusions (dejima) 74 and protrusions 75 similar to the protrusions 72 and protrusions 73 of the second embodiment are provided on the plurality of vertical hinge connecting portions 22c side, respectively. Specifically, the protruding portion 74 is provided on the upper end portion of the front surface of the vertical hinge connecting portion 22 c, and the protrusion 75 is provided on the upper surface of each protruding portion 74. The lateral side surface of the protrusion 74 in the left-right direction is located at the same position as or the inside of the lateral end of the vertical hinge connecting portion 22c. The inner side surface of the protrusion 74 in the left-right direction is located farther than the outer end of the vertical hinge 22b in the left-right direction. The front surface of the protrusion 74 is positioned away from the rear surface of the vertical hinge connection portion 22a. Moreover, the upper end of the protrusion part 74 is located in the upper surface vicinity of the vertical hinge connection part 22c, and the lower end of the protrusion part 74 exists in a position higher than the lower surface of the vertical hinge connection part 22c. In this case, the vertical length of the protrusion 74 is substantially the same as the vertical length of the vertical hinge connecting portion 22c, and the upper end of the protrusion 74 is approximately the same height as the upper surface of the vertical hinge connecting portion 22c. The lower end of the protrusion 74 may be a little higher than the lower surface of the vertical hinge connecting portion 22c or the same height as the lower surface. Also in these cases, the upper end of the protrusion 75 is lower than the upper surface of the white key 21.

  And about the some hole 51a provided in the upper metal mold | die 51 mentioned above, the lower end is match | combined with the upper end position of the some protrusion 75. FIG. Also in this case, if the resin melted and heated by the injection device is injected into the space between the upper mold 51 and the lower mold 52 through the gate 61a, the first key of the above configuration is obtained. A unit 20 is configured. The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above.

  Also in the keyboard device thus resin-molded, the protrusion 74 and the protrusion 75 are located behind the rear ends of the white keys 21, 31 and the black key 41 and are covered with the upper cover. There is no problem with the appearance of the device. Further, the protrusion 74 and the protrusion 75 are located on the inner side of the left and right ends of the vertical hinge connecting portions 22a, 32a, and 42a having the same lateral width as that of the rear ends of the white keys 21, 31 and the black key 41. There is no problem of abnormal noise due to contact with the adjacent white keys 21, 31 and the black key 41, and vibration of the white keys 21, 31 and the black key 41.

  Further, in the resin molding, resin is injected from the upper side to the lower side at a position corresponding to the protrusion 75. Also in this case, since the injected resin collides with the upper surface of the lower mold 52 at a position corresponding to the bottom surface of the projecting portion 73 and changes its direction in the lateral direction, resin jetting hardly occurs. Therefore, even if the injection pressure of the resin is increased to some extent, a linear pattern due to the flow of the resin is not formed on the resin-molded white keys 21, 31 and the black key 41, and the white keys 21, 31 are not formed. And the appearance of the black key 41 is improved. Further, since the injection pressure of the resin can be increased to some extent, the resin is white key 21, 31 via the vertical hinge connecting portions 22c, 32c, 42c, the vertical hinges 22b, 32b, 42b and the vertical hinge connecting portions 22a, 32a, 42a. In addition, it sufficiently flows into the front end portion of the black key 41, and the receiving rail portions 25, 35, 45 through the vertical hinge connecting portions 22 c, 32 c, 42 c, the horizontal hinges 23, 33, 43 and the rail connecting portions 24, 34, 44. Therefore, the white keys 21 and 31, the black key 41, and the rail portions 25, 35, and 45 are molded well.

c. Third Embodiment Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 11A is a plan view of the first key unit 20 according to the third embodiment, FIG. 11B is a front view of the first key unit, and FIG. 11C is a view of the first key unit. It is a side view. FIG. 12A is an enlarged plan view showing the vicinity of the lateral hinge region of the first key unit, and FIG. 12B is an enlarged side view showing the vicinity of the lateral hinge region 22.

  In the third embodiment, the vertical hinge region 22 including the vertical hinge connecting portion 22a, the vertical hinge 22b, and the vertical hinge connecting portion 22c in the first embodiment is eliminated, and the horizontal hinge 23 is changed to the horizontal hinge region 28. It is. The horizontal hinge region 28 includes a horizontal hinge connection portion 28a similar to the vertical hinge connection portion 22a of the first embodiment and a horizontal hinge 28b similar to the horizontal hinge 23 of the first embodiment. And the protrusion 76 similar to the protrusion 26 of the said 1st Embodiment is provided in the center of the left-right direction in the upper surface of the horizontal hinge connection part 28a. In this case as well, the protrusion 76 is not the center in the left-right direction on the upper surface of the horizontal hinge connecting portion 28a, but the center in the left-right direction on the upper surface of the horizontal hinge connecting portion 28a as long as it is within the horizontal width of the horizontal hinge connecting portion 28a. May be shifted to the left or right side.

  The lower ends of the plurality of holes 51 a provided in the upper mold 51 described above are aligned with the upper end positions of the plurality of protrusions 76. Also in this case, if the resin melted and heated by the injection device is injected into the space between the upper mold 51 and the lower mold 52 through the gate 61a, the first key of the above configuration is obtained. A unit 20 is configured. The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above.

  Also in the keyboard device thus resin-molded, the protrusion 76 is a portion that is positioned behind the rear ends of the white keys 21 and 31 and the black key 41 and is covered by the upper cover. There is no problem. Further, since the protrusion 76 is located inside the left and right ends of the horizontal hinge connecting portion 28a whose lateral width is the same as the lateral width of the rear ends of the white keys 21 and 31 and the black key 41, the adjacent white keys 21 and 31 are adjacent to each other. Further, there is no problem of generation of abnormal sound due to contact with the black key 41, and vibration of the white keys 21, 31 and the black key 41. The keyboard device according to the third embodiment also has the same configuration as the keyboard device according to the first embodiment except that the vertical hinge region 22 is eliminated and the resin injection position is changed. An effect equivalent to that of the first embodiment described above at the time of pressing and releasing the white key 21, 31 and the black key 41 is expected.

  Further, in the resin molding, resin is injected from a position corresponding to the protrusion 76. In this case, the vertical hinges 22b, 32b, and 42b do not exist as in the case of the first embodiment. Therefore, even when the injection pressure of the resin by the injection device is not so high, the resin flows into the rail portions 25, 35, 45 through the lateral hinge 28 b and the rail connection portions 24, 34, 44, respectively. 35 and 45 are molded well. Further, the position corresponding to the protrusion 76 which is the resin injection position is on the upper surface of the lateral hinge connecting portion 28a and is located in the vicinity of the rear ends of the white keys 21, 31 and the black key 41. 31 and the black key 41 can easily flow to the front ends, and the white keys 21, 31 and the black key 41 are molded well.

  Next, a modification of the third embodiment will be described with reference to the drawings. FIG. 13A is an enlarged plan view showing the vicinity of the horizontal hinge region 28 of the first key unit 20 according to a modification of the third embodiment, and FIG. 13B is the vicinity of the horizontal hinge region 28. It is an enlarged side view which shows a part.

  In this modification, a horizontal hinge connection portion 28c similar to the horizontal hinge connection portion 28a is provided between the horizontal hinge 28b and the rail connection portion 24 of the third embodiment. That is, the lateral hinge region 28 is configured by the lateral hinge coupling portion 28a, the lateral hinge 28b, and the lateral hinge coupling portion 28c. A protrusion 77 similar to the protrusion 76 is provided at the center in the left-right direction on the upper surface of the horizontal hinge connecting portion 28c. In this case as well, the protrusion 77 is not the center in the left-right direction on the upper surface of the horizontal hinge connecting portion 28c, but the center in the left-right direction on the upper surface of the horizontal hinge connecting portion 28c as long as it is within the horizontal width of the horizontal hinge connecting portion 28c. May be shifted to the left or right side.

  The lower ends of the plurality of holes 51 a provided in the upper mold 51 are aligned with the upper end positions of the plurality of protrusions 77. Also in this case, if the resin melted and heated by the injection device is injected into the space between the upper mold 51 and the lower mold 52 through the gate 61a, the first key of the above configuration is obtained. A unit 20 is configured. The second and third key units 30 and 40 are also resin-molded in the same manner as the first key unit 20 described above.

  Also in the keyboard device molded in this way, the protrusion 77 is a portion which is located behind the rear ends of the white keys 21 and 31 and the black key 41 and is covered by the upper cover. There is no problem. Further, since the protrusion 77 is located on the inner side of the left and right ends of the horizontal hinge connecting portion 28c whose left and right lateral width is the same as that of the rear ends of the white keys 21 and 31 and the black key 41, the adjacent white keys 21 and 31 are adjacent to each other. Further, there is no problem of generation of abnormal sound due to contact with the black key 41 and vibration of the white keys 21 and 31 and the black key 41.

  Further, in the resin molding, resin is injected from a position corresponding to the protrusion 77. In this case, in the same manner as in the third embodiment, even when the injection pressure of the resin by the injection device is not so high, the resin passes through the rail connecting portions 24, 34, and 44, and the rail portions 25, Since it flows into 35 and 45, respectively, the rail parts 25, 35, and 45 are molded well. Further, in this case, the position corresponding to the protrusion 76 as the resin injection position is on the upper surface of the horizontal hinge connecting portion 28c, and the white keys 21, 31 and the black key 41 are provided via the horizontal hinge 28c and the horizontal hinge connecting portion 28a. Therefore, if the injection pressure of the resin is slightly higher than that of the third embodiment, the resin flows to the front ends of the white keys 21, 31 and the black key 41, and the white keys 21, 31 and the black key 41 are injected. Is also molded well.

d. Other Modifications The keyboard device according to the present invention is not limited to the first to third embodiments and various modifications thereof, and can be implemented with appropriate modifications.

  In the first to third embodiments and various modifications thereof, the vertical hinge connecting portions 22a, 32a, 42a, the vertical hinge connecting portions (lateral hinge connecting portions) 22c, 32c, 42c, and the horizontal hinges 23, 34, 44 are provided. The lateral widths of the rail connecting portions 24, 34, 44, the lateral hinge connecting portions 28a, 28c, and the lateral hinge 28b are made the same as the lateral widths of the rear ends of the white keys 21, 31 and the black key 41. However, instead of this, the vertical hinge connecting portions 22a, 32a, 42a, the vertical hinge connecting portions (lateral hinge connecting portions) 22c, 32c, 42c, the horizontal hinges 23, 34, 44, the rail connecting portions 24, 34, 44, If the hinge function and the connecting function of the horizontal hinge connecting portions 28a, 28c and the horizontal hinge 28b are exhibited, the vertical hinge connecting portions 22a, 32a, 42a, the vertical hinge connecting portions (lateral hinge connecting portions) 22c, 32c, 42c, The horizontal widths of all or part of the horizontal hinges 23, 34, 44, the rail connecting portions 24, 34, 44, the horizontal hinge connecting portions 28a, 28c, and the horizontal hinge 28b are set to the rear of the white keys 21, 31 and the black key 41. It may be smaller than the lateral width of the end. Further, since there are some gaps in the left-right direction between the rear ends of the adjacent white keys 21, 31 and the black key 41, the adjacent vertical hinge connecting portions 22a, 32a, 42a, vertical hinge connecting portions (horizontal hinge connecting portions) Part) 22c, 32c, 42c, horizontal hinges 23, 34, 44, rail connecting parts 24, 34, 44, horizontal hinge connecting parts 28a, 28c, and horizontal hinges 28b are not in contact with each other and do not overlap vertically. , Vertical hinge connecting portions 22a, 32a, 42a, vertical hinge connecting portions (horizontal hinge connecting portions) 22c, 32c, 42c, horizontal hinges 23, 34, 44, rail connecting portions 24, 34, 44, horizontal hinge connecting portions 28a, The lateral width of all or part of 28c and the lateral hinge 28b may be larger than the lateral width of the rear ends of the white keys 21, 31 and the black key 41. That is, in consideration of the first to third embodiments and the various modifications thereof and the modifications, the vertical hinge connecting portions 22a, 32a, 42a, the vertical hinge connecting portions (horizontal hinge connecting portions) 22c, 32c, 42c. , Horizontal hinges 23, 34, 44, rail connecting portions 24, 34, 44, horizontal hinge connecting portions 28a, 28c, and horizontal hinges 28b are all or part of the width in the left-right direction, and adjacent vertical hinge connecting portions 22a, 32a, 42a, vertical hinge connecting portions (horizontal hinge connecting portions) 22c, 32c, 42c, horizontal hinges 23, 34, 44, rail connecting portions 24, 34, 44, horizontal hinge connecting portions 28a, 28c, and horizontal hinges 28b. What is necessary is just to set each to the magnitude | size (for example, 1.1 times or less of the horizontal width of the rear end of the white key 21,31 and the black key 41) in which a clearance gap exists.

  In the first and second embodiments and various modifications thereof, the vertical hinge region 22 is provided in front of the horizontal hinge 23. However, the longitudinal relationship between the vertical hinge region 22 and the horizontal hinge 23 is reversed. The vertical hinge region 22 may be provided behind the horizontal hinge 23.

DESCRIPTION OF SYMBOLS 10 ... Key frame, 11 ... Lower step wall, 13 ... Upper step wall, 14 ... Frame side guide member, 20 ... 1st key unit, 21 ... White key, 22 ... Vertical hinge area | region, 22a, 22c ... Vertical hinge connection part, 22b ... Vertical hinge, 23 ... Horizontal hinge, 25 ... Rail part, 26 ... Protrusion, 27 ... Key side guide member, 28a, 28c ... Horizontal hinge connecting part, 28b ... Horizontal hinge, 30 ... Second key unit, 31 ... White key 32 ... Vertical hinge region, 32a, 32c ... Vertical hinge connecting portion, 32b ... Vertical hinge, 33 ... Horizontal hinge, 35 ... Rail portion, 36 ... Projection, 37 ... Key side guide member, 40 ... Third key unit, 41 ... Black key, 42 ... Vertical hinge region, 42a, 42c ... Vertical hinge connecting part, 42b ... Vertical hinge, 43 ... Horizontal hinge, 45 ... Rail part, 46 ... Protrusion, 47 ... Key side guide member, 51 ... Upper mold , 51a ... holes, 52 ... Mold, 61 ... runner member, 71,73,75,76,77 ... projection, 72, 74 ... projecting portion

Claims (4)

A plurality of keys extending in the front-rear direction and arranged in parallel in the left-right direction;
A long rail that extends in the left-right direction and is fixed to the key frame;
A plurality of flat hinges each provided between a rear end of the plurality of keys and the rail portion and having a flat plate surface;
In a key unit having a plurality of keys integrally molded by injecting resin into a mold,
Providing a plurality of connecting portions for connecting the rear ends of the plurality of keys and the rail portions via the plurality of lateral hinge portions, respectively;
The lateral widths of the plurality of horizontal hinge portions and the plurality of connecting portions are set to sizes such that there are gaps between the adjacent horizontal hinge portions and the connecting portions, respectively.
A key unit characterized in that, when the key unit is integrally molded by the mold, a predetermined portion located within the width in the left-right direction of the connecting portion is a gate corresponding portion for injecting resin. The key unit according to claim 1, further comprising:
A plurality of plate-like vertical hinge portions that are respectively provided in front of or behind the plurality of horizontal hinge portions between the rear ends of the plurality of keys and the rail portions, and have a plate surface made vertical;
The connecting portion is configured by a vertical hinge connecting portion provided in front of or behind the plurality of vertical hinge portions, respectively, and a predetermined portion located within a lateral width on the upper surface of the vertical hinge connecting portion, A key unit characterized in that it is the gate corresponding part. The key unit according to claim 1, further comprising:
A plurality of plate-like vertical hinge portions that are respectively provided in front of or behind the plurality of horizontal hinge portions between the rear ends of the plurality of keys and the rail portions, and have a plate surface made vertical;
The connecting portion is configured by a vertical hinge connecting portion provided in front of or behind the plurality of vertical hinge portions, respectively, and provided in a predetermined portion located in a rear side surface or a front side surface of the vertical hinge connecting portion. A key unit characterized in that the upper surface of the protruding portion is the gate corresponding portion. The key unit according to claim 1,
The connecting portion is configured by a horizontal hinge connecting portion provided in front of or behind the plurality of horizontal hinge portions, respectively, and a predetermined portion located within a lateral width on the upper surface of the horizontal hinge connecting portion, A key unit characterized in that it is the gate corresponding part.

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