JP2015081930A - Key guide structure of keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key guide structure of a keyboard instrument capable of stably guiding a key rotating in accordance with key touch without generating a noise and capable of reducing a manufacturing cost thereof.SOLUTION: A key guide structure of a keyboard instrument for guiding a key 3 that rotates in accordance with key touch has fitting parts each of which is opened upward and laterally penetrating, and includes: a plurality of key guide holders 51 erected on the lower side of a guide recess part for each key 3 in a keyboard chassis 2; and a plurality of key guide main bodies 52 each of which is made from a soft synthetic resin and formed in a plate-like shape having almost the same width as the lateral width inside the guide recess part of the key 3 and fitted in a state of being inserted from above into each fitting part of the plurality of key guide holders 51, and slides to the left and right inside surfaces of the guide recess parts of the plurality of keys 3, respectively.

Description

  The present invention is applied to a keyboard instrument such as an electronic piano, and relates to a key guide structure of a keyboard instrument for guiding a key that rotates when a key is pressed.

  As a conventional key guide structure for a keyboard instrument, for example, the one described in Patent Document 1 already filed by the present applicant is known. A keyboard apparatus for an electronic piano to which this key guide structure is applied is a state in which a plurality of keys extending in the front-rear direction and having an inverted U-shaped cross section composed of a top wall and left and right side walls, and these keys are arranged in the left-right direction And a keyboard chassis that rotatably supports each key at the rear end, and a key guide for guiding the rotating key is provided for each key in the keyboard chassis. In this keyboard device, both the key and the keyboard chassis are formed of a molded product made of a hard synthetic resin. Each key guide is erected on the lower side near the front end of the corresponding key, and is formed in a plate shape having substantially the same width as that between the left and right side walls of the key. Lubricant is applied.

  Moreover, what was described in patent document 2 as a key guide structure of the other conventional keyboard musical instrument is also known. This key guide is configured by attaching a rubber guide member to a guide member holding portion formed so as to protrude upward. The guide member is formed in a cylindrical shape, and is attached to the guide member holding portion in a state where the guide member is inserted inside.

  In the key guide structures of Patent Documents 1 and 2 as described above, in the key release state, the upper end portion of the key guide is engaged with the key guide slightly entering the inside of the key. When the key is pressed from this key release state, the key guide engages so as to penetrate deeply into the key, so that the key does not sway in the left-right direction, that is, while preventing the key from swinging. Guide the moving keys.

JP 2000-122654 A Japanese Patent Laid-Open No. 11-296162

  However, in Patent Document 1 described above, since both the key and the keyboard chassis are made of a hard synthetic resin, if the lubricant applied to the key guide is reduced due to the long-term use of the electronic piano, the key is pressed. Sometimes, noise may be generated by sliding sound caused by the inner surface of the key being rubbed against the key guide. Further, when too much lubricant is applied to the key guide, the lubricant may protrude outside the key. On the other hand, in patent document 2, since the guide member is formed in the cylinder shape which covers the circumference | surroundings of the guide member holding | maintenance part, the usage-amount of the material which comprises a guide member becomes comparatively large, Therefore The cost will become high. .

  The present invention has been made in order to solve the above-described problems, and can stably guide a key that rotates as a key is pressed without generating noise, and has a manufacturing cost. An object of the present invention is to provide a key guide structure for a keyboard instrument that can reduce the above.

  In order to achieve the above object, the invention according to claim 1 includes a plurality of guide recesses each extending in the front-rear direction, rotatably supported by the keyboard chassis at the rear end, and opened downward. A keyboard instrument key guide structure for guiding a key that rotates when a key is pressed, each having an attachment portion that opens upward and penetrates in the left-right direction. In the keyboard chassis, a plurality of key guide holders erected below the guide recess for each key, and each made of a soft synthetic resin and having a width dimension substantially the same as the lateral width in the key guide recess A plurality of key guide bodies that are formed in a plate shape and are respectively attached in a state of being inserted from above into the attachment portions of the plurality of key guide holders, and are in sliding contact with the left and right inner surfaces of the guide recesses of the plurality of keys, Characterized in that it comprises.

  According to this configuration, each of the plurality of keys extending in the front-rear direction has the guide recess that opens downward, and is supported by the keyboard chassis so as to be rotatable at the rear end. Further, in the keyboard chassis, a plurality of key guide holders having the predetermined mounting portions are erected on the lower side of the guide recesses for each key, and the key guide main body is attached to the mounting portions of the key guide holders. It is attached in a state inserted from above. Each key guide body is formed in a plate shape having a width that is substantially the same as the width in the left-right direction of the guide recess of the key, and is in sliding contact with the left and right inner surfaces of the guide recess. Therefore, when the key is depressed, the key is guided while sliding with respect to the left and right side surfaces of the key guide body while the key rotates around the rear end portion and the left and right inner surfaces of the guide recess. .

  In addition, since the key guide body is made of a soft synthetic resin, for example, the key is made of a hard synthetic resin, and even if the inner side surface of the guide recess of the key is rubbed against the key guide body, The sliding sound at that time can be greatly reduced, and thereby the key can be guided stably without generating noise. In addition, since the key guide body is formed in a plate shape, the amount of synthetic resin used as a material can be reduced compared to the conventional case where the guide member is formed in a cylindrical shape, thereby reducing the manufacturing cost. Can be planned.

  According to a second aspect of the present invention, in the key guide structure of the keyboard instrument according to the first aspect, the keys are separated from each other by a predetermined distance inwardly from the corresponding left and right side walls spaced apart from each other by a predetermined distance in the left and right direction. And the left and right guide walls respectively constituting the left and right side walls of the guide recess, provided at substantially the same distance as the lateral width of the key guide body in the left and right direction. .

  According to this configuration, in the key having the left and right side walls that are spaced apart from each other by a predetermined distance in the left and right direction, the left and right guide walls are provided at positions spaced apart from the corresponding side walls by a predetermined distance. Further, these guide walls are provided at substantially the same distance as the lateral width of the key guide body in the left-right direction, and constitute the left and right side walls of the guide recess in the key. Therefore, by providing each guide wall at a sufficient distance from the corresponding side wall, for example, even when a relatively large amount of lubricant such as grease is applied to the key guide body, the lubricant is not locked. It can be reliably prevented from protruding outside.

  The invention according to claim 3 is the key guide structure of the keyboard musical instrument according to claim 1 or 2, wherein grooves for retaining the lubricant are formed on the left and right side surfaces of the key guide body. And

  According to this configuration, when the lubricant is applied to the left and right side surfaces of the key guide body, a part of the lubricant enters the groove of the key guide body and is retained. As a result, the state in which the lubricant is held on the left and right side surfaces of the key guide body can be maintained over a long period of time, and the lubrication between the side surfaces of the key guide recess and the side surface of the key guide body during key pressing is possible. Sex can be secured.

  According to a fourth aspect of the present invention, in the key guide structure of the keyboard instrument according to any one of the first to third aspects, the key guide main body is attached to the lower end of the key guide main body when the key guide main body is attached to the attachment portion. The guide holder is provided with a retaining portion that engages in the retaining state.

  According to this configuration, in the state where the key guide body is attached by being inserted into the attachment portion of the key guide holder from above, the retaining portion at the lower end of the key guide body is engaged with the key guide holder in the retaining state. Match. As a result, the key guide body can be securely attached to the key guide holder, and the key guide body does not fall out of the key guide holder even when the guide recess of the key slides against the key guide body when the key is pressed.

  According to a fifth aspect of the present invention, in the key guide structure of the keyboard instrument according to the fourth aspect, the key guide holder is formed in a cylindrical shape extending in the vertical direction, has a holder main body having an attachment portion, and a front side of the holder main body. Further, at least one of the rear side includes a reinforcing portion standing on the keyboard chassis in a state of being connected to the holder main body.

  According to this structure, the holder main body which has an attaching part is formed in the cylinder shape extended in an up-down direction, and the key guide main body is attached to this holder main body. In addition, since the reinforcing portion is provided on at least one of the front side and the rear side of the holder body, the holder body can be firmly reinforced against the load in the front-rear direction by this reinforcing portion. The key guide body attached to the holder body can be firmly held.

  The invention according to claim 6 is the key guide for the keyboard musical instrument according to claim 5, wherein the reinforcing portion is formed in a cylindrical shape extending in the vertical direction.

  According to this configuration, since the reinforcing portion of the key guide holder is formed in a cylindrical shape extending in the up-down direction, the holder body can be firmly reinforced against a load in the left-right direction in addition to the front-rear direction. As a result, the key guide body attached to the holder body can be held more firmly.

It is a perspective view which shows the keyboard apparatus (1 octave part) of the electronic piano to which the key guide structure by one Embodiment of this invention is applied. (A) is a top view of the keyboard apparatus of FIG. 1, (b) is a figure when cut | disconnected by the bb line of (a). FIG. 2A is an exploded perspective view showing a keyboard chassis and a key of the keyboard device of FIG. 1, and FIG. 2B is an enlarged perspective view showing a part of a rear portion of the keyboard chassis. It is a perspective view which shows a white key and a black key. It is a figure which expands and shows the rear part of a key, (a) is a top view, (b) is a right view. It is a figure which shows a hammer, (a) is a perspective view which shows the external appearance of a hammer, (b) is a perspective view which shows the state which decomposed | disassembled the hammer main body and the weight. It is the perspective view and top view for explaining a white key guide part, the white key guide part on the left side is a state where the key guide body is attached to the key guide holder, and the white key guide part on the right side is the key guide body. The state removed from the key guide holder is shown. It is a figure which shows a key guide main body, (a) is a front view, (b) And (c) is sectional drawing when cut | disconnecting by the bb line and cc line of (a), respectively. It is sectional drawing when the white key guide part in FIG.7 (b) is cut | disconnected by the IX-IX line. It is a figure for demonstrating the relationship between a white key and a white key guide part, (a) shows the state when the front end part of a white key is cut | judged vertically and the front part of a white key is looked up from the downward direction. A perspective view and (b) are plan views showing the relationship between the white key and the white key guide part by cutting the upper part of the white key horizontally.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a keyboard device of an electronic piano to which a key guide structure according to an embodiment of the present invention is applied in a key release state. In both figures, only one octave is shown.

  As shown in FIGS. 1 and 2, the keyboard device 1 includes a keyboard chassis 2, a white key 3 a and a black key 3 b that are rotatably attached to the keyboard chassis 2, and is aligned in the left-right direction. A plurality of arranged keys 3, a plurality of hammers 4 rotatably attached to the keyboard chassis 2 for each key 3, a key switch 5 for detecting key press information of each key 3, and the like are provided. .

  The keyboard chassis 2 is formed of a resin molded product having a predetermined shape by injection molding a predetermined resin material (for example, ABS resin). As shown in FIG. 3A, in the keyboard chassis 2, the front part 11, the central part 12 and the rear part 13 are all formed so as to extend in the left-right direction as a whole, and these are appropriately spaced in the left-right direction. It is connected by a plurality of spaced ribs 14. In the following description, the front part 11, the central part 12 and the rear part 13 of the keyboard chassis 2 are referred to as “chassis front part 11”, “chassis central part 12” and “chassis rear part 13”, respectively.

  The chassis front part 11 guides the white key 3a. A plurality (seven in FIG. 3A) of white key guide portions 11a are inserted in the chassis front portion 11 for each white key 3a so as to be inserted from below and to prevent the white key 3a from sideways. It is installed. Further, the chassis front part 11 is provided with engagement holes 11b and 11b penetrating in the vertical direction on both the left and right sides of each white key guide part 11a, and the white key 3a is inserted into both engagement holes 11b and 11b. The left and right upper limit position restricting portions 21a and 21a, which will be described later, engage with each other in a penetrating state.

  The chassis central portion 12 guides the black key 3b. As in the case of the chassis front portion 11, a plurality of black keys 3 b are inserted into the chassis central portion 12 from below, and a plurality (five in FIG. 3 (a)) are provided to prevent the black keys 3 b from sideways. The black key guide portion 12a is erected. Further, a hammer support portion 15 that supports the hammer 4 is provided in front of the chassis central portion 12. The hammer support portion 15 has a plurality of support shafts 15a extending along a straight line extending in the left-right direction, and the hammer 4 is rotatably supported by these support shafts 15a.

  The key switch 5 is attached between the hammer support portion 15 and the chassis front portion 11. The key switch 5 includes a horizontally long printed circuit board 5a extending in the left-right direction and a plurality of switch bodies 5b including rubber switches attached to the printed circuit board 5a for each key 3.

  The chassis rear portion 13 supports the key 3 so as to be rotatable in the vertical direction at the rear end portion. As shown in FIG. 3 (b), the chassis rear portion 13 is provided with a plurality of partition walls 16 spaced apart from each other by a predetermined distance in the left-right direction so as to partition the adjacent keys 3, 3. And between the partition walls 16 and 16 which adjoin each other, the predetermined | prescribed key support part 17 which is formed symmetrically and supports the key 3 rotatably is provided. Specifically, the key support portion 17 is shown on the left and right lower support portions 18 and 18 for supporting left and right fulcrum shafts 24 and 24, which will be described later, of the key 3 from below (only the left side is shown in FIG. 3B). ) And a pair of left and right upper support portions 19 and 19 for supporting a portion from the upper surface to the rear surface at the rear end portion of the key 3 from above.

  The key 3 is formed in a hollow shape that extends a predetermined length in the front-rear direction and opens downward by injection molding a predetermined resin material (for example, AS resin). As shown in FIGS. 3 (a) and 4, a pair of left and right upper limit position restriction portions formed at the front end portion of the white key 3a so as to extend downward from the left and right side walls and bend its lower end portion forward. 21 (21a) is provided and engaged with the left and right engagement holes 11b and 11b of the chassis front portion 11 in a penetrating manner. Further, the white key 3a is in a state in which an actuator portion 22 (22a) protruding downward at a predetermined position behind the upper limit position restricting portion 21a is accommodated in an engagement recess 34 described later of the hammer 4. Is engaged. On the other hand, the black key 3b has an upper limit position restricting portion 21 (21b) and an actuator portion 22 (22b) having functions similar to those of the upper limit position restricting portion 21a and the actuator portion 22a of the white key 3a at the front end thereof. Yes.

  As shown in FIGS. 4 and 5, the rear portion of the key 3 has a rear main body 23 that is narrower in width than the front portion and extends in the front-rear direction. The left and right side surfaces of the rear body 23 are provided with fulcrum shafts 24 and 24 protruding outward (left and right) at predetermined positions near the rear end. Each fulcrum shaft 24 is formed so as to protrude upward from the center in the front-rear direction of the semicircular portion 24a, and a semicircular portion 24a having a circular arc surface in the lower half and a side shape formed in a semicircular shape. And a convex portion 24b. The semicircular portion 24a of each fulcrum shaft 24 is formed with a groove 24c on its peripheral surface, and when a lubricant such as grease is applied to the peripheral surface of the semicircular portion 24a, the grease is kept for a long time. Can be held over.

  A curved surface 25 having a predetermined curvature is formed at the rear end portion of the rear body 23 from the upper surface to the rear surface. The curved surface 25 is formed so that the side surface thereof is convexly curved along a concentric circle with the fulcrum shaft 24 of the key 3 as the center. Further, a taper portion 26 is provided at the rear end portion of the rear main body 23 so as to be continuous with the curved surface 25 and gradually reduce the lateral width in the left-right direction downward. The curved surface 25 is provided with a groove 25 a having the same function as the groove 24 c of the fulcrum shaft 24.

  As shown in FIG. 6, the hammer 4 includes a hammer body 31 and two weights 32 and 32 attached to the hammer body 31. The hammer body 31 is formed of a resin molded product having a predetermined shape by injection molding a predetermined resin material (for example, POM (polyacetal)). The hammer body 31 has a U-shaped bearing portion 33 that extends a predetermined length in the front-rear direction and has a side surface opened downward at a predetermined position closer to the front than the center in the front-rear direction. The bearing portion 33 is rotatably engaged with a support shaft 15 a of the hammer support portion 15 in the keyboard chassis 2. In addition, an engagement recess 34 that engages with the actuator portion 22 of the key 3 is provided in the front half of the hammer body 31 in front of the bearing portion 33. The engagement recess 34 is open upward and forward, and accommodates the lower portion of the actuator portion 22 with the lower end of the actuator portion 22 of the key 3 in contact with the bottom surface in the engagement recess 34. Further, a plurality of switch pressing portions 35 for pressing the switch body 5 b of the key switch 5 are provided in the front half of the hammer body 31 below the engaging recess 34.

  The weight attaching portion 36, which is the rear half of the hammer body 31, is provided with two front and rear engaging convex portions 37, 37 projecting outward at predetermined positions on the left and right side surfaces, and the rear engaging convex portion. An attachment hole 38 penetrating in the left-right direction is formed in the vicinity of 37. The notch 36a provided in the center of the weight mounting portion 36 is a hammer or the like that is used for fixing the keyboard device 1 on the shelf 10 (see FIG. 2) of the electronic piano in the key release state. This is to avoid hitting 4.

  The weight 32 is made of a material having a specific gravity greater than that of the hammer body 31 (for example, a metal such as iron), and is composed of two elongated plate-like weights. Each weight 32 is formed in a predetermined shape by, for example, pressing a long metal plate having a predetermined thickness and width. Specifically, each weight 32 has two engaging projections 37, 37, two attachment holes 38, two front and rear engagement holes 41, 41 corresponding to the notch 36a, the attachment holes 42, and A recess 43 is formed. The weights 32 and 32 are attached to the hammer body 31 by caulking the rivets 44 inserted into the attachment holes 42, 42 and 38 in a state where the weight attachment portions 36 of the hammer body 31 are sandwiched from both sides. It is fixed.

  One of the two weights of each hammer 4 (hereinafter referred to as “common weight 32A”) has a predetermined length and is common to all the hammers 4. The other weight (hereinafter referred to as “adjustment weight 32B”) is formed to have the same length as or shorter than the common weight 32A. Therefore, by adjusting the length of the adjustment weight 32B, the weight of the hammer 4 by the two weights 32A and 32B can be changed.

  In the keyboard device 1 configured as described above, when the key 3 is depressed in the key release state shown in FIGS. 1 and 2, the key 3 is centered on the left and right fulcrum shafts 24 and 24. Rotate downward. Along with this, the actuator portion 22 of the key 3 presses the engaging recess 34 of the hammer 4 downward. Thereby, the hammer 4 moves the switch body 5b corresponding to the key switch 5 upward by the switch pressing portion 35 while rotating counterclockwise in FIG. 2B about the support shaft 15a of the hammer support portion 15. Press from. In this case, the hammer 4 is prevented from further rotating by the rear end portion (rear end portion of the common weight 32A) coming into contact with the hammer stopper 13a of the chassis rear portion 13 from below. By the above key pressing operation, a predetermined touch weight corresponding to the weight and torque of the hammer 4 is given to the key 3 and key pressing information of the key 3 is detected via the key switch 5.

  On the other hand, when the key 3 that has been pressed is released, the hammer 4 is rotated in the opposite direction to that described above, and accordingly, the key 3 is pushed upward via the actuator unit 22 and thereby rotated upward. As a result, the key 3 and the hammer 4 return to the original key release state as shown in FIGS. In this case, the upper limit position restricting portion 21 at the front end of the key 3 abuts against a predetermined stopper 20 of the keyboard chassis 2 from below to prevent further rotation.

  Next, regarding the key guide structure according to the present invention, the configuration of the white key guide portion 11a of the chassis front portion 11 and the white key 3a guided thereby will be described in further detail with reference to FIGS. explain.

  FIG. 7 shows two white key guide portions 11a in the chassis front portion 11. The white key guide portion 11a (on the left side of FIGS. 7A and 7B) has a key guide body 52 to be described later. The white key guide portion 11a on the other side (the right side of FIGS. 4A and 4B) is in a state where the key guide main body 52 is removed. As shown in the figure, each white key guide portion 11 a includes a key guide holder 51 erected on the horizontal flat portion 11 c of the chassis front portion 11, and a key guide main body 52 attached to the key guide holder 51. It consists of

  The key guide holder 51 is configured integrally with the keyboard chassis 2, and has a cylindrical holder portion 53 (holder body) extending a predetermined length in the vertical direction, and a flat portion in a state of being connected to the front and rear of the holder portion 53. 11c, and reinforcing portions 54 and 55 provided upright on 11c. The holder portion 53 is provided with a slit-like attachment portion 53 a that is open upward and penetrates in the left-right direction and extends in the up-down direction. The key guide body 52 is attached to the attachment portion 53. Yes. In addition, the front and rear reinforcing portions 54 and 55 are each formed in a U shape whose planar shape opens to the holder portion 53 side. The rear reinforcing portion 55 is provided with auxiliary reinforcing portions 55a and 55a erected on the flat portion 11c in a state of being connected to the left and right side surfaces of the lower half portion.

  On the other hand, the key guide body 52 is made of a soft synthetic resin (for example, elastomer) and is formed in a vertically long plate shape. More specifically, as shown in FIG. 8, the key guide body 52 has a front rectangular shape formed in a vertically long rectangular shape, and upper and left and right side edges have predetermined thicknesses. The part is formed thicker than the other parts. Further, a groove 52 a extending along the circumferential direction is formed in the edge portion of the key guide main body 52. When a lubricant such as grease is applied to the edge portion of the key guide body 52, a part of the lubricant enters the groove 52a and is retained. Accordingly, the state in which the lubricant is held on the left and right side surfaces of the key guide main body 52 can be maintained for a long period of time, and the left and right guide walls 61 and 61 of the key 3 to be described later and the key guide main body when the key is pressed. The lubricity between the left and right side surfaces of 52 can be ensured.

  The key guide main body 52 is provided with an insertion portion 56 that extends in the vertical direction and is inserted into the holder portion 53 of the key guide holder 51 in the center on the front side. As shown in FIGS. 8A and 8B, the insertion portion 56 is formed to be relatively thick in the front-rear direction and so that the lateral width in the left-right direction gradually decreases downward. Further, a locking projection 57 (prevention part) protruding forward is formed at the lower end of the insertion part 56. The locking projection 57 has a substantially horizontal locking surface 57a and an inclined surface 57b inclined downward in the forward direction.

  In the key guide holder 51 and the key guide main body 52 configured as described above, the insertion portion 56 at the center of the key guide main body 52 is inserted into the attachment portion 53a of the holder portion 53 of the key guide holder 51 from above. In this state, the key guide body 52 is attached to the key guide holder 51. In this case, as shown in FIG. 7, the key guide main body 52 is attached with its upper and left and right edges protruding outward from the holder portion 53 of the key guide holder 51. In addition, as shown in FIG. 9, the locking projection 57 of the key guide body 52 is positioned below the holder portion 53 of the key guide holder 51, and the locking surface 57a of the locking projection 57 is the holder. Locked to the lower end of the portion 53. Thereby, the key guide main body 52 is firmly attached to the key guide holder 51 in a retaining state.

  FIG. 10 shows the front part of the white key 3a, where (a) shows its internal structure and (b) shows the relationship with the white key guide part 11a. As shown in the figure, left and right guide walls 61, 61 are provided at a front portion of the white key 3a and spaced apart from each other by a predetermined distance in the left-right direction. Each guide wall 61 extends a predetermined length in the vertical direction, hangs down from the top wall 60a of the white key 3a, and passes through the spacer 62 that protrudes inward from the corresponding side wall 60b of the white key 3a. It is configured integrally with the key 3a. The length between the left and right guide walls 61, 61 is set to be substantially the same as the horizontal width dimension of the key guide body 52 in the left-right direction, and the guide walls 61, 61 open downward. At the same time, a guide recess according to the present invention is configured in which the left and right side surfaces of the key guide body 52 are in sliding contact.

  When the white key 3a having the left and right guide walls 61, 61 configured as described above is depressed, the white key 3a that rotates about the fulcrum shaft 24 at the rear end portion has both guide walls 61, 61 as white keys. While sliding with respect to the left and right side surfaces of the key guide main body 52 of the guide portion 11a, the guide portion 11a is smoothly guided without shaking.

  Although not described in detail, the black key guide portion 12a for guiding the black key 3b has the same key guide body as the key guide body 52 of the white key guide portion 11a, and the key guide. The main body is in direct sliding contact with the left and right side walls of the black key 3b.

  As described above in detail, according to the present embodiment, the key guide main body 52 for guiding the rotating key 3 is made of a soft synthetic resin, so that the guide wall 61 of the key 3 and the like are the key guide main body. Even if it is rubbed by 52, the sliding sound at that time can be greatly reduced, and thereby the key 3 can be stably guided without generating noise. Further, since the key guide body 52 is formed in a plate shape, the amount of synthetic resin used as a material can be reduced compared to the conventional case where the guide member is formed in a cylindrical shape, thereby reducing the manufacturing cost. Can be achieved.

  Further, in the white key 3b, the left and right guide walls 61, 61 that are inwardly separated from the left and right side walls 60b, 60b and the key guide body 52 of the white key guide portion 11a are in sliding contact with each other. Even when a relatively large amount of lubricant is applied to the left and right side surfaces, the lubricant can be reliably prevented from protruding outside the white key 3b (side wall 60b).

  Further, in the key guide holder 51, the reinforcing portions 54 and 55 are provided before and after the holder portion 53 to which the key guide main body 52 is attached. As a result, the key guide main body 52 attached to the holder portion 53 can be firmly held.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, in the key guide holder 51, the holder portion 53 to which the key guide main body 52 is attached is formed in a cylindrical shape, and the rectangular tubular reinforcing portions 54 and 55 are provided on the front and rear sides thereof. Can be formed into a cylindrical shape other than the cylindrical shape (for example, a rectangular tube shape), and one reinforcing portion of the two reinforcing portions 54 and 55 can be omitted or the shape of the reinforcing portion can be changed to another shape. (For example, it may be cylindrical or plate-like).

  Further, the detailed configuration of the key guide holder 51, the key guide main body 52, and the key 3 constituting the key guide structure of the present invention shown in the embodiment, the material constituting them, and the like are merely examples, and It can be changed as appropriate within the scope of the gist.

DESCRIPTION OF SYMBOLS 1 Keyboard apparatus 2 Keyboard chassis 3 Key 3a White key 3b Black key 11a White key guide part 12a Black key guide part 51 Key guide holder 52 Key guide main body 52a Groove 53 Holder part (holder main body)
53a Attaching part 54 Reinforcing part 55 Reinforcing part 57 Locking convex part (preventing part)
60a White key top wall 60b White key left and right side walls 61 Guide wall

Claims (6)

Each of the keyboard instruments includes a plurality of keys extending in the front-rear direction and rotatably supported by the keyboard chassis at the rear end portion and having guide recesses that are opened downward. A keyboard instrument key guide structure for guiding the key,
A plurality of key guide holders, each having an attachment portion that opens upward and penetrates in the left-right direction, and is erected on the lower side of the guide recess for each key in the keyboard chassis;
Each is made of a soft synthetic resin and is formed in a plate shape having a width that is substantially the same as the width in the left-right direction in the guide recess of the key, and is inserted into the mounting portions of the plurality of key guide holders from above. A plurality of key guide bodies that are respectively attached in a state and are in sliding contact with left and right inner surfaces of the guide recesses of the plurality of keys,
A keyboard instrument key guide structure characterized by comprising: The key is
Left and right side walls spaced apart from each other by a predetermined distance;
The left and right sides of the guide recess are provided at predetermined positions inwardly from the corresponding side walls and spaced apart from each other by substantially the same width as the lateral width of the key guide body. A guide wall,
The key guide structure for a keyboard instrument according to claim 1, wherein   The key guide structure for a keyboard instrument according to claim 1 or 2, wherein grooves for retaining the lubricant are formed on the left and right side surfaces of the key guide body.   The lower end portion of the key guide body is provided with a retaining portion that engages with the key guide holder in a retaining state when the key guide body is attached to the mounting portion. A key guide structure for a keyboard instrument according to any one of claims 1 to 3. The key guide holder is
A holder body formed in a cylindrical shape extending in the vertical direction and having the mounting portion;
At least one of the front side and the rear side of the holder main body, a reinforcing portion erected on the keyboard chassis in a state connected to the holder main body,
5. A key guide structure for a keyboard instrument according to any one of claims 1 to 4, characterized by comprising:   6. The key guide structure for a keyboard instrument according to claim 5, wherein the reinforcing portion is formed in a cylindrical shape extending in the vertical direction.

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