JP2011221336A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard device that can produce key touch sensation resembling that of an acoustic piano, with high productivity at a low cost.SOLUTION: A plastic key 2 vertically rotatably connected onto a keyboard chassis 1 and hammer parts 18 and 19 for providing the key 2 with an action load when the key 2 is pressed are integrally formed with resin hinges 20 and 26, which serve as bendable connection parts. Accordingly, there is no need to separately form the key 2 and the hammer parts 18 and 19 for providing the key 2 with an action load, and therefore the key 2 and the hammer parts 18 and 19 can be formed at a time. Further, the hammer parts 18 and 19 can be assembled onto the keyboard chassis 1 at a time.

Description

  The present invention relates to a keyboard device such as an electronic piano or an electronic organ.

  Conventionally, in a keyboard device, as described in Patent Document 1, in order to obtain a key touch feeling similar to an acoustic piano, a key is mounted on a keyboard chassis so as to be rotatable in the vertical direction, A configuration in which a hammer member that applies an action load to a key according to a key pressing operation is attached so as to be rotatable in the vertical direction is known.

Japanese Patent Laid-Open No. 05-108059

  However, in such a conventional keyboard device, since the key and the hammer member are formed separately, it is necessary to manufacture the key and the hammer member separately, which not only increases the manufacturing cost, Since the hammer members must be individually assembled to the keyboard chassis, there is a problem that the assembling work is complicated and troublesome, and the productivity is poor.

  The problem to be solved by the present invention is to provide a keyboard device capable of obtaining a key touch feeling similar to an acoustic piano with good productivity and low cost.

In order to solve the above problems, the present invention includes the following components.
According to a first aspect of the present invention, there is provided a keyboard device in which a synthetic resin key is mounted on a keyboard chassis so as to be freely rotatable in the vertical direction, and the key is pressed by a bendable connecting portion. A keyboard device characterized by integrally forming a hammer portion for applying an action load to the key.

  The invention according to claim 2 is the keyboard device according to claim 1, wherein the connecting portion is a resin hinge made of the same synthetic resin as the key and the hammer portion.

  According to a third aspect of the present invention, a support shaft, which is a rotation center of the hammer portion, is integrally formed between the hammer portion and the connecting portion. It is a keyboard apparatus as described in above.

  According to a fourth aspect of the present invention, the keyboard chassis is provided with a hammer support portion that rotatably supports the support shaft that is the rotation center of the hammer portion. It is a keyboard device.

  According to the present invention, it is possible to form the key and the hammer portion at a time without having to separately form the hammer portion and the key for applying an action load to the key, and the key and the hammer portion can be formed on the keyboard. Can be assembled to the chassis at once. For this reason, it is possible to obtain a key touch feeling similar to that of an acoustic piano with good productivity and low cost.

It is the figure which showed the cross section of the location of a white key in one Embodiment of the keyboard apparatus to which this invention is applied. FIG. 2 is a diagram showing a cross-section of a black key in the keyboard device shown in FIG. 1. It is the perspective view which showed the state at the time of shape | molding the white key and hammer part in the keyboard apparatus shown by FIG. It is the expanded sectional view which showed the principal part in the AA arrow between the white key shown in FIG. 3, and a hammer part. It is the perspective view which showed the state at the time of shape | molding the black key and hammer part in the keyboard apparatus shown by FIG. FIG. 6 is an enlarged cross-sectional view showing a main part as viewed in the direction of arrows BB between the black key and the hammer part shown in FIG. 5. FIG. 2 is a cross-sectional view showing a state where a white key is pressed by the keyboard device shown in FIG. 1. FIG. 3 is a cross-sectional view showing a state in which a black key is pressed in the keyboard device shown in FIG. 2. It is the top view which showed the modification of the key to which this invention is applied.

Hereinafter, an embodiment of a keyboard apparatus to which the present invention is applied will be described with reference to FIGS.
As shown in FIG. 1 and FIG. 2, the keyboard device includes a synthetic resin keyboard chassis 1, a plurality of keys 2 arranged on the keyboard chassis 1 and mounted rotatably in the vertical direction. A switch portion 3 that outputs an ON signal in response to a key pressing operation of a plurality of keys 2, and an upper case 4 that is provided at the rear end portion of the keyboard chassis 1 and covers the upper side of the rear end portion of the key 2. Yes.

  As shown in FIGS. 1 and 2, the keyboard chassis 1 constitutes a lower case of the instrument body, and a front leg portion 5 protrudes upward from the bottom portion at the front end portion (right end portion in FIG. 1). Is formed. A front cover portion 6 corresponding to the front end surface of the key 2 is formed at the front end portion (right end portion in FIG. 1) of the front leg portion 5 so as to protrude further upward toward the front portion (upper right side in FIG. 1). .

  In addition, a substrate mounting portion 7 is formed at a slightly lower height than the front cover portion 6 as shown in FIGS. 1 and 2 at a substantially intermediate portion in the front-rear direction (left-right direction in FIG. 1) of the keyboard chassis 1. Has been. The switch unit 3 is attached to the upper surface of the substrate platform 7. In this case, a rising portion 8 is formed at the front end portion (right end portion in FIG. 1) of the substrate mounting portion 7, and a hammer portion 19 of a black key 16 to be described later is formed in the rising portion 8 in the vertical direction. An opening 8a for inserting a hammer to be inserted is formed.

  Further, on the rear part of the keyboard chassis 1, that is, on the rear side (left side in FIG. 1) of the board mounting part 7, the key mounting part 9 is substantially the same as the front cover part 6 as shown in FIGS. It is formed at a height. On the upper surface of the key placement portion 9, key support portions 10 are formed corresponding to the plurality of keys 2, respectively. The key support portion 10 is provided with a support shaft 10a that supports the rear end portion (left end portion in FIG. 1) of the key 2 so as to be rotatable in the vertical direction.

  Further, as shown in FIGS. 1 and 2, a rear leg portion 11 that supports the rear end portion of the keyboard chassis 1 is provided at the rear end portion (left end portion in FIG. 1) of the key chassis 1 of the keyboard chassis 1. The keyboard chassis 1 is suspended from the top to the bottom. Note that the upper case 4 is attached to the rear end portion of the rear leg portion 11 so as to cover the rear end portion side of the keyboard chassis 1 and the rear end portion side of the key 2. Inside the upper case 4 is provided a speaker 12 for emitting musical sounds. A bottom plate 13 is provided at the bottom of the keyboard chassis 1.

  On the other hand, the key 2 has a white key 15 and a black key 16 as shown in FIGS. As shown in FIG. 1, the white key 15 has a rear end portion (left end portion in FIG. 1) rotated in the vertical direction by a support shaft 10a on a key support portion 10 provided on the key placement portion 9 of the keyboard chassis 1. It is attached as possible. A switch pressing portion 15a for pressing the switch portion 3 mounted on the board mounting portion 7 of the keyboard chassis 1 is located on the lower side of the white key 15 in a substantially middle portion in the front-rear direction (left-right direction in FIG. 1). Is formed to protrude.

  Similarly, as shown in FIG. 2, the black key 16 has a rear end portion (left end portion in FIG. 2) vertically moved by a support shaft 10a to a key support portion 10 provided on the key placement portion 9 of the keyboard chassis 1. It is mounted so that it can rotate in any direction. As in the case of the white key 15, a switch for pressing the switch unit 3 mounted on the board mounting unit 7 of the keyboard chassis 1 is provided at a substantially middle portion of the black key 16 in the front-rear direction (left-right direction in FIG. A pressing portion 16a is formed to protrude downward.

  In this case, as shown in FIGS. 1 and 2, the switch unit 3 includes a rubber sheet 17 disposed on the switch substrate 14, and a dome-shaped bulge portion 17 a is provided on each rubber sheet 17. It is the structure formed corresponding to the press parts 15a and 16a, respectively. When the bulging portion 17a of the rubber sheet 17 is pressed by the switch pressing portions 15a and 16a of each key 2, the switch portion 3 is elastically deformed as shown in FIGS. Then, the movable contact inside thereof is configured to contact a fixed contact (none of which is shown) of the switch substrate 14 and output an ON signal.

  By the way, as shown in FIGS. 1 and 2, hammer portions 18 and 19 are integrally formed with the white key 15 and the black key 16, which are the plurality of keys 2, respectively. That is, as shown in FIGS. 1 and 3, the white key 15 is integrally formed with a hammer portion 18 via a resin hinge 20 that is a connecting portion that can be bent at the lower end of the tip (lower right end in FIG. 1). ing. In this case, as shown in FIG. 3 and FIG. 4, the hammer portion 18 is formed in a substantially triangular plate shape and has a function as a weight.

  Further, as shown in FIG. 3, the resin hinge 20 has a thin plate shape and protrudes from the lower end of the white key 15 toward the front side (right side in FIG. 3) when the white key 15 is formed. Is formed. As shown in FIGS. 3 and 4, a support shaft 21 serving as a rotation center of the hammer portion 18 is integrally formed between the resin hinge 20 of the white key 15 and the hammer portion 18. As shown in FIGS. 3 and 4, the support shaft 21 is formed in a round bar shape thicker than the thickness of the resin hinge 20, and a pair of shaft protrusions 21 a project from both side edges of the resin hinge 20 on both sides of the round bar shape. Is formed.

  As shown by a two-dot chain line in FIGS. 1 and 4, the support shaft 21 is provided in the keyboard chassis 1 with the hammer portion 18 folded back toward the lower side of the white key 15 around the resin hinge 20. The white key support rib 22 is rotatably supported. As shown in FIG. 1, the support rib 22 is formed from the bottom to the top along the front leg portion 5 of the keyboard chassis 1 corresponding to the lower end of the white key 15 (lower right end in FIG. 1). The upper end portion is formed in a state protruding above the front leg portion 5.

  As shown by a two-dot chain line in FIGS. 1 and 4, the upper end portion of the support rib 22 has a support shaft in a state where the hammer portion 18 is folded back toward the lower side of the white key 15 around the resin hinge 20. A pair of shaft projections 21a is formed with a bearing groove 22a that is inserted from above and held rotatably. A lubricant (not shown) such as silicone grease is applied in the bearing groove 22a in order to smoothly rotate the support shaft 21.

  Further, as shown in FIG. 1, a lower limit stopper 23 is provided on the bottom plate 13 of the keyboard chassis 1. The lower limit stopper 23 contacts the lower surface of the hammer portion 18 when the white key 15 is not depressed. . Further, as shown in FIG. 6, when the white key 15 is pressed and the hammer portion 18 rotates clockwise about the support shaft 21, the lower surface inside the white key 15 has a hammer portion 18. An upper limit stopper 24 with which the upper surface abuts is provided. Each of the lower limit stopper 23 and the upper limit stopper 24 has a cushioning property, and is configured to prevent the generation of abnormal noise such as noise when the hammer portion 18 abuts.

  The white key 15, the hammer portion 18, the resin hinge 20, and the support shaft 21 are made of a synthetic resin having bending resistance such as polypropylene (PP), and as shown in FIG. It is molded by a mold (not shown). That is, when manufacturing the white key 15, the hammer portion 18, the resin hinge 20, and the support shaft 21, the hammer portion 18 is positioned on the front side (right side in FIG. 3) of the white key 15, as shown in FIG. In this state, a molding die for the white key is formed so that the lower end of the white key 15 (lower right end in FIG. 3) and the hammer portion 18 are connected by the resin hinge 20 and the support shaft 21.

  In this case, the mold for white key is composed of a lower mold and an upper mold, and as shown by a two-dot chain line in FIG. It is formed so as to be located on a straight line passing through the center. In addition, when the white key 15, the hammer portion 18, the resin hinge 20, and the support shaft 21 are formed integrally with the molding die, the resin hinge 20 is bent after the resin hinge 20 is bent a plurality of times immediately after the molding. By processing, in addition to flexibility, durability and toughness are ensured.

  On the other hand, as shown in FIGS. 1 and 2, the black key 16 has a length in the front-rear direction shorter than that of the white key 15. As shown in FIGS. 2 and 5, the black key 16 has a hammer portion 19 integrally formed through a resin hinge 26 which is a connecting portion that can be bent at the lower end of the tip (lower right end in FIG. 2). Yes.

  In this case, as shown in FIG. 5, the hammer portion 19 is formed in a substantially triangular plate shape and has a function as a weight, like the white key 15. As shown in FIG. 2, a part of the hammer portion 19 located on the rear side (left side in FIG. 2) can move vertically in the opening 8 a of the rising portion 8 provided in the keyboard chassis 1. Is arranged.

  Further, as shown in FIG. 5, the resin hinge 26 has a thin plate shape and protrudes from the lower end of the black key 16 toward the front side (right side in FIG. 5) when the black key 16 is formed. Is formed. As shown in FIGS. 5 and 6, a support shaft 27 serving as a rotation center of the hammer portion 19 is integrally formed between the resin hinge 26 of the black key 16 and the hammer portion 19. As shown in FIGS. 5 and 6, the support shaft 27 is formed in a round bar shape thicker than the thickness of the resin hinge 26, and a pair of shaft protrusions 28 a protrude from both side edges of the resin hinge 26 on both sides of the round bar shape. Is formed.

  2 and 6, the support shaft 27 is provided on the keyboard chassis 1 with the hammer portion 19 folded back toward the lower side of the black key 16 around the resin hinge 26. The black key support rib 28 is rotatably supported. As shown in FIG. 2, the support rib 28 is located on the front side (right side in FIG. 2) of the rising portion 8 of the keyboard chassis 1 corresponding to the lower end of the black key 16 (lower right end in FIG. 2). It is formed upright from the bottom to the top.

  As shown by a two-dot chain line in FIGS. 2 and 6, the support rib 28 has a support shaft in a state in which the hammer portion 19 is folded back toward the lower side of the black key 16 around the resin hinge 26. A pair of shaft projections 28a is formed with bearing grooves 28a that are inserted from above and held rotatably. In the bearing groove 28a, a lubricant (not shown) such as silicone grease is applied in the same manner as the bearing groove 22a of the white key 15 in order to smoothly rotate the support shaft 27.

  Further, as shown in FIG. 2, a lower limit stopper 30 is provided on the bottom plate 13 of the keyboard chassis 1 so that the lower surface of the hammer portion 19 abuts when the black key 16 is not depressed. . Further, as shown in FIG. 7, when the black key 16 is pressed and the hammer portion 19 rotates clockwise around the support shaft 27 as shown in FIG. An upper limit stopper 31 with which the upper surface of the hammer portion 19 abuts is provided. The lower limit stopper 30 and the upper limit stopper 31 also have cushioning properties, and are configured to prevent the generation of abnormal noise such as noise when the hammer portion 19 comes into contact therewith.

  The black key 16, the hammer portion 19, the resin hinge 26, and the support shaft 27 are made of a synthetic resin having flexibility such as polypropylene (PP), like the white key 15. It is molded by a mold (not shown). That is, when the black key 16, the hammer portion 19, the resin hinge 26, and the support shaft 27 are manufactured, the hammer portion 19 is positioned on the front side (right side in FIG. 5) of the black key 16, as shown in FIG. In this state, a black key molding die is formed so that the lower end of the black key 16 (the lower right end in FIG. 5) and the hammer portion 19 are connected by the resin hinge 26 and the support shaft 27.

  In this case, the black key molding die is also composed of a lower die and an upper die, and as shown by the two-dot chain line in FIG. It is formed so as to be located on a straight line passing through the center. The resin hinge 26 is also formed by bending the resin hinge 26 a plurality of times immediately after the molding when the black key 16, the hammer portion 19, the resin hinge 26, and the support shaft 27 are integrally molded with a molding die. By processing, in addition to flexibility, durability and toughness are ensured.

Next, the case where each key 2 of the white key 15 and the black key 16 which are the keys 2 is assembled | attached to the keyboard chassis 1 is demonstrated.
First, when assembling the white key 15 to the keyboard chassis 1, as shown in FIG. 1, the hammer portion 18 is directed to the lower side of the white key 15 with the resin hinge 20 positioned at the lower end of the white key 15 as the center. Wrap. In this state, the pair of support protrusions 21a of the support shaft 21 provided between the white key 15 and the hammer portion 18 are inserted into the bearing groove portion 22a at the upper end portion of the support rib 22 provided on the keyboard chassis 1 from above. Let me. A lubricant such as silicone grease is applied to the bearing groove 22a in advance.

  Thereby, the hammer portion 18 is attached to the keyboard chassis 1 so as to be rotatable in the vertical direction around the support shaft 21. Thereafter, the rear end portion (left end portion in FIG. 1) of the white key 15 is rotatably attached to the key support portion 10 provided on the key placement portion 9 of the keyboard chassis 1 by the support shaft 10a. As a result, as shown in FIG. 1, the white key 15 is attached to the keyboard chassis 1 so as to be rotatable in the vertical direction, and the hammer portion 18 is attached to the keyboard chassis 1 so as to be rotatable in the vertical direction.

  When the black key 16 is assembled to the keyboard chassis 1, as shown in FIG. 2, the hammer portion 19 faces the lower side of the black key 16 around the resin hinge 26 located at the lower end of the black key 16. Wrap. In this state, the pair of support protrusions 28a of the support shaft 27 provided between the black key 16 and the hammer portion 19 are inserted into the bearing groove portion 28a at the upper end portion of the support rib 28 provided on the keyboard chassis 1 from above. Let

  At this time, as shown in FIG. 2, a part located on the rear side (left side in FIG. 2) of the hammer portion 19 can be moved vertically into the opening 8 a of the rising portion 8 provided in the keyboard chassis 1. Insert in the correct state. Also at this time, a lubricant such as silicone grease is applied to the bearing groove 28a in advance.

  Thereby, the hammer part 19 is attached to the keyboard chassis 1 so as to be rotatable in the vertical direction around the support shaft 27. Thereafter, the rear end portion (left end portion in FIG. 2) of the black key 16 is rotatably attached to the key support portion 10 provided on the key placement portion 9 of the keyboard chassis 1 by the support shaft 10a. As a result, as shown in FIG. 2, the black key 16 is attached to the keyboard chassis 1 so as to be rotatable in the vertical direction, and the hammer portion 19 is attached to the keyboard chassis 1 so as to be rotatable in the vertical direction.

Next, the operation of such a keyboard device will be described.
In this keyboard device, since the plurality of keys 2 include the white key 15 and the black key 16, the white key 15 will be described first. When the white key 15 is in an initial state in which no key is pressed, the support shaft 21 rotatably supported by the support rib 22 of the keyboard chassis 1 is rotated by its own weight as shown in FIG. The hammer portion 18 is in contact with a lower limit stopper 23 provided on the bottom plate 13 of the keyboard chassis 1.

  At this time, as shown in FIG. 1, the resin hinge 20 rotates counterclockwise around the support shaft 21 as the hammer portion 18 rotates, and pushes up the lower end of the tip of the white key 15. As a result, the white key 15 rotates counterclockwise around the support shaft 10a of the key support portion 10 provided on the key placement portion 9 of the keyboard chassis 1 and is restricted to the upper limit position. In this state, the switch pressing portion 15a of the white key 15 is located above the switch portion 3 and is separated.

  When the white key 15 is pressed in this state, as shown in FIG. 7, the white key 15 rotates clockwise around the support shaft 10a of the key support portion 10, and the lower end of the white key 15 is resin. The hinge 20 is pushed down. Thereby, the hammer portion 18 rotates counterclockwise around the support shaft 21 rotatably supported by the support rib 22 of the keyboard chassis 1 against its own weight, and applies an action load to the white key 15. . At this time, the support shaft 21 is smoothly rotated in the bearing groove portion 22a of the support rib 22 by a lubricant such as silicone grease.

  As the white key 15 is depressed, the hammer portion 18 rotates clockwise, and the upper surface of the hammer portion 18 contacts the upper limit stopper 24 provided inside the white key 15 as shown in FIG. The rotation of the hammer portion 18 in the clockwise direction is stopped. At this time, since the upper limit stopper 24 has a cushioning property, no abnormal noise such as noise is generated. At this time, the switch portion 3 is pressed by the switch pressing portion 15 a of the white key 15, and the bulging portion 17 a of the rubber sheet 17 is elastically deformed, so that the switch portion 3 outputs a switch signal and the speaker 12 Play a musical sound.

  Thereafter, the hammer portion 18 rotates counterclockwise about the support shaft 21 rotatably supported by the support rib 22 of the keyboard chassis 1 by its own weight, and the resin hinge 20 is supported by the support shaft 21 accordingly. Is rotated counterclockwise and the lower end of the white key 15 is pushed up. As a result, the white key 15 returns to the initial position as shown in FIG.

  On the other hand, the black key 16, like the white key 15, can rotate to the support rib 28 of the keyboard chassis 1 by its own weight as shown in FIG. 2 when the key is not depressed. The hammer portion 19 is in contact with a lower limit stopper 30 provided on the bottom plate 13 of the keyboard chassis 1.

  At this time, as shown in FIG. 2, the resin hinge 26 rotates counterclockwise around the support shaft 27 as the hammer portion 19 rotates to push up the lower end of the black key 16. Accordingly, the black key 16 is rotated counterclockwise around the support shaft 10a of the key support portion 10 provided on the key placement portion 9 of the keyboard chassis 1 and is restricted to the upper limit position. In this state, the switch pressing portion 16a of the black key 16 is located above the switch portion 3 and is separated.

  When the black key 16 is pressed in this state, as shown in FIG. 8, the black key 16 rotates clockwise around the support shaft 10a of the key support portion 10, and the lower end of the black key 16 is resin. The hinge 26 is pushed down. As a result, the hammer portion 19 rotates counterclockwise around the support shaft 27 rotatably supported by the support ribs 28 of the keyboard chassis 1 against its own weight, and applies an action load to the black key 16. Give. At this time, the support shaft 27 is smoothly rotated in the bearing groove portion 28a of the support rib 28 by a lubricant such as silicone grease.

  Then, as the black key 16 is depressed, the hammer portion 19 rotates clockwise, and the upper surface of the hammer portion 19 contacts the upper limit stopper 31 provided inside the black key 16 as shown in FIG. The rotation of the hammer portion 19 in the clockwise direction is stopped. At this time, since the upper limit stopper 31 has cushioning properties, no abnormal noise such as noise is generated. At this time, the switch portion 3 is pressed by the switch pressing portion 16a of the black key 16, and the bulging portion 17a of the rubber sheet 17 is elastically deformed, so that the switch portion 3 outputs a switch signal, and the speaker 12 Play a musical sound.

  Thereafter, the hammer portion 19 rotates counterclockwise around the support shaft 27 that is rotatably supported by the support rib 28 of the keyboard chassis 1 by its own weight. Is rotated counterclockwise and the lower end of the black key 16 is pushed up. As a result, the black key 16 returns to the initial position as shown in FIG.

  As described above, according to this keyboard device, the key is made of the synthetic resin key 2 mounted on the keyboard chassis 1 so as to be rotatable in the vertical direction via the resin hinges 20 and 26 which are bendable connecting portions. Since the hammer portions 18 and 19 for applying an action load to the key 2 in accordance with the key pressing operation 2 are integrally formed, it is not necessary to form the key 2 and the hammer portions 18 and 19 separately. The key 2 and the hammer portions 18 and 19 can be assembled to the keyboard chassis 1 at a time while being molded at a time. For this reason, it is possible to obtain a key touch feeling similar to that of an acoustic piano with good productivity and low cost.

  In this case, the synthetic resin key 2 has a white key 15 and a black key 16, and the white key 15 is acted on by the white key 15 via a resin hinge 20 that is a bendable connecting portion. Since the hammer portion 18 for applying a load is integrally formed, both the white key 15 and the hammer portion 18 can be formed at the same time without the need to form the white key 15 and the hammer portion 18 separately. Can be assembled to the keyboard chassis 1 at a time. For this reason, the productivity of the white key 15 is good and the cost can be reduced.

  Similarly, the black key 16 is integrally formed with a hammer portion 19 that applies an action load to the black key 16 via a resin hinge 26 that is a bendable connecting portion. 19 need not be formed separately, and both can be molded at the same time, and the black key 16 and the hammer portion 19 can be assembled to the keyboard chassis 1 at a time. For this reason, the productivity of the black key 16 is good and the cost can be reduced.

  Further, since the resin hinge 20 of the white key 15 is the same synthetic resin as the white key 15 and the hammer portion 18 thereof, the white key 15 and the hammer portion 18 are connected at once by the synthetic resin. be able to. That is, when the white key 15 is molded by a molding die, the lower end of the white key 15 and the hammer portion 18 are positioned with the hammer portion 18 positioned on the front side of the white key 15 as shown in FIG. Are connected by the resin hinge 20, the structure of the molding key for the white key is simple, the molding die can be easily manufactured, and the white key 15 and the hammer are formed by the molding die. The part 18 can be easily molded in a state where it is connected to the resin hinge 20.

  In this case, the resin hinge 20 of the white key 15 is a synthetic resin having bending resistance, such as polypropylene (PP). Therefore, when the white key 15 and the hammer portion 18 are molded with a molding die, the molding is performed. Immediately after that, by performing post-processing to bend the resin hinge 20 a plurality of times, durability and toughness can be ensured in addition to flexibility.

  When assembling the white key 15 formed in this way to the keyboard chassis 1, even if the hammer portion 18 is provided by folding the hammer portion 18 toward the lower side of the white key 15 around the resin hinge 20. The white key 15 can be compactly assembled to the keyboard chassis 1, thereby reducing the overall size of the keyboard device.

  Further, the resin hinge 26 of the black key 16 is also the same synthetic resin as the black key 16 and its hammer portion 19, so that the black key 16 and the hammer portion 19 are connected at once by this synthetic resin. be able to. That is, when the black key 16 is also molded with a molding die, the lower end of the black key 16 and the hammer are placed with the hammer portion 19 positioned on the front side of the black key 16 as shown in FIG. By connecting the portion 19 to the resin hinge 26, the structure of the black key molding die is simple, and the molding die can be easily manufactured. 16 and the hammer portion 19 can be easily molded with the resin hinge 26 connected.

  Also in this case, the resin hinge 26 of the black key 16 is a synthetic resin having bending resistance such as polypropylene (PP), so that when the black key 16 and the hammer portion 19 are molded with a molding die, Immediately after the molding, post-processing of bending the resin hinge 26 a plurality of times can provide durability and toughness in addition to flexibility.

  Even when the black key 16 formed in this way is assembled to the keyboard chassis 1, even if the hammer portion 19 is provided by folding the hammer portion 19 toward the lower side of the black key 16 around the resin hinge 26. Thus, the black key 16 can be compactly assembled to the keyboard chassis 1, and this also makes it possible to reduce the overall size of the keyboard device.

  Further, in this keyboard device, support shafts 21 and 27 that are the respective rotation centers of the hammer portions 18 and 19 are integrally formed between the hammer portions 18 and 19 and the resin hinges 20 and 26 that are connecting portions. As a result, the number of parts can be reduced, the assembly workability can be improved, and the white key 15 having the hammer portion 18 and the black key 16 having the hammer portion 19 can be used together with a molding die. Can be molded at once.

  That is, when the white key 15 having the hammer portion 18 is molded by a molding die, the molding die is divided into a lower die and an upper die, and a parting line PL that is a separation surface between the two die. By positioning the support shaft 21 at the center of the support shaft 21, even if the support shaft 21 is provided between the hammer portion 18 and the resin hinge 20, the structure of the molding die is simple. The support shaft 21 can be molded together with the white key 15 and the hammer portion 18 by a mold.

  Similarly, when the black key 16 having the hammer portion 19 is molded by a molding die, the molding die is divided into a lower die and an upper die, and a parting line that is a separation surface of the two dies. By positioning the PL at the center of the support shaft 27, the structure of the molding die is simple even if the support shaft 27 is provided between the hammer portion 19 and the resin hinge 26. The support shaft 27 can be molded together with the black key 16 and the hammer portion 19 by a mold.

  Further, in this keyboard apparatus, since the keyboard chassis 1 is provided with support ribs 22 and 29 which are hammer support portions for rotatably supporting the support shafts 21 and 28 which are the rotation centers of the hammer portions 18 and 19, The hammer portions 18 and 19 can be favorably supported by the support ribs 22 and 29 in a state in which the hammer portions 18 and 19 can rotate in the vertical direction.

  That is, the support shaft 21 which is the rotation center of the hammer portion 18 in the white key 15 is supported by the bearing groove portions 22a of the support ribs 22 provided on the keyboard chassis 1 so that the pair of shaft protrusions 21a can rotate freely. Even if the hammer portion 18 is formed integrally with the white key 15, the hammer portion 18 can be rotated smoothly and satisfactorily in the vertical direction.

  Similarly, the support shaft 27 which is the rotation center of the hammer portion 19 in the black key 16 has a pair of shaft protrusions 27a rotatably supported by bearing groove portions 28a of support ribs 28 provided on the keyboard chassis 1. Even if the hammer part 19 is formed integrally with the black key 16, the hammer part 19 can be rotated smoothly and satisfactorily in the vertical direction.

  In the above-described embodiment, the white key 15 and the black key 16 as the plurality of keys 2 are respectively rotated in the vertical direction by the support shaft 10a on the key support portion 10 formed on the key placement portion 9 of the keyboard chassis 1. Although the case where it was attached was described, it is not restricted to this, For example, like the modification shown in Drawing 9, a plurality of keys are arranged along the arrangement direction in the state arranged in the musical order. An integrally formed structure may be used.

  In this case, the plurality of keys are a plurality of white keys 35 as shown in FIG. Each rear end portion (the end portion located on the upper side in FIG. 9) of the plurality of white keys 35 is formed with a bent portion 36 formed of a thin portion that can be bent in the vertical direction. 36 is formed in a state where it is connected to a connecting portion 37 that is continuous along the arrangement direction of the white keys 35. The connecting portion 37 is configured to be attached to the key placement portion 9 of the keyboard chassis 1 by screws 37a.

  As in the above-described embodiment, the hammer portion 18 is formed integrally with each tip portion (the end portion on the lower side in FIG. 9) of the plurality of white keys 35 via the resin hinge 20. Also in this case, the support shaft 21 is formed between the hammer portion 18 and the resin hinge 20. The support shaft 21 is configured to be rotatably supported by support ribs 22 formed on the keyboard chassis 1.

  The plurality of white keys 35 configured as described above are arranged under the white keys 35 by rotating the hammer portions 18 around the resin hinges 20 as in the above-described embodiment. Each support shaft 21 is rotatably supported by each support rib 22 formed on the keyboard chassis 1, and in this state, the connecting portion 37 is attached to the key placement portion 9 of the keyboard chassis 1 by screws 37 a, so that a plurality of Since the white key 35 can be attached to the keyboard chassis 1 together with the plurality of hammer portions 18, the assembling work can be further improved. Such a configuration can be applied not only to the white key 35 but also to the black key.

  In the above-described embodiment, the case where the resin hinges 20 and 26 that are the connecting portions for connecting the key 2 and the hammer portions 18 and 19 are formed of the same synthetic resin as the key 2 and the hammer portions 18 and 19 has been described. However, the present invention is not limited thereto, and the resin hinges 20 and 26 may be formed of a synthetic resin having flexibility such as polypropylene (PP), and the key 2 and the hammer portions 18 and 19 may be formed of different resins. In this case, it may be formed by two-color molding. Moreover, not only this but the structure which insert-molded members, such as a highly flexible wire and a leaf | plate spring, may be sufficient as a connection part.

DESCRIPTION OF SYMBOLS 1 Keyboard chassis 2 Key 10 Key support part 10a Support shaft 15, 35 White key 16 Black key 18, 19 Hammer part 20, 26 Resin hinge 21, 27 Support shaft 21a, 27a Shaft protrusion 22, 28 Support rib 22a, 28a Bearing groove part 23, 30 Lower limit stopper 24, 31 Upper limit stopper 36 Bending part 37 Connecting part

Claims (4)

In a keyboard device in which a synthetic resin key is mounted on the keyboard chassis so as to be rotatable in the vertical direction,
A keyboard device, wherein a hammer portion for applying an action load to the key in accordance with a key pressing operation of the key is integrally formed on the key via a bendable connecting portion.   The keyboard device according to claim 1, wherein the connecting portion is a resin hinge made of the same synthetic resin as the key and the hammer portion.   The keyboard device according to claim 1, wherein a support shaft that is a rotation center of the hammer portion is integrally formed between the hammer portion and the connecting portion. The keyboard apparatus according to claim 3, wherein the keyboard chassis is provided with a hammer support portion that rotatably supports the support shaft that is a rotation center of the hammer portion.

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