JP2007248546A - Keyboard device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyboard device that can prevent noise from being generated and also reduce variation in key touch feeling even if a support shaft and a hammer holder have variation in size etc. <P>SOLUTION: The hammer holder 22 for a hammer 3 which rotates and is displaced as a key 2 is pressed to impart an action load on the key 2 is pivoted on the support shaft 16 of a hammer support part 14 provided to a keyboard chassis 1, and the hammer holder 22 is provided with an elastic depression part 34 which presses the hammer holder 22 against the support shaft 16 of the hammer support part 14 with elastic force. Therefore, even if the support shaft 16 and hammer 22 have variation in size or loosely engage each other, the hammer holder 22 can be pressed against the support shaft 16 with the elastic force of the elastic depression part 34 without any play. Consequently, noise can be prevented from being generated and variation in key touch feeling can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

Conventionally, in keyboard instruments such as electronic pianos, in order to obtain a key touch feeling similar to that of an acoustic piano, a hammer is provided on the lower side of the key so that the key can be depressed. In some cases, the hammer is configured to apply a predetermined action load to the key by rotating against the weight of the hammer.
JP 2006-3495

  In this type of keyboard instrument, the hammer consists of a hammer body made of metal and a hammer holder made of synthetic resin. This hammer holder is attached to the hammer body, and in this state, the hammer holder is provided on the keyboard chassis. By fitting to the support shaft of the part, the hammer is attached so as to be rotatable in the vertical direction around the support shaft of the hammer support part. In this case, the hammer is configured to rotate up and down between an upper limit stopper and a lower limit stopper provided on the keyboard chassis.

  However, in such a conventional keyboard instrument, the hammer can be turned up and down around the support shaft of the hammer support portion by fitting the hammer holder to the support shaft of the hammer support portion provided in the keyboard chassis. If the support shaft and hammer holder of the hammer support section provided on the keyboard chassis are dimensionally different or loosely fitted, the support shaft and hammer holder will rattle. When the hammer rotates around the support shaft in accordance with the key pressing operation, there is a problem that an abnormal noise is generated and the key touch feeling varies.

  The problem to be solved by the present invention is to provide a keyboard device capable of preventing the generation of abnormal noise and reducing the variation of the key touch feeling even if the support shaft and the hammer holder have variations in dimensions. is there.

In order to solve the above problems, the present invention includes the following components.
In addition, the reference numerals of the drawings attached to the respective elements described in the section of each embodiment described later are attached to the respective constituent elements together with parentheses.

As shown in FIGS. 1 to 17, the invention described in claim 1 includes a keyboard chassis (1), a plurality of keys (2) arranged on the keyboard chassis so as to be rotatable in the vertical direction, A keyboard device provided with a hammer (3) arranged corresponding to each of a plurality of keys, and rotating and displacing in a vertical direction in accordance with a key pressing operation of the key to apply an action load to the key.
The keyboard chassis is provided with a hammer support portion (14) having a support shaft (16), and the hammer is rotatably supported by the support shaft of the hammer support portion. One of the hammer holder and the keyboard chassis is provided with an elastic pressing portion (34, 41) for pressing the hammer holder against the support shaft of the hammer support portion by an elastic force. This is a keyboard device.

  In the invention according to claim 2, as shown in FIGS. 1 to 10, the elastic pressing portion (34) has an arc shape centered on the support shaft (16) of the hammer support portion (14). A part of the arc shape formed on the hammer holder (22) always slides in elastic contact with a predetermined portion of the keyboard chassis (1) (the edge 10b of the opening 10a of the rear mounting portion 10). The keyboard device according to claim 1.

  According to the third aspect of the present invention, as shown in FIGS. 8 to 10, the elastic pressing portion (34) has the predetermined portion (rear side) of the keyboard chassis (1) when the key (2) is pressed. The keyboard according to claim 2, wherein a projection (35) is provided to give a click feeling to the key by elastically climbing over an edge portion (10b) of the opening portion (10a) of the side mounting portion (10). Device.

  As shown in FIGS. 11 to 17, the invention according to claim 4 is an arcuate contact surface centered on the support shaft (16) of the hammer support portion (14) on the hammer holder (22). The said elastic press part (41) is provided in the said keyboard chassis (1), and always slides in elastic contact with the said contact surface of the said hammer holder, The (40) is provided. The keyboard device.

  As shown in FIGS. 16 and 17, the elastic pressing portion (41) is provided on the contact surface (40) of the hammer holder (22) when the key (2) is pressed. The keyboard device according to claim 4, further comprising a protrusion (45) that gives a click feeling to the key when it is elastically overcome.

  The invention according to claim 6 is a pair of supports in which the hammer support (14) is provided in the keyboard chassis (1) and sandwiches the hammer holder (22) as shown in FIGS. The support shaft (16) comprises a pair of substantially conical shaft portions (17) provided opposite to each other on the pair of support pieces. 5. A keyboard device according to any one of 5 above.

  According to the invention described in claim 1, the keyboard chassis is provided with the hammer support portion having the support shaft, and the hammer holder of the hammer is pivotally supported on the support shaft of the hammer support portion so as to be rotatable in the vertical direction. By providing an elastic pressing part that presses the hammer holder against the support shaft of the hammer support part with elastic force on one of the hammer holder and keyboard chassis, the support shaft and the hammer holder have a variation in dimensions and the fitting of both Even if there is looseness, the hammer holder can be pressed against the support shaft of the hammer support portion by the elastic force of the elastic pressing portion, so that the hammer holder can be pressed against the support shaft without rattling. For this reason, when the hammer rotates around the support shaft in response to a key pressing operation, it is possible to prevent the generation of noise due to rattling between the hammer holder and the support shaft and to reduce variations in the key touch feeling. can do.

  According to the second aspect of the present invention, the elastic pressing portion is formed in the hammer holder with an arc shape centering on the support shaft of the hammer support portion, and a part of the arc shape is always placed at a predetermined position of the keyboard chassis. By sliding in elastic contact, when the hammer rotates around the support shaft in accordance with the key pressing operation, the elastic pressing part of the hammer holder formed in an arc shape is always almost constant at a predetermined position on the keyboard chassis. The hammer holder can be slid in a state where it is elastically contacted with the contact force, so that the hammer holder does not rattle with respect to the support shaft, and the hammer holder can be smoothly rotated with a substantially constant frictional force with respect to the support shaft. be able to.

  According to the third aspect of the present invention, the elastic pressing portion is provided with the protruding portion that gives a click feeling to the key by elastically moving a predetermined portion of the keyboard chassis when the key is pressed. As the key is depressed, the hammer rotates about the support shaft, and when the protrusion provided on the elastic pressing part comes into contact with a predetermined portion of the keyboard chassis, the key load increases suddenly, and the elastic pressing part If the protrusions elastically climb over a predetermined part of the keyboard chassis, the key load will suddenly become lighter, which can give a click feeling that the key load will suddenly come off when the key is pressed. Furthermore, a key touch feeling similar to that of an acoustic piano is obtained.

  According to the fourth aspect of the present invention, the hammer holder is provided with an arc-shaped contact surface centered on the support shaft of the hammer support portion, and the elastic pressing portion is provided on the keyboard chassis so that the hammer holder is always elastic on the contact surface of the hammer holder. By sliding in contact, the elastic pressing part provided on the keyboard chassis is always placed on the arc-shaped contact surface provided on the hammer holder when the hammer rotates about the support shaft in accordance with the key pressing operation. It can be slid in an elastically contacted state with a substantially constant contact force, so that the hammer holder does not rattle with respect to the support shaft as in the second aspect of the invention. On the other hand, it can be smoothly rotated with a substantially constant frictional force.

  According to the fifth aspect of the present invention, the contact surface of the hammer holder is provided with the protrusion that gives the click feeling to the key by elastically moving the elastic pressing portion when the key is pressed. When the hammer is rotated around the support shaft as the key is pressed, and the elastic pressing part of the keyboard chassis comes into contact with the protrusion provided on the contact surface of the hammer holder, the key load is suddenly increased and elastic. When the protrusion of the pressing portion elastically climbs over a predetermined portion of the keyboard chassis, the key load is drastically reduced, and as a result, the key load is suddenly released during the key pressing operation of the key. Since such a click feeling can be imparted, a key touch feeling more similar to the key touch feeling of an acoustic piano can be obtained.

  According to the sixth aspect of the present invention, the hammer support portion is formed of a pair of support pieces provided on the keyboard chassis and sandwiching the hammer holder, and the support shaft is substantially conical provided on the pair of support pieces facing each other. When the pair of substantially conical shafts pivotally supports the hammer holder, the gap between the pair of shafts of the support shaft and the hammer holder is almost free. It can be supported so that it does not occur, and this can also reduce the backlash of the hammer holder with respect to the support shaft. Generation of sound can be prevented and variation in key touch feeling can be reduced.

(Embodiment 1)
Hereinafter, Embodiment 1 of the keyboard device of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the keyboard device includes a synthetic resin keyboard chassis 1 and a plurality of synthetic resin keys 2 (white) provided on the keyboard chassis 1 so as to be rotatable in the vertical direction. A key and a black key, but the white key will be described in the first embodiment.), A plurality of hammers 3 for applying an action load to each of the plurality of keys 2, and each key 2 being turned on in response to a key pressing operation. And a switch unit 4 for outputting a signal.

  The keyboard chassis 1 is disposed inside a musical instrument main body (not shown), and a keyboard chassis 1 has a front end portion (right end portion in FIG. 1) with a key as shown in FIGS. A front mounting portion 5 corresponding to the front end portion 2 is provided so as to protrude upward from the bottom portion. On the front-side mounting portion 5, a key guide 6 is provided so as to protrude upwardly to be inserted into the front end portion of the key 2 to prevent the key 2 from shaking. A rising portion 7 is provided on the front side of the intermediate portion of the keyboard chassis 1 at the same height as the front mounting portion 5 from the bottom, and a rising portion is provided at the rear end of the keyboard chassis 1. 8 is provided slightly higher than the front mounting portion 5 from the bottom.

  As shown in FIGS. 1 and 2, a rear mounting portion 10 is provided between the front rising portion 7 and the rear rising portion 8 in the intermediate portion of the keyboard chassis 1. A switch board 11 is attached on the middle part of the rear mounting part 10, and a switch part 4 described later is provided on the switch board 11. Further, on the rear end portion (left end portion in FIG. 1) of the rear mounting portion 10, a key support portion 12 is provided so as to protrude upward. The key support portion 12 includes a rear end portion of the key 2. A key support shaft 13 for rotatably supporting the part is provided. In addition, a hammer support portion 14 is provided on the lower surface of the front side of the rear mounting portion 10, and a support shaft for supporting the hammer 3 so as to be rotatable in the vertical direction is provided on the hammer support portion 14. 16 is provided.

  As shown in FIGS. 1 and 2, the key 2 is provided with key attachment holes 18 on both side surfaces of a rear end portion (left end portion in FIG. 1), and the key attachment holes 18 serve as a key support for the keyboard chassis 1. It is attached to the shaft 13 so as to be rotatable, and is thereby configured to rotate up and down around the key support shaft 13. On the rear side of the intermediate portion of the key 2, a switch pressing portion 19 is provided corresponding to the switch portion 4 of the switch board 11 provided on the keyboard chassis 1. On the front side of the switch pressing portion 19, a hammer connecting portion 20 that holds a later-described hammer contact portion 27 provided at the tip portion (right end portion in FIG. 1) of the hammer 3 is a rising portion 7 of the keyboard chassis 1. Is provided extending downward.

  In this case, the switch unit 4 includes a rubber sheet disposed on the upper surface of the switch substrate 11 as shown in FIGS. In this rubber sheet, a dome-shaped bulging portion is formed corresponding to the switch pressing portion 19 of each key 2. A pair of movable contacts having different heights are provided in the bulged portion, and a pair of fixed contacts are separated from and opposed to the pair of movable contacts on the corresponding switch substrate 11. Is provided. Thereby, as shown in FIG. 2, when the bulging portion is pressed by the switch pressing portion 19 of the key 2 during the key pressing operation, the bulging portion is elastically deformed so that the switch portion 4 has a pair of movable contacts. By sequentially contacting the pair of fixed contacts with a time difference, an ON signal corresponding to the strength of the key touch is output.

  On the other hand, as shown in FIGS. 1 to 3, the hammer 3 includes a metal hammer body 21 and a synthetic resin hammer holder 22, and the hammer holder 22 is substantially in front of the hammer body 21 (FIG. 1). In this state, the hammer holder 22 is mounted on the front lower surface (the lower right surface in FIG. 1) of the keyboard chassis 1 in this state. 16 is configured to be held rotatably. In this case, as shown in FIG. 3, the holder mounting portion 23 is formed in a substantially U-shape opened to the rear side (left side in the figure), and the rear end portion (left end in FIG. 1) of the hammer body 21. Part) is provided with a weight part 24.

  The hammer body 21 is urged counterclockwise in FIG. 1 by the weight of the weight portion 24, and the rear end portion of the weight portion 24 is against a lower limit stopper 25 such as a felt provided at the bottom end portion of the keyboard chassis 1. By abutting, the hammer body 21 is configured to be regulated at the lower limit position. The hammer body 21 is arranged on the lower surface of the rear end of the rear mounting portion 10 of the keyboard chassis 1 as shown in FIG. 2 when it rotates clockwise against the weight of the weight portion 24. By contacting the upper limit stopper 26 such as a felt, the hammer body 21 is configured to be restricted to the upper limit position.

  Further, as shown in FIGS. 1 and 2, the hammer body 21 has a front end portion (right end portion in FIG. 1) in front of the rising portion 7 through an opening 7 a provided in the rising portion 7 of the keyboard chassis 1. The hammer abutting portion 27 is provided at the projected tip portion, and the hammer abutting portion 27 is slidably inserted into the hammer connecting portion 20 of the key 2 so that the hammer main body 21 is held in the key. 2 is configured to rotate in the vertical direction about the support shaft 16 of the hammer support portion 14 in conjunction with the key pressing operation of No. 2. In this case, the upper surface of the hammer contact portion 27 is formed in an arc shape, and the arc-shaped upper surface of the hammer contact portion 27 has a cylindrical shape by being inserted into the hammer connecting portion 20 formed in a cylindrical shape. The hammer connecting portion 20 is configured to slide in a line contact state on the upper inner surface.

  As shown in FIGS. 1 to 4, the hammer holder 22 includes a bearing portion 28 rotatably held by a hammer support portion 14 provided on the lower surface of the rear mounting portion 10 of the keyboard chassis 1, and the bearing portion. A mounting portion 29 for mounting 28 on the holder mounting portion 23 of the hammer body 21 is provided. As shown in FIGS. 3 and 4, the entire bearing portion 28 is formed in a substantially inverted C shape, and is configured such that the support shaft 16 of the hammer support portion 14 is rotatably inserted into the center portion thereof. Yes. As shown in FIG. 4, the mounting portion 29 is generally formed in a substantially U shape, and the bearing portion 28 is integrally provided therein.

  In this case, as shown in FIGS. 3 and 4, the mounting portion 29 is composed of a substantially U-shaped flat plate portion 30 corresponding to the holder mounting portion 23 of the hammer body 21, and a hammer is attached to each side portion of the flat plate portion 30. A plurality of sandwiching pieces 30a for sandwiching the holder mounting portion 23 of the main body 21 in the thickness direction are integrally formed, and by pressing the flat plate portion 30 against the side surface of the holder mounting portion 23 while spreading each sandwiching piece 30a, Each sandwiching piece 30a sandwiches the edge of the holder mounting portion 23, and is thereby configured to be mounted on the holder mounting portion 23 of the hammer body 21.

  The hammer holder 22 is provided with a position restricting portion 31 as shown in FIG. The position restricting portion 31 has a tongue-like engagement portion 32 integrally formed by cutting and raising the flat plate portion 30 of the mounting portion 29, and the tongue-like engagement portion 32 is attached to the holder of the hammer body 21. The hammer holder 22 is configured to restrict the position of the hammer holder 22 relative to the hammer mounting portion 23 of the hammer body 21 by being elastically inserted and locked in a locking recess (not shown) provided in the portion 23. ing.

  Further, the hammer holder 22 is provided with an elastic pressing portion 34 that presses the bearing portion 28 against the support shaft 16 of the hammer support portion 14 by an elastic force. As shown in FIGS. 1 to 4, the elastic pressing portion 34 has a substantially arc shape from the front end portion (right end portion in FIG. 4) to the rear side (left side in FIG. 4) on the upper side of the mounting portion 29 of the hammer holder 22. Is formed. That is, the elastic pressing portion 34 is formed along the center of the bearing portion 28 of the hammer holder 22, that is, along an arc having a radius R around the support shaft 16 of the hammer support portion 14 that supports the bearing portion 28. Thus, the whole is configured to be elastically deformed toward the center side of the bearing portion 28 around the base end portion with respect to the mounting portion 29.

  In this case, as shown in FIG. 1 and FIG. 2, the elastic pressing portion 34 has a part of its outer peripheral portion elastically applied to the edge 10 b of the opening 10 a provided in the rear mounting portion 10 of the keyboard chassis 1. The bearing portion 27 of the hammer holder 22 is elastically pressed against the support shaft 16 of the hammer support portion 14 by the contact force. Further, the elastic pressing portion 34 is elastically pressed along with the rotation of the hammer holder 22 when the hammer 3 rotates in the vertical direction around the support shaft 16 of the hammer support portion 14 in accordance with the key pressing operation. The outer peripheral portion of the portion 34 is configured to slide while always elastically contacting the edge portion 10b of the keyboard chassis 1.

  By the way, as shown in FIGS. 5 and 6, the hammer support portion 14 includes a pair of support pieces 15 provided on the front side lower surface (the lower right surface in FIG. 1) of the rear mounting portion 10 in the keyboard chassis 1. The pair of support pieces 15 is provided with a support shaft 16. The support shaft 16 includes a pair of shaft portions 17 that are provided on a pair of support pieces 15 so as to face each other. In this case, the pair of support pieces 15 are configured to sandwich the hammer holder 22 when the hammer holder 22 of the hammer 3 is inserted between them from below. The pair of shaft portions 17 is formed in a substantially conical shape with the tip cut off, and is inserted into the center portion of the bearing portion 28 of the hammer holder 22 so as to support the hammer holder 22 so as to be rotatable in the vertical direction. Yes.

  In such a keyboard device, as shown in FIG. 1, the hammer 3 is normally urged counterclockwise in FIG. 1 around the support shaft 16 of the hammer support portion 14 by the weight of the weight portion 24 of the hammer body 21. Thus, the rear end portion of the weight portion 24 of the hammer body 21 abuts on the lower limit stopper 25 and the hammer 3 is restricted to the lower limit position. At this time, the hammer contact portion 27 is positioned at the upper limit in a state where the hammer contact portion 27 of the hammer body 21 is movably inserted and held in the hammer connecting portion 20 of the keyboard 2. The key 2 is pushed up by the contact portion 27 and is restricted to the upper limit position.

  In this state, when the key 2 is pressed against the weight of the weight portion 24 of the hammer body 21, the key 2 rotates clockwise in FIG. 1 around the key support shaft 13 at the rear end portion of the keyboard chassis 1. Move. At this time, since the key 2 is guided by the key guide 6, the key 2 does not swing sideways and smoothly rotates, and the hammer connecting portion 20 of the key 2 moves downward. Thereby, the hammer contact portion 27 of the hammer body 21 inserted into the hammer connecting portion 20 is pushed down.

  Accordingly, the hammer contact portion 27 slides in the hammer connecting portion 20, and the hammer body 21 is centered on the support shaft 16 of the hammer support portion 14 inserted into the bearing portion 28 of the hammer holder 22. And rotate clockwise. At this time, as indicated by the line A in FIG. 7, when the key 2 is pressed and the hammer 3 starts to rotate, the key load suddenly increases, and when the key 2 is depressed to some extent, the key load becomes substantially constant. When the key 2 is pushed down most, the hammer 3 comes into contact with the upper limit stopper 26, so that the key load becomes heavy again.

  Thereby, since the action load according to the weight of the weight part 24 of the hammer main body 21 is given to the key 2, the key touch feeling approximated to the key touch feeling of the acoustic piano can be obtained. When the key is released, the hammer 3 rotates counterclockwise in FIG. 2 due to the weight of the weight portion 24 of the hammer body 21, and returns to the initial position shown in FIG. The key load characteristic indicated by the line is drawn to return to the initial position shown in FIG.

  Thus, according to this keyboard apparatus, the hammer holder 22 of the hammer 3 is pivotally supported on the support shaft 16 of the hammer support portion 14 provided in the keyboard chassis 1 so as to be rotatable in the vertical direction. Since the elastic pressing portion 34 is provided on the hammer shaft 22 and the hammer holder 22 is pressed against the support shaft 16 of the hammer support portion 14 by the elastic force of the elastic pressing portion 34, the size of the support shaft 16 and the bearing portion 28 of the hammer holder 22 is reduced. Even if there is variation or looseness between the two, the hammer holder 22 can be pressed against the support shaft 16 by the elastic force of the elastic pressing portion 34 so as not to rattle. For this reason, when the hammer 3 rotates around the support shaft 16 in accordance with the key pressing operation, it is possible to prevent the generation of noise due to the rattling between the hammer holder 22 and the support shaft 16 and the key touch feeling. Can also reduce the variation.

  In this case, in particular, the elastic pressing portion 34 is formed in the hammer holder 22 in an arc shape centered on the support shaft 16 of the hammer support portion 14, and a part of the arc shape is the rear mounting portion 10 of the keyboard chassis 1. A hammer holder formed in an arc shape when the hammer 3 rotates around the support shaft 16 in accordance with the key pressing operation, because it always slides in contact with the edge 10b of the opening 10a provided in The 22 elastic pressing portions 34 can always be slid while being brought into elastic contact with the edge portion 10b of the opening 10a in the rear mounting portion 10 of the keyboard chassis 1 with a substantially constant contact force. For this reason, the hammer holder 22 does not rattle with respect to the support shaft 16, and the hammer holder 22 can be smoothly rotated with a substantially constant frictional force with respect to the support shaft 16. It is possible to reliably prevent the generation of abnormal noise due to rattling and to further reduce variations in the key touch feeling.

  The hammer support portion 14 includes a pair of support pieces 15 provided on the keyboard chassis 1 and sandwiching the hammer holder 22, and the support shaft 16 is a pair of substantially conical shapes provided to face the pair of support pieces 15. By comprising the shaft portion 17, when the pair of substantially conical shaft portions 17 pivotally supports the bearing portion 28 of the hammer holder 22, the pair of shaft portions 17 as the support shaft 16 and the hammer holder 22 are supported. The shaft can be supported so that there is almost no gap at the contact portion with the bearing portion 28. For this reason, the play of the hammer holder 22 with respect to the support shaft 16 can be reduced, and the hammer holder 22 can be smoothly rotated with respect to the support shaft 16. It is possible to prevent the generation of abnormal noise due to the looseness of the key and to reduce the variation in the key touch feeling.

(Embodiment 2)
Next, a second embodiment of the keyboard apparatus to which the present invention is applied will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
This keyboard device has a configuration in which a protruding portion 35 is provided on an elastic pressing portion 34 provided on the hammer holder 22, and a click feeling is given to the key 2 by the protruding portion 35 during a key pressing operation. It has the same configuration.

  That is, as shown in FIGS. 8 and 9, the protrusion 35 is provided on the outer surface of the arc-shaped elastic pressing portion 34 provided on the hammer holder 22 on the front end side (left end side in FIG. 8). When the holder 22 is rotated clockwise in FIG. 8, as shown in FIG. 9, the holder 22 abuts on the edge 10b of the opening 10a provided in the rear mounting portion 10 of the keyboard chassis 1 and flexibly overcomes it. Thus, the key 2 is configured to give a click feeling.

  According to such a keyboard device, in addition to the same effects as in the first embodiment, in particular, the key 2 is pressed, and the hammer holder 22 rotates clockwise around the support shaft 16 in FIG. Accordingly, when the elastic pressing portion 34 of the hammer holder 22 moves while contacting the edge 10b of the opening 10a in the rear mounting portion 10 of the keyboard chassis 1, the edge 10b of the rear mounting portion 10 is elastic. By making contact with the protrusion 35 provided on the pressing portion 34 and elastically overcoming it, it is possible to give the key 2 a click feeling that the key load is suddenly removed.

  That is, when the edge portion 10b of the opening portion 10a in the rear mounting portion 10 of the keyboard chassis 1 abuts on the protrusion portion 35 of the elastic pressing portion 34, the key load is suddenly increased as indicated by a portion C indicated by line A in FIG. When the edge portion 10b of the rear mounting portion 10 gets over the protruding portion 35 of the elastic pressing portion 34, the key load is drastically reduced as indicated by D portion indicated by line A in FIG. As a result, it is possible to give a click feeling that the key load is suddenly removed to the key 2 during a key pressing operation, so that a key touch feeling more similar to the key touch feeling of an acoustic piano can be obtained.

(Embodiment 3)
Next, a third embodiment of the keyboard apparatus to which the present invention is applied will be described with reference to FIGS. Also in this case, the same portions as those in the first embodiment shown in FIGS.
This keyboard device has a configuration in which an arc-shaped contact surface 40 is provided on the hammer holder 22 and an elastic pressing portion 41 is elastically contacted with the contact surface 40 of the hammer holder 22 on the keyboard chassis 1. It has almost the same configuration.

  That is, as shown in FIG. 13, the contact surface 40 of the hammer holder 22 is a support shaft of the hammer support portion 14 that pivotally supports the hammer holder 22 on the upper rear side (upper left side in FIG. 13) of the hammer holder 22. It is formed in a circular arc shape having a radius R with 16 as the center. Moreover, the elastic pressing part 41 is provided in the inclined part 43 facing the contact surface 40 of the hammer holder 22 in the rear side mounting part 10 of the keyboard chassis 1, as shown in FIG. 14 and FIG. In this case, the elastic pressing portion 41 is formed in a tongue shape by cutting and raising the inclined portion 43 of the rear mounting portion 10, thereby having a leaf spring function, and the abutting portion 42 is provided at the tip portion of the hammer holder. The protruding contact portion 42 is configured to slide in contact with the contact surface 40 of the hammer holder 22.

  According to such a keyboard apparatus, since the elastic pressing portion 41 is provided in the keyboard chassis 1 and the hammer holder 22 is pressed against the support shaft 16 of the hammer support portion 14 by the elastic force of the elastic pressing portion 41, Embodiment 1 In the same manner as described above, even if the support shaft 16 of the hammer support portion 14 and the bearing portion 28 of the hammer holder 22 have dimensional variations or the fitting between the two is loose, the hammer holder 22 is rattled with respect to the support shaft 16. It can be pressed so that there is no. For this reason, when the hammer 3 rotates around the support shaft 16 in accordance with the key pressing operation, it is possible to prevent the generation of noise due to the rattling between the hammer holder 22 and the support shaft 16 and the key touch feeling. Can also reduce the variation.

  In this case, in particular, the hammer holder 22 is provided with an arc-shaped contact surface 40 centered on the support shaft 16 of the hammer support portion 14, and an elastic pressing portion 41 is provided on the rear mounting portion 10 of the keyboard chassis 1. By sliding while always elastically contacting the contact surface 40 of the holder 22, when the hammer 3 rotates about the support shaft 16 in accordance with the key pressing operation, the contact portion 42 of the elastic pressing portion 41 is always moved to the hammer. The holder 22 can be slid while being elastically contacted with the arc-shaped contact surface 40 of the holder 22 with a substantially constant contact force. For this reason, as in the first embodiment, the hammer holder 22 does not rattle with respect to the support shaft 16, and the hammer holder 22 can be smoothly rotated with a substantially constant frictional force with respect to the support shaft 16. It is possible to reliably prevent the generation of noise due to the play between the holder 22 and the support shaft 16 and to further reduce variations in the key touch feeling.

(Embodiment 4)
Next, with reference to FIG. 16 and FIG. 17, Embodiment 4 of the keyboard apparatus to which this invention is applied is demonstrated. In this case, the same reference numerals are given to the same portions as those in the third embodiment shown in FIGS.
In this keyboard device, a projection 45 is provided on an arc-shaped contact surface 40 provided on the hammer holder 22, and a click feeling is given to the key 2 by the projection 45 when a key is pressed. 3 is the same configuration.

  That is, as shown in FIGS. 16 and 17, the protrusion 45 is provided on the lower side of the arc-shaped contact surface 40 provided on the hammer holder 22, and the hammer holder 22 rotates clockwise in FIG. When the key 2 is clicked, the contact portion 42 at the tip of the elastic pressing portion 41 provided on the rear mounting portion 10 of the keyboard chassis 1 comes into contact and elastically moves over as shown in FIG. It is comprised so that a feeling may be provided.

  According to such a keyboard device, in addition to the same effects as in the third embodiment, in particular, the key 2 is depressed, and the hammer holder 22 rotates clockwise around the support shaft 16 in FIG. Accordingly, when the protrusion 45 provided on the contact surface 40 of the hammer holder 22 moves and contacts the contact portion 42 of the elastic pressing portion 41 provided on the rear mounting portion 10 of the keyboard chassis 1, When the load suddenly increases and the abutting portion 42 of the elastic pressing portion 41 gets over the protrusion 45 provided on the contact surface 40 of the hammer holder 22, the key load is drastically reduced, which is the same as in the second embodiment. Since the key 2 can be given a click feeling that the key load is suddenly removed during the key pressing operation, a key touch feeling more similar to the key touch feeling of the acoustic piano can be obtained.

  In the first to fourth embodiments described above, the support shaft 16 of the hammer support portion 14 has been described as having a configuration in which a pair of substantially conical shaft portions 17 are provided on a pair of support pieces 15 so as to face each other. However, the support shaft is not limited to this, and may be a single round rod-shaped shaft portion spanned between the pair of support pieces 15.

It is sectional drawing which showed the keyboard apparatus to which this invention is applied. (Embodiment 1) It is sectional drawing which showed the key pressing state of the keyboard apparatus of FIG. It is the side view which showed the hammer of FIG. FIG. 4 is an enlarged side view showing the hammer holder of FIG. 3. It is a front view of the principal part which showed the hammer support part of FIG. FIG. 6 is an enlarged front view, partly broken, illustrating a state in which a hammer is attached to the hammer support portion of FIG. 5. It is the figure which showed the relationship between the key stroke at the time of key pressing operation, and a key load. It is sectional drawing which showed the principal part of the hammer holder and keyboard chassis in the keyboard apparatus to which this invention is applied. (Embodiment 2) It is sectional drawing which showed the principal part of the hammer holder and keyboard chassis in the key pressing state of the keyboard apparatus of FIG. It is the figure which showed the relationship between the key stroke at the time of key pressing operation of the keyboard apparatus of FIG. 8, and a key load. It is sectional drawing which showed the keyboard apparatus to which this invention is applied. (Embodiment 3) It is sectional drawing which showed the key pressing state of the keyboard apparatus of FIG. It is the expanded side view which showed the hammer holder of FIG. FIG. 12 is an enlarged cross-sectional view showing a main part near the hammer holder in the state of FIG. 11. FIG. 13 is an enlarged cross-sectional view showing a main part near the hammer holder in the state of FIG. 12. It is sectional drawing which showed the principal part near the hammer holder in the keyboard apparatus to which this invention is applied. (Embodiment 4) It is sectional drawing which showed the principal part vicinity of the hammer holder in the key pressing state of the keyboard apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Keyboard chassis 2 Key 3 Hammer 10 Rear side mounting part 10b Edge 12 Key support part 14 Hammer support part 15 A pair of support piece 16 A support shaft 17 A pair of shaft part 21 A hammer main body 22 A hammer body 23 A holder attachment part 28 A bearing part 29 Mounting part 34, 41 Elastic pressing part 35, 45 Protrusion part 40 Contact surface 42 Contact part

Claims (6)

A keyboard chassis, a plurality of keys arranged on the keyboard chassis so as to be rotatable in the vertical direction, and arranged corresponding to each of the plurality of keys, and rotated in the vertical direction in accordance with the key pressing operation of the keys. In a keyboard device comprising a hammer that displaces and applies an action load to the key,
The keyboard chassis is provided with a hammer support portion having a support shaft, and the hammer is provided with a hammer holder pivotally supported on the support shaft of the hammer support portion. One of the keyboard chassis is provided with an elastic pressing portion that presses the hammer holder against the support shaft of the hammer support portion by an elastic force.   The elastic pressing portion is formed in the hammer holder in an arc shape centering on the support shaft of the hammer support portion, and a part of the arc shape is always in elastic contact with a predetermined portion of the keyboard chassis and slides. The keyboard device according to claim 1, wherein:   The elastic pressing portion is provided with a projection portion that gives a click feeling to the key by elastically moving over the predetermined portion of the keyboard chassis when the key is pressed. 2. The keyboard device according to 2.   The hammer holder is provided with an arc-shaped contact surface centered on the support shaft of the hammer support portion, and the elastic pressing portion is provided on the keyboard chassis and is always elastic on the contact surface of the hammer holder. The keyboard apparatus according to claim 1, wherein the keyboard apparatus slides in contact with the keyboard apparatus.   The contact surface of the hammer holder is provided with a protrusion that gives a click feeling to the key by elastically moving the elastic pressing portion when the key is pressed. 4. The keyboard device according to 4. The hammer support portion includes a pair of support pieces provided on the keyboard chassis and sandwiching the hammer holder, respectively, and the support shaft is a pair of substantially conical shapes provided to face the pair of support pieces. The keyboard device according to claim 1, comprising a shaft portion.

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