JP4411103B2 - Electronic keyboard instrument keyboard device - Google Patents

Description

  The present invention relates to a keyboard device for an electronic keyboard instrument used for an electronic piano or the like, and more particularly to a keyboard device that gives a let-off feeling similar to that of an acoustic piano when a key is pressed.

  In a general acoustic piano, the touch weight changes as follows between the start time and the end time as the key is rotated by pressing and releasing the key. That is, in the initial stage of the key press, the touch weight remains substantially constant as the key and the action rotate together. When it rotates to some extent, the touch weight increases greatly and then decreases immediately thereafter. The increase in touch weight at this time is due to the fact that the jack of the action becomes a resistance to rotation by abutting the regulating button, etc., and the decrease in the touch weight, the jack pushes up the hammer, This is because the rotational resistance disappears when the lever is pulled out (hereinafter referred to as “let-off”). After the let-off, when the key pressing is finished, the touch weight is greatly increased again. When the key is released after the key is pressed, the touch weight is entirely smaller than that when the key is pressed. In the key release process, no resistance is generated as when the key is pressed, so the touch weight remains almost constant. The touch weight at the time of pressing and releasing the key may be set to a slightly different value depending on whether it is a high-pitched portion or a low-pitched portion, or depending on the model, but changes almost as described above.

  For example, Patent Document 1 discloses a keyboard device for reproducing such a change in touch weight, in particular, a feeling that the touch weight acting on a finger suddenly increases or decreases before and after letoff (hereinafter referred to as “letoff feeling”). What is disclosed is known. The keyboard device includes a plurality of rotatable keys, an elastic body attached to a rear end portion of each key so as to protrude rearward thereof, and arranged behind the plurality of keys, and extends in a key arrangement direction. A rail and a tangent provided rotatably on the rail via a flange are provided. The tangent is urged toward the elastic body by a spring disposed between the rails and has a claw at one end.

  When the key is rotated by being depressed, the elastic body at the rear end abuts against the tangent claw. As the key further rotates, the key rotates while the elastic body is elastically deformed in a state where the claw portion is engaged, thereby increasing the touch weight of the key. A feeling of let-off is imparted by coming off the part. On the other hand, when the key is released, the key rotates in the direction opposite to that when the key is pressed, and the elastic body comes into contact with the claw portion from the direction opposite to that when the key is pressed. The key rotates against the urging force of the spring that urges the tangent, and returns to the original position.

  However, the conventional keyboard device described above has the following problems. That is, in the conventional keyboard device, although a let-off feeling can be obtained with certainty, it is necessary to use dedicated components for obtaining a let-off feeling such as rails, elastic bodies, and tangents. In particular, an elastic body and a tangent must be provided for each key. Therefore, when the number of parts increases, the configuration becomes complicated and the cost required for manufacture and assembly increases.

  The present invention has been made to solve the above problems, and provides a keyboard device for an electronic keyboard instrument that can obtain a let-off feeling similar to an acoustic piano with a relatively simple configuration. It is aimed.

Japanese Utility Model Publication No. 60-88387 (Page 3, Figures 2-6)

In order to achieve this object, the invention according to claim 1 of the present invention provides a plurality of keys that rotate in opposite directions at the time of key depression and key release, and rotation of the corresponding key provided for each key. Accordingly, a plurality of hammers rotating in a direction corresponding to the rotation direction of the key, a stationary mounting member, an elastic member provided on one of the hammer and the mounting member, and the other of the hammer and the mounting member are provided. An engaging portion disposed so as to be engaged with the elastic member during the rotation of the hammer, elastically deforming the elastic member, and then disengaged from the elastic member before the key is pressed. Has a sheet-like elastic member side engaging portion, and the elastic member side engaging portion has first and second engaging surfaces provided on one and the other of the front surface side and the back surface side, respectively. parts are first engaged with the key-depression of the key to the first engagement surface of the elastic member side engagement portion Engaging surface and having a second engaging surface for engaging the second engaging surface of the elastic member-side engaging portion during key release key, the elastic member side engagement portion and the first engagement of the engagement portion The mating surfaces are formed so as to be in surface contact with each other at an angle substantially perpendicular to the rotation direction of the hammer, and at least one of the elastic member side engagement portion and the second engagement surface of the engagement portion is the rotation direction of the hammer On the other hand, in order to make it easy to disengage from the other, it is configured by an inclined surface or a curved surface that contacts the other second engagement surface in an oblique tangential direction.

  According to the keyboard device of this electronic keyboard instrument, the keys are rotated in opposite directions by pressing or releasing the key, and accordingly, the hammer is also rotated in a direction corresponding to the rotation direction of the key. Further, when the hammer rotates, one of the engaging portion and the elastic member protruding outward from the hammer engages with the other provided on the mounting member, and the key is pressed by releasing. A finger-off feeling is imparted to the finger. Specifically, when the key is pressed, the elastic member is elastically deformed as the engaging portion engages with the elastic member and further rotates. Thereby, the touch weight of the key for rotating the hammer is increased, and the touch weight is suddenly reduced by the engagement portion being detached from the elastic member. Such a change in touch weight acts as a let-off feeling. On the other hand, when the key is released, the engagement portion engages with the elastic member from the opposite direction, so that the touch weight is reduced during that time.

As described above, the touch weight can be reliably increased until the engaging portion engages with the elastic member and is disengaged. Further, the touch weight is suddenly reduced by the disengagement of the engaging portion. Therefore, the let-off feeling similar to that of the acoustic piano can be obtained with the relatively simple configuration as described above.
Further, according to this keyboard device, when the hammer rotates when the key is depressed, the engaging portion and the sheet-like elastic member side engaging portion engage with each other via the first engaging surfaces. Since both engage with each other so as to be in surface contact with each other at an angle substantially perpendicular to the rotation direction of the hammer, the engaging portion is difficult to be disengaged from the elastic member side engaging portion, and the pressing force from the engaging portion is elastic. The range in which the elastic member is deformed by concentrating on the narrow range of the member side engaging portion is also narrowed. For this reason, since a large pressing force, that is, a key pressing force is required to deform the elastic member, a large touch weight can be obtained. Therefore, a clearer let-off feeling can be obtained when the engaging portion is disengaged from the elastic member side engaging portion .
On the other hand, when the hammer rotates in the reverse direction when the key is released, the hammer engages with each other via the second engagement surface. At that time, because at least one of the second engagement surfaces of both is constituted by an inclined surface or a curved surface, with the rotation of the hammer, a force in the opposite direction acts between the two, Compared to key pressing, the engaging portion can be easily detached from the elastic member side engaging portion , and the elastic member can be deformed with a smaller pressing force. For this reason, the change in the touch weight at the time of key release can be reduced, and the change in the touch weight closer to the acoustic piano can be obtained from the start of the key press to the end of the key release. .

According to a second aspect of the present invention, in the keyboard device for an electronic keyboard instrument according to the first aspect, the engaging portion is elastic at a predetermined first rotation angle during the rotation of the hammer during key depression. A key switch for detecting key pressing information for generating a performance sound by engaging with the member side engaging portion and being pressed at a predetermined second rotation angle by a hammer; Features.

According to this keyboard device, when the key is depressed, the engagement portion engages with the elastic member side engagement portion at the first rotation angle in which the hammer is rotated by a predetermined angle from the key release state. Further, when the key switch is pressed by the hammer at a predetermined second rotation angle, key pressing information for generating a performance sound is detected. That is, the timing at which the let-off feeling is generated and the timing at which the key pressing information is detected can be defined by the first and second rotation angles of the hammer that is a single component. As a result, for example, the relationship between the timing at which the performance sound is actually generated and the timing at which the let-off sensation can be set easily and accurately, so this keyboard device can be played with a sense closer to that of an acoustic piano. Can do.

According to a third aspect of the present invention, in the keyboard device for an electronic keyboard musical instrument according to the first or second aspect, the engaging portion is provided for each hammer, and the elastic member side engaging portion extends over the plurality of hammers. It is provided so that it may extend in the row direction.

According to this keyboard device, when the key is depressed, the engagement portion provided for each hammer is engaged with the elastic member- side engagement portion provided over the plurality of hammers, thereby giving a let-off feeling. . Thereby, although it is necessary to provide the engaging portion for each hammer, the elastic member only needs to be provided for each of the plurality of hammers, so that the number of elastic members can be greatly reduced. Therefore, a let-off feeling can be obtained with a simpler configuration, and the cost required for manufacturing and assembly can be reduced.

According to a fourth aspect of the present invention, in the keyboard device for an electronic keyboard instrument according to any one of the first to third aspects, the engaging portion and the elastic member- side engaging portion are configured to rotate the hammer when the key is depressed. than the reaction force from the elastic member side engagement portion generated when the engaging portion is engaged in, during rotation of the hammer during the key release, the elastic member side engagement that occurs when the engaging portion is engaged The reaction force from the joint is configured to be small.

According to this keyboard apparatus, the reaction force from the elastic member side engaging portion that is generated when the engaging portion engages with the elastic member side engaging portion and elastically deforms the engaging portion is greater than when the key is released. Is smaller. That is, in this keyboard device, the magnitude of the change in the touch weight caused by the engaging portion elastically deforming the engaging portion on the elastic member side is greater when the key is pressed than when the key is released. The change in the touch weight from the start to the end of the key release can be brought close to that of an acoustic piano, and it can be played with a feeling close to that of an acoustic piano.

According to a fifth aspect of the present invention, in the keyboard device for an electronic keyboard instrument according to any one of the first to fourth aspects, the engaging portion is provided on the hammer, the elastic member is provided on the mounting member, , Having a support surface for supporting an elastic member facing the side where the engaging portion is positioned before key pressing, the elastic member being fixed at the base end portion, and the elastic member side engaging portion being at the support surface It is characterized by being arranged so that it may extend along and a tip part which an engaging part may engage may protrude beyond a support surface.

According to this keyboard device, the elastic member is fixed to the attachment member at the base end portion, and the elastic member side engagement portion extends along the support surface of the attachment member. Is engaged from the support surface side to the distal end portion of the elastic member side engagement portion protruding beyond the support surface. At that time, since the pressing force from the engaging portion to the elastic member side engaging portion is supported by the support surface except for the tip portion of the elastic member side engaging portion, only the tip portion is substantially deformed. On the other hand, at the time of key release , the elastic member deforms the elastic member side engaging portion as a whole with the base end portion as a fixed point in response to pressing from the engaging portion of the hammer rotating in the reverse direction. .

That is, when the key is pressed, only the tip of the elastic member side engaging portion is substantially deformed, so that a larger pressing force is required. Since the distance is larger than that when the key is depressed, the elastic member side engaging portion is easily bent, and the elastic member side engaging portion can be deformed with a smaller pressing force. As described above, a clear let-off feeling can be obtained when the key is pressed, and a change in touch weight when the key is released can be further reduced. Accordingly, a change in touch weight closer to that of the acoustic piano can be obtained from the start of key pressing to the end of key release.

It is a side view which shows the keyboard apparatus of the electronic piano to which this invention is applied. It is the elements on larger scale of the elastic member of the keyboard apparatus of FIG. 1, and the protrusion vicinity of a hammer. It is a partial side view which shows the front part of a keyboard apparatus when the protrusion of a hammer has engaged with the elastic member in the 1st angular position. It is a figure which shows the state which the protrusion engages, deform | transforming an elastic member, when a hammer rotates at the time of key pressing. It is a partial side view which shows the front part of a keyboard apparatus when a key press is complete | finished. It is a side view which shows the front part of a keyboard apparatus when the protrusion of a hammer has engaged with the elastic member at the time of key release. It is a figure which shows the state which the protrusion engages, deform | transforming an elastic member, when a hammer rotates at the time of a key release. It is a figure which shows the change of the stroke of a key and touch weight of the keyboard apparatus of FIG. 1 from the time of the start of a key press to the end of a key release.

  Hereinafter, an embodiment of a keyboard device to which the present invention is applied will be described in detail with reference to the drawings. FIG. 1 shows an electronic piano keyboard apparatus according to the present invention. This keyboard device 1 is for 88 keys, and as shown in the figure, 88 pieces comprising a chassis 2 and a white key 3a and a black key 3b rotatably attached to the rear end portion of the chassis 2 are shown. Key 3 (only one of each of white key 3a and black key 3b is shown in FIG. 1) and a plurality of hammers 4 (1 in FIG. 1) rotatably attached to the center of chassis 2 for each key 3. Only one is shown).

  The chassis 2 extends in the left-right direction (the depth direction in FIG. 1) and is supported on the shelf board 5. As shown in the figure, the chassis 2 has four connecting bars 40 (attachment members), 6a to 6c that extend in the left-right direction and are arranged in the front-rear direction (left-right direction in FIG. 1). 9 is fixed. Each of the connecting bars 40, 6a to 6c is a single long and narrow angle-shaped member extending in the left-right direction of the chassis 2, and is formed by bending a steel plate, for example. Further, reinforcing ribs 8 extending in the front-rear direction are arranged for each octave (only one is shown in FIG. 1), and this rib 8 is formed by bending a single steel plate using a die, for example. Is formed by. As described above, the chassis 2 connected by the connection bars 40, 6a to 6c and reinforced by the ribs 8 is fixed to the shelf board 5 by the screws 10 through the front and rear connection bars 40, 6c.

The connecting bar 40 is substantially U-shaped in cross section and is open to the rear. Further, an elastic member 41 is attached to an upper end portion inside the connection bar 40. The elastic member 41 is made of, for example, silicon, synthetic rubber, foamed urethane, or the like, and extends in the left-right direction of the chassis 2, that is, over all the keys 3 like the connection bar 40. Further, as shown in FIG. 2, the cross section is formed in an L shape, and a base portion 42 extending in the vertical direction, and a sheet-like engagement portion 43 extending backward from the upper end portion of the base portion 42 (elastic member side engagement) Joint part) . The front surface of the base portion 42 is affixed to the inner surface of the front wall 40a of the connection bar 40 by, for example, a double-sided tape, while the engagement portion 43 is a support that is the lower surface of the top wall 40b of the connection bar 40 The tip 44 extends along the surface 40c without being attached to the surface 40c, and protrudes rearward beyond the support surface 40c. The engaging portion 43 is formed with a hole (not shown) penetrating in the vertical direction at a position corresponding to the screw 9 described above, and the screw 9 is passed through this hole. Further, the lower surface of the front end portion 44 is a first engagement surface 44a extending substantially horizontally, and the upper surface is a second engagement formed in a curved shape so as to curve downward toward the rear end. It is the surface 44b.

  At the rear end of the chassis 2 is a key shaft hole 11 that supports the key 3, at the center is a hammer recess 12 that supports the hammer 4, and further, the hammer 4 passes through the front and center. The first and second hammer passage holes 13a and 13b are formed on the rear side of the first hammer passage hole 13a, and a key passage hole 15 through which the stopper portion 14 of the key 3 passes is formed for each key 3. . Further, the chassis 2 has white key guides 16a at positions corresponding to the white keys 3a on the front side of the first hammer passage hole 13a and black positions at positions corresponding to the black keys 3b on the rear side of the key passage holes 15. Each of the key guides 16b is erected.

  Further, the chassis 2 includes key lower limit stoppers 17a and 17b for black keys and white keys, a key upper limit stopper 18, a hammer lower limit stopper 19, and a hammer upper limit stopper for restricting the rotation of the key 3 and the hammer 4. 24 is provided. The black key lower limit stopper 17a and the key upper limit stopper 18 are attached to the upper surface and the lower surface of the chassis 2 at the same position between the key passage hole 15 and the black key guide 16b so as to sandwich the chassis 2. The hammer lower limit stopper 19 is attached to the lower end portion of the front connecting bar 40, and the hammer upper limit stopper 24 and the white key key lower limit stopper 17b are located behind the white key guide 16a, and are located in the chassis. 2 are respectively attached to the upper surface and the lower surface of the chassis 2 so as to sandwich the 2. Each of these stoppers 17a, 17b, 18, 19, and 24 is made of a single band-shaped cushioning material that extends over the entire left and right direction of the chassis 2, for example, foamed urethane with a felt attached to the surface.

  Further, a key switch 20 for detecting key press information of the key 3 is provided behind the hammer recess 12 of the chassis 2. The key switch 20 includes a printed circuit board 21 screwed to the chassis 2 and a switch body 22 provided on the upper surface thereof. The switch body 22 faces the second hammer passage hole 13b of the chassis 2 from below, and is connected via a printed circuit board 21 to a control device (not shown) that controls sound generation of the electronic piano.

  The key 3 (white key 3a and black key 3b) is made of, for example, an AS resin injection-molded product, and has both side walls 3c (only one is shown in FIG. 1), the top wall 3d, etc., and the bottom surface is open. It has an inverted U-shaped cross section. An inwardly projecting pin 23 is formed at the rear end portion of both side walls 3c of the key 3, and the pin 23 engages with the key shaft hole 11 at the rear end portion of the chassis 2, thereby 3 is rotatably supported by the chassis 2. Further, the key 3 is formed with hook-like stopper portions 14 extending downward from the front portion on both side walls 3c.

  On the other hand, the hammer 4 includes a hammer body 25, two mass plates 26 and 26 (only one side is shown in FIG. 1) attached to the left and right sides of the front end portion of the hammer body 25, and the front end portion of the hammer body 25. It is comprised by the stopper 31 etc. which were attached to. The hammer body 25 is composed of an ABS resin injection-molded product or the like, and a pin 27 protruding from both sides is formed at the rear end of the hammer body 25, and the pin 27 engages with the hammer recess 12 of the chassis 2. Thus, the hammer 4 is rotatably supported by the chassis 2. The mass plate 26 is for giving the hammer 4 a touch weight similar to that of an acoustic piano, and is made of a steel plate having a specific gravity larger than that of the hammer body 25.

  The portion behind the pin 27 of the hammer body 25 is a switch pressing portion 28, which faces the second hammer passage hole 13 b of the chassis 2 and faces the switch body 22 of the key switch 20. While facing from above, an actuator portion 29 provided on the lower surface of the key 3 is in contact with the switch pressing portion 28 from above. The hammer body 25 has a central portion that vertically crosses the second hammer passage hole 13b of the chassis 2 and extends forward on the lower side of the chassis 2, and the mass plates 26 and 26 described above are formed on the left and right side surfaces of the front portion. At the front end, a stopper mounting portion 30 is formed so as to protrude forward.

  A stopper 31 is attached to the stopper attachment portion 30. The stopper 31 is made of, for example, a synthetic resin molded product, is formed in a U-shaped cross section, and is fixed to the stopper mounting portion 30 while being fitted from the front. The stopper 31 is provided with a protrusion 32 (engagement portion). The protrusion 32 is integrally formed with the stopper 31 and protrudes from the upper end portion of the front surface thereof. The protrusion 32 has an upper first engagement surface 32a and a lower second engagement surface 32b. The first engagement surface 32a is arranged in a direction substantially orthogonal to the front surface of the stopper 31. The two engaging surfaces 32b extend obliquely upward from the front surface.

  Next, operations at the time of key depression and key release of the keyboard device 1 having the above-described configuration will be described. First, when the key 3 is depressed from the key release position shown in FIG. 1, the key 3 and the hammer 4 are rotated in predetermined directions. Specifically, the key 3 rotates downward (counterclockwise in FIG. 1) about the pin 23 while the stopper portion 14 passes through the key passage hole 15 of the chassis 2, and the white key guide The guide 16b or the black key guide 16b is guided so as not to move left and right. Further, the downward rotation of the key 3 at this time is restricted by the lower surface of the key 3 coming into contact with the key lower limit stopper 17a or 17b.

  As the key 3 is pressed, the hammer 4 rotates upward (clockwise in FIG. 1) about the pin 27 when the switch pressing portion 28 is pressed by the actuator portion 29 of the key 3. During this rotation, the reaction force from the hammer 4 having the mass plates 26 and 26 acts on the finger as a touch weight via the key 3 (A in FIG. 8).

  When the hammer 4 is rotated to a first predetermined angle (first rotation angle) (the state shown in FIG. 3), the protrusion 32 at the front end of the hammer 4 is formed on the elastic member 41 and the first engaging surface of each other. It engages in the state which surface-contacted at the angle substantially orthogonal to the rotation direction of the hammer 4 via 32a, 44a. As the rotation further proceeds, the protrusion 32 presses the elastic member 41 upward, so that the hammer 4 rotates upward while elastically deforming it as shown in FIG. At this time, the engaging portion 43 of the elastic member 41 is supported by the support surface 40c of the connecting bar 40 except for the tip portion 44 against the pressing force from the protrusion 32, so that only the tip portion 44 is substantially elastic. Deform.

  When the protrusion 32 presses the elastic member 41, the reaction force from the elastic member 41 is transmitted to the finger that presses the key via the hammer 4 and the key 3, thereby causing the reaction force from the elastic member 41. Touch weight increases by the amount of power. As the rotation further proceeds, the reaction force from the elastic member 41, that is, the touch weight suddenly increases as the deformation amount of the elastic member 41 increases (B in FIG. 8). When the amount of deformation of the elastic member 41 becomes large to some extent, the protrusion 32 is detached from the elastic member 41 (corresponding to letoff of an acoustic piano (C in FIG. 8)), and the reaction force from the elastic member 41 disappears. As a result, the touch weight suddenly decreases (D in FIG. 8).

  And when the stopper part 30 of the hammer 4 contacts the hammer upper limit stopper 24 (state of FIG. 5), the rotation of the hammer 4 at the time of key pressing is completed. The rotation of the key 3 also ends almost simultaneously, and the rotation of the key 3 is prevented by the key lower limit stopper 17a or 17b, so that the touch weight is greatly increased (E in FIG. 8). Further, the upward rotation of the hammer 4 is regulated by the hammer upper limit stopper 24.

  Further, when the hammer 4 is rotated to the second predetermined angle (second rotation angle) after the let-off, the switch pressing portion 28 presses the switch body 22 of the key switch 20 and turns on. Let Thereby, key depression information of the key 3 is detected, and the sound generation of the electronic piano is controlled by the control device according to the detection result.

Next, when the key 3 is released from the state where the key depression is completed, the key 3 and the hammer 4 are rotated back in the opposite directions to the above-described key depression due to the weight of the hammer 4, respectively. Return to. When the hammer 4 returns and rotates, the protrusion 32 engages with the elastic member 41 via the second engagement surfaces 32b and 44b by rotating in the opposite direction to the time of key depression ( FIG. 6). As the hammer 4 further returns and pivots, the protrusion 32 presses the elastic member 41 downward, and a force acts on the both 32 and 41 in a direction away from each other. This is a component force of the pressing force from the projection 32 to the elastic member 41, as described above, the second engagement surface 44b of the elastic member 41 is a curved surface, the second engagement of the collision force 3 2 This is because the surface 32 b extends obliquely upward from the front surface of the stopper 31, that is, both the 32 and 41 contact each other's second engagement surfaces 32 b and 41 b in the oblique tangential direction.

  Further, as described above, since the elastic member 41 is fixed only at the base portion 42, the engaging portion 43 is caused to be fully engaged by the pressing force from the protrusion 32 as shown in FIG. Deforms to curve downward. That is, the distance between the tip 44 where the pressing force acts and the fulcrum (the connecting portion between the engaging portion 43 and the base portion 42) that supports the engaging portion 43 with respect to the pressing force is greater than when the key is pressed. The elastic member 41 is easily bent, and the elastic member 41 is deformed with a pressing force smaller than the pressing force required to elastically deform the distal end portion 44 when the key is pressed. Therefore, the amount of change in the touch weight associated with the engagement between the protrusion 32 and the elastic member 41 when the key is released is smaller than when the key is pressed (F in FIG. 8).

  After the protrusion 32 is detached from the elastic member 41, the key 3 and the hammer 4 each return to the key release position. The downward rotation of the hammer 4 at this time is regulated by the stopper 31 coming into contact with the hammer lower limit stopper 19, and the upward rotation of the key 3 is caused by the stopper portion 14 coming into contact with the key upper limit stopper 18. (State of FIG. 1).

  As described above, according to the keyboard device 1 of the present embodiment, the touch weight can be reliably increased until the protrusion 32 is engaged with the elastic member 41 at the first angular position and is released. . Further, since the protrusion 32 is detached, the touch weight is abruptly reduced, so that a let-off feeling similar to that of an acoustic piano can be obtained with a relatively simple configuration as described above.

  Further, when the key is depressed, the protrusion 32 engages with the elastic member 41 at the first angular position where the hammer 4 is rotated by a predetermined angle from the key release state. When the switch 20 is pressed, key press information for generating a performance sound is detected. That is, the timing at which the let-off feeling is generated and the timing at which the key pressing information is detected can be defined by the first and second angular positions of the hammer 4 that is a single component. Thereby, for example, the relationship between the timing at which the performance sound is actually generated and the timing at which the let-off sensation can be set easily and accurately, so that the performance can be performed with a sense closer to that of an acoustic piano.

  Further, when the key is depressed, the protrusion 32 provided for each hammer 4 is engaged with the elastic member 40 provided over all the hammers 4, thereby giving a let-off feeling. Thereby, although it is necessary to provide the protrusion 32 on each hammer 4, the elastic member 40 may be a single member, so that a let-off feeling can be obtained with a simpler configuration, and the cost required for manufacture and assembly is reduced. be able to.

  Further, when the hammer 4 rotates when the key is pressed, the protrusion 32 and the sheet-like elastic member 41 are at an angle substantially orthogonal to the rotation direction of the hammer 4 via the first engagement surfaces 32a and 44a. Since the protrusions 32 are engaged with each other while being in surface contact, the protrusion 32 is unlikely to be detached from the elastic member 41, and the pressing force from the protrusion 32 is concentrated in a narrow range of the elastic member 41, so that the range in which the elastic member 41 is deformed is also narrow. Become. For this reason, since the elastic member 41 is deformed, a larger pressing force, that is, a key pressing force is required, so that a large touch weight can be obtained. Therefore, a clearer let-off feeling can be obtained when the protrusion 32 is detached from the elastic member 41.

  On the other hand, when the hammer 4 rotates in the opposite direction when the key is released, the hammer 4 engages with each other via the second engaging surfaces 32b and 44b, and both the engaging surfaces 32b and 44b are inclined surfaces and curved surfaces, respectively. As the hammer 4 is rotated, forces directed in opposite directions act between the two 32 and 41. Thereby, compared with the time of key pressing, while the protrusion 32 is easy to remove | deviate from the elastic member 41, the elastic member 41 can be deformed with a smaller pressing force. For this reason, a change in touch weight at the time of key release can be reduced, and therefore, a change in touch weight closer to the acoustic piano can be obtained from the start of key depression to the end of key release.

  Furthermore, since only the distal end portion 44 of the elastic member 41 is substantially deformed when the key is pressed, a larger pressing force is required. On the other hand, when the key is released, the distance from the operating point of the pressing force to the fulcrum. Is longer than when the key is pressed, the elastic member 41 is easily bent, and the elastic member 41 can be deformed with a smaller pressing force. Therefore, a clear let-off feeling can be obtained when the key is pressed, and a change in touch weight when the key is released can be further reduced. Therefore, a change in touch weight closer to that of an acoustic piano can be obtained from the start of key depression to the end of key release.

  In addition, this invention can be implemented in various aspects, without being limited to the embodiment described above. For example, in the embodiment, the protrusion 32 is provided on the hammer 4 and the elastic member 41 is provided on the connecting bar 40. However, the present invention is not limited to this. As an alternative, other components may be used in place of the connecting bar 40. In the embodiment, the elastic member 41 is provided so as to extend over all the keys 3. However, the elastic member 41 is not limited to this. For example, the elastic member 41 can be partially exchanged by being provided for each of the plurality of keys 3. You may do it.

  In the embodiment, the second engagement surfaces 32b and 44b are formed on the inclined surface and the curved surface, respectively, so that the protrusion 32 and the elastic member 41 are in contact with each other in an oblique tangential direction. Although forces are applied in directions away from each other, these may be reversed. Moreover, you may form only one of the 2nd engagement surfaces 32b and 44b in a slope or a curved surface. Further, in the embodiment, the protrusion 32 and the elastic member 41 are in surface contact at an angle orthogonal to the rotation direction of the hammer 4 when the key is pressed, and contacted in an oblique tangential direction when the key is released, and the elastic member 41 is attached. By applying both the pressing force required for the protrusion 32 to be detached from the elastic member 41 between the time of pressing and releasing the key, the change in touch weight is made closer to that of the acoustic piano. However, only one of them may be applied. In the embodiment, the let-off feeling is generated by engaging the protrusion 32 with the elastic member 41. However, the embodiment is not limited thereto, and the protrusion 32 is counteracted against the hammer 4 by engaging with the elastic member 41. Any structure may be used as long as it exerts a force and the reaction force disappears when it comes off.

  Furthermore, the embodiment is an example in which the present invention is applied to a keyboard device of an electronic piano, but it goes without saying that the present invention may be applied to other types of electronic keyboard instruments. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Keyboard apparatus 3 Key 4 Hammer 20 Key switch 32 Protrusion (engagement part)
32a 1st engagement surface 32b 2nd engagement surface 40 Connection bar (attachment member)
40c Support surface 41 Elastic member
43 engaging part (elastic member side engaging part)
44 Tip 44a First engagement surface 44b Second engagement surface

Claims (5)

A plurality of keys that rotate in opposite directions when the key is pressed and released; and
A plurality of hammers that are provided for each key and that rotate in a direction corresponding to the rotation direction of the key as the corresponding key rotates.
A stationary mounting member;
An elastic member provided on one of the hammer and the mounting member;
Provided on the other of the hammer and the mounting member, engages with the elastic member during the rotation of the hammer, elastically deforms the elastic member, and then disengages from the elastic member before the key depression ends Engaging portions arranged as follows:
With
The elastic member has a sheet-like elastic member side engaging portion ,
The elastic member side engaging portion has first and second engaging surfaces respectively provided on one and the other of the front surface side and the back surface side,
The engagement portion includes a first engagement surface for engaging the first engagement surface of the elastic member-side engaging portion when depressed the key, the elastic member side engagement portion during key release of the key A second engagement surface that engages with the second engagement surface of
The elastic member side engagement portion and the first engagement surface of the engagement portion are formed so as to be in surface contact with each other at an angle substantially orthogonal to the rotation direction of the hammer,
At least one of the elastic member side engaging portion and the second engaging surface of the engaging portion is an oblique tangent in order to make it easy to disengage from the other with respect to the rotation direction of the hammer. A keyboard device for an electronic keyboard instrument, characterized in that the keyboard device comprises an inclined surface or a curved surface that contacts the other second engagement surface in the direction. During the rotation of the hammer when pressing the key,
The engagement portion engages with the elastic member side engagement portion at a predetermined first rotation angle,
2. The key switch according to claim 1, further comprising a key switch for detecting key pressing information of the key for generating a performance sound when pressed by the hammer at a predetermined second rotation angle. Electronic keyboard instrument keyboard device. The said engaging part is provided for every said hammer, The said elastic member side engaging part is provided so that it may extend in the row direction over several said hammers, The Claim 1 or 2 characterized by the above-mentioned. A keyboard device for electronic keyboard instruments. The engaging portion and the elastic member side engaging portion are more than a reaction force from the elastic member side engaging portion that is generated when the engaging portion is engaged during rotation of the hammer during key pressing. The reaction force from the elastic member side engaging portion generated when the engaging portion is engaged during rotation of the hammer at the time of key release is configured to be small. A keyboard device for an electronic keyboard instrument according to any one of 1 to 3. The engaging portion is provided on the hammer, and the elastic member is provided on the mounting member, respectively.
The attachment member has a support surface for supporting the elastic member facing the side on which the engaging portion is positioned before key pressing,
The elastic member is fixed at the base end,
The elastic member-side engaging portion extends along the support surface, and a distal end portion with which the engaging portion engages is disposed so as to protrude beyond the support surface. A keyboard device for an electronic keyboard instrument according to any one of 1 to 4.

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