JPH07271351A - Keyboard musical instrument - Google Patents

Abstract

PURPOSE:To equalize the angle of rotation of a hammer in a normal musical performance to that in a string nonstrike musical performance and to obtain the same key touch feeling with the normal musical performance at the time of the string nonstrike musical performance. CONSTITUTION:A support rail 7 is divided into a fixed support rail 7A and a movable support rail 7B, and a support 13 is arranged on the movable support rail 7B. When the normal musical performance state is switched to the string nonstrike musical performance state by horizontally moving the movable support rail 7B forward, the support 13 moves forward and a hammer assembly 14 is lowered. Consequently, the distance between a hammer 38 and strings 3 is made larger than that in the normal musical performance. A stopping means 91 arranged between the strings 3 and hammer assembly 14 stops a hammer shank 25 from rotating in the string nonstrike musical performance right before the hammer 38 strikes the strings 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard instrument having an action mechanism that works in conjunction with a keyboard and strikes a string. The present invention relates to a keyboard instrument in which rotation of a hammer is stopped and non-string striking performance in which a string is not hit can be selectively switched.

[0002]

2. Description of the Related Art In a keyboard musical instrument such as a grand piano or an upright piano that strikes a string with an action mechanism that operates in conjunction with a key depression operation on a keyboard, the playing volume is high, so the playing volume is selectively lowered. It is equipped with a sound reduction mechanism. In the case of a grand piano, this weak sound mechanism is designed to weaken the performance sound by moving the entire action mechanism together with the keyboard reed in the direction of parallel arrangement of the keyboard by a pedal operation, and reducing the number of strings hit by the hammer.

Recently, with the diversification of musical instruments, a keyboard musical instrument has been proposed which completely prevents the string striking sound, as described in US Pat. No. 2,250,065. This keyboard instrument is a grand piano, in which the hammer assembly hits the strings by pre-lifting the hammer assembly during non-strike performance that does not generate string striking sounds and preventing the jack from pushing up the hammer assembly during key depression. In other words, it is possible to realize a performance that does not generate a string-striking sound (silent performance). In addition, by incorporating sensors such as key sensors and hammer sensors used in automatic playing pianos into such keyboard musical instruments, you can enjoy the performance of a natural piano during normal performance that does not mute (including when playing weak sounds). Therefore, the user can enjoy the performance of the electronic piano in which the tone control circuit is controlled by the sensor to generate an electronic sound during the non-string striking performance.

[0004]

However, in the keyboard instrument according to the above-mentioned US Pat. No. 2,250,065, the hammer assembly is preliminarily lifted and held in a position not interlocking with the keyboard during the non-string striking performance. Even if the key is operated, the jack does not push up the hammer assembly, and since there is no step for the jack to escape from the hammer assembly, the touch feeling on the keyboard is significantly lightened, and the key touch feeling during normal performance cannot be obtained. was there.

Therefore, as a method of solving such a problem, the present applicant does not prevent the hammer from striking strings during normal playing, but prevents the hammer shank from rotating immediately before the hammer strikes during non-striking performance. Proposed a keyboard instrument having a blocking means (see Japanese Patent Application No. 4-174813).
issue).

However, in such a keyboard instrument, there is a problem that the touch of the key must be sacrificed to some extent. That is, in order to prevent the string striking sound from being completely generated, the distance between the hammer and the string at the time when the rotation of the hammer is stopped by the blocking means is
Considering the bending of the member, for example, about 5 to 10 mm is necessary. In other words, the distance between the hammer and the string is 5 to 5.
A blocking means was provided so as to block the rotation of the hammer when approaching up to about 10 mm. At this time, the "approach" of the hammer (the minimum value of the distance between the striking surface of the hammer and the strings when the keyboard is pushed down at a very low speed) is the same as that of the conventional piano (3 mm in the low range, 2. 5 mm, high range 2 mm), before the jack escapes from the lower part of the hammer roller (bat in the case of an upright piano), the hammer roller is pinched and stopped by the jack and the blocking means, so that it is like a piano. You will not be able to play (for example, repeatedly hit). In order to prevent this, it is necessary to shorten the distance between the protrusion and the regulating button and adjust the escape timing of the jack early so that the approach of the hammer is wider than usual, for example, 10 mm or more. Then, the touch of the key will feel a little shallow. Further, because the energy supplied to the hammer roller of the jack is reduced due to the early escape, the impact force of the hammer at the time of normal performance is also weakened, and the timbre of the string striking becomes slightly soft. Therefore, the applicant usually inserts a spacer between the regulating button and the small jack in such a non-string striking performance to cause the jack to escape from the normal performance in the non-string striking performance. We proposed a keyboard instrument that can be switched between playing and non-string playing (Japanese Patent Application No. 4-
215400). In such a case, since the escape time is early, the feeling of touch changes between the normal performance and the non-string striking performance. Also, on a normal keyboard instrument, the hammer returns (the hammer returns slightly when Jack escapes:
If it is large (normally adjusted to about 2 mm from the approach point), the jack will not return smoothly and the continuous hitting performance will deteriorate, so the return of the hammer is adjusted by adjusting the drop screw. However, in the above-described keyboard instrument that is set to escape earlier than during normal playing, the drop screw is not adjusted even when switching between normal playing and non-string playing. There was a problem that it was not possible to optimize both the return of the hammer at the time and the return at the time of non-strike performance.
Therefore, the present applicant further configures the shelf board in the keyboard musical instrument having the above-mentioned blocking means by the fixed shelf board and the movable shelf board so that the movable shelf board is horizontally arranged from the normal playing position during non-string striking performance. We proposed a keyboard instrument that is lowered to move the action mechanism away from the strings so that the rotation angle of the hammer is the same during normal playing and non-string playing (Japanese Patent Application No. 4).
-279470). However, in such a structure, there is a problem in that the structure has to be complicated.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and the purpose thereof is to move the action mechanism itself to increase the distance between the hammer and the strings. The hammer's turning angle (the turning angle until the jack escapes) can be made the same during normal playing and non-string striking, and the jack escapement timing can also be made approximately the same. , It is to provide a keyboard instrument that can switch between normal performance and non-strike performance with a simple configuration without disturbing the touch of the keys.

[0008]

In order to achieve the above object, the invention according to claim 1 is a hammer assembly for striking a string, a jack for pushing up the hammer assembly during a string striking operation, and a hammer for jacking in the middle of a string striking operation. A support rail to which a support for the action mechanism is attached in a keyboard instrument that has an action mechanism that consists of a regulating button that escapes from the assembly, etc. and a hammer strikes the strings by operating in conjunction with the key depression operation of the keyboard Is arranged so as to be movable back and forth with respect to the action bracket, and does not prevent the hammer from striking the string during normal playing, and blocks the rotation of the hammer assembly immediately before the hammer strikes the string when not striking. Means are provided. The invention according to claim 2 comprises a hammer assembly for striking a string, a jack that pushes up the hammer assembly during a string striking operation, a regulating button that causes the jack to escape from the hammer assembly during a string striking operation, and the like. In a keyboard instrument having an action mechanism in which a hammer strikes a string by operating in conjunction with an operation, the hammer does not prevent the hammer from striking the string during normal playing, and immediately before the hammer strikes the string when not hitting the string. A support means for preventing rotation of the hammer assembly is provided, and a support rail to which the support of the action mechanism is attached is composed of a movable support rail and a fixed support rail, and the movable support rail holds the support. It is arranged to be movable back and forth with respect to the fixed support rail. And characterized in that it is moved forward from the normal play time of non-string-striking performance by the operation means. According to a third aspect of the present invention, in the invention according to the first or second aspect, the distance between the protrusion provided on the small jack of the jack and the regulating button is a non-string striking performance than a normal performance. Is characterized by being larger.

[0009]

In the inventions of claims 1 and 2, the blocking means does not block the rotation of the hammer assembly during normal playing, but blocks the rotation of the hammer assembly immediately before the hammer hits the string during non-string playing. To do. When the hammer assembly is prevented from rotating by the blocking means, it does not hit the strings, but the blocking means abuts the hammer assembly to impart a force equivalent to the weight of the hammer assembly to the hammer assembly. The support of the action mechanism is moved forward (on the player's side) from the position during normal performance during non-string striking performance. Since the repetition lever is mounted on the support with a required angle inclined backward and downward, when the repetition lever moves in the forward direction together with the support, the hammer roller lowers accordingly, increasing the distance between the hammer and the strings. That is, when the support moves forward by, for example, 2 to 3 mm, the repetition lever also moves forward by the same distance. The distance that the hammer descends is determined by the ratio of the distance from the center of rotation of the hammer shank to the hammer roller and the length from the center of rotation of the hammer shank to the center line of the hammer. If this ratio is, for example, about 1: 7, when the hammer roller is lowered by about 1 mm, the hammer is lowered by about 7 mm, and as a result, the distance between the hammer and the string is enlarged by about 7 mm as compared with the normal performance. Therefore, even when the hammer is stopped about 10 mm in front of the string (approaching +7 mm during normal playing) by the blocking means during non-string striking performance, the turning angle of the hammer can be set to the same as during normal playing. Also, Jack moves with the support. The rising speed of the protrusion is the rotation fulcrum of the support and the force point (the intersection of the straight line connecting the rotation fulcrum of the support and the tip of the protrusion and the perpendicular of the capstan).
Distance, and the fulcrum of the support and the point of action (tip of the protrusion)
It is determined by the ratio of the distances. Here, when the support is moved, this ratio changes, and the ascending speed of the protrusion becomes higher in the non-string striking performance than in the normal performance. If the regulating button is tilted backward like the conventional piano, the small protrusion of the jack will come into contact with the lower side of the regulating button when the support moves during non-string playing. In addition to shortening the distance between the tip of the protrusion and the regulating button, the rising speed of the jack also increases, causing the escape start timing of the key stroke (the timing at which the small protrusion of the jack contacts the regulating button). ) Is faster during non-string striking than during normal performance. Therefore, if the mounting angle of the regulation button is changed and the distance between the regulation button during non-string striking performance and the small jack projection is set to be larger than the distance during normal performance as in claim 3, the projection It is possible to cancel the influence of the increase in the ascending speed of, and to make the escape start timing in the key stroke the same in the normal performance and the non-striking performance.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a side sectional view of an action mechanism section during normal playing showing an embodiment in which the present invention is applied to an automatically playable grand piano, and FIG. 2 is an enlarged side sectional view of an essential part during non-string striking performance. is there. In these figures, a keyboard reed 2 is provided on a shelf 1 forming the bottom surface of the instrument body, and a white key 4A corresponding to each pitch string 3 is provided on the keyboard reed 2. The keyboard 4 of all 88 keys consisting of the black key 4B and the black key 4B is disposed with its substantially central portion supported by a balance key pin 5 so as to be vertically swingable. The keyboard reed 2 is
It integrally has a reed front 2a, a reed middle 2b, and a reed rear 2c which are arranged so as to extend commonly to all the keyboards 4, and the keyboard 4 swings the balance key pin 5 on these reeds. It is vertically movable as a fulcrum. The balance key pin 5 is erected on the reed inside 2b. And
The keyboard reed 2 is moved in the left-right direction, that is, in the side-by-side direction of the keyboard 4 by depressing a shift pedal (not shown) provided at the bottom of the musical instrument main body when switching between the normal playing state and the low-pitched playing state. It is configured.

The strings 3 are stretched substantially horizontally with a predetermined tension by locking both ends of a tuning pin and a frame pin (not shown) on a frame 6 arranged above the keyboard 4. Below the strings 3, a support rail 7 that extends in common for all strings 3 is located above the rear end of the keyboard 4 and extends transversely. The support rail 7 is linked to the keyboard 4 and interlocks with the keyboard 4. An action mechanism 8 for striking the corresponding string 3 is arranged, and a damper mechanism 9 for blocking the free vibration of the normal string 3 and releasing the string 3 at the time of striking the string 3 is arranged behind it. .

The support rail 7 is composed of a fixed support rail 7A and a movable support rail 7B, each of which is formed of an extruded shape material such as an aluminum alloy by being formed in two parts. Fixed support rail 7A
Is a plurality of, for example, 3 to 4 action brackets 10 arranged in parallel in the arrangement direction of the keyboard 4 on the keyboard reed 2 via an action stand (not shown), and a set screw 11 is provided on the upper surface of the rear end portion of the action bracket 10.
All the action brackets 10 are connected by being installed and fixed substantially horizontally by. On the other hand, the movable support rail 7B is movable back and forth, and is arranged at an appropriate distance, for example, 2.5 mm, behind the fixed support rail 7B in the normal playing state shown in FIG. It is configured to come into contact with the fixed support rail 7A as shown in FIG. A shank rail 12 extending in a transverse manner so as to extend commonly to all the keyboards 4 is fixed to the upper surface of the front end portion of each action bracket 10 in common.

The action mechanism 8 has a support 13 that is rotated by a key depression operation of the keyboard 4, a hammer assembly 14 that strikes the strings 3, and a support 13 that moves up with the key depression operation to push up the hammer assembly 14. A jack 15 for rotating, a repetition lever 16 for receiving the hammer assembly 14 after the string striking operation, and returning the jack 15 under the hammer roller 26.
The jack 15 is composed of a regulating assembly 17 for temporarily escaping from the hammer assembly 14 when striking a string.

The support 13 includes a support flange 18 fixed to the movable support rail 7B, and a base end (rear end) of the support flange 18 which is rotatably supported in the vertical direction via a pin. A support heel 13A that is integrally provided on the lower surface on the (front end) side is placed on a capstan 19 that is planted on the upper surface of the rear end portion of the keyboard 4 so that it is normally held substantially horizontally. Further, a hammer shank stop felt 20, which receives the hammer shank 25 of the hammer assembly 14 that returns after the string striking operation, is arranged on the upper surface of the base end portion of the support 13 via a support-attached tree 21.

The jack 15 is bent in an L-shape when viewed from the side, and a bent portion at the lower end thereof is pivotally supported in the front end of the support 13 via a pin 22 so as to be rotatable in the front-rear direction, and a repetition spring 23. As a result, the habit of turning counterclockwise in FIG. 1 is imparted. A large jack 15A extending upward from the jack 15 is inserted from below into a long hole 24 formed through the upper and lower surfaces of the front end portion of the repetition lever 16 and the upper end surface thereof is the hammer. It is in contact with the lower surface of the hammer roller 26 arranged on the lower surface of the shank 25 on the base side. On the other hand, a small jack 1 that extends substantially horizontally toward the front of the jack 15.
5B has a front end located below the regulating assembly 17 and serves as a turning power point at the time of escape.
7 is integrated. Then, the jack 15 has a repetition button 28 attached to an intermediate portion of the large jack 15A and a repetition button 23 attached to a jack stop spoon 29 in which a repetition button 28 is planted on the support 13.
By being normally pressed by the spring force of, the counterclockwise rotation is restricted and held in the initial position.

The repetition lever 16 is rotatably supported in the vertical direction in the central portion via a center pin 32 at the upper end of a repetition lever flange 31 protruding from the substantially central portion of the support 13. The repetition spring 23 imparts the habit of turning counterclockwise in FIG. At the rear end of the repetition lever 16, a repetition lever button 33, which is normally pressed against the upper surface of the support 13 on the base side by the spring force of the repetition spring 23, is provided, which allows the rotation of the repetition lever 16 in a counterclockwise direction. It restricts movement and locks in the initial position. In this state,
The repetition lever 16 is inclined downward to the left in FIG. 1 by a required angle (about 25 °) so that the rear end side is located below the front end side.

The hammer assembly 14 includes a hammer shank 25 having a rear end rotatably pivoted vertically through a pin at the rear end of a shank flange 36 fixed to the upper surface of the shank rail 12. , The hammer wood 3 arranged at the free end of this hammer shank 25
Hammer 3 consisting of 8A and hammerhead 38B
8 and the hammer roller 26 and the like disposed on the lower surface of the proximal end portion of the hammer shank 25. Normally, the hammer roller 26 is placed on the upper surface of the front end portion of the repetition lever 16 so that the initial position Is locked to. In this state, the turning distance of the hammer 38, that is, the distance D from the upper surface of the hammer head 38B to the string 3
Is set to 47.5 mm.

In the normal playing state shown in FIG. 1, the keyboard 4
When the support 13 is pushed up by the capstan 19 and rotates upward in the counterclockwise direction in response to the key depression operation of the jack, the jack 15 pushes up the hammer roller 26 from below and rotates the hammer assembly 14 upward in the clockwise direction. The hammer 38 strikes the string 3 corresponding to the pressed keyboard 4. Jack 15
Is rotated clockwise against the repetition spring 23 by the protrusion 27 coming into contact with the regulating assembly 17 and preventing its upward movement, whereby the upper end of the jack 15 is pushed downward from the hammer roller 26. Escape temporarily. The escape timing of the jack 15 is 2 to 3 when the hammer 38 moves to the string 3 during a normal performance, similar to the approach of a hammer in a normal grand piano.
It is considered to have come close to mm.

After the striking operation, the hammer assembly 14 is returned to rotate by the repulsive force of the string 3 and its own weight.
Is returned to the initial position by the hammer roller 26 being received by the repetition lever 16. At this time, the repetition lever 16 is rotated clockwise around the center pin 32 against the repetition spring 23 by the impact of the hammer assembly 14 dropping, thereby absorbing and relaxing the impact of the hammer roller 26. It prevents bounces and enables quick consecutive hits with the same key. Further, the jack 15 is returned to rotate in conjunction with the downward movement of the support 13 accompanying the return operation of the keyboard 4 after the string striking operation by the hammer 38, so that the upper end thereof enters the lower part of the hammer roller 26 again, and Enables string striking action.

The regulating assembly 17 is
The shank rail 12 has a 88-key action mechanism 8 grouped into a plurality of action mechanisms, and is provided with a regulating rail 40 extending transversely to each of a plurality of sections and a protrusion 27 of each jack 15. And a plurality of regulating buttons 42 disposed on the lower surface side of the regulating rail 40 via a regulating screw 41 (FIG. 2). The distance d (FIG. 1) between the regulating button 42 and the protrusion 27 is set such that the jack 15 escapes from the lower portion of the hammer roller 26 when the hammer 38 approaches the string 1 by about 2 to 3 mm during normal playing. It is set. When the regulating button 42 is turned, the regulating button 42 moves up and down to finely adjust the distance d. When the distance d is increased, the escape timing of the jack 15 is delayed, and when the distance d is decreased, it is accelerated.

On the upper surface of the rear end portion of the keyboard 4, a back check 43 which elastically receives the hammer 38 which is pivotally returned by the repulsive force of the string striking string 3 and the weight of the hammer assembly 14 is provided via a back check wire 44. Are arranged. A drop screw 45 is attached to the lower surface of the hammer shank flange 36 to adjust the return of the hammer 38 when the jack 15 escapes.

The rear end of the damper mechanism 9 is rotatably supported by a damper lever flange 51 provided on a damper lever rail 50 so as to be vertically rotatable, and the front end extends above the rear end of the keyboard 4. The damper lever 53 and the damper block 5 arranged on the front end side of the damper lever 53
4 and the damper wire 55 to the damper block 54
It is composed of a damper 56 and the like arranged via
The damper 56 normally presses the string 3 from above to prevent free vibration of the string 3, and the damper lever 53 is rotated counterclockwise in FIG. Then, it is configured to rise and separate from the string 3. Then, after separating the damper 56,
The hammer 38 strikes the strings 3 to enable normal performance.

The string-striking operation of the action mechanism 8 during the non-string-striking performance is substantially the same as that in the above-described normal performance. However, during non-string playing, the movable support rail 7B is horizontally moved forward by a predetermined distance (about 2 to 2 mm) and abutted and locked to the fixed support rail 7A, so that the normal performance shown in FIG. The state is switched to the non-string playing state shown in FIG. When the movable support rail 7B moves, the support 13, the jack 15, and the repetition lever 16 naturally move together with the movable support rail 7B. Here, since the repetition lever 16 is disposed above the support 13 in a state in which it is inclined rearward and downward at an angle of approximately 25 ° as described above, when the repetition lever 16 moves forward together with the support 13, the hammer roller 26 The position at which the abuts on the repetition lever 16 is lowered by about 1 mm. Therefore, the hammer assembly 14 is also lowered, and the distance between the hammer 38 and the string 3 is increased from D to D '. The distance that the hammer 38 descends is from the rotation center A of the hammer shank 25 to the hammer roller 2
6 and the ratio of the length from the rotation center A of the hammer shank 25 to the center line L of the hammer 38. If this ratio is, for example, about 1: 7, when the hammer roller 26 is lowered by about 1 mm, the hammer 38 is lowered by 7 mm, so that the distance between the hammer 38 and the string 3 is 4 mm.
Expand from 7.5 mm to 54.5 mm. As a result, even when the hammer 38 is stopped 7 to 10 mm before the string 3 by the blocking means which will be described later in the non-string striking performance, the turning angle of the hammer 38 can be set to the same as that in the normal performance.

In this case, if the hammer assembly 14 is lowered by switching from the normal playing state to the non-string playing state,
In the initial state, the hammer shank 25 may come into contact with the hammer shank stop felt 20, and the hammer wood 38A may come into contact with the back check 43. Therefore, the hammer shank stop felt 20 is made smaller than an ordinary piano, and the back check 43 is made smaller. It is low.

If the support 13 is moved forward by switching from the normal playing state to the non-string playing state, the protrusion 2
7 also moves forward, and the contact position with the lower surface of the regulating button 42 shifts forward. The rising speed of the protrusion 27 is the distance between the rotation fulcrum B of the support 13 and the force point (the intersection C between the straight line connecting the rotation fulcrum B of the support 13 and the tip (F) of the protrusion 27 and the perpendicular of the capstan 19). , Support 13
It is determined by the ratio of the distance between the rotation fulcrum B and the action point F (the tip of the protrusion 27). Here, when the support 13 is moved forward, this ratio changes, and the ascending speed of the protrusion 27 becomes higher in the non-string striking performance than in the normal performance. If the regulating button 42 is inclined rearward by about 80 ° like the conventional piano, the lower surface of the regulating button 42 is inclined downward to the right in FIG. By moving forward, the protrusion 27 comes into contact with the front side of the lower surface of the regulating button 42. Therefore, the distance d (FIG. 1) between the protrusion 27 and the regulating button 42 becomes shorter than that during the normal performance, and as described above, the rising speed of the protrusion 27 increases. As a result, the escape start timing (the timing at which the protrusion 27 contacts the lower surface of the regulating button 42) in the key stroke is earlier in the non-string striking performance than in the normal performance, and the key touch feeling is the same as in the normal performance. It will be different. In view of this, in the present invention, the regulating button 42 is arranged so as to be inclined forward by a required angle as opposed to the conventional piano, and the lower surface of the regulating button 42 is inclined to the lower left as shown in FIG. In this way, the distance d ′ between the regulation button 42 and the protrusion 27 during the non-string striking performance becomes larger than the distance d during the normal performance, so that the effect of increasing the rising speed of the protrusion 27 is offset, The escape start timing in the key stroke can be set to be the same in the normal performance and the non-striking performance. The angle at which the regulating button 42 is tilted is determined according to the amount of movement of the movable support rail 7B, the position of the rotation fulcrum B, the force point C, and the point of action F.

Next, the structure of the support rail 7 and the operation means of the movable support rail 7B will be described in detail with reference to FIGS. FIG. 3 is a side sectional view of the support rail, and FIG.
Is a partially broken perspective view of the movable support rail, FIG. 5 is a perspective view of the movable support rail and its operating means, and FIG. 6 is a perspective view of a main part of the fixed support rail. In these drawings, the fixed support rail 7A includes a rectangular tubular portion 7A-1 having a square-shaped cross section and a substantially horizontal plate portion 7A- continuously provided on the lower end of the back surface of the rectangular tubular portion 7A-1. 2 are integrally provided, and block-shaped bearing members 60 are fixed to the upper surface of the square tubular portion 7A-1 at positions corresponding to the action brackets 10 by set screws 61, respectively. The bearing member 60 has a bearing hole 62 that is opened in the front and rear surfaces, and a connecting shaft 63 that movably connects the movable support rail 7B to the fixed support rail 7A is slidably inserted into the bearing hole 62. The connecting shaft 63 is the head 6 provided at the front end.
The backward movement is prevented by 3a, and a male screw portion 63b is provided at the rear end. The plate portion 7A-2 is fixed by a setscrew 11 on a rail mounting portion 10A provided on the upper surface of the rear end portion of the action bracket 10.
The rear end of the plate portion 7A-2 appropriately protrudes (2 to 3 mm) behind the rail mounting portion 10A.

The movable support rail 7B is formed in a U-shape when viewed from the side, so that the vertical plate portion 7B-1 and the upper and lower portions of the vertical plate portion 7B-1 that are opposed to each other at the upper and lower end portions of the vertical plate portion 7B-1 on the front surface side. The horizontal plate portions 7B-2 and 7B-3, and the metal plate mounting portion 7B-4 near the lower back surface of the vertical plate portion 7B-1.
Are projected integrally. The lower horizontal plate portion 7B-3 is formed discontinuously to avoid the action bracket 10. A shaft support metal fitting 64 is disposed on the metal fitting mounting portion 7B-4 so as to correspond to each connecting shaft 63, and is closely fixed to the back surface of the vertical plate portion 7B-1 by a set screw 65. The upper end portion of the shaft support metal fitting 64 is the upper horizontal plate portion 7B-2.
The male screw portion 63b of the connecting shaft 63 is screwed and connected to this protruding portion. Further, as shown in FIG. 5, a pair of left and right plates 66 (66A, 66B), which are long in the front-rear direction, are provided on both sides of the movable support rail 7B. It is fixedly provided by a set screw 67. Operating means 70 is connected to the front end of each plate 66 to move the movable support rail 7B back and forth to switch the action mechanism 8 between a normal playing state and a non-string playing state.

The operating means 70 includes an operating lever 72 (FIG. 1) arranged via a holder 71 at an appropriate position on the lower surface of the front end portion of the shelf board 1, and the operating lever 72 and the plates 66A, 66B. Two wires 73 (73 to connect)
a, 73b) and the like. Each wire 73
a and 73b are slidably inserted into a flexible tube 74 having wire cases 75 attached to both ends,
Both ends thereof protrude from the wire case 75, and one end (end of the movable support rail) of each plate 66A,
It is locked to a connecting portion 77 provided at the front end of 66B, and the other end (end on the operation lever side) is connected to the operation lever 72. The connecting portion 77 is composed of a bent piece 78 provided at the front end of the plate 66 and a metal fitting 79 provided opposite to the front surface of the bent piece 78, and the long groove 8 is formed on the outer edge of the bent piece 78.
0 is formed. The metal fitting 79 has a bent piece 78 at the upper end.
And a lower end portion thereof is bent backward in an inverted L shape and fixed to the front surface of the bent piece 78 by a set screw 81. One end of the wire 73 is inserted into the long groove 80 of the bent piece 78, and a disc provided at the tip thereof,
The locking portion 82 formed of a ball or the like is provided with the bent piece 78 and the metal fitting 7.
By being inserted between 9 and 9, it is connected and locked to the connecting portion 77. The tube 74 is bent in a U shape, and the wire case 75 is provided at one end thereof.
As shown in FIG. 5, (75A, 75B) and the vicinity thereof are connected to a bending column (or side plate) (not shown) of the main body of the keyboard musical instrument by Ω.
The wire case 75A is fixed to the holder 71, and the other end of the wire case 75A is fixed to the holder 71 by being fixed by the mold fixtures 83.

In such a structure, the operation lever 72
When is manually moved back and forth, the movable support rail 7B is moved back and forth, and the action mechanism 8 can be switched from the normal playing state to the non-string playing state or vice versa. When switching from the normal playing state to the non-string playing state, the operation lever 72 may be pushed in until it comes into contact with the holder 71. Then, one end of the wire 73 moves forward, and the locking portion 82 presses the metal fitting 79 from the rear, so that the plate 66 moves forward. Therefore, the movable support rail 7B also moves forward to move the support 13 to the non-string-striking performance position shown in FIG. The movable support rail 7B is stopped by coming into contact with the fixed support rail 7A, and the movement amount is set to 2 to 3 mm as described above. On the other hand, when switching from the non-striking performance state to the normal performance state, contrary to the above, the operation lever 72 is pulled forward to move the movable support rail 7B.
Should be moved backward for a predetermined distance.

1 and 2, in the space between the strings 3 and the action mechanism 8, a device for enabling non-string-striking performance that does not generate string-striking sound, that is, a silencer 90 is provided. The muffler 90 does not prevent the hammer 38 from striking strings during normal playing, and the hammer shank 25 immediately before the hammer 38 strikes strings during non-stringing performance.
There is provided a blocking means 91 for blocking the rotation of the, and a switching means 92 for switching the blocking means between the normal playing state and the non-string playing state.

As shown in FIGS. 7 and 8, the blocking means 91 is divided into two parts on the low-pitched sound side and the middle and high-pitched sound side.
Between the hammer shank 25 and the hammer shank 25
Two rotating shafts 94 (94A, 94B) are provided, and buffer members 96 are fixed to the peripheral surfaces of these rotating shafts 94A, 94B via a buffer base 95, respectively. The low-pitched rotary shaft 94A is rotatably supported via a bearing (neither is shown) to a mounting bracket whose one end is fixed to the lower-pitched inner side surface of the bending column 100 that constitutes the side surface of the musical instrument body. The other end is also rotatably supported by a bearing mounting bracket 102 fixed to the tengu nose 101 of the frame 6 (FIG. 1) via a bearing 103, and an intermediate portion is formed on the lower surface and the middle of the frame 6. It is rotatably supported by a holding member arranged on the frame 104 (FIG. 1) via a bearing cloth (neither is shown). Similarly, the middle and high-pitched rotary shafts 94B have one end rotatably supported by the bearing mounting bracket 102 via a bearing 105 and the other end fixed to the high-pitched inner surface of the bending column 100. Rotatably rotatably supported by the attached mounting bracket 106 via a bearing 107, and an intermediate portion is rotatably supported by a holding member disposed on the frame 6 and the intermediate frame 104 via a bearing cross (neither is shown). Is supported by.

A buffer table 95 is attached to each of the rotating shafts 94A and 94B.
The cushioning member 96 disposed via the first cushioning member 96A and the second cushioning member 96A having different elastic moduli as shown in FIG.
The cushioning material 96B and the protection material 96C such as leather or resin film that covers the second cushioning material 96B are laminated and fixed. As the material of the buffer table 95, wood, aluminum alloy, iron or the like is used.

The switching means 92 for switching the blocking means 91 between the normal playing state and the non-string playing state is the shelf board 1
A knob 111 disposed via a holder 110 at an appropriate position on the lower surface of the front end portion of FIG. 1 and two wires 112 (112A, 1) that connect the knobs 111 to the rotary shafts 94A, 94B.
12B) and the like. High side (same for low side)
As shown in FIG. 7, one end of the wire 112A is attached to the knob 111, and the other end of the wire 112A is detachably attached to a metal fitting 113 provided on the inner surface of the bending column 100 on the high tone side. The case 114 is slidably held, and its tip is connected to a wire connecting plate 115 disposed on the high-pitched rotary shaft 94B.

In the normal playing state, the rotating shafts 94A and 94B are such that the cushioning member 96 is directed toward the front of the action mechanism 8 as shown by the solid line in FIG. 1 and the lower surface is located above the lower surface of the pin plate 116. In this state, the cushioning member 96 is attached to the hammer shank 25.
It is located above the range of motion. Therefore, even if the action mechanism 8 is rotated by the key depression operation of the keyboard 4, the hammer shank 25 does not come into contact with the blocking means 91 and is not blocked from rotating, so that the hammer 38 can strike a string. . When the knob 111 is pulled to the player side from this state to switch to the non-striking performance state, the rotary shaft 94A,
94B is rotated substantially 90 ° in the clockwise direction in FIG. 8 to direct the cushioning member 96 vertically downward as shown in FIG. 2 and move it within the range of motion of the hammer shank 25. Therefore,
Even if the action mechanism 8 is operated in conjunction with the key pressing operation and the hammer assembly 14 is rotated upward, the hammer shank 25 abuts the buffer member 96 of the blocking means 91 in the middle thereof and blocks further rotation. Therefore, the hammer 38 does not strike the strings 3 and enables a non-string playing in which no string-striking sound is emitted. At this time, the height of the lower surface of the buffer member 96 is equal to that of the hammer 3.
The height at which the hammer shank 25 abuts when 8 rotates by the same rotation angle as in the normal performance, in other words, the rotation distance (47.5) of the hammer 38 in the normal performance and the non-striking performance.
mm) are set to be equal to each other, so that the escape time of the jack 15 in the non-striking performance can be made the same as that in the normal performance. If the blocking means 91 is disposed between the inner surfaces of the bending column 100 and the cushioning member 96 is positioned above the lower surface of the pin plate 116 in the normal playing state, the keyboard 4 and the action are adjusted for adjustment. When pulling out the mechanism 8 together with the keyboard reed 2 from the main body of the musical instrument, it does not get in the way.

In the present embodiment, the operation means 70 of the movable support rail 7B and the switching means 92 of the blocking means 91 are operated separately and independently.
It is also possible to interlock. In that case, the wires 73, 112 of both means 70, 92 are provided by suitable locking means.
The wires 73 and 112 may be bound together, and either the operation lever 72 or the knob 111 may be operated to simultaneously operate both wires 73 and 112. Further, only one of the operating lever 72 and the knob 111 may be provided, and the wire 73 and the wire 111 may be connected to this, so that the blocking means 91 and the switching means 92 may be interlocked. However, in the present embodiment, when the operation lever 72 is pushed, a non-striking performance state is set, and when the knob 111 is pulled to the front, it is switched to a non-striking performance state.
It is necessary to make the operating directions of the knob 111 and the knob 111 the same. Further, the operation means 70 and the switching means 92 are not limited to those using wires, and various changes can be made. For example, the movable support frame 7 can be operated by pedal operation.
Of course, B and the rotating shaft 94 may be directly operated, or may be operated by a drive motor, a solenoid, or the like. When a drive motor is used, the rotation of the motor may be transmitted to the movable support frame 7B and the rotating shaft 94 by a gear or the like. In the case of a solenoid, a link may be used.

Referring again to FIGS. 1 and 2, 121 is a key sensor, and 122 is a key driving actuator used when used as an automatic piano. Key sensor 12
Reference numeral 1 designates a keyboard reed 2 corresponding to each keyboard 4, and a shutter 123 provided on the lower surface of the keyboard 4 blocks a light emitted from a light emitting element and received by a light receiving element when a key is pressed. Is configured to detect the movement of the keyboard 4. The detection output of the key sensor 121 is input to a musical tone control circuit (not shown). The tone control circuit operates according to the detected output, and causes the electronic sound source to generate an electronic sound. When the output signal of the key sensor 121 is recorded as a performance information signal on a recording medium such as a floppy disk, the actuator 122 can automatically perform the performance. The actuators 122 are arranged in a staggered manner at the rear end of the shelf board 1 so as to correspond to the respective keyboards 4, and the plungers 122a thereof closely face the lower surface of the rear end of the corresponding keyboard 4. When performing an automatic performance, in a normal performance state shown in FIG. 1, when a prerecorded performance information signal is reproduced and the actuator 122 is selectively driven by the electric signal, the plunger 122a corresponds to the keyboard corresponding to the actuator. Since 4 is pushed up, the keyboard 4 can be operated as if the player performed a key depression operation with a finger. In addition,
Such a key sensor 121 and actuator 12
2 is Japanese Patent Laid-Open No. 59-24894, Japanese Utility Model Publication 3-105
It is publicly known as disclosed in Japanese Patent Publication No. 50, etc.

Thus, in the grand piano having such a structure, when the support 13 is moved forward by the movement of the movable support rail 7B at the time of non-striking performance,
The hammer assembly 14 is lowered, and the striking distance can be increased. Further, by moving the support 13 forward, the ascending speed of the jack 15 becomes faster than that during normal playing, and the protrusion 27 and the regulating button 4 are also provided.
Although the distance from 2 is shortened and the escape start timing of the jack 15 is advanced, in the present invention, the regulating button 42 is tilted to the right in FIG.
Since the distance between 7 and the regulating button 42 is made long, the escape start timing of the jack 15 can be made substantially the same as that at the time of normal performance. Therefore, it is possible to make the key touch feeling during the non-string striking performance substantially the same as the key touch feeling during the normal performance. Further, since the turning angle of the hammer 38 is the same in the normal performance and the non-string striking performance, it is possible to optimize both the normal performance and the non-string striking performance. Furthermore, in the present invention, as shown in FIG. 1, a key sensor 121 is provided on the upper surface of the front end portion of the keyboard reed 2 corresponding to each keyboard 4, whereby the movement of the keyboard 4 is detected and the detection signal is used. Since the tone control circuit is controlled to generate an electronic sound from the electronic sound source, you can enjoy playing the electronic piano without damaging the touch feeling of the grand piano, and listen to the electronic sound at this time with headphones. Alternatively, if the speaker produces a low volume, it will not cause noise pollution to neighboring residents during the day or at night.

FIG. 9 is a perspective view showing another embodiment of the blocking means for blocking the striking of the hammer. In this embodiment, a blocking means 140 is arranged between the string 3 and the hammer assembly 14 so as to be movable in the keyboard installation direction. The blocking means 140 is one in which a plurality of cushion members 143 are arranged in parallel on the lower surface of the hammer shank stopper 142 whose both ends are supported by stays 141 at substantially the same pitch as the arrangement pitch (about 13 mm) of the action mechanism 8, When switching from the normal playing state to the non-string playing state or vice versa, the hammer shank stopper 142 together with the stay 141 is moved to the left or right by approximately half pitch for action splitting by an appropriate switching means such as an operating lever and a drive motor. The cushion member 143 relative to the hammer shank 25 during normal playing, and the cushion members 143 are moved to the hammer shank 25 during non-string playing.
It is configured to match and correspond to. Even in such a configuration, it is possible to switch between the normal performance and the non-string striking performance.

FIG. 10 is a side view showing still another embodiment of the blocking means. In this embodiment, a blocking means 150 for blocking the rotation of the hammer 38 during non-string striking is inserted between the string 3 and the hammer head 38B to block the striking of the string 3. The blocking means 150 is composed of a plate 151, a felt 152 fixed to the lower surface of the plate 151, and an appropriate switching means such as an operating lever for operating the plate 151 and a drive motor. It is possible to prevent the hammer 38 from hitting the string 3 by inserting the string between the string 3 and the hammer head 38B by parallel movement or rotation in the front-rear direction.

The present invention is not limited to the above-described embodiment, and various modifications and variations are possible. For example, as shown in FIG. 2, the muffler 160 is arranged directly below the string 3, If the string 38 is raised and moved in close contact with the string 3 by an appropriate means during a non-string striking performance, the string striking by the hammer 38 can be more reliably prevented. In the above embodiment, the support rail 7 is fixed to the support rail 7A.
The movable support rail 7B is divided into two parts, and the movable support rail 7B is configured to move back and forth.
Needless to say, it is also possible to move back and forth.

[0041]

As described above, in the keyboard instrument according to the present invention, the support rail to which the support of the action mechanism is attached is arranged so as to be movable back and forth with respect to the action bracket, and the string is struck by a hammer during normal playing. A blocking means was installed to prevent the hammer assembly from rotating immediately before the hammer hits the string when not hitting the string.Therefore, the support rail moves forward to move the support forward when not hitting the string. Then, the repetition lever also moves, so that the hammer assembly can be lowered, and the distance between the hammer and the strings, in other words, the turning angle of the hammer can be expanded more than that during normal playing. Therefore, even if the approach of the hammer is set to be larger than that during the normal performance, the rotation angle of the hammer can be set to be substantially the same as that during the normal performance. In this case, when the support moves forward, the jack moves together with the support and the distance between the protrusion and the regulating button is shortened. As a result, there arises a problem that the escape start timing (the timing at which the protrusion contacts the regulating button) in the key stroke becomes earlier in the non-string striking performance than in the normal performance. Therefore, in the present invention, by setting a large distance between the protrusion and the regulating button during the non-string striking performance, the effect of increasing the rising speed of the protrusion is offset, so that the escape in the key stroke is canceled. The start timing can be set to be the same for the normal performance and the non-striking performance. Therefore, it is possible to enjoy the normal performance and the non-string striking performance without impairing the touch feeling of the keys.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view of an action mechanism section during normal performance showing an embodiment in which the present invention is applied to a grand piano capable of automatic performance.

FIG. 2 is a side cross-sectional view of the main parts of the action mechanism section during non-string striking performance.

FIG. 3 is a side sectional view of a support rail.

FIG. 4 is a partially cutaway perspective view of a movable support rail.

FIG. 5 is a perspective view of the movable support rail and its operating means.

FIG. 6 is a perspective view of a main part of a fixed support rail.

FIG. 7 is a perspective view of a main part of the blocking means and its switching means.

FIG. 8 is a perspective view of an essential part showing the attachment structure of the blocking means.

FIG. 9 is a perspective view showing another embodiment of the blocking means.

FIG. 10 is a side view showing still another embodiment of the blocking means.

[Explanation of symbols]

1 ... Shelf board, 2 ... Keyboard reed, 3 ... String, 4 ... Keyboard, 7 ... Support rail, 7A ... Fixed support rail, 7B ... Movable support rail, 8 ... Action mechanism, 9 ... Damper mechanism,
10 ... Action bracket, 13 ... Support, 14 ...
Hammer assembly, 15 ... Jack, 25 ... Hammer shank, 25A ... Jack large, 25B ... Jack small, 27 ... Protrusion, 38 ... Hammer, 42 ... Regulatoring button, 70 ... Operating means, 91 ... Blocking means, 92 ... Switching means .

Claims (3)

[Claims] 1. A hammer assembly for striking a string, a jack for pushing up the hammer assembly during a string striking operation, a regulating button for allowing the jack to escape from the hammer assembly during a string striking operation, etc. In a keyboard instrument having an action mechanism in which a hammer strikes a string by operating the hammer, a support rail to which the support of the action mechanism is attached is arranged so as to be movable back and forth with respect to the action bracket, and the hammer is used during normal performance. A keyboard instrument that is provided with a blocking means for blocking the rotation of the hammer assembly immediately before the hammer strikes a string when not hitting a string. 2. A hammer assembly for striking a string, a jack for pushing up the hammer assembly during a string striking operation, a regulating button for allowing the jack to escape from the hammer assembly during a string striking operation, and the like. In a keyboard instrument equipped with an action mechanism whereby a hammer strikes a string by operating the hammer assembly, it does not prevent the hammer from striking the string during normal playing, and the hammer assembly is rotated immediately before the hammer strikes during non-string playing. A support rail to which the support of the action mechanism is attached is composed of a movable support rail and a fixed support rail, and the movable support rail holds the support and the fixed support rail. It is arranged to be movable back and forth with respect to and can be operated Keyboard instrument, characterized in that it is moved further forward than the normal play time of non-string-striking performance by stage. 3. The keyboard musical instrument according to claim 1, wherein the distance between the protrusion provided on the small jack of the jack and the regulating button is larger in non-string striking performance than in normal performance. A keyboard instrument characterized by.