JP3413931B2 - Vertical keyboard instrument - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An upright piano that strikes a string with an action mechanism that operates in conjunction with a key depression operation on a keyboard,
Since keyboard musical instruments such as grand pianos have a high performance volume, they are provided with a weak sound mechanism for selectively reducing the performance volume. In the case of an upright piano, this soft sound mechanism is such that the muffler felt is selectively interposed between the string and the hammer by pedal operation, or the hammer rail that locks the hammer assembly at the initial position is moved to the string side. By shortening the distance between the hammer and the hammer, the striking force of the hammer on the strings is weakened, and the playing sound is weakened. On the other hand, in a grand piano, the pedal is operated to move the entire action mechanism together with the keyboard reed in the direction in which the keyboard is arranged, thereby reducing the number of strings hit by the hammer to reduce the sound.

Recently, as a keyboard instrument equipped with a sound deadening device for completely not generating a string striking sound in addition to the above-described weak sound mechanism, for example, US Pat. No. 2,250,06.
The one described in No. 5 is proposed. This silencer prevents the hammer from striking the strings by preliminarily lifting the hammer assembly during non-striking performance that does not generate string-striking sounds so that the jack does not push up the hammer assembly during key-pressing operations. This is a performance that does not generate (non-striking performance). If such a muffling device is incorporated into a keyboard instrument together with a key sensor used in an automatic playing piano, a natural piano performance can be enjoyed during normal performance without silence (including soft sound performance). At the time of string-striking performance, it is possible to enjoy the performance of an electronic piano in which a key sensor controls a musical tone control circuit to generate an electronic sound.

[0004]

However, in the above-described conventional sound deadening device, since the hammer assembly is lifted up in advance at the time of non-striking performance, the jack does not push up the hammer assembly even if the key is pressed, and therefore, during the normal performance. There was a drawback that you could not get the key touch feeling.

Therefore, as a method for solving such a problem, the present applicant has a means for preventing the rotation of the hammer assembly immediately before the hammer hits the string during the non-strike performance.
The regulation assembly can be moved up and down, and the regulation assembly is moved to the small side of the jack during non-string striking to provide a means to change the time at which the jack escapes from the hammer assembly earlier than during normal performance. A keyboard instrument that enables string performance has already been proposed (Japanese Patent Application No. 5-157934, hereinafter referred to as prior art).

FIG. 5 is a side view of the essential portions of the above-mentioned prior art showing the structure of the blocking means during non-string playing. This blocking means 1 comprises a hammer shank stopper 2 having a high rigidity and a cushioning member 3 such as felt, and a hammer assembly 4
The damper mechanism 5 is arranged so as to be vertically movable in a narrow space, and is held at an upper position which does not prevent rotation of the hammer shank 6 indicated by a chain double-dashed line during normal playing, and when not playing strings. The hammer shank 6 is configured to be moved to a lower position which prevents the hammer shank 6 from rotating immediately before the hammer 7 strikes the string. In addition, 8 is a string.

However, in such a keyboard instrument, it is necessary to move the blocking means 1 up and down a relatively large distance within a narrow space between the hammer shank 6 and the damper mechanism 5 so that the damper mechanism 5 does not come into contact with the blocking mechanism 1. However, there is a problem in that the size is restricted, sufficient rigidity cannot be ensured, and the rotation of the hammer assembly 4 cannot be sufficiently prevented. Further, it is difficult to move the hammer shank stopper 2 having a long frontage in parallel in the vertical direction for a long distance, and its holding and guiding mechanism are not easy.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to reduce the moving distance of the blocking means when switching between the normal playing state and the non-string striking state. Another object of the present invention is to provide a vertical keyboard instrument in which the rigidity of the hammer shank stopper can be increased, and the rotation of the hammer assembly can be reliably prevented during non-string striking performance.

[0009]

To achieve the above object, a first invention is a hammer for striking a string, a jack for pushing up a bat at the time of striking motion and rotating the hammer.
A vertical keyboard instrument that includes a regulating assembly that causes the jack to escape from the bat during a string striking operation, and that has an action mechanism in which the hammer strikes the string by operating in conjunction with a key depression operation on the keyboard. In the above, in the normal performance, the hammer does not block the string striking, and in the non-striking performance, the block means for blocking the rotation of the hammer shank of the action mechanism immediately before the hammer strikes the string, and the block means are arranged on the keyboard. A switching means for switching between a normal performance state and a non-string-striking performance state by moving it in the installation direction, and the blocking means is disposed between the string and the damper mechanism so as to be movable in the keyboard installation direction. The hammer shank stopper is placed in parallel on the surface of the hammer shank stopper facing the hammer shank at the same pitch as the action split. A plurality of cushioning members, the cushioning members are located between the adjacent hammer shanks during normal playing, and enable the hammer to strike a string, and the hammer shank stopper is used for the switching means during a non-stringing play. It is characterized in that it corresponds to the hammer shank of each action mechanism by being moved by approximately half pitch for action splitting, and prevents striking by the hammer. In a second aspect based on the first aspect, the hammer shank stopper of the blocking means is
It is characterized in that it is held so as to be movable in the direction in which the keyboards are juxtaposed by a holding member provided on the action bracket. In a third aspect based on the first or second aspect, the hammer shank stopper of the blocking means is provided with a cushion member that defines a maximum rotation angle of the damper mechanism on a surface corresponding to the damper mechanism. It is characterized by

[0010]

In the vertical keyboard instrument according to the present invention, the buffer member of the blocking means is arranged in parallel with the hammer shank stopper at an action split, that is, at a pitch substantially the same as the arrangement pitch of the action mechanism. When the hammer shank stopper is located between the shanks and does not prevent the hammer from striking the string, and the hammer shank stopper is moved by a half pitch (6 to 7 mm) of the action split (13 mm) during the non-string striking performance, each action mechanism is moved. Corresponds to the hammer shank of and prevents rotation of the hammer shank just before the hammer hits the string. Therefore, the hammer does not strike the strings and enables non-string playing. Since the blocking means moves in the parallel installation direction of the keyboard, that is, in the left-right direction by a half pitch (about 6 to 7 mm) divided by the action, the moving distance is relatively short and the gap with the damper mechanism can be increased. Therefore, the cross-sectional area of the shank stopper can be increased, and the rigidity can be increased. Also, if the rigidity is high, the rotation of the hammer shank can be surely stopped, and there is no fear that the hammer will hit the string even when the key is strongly pressed (fff). State) can be obtained.

[0011]

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 in a normal performance when the present invention is applied to an upright piano, FIG. 2 is an enlarged side sectional view of an essential part in a normal performance, and FIG. It is a partial expanded side sectional view. In these drawings, the upper and lower ends of the string 10 of each pitch are locked to a frame (not shown) via a tuning pin and a frame pin (not shown), and are stretched substantially vertically with a predetermined tension. . A center rail 12 extending in common to all strings 10 is provided in front of the strings 10 at a rear end portion 13a of a keyboard 13.
The center rail 12 is provided with an action mechanism 14 and a damper mechanism 15 that operate in conjunction with the keyboard 13 to strike the corresponding string 10.

The action mechanism 14 includes a wippen flange 16 fixed to a lower end of the center rail 12.
At the lower end (not shown in FIGS. 2 and 3), there is provided a whip pen 18 whose rear end is pivotally supported in a vertical direction via a pin 17 and which is long in the front-rear direction. The whip pen 18 has a free end (front end)
The capstan 1 in which the whipen heel 18A integrally provided on the lower side surface is planted on the upper surface of the rear end portion 13a of the keyboard 13.
It is usually held substantially horizontally by being placed on the table 9. In addition, a jack 20 is provided at the substantially center of the upper surface of the whip pen 18.
Is provided. The jack 20 is formed in an L-shape in a side view, and its lower end bent portion is rotatably supported in the front-rear direction via a pin 22 on a jack flange 21 projecting from the upper surface of the whip pen 18. The jack spring 23 imparts a clockwise habit of rotating clockwise in FIG. 1, and the upper surface 20a of the one arm 20A extending upward abuts the lower surface front end portion of the bat 25 constituting the hammer assembly 24 and the other arm extending forward. 20B forms Jack Small.

The hammer assembly 24 is a butt flange 2 fixed to the shoulder portion of the center rail 12.
6 (not shown in FIGS. 2 and 3), the bat 25 rotatably arranged in the front-rear direction via a center pin 27, and a hammer arranged on the upper surface of the bat 25 via a hammer shank 29. Wood 28A and hammer head 2
8B and a catcher 3 disposed on the front surface of the bat 25 via a catcher shank 30.
1 and a butt spring 32 that gives the bat 25 a turning habit in the returning direction (counterclockwise direction in FIG. 1), and the hammer shank 29 normally comes into contact with the hammer rail 33 through the felt 34 to bring the butt 25 to the initial position. It is locked.

When the keyboard 13 is pressed, the whip pen 18 is pushed up by the capstan 19 and the pin 17
When it is rotated clockwise about the
Pushes up the bat 25 and rotates the hammer assembly 24 in the clockwise direction, whereby the hammer 28 strikes the string 10 corresponding to the keyboard 13 on which the key has been pressed.
During the striking operation, the jack 20 rotates counterclockwise against the jack spring 23 by the jack small 20B abutting against the below-mentioned regulating assembly 35 to prevent its ascending movement during its ascent. The upper end of the jack 20 is moved to the bat 2.
Temporarily escape from the bottom of 5. This escape time is set when the hammer 28 approaches the string 10 by about 2 to 3 mm during normal playing. And jack 20
After the string striking operation by the hammer 28, the upper end of the pen moves into the lower part of the bat 25 again as the whip pen 18 rotates and returns in association with the returning movement of the keyboard 13, so that the next string striking operation is performed. to enable.

A back check wire 36 and a bridle wire 37 are further provided on the upper surface of the whip pen 18 on the free end side.
Is planted on the front side of the keyboard 13 at a required angle. At the upper end of the back check wire 36, the repulsive force of the string 10 and the butt spring 32 after the string striking operation.
There is provided a back check 39 which elastically receives the catcher 31 of the hammer assembly 24 which is rotated and returned by the force of. The catcher 31 and the bridle wire 37 are connected to each other by a bridle tape 40, whereby the hammer assembly 2
The rotation return of No. 4 is followed by the rotation return of the whip pen 18 to prevent the hammer assembly 24 from bouncing back and hitting the string 10 twice, and to accelerate the return of the hammer assembly 24 to the initial position.

The damper mechanism 15 includes a damper lever flange 43 (not shown in FIGS. 2 and 3) having an intermediate portion disposed on the upper surface of the center rail 12 and a shaft which is rotatable in the front-rear direction via a pin 44. A damper lever 46 supported by the damper lever spring 45 and imparted with clockwise habit of turning, and a damper 48 disposed on the upper end of the damper lever 46 via a damper wire 47.
Etc. The damper 48 normally presses the string 10 by the spring force of the damper lever spring 45 to prevent the string 10 from freely vibrating. When the keyboard 13 is pressed, the damper 48 is planted on the upper surface of the base end portion of the whip pen 18. The damper spoon 49 is configured to separate from the string 10 by pressing and rotating the lower end portion of the damper lever 46 against the damper lever spring 45. After the damper 48 is separated, the hammer 28 strikes the string 10 to enable normal performance. The action mechanism 14 and the damper mechanism 15 described above are exactly the same as the action mechanism and the damper mechanism of the conventional upright piano as shown in FIG.

In the present invention, a device for enabling non-string-striking performance that does not generate a string-striking sound without impairing the key touch feeling during the above-described normal performance, that is, the muffling device 50.
Is equipped with. The muffling device 50 includes a shaft 51 that holds the regulating assembly 35 that allows the jack 20 to temporarily escape from the lower portion of the bat 25 during string striking operation so as to be vertically movable, and the hammer assembly 24 that does not perform string striking. And a blocking means 52 for blocking the rotation immediately before striking the string.

The regulating assembly 35 includes:
The 88-key action mechanism 14 is grouped into a plurality of action mechanisms 14, and a regulating rail 53 extending transversely for each section, and the regulation mechanism corresponding to the jack small 20B of the jack 20 of each action mechanism 14 are provided. A plurality of regulating buttons 55 arranged on the rail 53 via regulating screws 54.
And a plurality of regulating brackets 56 that hold the regulating rails 53, and the base end of the regulating bracket 56 is fixed to a lever 57 that is integrally provided on the shaft 51. The ching button 55 is located above the small jack 20B with a predetermined distance. Regulatoring bracket 56
Is made of metal and has high rigidity. Jack small 20B
The distance D between the regulating button 55 and the regulating button 55 is 2 to 2 on the string 10 when the hammer 28 is in the normal performance shown in FIGS.
The distance is set so that the jack 20 escapes from the lower part of the bat 25 when approaching up to about 3 mm, that is, about 3 to 5 mm.
When approaching up to about 15 mm, the small jack 20B is changed to a distance D '(FIG. 3) that escapes from the lower part of the bat 25. This distance D'is about 1 to 3 mm, which is smaller than the distance D during normal playing. The regulating screw 54
When is rotated, the regulating button 55 moves up and down together with the regulating screw 54, so that the distance D can be finely adjusted. When the distance D is increased, the escape timing of the jack 20 is delayed, On the contrary, the smaller the size, the faster.

The distance D between the small jack 20B and the regulating button 55 differs for each key and is adjusted strictly, but in the present invention, the regulating rail 5 is used.
Since the position of 3 is changed by the rotation of the shaft 51, the distance D changes by the same amount for all keys. Therefore, the difference between the keys of the distance D does not change between sounding and mute. For example, if the regulating rail 53 is displaced by 2 mm, the distance D of the A key changes from 5 mm to 3 mm and the B key changes from 4.5 mm to 2.5 mm at the time of sound generation and at the time of mute. Therefore, the difference between the A key and the B key is 0.5 mm in both sound generation and mute.

The axis 51 is used for all the action mechanisms 14
The spring receiving fitting 58 is L-shaped in a side view and is provided at the lower portion of the front surface of the center rail 12 and the spring receiving member provided on the front surface of the spring receiving fitting 58 by a set screw 59. It is rotatably held together with the metal fitting 58 and a bearing member 60 which is fastened and fixed to the center rail 12 together. The lever 57 has a high rigidity, and an intermediate portion thereof is fixed to the shaft 51 by welding, a set screw, or the like, and a shaft between the lower end portion and a lower portion of the front surface of the spring receiving member 58 is interposed by the lever 57. There is a spring 61 interposed between the spring 61 and the spring 61. For this reason, the upper end of the lever 57 is usually the center rail 1
2 is pressed against the lower part of the front surface of the protruding portion 12A provided on the upper part of the front surface of the jack 2 through the felt 62, and in this state, the distance between the small jack 20B and the regulating button 55 is set and maintained at the distance D during normal playing. is doing. On the other hand, axis 5
When 1 is rotated counterclockwise against the spring 61 to switch from the normal performance state to the non-string-playing performance state, the regulating assembly 35 rotates downward as the lever 57 rotates, as described above. Since the ching button 55 is brought closer to the small jack 20B, the distance D becomes smaller, resulting in D'shown in FIG. The rotation of the shaft 51 at this time is restricted by the lower rear portion of the lever 57 contacting the front end surface of the bottom plate portion 58a of the spring receiving fitting 58, as shown in FIG. 3, whereby a desired distance D ′ is obtained. be able to.

Any means may be used for rotating the shaft 51, for example, a shelf board 70 on which the keyboard 13 is arranged.
An appropriate lever is provided on the lower surface of (Fig. 1) and the shaft 51 is rotated by manually operating the lever, or a pedal is provided on the lower front portion of the instrument body, and the shaft 51 is rotated by depressing the pedal. Alternatively, the shaft 51 may be rotated by a drive motor. 2 and 3, 72, 73 and 74 are felts.

In FIGS. 1 and 4, the blocking means 52 for blocking the rotation of the hammer 28 during the non-string striking performance.
Is a plate-like hammer shank stopper extending between the hammer assembly 24 and the string 10, strictly speaking, the damper mechanism 15 so as to be movable in the juxtaposing direction of the strings 10 corresponding to all the action mechanisms 14. Eighty-one. The hammer shank stopper 81 is arranged at a position where the hammer shank 29 does not come into contact with it during normal playing, and a plurality of cushioning members 83 made of felt or the like are provided on the front surface of the hammer shank 29 through an alignment member 82 for action splitting. That is, the arrangement pitch P of the action mechanism 14 (about 13 m
m) are arranged in parallel at substantially the same pitch, and a cushion member 84 is fixed to the rear surface corresponding to all the damper mechanisms 15. The thickness of the cushioning member 83 is set to a thickness with which the hammer shank 29 abuts when the hammer 28 approaches the string 10 by about 8 to 15 mm during non-strike performance, and the width w is approximately half of the action split P. Width (6-7
The clearance x between the adjacent cushioning member 83 is set to be larger than the outer diameter (5 to 6 mm) of the hammer shank 29. The hammer shank stopper 81 is movably held in the left-right direction by a plurality of holding members 86 provided at the two ends and the middle of the hammer shank stopper 81. The holding members 86 at both ends are formed in an upward U-shape as shown in FIG. 4 by bending a metal plate or the like, so that the hammer shank stopper 81 is formed.
Has a holding groove 87 into which the end portion of is slidably inserted, and is firmly fixed to the left and right action brackets 90 standing on the shelf board 70 (FIG. 1) by a plurality of setscrews 91. There is. Further, stopper pieces 88a and 88b for limiting the movement of the hammer shank stopper 81 are integrally provided on the outer surfaces of the holding members 86 at both ends, and the distance between these stopper pieces is the length of the hammer shank stopper 81. Therefore, the length is set to be approximately half the length of the action split P described above.

The holding members 86 for holding the intermediate portion of the hammer shank stopper 81 are not shown in the drawings, but these holding members are U-shaped or L-shaped upward in side view.
It is shaped like a letter and does not have the above-mentioned stopper piece, and is fixed to the action bracket at a position that does not correspond to the action mechanism 14, that is, at the boundary between the low, middle, and high range. In addition, the action bracket 90 includes the center rail 1 described above.
2 is fixed.

In FIG. 4, 100 is the blocking means 61.
By a predetermined distance in the left-right direction to switch between the normal performance state and the non-string-striking performance state.
Is a wire 101 whose one end is connected and fixed to the left end face of the hammer shank stopper 81, that is, the bass end face.
A plurality of rollers (holding only one in FIG. 4) for holding the intermediate portion of the wire 101, a tension coil spring 103 interposed in the middle of the wire 101,
A pedal 104 arranged at the lower part of the piano body and connected to the other end of the wire 101, and a tension coil spring 105 having one end connected to the right end surface of the hammer shank stopper 81 and the other end locked to the piano body side. Etc. The tension coil spring 105 on the right side has a larger spring force than the tension coil spring 103 on the left side, whereby the hammer shank stopper 81 is moved to the right side and held at the right end during normal playing, that is, when the pedal 104 is not depressed. It is pressed against the stopper piece 88a of the member 86. In this state, each cushioning member 83 is located between the hammer shanks 29 of each action mechanism 4.
Therefore, the blocking means 81 does not prevent the hammer 28 from striking the string during normal playing.

Next, the operation of the above-described structure during non-string striking performance will be described. Axis 5 from the normal playing state shown in FIG.
1 is rotated counterclockwise by a predetermined angle to lower the regulating assembly 35 by a predetermined distance, and the distance between the small jack 20B and the regulating button 55 is changed from D (FIG. 2) to D '.
Change to (Fig. 3). Also, the pedal 1 of the switching means 100
When the hammer shank stopper 81 is stepped on and the hammer shank stopper 81 is moved a predetermined distance to the left in FIG. 4 against the tension coil spring 105, the left end face of the hammer shank stopper 81 contacts the stopper piece 88b of the left end holding member 86. Stop. This movement amount is equal to approximately half the pitch of the action split P as described above, and therefore each cushioning member 83 corresponds to the hammer shank 29 of each action mechanism 14,
As a result, the normal playing state is switched to the non-string playing state.
It should be noted that the pedal 104 is rotated leftward (or rightward) while maintaining this state after the depression operation, and a step surface formed at one side edge of a pedal hole provided in the lower front surface of the piano body. It is held in a non-string-playing position by being abutted and locked on.

In the non-string-playing state, the keyboard 13 is depressed, and the action mechanism 14 operates in conjunction with this.
As jack 20 raises hammer assembly 24 upwards, hammer 28 attempts to strike string 10. Then, the jack 20 comes into contact with the regulating button 55 during the string striking operation and is prevented from rising, so that the jack 20 rotates clockwise and escapes from the lower portion of the bat 25. On the other hand, the hammer assembly 24 tries to continue to rotate upward even after the jack 20 escapes, but the hammer 28 causes the string 28 to move.
Before hitting 0, the hammer shank 29 comes into contact with the corresponding cushioning member 83 and is prevented from further rotating,
Hammer 28 bounces without striking string 10,
Rotate back to the initial position. Further, the jack 20 also descends in conjunction with the whip pen 18, the upper end surface thereof re-enters the lower portion of the bat 25, and returns to the initial position. As a result, it is possible to perform a non-string-striking performance in which no string-striking sound is emitted. Further, although the damper mechanism 15 also rotates in response to a key depression operation on the keyboard 13, the maximum rotation angle of the damper mechanism 15 is a cushion member 84 provided on the rear surface of the hammer shank stopper 81.
Is defined by contacting the damper wire 47 of the damper mechanism 15.

Thus, in the vertical keyboard instrument having such a structure, the blocking means 80 is moved in the left-right direction by a half pitch of the action split P in the non-striking performance so that the buffer member 83 corresponds to the hammer shank 29. Therefore, unlike the prior art shown in FIG. 5, the height of the blocking means 80 is the same during the normal performance and the non-striking performance, and the movement amount of the blocking means 52 is small.
The gap between and can be set large. Therefore, the thickness of the hammer shank stopper 81 can be increased (about 8 mm), and the rigidity can be increased. Further, if the rigidity is increased, the hammer shank 29 can be surely stopped from rotating without being bent, and the hammer 28 is not likely to hit the string even when the key is strongly pressed (fff), so that a wide range is achieved. With the touch of, the mute state (non-striking performance state) can be obtained. Also, the blocking means 80
Since it is moved in the left-right direction, the guide holding structure of the hammer shank stopper 81 is simpler than in the case where it is moved up and down, and the hammer shank stopper 81 can be moved reliably without prying. Further, since the hammer shank stopper 81 is arranged on the action bracket 90 having high rigidity via the holding member 85, the stopper 81 can be stably attached. Furthermore, the hammer shank stopper 81 is provided with a cushion member 84 on the rear surface, and the cushion member 84 defines the maximum rotation angle of the damper mechanism 15, whereby the action bracket 90.
It is possible to omit the conventional damper rail and the damper rail felt which are laterally laid between them.

Further, a key sensor is provided on the keyboard 13 so that the keyboard 13 can be operated by the key sensor during non-striking performance.
When the operation of is detected and the tone control circuit is controlled by this detection signal to generate an electronic sound from an electronic sound source, it can be used as an electronic piano without impairing the touch feeling of the piano. If you listen to the sound with headphones or let the speaker produce a low volume,
No noise pollution to neighboring residents during the day or at night.

In the above embodiment, the blocking means 52 is moved by the depression operation of the pedal 104 to switch between the normal playing state and the non-string playing state. However, the present invention is not limited to this. Instead, various changes and modifications are possible, such as pulling with the operating lever, or automatically moving with a drive motor, solenoid, etc., or moving in conjunction with the shaft 51 that moves the regulating assembly 35 up and down. Is.

[0030]

As described above, in the vertical keyboard instrument according to the present invention, the cushioning member is arranged in parallel with the blocking means at substantially the same pitch as the action split, and the blocking means is arranged in parallel with the keyboard during non-string playing. Since the cushioning member is configured to be moved by approximately half the pitch for action splitting so as to correspond to each hammer shank, the movement amount of the blocking means is small and the gap with the damper mechanism can be set large. Therefore, the rigidity of the hammer shank stopper can be increased. Moreover, if the rigidity is increased, the hammer shank can be reliably stopped from rotating without being bent, and the hammer does not have to hit the string even when the key is strongly pressed (fff), and a wide range of touch can be achieved. In, it is possible to obtain a mute state (non-striking performance state). Further, since the blocking means is moved in the left-right direction, the guide holding structure of the hammer shank stopper is simpler than in the case of moving it up and down, and the hammer shank stopper can be reliably moved without being twisted. Further, since the hammer shank stopper is arranged on the action bracket having high rigidity, the stopper can be stably attached. Furthermore, the hammer shank stopper also serves as a conventional damper rail by including a cushion member.

[Brief description of drawings]

FIG. 1 is a side sectional view of an action mechanism section during normal performance when the present invention is applied to an upright piano.

FIG. 2 is an enlarged side sectional view of an essential part during normal performance.

FIG. 3 is an enlarged side cross-sectional view of a main part at the time of non-striking performance.

FIG. 4 is a partially omitted perspective view of the blocking means during normal performance.

FIG. 5 is a side view of an essential part for explaining a defect of a conventional keyboard instrument.

[Explanation of symbols] 10 strings 12 Center rail 13 keys 14 Action mechanism 15 Damper mechanism 20 Jack 20B Jack small 24 Hammer assembly 25 bats 28 hammer 29 hammer shank 35 Regulatoring assembly 47 damper wire 50 silencer 52 Blocking Means 81 Hammer shank stopper 83 Buffer member 84 Cushion member 86 holding member 90 action bracket

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G10C 3/16 G10C 1/02

Claims (3)

(57) [Claims] 1. A keyboard comprising a hammer for striking a string, a jack for pushing up a bat during a string striking operation to rotate the hammer, a regulating assembly for escaping the jack from the bat during a string striking operation, and the like. In a vertical keyboard instrument that has an action mechanism in which the hammer strikes a string by operating in conjunction with a key depression operation, in a normal performance, the hammer does not prevent the string from being struck by the hammer, and in the non-string performance, the hammer is Blocking means for blocking the rotation of the hammer shank of the action mechanism immediately before striking the string,
The blocking means is arranged in a direction in which the keyboards are arranged in parallel, and a switching means for switching between a normal playing state and a non-string striking state is provided. The blocking means is arranged between the strings and the damper mechanism. The hammer shank stopper movably arranged in a predetermined direction, and a plurality of buffer members arranged in parallel on the surface of the hammer shank stopper facing the hammer shank at substantially the same pitch as the action split. The member is located between the adjacent hammer shanks during normal playing and enables the strings to be struck by the hammer, and the hammer shank stopper is moved by the switching means by an approximately half pitch for action splitting when the string is not struck. The vertical type is characterized by corresponding to the hammer shank of each action mechanism and preventing the hammer from striking the strings. Board instruments. 2. The vertical keyboard instrument according to claim 1, wherein the hammer shank stopper of the blocking means is held by a holding member provided on the action bracket so as to be movable in the keyboard juxtaposition direction. Vertical keyboard instrument. 3. The vertical keyboard instrument according to claim 1, wherein the hammer shank stopper of the blocking means is provided with a cushion member that defines a maximum rotation angle of the damper mechanism on a surface corresponding to the damper mechanism. A vertical keyboard instrument that is characterized by