JPH0627934A - Keyboard musical instrument - Google Patents

Abstract

PURPOSE:To obtain the keyboard musical instrument on which a string nonstroke performance generating no string stroke sound and a normal performance can be switched without obstructing a touch on a key by changing the period wherein a regulating button changes the direction of the motion of a jack. CONSTITUTION:This keyboard musical instrument is equipped with a tensed string 11, a hammer head 13 which rotates to hit the string 11, the jack 33 which moves a bat 15 forth and back, a 1st center rail 28 which supports the hammer assembly rotatably, the regulating button 35 which abuts on the jack 33 to temporarily limit its motion to change the direction, a hammer stopper 120 which stops the string striking by the hammer head 13, and a 2nd center rail 102 which is rotatable to the 1st center rail 28 and holds the regulating button 35 when the string hitting is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard instrument, and by providing a second center rail or a flexible regulating bracket, it is possible to change the time when the regulating button changes the movement direction of the jack. It is possible to switch between a non-string-striking performance that does not generate a string-striking sound without hindering the touch of and a normal performance.

[0002]

2. Description of the Related Art Heretofore, as a keyboard instrument in which pronunciation by striking a string has been changed, one disclosed in Japanese Utility Model Laid-Open No. 51-67732 has been proposed. This keyboard instrument has a stopper having an elastic body on the surface facing the hammer shank between the string and the hammer shank of the hammer assembly, and the rotating hammer shank is received by the stopper via the elastic body. Is. The elastic body absorbs the kinetic energy generated by the rotation of the hammer to weaken the kinetic energy and effectively reduce the sound volume caused by striking the strings without impairing the sound quality or the sound of the strings. .

[0003]

However, in such a keyboard instrument, there is a problem in that the touch of the key must be sacrificed to some extent when the pronunciation by the string striking is not completely generated. It was That is, in order to prevent the string striking sound from being generated, it is necessary to bring the stopper closer to the hammer shank side. At this time, the normal approach (the distance between the striking surface of the hammer and the string when the hammer does not receive the thrusting force from the jack and starts the free rotation motion) remains about 2 mm.
At this approaching value, before the bat of the hammer assembly is separated from the jack, the hammer shank is caught and stopped by the jack and the stopper, which makes it difficult to perform repeated hits and the like, which makes it impossible to perform a performance like a conventional piano. In order to prevent this, the approach must be wider than usual, for example, about 5 to 7 mm. In other words, the time when the bat leaves the jack is adjusted early. In this way, the touch of the key changes, the stopper is moved to a position where it does not contact the hammer shank, and during the normal performance in which a sound is generated by striking a string, the energy supplied by the jack is reduced due to an early escape. However, since the impact force of the hammer is weakened, the tone produced by striking the strings becomes a little softer. In addition, the repeated hitting property of the keyboard was somewhat deteriorated.

Therefore, an object of the present invention is to provide a second center rail or a flexible regulating bracket so that the timing at which the regulating button changes the movement direction of the jack can be changed and the key touch. It is an object of the present invention to provide a keyboard musical instrument that can switch between non-string-striking performance that does not generate string-striking sound and normal performance without hindering.

[0005]

According to a first aspect of the present invention, there is provided a tensioned string, a hammer assembly that pivots to strike the string, and a hammer assembly that pushes up the hammer assembly.
A jack for escaping the hammer assembly, a first center rail for rotatably supporting the hammer assembly, and a regulating button for changing the movement direction of the jack by abutting on a part of the jack. In the keyboard instrument, a blocking means for blocking the striking of the hammer assembly, and a second center rail which is movable with respect to the first center rail and holds the regulating button when the striking is blocked by the blocking means. And a keyboard instrument.

Further, the invention according to claim 2 is a tensioned string, a hammer assembly that rotates to strike the string, and a jack that pushes up the hammer assembly and causes the hammer assembly to escape. A center rail that rotatably supports the hammer assembly, a regulation bracket that is held by the center rail and has flexibility, and a regulation bracket that is connected to the regulation bracket and abuts a part of the jack. A keyboard instrument comprising a regulating button for changing the movement direction of a jack and a blocking means for blocking the hammering of the hammer assembly, wherein when the stringing is blocked by the blocking means,
A keyboard instrument including a flexible means for bending the regulating bracket.

[0007]

In the keyboard instrument according to the first aspect of the present invention, when the hammer assembly is in the non-striking state, the second instrument is used.
The center rail moves, and the regulating button is lowered. The time when the movement direction of the jack is changed by the regulating button is accelerated. Then, the hammer assembly escapes from the jack earlier. For this reason,
It is possible to switch between a non-string-striking performance that does not generate a string-striking sound and a normal performance without disturbing the touch of the key.

Further, in the keyboard instrument according to the second aspect of the present invention, when the hammer assembly is in the non-striking state, the regulating bracket bends and the regulating button is lowered. The time when the movement direction of the jack is changed by the regulating button is accelerated. Then, the hammer assembly escapes from the jack earlier. Therefore, it is possible to switch between the non-string-striking performance in which no string-striking sound is generated and the normal performance without disturbing the touch of the key.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a keyboard instrument according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a rest state of strings and actions of an upright piano according to a first embodiment of a keyboard instrument of the present invention.

In this figure, the string 1 is associated with each pitch.
1 is stretched almost vertically. In the figure, one of them is taken out and shown. A hammer assembly is arranged corresponding to the string 11. This hammer assembly is fixed to the hammer head 13 that pivots clockwise in the drawing to strike the string 11, the hammer shank 14 that is connected to the hammer head 13, and the proximal end of the hammer shank 14. Bat 15 and this Bat 1
The butt spring 16 is attached to the right end of the butt 5, the catcher shank 18 is connected to the left end of the bat 15 so as to project therefrom, and the catcher 19 fixed to the tip of the catcher shank 18 is provided.

Then, the butt 15 of the hammer assembly
The center pin 17 swingably supports. The butt spring 16 constantly urges the bat 15 in the counterclockwise direction in the drawing. Reference numeral 28 is a first center rail that is commonly extended across all 88 keys arranged corresponding to the strings 11. The butt 15 is rotatably attached to the upper end of the first center rail 28 via a butt flange 29 with the center pin 17 serving as a fulcrum. On the other hand, the first center rail 28
A whip pen 26 is rotatably attached to the lower end of the. The whip pen 26 is provided so as to horizontally project from the first center rail 28.

On the upper surface of the whip pen 26, on the right side of the first center rail 28, an L-shaped jack 33 is erected so as to be swingable via a jack flange 32. The tip (top end) of the large jack 33A of the jack 33 is in contact with the lower end surface of the bat 15. The jack 33 transmits the turning force in the clockwise direction in the drawing corresponding to the keystroke to the bat 15. A bat skin 15A is attached to the contact surface of the bat 15. On the left side of the jack flange 32, the jack spring 34 is provided on the lower surface of the small jack 33B and the upper surface of the whip pen 26.
Both ends of are locked. The jack spring 34 biases the jack 33 around the pin 36 in the clockwise direction in the figure.

Reference numeral 35 is a regulating button, which is arranged at a position where the upper surface of the small jack 33B can contact. More specifically, the regulating button 35 is retained by being screwed into the lower portion of the regulating rail 100 that extends across the 88 keys arranged corresponding to the strings 11. The regulating rail 100 is a non-flexible regulating bracket 101.
Is fixed to one end of the with a screw 99. The regulating screw 98 is rotated by using an adjusting tool (not shown) to finely adjust the distance that the regulating button 35 projects from the regulating rail 100 independently for each key. On the contact surface of the regulation button 35, a regulation button punching 35A made of leather or the like is formed.
Is attached.

The regulating bracket 101
The other end of is screwed into the second center rail 102. The second center rail 102 is also transversely extended in common over all 88 keys arranged corresponding to the strings 11, and on the left surface (the surface facing the jack 33) of the first center rail 28, It is bolted with a hexagon bolt 103 via a leaf spring 104. In detail,
Second center rail 102 and first center rail 2
A round hole 102A and a long hole 28A are formed at predetermined positions on the plate 8. In addition, the second center rail 102
And a contact surface between the first center rail 28 and the first center rail 28 (the right surface of the second center rail 102) are provided with a lubricating sheet 105 such as fluororesin
Is attached. Then, the second center rail 102 to which the lubricating sheet 105 is attached is brought into contact with the first center rail 28. A hexagonal bolt 103 is inserted from the left side of the second center rail 102 into the round hole 102A and the long hole 28A at the predetermined position via a leaf spring 104. In FIG. 1, from the right side of the first center rail 28, the nut 107 is attached via the spring washer 106 to the hexagon bolt 10.
It is screwed into the screw part of 3. Spring washer 10
A lubricating sheet 105 is attached to the left side of 6. As a result, the second center rail 102 is fixed to the first center rail 28 (see FIGS. 2, 3, and 4).

However, the regulating bracket 101
In the known regulating bracket, the mounting portion with the regulating rail is bent at a predetermined angle. The elongated hole 28A is long in the vertical direction. The leaf spring 104 constantly presses and fixes the second center rail 102 to the first center rail 28.

Numeral 110 is a switching means composed of an actuator such as a solenoid, and this switching means 1
A switch 10 moves the second center rail 102 in the vertical direction (arrow in the figure) by switching the second center rail 102 when the string is not striking (lower in the drawing) or when striking (upper in the drawing). That is, when the string is struck by the switching means 110, the upper surface of the second center rail is the first center rail 2.
The lower surface of the protruding portion 8 is abutted via the lubricating sheet 105. Therefore, the regulating rail 10
0, the regulating button 35 is in the normal playing position. On the other hand, when the switching means 110 strikes a string, the second center rail 102 is lowered by about 1 mm from the position where it abuts on the protrusion of the first center rail 28. The regulating rail 100 and the regulating button 35 are located 1 mm below the normal playing position. As a result, the position where the small jack 33B contacts the regulating button 35 is also lowered by about 1 mm (see FIG. 1).

A hammer stopper 120 is arranged between the hammer shank 14 and the string 11. The hammer stopper 120 includes a rotatable shaft 120A extending in the vertical direction on the paper surface, a shank cushion 120B fixed to the shaft 120A, a damper wire cushion 120C, and the like. One end of the shaft 120A is fixed to a rotating shaft of a motor (not shown). At the position where the shank cushion 120B of the hammer stopper 120 faces the hammer shank 14, the shaft 120A
It is assumed that the rotation of is stopped. In this case, when the hammer shank 14 is rotated in the direction of the string 11 by keystroke, the hammer shank 14 contacts the shank cushion 120B of the hammer stopper 120, and the hammer shank 14 is stopped immediately before the hammer head 13 strikes the string. To do. Therefore, the hammer head 13 is prevented from striking the strings. A motor drive circuit is connected to the motor that rotates the shaft 120A of the hammer stopper 120. This motor drive circuit has a built-in switch. This changeover switch is changed over by the changeover means 110. Then, the motor drive circuit applies an output signal corresponding to this switching to the motor to rotate the hammer stopper 120 to a predetermined position.

The operation of the upright piano having the above configuration will be described below separately for switching of the switching means 110.

When the switching means 110 is switched to the non-striking state, the second center rail 102 is lowered, and the regulating rail 100 and the regulating button 35 are also lowered by about 1 mm. In cooperation with the regulating button 35, the shank cushion 1 of the hammer stopper 120
20B stops at a position facing the hammer shank 14 (broken line in FIG. 1).

When a key is pressed, the jack 33 is pushed up in response to this key press. At this time, the damper 43
Separate from the string 11. To raise the jack 33, push the bat 15 upward and rotate the center pin 1 clockwise in the figure.
The bat 15 is rotated about 7. Therefore, the hammer head 13 and the hammer shank 14 provided on the bat 15 rotate clockwise in the drawing. However, when the jack 33 is raised to a position about 1 mm lower than in the normal performance, the small jack 33B contacts the regulating button 35. As a result, the ascent of the jack 33 is prevented earlier than in the normal performance, and the jack 33 releases the bat 15. The approach value at this time is about 5 to 7 mm. Hammerhead 1 after this
3 and the hammer shank 14 continue to rotate in the clockwise direction in the figure due to their inertia, and try to strike the string 11.

However, immediately before the hammer head 13 strikes the string 11, the hammer shank 14 contacts the shank cushion 120B of the hammer stopper 120.
After this contact, the hammer head 13 is repelled by the urging force of the butt spring 16 without hitting the string 11. As a result, the bat 15 rotates about the center pin 17 in the counterclockwise direction in the drawing. Then, the catcher skin 19A contacts the back check 27. That is, when the switching means 110 is switched to the non-striking state, the hammer head 13 does not strike the string and moves to the hammer stop state. Therefore, at this time,
Never pronounce from string 11.

In this state, in response to a keystroke, an electronic sound source may generate sound based on performance information from a key sensor, a hammer sensor or the like used in an automatic piano or the like. You may listen to this pronunciation with headphones or reduce the volume of the speaker. Alternatively, a soundboard driver may be used to sound the soundboard at a low volume. That is, even at night or during the day, if you do not want to make the sound of the upright piano, you can enjoy the performance of the upright piano without sounding from the strings.

On the other hand, when the switching means 110 is switched to the string striking state, the second center rail 102 is raised and the first center rail 102 is raised.
The center rail 28 is brought into contact with the protrusion of the center rail 28 via the lubricating sheet 105, and the regulating lever 100 and the regulating button 35 are moved to the normal playing position. In conjunction with this, the shaft 1 of the hammer stopper 120
20A stops at a position parallel to the string 11 (solid line in FIG. 1).

Then, the jack 33 is pushed up in response to the keystroke, and the damper 43 is separated from the string 11. The jack 33 rotates the bat 15, and the bat 15 escapes from the jack 33 at the normal performance position, and the approach value is about 2 mm, which is the same as the normal performance. After that, the hammer head 13 and the hammer shank 14 are
It continues to rotate in the clockwise direction in the figure and tries to strike the string 11. The hammer head 13 has a hammer stopper 12
Since the turning movement is not interrupted by 0, the string 11 is hit as usual. Even after this string striking, the hammer head 13 repels the string 11 and the bat spring 1 as usual.
It is repelled by the urging force of 6. As a result, the bat 15
Rotates about the center pin 17 in the counterclockwise direction in the figure. Then, the catcher skin 19A contacts the back check felt 27A. That is, when the switching means 110 is switched to the string striking state, the hammer head 13 strikes the string as a normal performance and moves to the hammer stop state.

Therefore, in this upright piano, by providing the vertically movable second center rail 102, it is possible to change the timing at which the regulating button 35 changes the direction of movement of the jack 33, thereby hindering the touch of the key. It is possible to switch between the non-striking performance that does not generate the striking sound and the normal performance.

Next, a second embodiment of the present invention will be described with reference to FIG. This figure shows a mechanism for changing the timing when the regulating button 35 changes the direction of movement of the jack 33. This embodiment uses the second center rail 200 in which the mounting portion of the regulating bracket 101 is larger than the second center rail 102. In the second center rail 200, a screw hole 200A is formed in a portion facing the first center rail 28. From the side opposite to the position of the jack 33 (right side in the drawing), attach the hexagon bolt 201 to the compression spring 202,
The second center rail 200 through the washer 203
The second center rail 200 is held by the first center rail 28 by being screwed into the screw hole 200A. Other configurations are the same as those in the first embodiment.

As in the first embodiment, the regulating button 28 is moved up and down by moving the second center rail 200 up and down. In this embodiment, compared to the first embodiment, the number of parts is reduced and the mounting portion of the regulating bracket 101 is large, so the stability of the regulating bracket 101 is improved. Other functions are the same as those in the first embodiment.

The compression spring 202 and the washer 203
Instead of this, a leaf spring 210 as shown in FIGS. 6 and 7 may be provided between the hexagon bolt 211 and the lubricating sheet 105. In the center rail 28 of FIG. 6, the second center rail 200 is separated by the distance (distance A in the figure) between the mounting portion 28B for the wippen flange 30 (see FIG. 1) and the lubricating sheet 105 and the leaf spring 210. You may comprise so that the raising / lowering distance of may be prescribed.

Next, a third embodiment of the present invention will be described with reference to FIGS. These figures also show the mechanism for changing the timing when the regulating button 35 changes the direction of movement of the jack 33. FIG. 8 shows a string striking state, and FIG. 9 shows a non-string striking state. In this embodiment, the first center rail 28 and the second center rail 301 are used.
The connection with and is made by hinges 300 provided at the bottoms of both sides. The second center rail 301 rotates around this hinge 300 as a fulcrum. In the second center rail 300, the lubricating sheet 105 is attached to the surface facing the first center rail 28. Second center rail 30
By rotating 1 the regulating button 28
Is going up and down. The distance A in FIG. 8 is the same as the distance between the regulating button and the small jack at the time of normal performance. The distance B in FIG. 9 is the regulating button 35 and the small jack 33 when the hinge 300 is opened by a predetermined angle.
It is the distance from A. It is about 1 mm shorter than the distance during normal performance. Instead of the hinge 300, the plastic hinge 302 shown in FIG. 10 may be used.
Other than that, the configuration and operation are the same as those of the second embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 and 12. These figures also show the mechanism for changing the timing when the regulating button 35 changes the direction of movement of the jack 33. FIG. 11 shows a string striking state, and FIG. 12 shows a non-string striking state. In this embodiment, the proximal end of a flexible regulating bracket 402 is directly fixed to the first center rail 28 with a screw 401. Regulatoring bracket 402
A regulating button 35 is held at the tip of the via a regulating rail 100. The regulating bracket 402 is formed of an L-shaped metal plate or the like and has the same strength as a known regulating bracket, but has flexibility of about 1 mm. Due to this flexibility, the regulating button 35 moves up and down within a range of about 1 mm.

The bending of the regulating bracket 402 is performed by the eccentric cam 400 which is in contact with the upper surface of the regulating bracket 402. When the eccentric cam 400 rotates, the distance from the center of rotation 400A to the regulating bracket 402 changes, and the regulating bracket 402 bends. An elliptical cam may be used instead of the eccentric cam 400.
A lubricating sheet 105 is attached to a contact surface of the regulating bracket 402 with the first center rail 28.

The distance A in FIG. 11 is the same as the distance between the regulating button 35 and the small jack 33b during normal playing. The distance B in FIG. 12 is the eccentric cam 4
Regulating button 3 when 00 rotates a predetermined angle
It is the distance between 5 and Jack Small 33B. It is about 1 mm shorter than the distance during normal performance. Other than that, the configuration and operation are the same as in the first embodiment.

[0033]

As described above, according to the present invention, by providing the second center rail or the flexible regulating bracket, the timing at which the regulating button changes the movement direction of the jack can be changed. It is possible to switch between a non-string-striking performance that does not generate a string-striking sound and a normal performance without disturbing the touch of the key.

[Brief description of drawings]

FIG. 1 is a side view showing a rest state of strings and actions of an upright piano according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is an exploded perspective view showing a mounting structure of a first center rail and a second center rail.

FIG. 5 is a view showing a mechanism for changing the timing when the regulating button according to the second embodiment of the present invention changes the movement direction of the jack.

FIG. 6 is a diagram showing a mechanism for changing the timing at which the regulating button according to the modification of the second embodiment of the present invention changes the direction of movement of the jack.

FIG. 7 is an exploded perspective view showing a mounting structure of a first center rail and a second center rail.

FIG. 8 is a view showing a mechanism for changing the timing at which the regulation button in the string striking state changes the direction of movement of the jack according to the third embodiment of the present invention.

FIG. 9 is a view showing a mechanism for changing the timing at which the regulation button in the non-striking state changes the direction of movement of the jack according to the third embodiment of the present invention.

FIG. 10 is a view showing an essential part of a mechanism for changing the timing at which the regulating button according to the modification of the third embodiment of the present invention changes the direction of movement of the jack.

FIG. 11 is a diagram showing a mechanism for changing the timing at which the regulation button in the string striking state changes the direction of movement of the jack according to the fourth embodiment of the present invention.

FIG. 12 is a view showing a mechanism for changing the timing at which the regulation button in the non-striking state changes the direction of movement of the jack according to the fourth embodiment of the present invention.

[Explanation of symbols]

11 strings, 13, 14, 15 hammer assembly, 2
8 1st center rail, 33 jacks, 35 regulating button, 102 2nd center rail, 12
0 Hammer stopper (blocking means), 400 Eccentric cam (flexible means), 402 Regulatoring bracket

Claims (2)

[Claims] 1. A tensioned string, a hammer assembly that pivots to strike the string, a jack that pushes up the hammer assembly to escape the hammer assembly, and rotatably supports the hammer assembly. A first center rail, and a regulating button for changing the movement direction of the jack by abutting on a part of the jack, and a blocking means for blocking the striking of the hammer assembly in the keyboard instrument. A keyboard instrument, comprising: a second center rail that is movable with respect to the first center rail when the string is blocked by the blocking means and that holds the regulating button. 2. A tensioned string, a hammer assembly that pivots to strike the string, a jack that pushes up the hammer assembly to escape the hammer assembly, and rotatably supports the hammer assembly. Center rail, a flexible regulation bracket held by the center rail, and a regulation button that is connected to the regulation bracket and changes the movement direction of the jack by abutting on a part of the jack. And a blocking means for blocking the striking of the hammer assembly, and a flexible means for bending the regulating bracket when the string striking is blocked by the blocking means. Keyboard instrument.