JP3317363B2 - 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 keyboard instrument, in which a hammer stopper is provided outside a turning range of a hammer, and
By providing a flexible regulating bracket, it is possible to change the timing at which the regulating button changes the direction of movement of the jack, without disturbing the touch of the key, and without hitting the string without generating a striking sound. Playing and
Can be switched.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a keyboard instrument in which the sound produced by striking a string is changed as described in Japanese Utility Model Laid-Open Publication No. 51-67732. In this keyboard instrument, a stopper having an elastic body is provided between a string and a hammer shank of a hammer assembly on a surface facing the hammer shank, and the rotating hammer shank is received by the stopper via the elastic body. It is. By absorbing the kinetic energy due to the rotation of the hammer by the elastic body, this kinetic energy is weakened, and the sound volume due to striking is effectively reduced without disturbing the sound quality, the sound of the strings, and the like. .

[0003]

However, in such a keyboard instrument, there is a problem that the touch of the key must be sacrificed to some extent when the sounding of the string is not completely generated. Was. That is, it is necessary to bring the stopper closer to the hammer shank side in order not to generate a stringing sound. At this time, the normal approach (the distance between the struck surface of the hammer and the string when the hammer starts free rotation without receiving the pushing force from the jack) remains at about 2 mm.
With this approach value, the hammer shank is pinched and stopped by the jack and the stopper before the bat of the hammer assembly separates from the jack, so that it is difficult to perform continuous tapping. In order to prevent this, the approach must be wider than usual, for example around 5-7 mm. That is, the time when the bat separates from the jack is adjusted earlier. In this case, the key touch changes, the stopper is moved to a position where it does not abut the hammer shank, and during normal performance that generates sound by striking the string, the energy supplied by the jack decreases due to early escape. Then, since the impact force of the hammer is weakened, the sound produced by striking the strings becomes slightly softer. Further, the continuous tapping performance of the keyboard is somewhat deteriorated.

Accordingly, an object of the present invention is to provide a hammer stopper outside the rotation range of the hammer and a flexible regulating bracket to provide a hammer stopper.
By providing a keyboard instrument that can change the timing at which the regulating button changes the direction of movement of the jack, and can switch between non-stringed performance that does not generate a striking sound and normal performance without disturbing key touch. is there.

[0005]

According to the present invention, there is provided a keyboard musical instrument comprising: a stretched string; a hammer assembly for rotating and striking the string; and a jack for rotating and pushing up the hammer assembly. A center rail for rotatably supporting the hammer assembly, a flexible regulating bracket held by the center rail, and connected to the regulating bracket to abut a part of the jack. A keyboard instrument comprising: a regulating button for changing the direction of movement of the jack; and blocking means provided outside the rotation range of the hammer assembly to prevent striking of the hammer assembly. A flexing means is provided for flexing the above-mentioned regulating bracket at the time of striking.

[0006]

In the keyboard musical instrument according to the present invention, when the string is not struck by the blocking means provided outside the turning range of the hammer assembly, the regulating bracket is bent,
Lower the regulating button. As a result, the timing of changing the direction of movement of the jack by the regulating button is advanced. That is, only when the string is switched to the non-stringed state, the timing at which the hammer assembly escapes from the jack is advanced. On the other hand, in the normal performance, since the regulating button does not descend, the touch of the key is not disturbed in any state. Therefore, do not disturb the key touch,
It is possible to switch between a non-stringed performance that does not generate a stringed sound and a normal performance.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 pause 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, a plurality of strings 11 are extended substantially vertically corresponding to respective pitches. In the figure, one of them is taken out and shown. A hammer assembly is provided corresponding to the string 11. The hammer assembly is rotated clockwise in the figure to rotate the strings 11.
Hammer head 13 for hitting the hammers, a hammer shank 14 connected to the hammer head 13, a bat 15 fixed to the base end of the hammer shank 14, and a bat spring 1 attached to the right end of the bat 15.
6, a catcher shank 18 protrudingly connected to the left end of the bat 15, and a catcher 19 fixed to the tip of the catcher shank 18.

The hammer head 13 is formed by covering a hammer wood 13A with an egg-shaped hammer felt 13B. A hole 13C is formed in a connection portion of the hammer wood 13A with the hammer shank 14.
By fitting the tip of the hammer shank 14 into the hole 13C, the hammer shank 14 is
3 is connected. Further, a pin 120 is projected from the upper surface of the hammer wood 13A at the connection portion by screwing the screw portion 120A. Pin 120
Project in the coaxial direction with the hammer shank 14. That is, the projecting portion 120B of the pin 120 projects from the hammer wood 13A by a predetermined length to the outside of the rotation range (dashed line in the figure) of the hammer felt 13B. The pin 120 rotates together with the hammer head 13.

As shown in FIG. 2, in response to the swing of the hammer for bass (the hammer head is inclined with respect to the hammer shank), the space between the pin 120 and the hammer wood 13A is fixed. , A wedge-shaped spacer 123 is inserted. The wedge-shaped spacer 123 allows the pin 1
As a result of the fixing surface of the hammer shank 20 being held perpendicular to the axis of the hammer shank 14, the pin 120 is screwed to the tip of the hammer shank 14 with the wedge-shaped spacer 123 interposed therebetween and protrudes coaxially therewith.

The pins 120 are formed of a lightweight material such as aluminum, engineering plastic, wood, or bamboo. Therefore, the weight of the hammer assembly is not much different from the conventional one.
The length of the pin 120 may be longer for the low range and shorter for the high range, corresponding to the length of each hammer head 13.
Further, instead of the pin 120, as shown in FIG.
A pin 124 (a in the figure) in which a cover 125 which is a protruding part and a screw part 120A are integrally formed, a pin 120 (b in the figure) in which the cover 125 is screwed to the upper end part 120B of the screw part 120A, and a penetration of the cover 126 The upper end 120B is formed in the hole 126A.
Is pressed into the pin 120 (c in the figure) or the screw portion 1
A circular flange 127 is formed at the boundary between 20A and the upper end 120B.
May be used.

A hammer stopper 121 is provided above the hammer head 13 shown in FIG.
The hammer stopper 121 is composed of a rotatable shaft 121A extending in a direction perpendicular to the plane of the drawing and a cushion 121 made of leather, felt or the like attached to the lower surface of the tip of the shaft 121A.
B. Base end of this shaft 121A (center of rotation)
Is connected to a rotating shaft of a motor constituting the switching means 122. A motor drive circuit is connected to this motor. This motor drive circuit has a built-in switch. The changeover switch is switched by operating a lever or a pedal. The motor drive circuit applies an output signal corresponding to the switching to the motor, and rotates the hammer stopper 121 to a predetermined position.

That is, when switching to the non-string striking state by the switching means 122, the cushion 121B of the hammer stopper 121 rotates to a position facing the pin 120 (broken line in FIG. 1) and stops. In this case, when the hammer head 13 rotates toward the string 11 by tapping, the pin 120 is moved to the cushion 121B of the hammer stopper 121.
And prevents the hammer head 13 from striking the strings. Further, when the string is switched to the string striking state by the switching means 122, the cushion 121B of the hammer stopper 121 is moved.
Rotates outside the rotation range of the pin 120 and stops (solid line in FIG. 1). In this case, even if the hammer head 13 rotates in the direction of the string 11 by tapping, the pin 120 does not come into contact with the cushion 121B of the hammer stopper 121, so that the hammer head 13 hits the string as usual.

The pin 130 shown in FIG.
An elliptical flange 128 is provided at the boundary between the screw portion 130A and the protruding portion 130B. A triangular flange 129 is fixed between the flange 128 and the protrusion 130B. The triangular flange 129 reinforces the pin 130. As shown in FIG. 4B, the pin 130 protrudes from the hammer head 13, but when the pin 130 contacts the hammer stopper 121, the pin 130 is hard to break.

The center pin 17 supports the bat 15 of the hammer assembly shown in FIG. The butt spring 16 always urges the bat 15 in a counterclockwise direction in the figure. Numeral 28 is a center rail extending in common across the 88 keys arranged corresponding to the strings 11. The bat 15 is rotatably mounted on the upper end of the center rail 28 via a butt flange 29 with the center pin 17 as a fulcrum. On the other hand, a wipen 26 is rotatably attached to the lower end of the center rail 28. The pen 26 is provided so as to protrude horizontally from the center rail 28.

On the upper surface of the pen 26, an L-shaped jack 33 is erected on the left side of the center rail 28 via a jack flange 32 so as to be swingable. The tip (top end) of the large jack 33A of this jack 33 is
It is in contact with the lower end surface of the bat 15. Jack 33
Is for transmitting to the bat 15 a turning force in the clockwise direction in the figure according to the keying. A bat skin 15A is attached to the contact surface of the bat 15. On the left side of the jack flange 32, both ends of a jack spring 34 are respectively engaged with the lower surface of the jack small 33 </ b> B and the upper surface of the wipen 26. This jack spring 34
Is for urging the jack 33 around the pin 36 in the clockwise direction in the figure.

Reference numeral 35 denotes a regulating button, which is disposed at a position where the upper surface of the small jack 33B can abut. More specifically, the regulating button 35 is held by being screwed into the lower part of the regulation grail 100 extending transversely across the 88 keys arranged corresponding to the strings 11. The regulation grail 100 is fixed to a flexible regulation bracket 101 with screws 99. The regulating screw 98 is rotated by using an adjustment tool (not shown), and finely adjusts the distance that the regulating button 35 projects from the regulating grail 100 independently for each key. The contact surface of the regulating button 35 is provided with a regulating button punching 35A made of leather or the like.
Is affixed.

Then, the regulating bracket 101
Is fixed to the center rail 28 by a screw 102. The regulating bracket 101 is formed of a metal plate or the like, and has the same strength as a well-known regulating bracket, but has flexibility capable of bending about 1 mm in the vertical direction in FIG. Due to this flexibility, the regulating button 35 moves up and down within a range of about 1 mm.

More specifically, the regulating bracket 1
5, the attachment 101A to the center rail 28 is bent in an L shape as shown in FIGS. 5, 6, and 7, and the attachment 101B to the regulation rail 100 is a screw 9
9 is a shape that is bent in a braille shape so as to surround 9.
The height of the upper surface of the bracket-shaped mounting portion 101B is higher than the height of the regulating screw 98. Conventionally, at a position where the jack stop rail is provided, a bar-shaped cam 106 is rotatably provided near the upper surface of the bracket-shaped mounting portion 101B of the regulating bracket 101. A jack cushion 104 is attached to a part of the cam surface of the rod cam 106. The jack cushion 104 serves as a substitute for the jack stop rail. Regulating bracket 101
, A center rail cushion 105 is also attached to a contact surface with the center rail 28.

From the center of rotation 106A of the rod-shaped cam 106, to the bracket-shaped mounting portion 101B of the regulating bracket 101.
Is changed by the rotation of the rod-shaped cam 106. Due to the rotation of the rod-shaped cam 106, the cam surface of the rod-shaped cam 106 comes into contact with the upper surface of the bracket-shaped mounting portion 101B of the regulating bracket 101, and the regulating bracket 101 bends. That is, when the switching means 122 is switched to the string striking state, the rod-shaped cam 106 rotates to a position where a gap is formed between the rod-shaped cam 106 and the mouth-shaped mounting portion 101B of the regulating bracket 101 as shown in FIG. The regulating bracket 101 abuts on the center rail 28 via the center rail cushion 105 without bending. The position of the regulating button 35 at this time is the same as the position during normal performance. On the other hand, when the switching means 122 is switched to the non-stringed state, the rod-shaped cam 106 rotates to a position where the mouth-shaped mounting portion 101B of the regulating bracket 101 is pushed down as shown in FIG. Regulating bracket 10
1 bends about 1 mm. Regulating bracket 101
Moves away from the center rail 28. At this time, the position of the regulating button 35 is 1 mm more than in the normal performance.
It is about low.

The distance A in FIG. 6 is the same as the distance between the regulating button 35 and the small jack 33B during normal performance. The distance B in FIG. 7 is the distance between the regulating button 35 and the small jack 33B when the rod-shaped cam 106 rotates by a predetermined angle. This distance B is about 1 mm shorter than the distance during normal performance.

The operation of the upright piano according to the above configuration will be described below according to the switching state of the switching means 122.

When the switching means 122 is switched to the non-stringed state, the rod-shaped cam 106 rotates to the position shown in FIG. Due to this rotation, the regulating bracket 101 is depressed by the rod-shaped cam 106, and the regulating bracket 100 and the regulating button 35 are also lowered by about 1 mm. In conjunction with the lowering of the regulating button 35,
The cushion 121B of the hammer stopper 121 holds the pin 12 outside the rotation range of the hammer wood 13A.
It rotates to a position inside the rotation range of the leading end of 0 (broken line in FIG. 1).

When the key is pressed, the jack 33 is pushed up in accordance with the key. At this time, the damper 43
Is separated from the string 11. The jack 33 is raised by pushing up the bat 15 and turning the center pin 1 clockwise in the figure.
The bat 15 is rotated around the center 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 lower by about 1 mm than during normal performance, the small jack 33B comes into contact with the regulating button 35. As a result, the rise of the jack 33 is stopped earlier than during normal performance, and the jack 33 pushes the bat 15 away. The value of the approach at this time is about 5 to 7 mm. After this hammer head 1
Due to its inertia, the hammer shank 3 and the hammer shank 14 continue to rotate clockwise in FIG.

However, immediately before the hammer head 13 hits the string 11, the pin 120 comes into contact with the cushion 121B of the hammer stopper 121. After this contact, the repulsive force of the hammer stopper 121 and the butt spring 1
With the biasing force of 6, the hammer head 13 is rebounded without hitting the string 11. As a result, the bat 15 rotates around the center pin 17 in the counterclockwise direction in the figure. Then, the catcher skin 19A comes into contact with the back check 27. That is, when the switching means 122 is switched to the non-stringing state, the hammer head 13 does not strike the string and moves to the hammer stop state.
Therefore, at this time, the string 11 does not sound.

In this state, the electronic sound source may generate a sound based on performance information of a key sensor, a hammer sensor, or the like used for an automatic piano or the like in response to a keystroke. This sound may be listened to using headphones or the like, or the sound volume of a speaker may be reduced for listening. Alternatively, a sound board driver may be used to generate a small volume sound from the sound board. In other words, even when the user does not want to produce the sound of the upright piano even at night or during the daytime, he can enjoy the performance of the upright piano without sounding the strings.

On the other hand, when the switching means 122 is switched to the string striking state, the bar-shaped cam 106 rotates to the position shown in FIG. Due to this rotation, the rod-shaped cam 106 does not push down the bracket-shaped mounting portion 101B of the regulating bracket 101 downward. Then, the regulating bracket 101
Does not bend and comes into contact with the center rail 28. The regulation grail 100 and the regulation button 35 move to the position of the normal playing state. In conjunction with this, the shaft 121A of the hammer stopper 121 moves outside the rotation range of the pin 120 (solid line in FIG. 1).

Then, the jack 33 is pushed up in response to a 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 position of the normal performance, and the approach value is about 2 mm, which is the same as that of the normal performance. After that, the hammer head 13 and the hammer shank 14, due to their inertia,
The user tries to hit the string 11 by continuing to rotate clockwise in the figure. Since the rotation of the hammer head 13 is not interrupted by the pin 120 and the hammer stopper 121, the hammer head 13 hits the string 11 as usual. Even after the string is struck, the hammer head 13 is rebounded by the repulsive force of the string 11 and the urging force of the bat spring 16 as in a normal performance. As a result, the bat 15 rotates around the center pin 17 in the counterclockwise direction in the figure. And catcher skin 1
9A contacts back check felt 27A. That is, when the switching means 122 is switched to the string striking state, the hammer head 13 strikes the string as usual and moves to the hammer stop state.

Therefore, in this upright piano, the pin 120 and the hammer stopper 121 are provided outside the rotation range of the hammer felt 13B, and
The provision of the flexible regulating bracket 101 allows the regulating button 35 to be connected to the jack 3.
The timing at which the direction of the movement of the third movement is changed can be changed, and the non-stringed performance without generating a hammering sound and the normal performance can be switched without hindering the touch of the key. Also, when the hammer stopper 121 is moved to an intermediate position between the positions indicated by the solid line and the broken line in FIG. Furthermore, even if there is a hammer sensor between the hammer shank 14 and the damper wire 44 as in an automatic piano, a versatile mounting position can be realized because no hammer stopper is provided at this position.

Next, a second embodiment of the present invention will be described with reference to FIG. This figure shows a mechanism for changing the timing at which the regulating button 35 changes the direction of movement of the jack 33. In this embodiment, a linear cam 203 is used in place of the rod-shaped cam 106. More specifically, a translation cam 203 is held by a well-known action bracket 201 via a guide 202. This linear motion cam 2
A projection 203A is formed on the lower surface of the reference numeral 03. 1m
Regulator bracket 20 having flexibility of about m
0 is provided in contact with the lower surface of the translation cam 203.
Then, when the translation cam 203 moves horizontally as shown in FIG. 9 ((a) in the figure), the projection 203A of the translation cam 203 flexes the regulating bracket 200 at a predetermined position (see FIG. 9). b)). As a result, as in the first embodiment, the regulating button 28 is lowered by about 1 mm. Other configurations and operations are the same as those of the first embodiment.

FIG. 10 shows a third embodiment of the keyboard instrument according to the present invention. The present invention relates to, for example, FIG.
As shown in (B) and (C), by configuring the linear motion cam and the regulation grail, the present invention can be applied to a grand piano. That is, the well-known shank rail 210 holds the well-known regreting rail 211 via the flexible regulating-rail supporting member 220 having a U-shaped cross section. A well-known regulating button 209 is screwed into a lower portion of the regulating gland 211. Shank rail 210
The above-mentioned linear motion cam 203 is disposed above the regulating grail 211 below the above. Further, on the upper surface of the regulating grail 211, projections 221 having rounded corners, such as heads of round screws, are fixed at predetermined intervals. Further, as in the first embodiment, also in this embodiment, a pin and a hammer stopper are provided outside the rotation range of the hammer felt. Other configurations are the same as those of a well-known grand piano. Then, when the translation cam 203 moves horizontally ((B) in the drawing), the projection 203A of the translation cam 203 is moved to the predetermined position at the predetermined position.
11 is lowered ((C) in the figure). As a result, the regulating button 209 is lowered by about 1 mm.
Therefore, in this grand piano, the time when the regulating button 209 changes the direction of movement of the jack 208 can be changed, and the touch of the key is not disturbed.
It is possible to switch between a non-stringed performance that does not generate a stringed sound and a normal performance.

[0032]

As described above, according to the present invention, the regulating button is provided by providing the blocking means outside the turning range of the hammer assembly and by providing the flexible regulating bracket. Non-stringing performance that does not generate a hammering sound without disturbing key touch,
You can switch between normal performance.

[Brief description of the drawings]

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

FIG. 2 is a plan view and a side view of the hammer according to the first embodiment of the present invention.

FIG. 3 is a plan view of various pins according to the first embodiment of the present invention.

FIG. 4 is a plan view of a pin and a hammer according to the first embodiment of the present invention.

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

FIG. 6 is a view showing a mechanism for changing the timing at which the regulating button in the string striking state changes the direction of movement of the jack according to the first embodiment of the present invention.

FIG. 7 is a view showing a mechanism for changing a timing at which a regulating button in a non-stringed state changes the direction of movement of the jack according to the first embodiment of the present invention.

FIG. 8 is a view showing a mechanism for changing a timing at which a regulating button changes a direction of movement of a jack according to a second embodiment of the present invention.

FIG. 9 is a main part view showing a mechanism for changing a timing at which a regulating button changes a direction of movement of a jack according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a main part of a mechanism for changing a timing of changing a movement direction of a jack according to a third embodiment of the present invention.

[Explanation of symbols]

11 strings, 13, 14, 15 hammer assembly, 2
8 center rail, 33 jack, 35 regulating button, 101 regulating bracket, 1
06 Bar-shaped cam (flexible means), 120 pin (blocking means), 121 hammer stopper (blocking means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-12057 (JP, A) JP-A-4-81895 (JP, A) Japanese Utility Model Application No. Sho 51-67732 (JP, U) Japanese Utility Model Application No. Sho 62- 173792 (JP, U) JP-A-56-99585 (JP, U) JP-A-51-150130 (JP, U) Patent 2988134 (JP, B2) Patent 3203784 (JP, B2) JP-B 61-19040 (JP) , B2) JP-B-52-8176 (JP, B2) JP-B-43-9273 (JP, B1) JP-B-57-5556 (JP, Y2) JP-B-47-22585 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) G10C 3/00 G10C 3/16

Claims (1)

(57) [Claims] 1. A stretched string, a hammer assembly that turns and strikes the string, a jack that pushes up and escapes the hammer assembly by turning, and rotatably supports the hammer assembly. A center rail, a flexible regulating bracket held by the center rail, and a regulating button coupled to the regulating bracket and changing a movement direction of the jack by contacting a part of the jack. A keyboard provided outside the rotation range of the hammer assembly for preventing stringing of the hammer assembly; and a keyboard that flexes the regulating bracket when the stringing is prevented by the blocking unit. A keyboard instrument equipped with a flexible means.