JP2003122342A - String tensing device for piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a string tensing device for a piano which makes it possible to easily and precisely adjust fore string length and/or back string length, and the height of strings of a fore-side string pillow and/or back-side string pillow. SOLUTION: The device is equipped with a frame 1 where many strings are extended and the fore-side string pillow 4 and back-side string pillow 7 which press the extended strings S so that the fore string length FL and back string length BL are determined respectively, and at least one of the fore-side string pillow 4 and back-side string pillow 7 has a main body part 21 which presses the strings S and a support mechanism 22 which supports the main body part 21 on the frame 1 movably in the front-rear direction and also positions it vertically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension string for a piano provided with a fore side string pillow and a back side string pillow for pressing a string stretched on a frame so as to determine its forestrings length and backstrings length. Regarding the device.

[0002]

2. Description of the Related Art FIG. 10 shows a general stringing device of a conventional grand piano for its treble part. The frame 61 is made of an integral cast product,
A large number of tuning pins 62 and a large number of hitch pins 63 are provided on the front end side (the left end in the figure) and the rear end side.
Is provided. These many tuning pins 62
A large number of strings S are stretched between the hitch pin 63 and the hitch pin 63 so as to correspond to the keys (not shown) of the piano.
Is a string pillow 6 arranged in order from the tuning pin 62 side.
4, the capo / dastro bar 65, the long piece 66, and the triangular pillow 67 are pressed in the vertical direction.

The string pillow 64 has a semicircular or triangular cross section, and is integrally provided so as to project upward from the frame 61. Capo Dastro Bar 65
Are integrally provided so as to project downward from the frame 61. The triangular pillow 67 is mounted on the upper surface of the frame 61 near the hitch pin 63. This triangular pillow 67
For example, the cross section is made of brass and has a triangular shape, has a certain predetermined height, and is attached in a state of being pressed from above by the tension of the string S stretched. Long piece 66
Is provided so that its upper surface projects above a virtual line connecting the lower end of the capo dastro bar 65 and the upper end of the triangular pillow 67.

The string S is given an upper lever (pressed upward) by the string pillow 64 and a lower lever by the capo-dastro bar 65, placed on the long piece 66, and the front and rear piece pins 6 on its upper surface.
The triangular pillow 67 is stretched while being engaged with 6a and 66b. Then, the string S stretched in this manner is pushed at a predetermined position between the capo-dastro bar 65 and the piece pin 66a on the front side of the long piece 66 in accordance with the depression of a corresponding keyboard (not shown). The hammer 68 strikes a string from below to cause vibration, and the vibration is transmitted to the soundboard 69 via the long piece 66, whereby a piano sound is generated. In this manner, the capo-dastro bar 65 and the piece pin 66a on the front side of the long piece 66 define the speaking length (string length) SL that is the original sounding portion of the string S.

Further, the forestring length FL of the string S is determined by the string pillow 64 and the capo dastro bar 65 provided as described above, thereby forming the fore aliquot, and the rear side of the long piece 66. The back aliquot is configured by the back strings length BL being determined by the piece pins 66 b and the triangular pillow 67. The ratio of the forestrings length FL and the backstrings length BL to the speaking length SL is set to be an integer ratio, respectively, thereby enriching the overtone due to the resonance with the original sounding portion of the string S. By doing so, I try to get rich tones. Conventionally, the adjustment of the back strings length BL is performed by directly striking the side surface of the triangular pillow 67 with a tool such as a hammer in a stretched state to adjust the position of the triangular pillow 67 in the front-rear direction. .

Further, in order to effectively transmit the vibration energy of the string S to the soundboard 69, the triangular pillow 67 and the capo dastro bar 6 are arranged in order to optimize the pressing force of the long piece 66 by the string S.
It is necessary that the 5 and the long piece 66 have a predetermined height relationship. In this adjustment of the height relationship, the level difference between the upper surface of the long piece 66 and the imaginary line before the stringing is defined as "piece pressure", and conventionally, mainly, this piece pressure is set to a design value.
This is performed by cutting the upper surface of the long piece 66.

Further, if the string pillow 64 is too low, the value of the forestrings length FL becomes unclear, and if it is too high, the tension of the string S becomes strong, which may cause wire breakage. Adjustments are also made to the height of the. This adjustment is conventionally performed by manually cutting the upper surface of the string pillow 64 after casting the frame 61.

[0008]

In the above-mentioned conventional stringing device, since the string pillow 64 and the capo dastro bar 65 are cast integrally with the frame 61, the forestrings length FL is determined by the molding precision of the frame. The length cannot be adjusted. Further, the manual cutting work for adjusting the height of the string pillow 64 is also complicated.

Further, the positioning of the triangular pillow 67, that is, the adjustment of the back strings length BL is performed in a state where the triangular pillow 67 is in surface contact with the frame 61 after the string S is stretched. Friction between the triangle pillow 6
Since it is difficult to move 7, the adjustment work becomes very complicated. Furthermore, this adjustment is performed by directly hitting the side surface of the triangular pillow 67 that is difficult to move with a tool, so that the triangular pillow 67 is dented, and the frame 61 is also struck by mistake, The coating film of the frame 61 may be cracked. Further, since the height of the triangular pillow 67 itself is constant and the piece pressure is adjusted by cutting the upper surface of the long piece 66, the work is very complicated.

The present invention has been made to solve the above problems, and has a forestring length and / or a backstring length, and a string height in the fore side string pillow and / or the back side string pillow. An object of the present invention is to provide a string-hanging device for a piano, which can easily and accurately adjust the pitch.

[Means for Solving the Problems]

In order to achieve the above object, a stringing device for a piano of the present invention according to a first aspect of the present invention is a frame in which a large number of strings are stretched, and a string provided on the frame, and the stretched strings have their forestring lengths. And a back side string pillow that presses so as to respectively determine the length and the back strings length, and at least one of the fore side string pillow and the back side string pillow has a main body that presses the strings and a main body. And a support mechanism that positions the unit in the up-down direction while supporting the unit on the frame so as to be movable in the front-rear direction.

According to this string tension device for a piano, in the foreside chord pillow and / or the back chord pillow, the main body portion for pressing the strings is supported by the support mechanism so as to be movable in the front-rear direction of the frame. , Vertically positioned. For this reason, when the fore side string pillow is configured as such, unlike the conventional string pillow that is provided integrally with the frame, by moving the main body part in the front-back direction by the support mechanism, the forestring length is increased. Since the height can be adjusted, a desired forestring length can be obtained. Moreover, the height of the foreside chord pillow can be adjusted to a desired height by vertically positioning the main body by the support mechanism. Similarly, when the back side string pillow is configured as described above, the back strings length can be adjusted to a desired length by moving the main body portion in the front-rear direction. Further, since the height of the back-side chord pillow can be adjusted by positioning the main body portion in the vertical direction, it is possible to easily obtain the designed piece pressure without cutting the pieces.

In this case, the support mechanism is provided with an adjusting screw screwed in the main body in a vertically movable manner and an immovable vertically in the lower end of the adjusting screw to support the main body on the upper surface of the frame. And a ball that can roll freely.

According to this structure, the main body is supported by the frame by the balls that can roll. For this reason, the fore string chord pillow and / or the back chord pillow can be easily moved in the front-rear direction with little friction even after the string is stretched, so that the fore string length and / or the back string length can be increased. Can be easily and accurately adjusted. In addition, by turning the adjusting screw screwed into the main body, the main body moves in the vertical direction relative to the adjusting screw and the ball immovably provided on the adjusting screw, thereby positioning the main body.
As described above, since the main body can be positioned in the vertical direction steplessly by the adjusting screw, the height of the foreside chord pillow and / or the back chord pillow can be easily and accurately adjusted.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a stringing device for a grand piano according to a first embodiment of the present invention with respect to its treble portion. As shown in this figure, the basic structure of this stringing device is almost the same as the above-mentioned conventional stringing device. That is, the frame 1 is made of an integrally cast product, and a large number of tuning pins 2 and hitch pins 3 (only one of each is shown in the same figure) are provided at the front end (the left end in the same figure) and the rear end thereof. , And strings S are stretched between these pins 2 and 3, respectively. In the treble part, three strings S are provided for each keyboard (not shown) (1 in the figure).
Only the book is shown), and these three strings S form a set of strings S. Each string S includes a foreside string pillow 4, a capo dastro bar 5, a long piece 6, which are arranged in order from the tuning pin 2 side.
And, it is pressed in the vertical direction by the back side string pillow 7. Fore side string pillow 4, tuning pin 2 and capo
In the middle between the dastro bar 5 and the back side string pillow 7,
The hitch pins 3 are placed on the upper surface of the frame 1 at positions slightly forward of the hitch pins 3, respectively.

2 to 4 show the fore side chord pillow 4 and the back chord pillow 7, and as shown in the figure, both 4 and 7 have the same structure. The fore side chord pillow 4 and the back chord pillow 7 include a main body 21 that presses a set of strings S, and a left and right that supports the main body 21 in the frame 1 so as to be movable in the front-rear direction and the left-right direction, and positions in the up-down direction. 1
It is composed of a pair of support mechanisms 22 and 22. The main body portion 21 is composed of a base 23 and a pillow portion 24 projecting upward from the base 23 and on which the strings S are stretched. For example, die casting of brass or the like, or a preformed base 23 and pillow. It is formed by brazing with the portion 24. The base 23 is
It is formed in the shape of a rectangular parallelepiped having a low height, and screw holes 25, 25 penetrating in the vertical direction are formed at the center of the left and right ends thereof.
Each is provided. Further, at the left and right ends of the lower surface of the base 23, the recesses 26, 26 for accommodating the support mechanism 22
Are formed. Each recess 26 extends on both sides of the screw hole 25 in the front-rear direction and is formed in a square hole shape. In addition, the pillow portion 24 has a triangular cross section and has screw holes 25, 25.
It is located between.

Each support mechanism 22 has a support plate 27 that partially protrudes downward from the main body 21 and contacts the frame 1 via balls 27a, and an adjusting screw 28 screwed into a screw hole 25 of the main body 21. Is equipped with. This support plate 27
Is an elongated rectangular parallelepiped extending in the front-rear direction.
6, balls 27a, 27a are rollably provided at the front and rear ends of the lower surface thereof. A mounting hole 27b penetrating in the vertical direction is provided in the central portion of the support plate 27. Meanwhile, the adjusting screw 28
Is a large-diameter first screw portion 28a screwed into the screw hole 25.
And a second screw portion 28b having a smaller diameter on the tip side thereof. The second screw portion 28b is used for the support plate 2
7 is loosely passed through the mounting hole 27b, and the lock nut 28c is fitted to the tip end thereof. With the above configuration, the support plate 27 is rotatable with respect to the adjusting screw 28, and the support plate 27 and the balls 27a attached to the support plate 27.
Is movable in the vertical direction together with the adjusting screw 28.
Therefore, by turning the adjusting screw 28, the main body portion 21 moves vertically relative to the ball 27a, whereby the fore side string pillow 4 and the back string pillow 7 mounted on the frame 1 are moved. The height of can be adjusted arbitrarily.

The capodastro bar 5 extends in the left-right direction,
It is formed integrally with the frame 1 so as to project downward. On the lower surface of the capodastro bar 5, a bearing 5a having an inverted triangular cross section is formed so as to project. The bearing 5a is formed by, for example, casting the frame 1 and then cutting it with an NC machine.

The long piece 6 is adhered to the upper surface of the soundboard 8 and extends in the left-right direction, and a large number of piece pins 6a, 6b are provided on the upper surface.
Is attached.

As in the conventional case, the string S is given an upper prying by the string pillow 4 and a lower prying by the capo dastro bar 5.
It is mounted on a long piece 6, is engaged with front and rear piece pins 6a and 6b on the upper surface thereof, and is stretched in a state in which a triangular pillow 7 is provided with an upper lever. Then, the string S stretched in this manner is pressed by the corresponding key (not shown) on the keyboard.
At a predetermined position between the dust bar 5 and the piece pin 6a on the front side of the long piece 6, the hammer 9 vibrates the string by hitting it from below, and this vibration is transmitted to the soundboard 8 via the long piece 6. By doing so, a piano sound is generated.

According to the stringing device having the above structure, the foreside string pillow 4 is moved in the front-rear direction on the frame 1 via the ball 27a of the support mechanism 22 so as to be provided integrally with the frame. Unlike the string pillow, the forestring length FL can be continuously and continuously adjusted. Similarly, the back strings length BL can also be adjusted by moving the back-side string pillow 7 in the front-rear direction. In these cases, the foreside string pillow 4 and the back string pillow 7 can be easily moved via the ball 27a with little friction even after the stringing. Therefore, it is possible to easily and accurately adjust the forestrings length FL and the backstrings length BL.
Further, by rotating the foreside string pillow 4 and the back string pillow 7 on the frame 1, the forestring length FL and the backstring length BL of the string S can be uniformly aligned for each string S of each set. it can. As a result of the above, rich tone colors due to the fore and back aliquots can be obtained.

Further, by turning the adjusting screw 28 of the back side string pillow 7, the main body portion 21 can be moved in the vertical direction. As a result, the height of the back-side string pillow 7 can be adjusted easily and accurately, and thus the piece pressure of the design value can be easily and surely obtained without cutting the long piece 6. Similarly, by turning the adjusting screw 28 of the fore side string pillow 4, its height can be adjusted to an optimum height with high precision.

FIGS. 5 and 6 show a fore side chord pillow 31 and a back chord pillow 32 according to the second embodiment of the present invention. As shown in FIG. 5, both 31 and 32 have the same structure. Have Further, the fore side string pillow 31 and the back side string pillow 32 are the fore side string pillow 4 of the first embodiment.
The basic structure is the same as that of the back side pillow 7 and the adjustment screw 35 is screwed into the screw holes 34a formed at the four corners of the base 34 of the main body 33 from above, and the base 34 is It is different in that a rolling ball 36 is provided at the lower end portion of the adjusting screw 35 protruding from.

As described above, the fore side chord pillow 31 and the back chord pillow 32 are supported by the frame 1 via the balls 36 provided at the lower end of the adjusting screw 35. Therefore, similar to the fore side string pillow 4 and the back side string pillow 7 of the first embodiment, the fore side string pillow 31 and the back side string pillow 32 are moved in the front-rear and left-right directions in a state where there is little friction even after stringing. Can be moved to. Also, the adjusting screw 35
By turning, the height of the main body 33 can be positioned steplessly in the vertical direction. Therefore, the effects described above according to the first embodiment can be similarly obtained.

7 and 8 show a back chord pillow 41 according to a third embodiment of the present invention. As shown in these figures, the back side string pillow 41 is for placing and pressing a plurality of sets of strings S. The back-side string pillow 41 includes a main body 42 that presses the strings S, and a plurality of (six in this example) that support the main body 42 in the frame 1 so as to be movable in the front-rear direction and the left-right direction and position in the up-down direction. It is constituted by the support mechanism 43. The main body part 42 is composed of a base 44 and a plurality of (six in this example) pillow parts 47 projecting upward from the base 44 and straddling the strings S of each set, and these are integrated by casting. It is molded. Base 44
Has a predetermined shape surrounded by left and right straight portions that are parallel to each other and front and rear curved portions that obliquely connect the ends of both the straight portions. A total of 6 screw holes 45 are provided in each of the two front and rear positions so as to penetrate in the vertical direction (only the front three holes are shown in FIG. 8). A positioning recess 46 is provided near the screw hole 45 on the upper surface of the base 44.

The six pillows 47 are provided at predetermined positions on the upper surface of the base 44 so as to be diagonally aligned in the left-right direction, and have the same shape and dimensions. The pillow portion 47 has a triangular cross section, and the top portions of the triangular cross section are arranged to be parallel to each other.

The support mechanism 43 includes an adjusting screw 48 screwed into the screw hole 45 of the main body 42 and the adjusting screw 4
A ball 49 is provided at the lower end of 8 so as to be rotatable and supports the main body 42 on the frame 1.

As described above, the back-side string pillow 41 is supported by the frame 1 via the balls 49 of the support mechanism 43. Therefore, like the back-side string pillow 7 of the first embodiment, the back-side string pillow 41 can be moved in the front-rear direction and the left-right direction even after the string is stretched, in a state with less friction. Also, by turning the adjusting screw 48, the main body 4
The height of 2 can be positioned steplessly in the vertical direction. Therefore, the above-described effects of the back-side string pillow 7 of the first and second embodiments can be similarly obtained. Further, the back side string pillow 41 can be moved by applying a tool such as a punch to the positioning recess 46 provided on the upper surface of the base 44 and hitting it with a hammer or the like. Therefore, when the back-side string pillow 41 is moved, unlike the conventional case, there is no possibility of directly hitting the pillow portion 47 with a tool, so that the pillow portion 47 does not have to be deformed and the frame 1 does not hit accidentally. It is possible to prevent the coating film of the frame 1 from cracking.

FIG. 9 shows a modification of the first embodiment, in which the groove 5 formed on the surface of the frame 1 is shown.
In one, fore side chord pillow 4 and / or back chord pillow 7
Is housed. The length of the groove 51 in the left-right direction is set to be slightly longer than that of the main body portion 21, while the length in the front-back direction (depth direction of the drawing) is set to the main body portion 2.
It is set to a predetermined length that is considerably longer than that of 1. Therefore, by the groove 51, the fore side string pillow 4
Also, the back-side string pillow 7 can be moved in the front-rear direction while restricting the movement thereof in the left-right direction, and the forestrings length FL and / or the backstrings length BL can be adjusted intensively.

In the first and second embodiments, the present invention is applied to both the fore side chord pillow and the back chord pillow, but it may be applied to only one of them.
The configuration of the back side string pillow according to the third embodiment may be applied to the fore side string pillow. In addition, within the scope of the present invention,
The detailed configuration can be changed as appropriate.

[0031]

As described above, according to the stringing device for a piano of the present invention, the forestrings length and / or the backstrings length, and the foreside string pillow and / or
Alternatively, there is an effect that the height of the strings in the back-side string pillow can be easily and accurately adjusted.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a treble part of a stringing device for a grand piano according to a first embodiment of the present invention.

2 is a plan view of the fore side chord pillow of FIG. 1. FIG.

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

4 is a cross-sectional view taken along the line BB in FIG.

FIG. 5 is a plan view of a foreside chord pillow according to a second embodiment of the present invention.

FIG. 6 is a side view of a fore side chord pillow according to a second embodiment of the present invention.

FIG. 7 is a plan view of a back chord pillow according to a third embodiment of the present invention.

FIG. 8 is a partial front view of a frame where a back side string pillow is provided according to a third embodiment of the present invention.

FIG. 9 is a partial front view of a frame including a fore side chord pillow showing a modified example of the first embodiment.

FIG. 10 is a side sectional view of a conventional stringing device corresponding to FIG. 1.

[Explanation of symbols]

1 frame 4 Fore side string pillow 7 Back side string pillow 21 body 22 Support mechanism 28 Adjustment screw 27a ball 31 Fore side string pillow 32 Back side string pillow 33 Body 35 Adjustment screw 36 balls 41 back side string pillow 42 Body 43 Support mechanism 48 adjusting screw 49 balls S string FL forestrings length BL back strings length

Claims (2)

[Claims] 1. A frame on which a large number of strings are stretched, and a foreside string pillow which is provided on the frame and presses the stretched strings so as to respectively determine a forestrings length and a backstrings length thereof. And a back-side string pillow, and at least one of the fore-side string pillow and the back-side string pillow supports a main body part that presses the strings and the main body part so as to be movable in the front-rear direction in the frame. In addition, a stringing device for a piano, which has a supporting mechanism for positioning in the vertical direction. 2. The support mechanism is provided with an adjusting screw screwed into the main body so as to be able to advance and retreat in the vertical direction, and is provided at the lower end of the adjusting screw so as to be immovable in the vertical direction, and is provided on the upper surface of the frame. The stringing device for a piano according to claim 1, further comprising: a rollable ball that supports the main body.