JP3680467B2 - Keyboard instrument pedal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pedal structure for operating an operating mechanism such as a sostenuto mechanism in accordance with the operation of a pedal in a keyboard instrument such as a grand piano.
[0002]
[Prior art]
FIG. 1 shows a pedal structure operated by a sostenuto pedal used in a conventional normal grand piano. In the figure, reference numeral 1 denotes a push-up rod that moves up and down as the sostenuto pedal swings. A capstan screw 2 is attached to the upper end of the push-up rod 1, and the capstan screw 2 pushes up a contact portion 4 provided at one end of the sostenuto pedal lever 3 as the push-up rod 1 moves up. As a result, the sostenuto pedal lever 3 rotates around a fulcrum 6a in the support 6 projecting below the shelf plate 5, and the lowering shaft 7 attached to the other end of the sostenuto pedal lever 3 is lowered. .
[0003]
The upper end of the lowering shaft 7 is connected to the sostenuto rod 8, and when the lowering shaft 7 is lowered, the sostenuto rod 8 is rotated. The sostenuto rod 8 is provided with blades 9. When the sostenuto rod 8 is rotated and the blades 9 are in a horizontal state as shown in the drawing, the sostenuto rod 8 is lifted by a key depression immediately before the sostenuto rod 8 is rotated. A damper block tab lip (not shown) locks onto the vanes 9 and keeps the corresponding dampers spaced from the strings. Thus, as is well known, the sound corresponding to the key depression immediately before the player depresses the sostenuto pedal is extended even after the player releases the key.
[0004]
A regulation screw 10 and a resistance spring 11 are attached to the lower surface of the shelf board 5. The regulating screw 10 abuts against the abutting portion 4 when the push-up rod 1 is raised, thereby restricting the stroke of the push-up rod 1. The resistance spring 11 urges the sostenuto pedal lever 3 to return to the initial position, thereby giving the player a sense of resistance when depressing the sostenuto pedal.
[0005]
FIG. 2 shows a similar pedal structure used in a conventional automatically playable grand piano. As shown in the figure, the shelf plate 5 is provided with an opening 12, and a key pressing device 14 having a large number of solenoid units 13 is disposed in the opening 12. Each solenoid unit 13 is configured to push up the rear end of each key 15 on the keyboard, thereby performing the same operation of the key 15 as that performed by the performer.
[0006]
In FIG. 2, the position of the fulcrum 6 a of the sostenuto pedal lever 3 is changed to avoid the key pressing device 14, and the rotation of the sostenuto pedal lever 3 is transmitted to the sostenuto rod 8 via the push-up shaft 17. It has become.
[0007]
[Problems to be solved by the invention]
By the way, in any of the pedal structures described above, the push-up rod 1 and the sostenuto rod 8 are interlocked via the sostenuto pedal lever 3 and the shaft 7 or 17, so that the sostenuto depends on the type of piano. Appropriate lengths of the pedal lever 3 and the shaft 7 or 17 must be determined in advance. Accordingly, the sostenuto pedal lever 3 and the shaft 7 or 17 cannot be made common in a plurality of models. The resistance spring 11 also has an appropriate spring constant or the like according to the piano model, and cannot be shared by a plurality of models.
[0008]
In the pedal structure of FIG. 2, the sostenuto rod 8 and the key press device 14 are close to each other. Therefore, in order to avoid hitting the key press device 14, the push-up shaft 17 must be formed in a complicated shape. Don't be. For this reason, the strength of the push-up shaft 17 has to be low, and there is a possibility that it cannot withstand long-term use.
[0009]
The present invention has been made in consideration of the above circumstances, and can be used in common for a plurality of types of keyboard instruments, and the useful life of a keyboard instrument having a complicated internal structure is also reduced. An object of the present invention is to provide a pedal structure for a keyboard instrument that can be easily installed without inviting the instrument.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, a pedal structure of a keyboard instrument according to the present invention includes a pedal that is swingable, a push-up rod that moves up and down in response to the swing of the pedal, and an upper and lower portion of the push-up rod. A first link that operates in response to movement, a flexible elongate body having one end attached to the first link, and the other end of the flexible elongate body attached to the first link. A second link that operates in accordance with the second link; an operating mechanism that operates in conjunction with the second link; and first resistance means that applies force in a direction to return the push-up rod to an initial position. To do.
[0011]
According to the present invention, the push-up rod and the operating mechanism are interlocked with each other via a flexible long member such as a wire, so that depending on factors such as the distance between them and the arrangement of other members. If the length of the flexible long member is determined, the first and second links can be shared by a plurality of types of keyboard instruments. Moreover, even if the inside of the keyboard instrument is complicated and complicated like a keyboard instrument that can be played automatically, the flexible elongated member can be easily installed and has a long service life. There will be no decline.
[0012]
Furthermore, when the push-up rod and the operating mechanism are simply linked via a flexible long member, there is no element that positively provides resistance when the player depresses the pedal. For example, the resistance is given by the frictional force between the flexible long member and the holding body (for example, a sheath) that holds the flexible long member inside. However, such a frictional force tends to fluctuate at an unexpected time, which may give the player a sense of incongruity.
[0013]
On the other hand, in this invention, the 1st resistance means which gives force in the direction which returns a thrust rod to an initial position is provided. By this first resistance means, when the player depresses the pedal, a reaction force is applied to the pedal so that the player can feel this. The reaction force by the first resistance means is made sufficiently larger than, for example, the reaction force caused by the friction between the flexible long member and the sheath that holds the flexible long member, or the flexible long member. By making the frictional force between the member and the holding body extremely small, the player feels substantially only the reaction force by the first resistance means. Here, by making the reaction force of the first resistance means reproducible, the performer can perform without feeling uncomfortable.
[0014]
In the present invention, it is preferable that second resistance means for applying a force in a direction to return the second link to the initial position is provided, and the force of the second resistance means is smaller than the force of the first resistance means.
According to this, when the player stops depressing the pedal and the pedal, the push-up rod, etc. return to the initial position by the force of the first resistance means, the second resistance means causes the second link. And the operating mechanism is also reliably returned to the initial position. Further, by making the force of the second resistance means smaller than the force of the first resistance means, the force of the second resistance means does not significantly affect the reaction force when the player steps on the pedal. Is possible.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a pedal structure of a keyboard instrument according to an embodiment of the present invention will be described with reference to the drawings.
1. First embodiment
(1) Overall composition of keyboard instrument
First, FIG. 3 is a side sectional view showing an upper portion of a grand piano provided with a pedal structure according to an embodiment of the present invention. In the figure, reference numeral 20 denotes a shelf board, and the shelf board 20 is horizontally fixed to the upper end of a leg 21 via a leg girder 22. A pedal holder 23 is fixed to the lower surface of the shelf board 20, and a pedal head 24 is suspended via the pedal holder 23, and a pedal suspension 25 extending downward is supported on the pedal head 24. .
[0016]
A frame-shaped casket 26 is placed above the shelf board 20, and a key 27 is supported above the casket 26. The key 27 is rotatable through a balance pin 28 projecting from the bowl 26 so that a player can perform by pushing down the front end portion on the left side in the drawing. In this way, a plurality of keys 27 are juxtaposed in the left-right direction, which is the direction perpendicular to the paper surface of the drawing, to constitute a keyboard.
[0017]
A storage hole 30 is formed behind the shelf board 20. As shown in FIG. 4, the storage hole 30 is formed long on the left and right sides of the shelf board 20 (in the direction perpendicular to the paper surface of the drawing). As shown in FIG. ing. The key pressing device 31 is provided with the same number of solenoid units 32 as the number of keys 27. During automatic performance, the solenoid unit 32 pushes up the rear end of the corresponding key 27 so that the key 27 is rotated. It has become.
[0018]
The same number of hammer action mechanisms 34 as the key 27 are provided above the hook 26. When the performer or the solenoid unit 32 rotates the key 27, the corresponding hammer action mechanism 34 is operated, and the hammer action mechanism 34 is operated. A string 35 strikes a string (not shown in FIG. 3) to generate a sound.
[0019]
On the back side of the hammer action mechanism 34, a damper action mechanism 40 for holding a string is provided. Reference numeral 41 denotes a damper rail provided over the entire length of the keyboard. One end of a damper lever 43 extending in the front-rear direction is rotatably coupled to the damper rail 41 via a damper lever flange 42. The damper lever 43 is provided corresponding to each key 27. A damper block 44 is rotatably attached to a front end portion which is a free end portion of the damper lever 43, and a damper wire 45 extending upward is attached to the damper block 44.
[0020]
A damper (not shown) for holding the string from above is attached to the upper end of the damper wire 45. According to the damper action mechanism 40, the damper lever 43 is pushed up by the rear end portion of the rotated key 27, and the damper is separated from the string immediately before the hammer 35 strikes the string. Therefore, the resonance of the string corresponding to the key 27 that is not pressed is prevented.
[0021]
(2) Pedal structure
FIG. 5 is a rear view of the pedal suspension 25 described above. As shown in the figure, a pedal support portion 50 is attached to the lower end of the pedal suspension 25. The pedal support 50 is provided with a loud pedal 51, a sostenuto pedal 52, and a shift pedal 53 from the left to the right in the drawing. FIG. 5 shows the back side of the grand piano. As is well known, these pedals 51 to 53 swing on the front side of the grand piano when depressed by the performer. Yes.
[0022]
The lower ends of the push-up rods 54 and 55 are connected to the loud pedal 51 and the shift pedal 53, respectively. The upper ends of the push-up rods 54 and 55 are connected to the plungers 60 and 59 of the solenoid units 58 and 59 via the universal joints 56 and 57, respectively. It is connected to the lower end of 61. The plungers 60 and 61 are inserted through solenoids 64 and 65 accommodated in the housings 62 and 63, respectively, so as to be movable in a substantially vertical direction, and in both directions above and below the housings 62 and 63 accommodating the solenoids 64 and 65. It protrudes. Capstan screws 66 and 67 are attached to the upper ends of the plungers 60 and 61. The housings 62 and 63 are attached to a fixed plate 68 fixed to the pedal suspension 25.
[0023]
By connecting the loud pedal 51 and the plunger 60 in this way, when the performer depresses the loud pedal 51, the push-up rod 54 is pushed up, and the plunger 60 is also pushed up. Further, since the shift pedal 53 and the plunger 61 are connected, when the performer depresses the shift pedal 53, the push-up rod 55 is pushed up, and the plunger 61 is also pushed up. On the other hand, during automatic performance, when the solenoids 64 and 65 of the solenoid units 58 and 59 are excited and the plungers 60 and 61 are raised, the plungers 60 and 61 are lifted up and the loud pedal 51 or the shift pedal 53 swings.
[0024]
As shown in FIG. 4, a loud pedal lever 70 and a shift pedal lever 71 are supported on the back surface of the shelf board 20. The loud pedal lever 70 and the shift pedal lever 71 are swingable in a vertical plane (corresponding to a plane perpendicular to the paper surface) around the fulcrum portions 70a and 71a, respectively.
[0025]
When the plunger 60 connected to the loud pedal 51 is raised, the capstan screw 66 of the plunger 60 pushes up the end portion 70b of the loud pedal lever 70 to swing the loud pedal lever 70. Thereby, the lifter 46 of the damper action mechanism 40 shown in FIG. 3 is lifted, and all the damper levers 43 are lifted accordingly, so that all the dampers are separated from the strings all at once. In this way, a stringed sound is extended even after any key 27 is released, and a loud sound is generated even when a string corresponding to any key 27 is struck. ing.
[0026]
When the plunger 61 connected to the shift pedal 53 is raised, the capstan screw 67 of the plunger 61 pushes up the end 71 b of the shift pedal lever 71 to swing the shift pedal lever 71. 3 moves together with the hammer action mechanism 34 in the direction perpendicular to the paper surface, that is, in the lateral direction. At this time, even if the key 27 rotates, the hammer 35 strikes a smaller number of strings than usual, so that the generated sound becomes smaller than usual. As described above, the pedal mechanism of the loud pedal 51 and the pedal mechanism of the shift pedal 53 are operated both in the case of manual performance by the performer and in the case of automatic performance.
[0027]
Now, as shown in FIG. 5, the lower end of the push-up rod 72 is connected to the sostenuto pedal 52. A capstan screw 73 is attached to the upper end of the push-up rod 72. Further, the vicinity of the upper end portion of the push-up rod 72 is inserted through a cushioning material 80 fixed to a support frame 76 fixed to the fixing plate 68. The cushioning material 80 is made of felt, cloth, resin, or rubber, supports the capstan screw 73 so as not to tilt, and guides the vertical movement of the push-up rod 72. In this way, when the performer depresses the sostenuto pedal 52, the push-up rod 72 is pushed up. In this embodiment, a solenoid unit is not used for the pedal mechanism of the sostenuto pedal 52, and the pedal mechanism of the sostenuto pedal 52 is operated only in the case of manual performance by the performer.
[0028]
Near the upper end of the push-up rod 72, a first resistance means 75 is provided that provides a reaction force that pushes the push-up rod 72 downward. First, in the vicinity of the upper end portion of the push-up rod 72, the cushioning material 80 fixed to the support frame 76 is inserted. The support frame 76 is a bowl-shaped member that is greatly open upward, and a hole through which the push-up rod 72 is inserted is formed at the bottom. The support frame 76 is formed with flanges 77, and these flanges 77 are screwed to the fixing plate 68.
[0029]
Below the support frame 76, the push-up rod 72 is inserted through a coil spring 78 and a ring 79. The ring 79 is screwed to the push-up rod 72, and the coil spring 78 is sandwiched between the bottom surface of the bottom of the support frame 76 and the ring 79. In this manner, the coil spring 78 always applies a downward force to the push-up rod 72. Therefore, when the performer depresses the sostenuto pedal 52 and the push-up rod 72 rises, the coil spring 78 supported by the support frame 76 applies a reaction force to the push-up rod 72 through the ring 79, and the player At this time, an appropriate resistance is felt. When the player releases the force applied to the sostenuto pedal 52, the push-up rod 72 is pushed down by the force of the coil spring 78.
[0030]
Now, as shown in FIG. 6, a bracket 81 is fixed to the lower surface of the shelf board 20. The bracket 81 includes a flat plate-like upper portion 81a that is screwed to the lower surface of the shelf board 20, and two flat plate-like side portions 81b and 81c that are bent downward from the upper portion 81a. One side portion 81b of the bracket 81 is formed shorter than the other side portion 81b, and a first lever (first link) 82 is attached to the side portion 81b via a pin 83. ing. The first lever 82 includes one arm portion 84 suspended from the pin 83 and the other arm portion 85 orthogonal to the arm portion 84, and is rotatable with the pin 83 as a fulcrum.
[0031]
A cushioning material 86 made of felt, resin, or rubber is fixed to the lower surface of the arm portion 85 of the first lever 82. When the push-up rod 72 is raised as described above, the capstan screw 73 is cushioned. The first lever 82 is rotated in the clockwise direction in FIG. A cushioning material 87 made of felt, resin, or rubber is also fixed to the upper surface of the arm portion 85, and the cushioning material 87 is covered with a cloth 88. A regulation screw 89 that opposes the cross 88 is attached to the lower surface of the shelf board 20, and when the first lever 82 rotates in the clockwise direction, the cross 88 contacts the regulation screw 89 and the cushioning material 87 is buffered. It is like that. The rise of the push-up rod 72 is restricted by the restriction screw 89. In other words, the stroke of the push-up rod 72 is determined.
[0032]
Further, a bent portion 81d is bent from the one side edge of the other side portion 81c of the bracket 81 toward the front side of the drawing. A socket 91 into which one end of a wire (flexible long body) 90 is inserted is fixed to the bent portion 81d. The socket 91 is a substantially cylindrical hard member, and a flexible sheath 92 that holds the wire 90 is joined to one end of the socket 91. Further, the end of the wire 90 is exposed from the other end of the socket 91, and this end is fixed to the pin 93. The pin 93 is rotatably attached to the arm portion 84 of the first lever 82, and the wire 90 extends in the tangential direction of the virtual circle around the pin 83 in the vicinity of the pin 93.
[0033]
Here, the inner diameters of the socket 91 and the sheath 92 are made larger than the diameter of the wire 90, and the wire 90 is slidable inside these. In this way, when the first lever 82 rotates clockwise, the wire 90 is pulled by the pin 93 and slides inside the socket 91 and the sheath 92.
[0034]
Now, the other end of the wire 90 is inserted into the socket 94, and the socket 94 is fixed to the bracket 95. The bracket 95 has a side portion 95a that is screwed to the top of the grand piano, and a bottom portion 95b that is bent at a right angle to the side portion 95a. The socket 94 is fixed to the bottom portion 95b. The socket 94 is a substantially cylindrical hard member, and the sheath 92 is joined to one end thereof. Further, the end of the wire 90 is exposed from the other end of the socket 94, and this end is fixed to the pin 96. The inner diameter of the socket 94 is also made larger than the diameter of the wire 90, and the wire 90 can slide inside the socket 94.
[0035]
In the figure, reference numeral 97 denotes a cylindrical sostenuto rod. The sostenuto rod 97 is supported by a bearing (not shown) fixed to the top of the grand piano, and is rotatable about the axis of the sostenuto rod 97. A hard blade 98 protrudes from the side surface of the sostenuto rod 97, and the blade 98 extends along the axial direction of the sostenuto rod 97.
[0036]
A second lever (second link) 99 is screwed to the side surface of the sostenuto rod 97 on the side opposite to the blades 98, so that the second lever 99 has the sostenuto rod 97 as a rotation axis. Rotate. The second lever 99 is J-shaped, and the above-described pin 96 is included in the curved end portion thereof. As shown in FIG. 7, a circumferential groove 100 is formed at the end of the second lever 99, and a wire 90 is passed through the circumferential groove 100. In this way, the pin 96 is rotatable within the curved end of the second lever 99. Then, as described above, when the first lever 82 rotates clockwise in FIG. 6 and the wire 90 is pulled, the second lever 99 rotates about the sostenuto rod 97 in the counterclockwise direction in FIG. Rotate. As a result, the blade 98 protruding from the sostenuto rod 97 is lifted.
[0037]
As shown in FIG. 6, the lower end portion of the coil spring (second resistance means) 101 is locked to the second lever 99. The upper end portion of the coil spring 101 is locked to the ring 103 of the hook 102 fixed to the upper part of the grand piano. In order to lock the lower end of the coil spring 101, a hole 104 is formed in the curved end of the second lever 99 as shown in FIG.
[0038]
The second lever 99 is constantly urged clockwise by the coil spring 101 in FIG. Therefore, unless the performer depresses the sostenuto pedal 52 to raise the push-up rod 72, the blade 98 protruding from the sostenuto rod 97 faces obliquely downward as shown in the figure. Further, the wire 90 is pulled toward the coil spring 101 unless the push-up rod 72 is raised.
[0039]
As described above, when the performer depresses the sostenuto pedal 52 against the force of the coil spring 78, the second lever 99 rotates counterclockwise in FIG. 6, and the blade 98 is lifted. FIG. 8 shows the blade 98 at this time. The blade 98 is in a substantially horizontal state.
[0040]
When the key 27 is turned (= depressed) by the player's key depression, the damper lever 43 is pushed up by the rear end portion of the key 27 and the damper wire 45 is raised. Similarly, when the rear end of the key 27 is pushed up by the solenoid unit 32, the damper lever 43 is pushed up and the damper wire 45 is raised. A damper 47 is attached to the upper end of the damper wire 45, and the damper 47 is separated from the string 48 when the damper wire 45 is raised. Here, when the blade 98 is brought into a horizontal state as shown in the figure after the key 27 is rotated, the tab lip 44 a provided on the damper block 44 interposed between the damper lever 43 and the damper wire 45 is moved to the blade 98. Lock on top. Therefore, the damper 47 is held at a position separated from the string 48, and even if the key 27 returns to the normal position, the stringing sound by the hammer 35 (FIG. 3) continues. On the other hand, even if the key 27 rotates and the damper lever 43 is pushed up after the blade 98 is in the horizontal state, the tab lip 44a of the damper block 44 does not rise above the blade 98, and the key 27 is in the normal position. Immediately after returning to, the damper 47 descends and comes into contact with the string 48 to suppress the stringing sound.
[0041]
When the performer stops stepping on the sostenuto pedal 52, the push-up rod 72 is lowered by the coil spring 78. Further, the second lever 99 is rotated clockwise in FIG. 6 by the coil spring 101, the blade 98 is directed obliquely downward, and the wire 90 is pulled toward the coil spring 101.
[0042]
In this way, the blade 98 is again directed obliquely downward, so that even if the key 27 rotates and the damper lever 43 is pushed up, the blade 98 does not act on the tab lip 44a, and the key 27 returns to the normal position. Immediately thereafter, the damper 47 descends and comes into contact with the string 48 to suppress the stringing sound.
[0043]
In the sostenuto pedal structure described above, the sheath 92 that holds the wire 90 may be single, but when the length from the first lever 82 to the second lever 99 is large, a joint is used. A plurality of sheaths 92 may be connected in the axial direction, and the wire 90 may be slidably inserted into the sheaths 92.
[0044]
According to this structure, the push-up rod 72 and the sostenuto rod 97 are linked via the wire 90, so that the levers 82 and 99, the brackets 81 and 95, the coil springs can be used in a plurality of types of keyboard instruments. 78, 101, etc. can be shared. That is, when the distance between the push-up rod 72 and the sostenuto rod 97 and the arrangement of other members are different because of different models, an appropriate length of the wire 90 is prepared and the sheath 92 is cut or the joint is It can be connected to the appropriate length. Therefore, it is not necessary to prepare various types of levers 82 and 99.
[0045]
Even if the inside of the keyboard instrument is complicated because the key pressing device 31 for automatic performance is provided, the wire 90 and the sheath 92 are appropriately curved because they have flexibility. Can be installed easily. In addition, even if the wire 90 and the sheath 92 are bent, the service life is not reduced unless the curvature is very large.
[0046]
However, it is preferable that the wire 90 and the sheath 92 have as few curved portions and small curvatures as possible as shown in FIG. 4 so that the contact area between them is reduced. The sliding resistance (frictional force) between the wire 90 and the sheath 92 becomes a part of the resistance when the player depresses the sostenuto pedal 52, and the player feels uncomfortable when the frictional force fluctuates at an unexpected time. This is because the frictional force is desirably small, and in order to reduce the frictional force, the wire 90 and the sheath 92 are preferably as straight as possible. For this purpose, it is desirable to coat the outer surface of the wire 90 with a material having a low coefficient of friction such as polytetrafluoroethylene, or to interpose a lubricant between the wire 90 and the sheath 92.
[0047]
Furthermore, since one end of the wire 90 is engaged with the first lever 82 below the shelf plate 20 and the other end is engaged with the second lever 99 above the shelf plate 20, Must penetrate. Therefore, in order to prevent the curvature of the wire 90 and the sheath 92 from becoming large, as shown in FIG. 9, a through hole 105 is formed obliquely in the shelf plate 20, and the wire 90 is inserted into the inclined through hole 105. You may let the built-in sheath 92 pass. Alternatively, the size of the through hole 105 may be increased to allow the sheath 92 to be inclined.
[0048]
In order to reduce the frictional force between the wire 90 and the sheath 92, it is preferable to lengthen the arm portion 84 of the first lever 82 and increase the distance between the first lever 82 and the wire 90. According to this, even if the moment for rotating the first lever 82 is the same, the force necessary for sliding the wire 90 (that is, the tension of the wire 90) can be small. Since the frictional force between the wire 90 and the sheath 92 is a product of the friction coefficient and the tension, it is possible to reduce the frictional force by reducing the tension.
[0049]
Moreover, in the above-described structure, the coil spring 78 that applies a downward force to the push-up rod 72 is provided, and this coil spring 78 gives the player a sense of resistance when the sostenuto pedal 52 is depressed. . If an element that positively provides such resistance is not provided, this resistance is provided only by the frictional force between the wire 90 and the sheath 92 and the drag of the coil spring 101. However, as described above, the frictional force between the wire 90 and the sheath 92 tends to fluctuate at an unexpected time, which may give the player a sense of discomfort.
[0050]
On the other hand, in the above structure, when the performer depresses the sostenuto pedal 52 by the coil spring 78, a reaction force is applied to the sostenuto pedal 52 so that the performer can feel this. . The reaction force by the coil spring 78 is sufficiently larger than the friction force between the wire 90 and the sheath 92 and the drag force of the coil spring 101, and the friction force between the wire 90 and the sheath 92 is made extremely small by the above measures. Thus, the player feels only the reaction force due to the coil spring 78 substantially. Here, since the force is uniquely determined by the axial displacement of the coil spring 78, the reaction force of the coil spring 78 is reproducible, and the player can perform without feeling uncomfortable.
[0051]
Further, a force is applied to the second lever 99 connected to one end of the wire 90 in a direction to return to the initial position by the coil spring 101. According to this, when the player stops depressing the sostenuto pedal 52 and the sostenuto pedal 52 and the push-up rod 72 are returned to the initial positions by the force of the coil spring 78, the coil spring 101 causes the second lever 99 and The blade 98 is also surely returned to the initial position.
[0052]
As shown in FIG. 6 or FIG. 9, the force of the coil spring 101 may be the minimum force necessary to keep the blade 98 obliquely downward, and if it is much smaller than the force of the coil spring 78. Good. Thereby, it is possible to prevent the force of the coil spring 101 from significantly affecting the reaction force when the performer depresses the sostenuto pedal 52.
[0053]
2. Second embodiment
FIG. 10 is a schematic diagram showing a pedal structure of a keyboard instrument according to the second embodiment of the present invention. In the figure, components that are essentially the same as those in the first embodiment are given the same reference numerals. In the figure, the left shows the front of the grand piano, and the right shows the back of the grand piano.
[0054]
The sostenuto pedal 52 penetrates the pedal support portion 50 in the front-rear direction of the grand piano, and can swing around the pin 52a. A first resistance means 75 is provided inside the pedal support portion 50. That is, the coil spring 110 is disposed in the space inside the pedal support portion 50, and the upper and lower ends of the coil spring 110 are on the rear end side of the spring receiver 111 and the sostenuto pedal 52 fixed inside the pedal support portion 50. Are respectively fitted into spring receivers 112 fixed to the upper surface of each. As a result, when the player steps down the sostenuto pedal 52 and the sostenuto pedal 52 swings counterclockwise in the drawing, the coil spring 110 applies a reaction force.
[0055]
A bearing 113 made of an elastic material is inserted into the upper portion of the rear end of the sostenuto pedal 52, and the lower end of the push-up rod 72 is inserted into the bearing 113. The push-up rod 72 is penetrated by a support tube (not shown) and is substantially vertical. Thereby, when the sostenuto pedal 52 swings counterclockwise, the push-up rod 72 is pushed up.
[0056]
A stay 114 is fixed to the upper end of the push-up rod 72. The stay 114 has a horizontal plate portion 115 and a vertical cylinder portion 116 formed integrally therewith. The upper end portion of the push-up rod 72 is inserted into the vertical cylinder portion 116, and the horizontal plate portion 115 is raised. Screwed to the upper end of the rod 72. A buffer material 87 made of felt, resin, or rubber is fixed to the center of the upper surface of the horizontal plate portion 115, and the buffer material 87 is covered with a cloth 88. A regulation screw 89 that opposes the cross 88 is attached to the lower surface of the shelf board 20, and when the push-up rod 72 rises, the cross 88 comes into contact with the regulation screw 89 and the buffer material 87 is buffered. . The rise of the push-up rod 72 is restricted by the restriction screw 89. In other words, the stroke of the push-up rod 72 is determined.
[0057]
A guide 117 is projected from the lower surface of the shelf board 20, and a cylindrical internal space 118 is formed in the guide 117. A slider shaft 119 is disposed in the internal space 118 so as to be slidable in the vertical direction. The slider shaft 119 is coupled to a slider plate 120 outside the guide 117, and a slider (first link) 125 that slides in the vertical direction is formed by both.
[0058]
A claw 121 is projected from the slider plate 120. The claw 121 is disposed above the horizontal plate portion 115 of the stay 114 and is lifted by the horizontal plate portion 115 when the push-up rod 72 is raised. A buffer cloth 122 is fixed to the peripheral edge of the upper surface of the horizontal plate portion 115 of the stay 114.
[0059]
Further, a wire bracket 126 is screwed to the lower surface of the shelf board 20, and a socket 91 containing a wire 90 is fixed to the wire bracket 126. The end of the wire 90 exposed from the socket 91 is fixed to the slider plate 120 of the slider 125. In the vicinity of the slider 125, the wire 90 is oriented in the vertical direction. As a result, when the push-up rod 72 rises and the slider 125 is lifted, the wire 90 is pulled.
[0060]
The other end of the wire 90 is coupled to a pin 96 that is rotatably included in the curved end of the second lever 99. The second lever 99 is rotatable about the sostenuto rod 97, and the sostenuto rod 97 has a blade 98 protruding therefrom. Although the arrangement of the components on the second lever 99 side is different from that of the first embodiment, it is essentially the same, and the description thereof is omitted.
[0061]
In this structure, when the performer depresses the sostenuto pedal 52 against the force of the coil spring 110, the push-up rod 72 rises, lifts the slider 125, and pulls the wire 90. Then, the second lever 99 rotates counterclockwise in FIG. 10 about the sostenuto rod 97, and is lifted until the blade 98 is substantially horizontal.
[0062]
When the performer stops stepping on the sostenuto pedal 52, the coil spring 110 returns the sostenuto pedal 52 to the initial position, and the push-up rod 72 is lowered. Further, the second lever 99 is rotated clockwise in FIG. 10 by the coil spring 101, the blade 98 is directed obliquely downward, and the wire 90 is pulled toward the pin 96.
[0063]
Even in this structure, the force of the coil spring 101 applied to the second lever 99 is extremely smaller than the force of the coil spring 110 applied to the sostenuto pedal 52, so that the frictional force between the sheath 92 and the wire 90 is reduced. Measures have been taken. Also in this embodiment, it is possible to achieve the same effect as in the first embodiment.
[0064]
3. Example of change
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, Various changes are possible as follows.
(1) In the above embodiment, the present invention is applied to a grand piano that can be automatically played. However, the present invention may be applied to a normal grand piano. Further, the present invention can be applied not only to a grand piano but also to any keyboard instrument such as an upright piano, a harpsichord, a celesta, and an organ.
[0065]
(2) In the above embodiment, the pedal mechanism of the sostenuto pedal 52 is interlocked by the wire 90. However, the present invention is not limited to this, and the damper rail 41 (see FIG. 3) is interlocked by the loud pedal 51 of the grand piano. In this case, the wire 90 may be linked similarly. In this case, the loud pedal lever 70 (see FIG. 4) is abolished. In a grand piano capable of automatic performance, the first lever 82 or the slider 125 is operated by the plunger 60 of the solenoid unit 58 shown in FIG. The damper rail 41 may be operated by the second lever 99. In a normal grand piano, the first lever 82 or the slider 125 is operated by a push-up rod (corresponding to the push-up rod 72 with respect to the sostenuto pedal 52) interlocked with the sostenuto pedal 52, and the second lever 99 is used. The damper rail 41 may be operated.
[0066]
(3) The plunger of the solenoid unit is connected to the sostenuto pedal 52 in the same manner as the pedals 51 and 53 are connected to the plungers 60 and 61 of the solenoid units 58 and 59 (see FIG. 5). It is also possible to operate the first lever 82 or the slider 125 with this plunger.
[0067]
(4) Instead of the wire 90, other flexible elongated bodies such as strings and threads can be used.
[0068]
(5) In the above embodiment, the first resistance means 75 applies resistance to the push-up rod 72 or the sostenuto pedal 52. Instead, the first resistance means 75 applies to the first lever 82 or the slider 125. You may make it give resistance force with a leaf | plate spring, a coil spring, etc. FIG. In this case, the tension applied to the wire 90 increases, but the friction between the wire 90 and the sheath 92 can be reduced by making the wire 90 and the sheath 92 as straight as possible, or by interposing a substance having a low friction coefficient between the wire 90 and the sheath 92. The force may be reduced, and the ratio of the frictional force to the resistance force to the push-up rod 72 or the sostenuto pedal 52 may be reduced.
[0069]
【The invention's effect】
As described above, according to the present invention, it is possible to share components for a plurality of types of keyboard instruments. In addition, a pedal mechanism can be easily installed even in a keyboard instrument having a complicated internal configuration such as a keyboard instrument that can be automatically played. In addition, the service life is not reduced.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a pedal mechanism of a conventional grand piano.
FIG. 2 is a schematic view showing another example of a pedal mechanism of a conventional grand piano.
FIG. 3 is a side sectional view showing a grand piano to which the pedal structure of the keyboard instrument according to the first embodiment of the present invention is applied.
4 is a bottom view of the shelf plate of the grand piano of FIG. 3. FIG.
FIG. 5 is a rear view showing a part of the pedal structure according to the first embodiment.
FIG. 6 is a side view showing a part of the pedal structure according to the first embodiment.
7 is a view taken along the line VII of FIG.
FIG. 8 is a side view showing members operated by the pedal structure according to the first embodiment.
FIG. 9 is a side view showing a part of a preferred modification of the first embodiment.
FIG. 10 is a partially broken side view showing a pedal structure of a keyboard instrument according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 ... Shelf board, 40 ... Damper action mechanism, 44 ... Damper block, 44a ... Tab lip, 47 ... Damper, 50 ... Pedal support part, 52 ... Sostenuto pedal, 72 ... Push-up rod, 75 ... First resistance means, 78 ... Coil spring, 81 ... Bracket, 82 ... First lever (first link), 90 ... Wire (flexible long body), 91, 94 ... Socket, 92 ... Sheath, 95 ... Bracket, 97 ... Sostenuto rod , 98 ... blades, 99 ... second lever (second link), 101 ... coil spring (second resistance means), 110 ... coil spring, 119 ... slider shaft, 120 ... slider plate, 121 ... claw, 125 ... slider (First link), 126 ... wire bracket

Claims (2)

A swingable pedal,
A push-up rod that moves up and down in response to the swing of the pedal;
A first link that operates in response to the vertical movement of the push-up rod;
A flexible elongated body having one end attached to the first link;
A second link attached to the other end of the flexible elongated body and actuated by following the first link;
An operating mechanism interlocking with the second link;
A pedal structure for a keyboard instrument, comprising: first resistance means for applying a force in a direction to return the push-up rod to an initial position. 2. The second resistance means for applying a force in a direction to return the second link to the initial position, wherein the force of the second resistance means is smaller than the force of the first resistance means. The pedal structure of the described keyboard instrument.

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