JP2006178094A - Support mechanism for turning component of keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the support mechanism for turning components of a keyboard instrument, with which initial setting of resistance to turning of a pin can be easily performed, the plastic deformation and wear of a bearing can be prevented, the stable operation of turning components can be secured, irrespective of wet and dry conditions, and the appropriate operation of a keyboard instrument can be secured. <P>SOLUTION: The support mechanism is provided with support components (33, 11, 12, 12) for supporting the turning components (7, 12, 13, 14). Pin holes (7b, 11b, 18b and 19b) are formed on one of the turning components and the support components. The mechanism has a cylindrical body part 16 constituted of an elastic members and fibers 17 flocked on the inner peripheral surface of the body part 16 and is further equipped with the bearing 15 fixed to the pin hole and the pin 22, which is provided to the other of the turning components and the support components and engages freely turnably with the bearing 15, in a state being brought into contact with the fiber 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a support mechanism for a rotating component of a keyboard instrument that supports a rotating component that rotates when a key is pressed.

  In general, an acoustic piano uses a rotating component that rotates as the key is pressed, such as a whippen or a hammer. A center pin and a bushing cloth are used to rotatably support these rotating parts. Specifically, the pivot pin is supported by the center pin fixed to the pivot component being pivotally engaged with a cylindrical bushing cloth attached to the pin hole of the support component as a bearing. It is supported by the part so as to be rotatable. This bushing cloth is composed of wool fibers woven in a felt shape.

  However, in the above acoustic piano, the bushing cloth is made of wool fiber, so when the humidity is high, the bushing cloth expands due to moisture absorption, thereby reducing the inner diameter of the bushing cloth, and accordingly the clearance with the center pin is small. Therefore, the rotating component is difficult to rotate, and in an extreme case, noise is generated when the rotating component rotates. On the other hand, when the humidity is low, the bushing cloth contracts due to moisture release, thereby increasing the clearance with the center pin. As a result, the rotating parts are shaken, and the rotation becomes unstable. As described above, the rotation resistance of the center pin fluctuates due to the influence of wet and dry, so that the stable operation of the rotating parts cannot be obtained, and as a result, the proper operation of the piano cannot be secured and the touch of the key The weight becomes unstable.

  As a conventional support component for a rotating component for solving such a problem, for example, one disclosed in Patent Document 1 is known. In this patent document 1, the wippen frenzy is made of a fluorine resin. A pin hole is formed in a pair of arms of the Wippen Frange, and a center pin fixed to the Wippen is engaged with this pin hole, so that the Wippen can be rotated freely to the Wippen Frenzy. It is supported. However, in this Wippen Frenzy, the center pin is passed directly through the pin hole, and because the Wippen Frenzy is made of fluorinated resin, it has high hardness and does not have cushioning properties. Therefore, the rotation resistance of the center pin tends to vary, and its initial setting is very difficult. Further, since the center pin is directly passed through the pin hole, when the whippen is rotated, a radial force perpendicular to the axial direction is directly applied to the inner peripheral surface of the pin hole from the center pin. Works. For this reason, plastic deformation and wear are likely to occur on the inner peripheral surface of the pin hole, thereby causing whippen shaft wobbling and rattling, and in extreme cases, noise is generated.

  The present invention has been made to solve the above-described problems, can easily perform the initial setting of the rotation resistance of the pin, can prevent plastic deformation and wear of the bearing, It is an object of the present invention to provide a support mechanism for a rotating component of a keyboard instrument that can ensure a stable operation of the rotating component, thereby ensuring an appropriate operation of the keyboard instrument.

Shokai 60-41992

  A support mechanism for a pivoting part of a keyboard instrument that supports a pivoting part that pivots when the key is pressed, and includes a support part for supporting the pivoting part, and one of the pivoting part and the supporting part is provided. A bearing having a pin hole formed therein, a cylindrical main body portion made of an elastic material, and fibers planted on the inner peripheral surface of the main body portion, fixed to the pin hole, and a rotating part And a pin provided on the other of the support parts and rotatably engaged with the bearing while in contact with the fiber.

  According to the support mechanism for the rotating component of the keyboard instrument, when the key is depressed, the rotating component is fixed to the supporting component via the pin and the bearing fixed to the pin hole and engaged with the pin. Rotate. This bearing has a cylindrical main body portion and fibers implanted on the inner peripheral surface thereof, and the pin is rotatably engaged with the bearing while being in contact with the fibers. Since this fiber is flocked to the inner peripheral surface of the main body portion and extends toward the center side, the cushioning property is higher than when the fibers are attached along the inner peripheral surface by adhesion or the like. Since such highly cushioning fibers are interposed between the pins and the inner peripheral surface of the main body, even if the inner diameter of the main body varies somewhat, the fibers themselves inherently have cushioning and flocking. Due to the cushioning property, the rotation resistance of the pin is maintained almost constant, so that the initial setting of the rotation resistance can be easily performed.

  Further, when the rotating component rotates, the radial force acting on the bearing from the pin acts on the inner peripheral surface of the main body through the highly cushioning fiber, and does not act directly on the main body. Further, since the main body is made of an elastic material, the radial force acting on the main body is absorbed by the main body itself. Therefore, the plastic deformation and wear of the main body due to the radial force can be prevented, thereby preventing the shaft swing and rattling of the rotating parts. Further, in this bearing, since the fiber is used only in the portion that contacts the pin, the amount of fiber is smaller and the amount of expansion and contraction of the fiber due to changes in humidity is much smaller than when the entire bearing is made of fiber. . For this reason, even if the humidity changes, the clearance between the pin and the bearing is maintained almost constant, so that the pin rotation resistance hardly fluctuates. As described above, it is possible to ensure stable rotation of the rotating component while preventing shaft rotation and rattling of the rotating component and generation of noise caused by the shaft regardless of radial force or dryness. As a result, an appropriate operation of the keyboard instrument can be ensured and the key touch weight can be stabilized.

  According to a second aspect of the present invention, in the support mechanism for a rotating component of a keyboard instrument according to the first aspect, the main body of the bearing is made of an elastomer.

  The elastomer hardly expands due to moisture absorption or shrinks due to moisture release. Therefore, according to this structure, the fluctuation | variation of the rotation resistance of the pin according to the change of humidity can further be suppressed, and, thereby, the effect mentioned above by Claim 1 can be acquired more effectively.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a keyboard device of a grand piano including a support mechanism for rotating parts according to a first embodiment of the present invention in a key release state. As shown in the figure, the keyboard device 1 includes brackets 2 and 2 (only one of them is shown) erected at the end in the left-right direction (depth direction in the figure) of a casket (not shown), and the left-right direction. , A whippen rail 3 and a hammer shank rail 4 connected to brackets 2 and 2 at both ends, a plurality of swingable keys 5 (only one shown), and an action provided on the whippen rail 3 6 and a plurality of hammers 7 (only one is shown) provided for each key 5 on the hammer shank rail 4.

  The key 5 is swingably supported by a balance pin (not shown) erected on the bag, and a capstan 5a is screwed into the front side of the wippen rail 3 on the upper surface of the rear part (left part of the figure). It is.

  The action 6 includes a wippen 12, a jack 13 and a repetition lever 14 as rotating parts. The whippen 12 is rotatably supported by the whippen flange 11 screwed to the whippen rail 3 as a supporting component. The jack 13 and the repetition lever 14 are rotatably supported by the wippen 12 as a supporting component.

  As shown in FIG. 2, left and right mounting portions 11a and 11a branched in a bifurcated manner are provided on the upper portion of the Wippen frenzy 11, and each mounting portion 11a has a pin hole 11b penetrating in the left-right direction. Is formed. In each pin hole 11b, a bearing 15 is fitted and fixed by, for example, adhesion.

  As shown in FIGS. 3 and 4, the bearing 15 includes a cylindrical main body portion 16 having a through hole 16 a and a large number of fibers 17 planted on the inner peripheral surface of the main body portion 16. The main body portion 16 is formed of an elastomer molded product made of an elastic material such as urethane rubber or silicon rubber, and has a thickness T of, for example, 1 mm. The fibers 17 are made of chemical fibers (for example, nylon) having appropriate softness, and are implanted by, for example, electrostatic flocking over the entire inner peripheral surface of the main body portion 16, toward the center side of the main body portion 16. It extends. Further, the thickness of each fiber 17 is, for example, 0.03 mm, and the length L is, for example, 1 mm.

  As shown in FIG. 2, the wippen 12 includes a main body portion 18 extending in the front-rear direction, a lever flange portion 19 extending upward from the center portion thereof, a heel portion 20 protruding downward from the center portion, and the like. It is placed on the capstan 5a of the key 5 via the heel part 20 (see FIG. 1). A hole 21 penetrating in the left-right direction is formed at the rear end of the main body 18. The rear end portion of the main body portion 18 is engaged between the attachment portions 11 a and 11 a of the whippen frenzy 11, and a center pin 22 (pin) is inserted into each bearing 15 and the hole 21. The center pin 22 is fixed to the hole 21 of the whippen 12 and is rotatably engaged with the bearing 15 in a state in which both end portions are in contact with the fibers 17 of the bearings 15 of the whippen frenzy 11. Accordingly, the wippen 12 is rotatably supported by the wippen frenzy 11.

  In addition, left and right jack mounting portions 18a and 18a branched in a bifurcated shape are provided at the front end of the main body portion 18 of the wippen 12, and left and right lever mounting portions 19a and 18b branched in a bifurcated shape are provided in the upper portion of the lever flange portion 19. 19a are provided, and each jack mounting portion 18a and each lever mounting portion 19a are formed with a pin hole 18b and a pin hole 19b penetrating in the left-right direction. The above-described bearing 15 is also fitted into these pin holes 18b and 19b and fixed by, for example, adhesion.

  The repetition lever 14 extends in the front-rear direction, and has a hole 23 penetrating in the left-right direction at the center and a jack guide hole 24 penetrating in the up-down direction at the front end. The central portion of the repetition lever 14 is engaged between the lever mounting portions 19 a and 19 a of the wippen 12, and a center pin 22 is inserted into each bearing 15 and the hole 23. The center pin 22 is fixed to the hole 23 of the repetition lever 14 and is rotatably engaged with the bearing 15 in a state where both end portions are in contact with the fiber 17 of the bearing 15 of each lever mounting portion 19a. . Thus, the repetition lever 14 is rotatably supported by the wippen 12. Further, a repetition screw 25 penetrating in the vertical direction is screwed into the rear end portion of the repetition lever 14, and a repetition button 26 is attached to the lower end portion thereof.

  The jack 13 is formed in an L shape by a base portion 13a, a hammer push-up portion 13b extending upward from the base portion 13a, and a regulating button contact portion 13c extending forward from the base portion 13a. A hole 27 penetrating in the left-right direction is formed in the base portion 13a. The base portion 13 a is engaged between the jack mounting portions 18 a and 18 a of the wippen 12, and the center pin 22 is inserted into each bearing 15 and the hole 27. The center pin 22 is fixed to the hole 27 of the jack 13 and is rotatably engaged with the bearing 15 in a state where both end portions are in contact with the fiber 17 of the bearing 15 of each jack mounting portion 18a. Thereby, the jack 13 is rotatably supported by the wippen 12. Further, the hammer push-up portion 13b is engaged with the jack guide hole 24 of the repetition lever 14 at the tip portion, and a jack button screw 28 penetrating in the front-rear direction is screwed into the middle portion in the vertical direction. A jack button 29 is attached to the end. Further, on the upper surface of the main body portion 18 of the whippen 12, a spoon 31 with which the jack button 29 abuts immediately behind the jack 13 is provided.

  A repetition spring 32 that urges the jack 13 and the repetition lever 14 counterclockwise in the same figure is attached to an intermediate portion in the vertical direction of the lever flange portion 19 of the whippen 12. Due to the urging of the repetition spring 32, the repetition button 26 of the repetition lever 14 contacts the upper surface of the main body 18 of the wippen 12 and the jack button 29 of the jack 13 contacts the spoon 31 in the key release state shown in FIG. It touches.

  As shown in FIG. 5, the hammer 7 is composed of a hammer shank 8 extending in the front-rear direction and a hammer head 9 provided integrally at the rear end portion. A shank roller 36 is provided at the front end portion of the lower surface of the hammer shank 8, and left and right hammer shank flange mounting portions 7a, 7a branched in a bifurcated manner are provided at the front side thereof. Each hammer shank flange mounting portion 7a is formed with a pin hole 7b penetrating in the left-right direction, and the above-described bearing 15 is fitted into each pin hole 7b and fixed by, for example, bonding. On the other hand, a hammer shank flange 33 is screwed to the hammer shank rail 4 for each key 5 (see FIG. 1). At the rear end portion of the hammer shank flange 33, a hole 34 penetrating in the left-right direction is formed. The center pin 22 is inserted into each bearing 15 and the hole 34 with the hammer shank flange mounting portions 7a and 7a engaged with the rear end portion of the hammer shank flange 33. The center pin 22 is fixed to the hole 34 of the hammer shank flange 33 and is rotatably engaged with the bearing 15 in a state where both ends thereof are in contact with the fibers 17 of the bearing 15 of each hammer shank flange mounting portion 7a. is doing. Thereby, the hammer 7 as a rotating part is supported by the hammer shank flange 33 as a supporting part so as to be rotatable.

  The shank roller 36 is placed on the edge of the jack guide hole 24 of the repetition lever 14 in the key release state (see FIG. 1). In front of the hole 34 of the hammer shank flange 33, a drop screw 35 is screwed from below. In addition, a regulating button 38 is provided for each key 5 on the lower surface of the hammer shank rail 4 via a regulating rail 37.

  With the above configuration, when the key 5 is depressed, the capstan 5a pushes up the heel portion 20 so that the wippen 12 rotates counterclockwise around the rear end portion. And the repetition lever 14 also moves upward together. Along with these movements, the repetition lever 14 first pushes up the hammer 7 via the shank roller 36 and rotates it upward. Next, the front end portion of the repetition lever 14 abuts on the drop screw 35, and the repetition lever 14 rotates clockwise around the upper end portion of the lever flange portion 19, whereby the hammer push-up portion 13 b of the jack 13 is moved to the shank roller 36. The hammer 7 is pushed up through. Thereafter, when the hammer 7 rotates until just before striking the string S stretched upward, the regulating button abutting portion 13 c abuts on the regulating button 38, so that the jack 13 is connected to the main body portion 18. Rotating clockwise around the front end, the contact with the shank roller 36 is released. As a result, the hammer 7 is disconnected from the action 6 and the key 5 and hits the string S in a freely rotating state.

  When the key 5 is released, the hammer 7 and the whippen 12 rotate by their own weight, and the jack 13 and the repetition lever 14 are urged by the repetition spring 32 to rotate in the opposite direction to the key depression, respectively. Thus, the key release state shown in FIG. 1 is restored.

  As described above, the whippen 12, the jack 13, the repetition lever 14 and the hammer 7 as rotating parts are supported by the whippen flange 11 and the whippen 12 (jack mounting) via the center pin 22 and the bearing 15. The part 18a, the lever mounting part 19a), and the hammer shank flange 33 are rotatably supported, respectively, and rotate when the key 5 is pressed and released. In the present embodiment, a large number of fibers 17 are implanted on the inner peripheral surface of the main body portion 16 of these bearings 15 and extend toward the center. Therefore, even when the inner diameter of the main body portion 16 varies somewhat, the rotational resistance of the center pin 22 is maintained substantially constant due to the high cushioning property of the fibers 17 interposed between the center pin 22 and the main body portion 16. The initial setting of the rotation resistance can be easily performed.

  Further, when the rotating component rotates, the radial force acting on the bearing 15 from the center pin 22 acts on the inner peripheral surface of the main body portion 16 via the fiber 17 having a high cushioning property. Does not work directly. Further, the radial force acting on the main body portion 16 is absorbed by the main body portion 16 itself due to the elasticity of the elastomer. Therefore, it is possible to prevent plastic deformation and wear of the main body portion 16 due to radial force, and thereby prevent the rotational parts from shaking and rattling.

  Further, in this bearing 15, the fibers 17 are used only in the portions that come into contact with the center pin 22, so that the amount of fibers is smaller than the case where the entire bearing is composed of fibers, and the expansion and contraction of the fibers 17 due to changes in humidity The amount is very small. Further, the elastomer hardly expands due to moisture absorption or shrinks due to moisture release. Therefore, even if the humidity changes, the clearance between the center pin 22 and the bearing 15 is maintained almost constant, so that the rotation resistance of the center pin 22 hardly varies. As described above, it is possible to ensure stable rotation of the rotating component while preventing shaft rotation and rattling of the rotating component and generation of noise caused by the shaft regardless of radial force or dryness. As a result, the proper operation of the grand piano can be secured and the touch weight of the key 5 can be stabilized.

  FIG. 6 shows a bearing according to a second embodiment of the present invention and a manufacturing method thereof. Like the bearing 15 of the first embodiment, the bearing 41 is composed of a cylindrical main body 42 made of an elastomer or the like, and fibers 17 planted on the inner peripheral surface thereof, and the manufacturing method thereof is different. Yes, it is produced as follows. As shown in FIG. 1A, first, a large number of fibers 17 are implanted by electrostatic flocking on one surface of a sheet-like main body portion 42 made of an elastomer. Next, the main body portion 42 is rounded into a cylindrical shape with the surface where the fibers 17 are implanted inside, and the end surfaces are bonded to each other, thereby completing the bearing 41 shown in FIG.

  According to this manufacturing method, since the flocking is performed in a state where the main body portion 42 is spread in a sheet shape, the fibers are more than the first embodiment in which the fibers 17 are flocked on the inner peripheral surface of the main body portion 16 formed into a cylindrical shape. 17 can be easily implanted.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, the embodiment is an example in which the present invention is applied to the whippen 12, the jack 13, the repetition lever 14, and the hammer 7 of the grand piano, but the present invention is applied to other rotating parts that rotate in accordance with the key depression. May be. For example, in general, a grand piano is supported by a damper flange, and a damper lever that rotates by being pushed up at the rear end of the key when the key is pressed, or a damper that is supported by the damper lever and rotates with the rotation. Since the wire flange is provided, the present invention may be applied using these damper levers and damper wire flanges as rotating parts.

  In the present embodiment, the main body 16 of the bearing 15 is made of an elastomer, but may be made of another elastic material such as general rubber. Moreover, although the chemical fiber is used as the fiber 17, a natural fiber may be used, for example, a wool fiber may be used. In the present invention, since the fibers 17 are used only in the portion that contacts the center pin 22, even if wool fibers that are easily expanded and contracted by dry and wet are used, the amount of expansion and contraction is small. be able to. In the embodiment, electrostatic flocking is used as a method for flocking the fibers 17. However, the method is not limited to this, and a mechanical flocking method may be used, for example.

  The embodiment is an example of an acoustic type grand piano, but the present invention can be applied to an upright piano and other types of keyboard instruments such as an organ, an electronic piano, an electronic organ, and the like. Is possible. In addition, the detailed configuration can be changed as appropriate within the scope of the gist of the present invention.

It is side sectional drawing which shows the keyboard apparatus containing the support mechanism of the rotation components of this invention in a key release state. It is a disassembled perspective view which shows an action. It is a front view of the bearing of a support mechanism. It is a side view of a bearing. It is a perspective view which shows a hammer. It is a perspective view which shows the preparation methods of the bearing of 2nd Embodiment before (a) preparation and after (b) preparation.

Explanation of symbols

7 Hammer (Rotating parts)
7b Pin hole 11 Whippen frenzy (support parts)
11b Pin hole 12 Whippen (turning parts, support parts)
13 Jack (Rotating parts)
14 Repetition lever (turning part)
15 Bearing 16 Body 17 Fiber 18b Pin hole 19b Pin hole 22 Center pin (pin)
33 Hammer Shank Frenzy (support parts)
41 Bearing 42 Body

Claims (2)

A support mechanism for a rotating component of a keyboard instrument that supports a rotating component that rotates with a key press,
A support component for supporting the rotating component;
A pin hole is formed in one of the rotating part and the supporting part,
A cylindrical main body portion made of an elastic material, and fibers planted on the inner peripheral surface of the main body portion, and a bearing fixed to the pin hole,
A pin that is provided on the other of the rotating component and the supporting component and that is rotatably engaged with the bearing in contact with the fiber;
A support mechanism for a rotating part of a keyboard instrument, further comprising: The support mechanism for a rotating component of a keyboard instrument according to claim 1, wherein the main body portion of the bearing is made of an elastomer.

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