JP2004252252A - Action of grand type piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an action of a grand piano in which touch weight is reduced and responsiveness is improved by reducing the weight of the entire action and production cost is also reduced by reducing the number of parts and the number of assembling processes and improving assembly precision. <P>SOLUTION: In an action 1 of a grand piano, a hammer 10 is rotated by the operation related to the touching of a key 2. The action 1 is provided with wippen 3 which is constituted of a synthetic resin molding part and rotates upward by the pushing up action of the key 2 being touched, a jack 5 which is mounted onto the wippen 3 in a freely rotative manner and pushes up the hammer 10 by the rotation of the wippen 3 and a spoon 3a which is integrally formed with the wippen 3, upwardly extended from the wippen 3 and determines the angular position of the jack 5 while the key 2 is not touched. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
The present invention relates to an action of a grand piano which rotates a hammer by operating in response to a key depression.
TECHNICAL FIELD OF THE INVENTION
[0002]
[Prior art]
FIG. 3 shows the action of a conventional general grand piano. The action 51 includes a rotatable wippen 53 mounted on the rear part of the key 2, a repetition lever 4 and a jack 5 rotatably mounted on the wippen 53, and a reversing direction between the whippen 53 and the reversing lever 5. And a repetition spring 6 that urges in a counterclockwise direction. Further, it has a drop screw 7 and a regulating button 8 for restricting the movement of the repetition lever 4 and the jack 5, respectively. Further, a hammer 10 is mounted on a front portion of the repetition lever 4 via a shank roller 9. The wippen 53 is made of wood or a synthetic resin. In the case of a synthetic resin, its weight is 10 to 12 g.
[0003]
A jack button screw 11 is screwed to the jack 5 so as to be able to advance and retreat in a state penetrating in the front-rear direction, and a jack button 12 is integrally attached to a rear end thereof. In addition, a hole (not shown) is formed in advance on the upper surface of the wippen 53, and the spoon 63 is erected on the upper surface of the wippen 53 by press-fitting the spoon 63 into this hole. The spoon 63 is made of a metal such as iron or brass, weighs 0.8 to 0.9 g, and is in contact with the jack button 12 in the key release state. Therefore, by turning the jack button screw 11, it is possible to adjust the angular position of the jack 5 in the key release state.
[0004]
When the key 2 is depressed from the key release state, the whippen 53 is pushed up, and the repetition lever 4 and the jack 5 rotate upward together with the whippen 53. Then, the turned jack 5 pushes up the hammer 10 via the shank roller 9 so that the hammer 10 strikes the string S.
[0005]
Further, as an action whippen of an upright piano, for example, the one described in Patent Document 1 is known. This wippen is made of aluminum material, and is formed by integrally pressing a damper spoon, a back check, a back check wire and a bridle wire, and omits members such as a center pin and a spring. A touch feeling and an operation state can be obtained.
[0006]
[Patent Document 1]
Microfilm of FIG. 50 (Japanese Utility Model Application No. 50-60369) (FIG. 3, page 4 to page 5, line 3)
[0007]
[Problems to be solved by the invention]
However, in the above-described action 51 of the grand piano, the spoon 63 attached to the wippen 53 is made of a heavy metal such as iron or brass. The touch weight is also increased accordingly. Therefore, when a light touch is required, it may be necessary to attach a key weight for reducing the touch weight to the front of the key 2. In addition, as the weight of the entire action 51 increases, the action of the action 51 when the key 2 is depressed also becomes slow, and the responsiveness decreases. Further, since the spoon 63 is attached to the hole of the wippen 53 by press-fitting, the number of parts and the number of assembling steps are increased, and the manufacturing cost is correspondingly increased. Further, for the same reason, the mounting angle of the spoon 63 with respect to the wippen 53 tends to vary, and the assembling accuracy is reduced. For this reason, it takes time and effort to adjust the angle position of the jack 5 by the jack button screw 11, which further increases the manufacturing cost.
[0008]
The present invention has been made in order to solve such a problem. By reducing the weight of the entire action, the touch weight can be reduced and the responsiveness can be improved. An object of the present invention is to provide a grand piano action that can reduce manufacturing costs by reducing man-hours and improving assembly accuracy.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the present invention is an action of a grand piano in which a hammer is rotated by actuating in response to a key being pressed. A whippen that pivots upward by being pushed up with the key, and is rotatably attached to the whippen, and with the rotation of the wippen, a jack that pushes up the hammer and pivots upward, and is integrally formed with the wippen, A spoon extending upward from the wippen and determining an angular position of the jack in a key released state.
[0010]
According to this configuration, the spoon is integrally formed with the wippen made of a synthetic resin molded product, so that the weight is smaller than that of the conventional spoon made of metal, thereby reducing the overall action. Weight is reduced. As a result, the touch weight can be reduced and the responsiveness can be improved. Further, while the spoon is conventionally a separate part from the wippen, in the present invention, the spoon is integrally formed with the wippen, so that the number of parts and the number of assembling steps can be reduced accordingly. Further, since the spoon is formed integrally with the wippen, there is almost no variation in the angle of the spoon with respect to the whippen, and the assembling accuracy when the jack is attached is improved. As a result, the adjustment of the angular position of the jack is facilitated, and thus the manufacturing cost can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows action 1 of a grand piano according to an embodiment of the present invention. In the following description, among the components of the action 1, those having the same configuration as the conventional action 51 shown in FIG. 3 are denoted by the same reference numerals.
[0012]
As shown in FIG. 1, the action 1 of the grand piano is arranged behind a fulcrum (not shown) of a key 2 extending in the front-rear direction and above the key 2, and rotates around a rear end. It comprises a movable wippen 3, a repetition lever 4 and a jack 5 rotatably attached to the wippen 3, and a repetition spring 6 for urging the both 4, 5 in a return direction (counterclockwise direction in the figure). ing. Further, it has a drop screw 7 and a regulating button 8 for restricting the movement of the repetition lever 4 and the jack 5, respectively.
[0013]
The action 1 is attached to brackets 14 (only one is shown in FIG. 1) provided at left and right ends of a reed (not shown) on which the key 2 is placed. A wippen rail 15 is passed between the left and right brackets 14, 14. A rear end of the wippen 3 is rotatably attached to each wippen flange 16 screwed to the wippen rail 15. I have.
[0014]
The wippen 3 is made of a synthetic resin molded article having excellent impact resistance such as ABS. The wippen 3 has a rectangular cross section, extends in the front-rear direction, has a whippen heel 17 projecting downward at the center thereof, and a capstan screw 18 provided at the rear end of the upper surface of the key 2. It is placed via a wippen heel 17. As shown in FIG. 2, a spoon 3a for determining the angular position of the jack 5 is integrally formed with the wippen 3 at a predetermined position in the front part of the wippen 3 so as to extend upward. The jack button 12 is in contact with the upper end of the front surface of the spoon 3a in the key release state. The spoon 3a has an elongated triangular side shape. The contact position with the jack button 12 is set to be the same as that of the conventional spoon 63 shown in FIG. 3, so that the angle of the jack 5 in the key release state is the same as that of the conventional spoon. The weight of the spoon 3a is, for example, 0.3 to 0.5 g, which is smaller than that of the conventional spoon 63 (0.8 to 0.9 g).
[0015]
The repetition lever 4 extends obliquely upward and forward in the front-rear direction, and is rotatably attached to the wippen 3 at the center thereof. At a predetermined position in the front part of the repetition lever 4, a jack guide hole 4a penetrating in the vertical direction is formed so as to extend in the front-rear direction.
[0016]
The jack 5 is formed in an L-shape from a hammer protrusion 5a extending vertically and a regulating button contact portion 5b extending substantially perpendicularly forward from the lower end thereof. It is movably mounted. The upper end of the hammer protrusion 5a engages with the jack guide hole 4a of the repetition lever 4 movably in the front-rear direction, and faces the shank roller 9 with a small gap in the key release state. I have.
[0017]
In addition, a jack button screw 11 for adjusting the angular position of the jack 5 is screwed into the middle part of the hammer protrusion 5a of the jack 5 so as to be able to move forward and backward while penetrating in the front-rear direction. A jack button 12 is provided integrally with the tip of the jack button screw 11, and the jack button 12 is in contact with the spoon 3a in the key release state. Therefore, by turning the jack button screw 11, it is possible to adjust the angular position of the jack 5 in the key release state.
[0018]
On the other hand, the hammer 10 is composed of a hammer shank 19 extending in the front-rear direction and a hammer head 20 attached to the tip of the hammer shank 19. At the base end of the hammer shank 19, a hammer shank flange 22 screwed to a hammer shank rail 21. It is attached rotatably to. The shank roller 9 is, for example, formed in a cylindrical shape from an inner cloth and a skin wound around the outer cloth, and is attached to a predetermined position on the lower front part of the hammer shank 19. The shank roller 9 is placed near the jack guide hole 4a on the upper surface of the repetition lever 4 so as to straddle it. On the lower surface of the hammer shank flange 22, a drop screw 7 for regulating the upward rotation of the repetition lever 4 is screwed forward and backward freely, and a predetermined end portion of the repetition lever 4 to which the lever skin 23 is attached is provided. They face each other at intervals.
[0019]
A regulating rail 24 is screwed to the lower surface of the hammer shank rail 21, and a regulating button 8 for restricting upward rotation of the jack 5 is screwed to the lower surface of the regulating rail 24 so as to be able to advance and retreat. And faces the front end of the regulating button contact portion 5b of the jack 5 at a predetermined interval.
[0020]
Next, the operation of Action 1 having the above configuration will be described with reference to FIG. When the key 2 is depressed from the key release state shown in FIG. 1, the whippen 3 rotates by being pushed up, and the repetition lever 4 and the jack 5 move upward together with the whippen 3. Along with these movements, first, the repetition lever 4 pushes up the hammer 10 via the shank roller 9 while sliding the shank roller 9 to rotate it upward. Next, the rotation of the repetition lever 4 is engaged with the drop screw 7 to prevent the rotation of the drop screw 7, so that the jack 5 pushes up the hammer 10 via the shank roller 9. Thereafter, when the hammer 10 is rotated until immediately before striking the string S stretched upward, the jack 5 is engaged with the regulating button 8 and its rotation is prevented, so that the shank roller is rotated. Exit from 9. As a result, the hammer 10 is disconnected from the action 1 and the key 2, and strikes the string S in a freely rotating state.
[0021]
Further, at the timing when the key 2 is released after the string is hit and the key 2 is returned to a certain extent, the repetition lever 4 starts to move and returns to the counterclockwise direction by the spring force of the repetition spring 6, thereby rotating the shank roller 9. Push up while sliding. As a result, the jack 5 returns and rotates counterclockwise due to the spring force of the repetition spring 6, and returns to the key release state when the jack button 12 comes into contact with the spoon 3a.
[0022]
As described above, according to the present embodiment, since the spoon 3a is integrally formed with the wippen 3 formed of a synthetic resin molded product, the weight of the spoon 3a is smaller than that of the conventional spoon 63 formed of metal. Is reduced, thereby reducing the weight of the entire action 1. As a result, the touch weight can be reduced and the responsiveness can be improved. Further, while the spoon 63 is conventionally a separate part from the wippen 53, the spoon 3a is integrally formed with the wippen 3, so that the number of parts and the number of assembling steps can be reduced accordingly. Furthermore, since the spoon 3a is formed integrally with the wippen 3, the angle of the spoon 3a with respect to the whippen 3 is substantially uniform, and the assembling accuracy when the jack 5 is attached is improved. As a result, the angular position of the jack 5 can be easily adjusted, and the manufacturing cost can be reduced.
[0023]
Note that the present invention can be implemented in various forms without being limited to the embodiments described above. For example, in the above-described embodiment, the present invention is applied to an acoustic grand piano, but may be applied to a grand electronic piano instead. In addition, details can be appropriately changed within the scope of the present invention.
[0024]
【The invention's effect】
As described in detail above, the action of the grand piano of the present invention can reduce the touch weight and improve the responsiveness by reducing the weight of the entire action, and can reduce the number of parts and the number of assembly steps. The reduction and the improvement of the assembly accuracy have an effect that the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a keyboard device including an action of a grand piano to which an embodiment of the present invention is applied.
FIG. 2 is a perspective view of the wippen of FIG. 1;
FIG. 3 is a side view of a keyboard device including actions of a conventional grand piano.
FIG. 4 is a perspective view of the wippen of FIG. 3;
[Explanation of symbols]
1 action 2 key 3 wippen 3a spoon 5 jack 10 hammer

Claims (1)

An action of a grand type piano that rotates a hammer by operating in response to a key being pressed,
A wippen that is made of a synthetic resin molded product and is turned upward by being pushed up by the pressed key;
A jack that is rotatably attached to the wippen, pushes up the hammer and rotates upward with the rotation of the whippen,
A spoon integrally formed with the whippen, extending upward from the whippen, and determining an angular position of the jack in a key released state;
The action of a grand piano characterized by having a.

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