JPH03269576A - Muffler device for grand piano - Google Patents

Abstract

PURPOSE:To prevent a buffer member from bending when it is turned and erected and to improve muffling effect without cutting the front edge part of a damper felt by disposing the buffer member in front of a hammer and turning backward by a muffler arm and interposing the buffer member between a chord and the hammer. CONSTITUTION:When an operation lever 23 is operated, the muffler arm 19 is turned backward by a wire 22 connected to the lever 23 and the buffer member 20 approaches to the chord (g). Simultaneously, a lifting guide 26 is pulled forward and moved by the other wire 28 connected to the lever 23, and a roller 25 on the bottom surface of the lifting rail 13 rides on a projecting line 26a on the lifting guide 26. Then, the lifting rail 13 is turned upward and separates the damper 16 from the chord (g), and the buffer member 20 is almost horizontally positioned on the bottom side of the chord (g) therebetween. Thus, without cutting the front edge part of the damper felt, the buffer member is prevented from bending when it is turned and erected. Thus, the muffling effect can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a muffler device for performing soft tones in a grand piano.

(Prior art) Recently, in grand pianos, a buffer member is interposed between the hammer and the strings in the same way as in applied pianos.
I try to play in a soft tone, but up until now,
The damping member is rolled up from a vertical position to a horizontal position in a narrow space between the hammer and the damper guide behind it (for example, Japanese Patent Application Laid-Open No. 60-24109
4), it may not be possible to install it depending on the model.
Since the length of the buffer member that can be interposed between the string and the hammer is not sufficient, and the expected dampening effect cannot be obtained, the applicant decided to install a buffer member in front of the hammer h as shown in Fig. 7. A muffler rail a is arranged in the width direction (perpendicular to the plane of the paper) and is supported rotatably in the front and back direction by muffler arms b pivoted on both sides of the piano body, and a plurality of thin A cushioning member C such as felt of a constant width is stretched in an arc shape through a support rod e, while a wire W fixed at a suitable position on a muffler arm b or muffler rail a is provided on the lower surface of a shelf G. A device was proposed in Japanese Patent Application No. 1-240867 which is connected to a lever 1, and when the lever 1 is operated, a buffer member C is rotated forward to be interposed between a string g and a hammer h.

(Problem to be Solved by the Invention) In the above device, since the buffer member C is placed in a relatively wide space in front of the hammer h, the width of the buffer member C in the front and back direction is increased to ensure that the string g and hammer The damper felt da, which is generally attached to the damper d on the string g, has the advantage of being able to be sufficiently interposed between the strings g and the damper felt. However, in the bass and middle range areas that require reliable sound-stopping action, as shown in Figure 8 A, for one string (bass part), the lower end of the felt da should be bifurcated and the string sandwich g, 2
For the main string (middle part), make the felt da into a V-shape as shown in the figure, and for the third string (middle part), make it into a W-shape as shown in the figure C. The tip of the damper felt da protrudes below the string g as shown in FIG.

For this reason, if you try to improve the weak tone effect by moving the buffer member C as close as possible to the string g when standing up, the tip of the buffer member C will hit the front end of the damper fell (daO) and bend when you stand up. Buffer member C at the string striking position
may cease to exist. In this case, it is conceivable to cut the front end of the damper felt daO diagonally, but this increases the number of work steps and reduces the contact area between the damper felt da and the string g, reducing the sound stopping effect.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a muffler device that can prevent the damper felt from bending when it is rotated and raised without cutting the front end of the damper felt, thereby improving the damping effect. .

(Means and Effects for Solving the Problems) To achieve the above object, the present invention includes an action mechanism that has a hammer for hitting strings corresponding to a key, and a damper mechanism that has a damper for stopping sound at the rear of the action mechanism. A lifting rail that pushes up all the dampers as required is arranged on the back side of the key so that it can be rotated up and down, while a buffer member of a certain width is arranged in front of the hammer, and the buffer member is A grand piano supported by a muffler arm pivotally supported on both side plates of a piano body so as to be rotatable in the front and back direction, and the muffler arm is rotated rearward so that the above-mentioned buffer member is interposed between the strings and the hammer. As a muffler device, a roller is rotatably supported at a required location on the lower surface of the lift rail, and
Correspondingly, a guide board is provided on the shelf board of the piano body, and the guide board has a protrusion on the upper surface that raises and lowers the roller, so that a lifting guide that supports the roller can be slid. It is characterized in that it is disposed with a spring bias toward the rear, and a wire locked to the lifting guide is connected to an operating lever on the lower surface of the shelf board to which the wire for operating the buffer member is attached.

When the operating lever is operated, one wire connected to it rotates the muffler arm backwards, bringing the buffer member closer to the strings, and at the same time, the other wire connected to the lever causes the lifter to move forward. It is pulled and moves, and the roller on the lower surface of the lifting rail rides on the protrusion on the guide, and the lifting rail rotates upward, separating the damper from the string, and in the meantime, the buffer member is held almost horizontally. position it below the string.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, l is a shelf board of the main body of the piano, on which a square frame-shaped keyboard holder is arranged, and on this keyboard holder a predetermined number of keys 3 constituting the keyboard are placed. is rotatably assembled via a central balance rail 2a, and an action mechanism A is disposed on the multi-cone 3. As is well known, the action mechanism A consists of a wippen 4 whose rear end (in the figure, the right side is the front and the left side is the rear) is pivotally supported by the flange f on the center rail R5, and the center part is rotated by a post 4a at the center of the wippen. movably coupled repetition lever 5
It consists of an L-shaped jack 6 whose corner part is rotatably attached to the front end of the wig 4, a hammer shank 7 whose front end is pivoted to a flange ft on the shank rail R2, and a hammer 8 at the tip of the hammer shank 7. The capstan screw 3a on the key 3 is
The wippen 4 rotates upward via the wippen heel 4b, and with the rotation, the repetition lever
5 and jack 6 rise together, and as a result of this rise, the upper end of jack 6 pushes up hammer roller 7a, and in the process of rising, the front end of the horizontal piece of jack 6 comes into contact with regulating button 9, and turns clockwise. This causes the upper end to come off the roller 7a, while the hammer shank 7
is rapidly rotated upward by the thrust of the roller 7a, and the hammer 8 strikes the string g to prompt a predetermined sound.

On the other hand, a damper mechanism is provided at the rear of the action mechanism A, and the rear end of each mechanism rotates on a flange f on a damper rail R3 fixed to the lower front surface of the rear stile 10 of the piano body. a damper lever 14 which is freely pivoted and whose front end overlaps the rear end of the key 3;
A damper wire 15 stands up from the front end of the lever 14 and extends upward through the damper guide holder 12 provided on the front end of the soundboard 11, and a damper felt 16a is attached to the upper end of the damper wire 15 and is attached to the string g from above. When the damper lever 14 is rotated upward by pressing the key, the damper wire 15 is raised and the damper 16 is temporarily separated from the string name. , the sound is stimulated by the hammer 8 hitting the string, and immediately after that, the damper felt 16a is brought into contact with the string g to stop unnecessary sound.The damper mechanism is screwed onto the lower surface of the damper lever 14. Installed pilot screw 14a and damper rail R3
The rear end can be pivoted to the flange f4 (only one side is shown in Figures 1 and 2) attached to both ends of the Futengreha-17.
and a lift rail 13 that is mounted and supported on the lower surface of this lifting lever 17, and a pilot screw 1
4a is maintained on the lifting rail 13,
By operating a pedal (not shown), the lifting rail 3 is pushed up via the push-up rod, and all the dampers 16 are separated from the string g, so that the above-mentioned sound stopping operation is not performed, and the string g
It is designed to obtain natural decaying sound and continuous sound reverberation.

An angular muffler rail 18 is disposed in front of the parallel hammers 8, that is, at a position above the center of the hammer shank 7, and both ends of the muffler rail 18 are pivoted inside the side plates of the piano body so as to be rotatable in the front and back direction. The muffler arm 19 is supported by a muffler arm 19 of a required length and biased forward and downward by a spring 21, and a buffer member 20 of a constant width is mounted on the upper surface of the muffler rail 18 via a plurality of thin arc-shaped support rods 18a. A wire 22 attached to the lower end of the muffler arm 19 is connected to the side of an operating lever 23, one end of which is pivotally supported in a case 24 provided at the front of the lower surface of the shelf board 1. By operating the operating lever 23, the muffler arm 1
9 is rotated rearward, and the buffer member 20 is interposed below the string g as shown by the dotted line in FIG. 1 to perform a soft tone performance.

However, the above configuration is the same as that of the prior art.

By the way, in this invention, the key 3 is arranged in the lateral direction of the piano body on the rear side, and the lower surface of the foot rail 13 is provided with a key.
One or more rollers 25 are pivotally supported at the center or at both ends (FIG. 2 shows the case at both ends), and on the shelf l, corresponding to the pivotally supported position of the rollers 25, As shown in Fig. 5, the guide groove 27a has a convex shape in the front and back direction.
A guide board 27 of a required length is mounted on the guide board 27, which is shorter than the guide board 27, has a chevron-shaped protrusion 26a at the center of the upper surface, and has a locking part 26b for the wire 28 at the front end. In addition, a lifting guide 26 having a convex engagement piece 26c provided on the lower surface is placed with the convex engagement piece 26C slidably fitted into the guide groove 27a, The lifting guide 26 is always biased rearward by a spring 29 disposed between the rear end and the rear stile 10 as shown in FIG. The roller 25 on the lower surface of the lift rail 13 is located in front of the chevron-shaped protrusion 26a of the guide 26 in a position where it does not push up the lift rail 13.

Further, the other end of the wire 28, one end of which is attached to the locking part 26b at the front end of the lifting guide, is pivoted at one end in a case 24 provided at the lower front part of the shelf Fi1, as shown in FIG. The operating lever 23 is connected to a wire 22 for operating the muffler arm 20, and the lever 23 is connected to the case 2.
It protrudes forward through a stepped window hole 24a provided in the front wall of No. 4, and is normally placed on the right end side of the window hole 24a.

In FIG. 1, the buffer member 20 is the muffler arm 19.
The hammer 8 is held in front of the hammer 8 by the spring force of the spring 21 provided between the hammer 8 and the side plate, and normal performance is performed.

In such a normal performance state, if the operating lever 23 is rotated to the left in FIG.
2 pulls the muffler arm 19 and attaches the muffler rail 18
is rotated backward to move the buffer member 2o closer to the lower surface of the string g from the position shown by the chain line in FIG. 3 as shown by the solid line.

At this time, the other wire 28 pulls the lifting guide 26 against the force of the spring 29 and moves it forward along the guide groove 27a of the guide board 27. As it moves forward, the roller 25 on the lower surface of the lift template rail 13 rotates and rides on the chevron-shaped protrusion 26a at the center of the upper surface of the lifting guide 26.

Therefore, the lifting rail 13 is lifted, and the lifting causes the damper lever 14 to rotate upward via the pilot screw 14a, and then the damper 16 is pushed up via the damper wire 15, so that the damper fell (16a) move away from g.

Then, with the subsequent operation of the lever 23, the muffler arm 1
9, the tip of the buffer member 2o is positioned below the string g without abutting against the damper fell H6a.

In this way, when the tip of the buffer member 2o passes the tip of the damper felt 16a, the lift template rail 1
As shown in FIG. 4, the roller 25 on the lower surface descends from the chevron protrusion 26a as the lifting guide 26 moves forward and is positioned on the flat surface at the rear of the protrusion 26a, and the lifting rail 13 now rotates downward. It is in a horizontal state and the damper wire 15
The damper 16 is lowered through the damper felt 6a.
is brought into contact with string g.

Thus, in the bass and middle registers, the lower edge of the damper felt 16a protrudes below the string g as shown in the figure, but the damper member 2o is kept in a nearly horizontal state and is connected to the string g and the hammer. 8, the hammer 8 hits the string g via this buffer member 20, and the impact force is weakened to reduce the sound volume.

At this time, the operation lever 23 is moved to the window hole 24a of the case 24.
It is locked to the stepped part of.

In addition, in the above-mentioned state of playing a soft tone, if the operating lever 23 is removed from the step at the left end of the window hole 24 and returned to the right side, the muffler arm 19 is rotated forward by the restoring force of the spring 21, and the buffer member 20 is returned to its original position. Return to the position, and lift the lifting guide 2 again.
6 also slides backward on the guide board 27 by the restoring force of the spring 29 and returns to the initial position.

Note that the protrusion on the upper surface of the lifting guide 26 is not limited to a chevron shape, but may be in any other shape as long as the roller 25 on the lower surface of the lifting rail can be moved up and down smoothly.

(Effects of the Invention) As described above, the present invention provides a grand piano in which a buffer member is provided in front of the hammer, and the buffer member is rotated backward by the muffler arm to be interposed between the strings and the hammer. As a muffler device with the above-mentioned configuration, the damper can be reliably separated from the strings as the muffler arm rotates, and the collision between the damper felt and the buffer member can be prevented without cutting the front end of the damper felt. The damping member can be interposed approximately horizontally with a sufficient length between the string and the hammer without fear of the tip being bent, and the damping effect can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the invention. FIG. 2 is a partial perspective view showing the relationship between the damper mechanism and the buffer member. FIG. 3 is a side view of the damper mechanism showing the muffler arm in the middle of rotation. FIG. 4 is a side view of the damper mechanism showing the end of rotation of the muffler arm. FIG. 5 is a separated perspective view of the lifting guide and the guide board. FIG. 6 is a perspective view of a portion of the operating lever. FIG. 7 is a partially cutaway side view of the prior art. Figures 8A, 8A and 8B are front views showing the relationship between strings and damper felts in the bass and middle ranges, respectively. In the diagram, A...action mechanism, D...damper mechanism, 1...shelf board, 3...key, 8...hammer 10
... Back stile, 11 ... Sound board, 12 ... Damper guide holder 13 ... Lift template lever, 14 ... Damper lever 16 ... Damper 16
a... Damper felt, 17... Lift template lever 18... Muffler rail, 19... Muffler arm,

Claims (1)

[Claims] Equipped with an action mechanism that has a hammer for hitting strings corresponding to the key, and a damper mechanism that has a damper for damping sound at the rear of the action mechanism, and a lifting rail that pushes up all the dampers as required on the back of the key. While it is arranged so that it can rotate,
A buffer member of a certain width is arranged in front of the hammer, and the buffer member is supported by a muffler arm that is pivotally supported on both sides of the piano body so as to be rotatable in the front and back direction, and the muffler arm is rotated rearward. In a grand piano muffler device in which the above-mentioned buffer member is interposed between the strings and the hammer, a roller is rotatably supported at a required location on the lower surface of the above-mentioned lifting rail, and the piano A guide board is provided on the shelf board of the main body, and the guide board has a protrusion on its upper surface that raises and lowers the roller, so that a lifting guide that supports the roller is slidable and biased rearward by a spring. A muffler device for a grand piano, characterized in that the wire latched to the lifting guide is connected to an operating lever on the lower surface of the shelf board to which the wire for operating the buffer member is attached.