JPH0543119B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grand piano that effectively reduces the volume of the performance and enables soft-tone performance.

[Conventional technology]

Conventionally, in the case of grand pianos, the keys and the action mechanism are slid laterally along with the keyboard reed by pedal operation to reduce the number of strings struck by the hammers; for example, in the case of high-pitched strings, usually one hammer is used. 2 to hit the three strings with
The strings of the book are struck to reduce the sound volume and produce a softer tone. However, moving the key and the action mechanism requires a corresponding amount of movement space, and also requires a pedal and pedal lever mechanism, resulting in a complicated structure and an increased number of parts.

Therefore, a piano was proposed (Special Publication No. 22294 of 1983) in which, like the upright piano, a buffer member was selectively interposed between the strings and the hammer to weaken the impact force of the hammer.

[Problem that the invention seeks to solve]

However, due to the structure of such pianos, the shock absorbing member must be placed in front of the string striking position (on the player's side), and it occupies a large space, so the hammer is hidden during action adjustment.
It gets in the way of work. Furthermore, since the shock absorbing member must be horizontally arranged and slid back and forth, the shock absorbing member itself is required to have a certain degree of rigidity, which reduces the dampening effect. Moreover, since the buffer member is arranged horizontally, even if it has some rigidity, it is likely to deform over time. Furthermore, since the position is changed by moving horizontally, the drive mechanism is complicated, and there are many drawbacks, such as inconvenience as there is no function to hold or confirm when switching.

[Means for solving problems]

The grand piano according to the present invention has been made to solve the above-mentioned drawbacks, and includes a muffler rod, a buffer member, and an operating means, and the muffler rod is rotatably disposed below the strings. The buffer member extends in a direction transverse to the string, has a plurality of notches at predetermined intervals along the muffler rod, one end is fixed to the muffler rod and hangs down in an inactive state, and the operating means is attached to the muffler rod. is rotated to interpose the buffer member between the string and the hammer.

[Effect]

In this invention, since the buffer member is normally suspended, there is little change over time, excellent shape stability, and less rigidity is required.
Furthermore, the switching can be confirmed by emitting a sound during the switching operation.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a side sectional view of the action mechanism of a grand piano according to the invention, FIG. 2 is a perspective view of the muffler device, and FIG. 3 is a side view of the sounding mechanism. In Figure 1, 1 is a shelf board with a keyboard reed 2 on its top.
However, a key 3 is further placed above it.

The keyboard reed 2 has a front reed 2A, a middle reed 2B, and a rear reed 2.
C, consists of a keyboard reed center pin 2D etc. that connects these, and an oval key pin 4 for regulating and preventing the left and right rotation of the key 3 in the front 2A of the reed, and a keyboard center 2B
A balance key pin 5 that supports the middle part of the key 3 so as to be rotatable in the vertical direction is installed in each of the keys.

A conventionally known action mechanism 6 is disposed above the rear end of the key 3 in correspondence with the string 7. The action mechanism 6 has one end rotatably supported on the support rail 8 via a flange 9, and the wippen 11 is pushed up and rotated by the capstan 10 when the key 3 is pressed. A jack 12 is rotatably supported at one end, a repetition lever 14 is rotatably disposed above the wippen 11 via a flange 13, and one end is rotatably connected to a shaft rail 15 via a flange 16. A hammer shank 20 is movably supported and has a hammer felt 18 fixed to its tip via a hammer wood 17 to constitute a hammer, and is normally placed on the repetition lever 14 via a hammer roller 19. , a repetition lever spring 21 that gives the jack 12 and the repetition lever 14 a return habit. The jack 12 rises together with the repetition lever 14 to push up the hammer roller 19, and on the way, it contacts the regulation retouching button 22 and is rotated clockwise, thereby pushing up the hammer roller 19. It is configured to temporarily escape from the bottom of 19. The hammer shank 20 is rotated upward by the thrusting action of the hammer roller 19 by the jack 12, so that the hammer felt 18 strikes the string 7 and produces sound.

The support rail 8 and the shunt rail 15 are fixed to a bracket 24 erected on the keyboard reed 2. Further, the string 7 is stretched substantially horizontally on the frame 25 with its both ends locked to a tuning pin 26 and a frame pin (not shown) with a predetermined tension.

A well-known damper mechanism 30 is disposed behind the key 3 and operates in conjunction with the key depression operation of the key 3. This damper mechanism 30 normally prevents free vibration of the string 7, and the damper lever 3
1. It consists of a damper wire 32, a damper 33, etc., and when the damper lever 31 is pushed up by the rear end of the key 3 in response to a key press operation, the damper wire 32 is raised and the damper 33 is separated from the string 7. ing.

Now, the muffler device 40 that characterizes this invention
is equipped with a muffler rod 41 (see FIGS. 2 and 3) that extends commonly to all strings 7. This muffler rod 41 is disposed below the string 7 and on the rear side of the hammer felt 18, and its both ends are rotatably supported by a bracket mounting plate 42 and a bracket 43, respectively. , the bracket mounting plate 42 is fixed to the middle stile 44 with screws. A buffer member 45 made of a flexible material such as leather, felt, or non-woven fabric and having a certain degree of rigidity is fixed to the muffler rod 41 at its upper end and hangs down therefrom. A large number of notches 46 are formed in this buffer member 45 within a range that does not reduce the overall rigidity so as not to be affected by the string strikes of adjacent keys when playing soft notes.

Further, a sounding mechanism 47 is disposed at one end of the muffler rod 41. This sounding mechanism 47 is connected to a connecting member 48 that is fitted and fixed to the muffler rod 41.
and a magnet 49, this magnet 49
As the muffler rod 41 rotates, it is configured to generate a ``click'' sound each time it comes into contact with the upper and lower surfaces of the bracket 43 as shown by the chain lines in FIG. 3. Moreover, the magnet 49
is attracted to the bracket 43 to hold the muffler rod 41 in its rotational position, thereby switching the buffer member 45 between the states shown by the solid line and the chain line in FIG. This switching operation is performed by an operating lever 51 disposed via a bracket 50 at an appropriate location on the front end of the lower surface of the shelf board 1. The operating lever 51 and the connecting member 48 are connected by a wire 52, and the wire 52 is urged toward the connecting member 48 by a spring 53. Therefore,
The connecting member 48 is normally held in a position where the magnet 49 contacts and attracts the upper surface of the bracket 43, and in this state, the buffer member 45 maintains the hanging state shown by the solid line in FIG. 1, allowing normal performance. There is. To switch from the normal performance state to the soft performance state, the operating lever 51 can be pulled toward the user. Then, the wire 52 is pulled against the spring 53 and the connecting member 48 is rotated clockwise in FIG. and the hammer felt 18. Therefore, when the key 3 is operated in this state, and the action mechanism 6 is operated in conjunction with this to rotate and fly the hammer shank 20 upward, the hammer felt 18 is applied to the string via the buffer member 45. 7, the striking force is weakened and the sound volume is reduced. Note that the operating lever 51 is locked in the pulled position.

According to the muffler device 40 having such a configuration, switching between normal performance and soft tone performance can be easily performed using the operating lever 51.
Further, since the operating lever 51 is operatively connected to the connecting member 48 by the wire 52, its attachment position can be freely selected. Further, since the buffer member 45 is normally located behind the hammer, it does not interfere with the adjustment and assembly work of the action mechanism 6, and does not reduce work efficiency. Furthermore, since the sounding mechanism 40 emits a sound when the operating lever 51 performs a switching operation, the switching can be reliably confirmed.
Furthermore, since the sound generating mechanism 47 has a function of maintaining the switching state, it has the advantage that there is no possibility of unexpectedly switching from the normal performance state to the low tone performance state or vice versa during the performance.

Although the above embodiment uses the magnet 49 as the sounding mechanism 47, the present invention is not limited to this and various modifications are possible. The arrangement position is not limited to the muffler rod 41, but may be provided at the operating lever 51.

Further, in the above embodiment, the muffler rod 41 extends commonly to all the strings 7, but if necessary, it may be divided or the arrangement may be omitted in the high range, etc., and the cushioning member 45 may be fixed. Therefore, it is preferable to provide a flange portion on the muffler rod 41 along the longitudinal direction by an appropriate method such as integrally extruding it with the rod-shaped portion or fixing it as a separate item. In addition, a large number of cuts 4 are provided in the buffer member 45.
6 can also be omitted by appropriately selecting the material, thickness, etc. of the buffer member 45.

Further, in the above embodiment, an operating lever 51 and a wire 52 are used as operating means, and one end of the wire 52 is connected to the connecting member 48. However, a knee lever or a pedal may be used instead of the operating lever 51, and the connecting member 48 may be replaced with a knee lever or a pedal. It may be omitted and connected directly to the muffler rod 41. Furthermore, although the wire 52 is used to transmit the input operation of the operating means, any suitable means such as a rod or a link device may be used.
Connect one end to the rack and connect the rack to the wire 5.
Various changes are possible, such as fixing a pinion that easily meshes with the muffler rod 41, or interposing a link.

〔Effect of the invention〕

As explained above, according to the grand piano according to the present invention, it is possible to reliably switch between normal performance and soft tone performance with a simple structure, and it does not affect the string strikes of adjacent keys during soft tone performance. Since the buffer member hangs down when inactive, it does not deform over time and has excellent shape stability.Furthermore, it is equipped with a sounding mechanism, so switching can be confirmed, and the position can be adjusted by rotation. This has great effects, such as simplifying the movement mechanism and making it possible to manufacture and provide it at low cost.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the action mechanism of a grand piano according to the invention, FIG. 2 is a perspective view of the muffler device, and FIG. 3 is a side view of the sounding mechanism. 3...Key, 6...Action mechanism, 7...Strings,
18...Hammer felt, 40...Muffler device, 41...Muffler rod, 45...Buffer member, 4
6...notch, 47...sounding mechanism, 51...operation lever, 52...wire.

Claims (1)

[Scope of Claims] 1. A muffler rod 41, a buffer member 45, and an operating means 51 are provided, and the muffler rod 41 is rotatably disposed below the string 7 and extends in a direction across the string 7. The buffer member 45 has a number of notches 46 at predetermined intervals along the muffler rod 41, and one end is fixed to the muffler rod 41 and hangs down in an inactive state, and the operating means 51 rotates the muffler rod 41. A grand piano characterized in that the buffer member 45 is interposed between the string 7 and the hammer 18 by moving the damper member 45. 2. The grand piano according to claim 1, wherein the muffler rod 41 is arranged behind the hammer 18 and below the strings 7. 3 The operation means 51 is connected to the operation lever 51 and the wire 5
2. A grand piano according to claim 1 or 2, characterized in that the grand piano comprises: 2. 4 Comprising a muffler rod 41, a buffer member 45, an operating means 51, and a sounding mechanism 47, the muffler rod 41 is rotatably disposed below the string 7 and extends in a direction across the string 7, The buffer member 45 has a number of notches 46 at predetermined intervals along the muffler rod 41, one end is fixed to the muffler rod 41 and hangs down in an inactive state, and the operating means 51 rotates the muffler rod 41. The grand piano is characterized in that the buffer member 45 is interposed between the string 7 and the hammer 18, and the sounding mechanism 47 emits a sound when the operating means 51 is operated.