JPH08314442A - Production of damper for keyboard musical instrument - Google Patents

Abstract

PURPOSE: To decrease the kinds of mounting members and to facilitate the management of these parts without need for previously producing the mounting members having the length equal to the action divisions. CONSTITUTION: A member 45 having the length approximately equal to the width over the entire part of an action mechanism having the max. width is prepd. Display parts 46 indicating the cut positions meeting the action divisions are displayed on this member 45. Next, the member 45 is cut to the length coinciding with the action divisions of a keyboard musical instrument into which dampers are built, by which plural pieces of the mounting members 2 are produced. These mounting members 2 are fixed to a turning shaft 1 by means of screws 48. A cushion material 47 is cut to a prescribed length to form shock absorbing members 3, which are then fixed to the respective mounting members 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of selectively switching between a normal performance in which a string is hit with a hammer and a non-string playing in which the rotation of the hammer is stopped immediately before the string is hit and the string is not hit. The present invention relates to a method for manufacturing a sound deadening device for a keyboard instrument.

[0002]

2. Description of the Related Art An upright piano that strikes a string with an action mechanism that operates in conjunction with a key depression operation on a keyboard,
Since keyboard musical instruments such as grand pianos have a high performance volume, they are provided with a weak sound mechanism for selectively reducing the performance volume. In the case of an upright piano, this weak sound mechanism reduces the distance between the string and the hammer by moving the hammer rail that locks the hammer assembly to the initial position by operating the pedal, to shorten the distance between the string and the hammer. We try to weaken the performance sound by weakening the power. On the other hand, in a grand piano, a muffler made of a cushioning material is interposed between the hammer and the strings by pedal operation to weaken the striking force of the hammer on the strings to reduce the sound.

Recently, with the diversification of musical instruments, there has been proposed a keyboard instrument capable of switching between a normal performance and a performance in which no string striking sound is generated (silent performance). In such a keyboard instrument, by incorporating a sensor such as a key sensor or a pedal sensor for detecting the movement of a key, a natural piano is played during a normal performance in which a string is vibrated to produce a sound. It is possible to perform a musical performance of an electronic piano in which a sensor controls a musical tone control circuit to generate an electronic tone without producing a string during a mute performance. Various muffling devices that do not generate a string striking sound have been proposed, and one example thereof is, for example, Japanese Patent Laid-Open No. 6-5.
A silencer disclosed in 9667 is known. Figure 9
And this muffling device is shown in FIG. Here, 1 is a rotating shaft, 2 is a mounting member, 3 is a shock absorbing member, and these constitute a blocking means 4. 5 is a hammer shank,
A hammer head 6 and a hammer wood 7 constitute a hammer 8. 9 is a string, 10 is a damper mechanism, and this damper mechanism 10 is a damper wire 1
1, a damper 12, a damper lever 13 and the like. The blocking means 4 of the muffler is arranged between the string 9 and the hammer 8, and the turning shaft 1 is turned by a switching means (not shown) so that the string striking mode and the chain double-dashed line shown in FIG. The mode is switched to the non-string striking mode shown. The mounting member 2 and the shock absorbing member 3 are divided into lengths that match the action ratio. In the string striking mode, the shock absorbing member 3 is retracted out of the orbit of the hammer shank 5 and is directed downward. At this time, the hammer shank 5 is not blocked from being rotated by the blocking means 4, and the hammer head 6 strikes the string 9 to allow normal performance. When the string striking mode is switched to the non-string striking mode, the shock absorbing member 3 moves into the rotation path of the hammer shank 5 and faces the hammer shank 5. When the hammer 8 is operated in this state, the hammer shank 5 contacts the shock absorbing member 3 immediately before the hammer head 6 strikes the string 9. Therefore, the hammer head 6 cannot hit the string 9 and can perform non-string playing. Here, the action split means that the action mechanism is divided into a plurality of action mechanisms that are grouped according to the position of the rib of the frame on which the strings 9 are stretched or the action bracket to which the action mechanism is attached. Is divided into low, middle and high range or divided into low range and middle and high range.

[0004]

However, the above-described conventional silencer has the following problems. That is, in the piano, the size and shape of the frame, the position of the action bracket, and the like differ depending on the model, so that the width of the entire action mechanism in each group divided into actions also differs. Therefore, conventionally, the mounting member 2 having a length corresponding to the action rate has been manufactured for each model. Therefore, there is a problem that the manufacturing of the mounting member 2 is troublesome, the number of types is increased, and the parts management is troublesome. Also, when incorporating a silencer into an existing product,
There was also a problem that a mounting member having a length suitable for the action rate had to be prepared.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to eliminate the need to preliminarily manufacture a mounting member having a length corresponding to an action split, and to select the type of mounting member. It is an object of the present invention to provide a method of manufacturing a sound deadening device for a keyboard musical instrument, the number of which is reduced and the parts can be easily managed.

[0006]

In order to achieve the above-mentioned object, the present invention provides a support member which can take two positions, a normal position and a sound deadening position, a mounting member fixed to this supporting member, and this mounting member. For a keyboard instrument, which has a shock-absorbing member fixed to the above, does not prevent rotation of the hammer shank during normal performance, and prevents rotation of the hammer shank immediately before the hammer strikes a string when playing a string. In the method of manufacturing a silencer, a step of manufacturing a member having a length substantially the same as the width of the action mechanism having the maximum width, and cutting this member into a length corresponding to the action rate of the keyboard instrument in which the silencer is incorporated. Then, a step of manufacturing the mounting member and a step of fixing the mounting member to the support member are provided. Further, the present invention comprises a support member capable of taking two positions, a normal position and a sound deadening position, an attachment member fixed to the support member, and a cushioning member fixed to the attachment member, and is provided at the time of normal performance. Is a method for manufacturing a silencer for a keyboard instrument, which does not prevent the rotation of the hammer shank and prevents the rotation of the hammer shank immediately before the hammer strikes a string when not striking a string. A step of manufacturing a member having a length substantially equal to the width, a step of fixing the member to the supporting member, and a step of cutting the member into a length corresponding to an action rate of a keyboard instrument in which a silencer is incorporated. And a step of manufacturing the mounting member. Further, the present invention is characterized by including a step of displaying a display section showing a cutting position according to the action split on a member having a length substantially the same as the width of the action mechanism having the maximum width.

[0007]

In the present invention, a member having a length substantially the same as the width of the action mechanism having the maximum width is prepared, and this member is cut into a length corresponding to the action division of the keyboard instrument to which the silencer is assembled. The mounting member is manufactured by. Prior to this cutting, the cutting position corresponding to the action division is displayed on the member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a side view showing an action mechanism section of an upright piano equipped with a muffling device manufactured by the method according to the present invention in a state of normal playing, and FIG. 2 is a hammer, a damper mechanism and a blocking member in a non-string playing performance. 3A and 3B are a front view and a plan view in which a part of the blocking means is broken, and FIG. 4 is a side view of the blocking means. The same members as those described in the section of the prior art are designated by the same reference numerals, and detailed description thereof will be omitted. Further, this embodiment shows an action mechanism in the high range. In these drawings, for example, four action brackets 20 are erected in front of the strings 9 at predetermined intervals in the direction in which the action mechanisms 21 are arranged side by side, and all the strings 9 are attached to these action brackets 20. A center rail 22 extending in common is fixed. Further, a plurality of action mechanisms 21 and a damper mechanism 10, which operate in conjunction with a keyboard (not shown) and strike the corresponding strings 9, are attached to the center rail 22. in this case,
In this embodiment, the action mechanism 21 is divided by the action bracket 20 into groups of low, middle, and high notes.

The action mechanism 21 includes a hammer 8,
The center rail 22 is provided with a bat 23 rotatably attached to the bat 23. When the bat 23 is pushed up by a jack (not shown) that is raised by a key pressing operation on the keyboard, the hammer 8 is rotated integrally with the bat 23. String 9
Is configured to strike. Damper mechanism 10
In general, the damper 12 presses the string 9 by the spring force of the damper lever spring 24 to prevent the string 9 from freely vibrating, and the damper lever 13 is rotated clockwise in conjunction with the action mechanism 21. By doing so, the damper 12 is configured to be separated from the string 9. After the damper 12 is separated from the string 9, the hammer 8 strikes the string 9 to enable normal playing.

The damper mechanism 10 and the action mechanism 21 described above are constructed in the same manner as the damper mechanism and the action mechanism of an upright piano that are well known in the past.

In the space between the damper mechanism 10 and the hammer shank 5, a blocking means 31 is arranged to block the rotation of the hammer shank 5 immediately before striking a string when playing a string. Further, below the instrument body, a switching means 32 for activating the blocking means 31 to switch between a string striking mode and a non-string striking mode is arranged. With these, the above-mentioned key touch feeling during normal playing is not lost. A device for enabling non-string striking performance that does not generate a string sound, that is, a muffling device 30 is configured.

The blocking means 31 comprises a plurality of brackets 34, a rotatable shaft 1, a mounting member 2, a shock absorbing member 3 made of felt or the like, and shock absorbing members 35A, 35B for dampers. It is configured.

The bracket 34 is formed of a metal (eg, steel) or the like into an L-shape having a vertically long side view,
It is erected on the center rail 22 at a position facing each action bracket 20 so as not to hinder the operation of the action mechanism 21.

The rotating shaft 1 is rotatably supported by a bearing portion 34a provided at the upper end of the bracket 34 so that its axis line is aligned with the juxtaposed direction of the action mechanism 21. It has a length extending in common to all action mechanisms 21. The rotating shaft 1 is not limited to one configured by one long shaft, but may be formed by connecting a series of short shafts formed separately for each section. Further, the rotating shaft 1 has a damper stop function by restricting further rotation by contact of the damper wire 11 when the damper lever 13 rotates clockwise by a certain angle.
The shock absorbing member 35A for the damper is fixed to the front surface of the rotating shaft 1 in order to absorb the shock and noise when the damper wire 11 comes into contact with the rotating shaft 1. Also, the rotating shaft 1
The installation height of is approximately equal to the height in the conventional device shown in FIG.

Further, a connecting plate 36 is fixed to one end of the rotating shaft 1 as shown in FIGS. 3 and 4, and the switching means 32 is a connecting member composed of a wire, a protruding rod or the like. They are connected via 37. Here, in the present embodiment, the pedal is shown as the switching means 32, but the present invention is not limited to this, and an operating lever may be used, or a drive motor, a solenoid or the like may be used. Also, the rotating shaft 1
Stoppers 38 are fixed to both ends of the.
The stopper 38 regulates the movement of the rotary shaft 1 in the left-right direction (keyboard arranging direction) by contacting the action bracket 20 and the like.

The mounting member 2 is formed of a metal plate having high rigidity in a V-shape when viewed from the side. The hammer shank 5 and the damper 5 are used in both normal playing and non-string playing performances. The lower end is fixed to the rotary shaft 1 at a mounting angle at which the mechanism 10 does not hit. Therefore, in the string striking mode, the mounting member 2 is tilted by the required angle toward the string 9 side as shown in FIG. 1, and when switched to the non-string striking mode, it is tilted toward the hammer shank 5 side as shown in FIG. It has become so. In the non-string striking mode, the inclination angle of the upper end portion of the hammer shank 5 is set to be substantially equal to the inclination angle of the hammer shank 5 when the hammer shank 5 contacts the impact absorbing member 3.
Further, as shown in FIG. 3, the mounting member 2 is manufactured separately for each of the low, middle and treble action mechanisms 21 according to the action split, and is attached to the rotary shaft 1 so as to be located between the adjacent action brackets 20. The shock absorbing member 3 is fixed and fixed to the upper end of the front surface thereof.

Here, the hammer 8 positioned at the lower end of the midrange is at a higher position than the other hammers 8 because the strings 9 intersect at that portion as described above. At the same time, the damper mechanism 10 provided corresponding to the hammer 8 is also at a position higher than the others. Therefore, the middle-range mounting member 2 fixed to the central portion of the rotary shaft 1 is inclined so that the left end portion 2a thereof is higher than the other portions, as shown in FIG. Therefore, the impact absorbing member 3 in this portion is also inclined so as to be higher than the other portions.

In this case, the heights of all the mounting members 2 manufactured according to the action split are not set to be the same,
It may be changed for each range. That is, the hammer head 6
The size of the sound varies depending on the action mechanism in the low, middle, and treble ranges, with the lowest range being the largest, followed by the middle range and the high range being the smallest. For this reason, the gap between the hammer head 6 and the damper 12 becomes wider in the order of low, middle, and treble, so that as shown in FIG.
It is advisable to make the pitches of low, middle, and high frequencies higher in this order. In this way, hammer head 6 and damper 12
When the height of each mounting member 2 is changed in accordance with the gap between the mounting member 2 and the mounting member 2, the height of the shock absorbing member 3 fixed to the upper end of the mounting member 2 is also different, and the height can be increased in the order of low, middle, and high sound range.

The shock absorbing member 3 is positioned above the rotary shaft 1 by being fixed to the upper end of the front surface of the mounting member 2, that is, the upper portion of the surface facing the hammer shank 5. When the shock absorbing member 3 is provided above the rotating shaft 1 in this manner, the higher portion of the hammer shank 5 can be received and the bending thereof can be reduced. Further, the front surface of the shock absorbing member 3, that is, the contact surface with the hammer shank 5, is set at substantially the same angle as the hammer shank 5 when the hammer shank 5 contacts the shock absorbing member 3. With this arrangement, when the hammer shank 5 comes into contact with the front surface of the shock absorbing member 3, component force is not generated and rattling of the blocking means 31 and damage of the hammer shank 5 can be prevented. In this case, since the upper portion of the mounting member 2 faces the hammer shank 5 substantially in parallel with each other during the non-string striking performance as described above, the thickness of the shock absorbing member 3 is set to be equal over the entire length.

The damper impact absorbing member 35B is fixed to a portion corresponding to the damper block screw 40 on the back surface of the mounting member 2 so that the screw 40 does not directly contact the mounting member 2.

Next, the operation of the muffling device 30 during a non-string striking performance will be described. When switching from the string striking mode to the non-string striking mode, the pedal 32, which is a switching means, is depressed to rotate the rotary shaft 1 in the clockwise direction in FIG. 1 by a predetermined angle. That is, when the rotating shaft 1 is rotated, the mounting member 2 is rotated together with the rotating shaft 1 to move the shock absorbing member 3 into the rotating path of the mounting member 2 and the hammer shank 5, thereby Switch from string striking mode to non-string striking mode. FIG. 2 shows this state. Next, when the keyboard is depressed in this state, the bat 23 is pushed up by a jack (not shown) and rotated counterclockwise. Therefore, the hammer 8 also rotates integrally with the bat 23. However, at this time, immediately before the hammer head 6 hits the string 9, the hammer shank 5 comes into contact with the shock absorbing member 3 and is prevented from rotating further, so that the hammer 8 is
Does not hit the string 9 and bounces back to the initial position. Therefore, the string-playing performance is a non-string-playing sound.

Next, a method for manufacturing the above-mentioned blocking means 31 will be described. 6 (a) to 6 (d) are views for explaining the manufacturing procedure of the blocking means. The same components as those shown in FIGS. 1 to 5 are designated by the same reference numerals. In the same figure, first, a member 45 formed of a slender plate-like body having a V shape in side view is prepared (a). The member 45 is made of a material that is relatively easy to cut, such as a metal plate made of an aluminum alloy, a magnesium alloy, or the like, or a synthetic resin. The length L of the member 45 is set to be substantially equal to the width of the entire action mechanism of the upright piano, which has the largest width of the entire action mechanism. Next, on the surface of the member 45, a display unit 46 that displays a cutting position when the member 45 is cut into lengths that match the action divisions of the low, middle, and treble ranges is printed, engraved, dented, cut, etc. Display by. In this case, since the action rate differs depending on the model of the piano as described above, the action rate of all models is displayed.

Next, the member 45 is cut at the cutting position indicating the action split of the upright piano in which the blocking means 31 is to be incorporated, thereby creating the mounting member 2 for the low, middle and treble ranges (b). Then, the mounting member 2 is fixed to the rotary shaft 1 with screws 48 at predetermined intervals (c). Next, the shock absorbing members 3 are fixed to the surfaces thereof (d). The shock absorbing member 3 is obtained by cutting a long strip-shaped cushion member 47 into the length of each mounting member 2. In this case, the order of the working steps (c) and (d) may be reversed and the shock absorbing member 3 may be fixed to each mounting member 2, and then the mounting member 2 may be mounted to the rotating shaft 1. In addition, before cutting the member 45, the cushion material 47 is fixed over its entire length, and then the member 4 is cut.
5 may be cut together with the cushion material 47 to manufacture the mounting member 2 for each range.

Further, as shown in FIGS. 7A to 7C, a member 45 to which a cushion material 47 is fixed is fixed to the rotary shaft 1 by a plurality of screws 48, and the rear member 45 is divided into action parts. You may make it cut | disconnect to the length which corresponds and manufacture the attachment member 2 of each range.

In such a muffling device 30, a member 45 having a length substantially equal to the width of the action mechanism having the maximum width is prepared, and this member 45 has a length corresponding to the action ratio of the piano in which the muffling device 30 is incorporated. Since the mounting member 2 is manufactured by cutting the mounting member 2 into pieces, it is not necessary to manufacture a mounting member having a length corresponding to the action ratio of each low, middle, and high range in advance, and the mounting member can be easily manufactured. The number of parts can be reduced. Here, when a silencer is later installed in a commercially available piano, the installation work is usually performed outside the factory (for example, the house of the owner of the piano).
Done in. At that time, the step of “displaying the display unit 46 on the member 45” shown in FIG. 6A or FIG. 7A is performed in advance in the factory, and the member can be seen while observing the display on the display site. By performing the step of cutting 45, etc., it becomes possible to efficiently perform the work on site. Moreover, if the notch is formed as the display unit 46, the work of cutting the member 45 at the site becomes easier.

FIGS. 8A and 8B are views for explaining still another embodiment of the present invention. In this embodiment, a cushion material 47 is fixed to a member 45 made of a long rod-shaped body made of wood or synthetic resin over its entire length, then the member 45 is fixed to the rotary shaft 1, and then the rear member 45 is attached. By cutting with cushion material 47 to a length that matches the action split, each low, medium,
The mounting member 23 in the high range is manufactured. However, the cushion member 47 is not fixed to the member 45 in advance, the member 45 is cut to manufacture the mounting member 2, and then the cushion member 47 is cut into a length corresponding to the action rate to form the shock absorbing member 3.
This may be fixed to each mounting member 2. Since the member 45 made of such an elongated rod-shaped member can be made of wood or synthetic resin,
It is inexpensive and easy to cut.

In the above embodiment, an example in which the present invention is applied to a silencer incorporated in an upright piano has been described, but the present invention can also be applied to a silencer incorporated in a grand piano. Further, although the above-described embodiment is applied to the upright piano in which the action bracket 20 divides the action into three parts of low, middle and high range, the present invention is not limited to this, and for example, low range, middle and high range. It can also be applied to an action divided into two ranges. Further, in the present embodiment, the rotating shaft is shown as the supporting member capable of taking the two positions of the normal position and the muffling position, but the present invention is not limited to this, and is provided so as to be movable in the longitudinal direction of the keyboard. It may be one. Further, although the above-described embodiment shows the keyboard musical instrument in which the rotation of the hammer shank 5 is directly stopped, the rotation of the catcher 50 (see FIG. 1) provided on the bat 23 results in a stop. The hammer shank 5 may be stopped.

[0028]

As described above, in the method of manufacturing the silencer for keyboard musical instruments according to the present invention, a member having a length substantially the same as the width of the action mechanism having the maximum width is prepared, and this silencer is used. By dividing it into a length that matches the action split of the keyboard instrument in which the
Since it is not necessary to previously manufacture a mounting member having a length corresponding to the action split for each keyboard instrument having a different action split, the mounting member can be easily manufactured and the number of parts can be reduced. Further, even if the action allocation is changed, it can be dealt with without changing the design of the mounting member. In addition, since the member displays the cutting position corresponding to the action division, the cutting position can be easily confirmed, and the cutting work is easy.

[Brief description of drawings]

FIG. 1 is a side view showing a state of a normal performance of an action mechanism section of an upright piano equipped with a muffling device manufactured by a manufacturing method according to the present invention.

FIG. 2 is a diagram showing a relationship between a hammer, a damper mechanism, and a blocking means during a non-strike performance.

3 (a) and 3 (b) are a front view with a part of the blocking means cut away and a plan view with a part broken away.

FIG. 4 is a side view of the blocking means.

FIG. 5 is a front view of a mounting member.

6 (a) to 6 (d) are views for explaining a manufacturing procedure of the blocking means.

7A to 7C are diagrams showing another embodiment of the present invention.

8A and 8B are views showing still another embodiment of the present invention.

FIG. 9 is a side view of an action mechanism section of a conventional keyboard instrument equipped with a muffling device.

FIG. 10 is a perspective view showing a conventional example of blocking means.

[Explanation of symbols]

1 ... Rotating shaft, 2 ... Mounting member, 3 ... Impact absorbing member, 5 ... Hammer shank, 6 ... Hammer head, 7 ... Hammerwood, 8 ... Hammer, 9 ... String, 10 ... Damper mechanism, 2
0 ... action bracket, 21 ... action mechanism, 3
DESCRIPTION OF SYMBOLS 1 ... Blocking means, 32 ... Switching means, 45 ... Member, 46 ... Display part, 47 ... Cushion material.

Claims (3)

[Claims] 1. A support member capable of taking two positions, a normal position and a muffling position, and a mounting member fixed to the support member,
A cushioning member fixed to this mounting member is provided, which does not prevent the hammer shank from rotating during normal playing,
In a method of manufacturing a silencer for a keyboard instrument that prevents the hammer shank from rotating immediately before a hammer strikes a string when playing a string, a member having a length substantially the same as the width of the action mechanism having the maximum width is manufactured. A step of manufacturing the mounting member by cutting the member into a length corresponding to an action ratio of a keyboard instrument in which the muffling device is incorporated, and a step of fixing the mounting member to the support member. A method of manufacturing a silencer for a keyboard instrument, which is characterized by the above. 2. A support member capable of taking two positions, a normal position and a sound deadening position, and a mounting member fixed to the support member.
A cushioning member fixed to this mounting member is provided, which does not prevent the hammer shank from rotating during normal playing,
In a method of manufacturing a silencer for a keyboard instrument that prevents the hammer shank from rotating immediately before a hammer strikes a string when playing a string, a member having a length substantially the same as the width of the action mechanism having the maximum width is manufactured. And a step of fixing the member to the support member, and a step of manufacturing the mounting member by cutting the member into a length corresponding to an action rate of a keyboard instrument in which a silencer is incorporated. And a method for manufacturing a sound deadening device for a keyboard instrument. 3. The method of manufacturing a silencer for a keyboard instrument according to claim 1 or 2, wherein a cutting position corresponding to an action split is shown on a member having a length substantially the same as the width of the action mechanism having the maximum width. A method of manufacturing a silencer for a keyboard instrument, comprising a step of displaying a display section.