CN114299897A - Hammer head, processing method and application thereof, and piano with fourth pedal - Google Patents

Abstract

The invention relates to a hammer, a processing method and application thereof, and a piano with a fourth pedal, belonging to the field of musical instruments and aiming at the current situation that the tone of the existing piano is fixed, wherein the hammer comprises a hammer wood shoe last and a hammer striking material, the hammer striking material consists of a hammer striking material I and a hammer striking material II with different hardness, the hammer striking material I and the hammer striking material II are alternately arranged, and the hammer striking material II is a material with the hardness larger than or smaller than that of the hammer striking material I; the string-striking machine adopts the hammer head; the piano adopts the string-striking machine, and the pedal system also includes the variable-pitch pedal, the variable-pitch pedal is used for driving the displacement of the hammer, when pressing the key, the hammer striking material two on the hammer strikes the string and produces the timbre different from the hammer striking material one vibration frequency; the hammer processing method comprises the steps of fixedly connecting a hammer striking material I and a hammer striking material II in an interlayer overlapping mode, and fixing the hammer striking material integrally on a hammer wooden shoe last in an adhering mode. The invention can keep the original tone and add new tone when the piano is played.

Description

Hammer head, processing method and application thereof, and piano with fourth pedal

The technical field is as follows:

the invention belongs to the technical field of musical instruments, and particularly relates to a hammer, a processing method and application thereof, and a piano with a fourth pedal.

Background art:

the piano invented in 1709 by the italian person of bartoloo cri dorsifier (Bartolomeo Christofori) is a keyboard instrument in western classical music, and is a well known name of "king of instrument", and modern pianos are mainly classified into upright pianos and grand pianos in appearance.

Grand piano is the most primitive form of piano, also called grand platform piano, generally is used for the performance of concert, is a heavy and natural object, and its shell length is from 1.3m to 5m, has higher acoustic quality and performance, and grand piano volume is big, and tone quality is pure and plump, and the molding is pleasing to the eye soul, generally is used for professional occasions such as school, performance hall, theater, big theater, etc. In order to solve the problem of occupation of land, an upright piano has been invented. The vertical piano adopts a design scheme that the strings are installed in a staggered mode, and the balance problem of space requirements and tone volume is solved. Grand piano is a piano key operated on lie, which is superior to upright piano in speed and stability, and in order to enable a player to change the tone and volume of the piano as desired while playing, the piano is provided with a pedal system, which is generally composed of three pedals, but the pedal systems of grand piano and upright piano are not completely the same. The three pedals of the grand piano are respectively, from the perspective of the player: the left pedal is a mute pedal, when the left pedal is stepped on, the keys and the hammers are integrally moved rightwards, so that the strings struck by the hammers are not three strings but two strings, and the aim of muting is fulfilled; the middle pedal is a special selective damper pedal, and when the music is played, if only one sound needs to be prolonged and the pedal does not need to prolong other sounds, the selective damper pedal is needed and is often involved in playing impression group works; when the right pedal is also called a damper pedal, dampers of the whole piano are all far away from strings when the right pedal is stepped on, so that the strings which are not excited by the hammers generate resonance, and the tone color is greatly enriched while the volume is enhanced.

The piano good sound quality 1/4 is attributed to the hammers, which play an extremely important role in the timbre of the piano. Without good hammer heads, the better pianos will be abandoned; conversely, a good pair of hammers can make the tone of the piano greatly improved. It can be said that the good resonance system on the piano is finally realized by the hammers. In general, in order to change the tone, people usually heat the felt of the hammer head to shrink the felt after heating, so as to change the local elasticity of the felt and further change the tone of the struck string, but because the tone of the piano is shaped when leaving the factory, the change can be performed only once on the original base layer, and the change is limited, namely, the tone of the piano can be changed only in a limited range. At present, no piano is available, and different new timbres are presented on a base layer with the original existing timbre function, so that the expressive force of the piano is enriched.

The invention content is as follows:

the invention provides a hammer head, a processing method and application thereof and a piano with a fourth pedal for overcoming the defect that the tone quality of the existing piano can not be changed after being fixed, and the tone quality of the piano is improved by changing the structure of the hammer head.

The technical scheme adopted by the invention is as follows:

a hammer, comprising: the string hammering device comprises a hammering wood last and a hammering material arranged at one end of the hammering wood last and used for knocking strings, wherein the hammering material comprises a hammering material I and a hammering material II which have different hardness, the hammering material I and the hammering material II are alternately arranged, and the hammering material II is a material with hardness larger than or smaller than that of the hammering material I.

Preferably, the hammering material is made of wool felt.

A method for processing a hammer head, wherein the hammer head consists of a hammer head wood shoe last and a hammer head striking material, and the hammer head striking material is arranged on a striking surface of the hammer head wood shoe last, comprises the following steps:

step 1: the hammering material comprises a first hammering material and a second hammering material which are alternately arranged, and every two adjacent first hammering materials and second hammering materials are fixedly connected with each other in an adhesion mode;

step 2: and fixing the first hammering material and the second hammering material which are fixed into a whole on one side of the hammering surface of the hammering wood last in an adhering mode.

Preferably, the method further comprises the step 3: and at least two positioning and mounting holes for mounting the hammer shank are processed on the hammer wood last.

The application of the hammer in the string-striking machine, the said string-striking machine is used for connecting hammer and key, the hammer is installed on one side of the string-striking machine through the hammer shank, the key is installed on another side of the string-striking machine, when the hammer on the said hammer strikes the material two and strikes the string, can send out the timbre different from hammer striking material one vibration frequency.

Preferably, different positioning and mounting holes are formed in the hammer wood last, and the hammer handle enables different hammer striking materials on the hammer to strike strings according to different positions of the positioning and mounting holes.

A piano with fourth pedal, comprising: a string-striking machine, a hammer, a key, a string, a pedal system and a transmission connecting rod assembly,

the string-striking machine is used for connecting the hammer heads and the keys, and the string-striking machine is jacked up by the keys to drive the hammer heads to strike strings;

the strings are arranged above the corresponding hammers, and each hammer corresponds to one same-note string group;

the pedal system comprises a mute pedal, a selective sound-delaying pedal and a sound-delaying pedal, wherein the mute pedal is connected with the transmission connecting rod assembly; the string-striking machine uses the string-striking machine, and the pedal system further comprises a fourth pedal which is a tone-changing pedal, the tone-changing pedal is connected with the transmission connecting rod assembly and used for driving the hammer to move, when the keys are pressed, the hammer striking material II on the hammer strikes the strings and produces a tone different from the vibration frequency of the hammer striking material I.

Preferably, when the shift pedal is in the excited state, the hammers strike the strings in the same number as the strings in the corresponding homophonic group.

Preferably, transmission link assembly includes pedal ejector pin, pedestal and pendulum rod, the pedestal is installed on the piano casing, the pendulum rod level articulates on the pedestal, and the mute footboard and the change footboard articulate the both sides at the pendulum rod through the pedal ejector pin respectively, through the horizontal hunting of control pendulum rod, realize that the hammer strikes the mute or the change effect of string.

Preferably, the first hammer materials and the second hammer materials which are alternately arranged are three layers.

The invention has the beneficial effects that:

1. the present invention changes the structure of the hammer striking material on the existing hammer, and adds another material on the basis of the existing single hammer striking material I, namely, the hammer striking material II, and the two materials which are alternately arranged during playing can not only keep the original tone, but also increase the new tone.

2. The first hammering material and the second hammering material are alternately fixed, and the selected second hammering material does not belong to fiber materials, so that the stability of the first hammering material on the wooden last of the hammer is effectively improved by utilizing the characteristic of easy sticking and fixing of the second hammering material, the defect of poor stability of the fiber materials during sticking is avoided, and the use of the hammer nail is also avoided.

3. The second hammer striking material of the hammer can be selected according to requirements, and the characteristics of different vibration frequencies generated by materials with different hardness are utilized, so that the tone of the piano is increased when the string striking machine strikes the strings, and the tone expression of the piano is increased in the maximum range.

4. On the basis of keeping the playing habit of the original grand piano as much as possible, the invention uses the fourth pedal, namely the tone-changing pedal, to ensure that when the hammer strikes the string, the hammer striking material II on the hammer strikes the string to generate the vibration frequency different from the prior hammer felt, so that the tone and the volume in the whole range are integrally emitted or strong or graceful, and the tone balance can not generate the phenomenon of over-strong or over-weak tone, thereby forming the unique tone with different styles of the prior piano.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of FIG. 1;

FIG. 3a is an enlarged view of FIG. 2 at A1, FIG. 3b is an enlarged view of FIG. 2 at A2, and FIG. 3c is an enlarged view of FIG. 2 at A3;

fig. 4 is a schematic structural view of the hammer;

FIG. 5 is another embodiment of striking material two;

FIG. 6 is a diagram of the connection of the pedal system to the drive link assembly;

FIG. 7 is a schematic view of the connection between the mute pedal, the shift pedal and the transmission linkage assembly;

FIG. 8 is an enlarged view of FIG. 7 at B;

FIG. 9 is a schematic structural view of the drive link assembly;

FIG. 10 is a front view of the pedestal;

FIG. 11 is a side view of FIG. 9;

FIG. 12 is a schematic structural diagram of a swing link;

FIG. 13 is a state diagram of the drive link assembly with the mute pedal in operation;

FIG. 14 is a state diagram of the drive link assembly with the tone varying pedal in operation;

wherein: 1 string striking machine, 2 hammers, 201 hammer striking material I, 202 hammer striking material II, 203 hammer wooden last, 204 positioning mounting holes, 205 bases, 206 hammer shanks, 3 keys, 4 strings, 5 pedal systems, 501 soft pedals, 502 variable pedals, 503 selective sound-extending pedals, 504 sound-extending pedals, 6 sound boards, 7 keyboard frames, 8 key side wood, 9 transmission connecting rod assemblies, 901 pedal push rods, 902 shaft frames, 9021 top through holes, 9022 bottom through grooves, 903 swing rods, 9031 cross rods, 9032 vertical rods, 9033 swing rod balls, 904 pin shafts, 905 compression springs and 906 push rod sleeves.

The specific implementation mode is as follows:

as shown in fig. 1, the grand piano designed and modified according to the present invention can maintain the original tone and add a new tone during playing, and includes a string striking machine 1, hammers 2, keys 3, strings 4, a pedal system 5, a soundboard 6, a keyboard frame 7, a key side bar 8, and a transmission link assembly 9.

As shown in fig. 2 to 3b, the grand piano is provided with 88 keys 3, each key 3 corresponding to a set of action 1 and hammer 2, the action 1 serving to connect the corresponding key 3 and hammer 2, the action 1 transmitting the finger force to the hammer 2 by the player pressing the key 3, and the hammer 2 striking the string 4 to produce vibration. The structure of the action 1 in this embodiment is the same as that of the existing action, and no structural change is made. The strings 4 are mounted on the sound board 6, and since each key 3 corresponds to one note, the same-note string group emitting the same pitch is provided above each hammer 2. And each hammer 2 in the middle to high range, above which the homophonic string group is composed of three strings 4 arranged in parallel.

As shown in fig. 4, the hammer 2 described in the present embodiment is improved in structure compared with the conventional hammer 2, and since the mass and elasticity of the hammer 2 have a great influence on the timbre of the strings 4, the conventional hammer 2 includes a hammer felt, a core felt, a hammer nail, and a hammer wood last, whereas the hammer 2 described in the present embodiment includes a first hammer striking material 201, a second hammer striking material 202, and a hammer wood last 203. The hardness of the first hammering material 201 is completely the same as that of the existing hammering felt, namely the first hammering material 201 is made of a wool felt material. The second hammering material 202 is a non-fiber material with the hardness greater than or less than that of the first hammering material 201, the first hammering material 201 and the second hammering material 202 are alternately arranged, the joint surface of the first hammering material 201 and the second hammering material 202 is an adhesive surface 206, the first hammering material 201 and the second hammering material 202 are fixedly connected with each other through the adhesive surface 206 and form a sandwich structure, and preferably, the first hammering material 201 and the second hammering material 202 are respectively designed to have three layers. Because the second hammering material 202 is made of non-fiber materials, the stability of the second hammering material 202 is better when the second hammering material is glued and fixed with the second hammering block last 203, and further, compared with the original fiber materials (such as wool felt), the stability of the first hammering material 201 fixed on the second hammering material 202 on the second hammering block last 203 is improved, and the auxiliary shaping by hammering is not needed.

Due to different materials, the object can generate different vibration frequencies after being knocked, different vibrations can emit different sounds, and a player can select materials according to needs, for example, the second hammering material 202 can be made of hard plastics and other materials with hardness higher than that of the first hammering material 201, and can emit crisp sounds during playing; the second hammering material 202 can also be made of materials with the hardness smaller than that of the first hammering material 201, such as silica gel, and can make soft sound during playing.

As a preferable design, as shown in fig. 5, in order to increase the contact area between the second hammering material 202 and the second hammering block 203, the plurality of second hammering materials 202 arranged in parallel at intervals are fixed on the base 205 made of the same material, and the second hammering material 202 and the base 205 are integrated into a whole structure, so that the whole structure is in a comb shape, and the fixing manner and the arrangement manner of the first hammering material 201 and the second hammering material 202 are kept unchanged.

A method of processing a hammer head, comprising the steps of:

step 1: the hammering material comprises a first hammering material 201 and a second hammering material 202 which are alternately arranged, the adjacent first hammering material 201 and the adjacent second hammering material 202 are fixedly connected with each other by an adhesive surface 206 in an adhesive mode, and other modes for fixing the first hammering material 201 and the second hammering material 202 can also be adopted, and the fixing mode is not limited to adhesion.

Step 2: when the first hammering material 201 and the second hammering material 202 are fixed into a whole, the second hammering material 202 is fixed on one side of the hammering surface of the hammering wood last 203 in a sticking mode. The second hammering material 202 has better bonding performance than the fiber material, so that the stability of the first hammering material on the wooden last 203 during pasting is improved, the current situation that the existing wool felt needs to be shaped through hammering nails during pasting with the wooden last 203 is changed, and the nailless fixing mode of the hammering material on the wooden last 203 is realized.

As a preferable design, the use of the hammer nail is not excluded in the step 2, and the hammer nail can be continuously used on the basis of the embodiment.

As a preferred design, the method further comprises the following step 3: at least two positioning and mounting holes 204 for mounting a hammer shank 206 are also processed on the hammer wood last 203, and the positioning and mounting holes 204 are arranged in parallel.

The action 1 of this embodiment strikes the string 4 with the hammer striking material of different material on the hammer 2 to realize the sound-changing function, and through the selection mechanism, the hammer 2 can strike the string 4 selectively with the hammer striking material one 201 or the hammer striking material two 202. When the hammer 2 strikes the string 4 with the hammer striking material one 201, the string 4 gives out the same tone as that of the conventional grand piano; when the hammer 2 strikes the string 4 with the hammer striking material two 202, the string 4 emits a change of tone different from that of the conventional grand piano. The selection mechanism can be in a pedal mode, for example, in a pedal mode, and also can be in a manual mode, for example, two parallel positioning mounting holes 204 are formed in the hammer wood last 203, and different hammer striking materials on the hammer 2 are enabled to strike the strings 4 through inserting the hammer handles 206 arranged on the string striking machine 1 into the different positioning mounting holes 204, and different timbres are generated.

As shown in fig. 6, the pedal system 5 changes the tone and volume of the piano by pedals, and in the present embodiment, a fourth pedal, namely a tone-changing pedal 502 is added to the existing pedal system 5 as necessary to enrich the tone expression of the piano by changing the tone. The four pedals are specifically as follows: the soft pedal 501, the inflexion pedal 502, the selective damper pedal 503 and the damper pedal 504, wherein the soft pedal 501, the selective damper pedal 503 and the damper pedal 504 have the same function as the existing grand piano pedal, and the embodiment is not substantially changed. In order to maximally adapt to the usage habit of the player for the existing pedal system 5, in the present embodiment, the additional soft pedal 502 is preferably disposed on the right side of the soft pedal 501, and this is taken as an example for description, from the perspective of the player, the four pedals of the pedal system 5 are the soft pedal 501, the soft pedal 502, the selective soft pedal 503 and the hammer pedal 504 in sequence from left to right, and the leftmost side of the string 2 is the first hammer striking material 201, the rightmost side thereof is the second hammer striking material 202, and the first hammer striking material 201 and the second hammer striking material 202 are alternately disposed in six layers.

In the existing design, the action 1, the hammer 2 and the key 3 are mounted on the keyboard frame 7, the keyboard frame 7 is mounted between the two key side bars 8, and because the keyboard frame 7 is usually moved to the right side when the existing grand piano realizes the mute function, the hammer 2 only strikes two strings, the reserved gap between the keyboard frame 7 and the right key side bar 8 is equal to the distance between the two strings 4 in the homophonic string group, and therefore the right movement of the keyboard frame 7 is taken as the basis of the prior art in the embodiment.

In this embodiment, a gap is left between the keyboard frame 7 and the key side member 8 on the left and right sides. Since the keyboard frame 7 can move leftward or rightward, the amount of the gap setting affects the stroke of the left-right movement of the keyboard frame 7, and from the perspective of the player, the gap setting between the keyboard frame 7 and the right key side wood 8 is the same as that of the conventional design, while the gap setting between the keyboard frame 7 and the left key side wood 8 is half of the distance between two adjacent strings 4 in the same tone string group. For convenience of description, the present embodiment is an improvement of a grand piano in that the keyboard tray 7 is moved rightward to realize a mute function of the grand piano, and in that the keyboard tray 7 is moved leftward. Vice versa, moving the keyboard tray 7 to the left to implement the existing mute function and to the right is the improvement proposed in this embodiment, and the same applies.

As shown in fig. 7 and 8, the mute pedal 501, the sound changing pedal 502, the selective sound delaying pedal 503 and the sound delaying pedal 504 are respectively connected to the transmission link assembly 9, and since the connection structure and function between the selective sound delaying pedal 503 and the sound delaying pedal 504 and the transmission link assembly 9 are not changed, which is the prior art means, the description is omitted in this embodiment. The mute pedal 501 and the tuning pedal 502 are both mounted on the pedal mounting box, and the embodiment only describes the connection structure and function of the mute pedal 501 and the tuning pedal 502 and the transmission link assembly 9.

When the action 1 is in the armed state, the hammers 2 and strings 4 are in the separated state; when the player presses and applies pressure to the key 3, the action 1 is in the excited state, and drives the hammer striking material one 201 or hammer striking material two 202 on the hammer 2 to strike the string 4, so that the string 4 is vibrated. As shown in fig. 9, the transmission link assembly 9 is used for enabling the soft pedal 501 or the sound-changing pedal 502 to be in an excited state, and includes two pedal push rods 901, a shaft bracket 902 and a swing rod 903, the pedal push rods 901 are arranged in parallel, the top ends of the two pedal push rods 901 are respectively hinged to one end of the horizontally arranged swing rod 903, and the bottom ends of the pedal push rods 901 are respectively fixedly connected to the corresponding soft pedal 501 and the sound-changing pedal 502. The shaft bracket 902 is installed on the piano shell, the middle part of the swing rod 903 is hinged on the shaft bracket 902, and the swing rod 903 is controlled to push the keyboard bracket 7 to move leftwards or rightwards integrally when swinging by stepping on the soft pedal 501 or the tone changing pedal 502, so that the hammer striking material I201 or the hammer striking material II 202 on the hammer 2 strikes the string 4, and the tone or the volume of the string 4 is changed.

The embodiment is described by taking the mute pedal 501 as an example on the left side of the sound changing pedal 502, but does not mean that the mute pedal 501 is only arranged on the left side of the sound changing pedal 502. The same function can be achieved by changing the structure of the pedestal 902 when the tuning pedal 502 is in different positions.

As shown in fig. 10 and 11, in the embodiment, the front surface of the shaft bracket 902 is T-shaped, a bottom through slot 9022 is formed in the lower portion of the shaft bracket 902, the shaft bracket 902 is n-shaped when viewed from the side, a top through hole 9021 is formed in the top of the shaft bracket 902, and the top through hole 9021 is communicated with the bottom through slot 9022 and is used for accommodating the swing rod 903.

As shown in fig. 12, a swing rod 903 is hinged to a shaft bracket 902 through a pin 904, the front surface of the swing rod 903 is inverted T-shaped, the swing rod 903 includes a cross rod 9031 and a vertical rod 9032, the vertical rod 9032 is vertically fixed to the middle of the cross rod 9031, and the cross rod 9031 and the vertical rod 9032 are integrated. Preferably, the horizontal bar 9031 is plate-shaped, and the vertical bar 9032 is cylindrical. The cross rod 9031 of the swing rod 903 is horizontally arranged in the through groove 9022 at the bottom, and the top end of the vertical rod 9032 extends out of the through hole 9021 at the top and extends into the keyboard rack 7. In order to facilitate the vertical rod 9032 to swing left and right in the top through hole 9021, the inner diameter of the top through hole 9021 is larger than the outer diameter of the vertical rod 9032, and as an optimal design, the top through hole 9021 may be oval. As a further preferable design, a swing rod ball 9033 is further arranged at the top end of the vertical rod 9032. The diameter of the swing rod ball 9033 is larger than that of the vertical rod 9032, so that the swing rod ball 9033 and the vertical rod 9032 can be fixed or can be in a threaded or other detachable connection mode according to specific requirements in order to facilitate assembly and later maintenance.

A compression spring 905 for resetting the oscillating bar 903 is arranged between the cross bar 9031 and the shaft bracket 902, the compression springs 905 are symmetrically arranged, one end of each compression spring 905 is fixedly connected with one of the cross bar 9031 and the shaft bracket 902, and the other end of each compression spring 905 is abutted against the shaft bracket 902 or the cross bar 9031. In this embodiment, the lower end of the compression spring 905 is fixed to the cross bar 9031, and the upper end of the compression spring 905 completely abuts against the pedestal 902.

As a preferable design, a top rod sleeve 906 is hinged to the lower surface of the cross rod 9031 in a bilateral symmetry manner, the top rod sleeve 906 is used in cooperation with the top end of the corresponding pedal top rod 901, and the bottom end of the top rod sleeve 906 is provided with an open hollow cavity. The front ends of the soft pedal 501 and the sound changing pedal 502 are treading parts, the rear ends of the soft pedal 501 and the sound changing pedal 502 are fixed with the corresponding pedal mandril 901, and the top end of each pedal mandril 901 extends into the corresponding mandril sleeve 906. Because the soft pedal 501 and the tuning pedal 502 share one swing rod 903, in order to prevent the soft pedal 501 or the tuning pedal 502 from interfering with each other when being excited, in this embodiment, a stroke space for the movement of the pedal push rod 901 is reserved in each push rod sleeve 906, that is, when the soft pedal 501 is in an excited state, the pedal push rod 901 connected with the soft pedal 501 jacks up the swing rod 903 connected with the pedal push rod 901, and at this time, the tuning pedal 502 is in a standby state, and a certain space is reserved between the top end of the pedal push rod 901 connected with the tuning pedal 502 and the top wall of the corresponding push rod sleeve 906, so that the soft pedal 501 or the tuning pedal 502 cannot interfere with each other. The same applies to the case where the sound-changing pedal 502 is in the activated state and the soft pedal 501 is in the deactivated state. Preferably, the outer diameter of the pedal mandril 901 and the inner diameter of the mandril sleeve 906 can adopt clearance fit.

The working process is as follows:

as shown in fig. 13, when the player steps on the soft pedal 501, the soft pedal 501 is in an excited state, the soft pedal 501 pushes up the pedal jack 901 connected thereto, the pendulum 903 swings to the right, and pushes the keyboard holder 7 to move to the right side, and the keyboard holder stops after contacting with the key side wood 8 on the right side, and the moving distance is the same as the distance between two adjacent strings 4 in the same tone string group. At this time, the hammer 2 strikes the two strings 4 simultaneously, and only the hammer striking material one 201 on the hammer 2 is in contact with the string 4. When the player releases the mute pedal 501, the mute pedal 501 is in a standby state, the swing link 903 swings left to restore the original state under the action of the compression spring 905, and pushes the keyboard rack 7 to move left, so that the keyboard rack 7 restores to the original position.

In the same manner as shown in fig. 14, when the player steps on the shift pedal 502, the shift pedal 502 is in an excited state, the shift pedal 502 pushes up the pedal jack 901 connected thereto, the swing link 903 swings left, and pushes the keyboard holder 7 to move to the left side, and the shift is stopped after contacting the key side wood 8 on the left side, and the distance of movement is half of the distance between two adjacent strings 4 in the same tone string group. At this time, the hammer 2 strikes three strings 4 at the same time, and only the hammer striking material two 202 on the hammer 2 comes into contact with the strings 4, making a sound of a different timbre from that of the hammer striking material one 201. When the player releases the shift pedal 502, the shift pedal 502 is in a standby state, and the swing link 903 swings rightwards under the action of the compression spring 905 to restore the original state and pushes the keyboard rack 7 to move rightwards, so that the keyboard rack 7 is restored to the original position.

The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A hammer, comprising: a mallet wood last (203) and a mallet striking material arranged at one end of the mallet wood last (203) for striking the strings (4), characterized in that: the hammering material comprises a first hammering material (201) and a second hammering material (202) with different hardness, the first hammering material (201) and the second hammering material (202) are arranged alternately, and the second hammering material (202) is made of a material with hardness greater than or less than that of the first hammering material (201).

2. A hammer as claimed in claim 1, wherein: the first hammering material (201) is made of wool felt.

3. The hammer processing method of claim 1, wherein the hammer (2) is composed of a hammer wood last (203) and a hammer striking material, and the hammer striking material is arranged on the striking surface of the hammer wood last (203), and the method comprises the following steps:

step 1: the hammering material comprises a first hammering material (201) and a second hammering material (202) which are alternately arranged, and every two adjacent first hammering materials (201) and second hammering materials (202) are fixedly connected with each other in an adhesion mode;

step 2: fixing the first hammering material (201) and the second hammering material (202) which are fixed into a whole on one side of the hammering surface of the hammering wood last (203) in an adhering mode.

4. The process of claim 3 wherein: further comprising the step 3: and positioning and mounting holes (204) for mounting the hammer shank (206) are further processed on the hammer wood last (203), and the number of the positioning and mounting holes (204) is at least two.

5. Use of the hammer according to claim 1 in a string-striking machine (1) for connecting a hammer (2) to a key (3), the hammer (2) being mounted on one side of the machine (1) by means of a hammer shank (206), the key (3) being mounted on the other side of the machine (1), characterized in that: when the string (4) is struck by the hammer striking material II (202) on the hammer (2), the timbre different from the vibration frequency of the hammer striking material I (201) can be given out.

6. The use of claim 5, wherein: different positioning mounting holes (204) are formed in the hammer wooden last (203), and the hammer handle (206) enables different hammer striking materials on the hammer (2) to strike the strings (4) according to different positions of the positioning mounting holes (204).

7. A piano with fourth pedal, comprising: a string striking machine (1), a hammer (2), keys (3), strings (4), a pedal system (5) and a transmission connecting rod assembly (9),

the string-striking machine (1) is used for connecting the hammer (2) and the keys (3), and the hammer (2) is driven to strike the strings (4) by jacking the string-striking machine (1) through the keys (3);

the strings (4) are arranged above the corresponding hammers (2), and each hammer (2) corresponds to a group of homonymous string groups;

the pedal system (5) comprises a mute pedal (501), a selective sound-delaying pedal (503) and a sound-delaying pedal (504), wherein the mute pedal (501) is connected with the transmission connecting rod assembly (9);

characterized in that the action (1) uses the action of claim 5, and the pedal system (5) further comprises a fourth pedal, the fourth pedal is a tuning pedal (502), the tuning pedal (502) is connected with the transmission connecting rod assembly (9) and is used for driving the hammer (2) to displace, when the key (3) is pressed, the hammer striking material II (202) on the hammer (2) strikes the string (4) and produces a timbre different from the vibration frequency of the hammer striking material I (201).

8. The piano of claim 7, wherein: when the tuning pedal (502) is in the excited state, the number of strings (4) struck by the hammers (2) is the same as the number of strings (4) in the corresponding homophonic string group.

9. The piano of claim 8, wherein: the transmission connecting rod assembly (9) comprises a pedal ejector rod (901), a shaft bracket (902) and an oscillating rod (903), the shaft bracket (902) is installed on a piano shell, the oscillating rod (903) is horizontally hinged to the shaft bracket (902), a soft pedal (501) and a pitch changing pedal (502) are respectively hinged to two sides of the oscillating rod (903) through the pedal ejector rod (901), and the soft sound effect or the pitch changing effect of the string (4) knocked by the hammer (2) is achieved by controlling the left-right swinging of the oscillating rod (903).

10. The piano of claims 7 to 9, wherein: the first hammer-striking materials (201) and the second hammer-striking materials (202) which are alternately arranged are three layers.

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