JP4464147B2 - Grand piano action - Google Patents

Description

  The present invention relates to an action of a grand piano in which a hammer is turned to strike a string.

  Conventionally, as shown in FIG. 1, a hammer for striking a string is located below the horizontally stretched string, and this hammer is pushed up from the bottom and rotated to perform the string striking action. 1 is known. Since the entire configuration of the conventional example and the present invention is the same, the conventional configuration and the entire configuration of the present invention will be described with reference to FIG.

  The action 1 is supported by a whippen rail 14 via a whippen frenzy 13 so as to be pivotable. The whippen 15 pivots upward when the capstan screw 12 is raised, and a long hole (hereinafter referred to as “jack guide”). Hammer 2 with a hammer head 23 attached to the tip of the hammer shank 22 and the repetition lever 16 rotatably supported at the tip of the support 15a above the tip of the whippen 15 Etc.

  Further, the upper end of the shaft 18a extending in the vertical direction of the jack 18 is inserted into the jack guide hole 16a of the repetition lever 16 and is opposed to the shank roller 19 with a minute interval.

  In action 1, when the performer presses the key, the whippen 15 is pushed up, the repetition lever 16 and the jack 18 rotate upward together with the whippen 15, and the jack 18 moves the shank roller 19 at the upper end along with this rotation. The hammer shank 22 is pushed upward, and the hammer shank 22 is rotated upward to strike the string 25 with the hammer head 23.

  By the way, the action 1 of the grand piano operates sensitively in accordance with the player's key pressing operation, and requires a stable continuous hit performance and the action of the action 1 is transmitted to the player's finger, and a touch feeling peculiar to the grand piano. Is required.

Therefore, there is a grand piano action 1 in which the repetition lever 16 has an H-shaped cross-section in a horizontal direction and the weight is reduced while maintaining strength. In some cases, the cross section is made smaller as the repetition lever 16 moves away from the center pin hole 15c engaged with the support column 15a to reduce the weight, and to make the player's response to the key pressing operation sensitive. (For example, see Patent Document 1)
JP-A-9-281959 (page 2-3, Fig. 1-3)

  However, according to the action disclosed in Patent Document 1, the shape of the repetition lever 16 is improved, but the cross section perpendicular to the direction of the shaft 18a of the jack 18 is the length direction of the hammer shank 22 (in the drawing). (L direction) is formed in substantially the same shape, the efficiency of transmitting force from the jack 18 to the shank roller 19 is poor, and there is room for further improvement in weight reduction and continuous hitting performance.

  The present invention has been made in view of these problems, and an object of the present invention is to reduce the weight and improve the performance of repeated hits in the action of a grand piano.

  In order to achieve this object, the invention according to claim 1 is characterized in that a hammer head is provided at the tip of the shaft, a shank roller is provided at the lower surface of the shaft, and the rear end of the shaft is supported so as to be the center of rotation. A hammer shank that pivots in a direction, and a jack disposed below the hammer shank so that the axial direction is substantially perpendicular to the axial direction of the hammer shank, the axial upper end surface of the jack Is an action of a grand piano that pushes up the shank roller, rotates the hammer shank, and hits a string with the hammer head, and the jack has a cross section perpendicular to the axial direction of the jack of the hammer shank. It is characterized by being formed so as to increase toward the hammer head side along the axial direction.

  According to the action of the grand piano as set forth in claim 1, since the jack is formed such that the cross section perpendicular to the axial direction is larger on the hammer head side along the axial direction of the hammer shank, The force with which the jack pushes up the shank roller is easily transmitted to the hammer head side, the force for rotating the hammer is not dispersed, the continuous hitting performance can be improved, and the weight of the jack can be reduced.

  In addition, the operation in which the upper end surface of the jack in the axial direction pushes up the shank roller and the operation of moving away from the shank roller along with the key pressing operation are easily transmitted to the tip of the playing side of the key. A feeling can be improved.

  By the way, in the action of the grand piano according to claim 1, the jack may be formed so that the cross section perpendicular to the axial direction of the jack is formed so that the hammer head side becomes larger along the axial direction of the hammer shank. As a preferred shape, a cross section perpendicular to the axial direction of the jack is formed in an H shape in which both side walls facing each other along the axial direction of the hammer shank are connected by ribs, as described in claim 2. As for the wall thickness of both side walls, it is desirable that one side closer to the hammer head side is formed to be larger than the other side facing it.

  Therefore, according to the action of such a grand piano, the force for rotating the hammer is concentrated and transmitted to the side wall on the hammer side in the H-shaped section in accordance with the key pressing operation. It can be improved, and the weight can be reduced efficiently without impairing the rigidity of the jack.

  Further, in the action of the grand piano according to claim 2, the thickness of both side walls of the jack is the largest in the vicinity of the central portion in the axial direction of the jack, and both ends in the axial direction of the jack are as described in claim 3. It is preferably formed so as to become smaller toward the part side.

  In other words, when the jack pushes up the shank roller, the thickness of both side walls near the axial center of the jack is a position where a large force is applied to the jack, and as it approaches both ends where a large force is not applied, The wall thickness on both sides is reduced. With this configuration, it is possible to prevent a large stress from acting on both side walls of the jack, so that the strength of the jack can be maintained.

Moreover, since the thickness of both side walls can be reduced and the weight can be reduced, the continuous hitting performance can be improved.
Furthermore, in the action of the grand piano according to claim 2 or 3, the jack is configured so that the width of the rib in the cross section extends along the axial length of the hammer shank as in claim 4. It is preferably formed so as to increase toward the head side.

  According to the action of such a grand piano, the operation of pushing up the shank roller and the operation of moving away from the shank roller with the key pressing operation are more easily transmitted to the tip of the playing side of the key. Can be improved.

  Moreover, in the action of the grand piano according to any one of claims 1 to 4, as described in claim 5, the action is formed so as to protrude from the jack in a direction substantially orthogonal to the axial direction of the jack. When the jack tail has a jack tail that abuts against the movement preventing member and swings the jack when the jack pushes up the hammer shank, the jack tail has a cross section perpendicular to the axial direction of the jack tail. It is formed in an H shape in which both side walls facing each other along the axial direction are connected by ribs, and the wall thickness of both side walls is formed so that one near the movement blocking member is larger than the other facing the wall. preferable.

  That is, when the jack tail abuts against the movement blocking member, an external force is applied to the jack tail, and a larger external force is applied to the side wall near the movement blocking member than to the side wall far from the movement blocking member. The wall thickness near the wall is set large. With this configuration, it is possible to prevent a large stress from acting on both side walls of the jacktail.

Therefore, according to the action of such a grand piano, the jacktail can be reduced in weight and the strength can be maintained.
Furthermore, in the action of the grand piano according to claim 5, the wall thickness of both side walls of the jack tail is the largest near the axial center of the jack tail as in claim 6, and the axial direction of the jack tail It is preferably formed so as to become smaller toward both end portions.

According to the action of such a grand piano, the strength of the jack tail can be maintained and the weight can be reduced efficiently, so that the continuous hitting performance can be improved.
Further, in the action of the grand piano according to claim 6, as described in claim 7, at the tip of the jack tail, there is a contact portion that contacts the movement preventing member, and the width of both side walls in the jack tail Is preferably formed so as to become smaller from the jack side of the jack tail toward the connecting portion of the contact portion.

  According to the action of such a grand piano, the jack tail is configured to become thinner and lighter as it approaches the abutting portion from the jack side, so that the inertia force when the jack swings is effectively reduced. It is possible to improve the hitting performance.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing the overall configuration of an action in the embodiment to which the present invention is applied, and FIG. 2 is a side view showing the appearance of a jack in the action of the embodiment and a cross-sectional view along AA in the figure. is there.

  As shown in FIG. 1, the action 1 is provided with a hammer head 23 at the tip of the shaft and a shank roller 19 via a shank rough range 19a on the lower surface of the shaft so that the rear end 22a is the center of rotation. A hammer shank 22 supported by the shank flange 20 and rotated in the vertical direction, and a jack 18 disposed below the hammer shank 22 so that the axial direction is substantially perpendicular to the axial direction of the hammer shank 22. The shank roller 19 is pushed up by the upper end surface of the jack 18 in the axis 18a direction, the hammer shank 22 is rotated, and the string 25 is hit by the hammer head 23.

  The action 1 is supported by the whippen rail 14 through the capstan screw 12 that rises when the key 11 is pressed and the whippen flange 13 so as to be rotatable, and rotates upward by the capstan screw 12 ascending. The repetition lever 16 which has a long hole (hereinafter referred to as “jack guide hole”) 16a at the tip of the wippen 15 and is rotatably supported at the tip of the column 15a above the wippen 15 by the lift of the wippen 15. And an upper end portion (hereinafter referred to as “hammer push-up portion”) is located inside the jack guide hole 16a of the repetition lever 16 and is formed at the tip end of the jack tail 18b. The regulated abutting portion 18c is formed by the regulating button 17 (in the present invention). The jack 18 that rises together with the whippen 15 until it abuts against the movement-preventing member) and the shank roller 19 that abuts against the upper surface of the repetition lever 16 and separates from the upper surface of the repetition lever 16 when pushed up to the hammer push-up portion of the jack 18. And a hammer shank 22 that is pivotally supported by the shank rail 21 via the shank flange 20 and pivots upward when the shank roller 19 is pushed up, and a hammer head 23 attached to the tip of the hammer shank 22. ing.

  In the action 1 having the above-described configuration, when the key 11 is pressed by the performer, the whippen 15 is pushed up through the capstan screw 12, so that the repetition lever 16 and the jack 18 rotate together with the whippen 15. Move. Along with these rotations, the repetition lever 16 first pushes up the hammer shank 22 while sliding the shank roller 19 to rotate upward. Next, when the repetition lever 16 is engaged with the repetition screw 20a and the upward movement is stopped, the hammer push-up portion of the jack 18 pushes up the shank roller 19 as the jack 18 moves upward. When the key 11 is continuously depressed, the regulating contact portion of the jack 18 is reached when the hammer head 23 attached to the tip of the hammer shank 22 rotates until just before striking the string 25 stretched upward. By engaging 18 c with the regulating button 17, the hammer push-up portion is detached from the lower surface of the shank roller 19. Then, the hammer shank 22 and the hammer head 23 are disconnected from the key 11 and rotated by their own inertia to strike the string 25.

  Further, when the key 11 is released after being depressed as described above, the repetition lever 16 starts to operate at the timing when the key 11 is returned to about 1/3 of the keyboard depth. The lever 16 is returned and rotated (rotated counterclockwise in the drawing) by the spring force of the repetition spring 15b, thereby pushing up the shank roller 19 while sliding. As a result, the jack 18 is returned and rotated (rotated counterclockwise in the figure) by the spring force of the repetition spring 15b, and the hammer push-up portion moves below the shank roller 19, so that the key 11 does not return completely. Will be able to hit the next string. In this state, it is possible to perform a playing method of hitting keys continuously like a trill.

  Next, the cross-sectional shape of the jack 18 in the action 1 will be described with reference to FIG. 2A is a side view of the jack 18, and FIG. 2B is a cross-sectional view taken along the line AA perpendicular to the length direction of the shaft 18a in FIG.

  As shown in FIG. 2, the jack 18 in the action 1 has both side walls whose cross sections perpendicular to the direction of the axis 18 a (Y direction in the figure) are opposed to each other along the axial direction (L direction in the figure) of the hammer shank 22. It is formed in an H shape in which 18f and 18g are connected by a rib 18h.

Further, the jack 18 is formed such that the thickness of the side wall 18f (W1 in the figure) located on the hammer head 23 side is larger than the thickness of the opposing side wall 18g (W2 in the figure).
Further, the jack 18 has a hammer head 23 at a position where the upper end surface 18e abuts against the shank roller 19 so that the central axis X is along the axial direction (L direction in the figure) of the hammer shank 22 with respect to the shank roller 19. It is comprised so that it may decenter on the opposite side (right side in a figure). And the jack 18 is comprised so that the side wall 18f side in the upper end surface 18e of the jack 18 may contact | abut to the shank roller 19, and may push up the shank roller 19 with key pressing operation | movement.

Below, the effect of the action of Embodiment 1 which has the said structure is described.
According to the action 1 of the embodiment, the cross section of the jack 18 is large along the axial direction (L direction in the drawing) of the hammer shank 22 on the hammer head 23 side (left side in FIG. 2). 2 (the right side in FIG. 2) is made smaller so that the force by which the jack 18 pushes up the shank roller 19 along with the key-pressing operation is concentrated and transmitted to the hammer head 23 side. The force for rotating the is not dispersed and the continuous hitting performance can be improved.

  Further, according to the action 1 of the embodiment, both side walls 18f and 18g in which the cross section orthogonal to the axis 18a direction of the jack 18 (the AA cross section in FIG. 2) is opposed to each other along the axial direction of the hammer shank 22. Since the wall thickness W1 of the side wall 18f close to the hammer head 23 is larger than the wall thickness W2 of the opposite side wall 18g, it is accompanied by a key pressing operation. Thus, the force for rotating the hammer is concentrated and transmitted to the side wall 18f of the jack 18 on the hammer head 23 side, so that the continuous hitting performance can be improved and the jack 18 can be efficiently reduced in weight without impairing the rigidity. Can be

  Further, according to the action 1 of the embodiment, the operation of the key 11 is performed by the operation in which the upper end surface 18e of the jack 18 in the direction of the shaft 18a pushes up the shank roller 19 and the operation of moving away from the shank roller 19 with the key pressing operation. It is easy to be transmitted to the side tip, and the touch feeling of the performer can be improved.

(Modification)
Next, a modification of the action 1 of the present invention will be described with reference to FIG. In the modification described below, since only the shape of the jack 18 in the action 1 is different, only the jack 18 will be described. 3A and 3B are cross-sectional views showing modifications of the AA cross-sectional view of the jack 18 shown in FIG.

  The cross section of the jack 18 shown in FIG. 3A is formed in an H shape in which both side walls 18f and 18g facing each other along the axial direction (L direction) of the hammer shank 22 are connected by ribs 18h. . Further, the rib 18h has a width (t1 in the figure) connected to the side wall 18f located on the hammer head 23 side larger than a width (t2 in the figure) connected to the side wall 18g opposed to the side wall 18f. The taper is formed so that the width gradually increases from the side wall 18g toward the side wall 18f. Further, the thickness W3 of the side wall 18f and the thickness W4 of the side wall 18g are formed similarly.

  Next, the cross section of the jack 18 shown in FIG. 3 (b) has a substantially H-shape in which both side walls 18f and 18g facing each other along the axial direction (L direction) of the hammer shank 22 are connected by ribs 18h. Is formed. Further, the cross section of the jack 18 is such that the wall thickness (W5 in the drawing) of the side wall 18f located on the H-shaped hammerhead 23 side along the axial direction (L direction in the drawing) of the hammer shank 22 is It is formed larger than the wall thickness (W6 in the figure) of the opposing side wall 18g. The rib 18h is formed in an arc shape so that the width (t3 in the drawing) connected to the side wall 18f is larger than the width connected to the side wall 18g, and gradually decreases from the side wall 18f toward the side wall 18g. The connecting portion between the rib 18h and the side wall 18g is formed with an R.

  According to the cross section of the jack 18 shown in FIG. 3A of the modified example, the width of the rib 18h is tapered so as to gradually increase from the side wall 18g toward the side wall 18f. In the same manner as described above, the force by which the jack 18 pushes the shank roller 19 along with the key pressing operation is easily transmitted to the hammer head 23 side, and the force for rotating the hammer 2 is not dispersed and the continuous hitting performance is improved. Can do.

  Further, according to the cross section of the jack 18 shown in FIG. 3B of the modified example, the side wall located on the side of the H-shaped hammer head 23 along the axial direction (L direction in the drawing) of the hammer shank 22. The thickness of 18f (W5 in the figure) is formed larger than the thickness (W6 in the figure) of the opposing side wall 18g, and the rib 18h has a width (t3 in the figure) connected to the side wall 18f. Since it is formed in an arc shape so that it is larger than the width connected to 18g and gradually decreases from the side wall 18f toward the side wall 18g, the connecting portion between the rib 18h and the side wall 18g is formed with R. Further, local stress concentration at the connecting portion between the rib 18h and the side walls 18f and 18g can be reduced, damage to the jack 18 can be suppressed, and durability can be improved.

  According to the embodiment of the present invention, as shown in FIG. 2, the cross section of the jack 18 is formed in an H shape, but without being limited to this, the direction of the axis 18 a of the jack 18 (in the drawing) The cross section perpendicular to the Y direction) is along the axial direction (L direction in the figure) of the hammer shank 22, the hammer head 23 side (left side in the figure) is large, and the opposite side (left side in the figure) is What is necessary is just to form so that it may become small.

Further, according to the embodiment of the present invention, as shown in FIG. 2, the upper end surface 18e of the jack 18 is flat. However, the jack 18 may be uneven or may be provided with a rounded corner.
Further, the cross section of the jack 18 may be further changed along the axial direction of the shaft 18a (Y direction in FIG. 2).

  Further, the jack 18 in the action 1 may be a jack 18 having a shape as shown in FIG. 4A is a side view of the jack 18, and FIG. 4B is a bottom view of the jack 18 mainly showing the jack tail 18b.

  As shown in FIG. 4A, the wall thicknesses e (or e ′) in the vicinity of the central portion of the jack 18 in the axial direction are the largest. It is set to become smaller as it gets closer. That is, the thicknesses d and f (or d ′, f ′) in the vicinity of both axial ends of the jack 18 and the thickness e (or e ′) in the vicinity of the central portion of the jack 18 in the axial direction are e> d, f The relationship (e ′> d ′, f ′) is established. Further, the side walls 18f and 18g of the jack 18 are set such that the side wall 18f closer to the hammer head is thicker than the other side wall 18g in an arbitrary cross section perpendicular to the axial direction of the jack 18. Yes. That is, the relationship of e ′> e, d ′> d, and f ′> f is established.

  Therefore, when the jack 18 pushes up the shank roller 19, it is possible to prevent a large stress from acting on the side walls 18 f and 18 g of the jack 18, so that the strength of the jack 18 can be maintained.

Further, since the thickness of the side walls 18f and 18g can be reduced and the jack 18 can be reduced in weight, the continuous hitting performance can be improved.
Also in the jack tail 18b, as in the jack 18, the wall thickness of the side walls 18i, 18j of the jack tail 18b is as shown in FIG. 4 (a) in the vicinity of the central portion in the axial direction of the jack tail 18b. h (or h ′) is the largest, and is set to become smaller as it approaches the both ends of the jack tail 18b. That is, the thicknesses g and i (or g ′, i ′) in the vicinity of both ends in the axial direction of the jack tail 18b and the thickness h (or h ′) in the vicinity of the central portion in the axial direction of the jack tail 18b are h> g. , I (h ′> g ′, i ′). Further, the side walls 18i and 18j of the jack tail 18b are set so that the side wall 18i closer to the hammer head is thicker than the other side wall 18j in an arbitrary cross section perpendicular to the axial direction of the jack tail 18b. Has been. That is, the relationship of h ′> h, g ′> g, i ′> i is established.

  Therefore, when the jack tail 18b contacts the regulating button 17, it is possible to prevent a large stress from acting on both side walls of the jack tail 18b, so that the jack tail 18b can be reduced in weight and strength. Can be maintained.

  Further, as shown in FIG. 4B, the width of the jack tail 18b is set to be the largest at the portion close to the rotation center of the jack 18, and the width of the jack tail 18b is adjusted to the regulating contact portion 18c that contacts the regulating button 17. It is configured to become thinner gradually as it approaches. That is, the relationship of a> b is established.

In the present specification (including claims), the width of the jack tail 18b indicates the length in the left-right direction when the action 1 is viewed from the front side or the rear side.
Therefore, since the jack tail 18b is configured to become thinner and lighter as it approaches the regulating contact portion 18c from the jack 18 side, the inertial force when the jack 18 swings can be effectively reduced. It is possible to improve the hitting performance.

  Further, the width c of the regulating contact portion 18c is set large so that the relationship of c> b is established. For this reason, it is possible to prevent an excessive impact from being applied to the regulating contact portion 18c and the regulating button 17, and further damage to the action 1 can be prevented.

It is a side view showing the whole structure of the action of a grand piano in this invention and a prior art example. It is the side view (a) showing the external appearance of the jack in the action of the grand piano to which this invention was applied, and AA sectional drawing (b) in the figure. It is sectional drawing of the jack of the modification to which this invention was applied. It is sectional drawing of the jack of the modification to which this invention was applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Action, 2 ... Hammer, 11 ... Key, 12 ... Capstan screw, 13 ... Whippen frenzy, 14 ... Whippen rail, 15 ... Whippen, 15a ... Post, 15b ... Repetition spring, 15c ... Center pin hole, 16 ... Repetition lever, 16a ... jack guide hole, 17 ... regulating button, 18 ... jack, 18a ... shaft, 18b ... jack tail, 18c ... regulating contact, 18e ... upper end surface, 18f ... side wall, 18g ... Side wall, 18h ... rib, 19 ... Shank roller, 19a ... Shankro rough range, 20 ... Shank frenzy, 21 ... Shank rail, 22 ... Hammer shank, 22a ... Rear end, 23 ... Hammer head, 25 ... String.

Claims (7)

A hammer shank provided with a hammer head at the tip of the shaft and a shank roller on the lower surface of the shaft, supported so that the rear end of the shaft serves as a rotation center, and rotated up and down;
A jack disposed below the hammer shank so that an axial direction thereof is substantially perpendicular to an axial direction of the hammer shank, and the shank roller is pushed up by an upper end surface of the jack in the axial direction; An action of a grand piano that rotates a shank and strikes a string with the hammer head,
The action of a grand piano, wherein the jack is formed such that a cross section perpendicular to the axial direction of the jack increases toward the hammer head along the axial direction of the hammer shank.   The jack is formed in an H shape in which a cross section perpendicular to the axial direction of the jack is formed by connecting ribs on both side walls facing each other along the axial direction of the hammer shank. The action of the grand piano according to claim 1, wherein one closer to the side is formed larger than the other opposite to the other.   The wall thickness of both sides of the jack is formed so as to be the largest in the vicinity of the central portion in the axial direction of the jack and to become smaller toward both end portions in the axial direction of the jack. The action of the described grand piano.   The said jack is formed so that the width | variety of the said rib in the said cross section may become large toward the said hammer head side along the axial direction of the said hammer shank. Grand piano action. A jack that protrudes from the jack in a direction substantially orthogonal to the axial direction of the jack, and abuts against a movement preventing member when the jack pushes up the hammer shank, and swings the jack With a tail,
The jack tail is formed in an H shape in which a cross section perpendicular to the axial direction of the jack tail is formed by connecting ribs on both side walls facing each other along the axial direction of the jack. The action of the grand piano according to any one of claims 1 to 4, wherein one close to the blocking member is formed larger than the other facing the blocking member.   The wall thickness of both side walls of the jack tail is formed so that the vicinity of the central portion in the axial direction of the jack tail is the largest and decreases toward both end portions in the axial direction of the jack tail. Item 5. The grand piano action according to item 5. At the tip of the jack tail, there is an abutting portion that abuts against the movement preventing member,
The ground according to claim 5 or 6, wherein widths of both side walls of the jack tail are formed so as to become smaller from a jack side of the jack tail toward a connection portion of the abutting portion. Piano action.

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