JP3864316B1 - Cap member for piano capstan and capstan using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for improving the function and handleability of a capstan screw (capstan button).
A cap-like member attached to a capstan of a piano for driving an action in response to pressing of a keyboard, wherein the cap member covers a curved surface existing on an upper end side of the capstan. And a top surface formed on a gently curved surface, and the curvature of the top surface of the cap member is different from the curvature of the top surface of the capstan on which the cap member is mounted. A stun cap member is provided.
[Selection] Figure 3

Description

  The present invention relates to a component usable for an action mechanism of a piano, and more particularly, to a cap member for capstan, a capstan using the cap member, a small piece member attached to (attached to) a Wipen heel cross, and a shank roller. The present invention relates to a replacement member to be installed, a capstan adjustment method, and a piano repair / adjustment method.

Conventionally, it has been known that the action mechanism of a piano requires adjustment and repair for many years of use. In other words, since the action mechanism of the piano rotates the hammer based on the operation at the time of key depression, contact and collision between members occur in the process of transmitting the power at the time of key depression, thereby The contact or collision area may be recessed.
In such a case, the actual situation is that the conventional piano adjustment or repair method is dealt with by replacing worn parts.
For example, when repairing the action mechanism of a piano, it may be necessary to replace the wipen heel cloth that contacts the capstan when the key is pressed. That is, as is well known, the piano capstan is provided on the upper surface of the rear part of each keyboard, and by driving the mounted action by pushing it up when the key is pressed, the hammer is rotated and the string is struck. It is.

  In order to clarify the structure of such a capstan, first, the structure of a conventional piano is shown first. For example, in the case of a grand piano, as shown in FIG. When the keyboard 105 is pressed, the capstan screw 12 is lifted about the balance pin 107 as a fulcrum, and is supported rotatably by the Wipen rail 114 via the Wipen flange 113. When the capstan screw 12 is raised, the capstan screw 12 is turned upward. A moving Wipen 115, a jack 117 that is pivotally connected to the Wipen 115 and rises with the Wipen 115 until it contacts the regulating button 116, and a shank roller 118 that contacts the jack 117 and separates when pushed up by the jack 117. And the shank through the shank frenzy 119 A hammer shank 121 that is pivotally supported by the clair 120 and pivots upward when the shank roller 118 is pushed up, and is attached to the tip of the hammer shank 121. And a hammer 123 for hitting.

  When the distance between the keyboard and the action is relatively small as shown in FIG. 14 (such as a grand piano), the capstan 12 has a screw portion that hangs downward below a predetermined position on the rear surface of the keyboard 105. When the distance between the keyboard and the action is relatively large (upright piano, etc.), as shown in FIG. A post wire 152 protruding from the top of the post wire 152 is provided, and the capstan button 12 is screwed into the upper end of the post wire 152. In FIG. 15, members having the same functions as those in FIG. 14 are denoted by the same reference numerals, and description of the structure is omitted.

  The capstan screw is usually made of brass, and the capstan button is usually made of synthetic resin or wood. If it is left as it is, the capstan screw does not slide with the wipen 115, and the head that is in contact with the wipen is damaged. Noise will be generated due to the attachment. Therefore, conventionally, a portion of the wipen 115 that comes into contact with the head of the capstan screw or capstan button (hereinafter referred to as capstan) 12 has improved sliding with the capstan head, and noise is generated. In order to suppress it, a wipen heel cloth 150 made of a cloth such as felt or cloth is provided.

  Patent Document 1 (Japanese Patent Laid-Open No. 08-328547) proposes nickel plating containing a fluororesin on the surface of the capstan. The capstan formed in this way is covered with a coating layer on the entire surface, is excellent in sliding with the wipen, and has no risk of scratching the upper surface of the head over a long period of time.

  Furthermore, when replacing the capstan, first the action provided on the capstan must be removed, the capstan must be removed by hand, and a new capstan must be attached by hand. Both work volume and work time are enormous.

Patent Document 2 (Japanese Patent Laid-Open No. 08-292759) is a prior art that improves the operability in the up-and-down operation such as the height adjustment work of the capstan. At the same time, the technique described in this document simply increases the number of operation holes for inserting and rotating the capstan rotation from the conventional four to eight. However, it still has to be removed and attached one by one by hand.
Japanese Patent Laid-Open No. 08-328547 JP 08-292759 A

  The above capstan conveys the action at the time of key depression to the action, and its structure is important to directly influence the feeling at the time of key depression. At the same time, in the past, only the improvement of the slipperiness of the capstan has been studied, and no means has been studied for means for improving its function and handleability. .

  Accordingly, an object of the present invention is to provide a member for further improving the function and handleability of the capstan screw (capstan button) after recognizing the importance of the function.

  In addition, the capstan has a gently curved upper surface (the part that abuts against the Wipen heel cross), and the part of the pen that comes in contact with the capstan head improves sliding and generates noise. There is provided a wipen heel cloth made of a fabric for suppressing the above. In such a configuration, the Wipen heel cross may be depressed by contact with the capstan head due to long-term use, and as a result, it may be caught and change the feel when pressing the key. There is sex.

  Therefore, this invention makes it a subject to provide the member for preventing the change of the touch at the time of key depression by use for many years by a simple method.

  It is another object of the present invention to provide a method for adjusting a piano capstan that can change at least one of the curvature, size, sliding condition, and orientation of the piano capstan by a simple method. .

In addition, the present invention reduces the occurrence of depressions in the Wipen heel cross due to contact with the capstan, and further, a member that can be easily repaired or restored even if such depressions occur. The issue is to provide.
Furthermore, the present invention provides a member and method capable of repairing not only the vicinity of the capstan but also deterioration or wear of the action mechanism in the piano by a simple method.

  In order to solve the above problems, the present invention provides a cap-like member for capstan for varying at least one of the curvature, size, and curved direction of the upper surface of a capstan of a piano.

That is, a cap-shaped member attached to a piano capstan for driving an action in response to pressing of the keyboard, the cap member including a receiving portion covering a curved surface existing on the upper end side of the capstan; A capstan cap member having at least one of the following features (1) to (6).
(1) The curvature of the upper surface of the cap member is different from the curvature of the upper surface of the capstan on which the cap member is mounted.
(2) The receiving portion of the cap member has a bottom surface portion that is recessed with the same curvature as the upper surface of the capstan on which the cap member is mounted, and the cap member has a different curvature between the upper surface curvature and the bottom surface portion. ing.
(3) The diameter of the upper surface of the cap member is different from the diameter of the upper surface of the capstan on which the cap member is mounted.
(4) The direction of the upper surface (curved surface) of the cap member is different from the direction of the capstan upper surface (curved surface) on which the cap member is mounted.
(5) The cap member includes a receiving portion covering a curved surface existing on the upper end side of the capstan, an upper surface formed on a gently curved surface, and a peripheral wall portion that circulates along a peripheral edge of the upper surface, The peripheral wall portions have different heights along the circulation direction.
(6) The frictional resistance value with respect to the fabric on the upper surface of the cap member (including the Wipen heel cloth) is different from the frictional resistance value with respect to the same fabric on the upper surface of the capstan on which the cap member is mounted.
Since the cap member is used by being installed on the upper surface of the capstan, it is desirable to match the curvature of the receiving portion of the cap member with the curvature of the upper surface of the capstan. As long as the cap member can be installed on the upper surface, the curvature of the receiving portion of the cap member may not match the curvature of the upper surface of the capstan.

  The upper surface of the cap-shaped member has at least a region formed in a curved surface. For example, a part or all of the upper surface is formed into a spherical surface, and is formed as a curved surface (narrowly defined curved surface). can do.

  Moreover, in this invention, the capstan formed using the cap-shaped member provided with the characteristic in at least any one of said (1)-(6) as a capstan for solving the said subject is provided.

  In other words, it is a piano capstan for driving an action when a key is pressed, and a capstan body attached to the back side of the keyboard and a cap shape covering a curved surface existing on the upper end side of the capstan body A capstan for a piano using a cap member having at least one of the features (1) to (6) as the cap member.

  Furthermore, the present invention provides a method for adjusting a capstan using a cap member in order to solve the above problems.

  That is, a piano capstan adjustment method for changing at least one of the curvature, size, sliding condition, and orientation of the upper surface of a piano capstan for driving an action in response to pressing of a keyboard, A method of adjusting a capstan of a piano, comprising a step of installing a cap member formed in a cap shape with respect to the capstan.

  The upper surface (curved surface) of the capstan cap member according to the present invention is different from the upper end portion (curved surface) of the capstan to which the capstan is mounted in at least one of curvature, size, sliding condition, and orientation. Even if the entire capstan is not removed at the time of these changes as in the conventional example, the same effect as that obtained by replanting the desired capstan can be obtained by simply mounting the cap member.

  When mounting such a cap member, it is mounted on the upper surface of the capstan using an adhesive or the like, and the shape of the receiving portion for receiving the upper surface of the capstan is set on the upper surface of the capstan to which the capstan is mounted. It can also be performed by forming into a size and shape to fit.

  The cap member is desirably formed with the overall height being suppressed as much as possible. Specifically, it is desirable to make the thickness between the upper surface and the bottom surface of the receiving portion as thin as possible. In addition, when the receiving portion of the cap member has a depth enough to receive the upper end side peripheral wall of the capstan, it is desirable that the thickness of the peripheral wall portion constituting the receiving portion is made as thin as possible. By forming the cap member in this way, the mass of the cap member is suppressed, so that only a slight change in weight is allowed when the cap member is attached to the capstan, so that no change is caused in the sense of pressing the key. It becomes a cap member.

  Further, in order to solve the above-mentioned problems, the present invention provides a member that can be easily repaired when a depression has already occurred in the Wipen heel cloth due to long-term use.

  That is, it is a small piece member provided so as to follow the Wipen heel cross provided on the bottom surface of the Whippen, and the small piece member has substantially the same thickness as the depth of the depression generated in the Wipen heel cross by the operation at the time of key depression. It is a small piece member which has and is formed in the substantially same planar shape as the said hollow.

  Such a small piece member can be arranged so as to fill a hollow formed in the wipen heel cross provided on the bottom surface of the wicken, but is preferably inserted between the wipen heel cross and the wipen heel undercross. Installed. When inserted into the back side of the Wipen heel cross in this way, at least one protrusion is formed on the surface of the small piece member facing the Wipen heel undercross in order to prevent the movement of the small piece member. It is desirable to form. This protrusion can bite into the wipen heel undercloth during installation to prevent the small piece member from moving.

  By inserting the small piece member between the wipen heel cross and the wipen heel undercross, the depression of the wipen heel cross is lifted, and the deterioration due to the use can be eliminated.

  The installation of such a small piece member is a time when a depression has occurred in the Wipen heel cross due to long-term use. At the same time, the capstan cap member can be installed at the same time to avoid deterioration as much as possible. it can.

  Further, in the present invention, in order to solve the above-mentioned problem, the present invention is a compensation member installed on a shank roller that transmits the operation at the time of key depression to the hammer shank, and the compensation member is provided in a contact area with the repetition lever in the shank roller. And a compensation member formed in a size and shape that compensates for the thin portion of the shank roller that has been deformed by the operation at the time of key depression.

  The above-mentioned filling member fills a depression in the shank roller caused by contact with the repetition lever over many years of use. In addition to installing a pre-formed one, it is cured after filling the depression. (For example, putty material) may be used.

  By using the small piece member and the supplementary member according to the present invention, it is possible to repair without having to replace a member that has been deformed or worn due to long-term use, and therefore, it is easy to repair a piano (particularly an action mechanism). It becomes possible to do.

  Any of the cap member, the small piece member, and the filling member according to the present invention can be formed using various resins such as metal, resin, and ceramic, and can be formed of metal and ceramic, metal and resin, or resin and ceramic. In this way, any material can be used in combination. In particular, when the frictional resistance value in the cap member is changed, the material can be appropriately selected in relation to the frictional resistance value. Further, the small piece member and the compensation member may be formed as one having an end surface that is curved and protrudes in a lens shape, or may be formed in a plate shape that does not have such a curved surface.

  Hereinafter, based on a specific embodiment, the structure and effect of a cap member and a capstan according to the present invention, a method for adjusting a piano, and a member used therefor will be specifically described.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

[Embodiment 1]
1 is a cross-sectional perspective view showing a cap member 50 according to the present embodiment, FIG. 2 is a longitudinal cross-sectional view showing a state in which the cap member 50 shown in FIG. 1 is attached to the capstan 12, and FIGS. It is the schematic which shows the effect of the cap member 50 concerning this Embodiment.

  First, the capstan 12 to which the cap member 50 according to the present embodiment is attached will be described. The capstan 12 is positioned behind the keyboard 105 as shown in FIG. Ascending by the keyboard 105 with the fulcrum 107 as a fulcrum, the wipen 115 is rotated upward.

  The capstan 12 includes a screw foot 4 and a head 6 as shown in FIGS. 1 and 2, and the screw foot 4 is a screw thread for screwing into the back side of the keyboard 105 (see FIG. 14). Is cut off. The head 6 has a diameter slightly larger than the diameter of the screw foot 4, and the upper surface 6 a that comes into contact with the Wipen heel cross 150 (made of a cloth such as felt or cloth) of the Wipen 115 (see FIG. 14) is a gently curved surface. It is formed in the spherical surface which has. The head 6 is provided with two through holes 8 a and 8 b in a direction orthogonal to the screw foot 4, and these are orthogonal to each other. The through holes 8a and 8b are formed by inserting and rotating a rod-shaped tightening tool into one of the through holes 8a and 8b, and screwing the screw feet 4 of the capstan 12 into the back side of the keyboard 105 (see FIG. 14). It is used to make it.

  Then, the cap member 50 of the present embodiment attached to the capstan 12 covers the upper surface (spherical surface) 6a of the head 6 of the capstan 12 and has a receiving portion 51 formed in a hollow shape for receiving it, The outer peripheral wall 52 forming the side wall and the upper surface 56 formed in a gentle spherical shape from the upper end of the outer peripheral wall 52 are formed, and the receiving portion 51 therein is the head upper surface 6 a of the capstan 12. The bottom surface 53 is recessed with the same curvature as the (spherical surface), and the inner peripheral wall 54 surrounds the upper end portion of the side surface of the head 6 of the capstan 12. The cap member 50 is formed such that the curvature at the upper surface 56 is different from the curvature at the bottom surface 53 of the receiving portion 51.

  The cap member 50 configured as described above is mounted so as to cover the upper surface 6 a of the capstan 12. At that time, the bottom surface 53 of the receiving portion 51 is in close contact with the upper surface 6a of the capstan head 6, and the inner peripheral wall 54 is in close contact with the upper end of the side surface of the capstan head 6. The upper end of the head 6 of the capstan 12 is complementarily fitted into the receiving portion 51 of the cap member 50, so that they can be in close contact with each other without a gap.

  Next, the effect of mounting the cap member 50 as described above will be described with reference to FIGS. In addition, what was shown with the chain line in each figure has shown the state at the time of key pressing.

  First, as shown in FIG. 3, when the curvature of the upper surface (spherical surface) 6 a is small in the capstan 12 before the cap member 50 according to this embodiment is mounted, the Wipen heel cross 150 provided in the Wipen 115 is used. (The point of action X) approaches the lower side of the balance pin 107 (see FIG. 14), which is the fulcrum Y, and the distance L1 between them becomes shorter (FIG. 3A). As a result, although the touch feeling at the time of key depression becomes lighter, a large force acts on the contact, and the wipen heel cross 150 is easily deformed. When the Wipen heel cross 150 is deformed, as shown in FIG. 3 (B), the depression caused by the deformation becomes an obstacle to the smooth movement of the capstan 12, and this causes a catch. This leads to the difference in feeling when the key is pressed and the generation of noise at the contact point.

  On the other hand, when the curvature of the upper surface 6a (spherical surface) is large, the contact area with the wipen heel cross 150 provided on the wipen 115 increases, and the frictional resistance increases. The position becomes far from the balance pin 107 (see FIG. 14), which is the fulcrum Y, and the distance L2 between the two becomes longer (FIG. 4). As a result, the touch sensation at the time of key depression becomes heavy, and it becomes difficult to properly maintain the sensation at the time of key depression.

  Therefore, using the cap member 50 according to the present embodiment, in the relationship with the Wipen heel cross 150 or the like, the cap member 50 having a curvature that makes the distance between the action point X and the fulcrum Y and the contact area appropriate is selected, If this is mounted on the capstan 12, it is possible to prevent the deformation of the wipen heel cross 150, the generation of noise at the contact point, and the inappropriateness of the feeling when the key is pressed due to the contact area.

  Furthermore, the cap member 50 according to the present invention is not accompanied by a change in the capstan 12 itself, but is simply attached to the upper surface 6a of the head 6 in the capstan 12 by adhesion, fitting, or the like. The curvature of the head 6 of the capstan 12 can be changed. As a result of mounting the cap member 50, the contact point with the wipen heel cross 150 is increased by the thickness of the cap member 50. This is a normal method for adjusting the height of the capstan 12. Since it can be adjusted freely (by screwing etc.), it does not cause any problems. Further, even if the weight of the capstan 12 increases due to the mounting of the cap member 50, this can be solved by adjusting the weight installed on the keyboard 105, so there is no problem.

  Therefore, by using the cap member 50 according to the present embodiment, the curvature of the upper surface 6a of the capstan 12 can be adjusted by a simple and quick method, and the feeling at the time of key pressing can be optimized.

[Embodiment 2]
FIG. 5 is a longitudinal sectional view showing a state in which the cap member 50 according to the present embodiment is mounted on the capstan 12, and FIG. 6 is a schematic view showing the operational effects of the cap member 50 according to the present embodiment.

  In particular, the cap member 50 according to the present embodiment relates to the cap member 50 used for increasing the size of the spherical surface of the upper surface 6a of the capstan head 6.

  That is, the cap member 50 shown in this embodiment has the same curvature as that of the upper surface 6a (spherical surface) of the capstan head 6 to which the cap member 50 is mounted, but has a larger vertical projection area (ie, diameter). 50.

  For example, as shown in FIG. 6, the cap member 50 formed in this way has a maximum point when the size of the head 6 of the capstan 12 is small in relation to the movement range. In this case, the contact X with the wipen heel cloth 150 can be suitably used when the spherical area deviates.

  Specifically, since the area of the spherical surface increases by attaching the cap member 50 according to the present embodiment, even if the vertical movement width of the capstan 12 is large, The contact point X can be reliably maintained within the spherical surface, and as a result, smooth contact can be realized, and the feel during key pressing can be maintained well.

  In addition, adjustment methods such as weight increase and height increase based on the mounting of the cap member 50 are as described in the first embodiment.

[Embodiment 3]
FIG. 7 is a longitudinal sectional view showing a state in which the cap member 50 according to the present embodiment is mounted on the capstan 12, and FIG. 8 is a schematic view showing the operational effects of the cap member 50 according to the present embodiment.

  In particular, the cap member 50 according to the present embodiment relates to the cap member 50 used for adjusting the direction of the upper surface 6a (spherical surface) of the head 6 in the capstan 12 to an optimum direction.

  That is, as shown in FIG. 7, the cap member 50 according to the present embodiment includes a receiving portion 51 that covers the upper surface 6a (spherical surface) of the capstan 12, an upper surface 56 that is formed on a gentle spherical surface, and an upper surface 56. And a peripheral wall portion 52 that circulates along the periphery of the rim, and by varying the height of the peripheral wall portion 52 in the circumferential direction, the direction of the upper surface (spherical surface) 56 that contacts the wipen heel cross 150 is inclined. Yes.

  By using the cap member 50 formed in this way, the contact area with the wipen heel cross 150 is ensured to be as wide as possible, and while reducing the useless spherical area, the height position can be adjusted. Thus, the capstan 12 that does not change the distance from the fulcrum Y of the contact point (action point X) is realized.

  That is, the vertical movement of the capstan 12 is not a complete vertical movement, but a rotational movement that moves in the arc direction. Therefore, the movement of the contact X during the upward movement is always the apex of the upper surface of the capstan 12 head 6. It moves in the direction away from (FIG. 8). For this reason, even if the normal spherical shape faces upward, the region closer to the fulcrum Y than the vertex is not actually used.

  Therefore, by using the cap member 50 shown in this embodiment, the area that actually contributes to the contact with the wipen heel cross 150 is increased, and the contact is always present in the spherical area, thereby making it possible to feel when pressing the key. The degree of change can be optimized. In other words, when the key is depressed, it is desirable that the feel at the time of the key depression is changed appropriately and smoothly according to the degree of the depression, and this can be realized by always having the contact point in the spherical region.

  Further, when the cap member 50 formed in this way is attached, even when the height of the capstan 12 is adjusted, the contact X moves as if the capstan 12 was driven at an inclination. Therefore, the height of the capstan 12 can be easily adjusted.

  It should be noted that the cap member 50 according to the present embodiment needs to be provided on the head 6 of the capstan 12 in a state where it can be arbitrarily removed after the cap member 50 is mounted and the height of the capstan 12 itself is adjusted. is there. Therefore, in the cap member 50 according to the present embodiment, the adhesive used for attaching the cap member 50 should be appropriately selected to have an adhesive strength that allows the cap member 50 to be attached and detached.

[Embodiment 4]
In the cap member 50 according to the present embodiment, the friction resistance value of the upper surface 56 of the cap member 50 with respect to the Wipen heel cross 150 is the same as that of the capstan upper surface 6a to which the cap member 50 is attached. The cap member 50 is different from the resistance value, and by optimizing the frictional resistance value with the wipen heel cross 150, the feel at the time of key pressing is optimized.

  That is, as described in the background art, it has been proposed in the prior art that the surface of the capstan 12 head 6 should be plated in order to improve the sliding of the capstan 12 head 6. In order to use 12, it is necessary to replace the capstans 12 one by one manually. However, since the replacement work of the capstan 12 is very labor and time consuming as described above, it is substantially difficult to replace the capstan 12 after the fact.

  Therefore, in the present embodiment, in order to optimize the frictional resistance value in relation to the Wipen heel cross 150, it is attached to the head 6 of the capstan 12 and is different from the head 6 of the capstan 12. A cap member 50 having a frictional resistance value is provided.

  Here, the optimum frictional resistance value should be appropriately selected in relation to the Wipenheel cross 150 with which the cap member 50 is in contact, and is not only adjusted to reduce the frictional resistance value, but also the Wipenheel. In order to suppress the “light” of the cloth 150, the frictional resistance value may be intentionally increased. Such a frictional resistance value can be calculated by measuring a friction coefficient by a known method.

  As a method for adjusting the frictional resistance value, the cap member 50 itself is made of a material different from that of the capstan 12 head 6 (for example, a resin such as plastic or a metal such as brass). It is possible to apply a known rough surface processing such as forming a fine scratch or protrusion on the upper surface (spherical surface) 56 of the cap member 50.

  By using the cap member 50 formed as described above, the degree of sliding of the head 6 of the capstan 12 can be adjusted easily and quickly.

  The cap member 50, the capstan 12 to which the cap member 50 is mounted, and the adjustment method of the capstan 12 using the cap member 50 can be carried out in any of an upright piano and a grand piano. Is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

[Embodiment 5]
FIG. 9 shows an embodiment of a desirable piece member 70 that is used to repair the depressions created in the Wipen heel cloth 150 by years of use, as shown in FIG. In FIG. 9, (A) and (B) show small piece members of different modes, respectively, (A) in FIG. 10 shows a state where a depression is desired to be generated in the Wipen heel cross 150, and (B) shows this state. The state which corrected the hollow is shown.

  That is, the small piece member 70 according to the present embodiment has a disk shape, for example, as shown in a cross-sectional perspective view of FIG. 9A, and one end surface (the lower surface in FIG. 9A) is a curved surface. And the other end face can be formed on a plane having a protrusion, or can be formed as a circular flat plate member as shown in the sectional perspective view of FIG. Such a small piece member 70 should be appropriately adjusted according to the size of the depression formed in the wipen heel cross 150, that is, the contact area with the capstan head 12, and is desirably slightly smaller than the produced depression. The diameter is sized so as to lift the deepest part of the recess to the initial position. For example, the small piece member 70 shown in FIG. 9A in the present embodiment has a diameter of about 2 to 10 mm, preferably 4 to 6 mm, and the thickness of the thickest central portion is about 0.2 to 2 mm. The thickness of the thinnest peripheral edge portion is preferably 0.5 to 1 mm, and can be 1 mm or less, preferably 0.2 to 0.7 mm. Moreover, the small piece member 70 shown in FIG. 9 (B) has a diameter of about 0.5 to 10 mm, preferably 1 to 5 mm, and a thickness of 0.1 to 2 mm, preferably 0.3 to 0.8 mm. Can do. Further, when the small piece member 70 is formed in such a size, it is particularly preferable to form the small piece member 70 using a synthetic resin in consideration of manufacturability. Moreover, by manufacturing using a synthetic resin, the small piece member 70 can be reduced in weight, and the change of the touch at the time of key pressing can be minimized.

  Further, it is desirable that the protrusion 71 formed on the flat surface has a sharp tip. As will be described later, when the small piece member 70 is disposed between the wipen heel cross 150 and the wipen heel undercross 151, the small piece member 70 is inserted into the wipen heel undercross 151 so as to be securely fixed. It is. In addition, in the present embodiment, one protrusion is formed at the center in the present embodiment, but it is also possible to form two or more protrusions at equal intervals.

  Further, the small piece member 70 is formed not only in a disk shape as shown in FIGS. 9A and 9B of the present embodiment, but also in a planar shape such as a substantially elliptical shape, a square shape, a rectangular shape, and other polygonal shapes. It is also possible to form irregular shapes according to the shape of the depressions. However, considering the ease of installation and the general shape of the recess, it is desirable to form the disk as shown in this embodiment. The small piece member 70 shown in the present embodiment is formed to have a peripheral wall surface having a constant height in the circumferential direction. This takes into consideration not only the ease of manufacture when manufacturing using a resin, but also the convenience of placement between the wipen heel cross 150 and the wipen heel undercross 151. That is, by forming such a vertically standing wall surface 72, the wall surface 72 can be used as an operation portion when being inserted between the wipen heel cross 150 and the wipen heel undercross 151. By inserting while pushing, it can be installed at the intended position. Further, the small piece member 70 formed as described above can be easily installed at a place where a depression is generated, and can be easily removed.

  As shown in FIG. 10, the small piece member 70 formed as described above is installed in order to correct a depression caused by the pushing-up operation by the capstan. In the present embodiment, the small piece member 70 is disposed so as to be inserted between the wipen heel cross 150 and the wipen heel undercross 151. Since the protrusion formed on the flat surface side of the inserted small piece member 70 is press-fitted into the wipen heel undercross 151, even if the pushing-up operation by the capstan is repeated in subsequent use, The small piece member 70 does not move to an unintended place. Therefore, the small piece member 70 on which such a protrusion is formed is a small piece member 70 that is particularly suitable for being used by being disposed between the wipen heel cross 150 and the wipen heel undercross 151. In particular, when the capstan is disposed at such a position, the capstan contacts the wipen heel cross 150 in the same manner as before the small piece member 70 is installed, so that the change in the frictional resistance between them can be eliminated.

  Further, when the small piece member 70 is disposed on the back side of the wipen heel cross 150 as described above, the wipen heel cross 150 is sufficiently compressed in the generated depression region. After correction, there is no fear of further depression, and it can withstand long-term use.

  The small piece member 70 is installed for repairing the Wipen heel cross 150. At this time, the cap member as shown in the first to fourth embodiments is simultaneously applied to the capstan. By installing, the contact resistance between the wipen heel cross 150 and the capstan can be arbitrarily adjusted, and as a result, it can be adjusted so that a more desirable key pressing feeling can be obtained.

  Therefore, the small piece member 70 shown in this embodiment can naturally be used alone, but a further desirable effect can be obtained by further use with the capstan cap member.

[Embodiment 6]
FIGS. 11 to 13 are diagrams for explaining a compensation member 90 formed so as to fill a recess generated in the shank roller 118.

  First, the function of the shank roller 118 will be described with reference to FIGS. 11 and 14. As shown in FIG. 14, the capstan screw 12 is lifted by a key depression with the lower side of the balance pin 107 as a fulcrum, thereby causing the Wipen range. The wiper 115 that is rotatably supported by the wiper rail 114 is rotated upward via 113. Along with the rotation of the wipen 115, the jack 117 rotatably connected to the wipen 115 rises and pushes up the shank roller 118 (FIG. 11). Then, as shown in FIG. 11, the hammer shank 121 integrated with the shank roller 118 rotates upward, and hits the string 125 with the hammer 123 attached to the tip thereof.

  When the key is depressed, the above-described operation is repeatedly performed, and the shank roller 118 contacts the repetition lever 131 for each key depression. As a result, the shank roller 118 is compressed or deformed, and the contact portion Therefore, a thinned portion (that is, a thin portion) is generated.

  Therefore, in the present embodiment, the compensation member 90 is installed in order to restore the shank roller 118 that has been deformed or worn to the initial state.

  That is, the conventionally provided shank roller 118 is composed of a hammer roller cross 118a formed in a columnar shape and a hammer roller skin 118b provided so as to cover the outer peripheral surface thereof. In the form, as shown in FIG. 12, when it becomes thin due to compression or wear after many years of use (FIG. 12B), the hammer roller cloth 118a and the hammer roller skin 118b in the thinned portion. The compensation member 90 is installed between (FIG. 12 (C)) and the initial state (FIG. 12 (A)) is corrected.

  For example, as shown in FIGS. 13B and 13C, such a filling member 90 is formed in a tile shape with a thick central portion, or in a plate shape as shown in FIG. 13D. can do. In particular, the filling member 90 formed in a tile shape with a thick central portion is installed between the hammer roller cross 118a and the hammer roller skin 118b, and at least the lower surface in contact with the hammer roller skin 118b has a curved shape, On the opposite upper surface, one or more protrusions 91 that bite into the hammer roller cloth 118a can be formed. The number of the protrusions 91 formed on the upper surface may be one as shown in FIG. 13, and two or three or more may be arranged at a predetermined interval (for example, at equal intervals). In particular, as shown in FIG. 13, the filling member 90 is preferably formed in a columnar shape having a crescent-shaped end surface with a curvature of the lower surface larger than that of the upper surface, and one or two or more are formed on the upper surface. It is desirable to form the protrusion 91. Further, the filling member 90 formed in a plate shape can be formed as a member having at least approximately the same length as the width of the shank roller 118, and the width thereof can be adjusted as appropriate. In particular, when the width of the filling member 90 is narrow, the filling member 90 has almost a bar-like shape. A plurality of such rod-shaped filling members 90 can be used in combination according to the shape of the thinned portion due to compression or wear.

  And as shown in FIG. 13 (B), the compensation member 90 is formed so that the upper surface and the lower surface directly intersect with each other, and as shown in FIG. 13 (C), it is oriented along the central axis of the curved surface. Side surfaces 92 can also be formed. Further, as shown in FIG. 13D, it can be formed in a plate shape and provided with a side surface 92. In particular, when the side surface 92 is formed, the installation position of the compensation member 90 can be adjusted while pressing the side edge when the compensation member 90 is installed, which is a desirable mode.

  In addition, the filling member 90 can be formed using a resin material having a high mechanical strength, such as Duracon (registered trademark), or other resin materials or metal materials. In particular, when forming using a synthetic resin, the weight increase can be minimized, and it is desirable from the viewpoint of manufacturing.

  If the compensation member 90 configured as described above is used, even if the contact surface of the shank roller 118 with the repetition lever 131 becomes thin due to long-term use, the shank roller 118 need not be replaced. And it can repair simply by installing the said compensation member 90. FIG. Therefore, not only the maintenance work can be easily performed, but also the cost required for the repair work can be greatly reduced.

  Further, the compensation member 90 is formed to be inserted between the hammer roller cloth 118a and the hammer roller skin 118b, and the contact with the repetition lever 131 is performed by the hammer roller skin 118b as before. Therefore, the touch at the time of key pressing can be maintained as the initial stage.

FIG. 3 is a cross-sectional perspective view showing a cap member according to the first embodiment. FIG. 2 is a longitudinal sectional view showing a state where the cap member shown in FIG. 1 is attached to a capstan. 3 is a schematic diagram illustrating the operational effect of the cap member according to the first embodiment. 3 is a schematic diagram illustrating the operational effect of the cap member according to the first embodiment. It is a longitudinal direction sectional view showing the state where the cap member concerning Embodiment 2 is attached to a capstan. 10 is a schematic diagram illustrating the operational effect of the cap member according to the second embodiment. It is a longitudinal direction sectional view showing the state where the cap member concerning Embodiment 3 is attached to a capstan. 10 is a schematic diagram showing the function and effect of the cap member according to the third embodiment. It is sectional drawing which shows the small piece member concerning Embodiment 5. FIG. It is the schematic which shows the state which repairs a hollow with the small piece member shown in FIG. 10 is a schematic diagram illustrating a function of a compensation member according to a sixth embodiment. It is the schematic which shows the state which repairs a hollow with the filling member shown in FIG. 10 is a schematic diagram showing a compensation member according to a sixth embodiment. It is explanatory drawing of the action mechanism of a grand piano. It is explanatory drawing of the action mechanism of an upright piano.

Explanation of symbols

4 Screw foot 6 Capstan head 6a Head upper surface 12 Capstan 50 Cap member 51 Receiving portion 52 Outer peripheral wall 52 Peripheral wall portion 53 Bottom surface 54 Inner peripheral wall 56 Upper surface 70 Small piece member 90 Supplementary member 105 Keyboard 107 Balance pin 115 Wipen 118 Shank roller 150 Wipen Heel Cross X Action point (contact point)
Y fulcrum

Claims (7)

A cap-like member attached to a piano capstan for driving an action in response to a key depression on the keyboard,
The cap member includes a receiving portion covering a curved surface existing on the upper end side of the capstan, and an upper surface formed on the curved surface.
The curvature of the upper surface of the cap member is different from the curvature of the upper surface of the capstan on which the cap member is mounted ,
By wearing so as to cover the upper surface of the capstan , deformation of the Wipen heel cross, generation of noise at the point of contact with the Wipen heel cross, and feeling of key press due to the contact area with the Wipen heel cross characterized that you prevent improper, piano capstan cap member.   The said receiving part has a bottom face part depressed with the same curvature as the upper face of the capstan on which the cap member is mounted, and the curvature of the cap member is different from that of the bottom face part. Cap member for piano capstan as described in 1. A cap-like member attached to a piano capstan for driving an action in response to a key depression on the keyboard,
The cap member includes a receiving portion covering a curved surface existing on the upper end side of the capstan, and an upper surface formed on the curved surface,
The diameter of the upper surface of the cap member is formed larger than the diameter of the upper surface of the capstan on which the cap member is mounted ,
By wearing so as to cover the upper surface of the capstan , deformation of the Wipen heel cross, generation of noise at the point of contact with the Wipen heel cross, and feeling of key press due to the contact area with the Wipen heel cross characterized that you prevent improper, piano capstan cap member. A piano capstan for driving actions as the keys are pressed on the keyboard,
The capstan body attached to the back side of the keyboard,
It consists of a cap-shaped cap member covering the curved surface existing on the upper end side of the capstan body,
A capstan for a piano, wherein the cap member is the cap member according to any one of claims 1 to 3 . An action mechanism of a piano that rotates a hammer by a key pressing operation,
The action mechanism of the piano in which the cap member for capstans as described in any one of Claims 1-3 is used. A method for adjusting a piano capstan, which changes at least one of a curvature and a size of an upper surface of the piano capstan for driving an action in accordance with a key depression of a keyboard,
A method for adjusting a capstan of a piano, comprising a step of installing a cap member formed in a cap shape on an upper surface of the capstan. A piano repair / adjustment method that involves repair or adjustment of the piano action mechanism.
The adjustment method is a piano repair / adjustment method involving at least the following step (1).
(1) A step of installing the capstan cap member according to any one of claims 1 to 3 with respect to a piano capstan for driving an action in accordance with a key depression of a keyboard.

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