JP3469966B2 - Stringing point adjustment device for grand piano - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string striking point adjusting device for a grand piano, and more particularly to a longitudinal striking point adjusting device.

[0002]

2. Description of the Related Art A grand piano is provided with a soft pedal for lowering the volume or changing the timbre. This soft pedal moves the reed on the shelf slightly to the right to move it with the keyboard and action mechanism on the reed, and by changing the left and right strike points of the hammer, the volume It causes a change in timbre.

The stable movement of such a reed to the left and right is
The reed is mounted on the upper surface of the shelf plate without being fixed to the shelf plate, and a member that prevents the reed from moving particularly to the rear is provided on the shelf plate side. Although such a reed is allowed to move in the left and right directions, a screw screw that protrudes from a wooden block fixed to the upper surface of the shelf board and abuts the reed is used as a member that prevents the reed from moving backward. . In addition, a hard wood maple, beech, etc. are used for the rear end of the reed that contacts the screw.
The rear end of the reed was not abraded even if it slid to the left or right while it was in contact with the screw.

[0004]

However, even when such a hardwood is used, the abrasion property still becomes a problem. That is, when performing maintenance work on the action mechanism of the grand piano or its surroundings, the reed integrated with the keyboard and the action mechanism is pulled out from the grand piano.

When the maintenance work is completed, the maintenance work is reinserted into the grand piano. At this time,
The reed on which the keyboard and action mechanism are placed is vigorously inserted into the grand piano, and the impact of the screw head hits the operator to confirm that the reed has been placed in the correct position. There is.

Therefore, the hardwood is violently collided with the head portion of the screw screw every maintenance. For this reason, even if hardwood such as maple or beech is used, the part that collides with the screw screw may be dented. If the portion contacting the screw screw is dented in this way, the reed may shift to the rear side (frame side) from the normal position, which may cause a slight change in the front and back striking points.

Furthermore, when the soft pedal is depressed and the reed moves to the right with the head of the screw screw in the recess of the wood, the head of the screw screw strongly rubs the surface of the wood. And even if you use hardwood, its wear cannot be ignored. Further, this strong friction may cause a frictional noise or make it difficult for the soft pedal to move smoothly.

[0008] Moreover, the front and rear positions of the reed can be adjusted to an appropriate position by adjusting the protruding amount of the screw screw with a tool such as a screwdriver. , Grooves (slits) and holes (cross holes,
Hexagon socket) is provided. When the tip of the tool is inserted into this groove or hole and the screw screw is rotated, the edge of the groove or hole of the screw screw rubs against the tool, and the edge of the groove or hole is sharpened or its edge. There were cases where debris was peeled off from the head. When this happens, even the hardwood of the maple or beech that slides to the left and right by contacting the head of the screw screw is easily scraped off due to the edge of the groove or hole or the debris, and the recess is rapidly enlarged. As a result, the front and rear positions of the reed further changed, and there was a risk of noise when scraping.

According to the present invention, the string striking point adjusting portion such as a screw screw is not greatly deformed even if it collides with or abuts on the string striking point adjusting portion, and it is not greatly worn due to friction. It is an object of the present invention to provide a stringing point adjusting device for a grand piano that is not scraped off by the device, and further by the sharpness of the groove of the screw screw or the edge of the hole or the debris separated from the head.

[0010]

The invention according to claim 1 is
A stringing point adjusting device for adjusting a stringing point by a hammer by adjusting a front and rear position of a reed arranged on an upper surface of a shelf plate of a grand piano, the rear end portion of the reed and one of the upper surfaces of the shelf plates. Compared to the wood that is provided and is the forming material of the one
A wear-resistant contact portion made of metal, ceramic, or wear-resistant plastic that does not cause a dent when subjected to a force due to a collision, and the rear end of the reed and the other of the upper surface of the shelf board. By contacting the wear-resistant contact portion, the rearward movement of the reed arranged on the upper surface of the shelf plate is prevented, and the amount of protrusion of the contact portion with respect to the wear-resistant contact portion is adjustable. A string-point adjusting device for a grand piano, comprising: a string-point adjusting unit.

According to a second aspect of the present invention, the wear-resistant contact portion is provided at a rear end portion of the reed, and the string striking point adjusting portion is provided on an upper surface of the shelf board. It is a striking point adjusting device for a grand piano.

According to a third aspect of the present invention, there is provided the stringing point adjusting device for a grand piano according to the first or second aspect, in which the wear resistant contact portion is made of polyester or hard nylon.
According to a fourth aspect of the present invention, the striking point of the grand piano according to any one of the first to third aspects is capable of adjusting the protrusion amount by the screw portion of the contact portion of the striking point adjusting portion. It is an adjusting device.

According to a fifth aspect of the present invention, the striking of the grand piano according to the fourth aspect is such that the top surface of the head of the screw screw that abuts against the wear-resistant abutting portion does not have a groove or hole into which a rotary tool is inserted. It is a chord adjustment device.

[0014]

According to the striking point adjusting device for a grand piano of claim 1, the wear-resistant contact portion provided on one of the rear end of the reed and the upper surface of the shelf is made of the material for forming the one. A tree
It is made of metal, ceramic, or wear-resistant plastic, which does not cause depression when subjected to a force of collision as compared with the material . Therefore, even if the reed is vigorously inserted into the grand piano and the striking point adjusting section and the wear-resistant contact section collide with each other,
As compared with wood, the wear-resistant abutting portion has almost no dent. Therefore, the reed is prevented from being displaced to the rear side (frame side) from the normal position, and the change in the striking point before and after is almost eliminated.

Further, even if the soft pedal is operated in a state where the wear-resistant contact portion and the string striking point adjusting portion are in contact with each other, the wear-resistant contact portion has almost no dent as described above, and thus the striking operation is performed. The chord point adjusting part does not strongly rub against the wear resistant contact part.
Further, the wear-resistant contact portion may be wear-resistant,
The amount of wear is extremely small, almost no friction noise is generated,
The smooth movement of the soft pedal is maintained.

Incidentally, for example, the wear-resistant contact portion is provided at the rear end portion of the reed, and the striking point adjusting portion is provided on the upper surface of the shelf board.
The wear-resistant abutting portion is preferably made of wear-resistant plastic in terms of difficulty in forming recesses, low friction, and low wear resistance, and among these, polyester or hard nylon is particularly preferable.

The abutting portion of the striking point adjusting portion is, for example, a screw screw, so that the protrusion amount can be adjusted by rotating. When a screw screw is used as the contact part of the striking point adjusting part, a groove or hole for inserting a rotary tool is provided on the top surface of the head of the screw screw contacting the wear-resistant contact part. It is preferable to set it as not. For example, if the screw head has a shape or a hole that engages the rotary tool on the side surface of the head, not on the top surface of the head, the screw screw can be engaged with this shape or hole. Even if the edge of the shape part or hole is sharpened or debris is peeled off from the head due to the work of rotating the shape part, the position of the shape part or hole will not contact the wear-resistant contact part. Since it is not the contact portion, the wear resistant contact portion is not scraped off.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a reed 2 of a grand piano according to an embodiment of the present invention, and an internal mechanism centering on a keyboard 4 and an action mechanism 6 on the reed 2, viewed from the left side. The action mechanism 6 is rotatably supported by a capstan screw 8 that rises when the keyboard 4 is pressed and a whippen rail 12 via a wippen flange 10, and rotates upward when the capstan screw 8 rises. The wippen 14 and a jack 18 that is rotatably connected to the wippen 14 and that rises together with the wippen 14 until a part 18a thereof comes into contact with the regulating button 16, and comes into contact with the jack 18 and separates when pushed up by the jack 18. A shank roller 20, and a cylindrical hammer shank 26 that is rotatably supported by a shank rail 24 via a shank flange 22 and that rotates upward when the shank roller 20 is pushed up, and a hammer shank 2
The hammer 28 is attached to the tip of the hammer 6, and the strings 30 and the like that are struck by the hammer felt 28a portion of the hammer 28.

Further, for the string 30, a damper 3 is further provided.
Two are provided. The damper 32 includes a damper lever 34 that swings in conjunction with the operation of a loud pedal (not shown), a damper wire 36 rotatably attached to the damper lever 34, and a damper head 38 attached to the tip of the damper wire 36. And a damper felt 40 which is a portion attached to the damper head 38 and abutting on the string 30.

When the player presses the keyboard 4 here, the front end 34a of the damper lever 34 is pushed up from below by the rear end 4a of the keyboard 4, and the damper wire 36, the damper head 38, and the damper felt 40 are pressed.
Is lifted and the damper felt 40 is separated from the string 30. In this way, the damper 32 operates so that the hammer 28 interlocking with the keyboard 4 hits the string 30 with the damper felt 40 separated from the string 30, as described above.

The keyboard 4 and the action mechanism 6 are
It is placed on the reed 2. Further, the reed 2 is placed on the shelf board 50. As shown in the plan view of FIG. 2, the shelf board 50
A through hole 52 is provided in the through hole 52, and a soft lever claw 54 that interlocks with a soft pedal located below the shelf board 50 penetrates the through hole 52 to the upper surface 50a of the shelf board 50, and the rear end portion 2a of the reed 2. It is inserted in the notch 2b provided in the.

When the player steps on the soft lever, the soft lever claw 54 moves to the right side in FIG. 2 in the through hole 52, and the reed 2 moves slightly (for example, 2 to 3 mm).
Since the action mechanism 6 is attached to the reed 2 together with the keyboard 4, the movement to the right causes one of the two strings 30 hit by the hammer 28 to come off and the hammer 28 Can't be hit, or
It is possible to change the volume and timbre by striking the string 30 at a portion of the hammer felt 28a at the tip of the hammer 28 that is not normally used. When the player returns the soft pedal to its original position, the reed 2 is pushed back to its original position by the leaf spring 58 attached to the side plate 56, and the volume and timbre return to the normal state.

A keyboard pillow 2d exists on the rear end of the reed 2, that is, on the rear 2c, and supports the rear end 4a of the keyboard 4 when the keyboard 4 is not pressed. Further, the rear end portion 2a of the reed 2 is provided with a wear-resistant contact portion 60 made of polyester. As shown in the partial perspective view of FIG. 3, the wear-resistant contact portion 60 is made of a polyester block, and through holes 60a for screwing are provided on the left and right sides thereof. A screw 64 having a slot 64a on the head is passed through the through hole 60a of the abrasion resistant contact portion 60, and as shown in FIG. 4, the storage recess 6 provided at the rear end portion 2a of the reed 2 is held.
The wear-resistant contact portion 60 is fixed to the reed 2 by fitting the wear-resistant contact portion 60 into the reed 2 and screwing the screw 64 into the reed 2. The head of the screw 64 penetrates the large diameter portion of the entrance of the through hole 60a, but does not penetrate the small diameter portion inside, so the head of the screw 64 enters the deepest portion of the large diameter portion of the through hole 60a. I'm out. Therefore, it does not appear on the surface 60b of the wear-resistant contact portion 60.

Further, on the shelf board 50, the wear resistant contact portion 6 is provided.
A string striking point adjusting unit 66 is provided facing 0. The string striking point adjusting section 66 is composed of a rectangular parallelepiped wooden block 68 and a metal screw screw 70 screwed into the block 68. Block 68 is a shelf board 50
It is fixed with screws and adhesives. This block 68
A screw screw 70 is screwed into the surface 68a on the reed 2 side, and the hemispherical top surface 70b of the head portion 70a thereof is in contact with the surface 60b of the wear-resistant contact portion 60.

Therefore, the amount of protrusion of the head portion 70a from the block 68 can be adjusted by the screwing amount of the screw screw 70 into the block 68. The head 70a of the screw 70 has a top surface 70b having a wear-resistant contact portion 60.
It prevents the reed 2 from moving rearward by contacting the
This is for positioning the reed 2 in the front-rear direction. Therefore, by rotating the screw screw 70 and adjusting the amount of protrusion of the head 70a from the block 68, the reed 2
The position in the front-back direction can be adjusted.

The head portion 70a of the screw screw 70 is provided with a hole 72 penetrating in a direction perpendicular to the axial direction thereof and opening to a side surface 70c of the head portion 70a. This hole 72
Is for rotating the screw screw 70 by inserting a rod-shaped rotary tool having a thin tip. Also, the head 70
The top surface 70b of "a" is formed only on a smooth hemisphere, and is not shaped so that the rotary tool can be locked. For this reason, the rotary tool has its tip at the head 7
It can be inserted only in the hole 72 of the side surface 70c of 0a. By this insertion, the rotary tool is locked to the head portion 70a and the head portion 70a is rotated, whereby the amount of protrusion from the block 68 can be adjusted.

In the configuration of the above-described embodiment, after pulling out the reed 2 from the grand piano for maintenance,
Again, when the reed 2 is slid backward on the upper surface 50a of the shelf board 50 in order to install the reed 2 in the proper position on the shelf board 50, the rear end portion 2a of the reed 2 has already protruded. The head 70a of the adjusted screw 70 collides. At this time,
Although the top surface 70b of the head portion 70a contacts the wear-resistant contact portion 60, the wear-resistant contact portion 60 is made of polyester and is hardly deformed in a normal collision. That is, there is no dent.

Further, with the reed 2 thus set, the soft pedal is depressed by the performer, and the reed 2 is moved to the position shown in FIG.
Even if the reed 2 moves back in the direction of the arrow L in FIG. 4 even if it moves in the direction of the arrow R in FIG. 4 or is released from the soft pedal, the surface 60b of the wear-resistant contact portion 60 is not recessed. , The top surface 70b of the screw screw 70 and the wear-resistant contact portion 60
The friction with the surface 60b is not so large. Further, since the wear-resistant contact portion 60 itself is made of polyester and has high wear resistance, the surface 60b of the wear-resistant contact portion 60 will not be worn even if the operation of the soft pedal is repeated.

Further, the top surface 70b of the screw screw 70 that rubs against the surface 60b of the wear-resistant abutting portion 60 is only configured as a smooth hemisphere, and has a shape for locking a rotary tool. Since it does not rub against the rotary tool, no debris separated from sharp parts or the head is formed. Therefore, the screw 70
The top surface 70b of the wear-resistant contact portion 6 remains smooth, and the surface 60b of the wear-resistant contact portion 60 is not scraped off.
The shape of the zero surface 60b is maintained.

Since the present embodiment is constructed as described above, even if the abrasion resistant contact portion 60 of the reed 2 collides with the screw screw 70 of the striking point adjusting portion 66 or slides by contacting it. It does not deform significantly and is not worn or scraped off due to friction. Therefore, the reed 2 can be held at a suitable position for a long time. Also, from this, there is no abnormal sound when using the soft pedal, and it is not difficult to operate the soft pedal.
A stable performance effect can be obtained.

The forward movement of the reed 2 is prevented by, for example, the lower mouth rod 80 contacting the front end portion 2e of the reed 2. Further, for example, as shown in FIG. 5, the left and right time beats 82, 84 of the reed 2 are provided with holes 86 in the left-right direction, and the holes 86 are sufficiently thin and are perpendicular to the side ends 2f, 2g of the reed 2. The forward movement of the reed 2 is also prevented by adopting the configuration in which the rod 88 extending in the direction is inserted. The holes 86 in the left and right directions of the time signatures 82 and 84 are the time signatures 8
Since the lower surface side of 2, 84, that is, the side of the shelf board 50 is open, the time signature 82, 84 can be removed upward as indicated by the arrow U during maintenance, so the reed 2 can be removed from the grand piano. . After maintenance, the reed 2 is placed on the shelf board 50, and the rod 88
The time signatures 82 and 84 may be placed from the top so as to enter 6.

Since the mechanism for preventing the reeds 2 from moving forward does not collide with each other at the time of maintenance, unlike the mechanism for preventing the movements to the rear, dents, friction and wear are hardly problems. [Others] In the above embodiment, polyester is used as the wear-resistant contact portion 60, but other wear-resistant plastics such as hard nylon may be used. In addition to wear-resistant plastics, metals that are other wear-resistant materials,
Ceramic or the like may be used. However, if the wear-resistant contact portion 60 is made of metal or ceramic, the screw screw 70
It is preferable to use wear-resistant plastic for the top surface 70b of the above because it slides smoothly without generating noise.

In the above embodiment, the abrasion resistant contact portion 60 is provided on the rear end portion 2a of the reed 2 and the string striking point adjusting portion 66 is provided on the upper surface 50a of the shelf board 50. A string striking point adjusting portion 66 is provided on the rear end portion 2a, and a wear resistant contact portion 60 is provided on the shelf board 50 side.
May be provided. That is, a screw screw 70 may be screwed into the rear end portion 2a of the reed 2 to form the striking point adjusting portion 66, and the wear-resistant contact portion 60 may be attached to the surface 68a of the block 68 on the reed 2 side.

The screw 70 has a head portion 7
A hole 72 is formed in the side surface 70c of the screw 0a and the tip of the rotary tool is inserted into the hole 72, so that the screw screw 70
Although it has been possible to rotate, the rotary tool may be engaged with other than the top surface 70b of the head portion 70a.
The head portion 70a of the screw screw 70 may be formed in a hexagonal column or other prismatic shape like the head portion of a hexagonal bolt. In this case, a side face 70c of the head portion 70a is engaged with a spanner to rotate. May be.

The capstan screw 8 attached to the keyboard 4 has the same shape as the screw screw 70 of the striking point adjusting section 66, and since this shape has the same function, the striking operation is performed. The capstan screw 8 may be diverted as the screw screw 70 used in the chord point adjusting unit 66.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an internal mechanism centering on a reed, a keyboard, and an action mechanism of a grand piano according to an embodiment of the present invention.

FIG. 2 is an explanatory plan view thereof.

FIG. 3 is a partial perspective view of a rear end portion of the reed.

FIG. 4 is an explanatory diagram of a relationship between a wear resistant contact portion and a string striking point adjustment portion.

FIG. 5 is an explanatory diagram showing an example of a configuration for preventing the reed from moving forward.

[Explanation of symbols]

2 ... Reed 2a ... Rear end 2b ... Notch 2
c ... after reed 4 ... keyboard 6 ... action mechanism 28 ... hammer 28a ... hammer felt 30 ... string 50 ... shelf board 50a ... upper surface 52 ... through hole 54 ... soft lever claw 56 ... side plate 58 ... leaf spring 60 ... wear resistance Contact part 60a ... Through hole 60b ...
Surface 62 ... Storage recess 64 ... Screw 64a ... Sliding 66 ... String striking point adjusting section 68 ... Block 70 ... Screw screw 70a ... Head 70b ... Top surface 70c ... Side surface
72 ... hole

Continuation of the front page (56) Reference JP-A-5-341774 (JP, A) JP-A-7-210150 (JP, A) Actually opened 56-102587 (JP, U) Actually opened 58-178195 (JP , U) Actually open 61-176590 (JP, U) Actually open 52-97532 (JP, U) Actually open 2-104395 (JP, U) Actual public 55-33353 (JP, Y2) Actual public Sho 63-23754 (JP, Y2) Actual public Sho 58-43015 (JP, Y2) Actual public Sho 62-43345 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G10C 3/12 G10C 3/16 G10C 9/00

Claims (5)

(57) [Claims] 1. A string striking point adjusting device for adjusting a string striking point by a hammer by adjusting a front and rear position of a reed arranged on an upper surface of a shelf plate of a grand piano, the rear end of the reed and the shelf. It is provided on one side of the board,
Compared to the wood that is one of the forming materials, the force of collision
Metal, ceramic or wear-resistant plastic that does not cause a dent when receiving, and a wear-resistant contact portion provided on the other end of the reed end of the reed and the top surface of the shelf,
By contacting the wear-resistant contact portion, it is possible to prevent rearward movement of the reed arranged on the upper surface of the shelf board, and the amount of protrusion of the contact portion with respect to the wear-resistant contact portion can be adjusted. A striking point adjusting device for a grand piano, which is provided with a striking point adjusting unit. 2. A string-striking string for a grand piano according to claim 1, wherein the wear-resistant abutment part is provided at a rear end part of the reed, and the string-striking point adjusting part is provided on an upper surface of the shelf board. Point adjustment device. 3. The striking point adjusting device for a grand piano according to claim 1, wherein the wear-resistant contact portion is made of polyester or hard nylon. 4. The striking point adjusting device for a grand piano according to claim 1, wherein the protrusion amount can be adjusted by using a screw thread at the contact portion of the striking point adjusting portion. 5. The striking point adjusting device for a grand piano according to claim 4, wherein the top surface of the head of the screw screw that abuts against the wear-resistant abutting portion does not have a groove or hole into which a rotary tool is inserted.