JP2002182649A - Action mechanism and keyboard instrument having this action mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve repetition (repetitive striking function) while maintaining the advantage of suppressing the shifting of striking positions, etc. SOLUTION: The action mechanism 1 in this keyboard instrument is a flip-up system and is constituted by projectingly providing the base end of a hammer body 7 with a bill-like projecting piece 31 and forming an engaging step 41 at an escapement member 9 kept energized at all times toward the bill-like projecting piece 31 of the hammer body 7. Accompanying a key touch operation, a pivotal fitting part of the hammer body 7 turns in a blow direction and the projecting piece 31 and the engaging step 41 engage each other, thereby actuating the hammer body 7 to turn. At least either of the base end of the hammer body 7 and the escapement member 9 is provided with an extruding member 32 which extrudes the escapement member 9 to a side opposite to the hammer body 7 by accompanying the turning action of the hammer body 7 thereby detaching the projecting piece 31 from the engaging step 41. The escapement member 9 is provided with a turning member 10 to improve the repetition (repetitive striking function).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an action mechanism for striking a sound source or sounding a sounding body in response to a key operation of a keyboard, and a keyboard instrument, and more particularly to an action mechanism called a flip-up type. It is suitable for application to keyboard instruments.

[0002]

2. Description of the Related Art Currently, keyboard instruments that perform hammer actions, such as pianos, are equipped with the same type of action mechanism, although the standards are slightly different. In other words, modern pianos employ a British-style action mechanism called a push-up type.

However, in the 19th century, besides this push-up type, a German or Wien type action mechanism called a flip-up type was widely known as another mechanism. Such past mechanisms and the historical change of the flip-up system described later are described in Walter, 1979 (3rd edition).
It is described in Pfeiffer's "Vom Hammer". Before confirming this material (about 15 years ago), the inventor was interested in this kind of keyboard instrument by seeing a photograph of the musical instrument Orphica, and began producing it. Was.

The basic feature of this flip-up type is that the rotation center axis of the hammer is attached to a key. The most significant advancement of this flip-up action mechanism took place in the 18th century. In other words, Johann Andoreas Stein (1728-1792) used an independent key for each key, instead of the part where the hammer beak behind the fixed rail-shaped key was hooked. A tongue-shaped part was attached to create an outstanding touch. This was the most important advance in flip-up action, and determined the mechanism of flip-up action.

[0005] Stein's action mechanism did not include a backcheck (which stops the movement of the hammer that bounces off the string after striking it). But,
It is Stein's achievement that created the basis for the German action and determined the final form of the flip-up action.

[0006] The world-famous Vienna-style action is
It was taken over by Stein's daughter, Nanette, and keyboard instrument maker and her husband, Johann Andoreas Streicher, further evolving its identity. Therefore, the German-style action was called Wien-style when Stein's daughter Nanette married to Vienna, and the roots are often described together as "German-Wien-style action" because of their roots. You.

[0007] The touch (playing condition) of the improved system in which an independent tongue-shaped part is attached to each Stein's key (for example, see FIG. 29) is very light, and let-off (before the collision of the hammer and the string) with the key. No increase in pressure due to the movement or action of separating the movement of the hammer from the movement of the hammer is felt at all, and it is easy to repeatedly hit. The depth of the key is about 6 mm, and the key weight (value of how many grams the key drops) is 30 grams for low tones and 20 grams for high tones.

On the other hand, in the current piano, when a key is depressed, there is a considerable resistance at the time of let-off, that is, an increase in the force to push the key back. And the key depth is 9.5-10
Mm. Steinway's grand piano is a representative with a small key weight, but averages around 47 grams.

[0009] Although such improvements have been added to flip-up action mechanisms, the trend in the world has been to push-up actions. This is due to the fact that the British-style action, which is a push-up type during this time, has undergone a definitive improvement that is now common sense. It was a repetition action, invented in 1821, and further improved in 1840 to become the current grand piano action.

[0010] In the piano action, once a key is depressed to produce a sound (stringing), the finger must be lifted to raise the key to "a certain height" to prepare for the next stringing. In the repetition action, a mechanism devised to minimize the "a certain height" required to prepare for the string striking as much as possible. With this mechanism, the continuous tapping function can be enhanced (= consecutive tapping can be easily performed).

As far as the inventor knows, upright pianos do not have this function except for two limited models worldwide. Therefore, it is a point of comparison of the playability between the upright piano and the grand piano. This is called "Kurzhubwerk" in German. The meaning is understood as "lifting shortening function".

Furthermore, the flip-up (Vienna) action has a major structural problem. This problem was already noticed by the inventor when he tried to produce a keyboard instrument about 15 years ago, but until recently, this problem was described in this document "Vom Hammer". I didn't notice what was being done. The structural problem of the Wien-type action is that the center axis of rotation of the hammer moves as the key moves. This causes the following inconveniences.

Usually, when striking a string, it is generally assumed that the key is pushed down to the bottom, but it is also possible to strike the key in a different state, for example, momentarily striking the key with a strong force. . In other words, it is a Forte star cart.

[0014] In this case, the hammer jumps up and strikes the string by the recoil of momentarily striking the key with a strong force, but the key is not pushed down to the bottom but is located somewhere in the middle. In the Wien type action, since the rotation center axis of the hammer is attached to the key, the position of the rotation center axis of the hammer at that time is lower than the state where the key is pushed down to the bottom. As a result, in each of the above two states, the position of the rotation center axis of the hammer is different,
The hammer will reach the strings in different trajectories, and the part of the hammer head that swings on the strings will also differ.

The hammer head striking point (point where the string touches)
The deviation occurs in the front-back direction when viewed from the player, so if the strings are stretched side by side so as to intersect the direction in which the key is extending, not only will the target string not be struck due to this deviation, It is possible that another string or a string of a plurality of unnecessary sounds may be struck simultaneously. Also, when looking at the hammer side, the horn comes into contact with the strings at a wide range and at an unspecified point on the top of the hammer, so that the tone becomes unstable and the tone quality cannot be adjusted.

Such a flip-up Wien-type action mechanism 373 is shown in FIGS. FIG.
As shown in FIG. 9, a keyboard body 305 having a keyboard portion (not shown) on the right side in the drawing has a longitudinally intermediate portion held by a pin 313 and a pedestal 315 so as to be swingable. A support rod 375 is provided upright at the other end of the keyboard body 305, and a base of a hammer body 377 for striking a string 307 is rotatably supported by a rotation center shaft 378 at the upper end of the support rod 375. ing.

At the base end of the hammer body 377, a beak-shaped projection 3
79 are protrudingly provided. An engagement step 383 is formed on the escapement member 381 which is constantly urged by the spring bar 380 toward the beak-shaped projection 379 of the hammer body 377. On the other hand, the machine frame 385 has a back check 389 along the rotation locus of the hammer portion 387 of the hammer body 377.
A sliding member such as leather is stuck on the surface of the back check 389.

At the time of the performance, as shown in FIGS. 30 and 31, the supporting rod 375 at the other end of the keyboard 305 rises toward the string 307 and the hammer 377 The beak-shaped protrusion 379 and the engagement step 383 of the escapement member 381 are engaged. Thus, the hammer body 377 performs a striking rotation operation on the string 307.

The engagement between the beak-shaped protruding piece 379 of the hammer 377 and the engaging step 383 of the escapement member 381 is released (let off) as shown in FIG. 31 immediately before the hitting operation of the hammer 377. It is designed to be. The timing of this detachment can be finely adjusted by the adjusting screw 391. When the player releases the keyboard, the released beak-shaped protruding piece 379 slides down on the return sliding surface 393 of the escapement member 381 as shown in FIG. 32, and returns to the posture shown in FIG. I do. Further, the hammer body 377 after striking the string 307 is strongly returned to the original position direction by the repulsive force of the string 307, but the movement is caused by sliding friction between the hammer portion 387 of the hammer body 377 and the back check 389. And is stopped. Therefore, the hammer body 377
Will not strike string 307 again due to rebound.

The let-off of the Wien-type action mechanism 373 is performed by swinging the keyboard body 305.
7 utilizes that the rotation center axis 378 moves in a front-to-back relationship when viewed from the player. In other words, when the keyboard is depressed, the tip of the beak-shaped protruding piece 379 on the opposite side of the hammer 387 moves so as to be pulled out from the escapement member 381, thereby causing let-off.

Therefore, the more the player wants to ensure the let-off operation, the more he wants to move the rotation center axis 378 away from the keyboard body 305 and to set it at a higher position, and the movement distance of the rotation center axis 378 in the front-back relationship with respect to the player. I have to make it longer. In addition, the back check 389 also needs to be installed at a high position in response to this, so that it is difficult to design the action mechanism 373 to have a small vertical height. In addition, it is necessary to provide the back check 389 and adjust the degree of hitting, so that there is a problem that the number of parts and the number of assembly steps are large.

Further, in the conventional Wien-type action mechanism 373, the entire action mechanism 373 is provided at the striking point of the hammer portion 387 of the hammer body 377 (the hammer portion 387 has the string 3).
07), it projects to the opposite side of the keyboard portion by a length L (see FIG. 29) including the installation position of the hammer body 377 and the escapement member 381, so that the overall depth of the keyboard instrument can be designed to be small. It was difficult.
Further, if the hammer body 377 becomes larger, the rotation center shaft 378 of the hammer body 377 must be set at a higher position.
The deviation of the string striking point (the point where the hammer 387 contacts the string 307) becomes large.

[0023]

In order to solve these problems, the inventor has previously developed an action device for a keyboard instrument disclosed in Japanese Patent No. 3035826. The object of the patent is to make it possible to design the height and depth of the action mechanism portion to be small while suppressing the displacement of the striking point, and to have a flip-up action mechanism with a small number of parts and a small number of assembly steps, and a keyboard instrument having the action mechanism. Was to provide. Another object of the present invention is to provide a flip-up action mechanism that allows the user to play even when the main body is tilted, such as a standing performance, and a keyboard instrument having the action mechanism.

As shown in FIG. 33, an action mechanism 401 disclosed in Japanese Patent No. 3035826 has a keyboard body 405 having a keyboard section 403 on the right side in the figure, and a string 407 serving as a sound source body.
And an escapement member 411 for controlling the hammering operation of the hammer body 409.

In FIG. 33, an intermediate portion in the longitudinal direction of a keyboard body 405 having a keyboard portion 403 at the right end in the figure is swingably held on the upper surface of a base 415 by pins 413. As shown in FIG. 34, a hole 405a is formed on the opposite side of the pivot fulcrum of the keyboard 405 (which is also a holding point at the position of the pin 413).

The hammer body 409 has a hammer portion 417 at its tip for striking a string 407 (see FIG. 33).
At the base of the hammer body 409, a hole 409a is opened,
On the opposite side to the hammer 417 with the hole 409a interposed therebetween, a beak-shaped projection 419 serving as a projection is projected. In addition, an extrusion protrusion 421 as an extrusion member is provided on the upper side of the drawing with respect to the beak-shaped projection 419.

Then, as shown in FIG.
5 and the hole 409a of the hammer body 409,
By inserting and fastening a set screw 423 having a female screw on the inside and a set screw 424 having a male screw on the outer periphery via a washer 426, the keyboard body 405 and the hammer body 409 are relatively rotatable. Fix by axle attachment. The inner diameter of the hole 409a of the hammer body 409 is slightly larger than the outer diameter of the female screw 423 on the female side (outside).
“a” is rotatable with respect to the female side set screw 423.
A keyboard lead (key red) 420 for adjusting the weight balance of the keyboard 405 is provided on a side surface of the keyboard 405. An appropriate number of the keyboard leads 420 are inserted through holes formed in the keyboard body 405, and are fixed by hitting from both sides in the compression direction to increase the diameter. Note that the set screw 423 serves as a fulcrum of rotation of the hammer body 409.

As shown in FIG. 35, the escapement member 411 has an engagement step 431 inside the center of the back piece 429.
And a suppressing member 433 protruding from the upper end of the back piece 429. Then, cushions 435 and 436 made of cloth or felt are attached to the lower surface of the suppressing member 433 and the upper side in the figure of the engaging step portion 431, respectively. Further, a sliding member 437 made of a series of leathers is adhered to the lower surface and the protruding surface of the engaging step portion 431 and the front surface of the cushion 436, whereby the engaging step portion 431 of the back piece 429 is A return sliding surface 439 that connects the upper side and the right vertex of the engaging step portion 431 in the drawing is formed.

A groove 441 is provided at the lower end of the escapement member 411, and the upper end of a spring plate 443 made of carbon fiber is inserted into and bonded to the groove 441. The lower end of the spring plate 443 is fixed to the stopper plate 44 by a screw 447.
5 to the machine base 449. Thus, the escapement member 411 is constantly urged toward the base of the hammer body 409 by the elastic force of the spring plate 443.

As shown in FIG. 33, the machine base 449 has a hammer portion 417 and a base portion (the set screw 42) of the hammer body 409.
3), the cushions 453 and 455 made of cloth are laid respectively.

Next, the operation of the action mechanism 401 will be described. In FIG. 33, when the player performs a key operation on the keyboard section 403, the pins 413 and the pedestal 41 are pressed.
The keyboard body 405 rotates clockwise in FIG.
The shaft attachment portion of the hammer body 409 (the pivot point of the hammer body 409 at the position of the set screw 423) rises in the striking direction, that is, toward the string 407. Due to this rise, the beak-shaped protrusion 419 of the hammer body 409 is engaged with the engagement step 431 of the escapement member 411.

When the player further depresses the keyboard portion 403, as shown in FIG. 36, the shaft attachment portion (position of the set screw 423) of the hammer body 409 further rises toward the string 407, while the beak-shaped projection piece Since the ascending step 431 is prevented from rising by the engaging step 431, the hammer 417 of the hammer body 409 rotates, and the hammer body 409 performs a striking and rotating operation toward the string 407. At this time, the pushing projection 421 of the hammer body 409 contacts the return sliding surface 439 of the escapement member 411 and gradually pushes the escapement member 411 against the elastic force of the spring plate 443 on its back side (FIG. (Left side of 36).

The hammer 417 of the hammer body 409
Hits the string 407, but immediately before the hit, the escapement member 411 is completely pushed out to the back side by the pushing protrusion 421 of the hammer body 409 against the elastic force of the spring plate 443. Beak-shaped projection 41 of body 409
9 is detached (let-off) from the lower surface of the engaging step portion 431. The hammer part 417 of the hammer body 409 when hitting is
As shown in FIG. 37, the beak-shaped protruding piece 419 is located above the lower surface of the engaging step portion 431 of the escapement member 411 in the figure. Therefore, when the escapement member 411 returns from the retracted position due to the elastic force of the spring plate 443, the beak-shaped protruding piece 419 detached from the engagement step 431 is located above the lower surface of the engagement step 431. It comes into contact with the sliding surface 439.

The beak-shaped projection 419 of the hammer body 409
Is released (let-off) from the lower surface of the engaging step portion 431, the hammer body 409 still rotates by inertia, and the hammer portion 417 hits the string 407. Meanwhile, the keyboard section 403 is being pressed down by the player (see FIG. 37). The hammer part 417 after the hit has the string 4
The hammer 409 is rotated in the opposite direction (clockwise in the figure) by the repulsion force of 07 and is thrown downward in the figure.

Here, the restraining member 433 of the escapement member 411 abuts on the upper surface of the base end of the hammer body 409, whereby the hammer body 409 is moved to the hammer part 417.
Is stopped at a position away from the string 407 (FIG. 38).
reference). That is, the lower surface of the suppressing member 433 is in close contact with the upper surface of the base end portion of the hammer body 409 due to the pressing force of the keyboard portion 403 and the regulation of the suppressing member 433, and the rotation of the hammer body 409 in the clockwise direction in the drawing is prevented. At the same time, the rotation of the hammer body 409 in the counterclockwise direction in the drawing due to the reaction force of the collision between the lower surface of the suppressing member 433 and the hammer body 409 is also prevented. In this way, the rotation of the hammer 417 is suppressed by the suppressing member 433.
Therefore, the hammer body 409 does not strike the string 407 again due to rebound.

Finally, when the player releases the keyboard 403,
As the keyboard portion 403 floats, the opposite end of the keyboard body 405 descends, thereby causing the beak-shaped protrusion 419 to return to the return sliding surface 439.
, And returns below the engagement step 431.
On the other hand, at this time, the hammer body 409 is released from the suppression by the suppression member 433, falls to the cushion 455 by its own weight, and returns to the posture shown in FIG.

As described above, in the action mechanism 401 disclosed in Japanese Patent No. 3035826, the escapement member 411 is attached to the base end of the hammer body 409 on the opposite side to the hammer body 409 as the hammer body 409 strikes and rotates. The protrusion 421 serving as an extruding member for extruding the beak-shaped protrusion 419 of the hammer body 409 from the engagement step portion 431 is provided, whereby the beak-shaped protrusion 41 of the hammer body 409 is provided.
9 can be forcibly disengaged from the engagement step 431 of the escapement member 411. Therefore, FIG.
And the like, a member such as a support rod 375 for increasing a horizontal (keyboard portion) movement component in the arc-shaped movement locus of the beak-shaped protruding piece 379 as in the past shown in FIG. Since the length of 305 can be designed to be short, the height and depth of the action mechanism 401 (see FIG. 33) can be designed to be extremely small.

Further, the hammer body 409 is separated from the string 407 in a state where the beak-shaped protruding piece 419 is separated from the escape step member 431 while being opposed to the escapement member 411 in the striking direction so as to be able to freely contact with the hammer body 409. Since the restraining member 433 for stopping by stopping is formed integrally, the back check 389 shown in FIG. 29 and the like becomes unnecessary, and the number of parts and the number of assembling steps can be reduced. In addition, since the bulky back check 389 becomes unnecessary, the action mechanism 401
The vertical height of the portion can be reduced.

Further, Japanese Patent No. 3035826 discloses another type of action mechanism 501. As shown in FIG. 39, the action mechanism 501 is provided with an escapement member 511 and a set screw 5 for pivotally attaching the hammer body 509.
Keyboard portion 503 for 23 (the other set screw is not shown)
It is arranged on the side.

The hammer body 509 of the action mechanism 501 has an arm 510 formed relatively short, and a beak-shaped projection 519 serving as a projection at a base end (right end in FIG. 39). Further, an operation block 512 which is an extrusion member which protrudes upward (toward the string 507) with respect to an extension of the arm portion 510 is formed. On the other hand, the escapement member 511 is provided with a concave portion, and an engaging step 531 is provided below the concave portion, and the suppressing member 5
33 respectively, and an escapement member 51
An adjusting screw 530 is screwed into the back piece 529 of the first.

The lower end of the escapement member 511 is swingably fixed to the mounting table 542 by a shaft 543, and a coil spring 541 is mounted on the keyboard 503 side (right side in FIG. 39). 511 is constantly urged toward the base end of the hammer body 509. On the other hand, a coil spring 5
06, the keyboard body 505 is constantly urged downward.

The hammer body 509 is rotatably pivotally mounted on the keyboard body 505 by the set screw 523. Here, the sliding friction between the hammer body 509 and the keyboard body 505 is reduced. For the purpose of reduction, the washer 4 shown in FIG.
It is preferable to interpose a thrust bearing (not shown) instead of 26.

On the machine base 549, bars 544 and 545 are erected, and a soundboard 546 is attached to the upper ends of the bars 544 and 545, and a triangular prism-shaped piece 547 is provided substantially at the center of the soundboard 546. Fix it. These machines 549, pier 544,
The 545 and the sound board 546 constitute a sound box 548. A tuning pin 551 that fixes one end of the string 507 and adjusts its tension, and a trapezoidal piece 552 are fixed to a similar fixing portion disposed above the machine base 549.

According to this action mechanism 501, the extension (string 50) of the extension of the arm portion 510 of the hammer body 509.
(7 side), the operation block 512 serving as an extruding member is formed so as to protrude. Therefore, even when the keyboard portion 505 and the arm portion 510 of the hammer body 509 are formed short, the escapement member 511 is not reduced. It can be designed to have a sufficient size, can be operated reliably, and can have durability.

Further, since the mounting position of the set screw 523 can be designed low with respect to the operation block 512, the entire keyboard instrument can be designed to be flatter. Further, in the action mechanism 501, the escapement member 51
A coil spring 541 is attached to the lower end of the hammer body 509, and the escapement member 511 is always urged toward the base end of the hammer body 509. There is no risk of accidentally hitting 507. Further, since a thrust bearing is interposed between the hammer body 509 and the keyboard body 505, friction between them is small. Further, since the keyboard 505 is constantly urged downward by the coil spring 506, the keyboard 503 does not float. Therefore, it is possible to stand or sit on such a keyboard instrument in a playing posture as when playing an accordion.

The inventor then sets the action mechanism 501 to a metal plate 603 as a sound source as shown in FIG.
An action mechanism 601 has been created which can be applied to a. The action mechanism 601 includes the action mechanism 50
The structure is basically the same as 1
The same reference numerals are given and the description is omitted, and only different main parts are shown and described.

The escapement member 511 is exactly the same as the action mechanism 501 except that the hammer body 602 that engages with the escapement member 511 is different from the hammer body 509 of the action mechanism 501 and the sound source body is the string 507. The difference is that a metal plate 603 is arranged vertically instead.

In the action mechanism 601, the keyboard body 505
At the other end opposite to the keyboard portion 503, a cushion material 605 made of felt with which the lower end of the hammer portion 604 of the hammer body 602 abuts is arranged. As a result, the hammer body 602 released from the hammer stop does not directly fall to the position of the stationary state, so that the performance of the repetition (continuous hitting function) is somewhat increased. At the tip of the hammer 604, a sounding portion 606 that comes into contact with the metal plate 603 is provided so as to be orthogonal to the metal plate 603 at the time of sounding. As shown in FIG. 40, the tip of the striking portion 606 has a circular curved surface 607, and a striking portion having another shape can be appropriately bonded to the hammer portion 604. Metal plate 6
Reference numeral 03 denotes a hanging support member 609, 609, which is inserted into openings 608, 608 on the upper and lower ends, and is held.

The mounting position of the tapping portion 606 is shown in FIG.
, And can be adhered so as to be in an appropriate position. In FIG. 42, the metal plate 603
Are suspended vertically, but even when installed diagonally, the sounding portion 606 can be adhered diagonally in accordance with it.

Below the keyboard portion 503, a pedestal 610 fixed to the base 549, a keyboard position regulating rod 611 having an oval cross section fixed to the pedestal 610, and a disk-shaped plate mounted on the pedestal 610. Cushion part 61 made of felt material etc.
2 are provided. The keyboard position regulating rod 611 enters a slot-shaped groove 613 provided in the keyboard body 505 to regulate the lateral position of the keyboard body 505. The upper part of the groove 613 is closed by the keyboard 503.

On the pedestal 415, a support 614 having a semicircular cross section is arranged so as to cross the keyboard 505 in order to facilitate the swinging of the keyboard 505. It is preferable that a cushion material made of felt or the like be placed on the support portion 614. The pin 413 having a circular cross section is
5, the fan-shaped hole 615 whose length in the longitudinal direction becomes longer as it goes upward, so that the keyboard body 505 can swing around the contact portion with the support portion 614 as a fulcrum. Is configured.

One end of the coil spring 506 enters a hollow portion 617 provided in a fixing portion 616 fixed to the machine base 549, and the other end is in contact with the keyboard 505. The urging force is adjusted by the adjusting screw 618. When the back piece 529 of the escapement member 511 abuts on the fixing portion 616,
A cushion member 619 made of felt or the like that performs a cushion function is adhered and fixed.

The action mechanisms 401 and 501 shown in Japanese Patent No. 3035826 and the action mechanism 601 newly developed by the present inventor have various advantages as described above and are sufficiently practical. However, the repetition (repeated tapping function) is still inadequate and still quite inferior to the action of a grand piano.

The present invention has the advantages of the action mechanism disclosed in Japanese Patent No. 3035826. That is, the height and depth of the action mechanism portion can be designed to be small while the displacement of the hitting position is suppressed, and the number of parts and the number of assembly steps are reduced. It is an object of the present invention to provide an action mechanism capable of improving a repetition (continuous tapping function) while maintaining the advantage of being able to do so, and a keyboard instrument having the action mechanism.

[0055]

In order to achieve the above-mentioned object, an action mechanism of the present invention provides a keyboard body having a keyboard portion at one end and a middle portion in the longitudinal direction of the keyboard body or the other end thereof can be freely moved. , And the base of the hammer body is rotatably mounted on the opposite side or the same side of the keyboard portion with respect to the holding point of the keyboard body, and a beak-shaped projection is attached to the base end of the hammer body. The escapement member which is constantly urged toward the beak-shaped projection of the hammer body has an engaging step portion formed thereon, and the shaft attachment portion of the hammer body is attached to the keyboard by a key operation of the keyboard portion. An action mechanism configured to rotate following the movement of the body, wherein the beak-shaped projection of the hammer engages with the engagement step of the escapement member, and the hammer rotates. And at least one of the escapement members With the operation, a pushing member that pushes the escapement member to the opposite side with respect to the hammer body and disengages the beak-shaped protruding piece of the hammer from the engaging step portion is provided, and a rotating member capable of engaging and disengaging with the hammer body Is provided rotatably with respect to the escapement member, and a biasing means for biasing the rotating member in a predetermined direction is provided. The hammer body which has returned after the rotating operation is locked by the rotating member. The joint portion can be re-engaged with the beak-shaped projection as soon as possible.

For this reason, in the present invention, it is possible to design the height and depth of the action mechanism portion to be small while suppressing the displacement of the hitting position, and to maintain the advantage that the number of parts and the number of assembling steps can be reduced. Function) can be improved.

That is, since the base of the hammer body is directly rotatably provided on the keyboard body, the displacement of the hitting position can be suppressed, and the vertical height of the action mechanism can be reduced. In addition, with at least one of the hammer body and the escapement member, the escapement member is pushed out to the opposite side to the hammer body, and the beak-shaped protruding piece of the hammer body is engaged with the hammer body in accordance with the impact rotation operation of the hammer body. Since the extruding member is detached from the escapement member, the beak-shaped projection of the hammer body can be forcibly detached from the engaging step of the escapement member. Therefore, a member such as a support rod 375 for increasing the horizontal (keyboard direction) movement component of the beak-shaped protruding piece 379 (see FIG. 29) as in the related art is not required, and the length of the keyboard body is also reduced. Since the action mechanism can be designed, the height and depth of the action mechanism can be designed to be extremely small. Further, since a rotating member is provided to accelerate the re-engagement of the beak-shaped projecting piece of the hammer and the engaging step of the escapement member, repetition (continuous hitting function) is improved and continuous hitting is possible.

Another aspect of the present invention provides, in addition to the action mechanism of the above-described invention, a hammer body that is opposed to a hammer body so that the beak-shaped protruding piece is detached from the engaging step portion. The escapement member is provided with a restraining member that stops at a distance from the highest moving position.

As described above, the restraining member for stopping the hammer body away from the sound source body or the highest rotation position in a state where the beak-shaped protruding piece is separated from the engaging step portion so as to freely contact and separate from the hammer body. Since it is formed on the escapement member, the back check 389 (see FIG. 28) in the conventional example becomes unnecessary, and the number of parts and the number of assembling steps can be reduced. In addition, the vertical height of the action mechanism can be reduced.

An action mechanism according to another aspect of the present invention has a keyboard at one end and a swingable keyboard body which is held at an intermediate portion in the longitudinal direction or at the other end, and which holds the keyboard body. A hammer body having its base portion rotatably fixed to the side opposite to or in the same direction as the keyboard portion across the point, and a hammer body having a hammer section, and an escapement member constantly biased toward the hammer body. A protrusion is provided on the opposite side of the hammer portion with respect to the rotation fulcrum of the hammer body, and the escapement member is provided with an engagement step portion that engages with the protrusion, and the key operation of the keyboard portion is performed. An action mechanism configured such that when the rotation fulcrum of the hammer body rotates in the striking direction, the projecting piece of the hammer body engages with the engaging step of the escapement member, and the hammer body rotates. In the above, the rotating member that can be And a biasing means for rotatably mounting the rotating member in a predetermined direction, locking the hammer body that has returned after the rotating operation by the rotating member, and The part can be re-engaged with the protruding piece early.

With this configuration, the vertical height and depth of the action mechanism can be designed to be small while suppressing the displacement of the hitting position, and the repetition can be achieved while maintaining the advantages that the number of parts and the number of assembly steps can be reduced. (Continuous hitting function) can be improved. That is, since the base of the hammer body is directly rotatably provided on the keyboard body, the displacement of the hitting position can be suppressed, and the vertical height of the action mechanism can be reduced. Also,
Since the escapement member is provided with a rotating member that accelerates re-engagement of the projecting piece of the hammer and the engagement step portion of the escapement member, repetition (continuous hitting function) is improved and continuous hitting is possible.

According to another aspect of the present invention, in addition to the action mechanism of the above-described invention, at least one of the hammer body and the escapement member has the escapement member opposed to the hammer body in accordance with the rotation of the hammer body. An extruding member is provided for extruding the protrusion of the hammer body from the engaging step so as to be pushed out to the side.

As described above, at least one of the end of the hammer body and the escapement member, the escapement member is pushed out to the opposite side with respect to the hammer body in accordance with the impact rotation operation of the hammer body. Since the extruding member for detaching the projecting piece of the body from the engaging step is provided, the projecting piece of the hammer can be forcibly detached from the engaging step of the escapement member. Therefore, unlike the related art, a member such as the support rod 375 for increasing the horizontal movement component (keyboard direction) of the beak-shaped projection 379 can be eliminated or reduced, and the length of the keyboard body can be designed to be short. The height and depth of the action mechanism can be designed to be extremely small.

In another invention, in addition to the action mechanism of each of the above-described inventions, when the hammer body starts rotating,
The pivoting member rotates together with the escapement member against the urging force of the urging means to extend, and immediately before the hammer strikes the sound source body or immediately before the pivoting maximum position, the pivoting member is a keyboard body. Following the above movement, the rotation of the escapement member is further stopped even after the rotation of the escapement member is stopped, and the urging means is further compressed.

With this configuration, at the beginning of rotation of the hammer body, the rotating member rotates integrally with the escapement member, and immediately before hitting the sound source body or the like, only the rotating member is rotated. It can be further rotated. For this reason, the escapement member does not rotate to the return side immediately after the impact or the like,
The rotation of the hammer body can be prevented by the rotating member, and the re-engagement between the engaging step of the escapement and the projecting piece of the hammer body can be performed reliably and quickly.

Further, according to another aspect of the present invention, in addition to the action mechanism of each of the above-mentioned inventions, the turning member is provided with a cylindrical blocking portion for preventing the hammer from returning. An engaging / disengaging portion is provided which engages with the blocking portion and prevents the return operation. As described above, since the rotating member is provided with the cylindrical blocking portion, the engaging and disengaging portion of the hammer body can be smoothly engaged with and disengaged from the blocking portion.

In addition, in another invention, in addition to the action mechanism of each of the above-mentioned inventions, a part of the rotating member is interposed between the biasing means and the escapement member to rotate the biasing force of the biasing means. The escapement member is transmitted to the escapement member via the moving member, and the escapement member is constantly biased toward the hammer body. With such a configuration, the biasing means is
And the number of parts does not increase. Further, the arrangement of the rotating member and the escapement member can be made compact.

The keyboard instrument of the present invention has the action mechanism of any one of the above-mentioned inventions. For this reason, it is possible to provide a keyboard instrument in which the vertical height and depth of the action mechanism portion are reduced while suppressing the displacement of the hitting position, and while maintaining the advantage that the number of parts and the number of assembly steps can be reduced, the repetition (continuous hitting function) ) Can be improved. That is, since the base of the hammer body is directly rotatably provided on the keyboard body, the displacement of the hitting position can be suppressed, and the vertical height of the action mechanism can be reduced.
In addition, since the escapement member is provided with a rotating member that hasten the re-engagement of the projecting piece of the hammer and the engagement step of the escapement member, a keyboard instrument with improved repetition (continuous tapping function) can be provided. .

[0069]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, the first
The embodiment will be described with reference to FIGS. In the following, only the action mechanism portion of the keyboard instrument will be described, and the description of the overall structure of the keyboard instrument will be omitted.

The action mechanism 1 has basically the same configuration as the action mechanisms 501 and 601 described above. The main difference is a portion added to improve repetition (continuous hitting function).

As shown in FIG. 1, the action mechanism 1 has a keyboard 2 at one end and a swingable keyboard 3 having an intermediate portion in the longitudinal direction and a swingable keyboard. A hammer for striking a string 5 serving as a sound source body, with its base portion rotatably fixed to a side opposite to the keyboard portion 2 with a pin 4 serving as a holding point of the swinging center point interposed therebetween. A hammer body 7 having a portion 6, an escapement member 9 constantly biased by a coil spring 8 acting as a biasing means toward the hammer body 7, and a rotating member 10 for improving repetition (continuous hitting function). Have.

The keyboard 3 is set on the machine base 11. The machine base 11 includes a pedestal 12, a keyboard position regulating rod 13 fixed to the pedestal 12 and having an oval cross section, and a cushion portion 1 made of a disc-shaped felt and the like placed on the pedestal 12.
4 are provided. The keyboard position regulating rod 13 enters a slot-like groove 15 provided in the keyboard body 3 to regulate the lateral position of the keyboard body 3. The groove 1
Reference numeral 5 denotes an upper portion and a front surface (on the side of the player) of which the keyboard portion 2 is closed.

The pedestal 11 is further provided with a pedestal 16. On the pedestal 16, a support portion 17 having a semicircular cross section crosses the keyboard 3 in order to facilitate swinging of the keyboard 3. Are located. A cushion 18 made of felt or the like is placed on the support 17. Support part 1
The pin 4 inserted into and fixed to 7 has a columnar shape having a circular cross section, and is inserted into a fan-shaped hole 19 which is a hole provided in the keyboard body 3 and whose length in the longitudinal direction becomes longer toward the top. I have. As a result, the keyboard body 3 is
Can be swung about the contact portion with the fulcrum.

Above the machine base 11, a mounting base 22 for rotatably supporting one end of the escapement member 9 and screwing a spring holding member 21 for holding one end of the coil spring 8, and a keyboard body 3. Is fixed to a pedestal 24 on which a cushion material 23 made of felt with which the rear end abuts is placed. The pedestals 12, 16, 24
Is attached to the machine base 11, and the mounting base 22 is
To the machine base 11. The adjustment of the coil spring 8 is performed by the degree of screwing of the spring holding member 21.

In addition to the hammer part 6, the hammer body 7
As shown in the figure, a beak-shaped projection 31, an extrusion projection 32 serving as an extrusion member, and a lever-shaped engagement / disengagement portion 3 which engages / disengages with the rotating member 10.
3, a spring engaging portion 35 (see FIG. 2) for engaging one end of a hammer spring 34 for assisting the return operation of the hammer body 7, and the pushing protrusion 3 provided at the tip of the pushing protrusion 32.
A sliding portion 37 made of leather or the like which is a part of the engaging and disengaging portion 33 provided at a portion of the engaging and disengaging portion 33 which comes into contact with the rotating member 10; A hole 39 into which the screws 38 are inserted is provided.
The set screws 38, 38 are provided in holes 3 provided in the keyboard body 3.
c, so that the hammer 7 can be turned with respect to the keyboard 3. The place where the set screw 38 is attached is referred to as the base of the hammer 7.

The hammer 7 is rotatably attached to the keyboard 3 by means of screws 38, 38 and washers 40.
At this time, the other end of the hammer spring 34 is hooked on the string 3 a attached to the keyboard 3. The keyboard 3 also includes a base 3b on which a part of the rotating member 10 is placed,
A hole 3c through which the set screw 38 passes is provided.

The escapement member 9 is a part of an engaging step 41 that engages with the projection 31 of the hammer body 7 and a part of a restraining member made of felt or the like that comes into contact with the back surface of the extrusion protrusion 32 of the hammer body 7. The suppressing portion 42, an adjusting screw 43 for adjusting a let-off for adjusting a position where the cushion portion 36 of the pushing protrusion 32 abuts, and an urging force receiving portion 44 which receives the urging force of the coil spring 8 via the rotating member 10. And a hole (not shown) for inserting the mounting shaft 45.

The escapement member 9 further includes
As shown in FIG. 8, a turning member angle adjusting screw 46 for adjusting the turning position relationship with the turning member 10, a suppressing member 47 to which the suppressing portion 42 is fixed, and an escapement body 48 And a sliding member 51 made of leather or the like adhered to the engaging step portion 41 and serving as a part of the engaging step portion 41. In addition, the escapement main body 48 is provided with a concave portion 52 into which the engaging / disengaging portion 33 of the hammer body 7 enters, and a screw hole 53 with which the turning member angle adjusting screw 46 is engaged.

The escapement member 9 has a rotating member 10 for improving repetition (continuous hitting function).
Is provided so as to be rotatable about a shaft 61 passing through the escapement member 9 and the rotating member 10.

As shown in FIGS. 4 and 5, the rotating member 10 is provided with an urging force receiving portion 44 of the escapement member 9.
A cylindrical roller 63 serving as a blocking portion for engaging and disengaging the engaging / disengaging portion 33 of the hammer body 7 and for preventing the hammer body 7 from returning. A roller support rod 64 mounted on the base 3b of the keyboard body 3 from a predetermined time due to the rotation of the hammer body 7, a cushion portion 65 made of leather or the like against which the tip of the rotation member angle adjusting screw 46 abuts; The pedestal 66 includes a pedestal 66 receiving the urging force of the spring 8 and a spring receiver 67 in which a head 67a is arranged in the internal space of the pedestal 66 having a triangular cross section.

The roller support rod 64 has a small-diameter portion 71 part of which is made thinner.
3 is inserted through a center hole 72 provided at the center of the third. With this configuration, the roller 63 can rotate around the small diameter portion 71. In addition, holes 73, 73 for inserting the shaft 61 are provided at substantially the centers of the side portions 62, 62.

The operation of the action mechanism 1 according to the first embodiment configured as described above will be described with reference to FIGS. Each drawing is a partially enlarged view showing the relationship between the hammer body 7, the escapement member 9, and the rotating member 10, and a partially enlarged view around the beak-shaped protruding piece 31 of the hammer body 7.

First, FIGS. 6 and 7 show a stationary state before the keyboard portion 2 is depressed. In the state of the stationary view, the rotating member 10 provided with the roller 63 by the action of the rotating member angle adjusting screw 46 maintains a constant angle with the escapement member 9. Therefore, the engaging / disengaging portion 33 extending from the base of the hammer body 7 is separated from the roller 63 (FIG. 7).
reference).

When the keyboard portion 2 is depressed, as shown in FIG. 8, the entire rear portion of the keyboard body 3 starts to rise, and the hammer body 7 starts rotating with respect to the keyboard body 3. Approaching. This is because the projecting piece 31 is suppressed by the engaging step 41 when the set screw 38 starts to rise,
This is because the hammer 6 rotates around the set screw 38.

When the keyboard portion 2 is depressed, the lever-shaped engaging / disengaging portion 33 extending from the base of the hammer 7 and the roller 63 gradually approach as shown in FIG. Rotating member 1
The zero roller support bar 64 approaches the base 3b installed on the keyboard 3. Further, the coil spring 8 is compressed as the escapement member 9 is inclined by being pushed by the adjusting screw 43 for let-off adjustment. FIG.
9 shows a state in which the keyboard portion 2 of the keyboard position regulating rod 13 has been pressed down by 2 mm. The length that can be pushed down is 8 mm in this embodiment.

Further, when the keyboard 2 is pushed down (depth of 3.8 mm), the beak-shaped projecting piece 31 reaches the curved surface of the engaging step 41 as shown in FIGS. 10 and 11. At this time, the hammer 6 is further rotated, and is closer to the string 5. At this point, as shown in FIG. 11, the sliding portion 37 on the upper surface of the engaging / disengaging portion 33 and the roller 63 come into contact with each other, and the roller support rod 64 and the base 3b of the keyboard 3 come into contact with each other. That is, so that these two contacts occur simultaneously,
The angle between the rotating member 10 and the escapement member 9 is adjusted in advance by the rotating member angle adjusting screw 46.

When the keyboard 2 is further depressed, the hammer 7 is further raised, and the hammer 6 is turned and approaches the string 5. At this time, as shown in FIG.
4 rides on the base 3b installed on the keyboard 3, and thereafter, as long as the roller support bar 64 rides on the base 3b, the roller support rod 64 moves upward as the rear of the keyboard 3 rises. Then, the engagement / disengagement portion 33 and the roller 63 start to separate again.

At this time, when the roller support rod 64 is pushed up from the base 3b, the rotating member 10
In 2 start rotating clockwise. Thereby, the coil spring 8 is compressed by the rotation of the rotating member 10 in addition to the change in the angle of the escapement member 9. Thus, the coil spring 8 is compressed in two stages. The angle change of the escapement member 9 changes about 10 degrees until the keyboard portion 2 is pushed down to about half the depth and the tip of the beak-shaped protruding piece 31 reaches the curved surface portion of the engagement step portion 41, After the tip of the protruding piece 31 reaches the curved surface portion of the engaging step portion 41, the change becomes small, and changes only about 3 degrees by the time of striking the keyboard portion 2 in a state where the keyboard portion 2 is pressed down to the maximum depth. .

On the other hand, the compression of the coil spring 8 due to the rotation of the rotating member 10 starts when the tip of the beak-shaped protruding piece 31 approaches the curved surface of the engaging step 41 and continues until the string is struck. The angle change at this time is about 7 degrees. When the rotating member 10 starts rotating, the rotating member angle adjusting screw 4
A gap is formed between the cushion member 6 and the cushion portion 65 which is a contact surface of the rotating member 10. Note that the depression depth of the keyboard portion 2 in FIGS. 12 and 13 is 5 mm.

As shown in FIGS. 14 and 15, when the strings are struck, the rear of the keyboard 3 rises to the highest position, and the hammer 6 also reaches the highest turning position. Further, the position of the roller 63 also has the maximum height. The height of the base 3b installed on the keyboard 3 is adjusted so that this height is the same as the height at which the top surface of the tip of the protruding piece 31 rises at the time of the next hammer stop. Therefore, FIG. 16 and FIG.
When the hammer stops as shown in (1), even if the top surface of the tip of the protruding piece 31 rises, it does not become an obstacle, so that the hammer body 7 after striking can be rotated to the hammer stop position without any trouble.

At the time of string striking, as shown in FIG. 14, the coil spring 8 is strongly pressed by the rotating member 10 and compressed. In FIG. 14, the tip of the hammer 6 faces the string 5 face-to-face when the string is struck,
Although the entire tip is illustrated as contacting the string 5,
Actually, the string 5 is stretched at an angle with respect to the longitudinal direction of the keyboard body 3, so that the string 5 comes into contact with one point at the tip.

After striking the string, the keyboard 2 continues to be located at the lowest position, but the hammer 7 returns to its original position due to the repulsive force of the string 5 and the structure described below. That is, as shown in FIG. 15, since the gap L exists between the roller 63 and the engagement / disengagement portion 33, the hammer body 7 is not obstructed by the roller 63 from rotating as shown in FIG. It returns to the hammer stop position by the weight of the hammer 6 and the repulsive force of the string 5. At the position of the hammer stop, the back surface of the extrusion protrusion 32 abuts on the suppressing portion 42, and the return operation is prevented.
Also, as shown in FIG.
(Actually, the sliding portion 37 which is a part of the engagement / disengagement portion 33), and the hammer body 7 is also prevented from returning to its original position at this portion. Even during this contact, the roller support bar 64 and the base 3b remain in contact.

The hammer spring 34 attached to the hammer body 7 allows the hammer body 7 to return (from the string striking to the hammer stop, rotating the hammer body 7 in a direction opposite to the direction in which the hammer body rotates at the time of string striking). "Return of the hammer".) This hammer spring 3
The string 4 is pulled by the string 3a attached to the keyboard 3, and is deformed at the time of string striking so as to maximize its effect (elasticity).

When the hammer spring 34 is struck extremely weakly, the return of the hammer 7 becomes poor due to friction between the lower surface of the tip of the beak-shaped protruding piece 31 and the curved surface of the engaging step 41, or the keyboard body In order to prevent the return of the hammer 7 from being deteriorated when the device 3 is used in a state other than the state in which the surface of the device 3 faces upward, it is attached.

After the stop of the hammer, the pressing force of the keyboard portion 2 is released and the keyboard portion 2 is raised, and the rear portion of the keyboard 3 descends, and the hammer portion 6 moves away from the string 5 (see FIG. 18). ). At the same time, the back surface of the extrusion protrusion 32 moves away from the suppressing portion 42. Since the position of the base 3b supporting the roller support bar 64 is lowered, the rotating member 10 rotates accordingly, and the roller 63 lowers its position.
At this time, the roller 63 has a function of pressing down the lever-shaped engaging / disengaging portion 33 extending from the hammer body 7 by the force of the coil spring 8 compressed by the rotation of the rotating member 10.

Since the engaging and disengaging portion 33 of the hammer 7 cannot push up the roller 63 against the downward pressing force, the engaging and disengaging portion 33 and the roller 63, the roller support rod 64, and the base 3b of the keyboard 3 can be used. Are lowered simultaneously with the lowering of the rear part of the keyboard body 3 in the state of contact at the same time. This continuation of the contact state is continued from the state in which the keyboard portion 2 is depressed at a depth of 6.5 mm in FIGS. 18 and 19, and the state in which the depression depth is 5 mm in FIGS. 20 and 21.

In the process shown in FIGS. 10 and 11, that is, in the process of pushing down the keyboard portion 2 for striking the strings, the engagement / disengagement portion 33 and the roller 63, the roller support rod 64 and the base portion 3 b of the keyboard body 3 are moved. When the hammer 7 descends along with the lowering of the keyboard body 3 to the position where it contacts simultaneously, the tip of the protruding piece 31 is
11 is pushed down along the curved surface of the engaging step 41 until the tip of the projecting piece 31 reaches the curved surface of the engaging step 41. For this reason, the keyboard portion 2 can be depressed again to hit a string before the front portion of the keyboard body 3 reaches the highest position, that is, before the stationary state.

As a result, a repetition of quicker continuous hits can be performed. In the above-described embodiment, the depressable amount of the keyboard portion 2 is set to 8 mm, and the remaining key depth is 3.8 mm, that is, 4.2 m from the completion of the depression.
The key operation can be performed again after returning to m. However, the actual model produced from each figure gave better results. As an example of specific numerical values, the adjusted amount of the keyboard part 2 is 8 mm as a result of adjusting the manufactured model.
In this case, the key operation can be performed again at the point of returning 3.8 mm from the completion of the pressing. With further improvements, it may be possible to perform the keying operation again at an earlier point in time. If re-keying is possible with less than half of the depression amount, re-keying operation becomes possible before the damper for suppressing the vibration of the string 5 when the keyboard body 3 used in the piano starts to work, and it is extremely practical. It will be preferable.

Next, the layout relationship of the keyboard 3 when the action mechanism 1 performing such an operation is incorporated into an actual keyboard instrument will be described with reference to FIG.

FIG. 22 is a plan view showing the state where the hammer 7 and the escapement member 9 arranged on the keyboard 3 are removed (the string 3a and the base 3b are also omitted). FIG. 22 exemplarily shows three CDE sounds and a semitone part therebetween. As shown in FIG. 22, the presence of the semitone part causes the pin 4 to be a pivot point of the keyboard body 3.
Are arranged in two rows in a staggered arrangement, and the keyboard position regulating rods 13 of the keyboard portion 2 are also arranged in a staggered arrangement.
It is arranged in columns. The shapes of the keyboards 3 are all different except that the two semitone parts are identical to each other. However, the basic configuration of each keyboard body 3 is exactly the same as the configuration shown in FIGS.

Next, a keyboard instrument according to a second embodiment of the present invention will be described with reference to FIG. Also in the second embodiment, only the action mechanism will be described.
A description of the entire instrument will be omitted. The same members as those of the action mechanism 1 described above are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The action mechanism 101 employed in the keyboard instrument according to the second embodiment is different from the action mechanism 1 in that the strings 5 are arranged below the keyboard 3 and the hammer 7 and the escapement member 9 The rotation member 10 is disposed on the keyboard 2 side with respect to the pin 4 serving as a swing fulcrum. FIG. 23 shows a keyboard body 111 serving as a black key in addition to the keyboard body 3 serving as a white key. The keyboard body 111 is
It swings with the pin 112 as a fulcrum. A support portion 113 fixed to the pedestal 16 is provided between the keyboard body 111 and the pedestal 16.
And a cushion material 114 placed on the support 113
Are arranged.

The machine base 102 includes an upper machine base 102a to which the mounting base 22 and the pedestal 103 are attached, a left machine base 102b to which the pedestal 16 to which the pin 4 is attached is fixed, and a right machine to which the pedestal 12 is attached. It is composed of a base 102c and the like. The pedestal 103 has a black key body 111 (keyboard 3
A pin 104 for regulating the position of a portion (rear end portion) opposite to the keyboard portion across the pin 112 serving as a swing fulcrum is provided, and the pedestal 103 and the black key are provided. A cushion member 105 made of felt or the like is provided between the keyboard member 111 and the keyboard body 111.

When the keyboard 2 is depressed, the hammer 7
Will strike the string 5. The operations of the hammer 7, the coil spring 8, the escapement member 9, and the rotating member 10 at this time are the same as those of the action mechanism 1 of the first embodiment.

Next, a keyboard instrument according to a third embodiment of the present invention will be described with reference to FIG. Also in the third embodiment, only the action mechanism will be described.
A description of the entire instrument will be omitted. The same members as those of the action mechanism 1 described above are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The action mechanism 201 employed in the keyboard instrument according to the third embodiment differs from the action mechanism 1 in that the strings 5 are arranged below the keyboard body 3 and the hammer body 7 and the escapement member 9 The rotation member 10 is disposed on the keyboard 2 side with respect to the pin 4 serving as a swing fulcrum. FIG. 25 shows a keyboard body 211 serving as a black key in addition to the keyboard body 3 serving as a white key. The keyboard body 211 also
It swings with the pin 4 at another position as a fulcrum. Note that the escapement member 9 and the rotating member 10 in the case of a black key are
5 is arranged at a position closer to the pin 4 side.

Between the keyboard bodies 3, 211 and the pedestal 16,
A regulating part 213 fixed to the base 16;
The cushion material 214 placed on the keyboard body 3, 21
1 and a coil spring 215 for keeping the stationary state. The restricting portion 213 has a concave cross section,
Each of the keyboard bodies 3 and 211 is inserted one by one into each of the concave portions, and the position is regulated.

The machine base 202 includes an upper machine base 202a for mounting the mounting base 22, the pedestal 203, and the rail-shaped member 204.
And a left machine base 202b to which the pedestal 16 to which the pin 4 is attached is fixed, and a right machine base 202c to which the pedestal 12 is attached. On the pedestal 203, an adjusting screw 205 for adjusting and aligning the height of the tip of the keyboard body 3, 211 is arranged, and the adjusting screw 205 and each of the keyboard bodies 3, 211 are arranged.
Cushion 20 made of felt or the like between 211 and
6 are provided. In addition, the rail-shaped member 204 holds the other end of the pin 4 serving as a swing fulcrum via a cushion member 207, and prevents the keyboard bodies 3 and 211 from lifting.

In the keyboard musical instrument according to the third embodiment, the restricting portions 213 are provided below the pins 4 serving as fulcrums of the keyboard bodies 3 and 211 so as to sandwich the keyboard bodies 3 and 211 from both sides.
There is no guide pin at the front end of the keyboard 3,211. The positions of the pins 4 serving as fulcrums of the keyboard bodies 3 and 211 are the same as those of the white key body 3 and the black key body 211 as viewed from the side. The positions of the hammer body 7, the escapement member 9, the pivoting member 10, and the like are shifted in the length direction by the white key and the black key as described above. In FIG. Omitted.

When the keyboard 2 is depressed, the hammer 7
Will strike the string 5. The operations of the hammer 7, the coil spring 8, the escapement member 9, and the rotating member 10 at this time are the same as those of the action mechanism 1 of the first embodiment.

In the third embodiment, the first and second embodiments are mainly built in the musical instrument main body, whereas the third embodiment has a string 5 or the like. Of course, it is possible to produce a musical instrument having the above-mentioned sound source body, but it is also possible to produce it as a device having no sound source body. For example, a sound source body such as a string or a metal plate, such as a guitar or a metal harp, is exposed. , Which can be used as a keyboard instrument.

In the third embodiment, the escapement member 9 and the hammer 7 are arranged 180 degrees symmetrically with respect to a virtual center line drawn up and down the center.
The hammer 7 may be configured to collide with the hammer 7 from one side of the vertically arranged metal plate 603 as shown in FIG. Further, with respect to the third embodiment and the above-described second embodiment, a configuration may be adopted in which a mechanism for improving repetition is not added.

Although the above embodiments are examples of preferred embodiments of the present invention, the present invention is not limited to these embodiments, and various modifications may be made without departing from the spirit of the present invention. Changes can be made. For example, as shown in FIG. 26, the keyboard body 3 may be provided with a set screw 38 so as to protrude to the side where the entire length is one plane. Note that the keyboard body 3 has a width W1 of about 10 mm. This width W1 is the same as the width of the keyboard portion 2 of the semitone portion, and is the basis of the keyboard body 3 in the width direction.

The structure of the keyboard 3 may be as shown in FIG. The keyboard body 253 shown in FIG. 27 is preferably applied to a keyboard instrument using a general-sized keyboard. In this keyboard body 253, a portion corresponding to the set screw 38 becomes a bridging-shaped rotation center portion 254, and the rotation center portion 254 traverses two tip portions 255 and 255 that form a bifurcated structure together. It is hanging. This keyboard 2
In 53, the hammer body 7 and the escapement member 9 are disposed between the two front ends 255 and 255, and the hammer body 7
Is rotatably attached to the rotation center 254.

The hammer body 7 is preferably made of wood, but may be made of another material such as synthetic resin. Also,
The tip of the hammer 6 of the hammer 7 may be made of the same material as that of the first embodiment, but if it is desired to adjust the sound quality, the tip made of leather or felt is bonded. It may be fixed. Further, a coated front end portion that covers both side surfaces of the front end may be used. Further, rubber may be attached to the tip of the hammer portion 6 of the hammer body 7.

In order to devise the shape of the tip of the hammer 6 or to attach a member such as leather, felt, rubber, or the like to the tip of the hammer 6, the engagement step 4 with which the beak-shaped protrusion 31 abuts is used.
The same can be applied to the portion 1. As shown in FIG. 28, the shape of the hammer 7 is as follows.
The hammer 6 may be lengthened to provide a space S between the hammer 6 and the extrusion protrusion 32, and another component such as a fixing portion as a suppressing member described later may be disposed in the space S.

Further, in each of the above-described embodiments, a portable keyboard instrument is intended. However, a large keyboard instrument such as an electronic organ, an upright piano, a grand piano and the like which is arranged in a house may be used. .

In the keyboard instruments according to the above-described embodiments, when a sound damping device (damper) of a sound source body is added to each of the action mechanisms 1, 101, 201, a method used for a conventional keyboard instrument is used. Can be adopted as it is. Further, the suppressing member 47 may be attached to a fixing member fixed to the machine base 11. Further, although the restraint member 47 attached to the escapement member 9 and the restraint member 47 fixed to the machine base 11 are removed, the operation is performed. However, since the hammer body 7 rebounds, the operation is not stable and it is difficult to repeatedly hit. Become. However, it can be used as a toy or a musical instrument for infants even if the suppression member 47 is removed.

Further, in each of the embodiments and the modified examples,
The arrangement surface of the keyboard portion 2 and the arrangement surface of the strings 5 were parallel to each other, and the entire keyboard instrument was configured in a flat shape. However, the hammer body 7 in the present invention was bent upward at substantially right angles from the arm portion corresponding to the handle. By making the shape, that is, FIG. 28 and FIG.
In this configuration, the strings 5 and the like can be arranged in a direction orthogonal to the keyboard portion 2 (the surface facing the player) to provide an upright piano-type keyboard instrument. A shaft 423 is provided at the rear of the keyboard body 405 as shown in FIG.
Is provided, and the escapement member 411 is provided at the rear end.

In each of the embodiments, the string 5 is used as the sound source. However, the sound source according to the present invention may use other materials such as a metal plate 603, glass, and a bell. good. Further, as the shape and structure of the hammer body 7, various conventionally known ones can be adopted. Further, although the extrusion protrusion 32 serving as the extrusion member is provided on the hammer body 7, the adjustment screw 43 provided on the escapement member 9 is provided.
Is also a kind of extrusion protrusion, and the extrusion member may be provided on at least one of the hammer body 7 and the escapement member 9. In addition, the push-out member may not be provided by slightly sacrificing the let-off performance or by improving the positional accuracy of the protruding piece 31 and the engaging step 41.

Further, each of the action mechanisms 1 and 10 of the present invention
In Nos. 1 and 201, since the feel of playing the hammer body 7 (let-off) is exactly the same as that of a general piano, a silent keyboard for practice can be obtained by using a cushion in place of the sounding body as a sound source body. It is also possible to apply the present invention to an electronic musical instrument by applying a sensor of the electronic musical instrument instead of the sounding body, and such a configuration also belongs to the scope of the present invention. .

When the present invention is applied to an electronic musical instrument, a sensor for playing electronic music is arranged at the string striking portion, or the operation speed is detected by a speed sensor arranged near the keyboard portion 2 to detect the string striking. It is preferable to detect the speed and change the playing intensity. By doing so, it becomes a kind of real touch keyboard, and while being an electronic musical instrument, a mechanic feeling can be obtained.

Further, other biasing means such as a rubber member instead of the coil spring 8 or a metal disc spring may be employed. Further, in each embodiment,
Although the engaging step portion 41 has a projecting shape, it has a concave shape,
The upper inner surface of the recess may have the same function as the lower surface of the engaging step portion 41. Also, two coil springs 8 as urging means are provided instead of one,
A dedicated coil spring may be assigned for rotation of only 0.

Further, many of the improvements of the present invention are not limited to the configuration in which the hammer 7 is directly attached to the keyboard 3, but the configuration in which the hammer 377 is attached to the support rod 375 as in the prior art. It can be applied to things. The action mechanisms 1 and 101 can be applied not only to musical instruments such as keyboard instruments, but also to various other devices such as continuous on / off of an electromagnetic relay and an action portion of a game device.

[0125]

As described above, the action mechanism and the keyboard instrument according to the present invention can be designed to reduce the vertical height and depth of the action mechanism portion while suppressing the displacement of the hitting position, and to reduce the number of parts and the number of assembly steps. The repetition (continuous hitting function) can be improved while maintaining the advantage of being able to do so.

Note that the keyboard instrument employing this mechanism can stabilize the tone and improve the performance quality even in the flip-up type because the displacement of the striking position is reduced. Rather, it can be used as a keyboard instrument for concerts performed by professionals. In addition, the action mechanism is small in height and depth, and can be easily manufactured as a portable keyboard instrument. further,
Repetition (repeat function)
, So that high quality performances can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing an action mechanism used for a keyboard instrument according to a first embodiment of the present invention.

FIG. 2 is a side view of the action mechanism of FIG. 1 as viewed from the opposite side.

FIG. 3 is a partially exploded perspective view showing a relationship between a hammer body and a keyboard body in the action mechanism of FIG. 1;

FIG. 4 is a partially exploded perspective view illustrating a relationship between an escapement member and a rotating member in the action mechanism of FIG. 1;

FIG. 5 is a perspective view of a rotating member in the action mechanism of FIG. 1 and a perspective view showing each part.

6 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of a hammer body and a periphery of the hammer body in a stationary state.

FIG. 7 is a view for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engaging step in a stationary state.

FIG. 8 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the hammer body and the vicinity of the hammer body in a state where the keyboard is slightly depressed.

9 is a view for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engagement step in a state where the keyboard is slightly pressed down.

FIG. 10 is a view for explaining the operation of the action mechanism of FIG. 1; the hammer in a state in which the keyboard portion is further depressed and the beak-shaped projection of the hammer body reaches the curved surface of the engaging step of the escapement member; It is the elements on larger scale around a body and a hammer body.

FIG. 11 is a view for explaining the operation of the action mechanism of FIG. 1; the beak in a state in which the keyboard portion is further depressed and the beak-shaped projection of the hammer body reaches the curved surface of the engaging step of the escapement member; It is the elements on larger scale of the periphery of a convex piece and an engagement step part.

FIG. 12 is a view for explaining the operation of the action mechanism of FIG. 1; the keyboard is further pushed down, the roller support rod of the rotating member rides on the base of the keyboard, and the rotating member follows the movement of the keyboard. FIG. 4 is a partially enlarged view of a hammer body and a periphery of the hammer body in a state where the hammer body is in a state of being moved.

FIG. 13 is a view for explaining the operation of the action mechanism of FIG. 1, wherein the keyboard portion is further pushed down, the roller support rod of the rotating member rides on the base of the keyboard body, and the rotating member follows the movement of the keyboard body. FIG. 4 is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engagement step portion in a state where the protrusion is formed.

FIG. 14 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of a hammer body and a periphery of the hammer body at the time of string striking.

FIG. 15 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engaging step at the time of string striking.

FIG. 16 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the hammer body and the periphery of the hammer body in a state where the hammer body has reached the hammer stop position by the hammer return operation.

FIG. 17 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the periphery of the beak-shaped protruding piece and the engaging step in a state where the hammer body has reached the hammer stop position by the hammer return operation. is there.

FIG. 18 is a view for explaining the operation of the action mechanism of FIG. 1; the hammer body and a portion around the hammer body in a state where the hammer body starts to return downward from the hammer stop position by the keyboard part starting to return to the original position; It is an enlarged view.

FIG. 19 is a view for explaining the operation of the action mechanism of FIG. 1 and engages with a beak-shaped protruding piece in a state in which the hammer body starts to return downward from the hammer stop position when the keyboard starts to return to its original position. It is the elements on larger scale of the periphery of a step part.

20 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the hammer body and the vicinity of the hammer body immediately before a re-stringable position.

FIG. 21 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engaging step just before a re-stringable position.

FIG. 22 is a plan view of the action mechanism shown in FIG. 1 in a state where components disposed above a keyboard body and members such as a hammer body and an escapement member have been removed;

FIG. 23 is a side view showing an action mechanism used in the keyboard instrument of the second embodiment of the present invention.

FIG. 24 is a side view showing an action mechanism used in the keyboard instrument according to the third embodiment of the present invention.

FIG. 25 is a plan view showing a modification of the keyboard in the action mechanism used in the keyboard instrument of the present invention shown in FIG. 1 and the like.

26 is a plan view showing another modified example of the keyboard in the action mechanism used in the keyboard instrument of the present invention shown in FIG. 1 and the like.

FIG. 27 is a view showing a modification of the hammer body in the action mechanism used in the keyboard instrument of the present invention shown in FIG. 1 and the like.

FIG. 28 is a side view showing an action mechanism used in a conventional flip-up keyboard instrument and its operation, and is a side view showing a stationary state immediately before the start of keying.

FIG. 29 is a side view showing a state immediately before string striking in the conventional action mechanism shown in FIG. 28;

30 is a side view showing a state at the time of string striking in the conventional action mechanism shown in FIG. 28.

31 is a side view showing a state in which the hammer body in the conventional action mechanism shown in FIG. 28 is deenergized by backcheck after striking a string.

FIG. 32 is a side view showing an action mechanism used for a keyboard instrument disclosed in Japanese Patent No. 3035826.

FIG. 33 is a perspective view showing a keyboard body and a hammer body in the action mechanism of FIG. 32;

FIG. 34 is a side view showing a main part of the action mechanism of FIG. 32;

FIG. 35 is a side view showing a state immediately before string striking in the action mechanism of FIG. 32;

FIG. 36 is a side view showing a state at the time of string striking in the action mechanism of FIG. 32.

FIG. 37 is a side view showing a state in which the hammer body in the action mechanism of FIG. 32 is stopped by the restraining member after striking a string.

FIG. 38 is a side view showing an action mechanism used in another keyboard instrument disclosed in Japanese Patent No. 3035826.

FIG. 39 is a side view showing an action mechanism used for a keyboard instrument developed earlier by the present inventors.

40 is an enlarged perspective view of a hammer part of the hammer body and a sound source body of the action mechanism of FIG. 39.

41 is a diagram showing the hammer part of the hammer body and the sound source body part of the action mechanism of FIG. 39 in a state of being overlapped from the back surface of the hammer part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Action mechanism 2 Keyboard part 3 Keyboard body 4 Pin (oscillation fulcrum, holding point) 5 String (sound source body) 6 Hammer part 7 Hammer body 8 Coil spring (biasing means) 9 Escapement member 10 Rotating member 31 Protrusion piece (Beak-shaped protruding piece) 32 Extrusion protrusion (extrusion member) 33 Engagement / disengagement part 36 Cushion part (part of extrusion protrusion) 37 Cushion part (part of engagement / disengagement part) 41 Engagement step part 42 Suppression part (of suppression member) 47) Suppression member 51 Sliding material (part of the engaging step) 63 Roller (blocking part)

[Procedure amendment]

[Submission date] March 19, 2002 (2002.3.1)
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document name]

Patent application title: Action mechanism and keyboard musical instrument having the action mechanism

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an action mechanism for striking a sound source or sounding a sounding body in response to a key operation of a keyboard, and a keyboard instrument, and more particularly to an action mechanism called a flip-up type. It is suitable for application to keyboard instruments.

[0002]

2. Description of the Related Art Currently, keyboard instruments that perform hammer actions, such as pianos, are equipped with the same type of action mechanism, although the standards are slightly different. In other words, modern pianos employ a British-style action mechanism called a push-up type.

However, in the 19th century, besides this push-up type, a German or Wien type action mechanism called a flip-up type was widely known as another mechanism. Such past mechanisms and the historical change of the flip-up system described later are described in Walter, 1979 (3rd edition).
It is described in Pfeiffer's "Vom Hammer". Before confirming this material (about 15 years ago), the inventor was interested in this kind of keyboard instrument by seeing a photograph of the musical instrument Orphica, and began producing it. Was.

The basic feature of this flip-up type is that the rotation center axis of the hammer is attached to a key. The most significant advancement of this flip-up action mechanism took place in the 18th century. In other words, Johann Andoreas Stein (1728-1792) used an independent key for each key, instead of the part where the hammer beak behind the fixed rail-shaped key was hooked. A tongue-shaped part was attached to create an outstanding touch. This was the most important advance in flip-up action, and determined the mechanism of flip-up action.

[0005] Stein's action mechanism did not include a backcheck (which stops the movement of the hammer that bounces off the string after striking it). But,
It is Stein's achievement that created the basis for the German action and determined the final form of the flip-up action.

[0006] The world-famous Vienna-style action is
It was taken over by Stein's daughter, Nanette, and keyboard instrument maker and her husband, Johann Andoreas Streicher, further evolving its identity. Therefore, the German-style action was called Wien-style when Stein's daughter Nanette married to Vienna, and the roots are often described together as "German-Wien-style action" because of their roots. You.

[0007] The touch (playing condition) of an improved system in which an independent tongue-shaped part is attached to each Stein's key (for example, see FIG. 27) is very light, and let-off (before the collision of the hammer and the string) with the key. No increase in pressure due to the movement or action of separating the movement of the hammer from the movement of the hammer is felt at all, and it is easy to repeatedly hit. The depth of the key is about 6 mm, and the weight of the key (the number of grams at which the key is lowered) is 30 grams for a low tone and 20 grams for a high tone.

On the other hand, in the current piano, when a key is depressed, there is a considerable resistance at the time of let-off, that is, an increase in the force to push the key back. And the key depth is 9.5-10
mm. Steinway's grand piano is a representative with a small key weight, but averages around 47 grams.

[0009] Although such improvements have been added to flip-up action mechanisms, the trend in the world has been to push-up actions. This is due to the fact that the British-style action, which is a push-up type during this time, has undergone a definitive improvement that is now common sense. It was a repetition action, invented in 1821, and further improved in 1840 to become the current grand piano action.

[0010] In the piano action, once a key is depressed to produce a sound (stringing), the finger must be lifted to raise the key to "a certain height" to prepare for the next stringing. In the repetition action, a mechanism devised to minimize the "a certain height" required to prepare for the string striking as much as possible. With this mechanism, the continuous tapping function can be enhanced (= consecutive tapping can be easily performed).

As far as the inventor knows, upright pianos do not have this function except for two limited models worldwide. Therefore, it is a point of comparison of the playability between the upright piano and the grand piano. This is called "Kurzhubwerk" in German. The meaning is understood as "lifting shortening function".

Furthermore, the flip-up (Vienna) action has a major structural problem. This problem was already noticed by the inventor when he tried to produce a keyboard instrument about 15 years ago, but until recently, this problem was described in this document "Vom Hammer". I didn't notice what was being done. The structural problem of the Wien-type action is that the center axis of rotation of the hammer moves as the key moves. This causes the following inconveniences.

Usually, when striking a string, it is generally assumed that the key is pushed down to the bottom, but it is also possible to strike the key in a different state, for example, momentarily striking the key with a strong force. . In other words, it is a Forte star cart.

[0014] In this case, the hammer jumps up and strikes the string by the recoil of momentarily striking the key with a strong force, but the key is not pushed down to the bottom but is located somewhere in the middle. In the Wien type action, since the rotation center axis of the hammer is attached to the key, the position of the rotation center axis of the hammer at that time is lower than the state where the key is pushed down to the bottom. As a result, in each of the above two states, the position of the rotation center axis of the hammer is different,
The hammer will reach the strings in different trajectories, and the part of the hammer head that swings on the strings will also differ.

The hammer head striking point (point where the string touches)
The deviation occurs in the front-back direction when viewed from the player, so if the strings are stretched side by side so as to intersect the direction in which the key is extending, not only will the target string not be struck due to this deviation, It is possible that another string or a string of a plurality of unnecessary sounds may be struck simultaneously. Also, when looking at the hammer side, the horn comes into contact with the strings at a wide range and at an unspecified point on the top of the hammer, so that the tone becomes unstable and the tone quality cannot be adjusted.

Such a flip-up Wien type action mechanism 373 is shown in FIGS. FIG.
As shown in FIG. 7, a keyboard body 305 having a keyboard portion (not shown) on the right side in the drawing has a longitudinally intermediate portion held by a pin 313 and a pedestal 315 so as to be swingable. A support rod 375 is provided upright at the other end of the keyboard body 305, and a base of a hammer body 377 for striking a string 307 is rotatably supported by a rotation center shaft 378 at the upper end of the support rod 375. ing.

At the base end of the hammer body 377, a beak-shaped projection 3
79 are protrudingly provided. An engagement step 383 is formed on the escapement member 381 which is constantly urged by the spring bar 380 toward the beak-shaped projection 379 of the hammer body 377. On the other hand, the machine frame 385 has a back check 389 along the rotation locus of the hammer portion 387 of the hammer body 377.
A sliding member such as leather is stuck on the surface of the back check 389.

At the time of the performance, as shown in FIGS. 28 and 29, the supporting rod 375 at the other end of the keyboard 305 is raised toward the string 307 and the hammer 377 The beak-shaped protrusion 379 and the engagement step 383 of the escapement member 381 are engaged. Thus, the hammer body 377 performs a striking rotation operation on the string 307.

The engagement between the beak-shaped protrusion 379 of the hammer body 377 and the engagement step 383 of the escapement member 381 is released (let off) as shown in FIG. 29 immediately before the striking operation of the hammer body 377. It is designed to be. The timing of this detachment can be finely adjusted by the adjusting screw 391. When the player releases the keyboard, the detached beak-shaped protruding piece 379 slides down on the return sliding surface 393 of the escapement member 381 as shown in FIG. 30, and returns to the posture shown in FIG. I do. Further, the hammer body 377 after striking the string 307 is strongly returned to the original position direction by the repulsive force of the string 307, but the movement is caused by sliding friction between the hammer portion 387 of the hammer body 377 and the back check 389. And is stopped. Therefore, the hammer body 377
Will not strike string 307 again due to rebound.

The let-off of the Wien-type action mechanism 373 is performed by swinging the keyboard body 305.
7 utilizes that the rotation center axis 378 moves in a front-to-back relationship when viewed from the player. In other words, when the keyboard is depressed, the tip of the beak-shaped protruding piece 379 on the opposite side of the hammer 387 moves so as to be pulled out from the escapement member 381, thereby causing let-off.

Therefore, the more the player wants to ensure the let-off operation, the more he wants to move the rotation center axis 378 away from the keyboard body 305 and to set it at a higher position, and the movement distance of the rotation center axis 378 in the front-back relationship with respect to the player. I have to make it longer. In addition, the back check 389 also needs to be installed at a high position in response to this, so that it is difficult to design the action mechanism 373 to have a small vertical height. In addition, it is necessary to provide the back check 389 and adjust the degree of hitting, so that there is a problem that the number of parts and the number of assembly steps are large.

Further, in the conventional Wien-type action mechanism 373, the entire action mechanism 373 is provided at the striking point of the hammer portion 387 of the hammer body 377 (the hammer portion 387 has the string 3).
07), the length L (see FIG. 27) including the installation position of the hammer body 377 and the escapement member 381 is projected to the opposite side to the keyboard, so that the overall depth of the keyboard instrument can be designed to be small. It was difficult.
Further, if the hammer body 377 becomes larger, the rotation center shaft 378 of the hammer body 377 must be set at a higher position.
The deviation of the string striking point (the point where the hammer 387 contacts the string 307) becomes large.

[0023]

In order to solve these problems, the inventor has previously developed an action device for a keyboard instrument disclosed in Japanese Patent No. 3035826. The object of the patent is to make it possible to design the height and depth of the action mechanism portion to be small while suppressing the displacement of the striking point, and to have a flip-up action mechanism with a small number of parts and a small number of assembly steps, and a keyboard instrument having the action mechanism. Was to provide. Another object of the present invention is to provide a flip-up action mechanism that allows the user to play even when the main body is tilted, such as a standing performance, and a keyboard instrument having the action mechanism.

As shown in FIG. 31, an action mechanism 401 disclosed in Japanese Patent No. 3035826 has a keyboard body 405 having a keyboard portion 403 on the right side in the figure, and a string 407 serving as a sound source body.
And an escapement member 411 for controlling the hammering operation of the hammer body 409.

In FIG. 31, an intermediate portion in the longitudinal direction of a keyboard body 405 having a keyboard portion 403 at the right end in the figure is swingably held on the upper surface of a pedestal 415 by pins 413. As shown in FIG. 32, a hole 405a is formed on the opposite side of the pivot fulcrum of the keyboard body 405 (which is also a holding point at the position of the pin 413).

The hammer body 409 has a hammer section 417 at its tip for hitting a string 407 (see FIG. 31).
At the base of the hammer body 409, a hole 409a is opened,
On the opposite side to the hammer 417 with the hole 409a interposed therebetween, a beak-shaped projection 419 serving as a projection is projected. In addition, an extrusion protrusion 421 as an extrusion member is provided on the upper side of the drawing with respect to the beak-shaped projection 419.

Then, as shown in FIG.
5 and the hole 409a of the hammer body 409,
By inserting and fastening a set screw 423 having a female screw on the inside and a set screw 424 having a male screw on the outer periphery via a washer 426, the keyboard body 405 and the hammer body 409 are relatively rotatable. Fix by axle attachment. The inner diameter of the hole 409a of the hammer body 409 is slightly larger than the outer diameter of the female screw 423 on the female side (outside).
“a” is rotatable with respect to the female side set screw 423.
A keyboard lead (key red) 420 for adjusting the weight balance of the keyboard 405 is provided on a side surface of the keyboard 405. An appropriate number of the keyboard leads 420 are inserted through holes formed in the keyboard body 405, and are fixed by hitting from both sides in the compression direction to increase the diameter. Note that the set screw 423 serves as a fulcrum of rotation of the hammer body 409.

As shown in FIG. 33, the escapement member 411 is provided on the inside of the center of the back piece 429 with the engagement step 431.
And a suppressing member 433 protruding from the upper end of the back piece 429. Then, cushions 435 and 436 made of cloth or felt are attached to the lower surface of the suppressing member 433 and the upper side in the figure of the engaging step portion 431, respectively. Further, a sliding member 437 made of a series of leathers is adhered to the lower surface and the protruding surface of the engaging step portion 431 and the front surface of the cushion 436, whereby the engaging step portion 431 of the back piece 429 is A return sliding surface 439 that connects the upper side and the right vertex of the engaging step portion 431 in the drawing is formed.

A groove 441 is provided at the lower end of the escapement member 411, and the upper end of a spring plate 443 made of carbon fiber is inserted into and bonded to the groove 441. The lower end of the spring plate 443 is fixed to the stopper plate 44 by a screw 447.
5 to the machine base 449. Thus, the escapement member 411 is constantly urged toward the base of the hammer body 409 by the elastic force of the spring plate 443.

As shown in FIG. 31, the machine base 449 has a hammer section 417 and a base section (the set screw 42) of the hammer body 409.
3), the cushions 453 and 455 made of cloth are laid respectively.

Next, the operation of the action mechanism 401 will be described. In FIG. 31, when the player performs a key operation on the keyboard section 403, the pins 413 and the pedestal 41 are pressed.
The keyboard body 405 rotates clockwise in FIG.
The shaft attachment portion of the hammer body 409 (the pivot point of the hammer body 409 at the position of the set screw 423) rises in the striking direction, that is, toward the string 407. Due to this rise, the beak-shaped protrusion 419 of the hammer body 409 is engaged with the engagement step 431 of the escapement member 411.

When the player further depresses the keyboard portion 403, as shown in FIG. 34, the shaft attachment portion (the position of the set screw 423) of the hammer body 409 further rises toward the string 407, while the beak-shaped projection piece Since the ascending step 431 is prevented from rising by the engaging step 431, the hammer 417 of the hammer body 409 rotates, and the hammer 409 performs a striking and rotating operation toward the string 407. At this time, the pushing protrusion 421 of the hammer body 409 contacts the return sliding surface 439 of the escapement member 411 and gradually pushes the escapement member 411 against the elastic force of the spring plate 443 on its back side (FIG. 34 left side).

The hammer 417 of the hammer body 409
Hits the string 407, but immediately before the hit, the escapement member 411 is completely pushed out to the back side by the pushing protrusion 421 of the hammer body 409 against the elastic force of the spring plate 443. Beak-shaped projection 41 of body 409
9 is detached (let-off) from the lower surface of the engaging step portion 431. The hammer part 417 of the hammer body 409 when hitting is
As shown in FIG. 35, the beak-shaped protruding piece 419 is located above the lower surface of the engaging step portion 431 of the escapement member 411 in the figure. Therefore, when the escapement member 411 returns from the retracted position due to the elastic force of the spring plate 443, the beak-shaped protruding piece 419 detached from the engagement step 431 is located above the lower surface of the engagement step 431. It comes into contact with the sliding surface 439.

The beak-shaped projection 419 of the hammer body 409
Is released (let-off) from the lower surface of the engaging step portion 431, the hammer body 409 still rotates by inertia, and the hammer portion 417 hits the string 407. Meanwhile, the keyboard 403 is being pressed down by the player (see FIG. 35). The hammer part 417 after the hit has the string 4
The hammer 409 is rotated in the opposite direction (clockwise in the figure) by the repulsion force of 07 and is thrown downward in the figure.

Here, the restraining member 433 of the escapement member 411 abuts on the upper surface of the base end of the hammer body 409, whereby the hammer body 409 is moved to the hammer part 417.
Is stopped at a position away from the string 407 (FIG. 36).
reference). That is, the lower surface of the suppressing member 433 is in close contact with the upper surface of the base end portion of the hammer body 409 due to the pressing force of the keyboard portion 403 and the regulation of the suppressing member 433, and the rotation of the hammer body 409 in the clockwise direction in the drawing is prevented. At the same time, the rotation of the hammer body 409 in the counterclockwise direction in the drawing due to the reaction force of the collision between the lower surface of the suppressing member 433 and the hammer body 409 is also prevented. In this way, the rotation of the hammer 417 is suppressed by the suppressing member 433.
Therefore, the hammer body 409 does not strike the string 407 again due to rebound.

Finally, when the player releases the keyboard 403,
As the keyboard portion 403 floats, the opposite end of the keyboard body 405 descends, thereby causing the beak-shaped protrusion 419 to return to the return sliding surface 439.
, And returns below the engagement step 431.
On the other hand, at this time, the hammer body 409 is released from the suppression by the suppression member 433, falls to the cushion 455 by its own weight, and returns to the posture shown in FIG.

As described above, in the action mechanism 401 disclosed in Japanese Patent No. 3035826, the escapement member 411 is attached to the base end of the hammer body 409 on the opposite side to the hammer body 409 as the hammer body 409 strikes and rotates. The protrusion 421 serving as an extruding member for extruding the beak-shaped protrusion 419 of the hammer body 409 from the engagement step portion 431 is provided, whereby the beak-shaped protrusion 41 of the hammer body 409 is provided.
9 can be forcibly disengaged from the engagement step 431 of the escapement member 411. Therefore, FIG.
And the like, a member such as a support rod 375 for increasing a horizontal (keyboard portion) movement component in the arc-shaped movement locus of the beak-shaped protruding piece 379 as in the past shown in FIG. Since the length of 305 can be designed to be short, the height and depth of the action mechanism 401 (see FIG. 31) can be designed to be extremely small.

Further, the hammer body 409 is separated from the string 407 in a state where the beak-shaped protruding piece 419 is separated from the escape step part 431 while opposing the escapement member 411 in the striking direction so as to be able to approach and separate from the hammer body 409. Since the restraining member 433 for stopping by stopping is formed integrally, the back check 389 shown in FIG. 27 and the like becomes unnecessary, and the number of parts and the number of assembling steps can be reduced. In addition, since the bulky back check 389 becomes unnecessary, the action mechanism 401
The vertical height of the portion can be reduced.

Further, Japanese Patent No. 3035826 discloses another type of action mechanism 501. As shown in FIG. 37, the action mechanism 501 includes an escapement member 511 and a set screw 5 for pivotally attaching the hammer body 509.
Keyboard portion 503 for 23 (the other set screw is not shown)
It is arranged on the side.

The hammer body 509 of the action mechanism 501 has an arm portion 510 formed relatively short, and a beak-shaped projection 519 serving as a projection at its base end (right end in FIG. 37). Further, an operation block 512 which is an extrusion member which protrudes upward (toward the string 507) with respect to an extension of the arm portion 510 is formed. On the other hand, the escapement member 511 is provided with a concave portion, and an engaging step 531 is provided below the concave portion, and the suppressing member 5
33 respectively, and an escapement member 51
An adjusting screw 530 is screwed into the back piece 529 of the first.

The lower end of the escapement member 511 is swingably fixed to the mounting table 542 by a shaft 543, and a coil spring 541 is mounted on the keyboard 503 side (right side in FIG. 37). 511 is constantly urged toward the base end of the hammer body 509. On the other hand, a coil spring 5
06, the keyboard body 505 is constantly urged downward.

The hammer body 509 is rotatably mounted on the keyboard body 505 by a set screw 523 so that the sliding friction between the hammer body 509 and the keyboard body 505 is reduced. For the purpose of reduction, the washer 4 shown in FIG.
It is preferable to interpose a thrust bearing (not shown) instead of 26.

On the machine base 549, bars 544 and 545 are erected, and a soundboard 546 is attached to the upper ends of the bars 544 and 545, and a triangular prism-shaped piece 547 is provided substantially at the center of the soundboard 546. Fix it. These machines 549, pier 544,
The 545 and the sound board 546 constitute a sound box 548. A tuning pin 551 that fixes one end of the string 507 and adjusts its tension, and a trapezoidal piece 552 are fixed to a similar fixing portion disposed above the machine base 549.

According to this action mechanism 501, the extension (string 50) of the extension of the arm portion 510 of the hammer body 509.
(7 side), the operation block 512 serving as an extruding member is formed so as to protrude. Therefore, even when the keyboard portion 505 and the arm portion 510 of the hammer body 509 are formed short, the escapement member 511 is not reduced. It can be designed to have a sufficient size, can be operated reliably, and can have durability.

Further, since the mounting position of the set screw 523 can be designed low with respect to the operation block 512, the entire keyboard instrument can be designed to be flatter. Further, in the action mechanism 501, the escapement member 51
A coil spring 541 is attached to the lower end of the hammer body 509, and the escapement member 511 is always urged toward the base end of the hammer body 509. There is no risk of accidentally hitting 507. Further, since a thrust bearing is interposed between the hammer body 509 and the keyboard body 505, friction between them is small. Further, since the keyboard 505 is constantly urged downward by the coil spring 506, the keyboard 503 does not float. Therefore, it is possible to stand or sit on such a keyboard instrument in a playing posture as when playing an accordion.

The inventor then sets this action mechanism 501 to a metal plate 603 as a sound source as shown in FIG.
An action mechanism 601 has been created which can be applied to a. The action mechanism 601 includes the action mechanism 50
The structure is basically the same as 1
The same reference numerals are given and the description is omitted, and only different main parts are shown and described.

The escapement member 511 is exactly the same as the action mechanism 501 except that the hammer body 602 that engages with the escapement member 511 is different from the hammer body 509 of the action mechanism 501 and the sound source body is the string 507. The difference is that a metal plate 603 is arranged vertically instead.

In the action mechanism 601, the keyboard body 505
At the other end opposite to the keyboard portion 503, a cushion material 605 made of felt with which the lower end of the hammer portion 604 of the hammer body 602 abuts is arranged. As a result, the hammer body 602 released from the hammer stop does not directly fall to the position of the stationary state, so that the performance of the repetition (continuous hitting function) is somewhat increased. At the tip of the hammer 604, a sounding portion 606 that comes into contact with the metal plate 603 is provided so as to be orthogonal to the metal plate 603 at the time of sounding. As shown in FIG. 38, the tip of the striking portion 606 has a circular curved surface 607, and a striking portion having another shape can be appropriately bonded to the hammer portion 604. Metal plate 6
Reference numeral 03 denotes a hanging support member 609, 609, which is inserted into openings 608, 608 on the upper and lower ends, and is held.

Further, the mounting position of the tapping portion 606 is shown in FIG.
, And can be adhered so as to be in an appropriate position. In FIG. 40, the metal plate 603
Are suspended vertically, but even when installed diagonally, the sounding portion 606 can be adhered diagonally in accordance with it.

Below the keyboard portion 503, a pedestal 610 fixed to the base 549, a keyboard position regulating rod 611 having an oval cross section fixed to the pedestal 610, and a disk-shaped plate mounted on the pedestal 610. Cushion part 61 made of felt material etc.
2 are provided. The keyboard position regulating rod 611 enters a slot-shaped groove 613 provided in the keyboard body 505 to regulate the lateral position of the keyboard body 505. The upper part of the groove 613 is closed by the keyboard 503.

On the pedestal 415, a support 614 having a semicircular cross section is arranged so as to cross the keyboard 505 in order to facilitate the swinging of the keyboard 505. It is preferable that a cushion material made of felt or the like be placed on the support portion 614. The pin 413 having a circular cross section is
5, the fan-shaped hole 615 whose length in the longitudinal direction becomes longer as it goes upward, so that the keyboard body 505 can swing around the contact portion with the support portion 614 as a fulcrum. Is configured.

One end of the coil spring 506 enters a hollow portion 617 provided in a fixing portion 616 fixed to the machine base 549, and the other end is in contact with the keyboard 505. The urging force is adjusted by the adjusting screw 618. When the back piece 529 of the escapement member 511 abuts on the fixing portion 616,
A cushion member 619 made of felt or the like that performs a cushion function is adhered and fixed.

The action mechanisms 401 and 501 shown in Japanese Patent No. 3035826 and the action mechanism 601 newly developed by the present inventor have various advantages as described above and are sufficiently practical. However, the repetition (repeated tapping function) is still inadequate and still quite inferior to the action of a grand piano.

The present invention has the advantages of the action mechanism disclosed in Japanese Patent No. 3035826. That is, the height and depth of the action mechanism portion can be designed to be small while the displacement of the hitting position is suppressed, and the number of parts and the number of assembly steps are reduced. It is an object of the present invention to provide an action mechanism capable of improving a repetition (continuous tapping function) while maintaining the advantage of being able to do so, and a keyboard instrument having the action mechanism.

[0055]

In order to achieve the above-mentioned object, an action mechanism of the present invention provides a keyboard body having a keyboard portion at one end and a middle portion in the longitudinal direction of the keyboard body or the other end thereof can be freely moved. , And the base of the hammer body is rotatably mounted on the opposite side or the same side of the keyboard portion with respect to the holding point of the keyboard body, and a beak-shaped projection is attached to the base end of the hammer body. The escapement member which is constantly urged toward the beak-shaped projection of the hammer body has an engaging step portion formed thereon, and the shaft attachment portion of the hammer body is attached to the keyboard by a key operation of the keyboard portion. An action mechanism configured to rotate following the movement of the body, wherein the beak-shaped projection of the hammer engages with the engagement step of the escapement member, and the hammer rotates. And at least one of the escapement members With the operation, a pushing member that pushes the escapement member to the opposite side with respect to the hammer body and disengages the beak-shaped protruding piece of the hammer from the engaging step portion is provided, and a rotating member capable of engaging and disengaging with the hammer body Is provided rotatably with respect to the escapement member, and a biasing means for biasing the rotating member in a predetermined direction is provided. The hammer body which has returned after the rotating operation is locked by the rotating member. The joint portion can be re-engaged with the beak-shaped projection as soon as possible.

For this reason, in the present invention, it is possible to design the height and depth of the action mechanism portion to be small while suppressing the displacement of the hitting position, and to maintain the advantage that the number of parts and the number of assembling steps can be reduced. Function) can be improved.

That is, since the base of the hammer body is directly rotatably provided on the keyboard body, the displacement of the hitting position can be suppressed, and the vertical height of the action mechanism can be reduced. In addition, with at least one of the hammer body and the escapement member, the escapement member is pushed out to the opposite side to the hammer body, and the beak-shaped protruding piece of the hammer body is engaged with the hammer body in accordance with the impact rotation operation of the hammer body. Since the extruding member is detached from the escapement member, the beak-shaped projection of the hammer body can be forcibly detached from the engaging step of the escapement member. Therefore, unlike the related art, a member such as a support rod 375 for increasing the horizontal (keyboard portion) movement component of the beak-shaped projection 379 (see FIG. 27) is not required, and the length of the keyboard body is also reduced. Since the action mechanism can be designed, the height and depth of the action mechanism can be designed to be extremely small. Further, since a rotating member is provided to accelerate the re-engagement of the beak-shaped projecting piece of the hammer and the engaging step of the escapement member, repetition (continuous hitting function) is improved and continuous hitting is possible.

Another aspect of the present invention provides, in addition to the action mechanism of the above-described invention, a hammer body that is opposed to a hammer body so that the beak-shaped protruding piece is detached from the engaging step portion. The escapement member is provided with a restraining member that stops at a distance from the highest moving position.

As described above, the restraining member that separates the hammer body from the sound source body or the highest rotation position and stops when the beak-shaped protruding piece is disengaged from the engagement step portion while opposing the hammer body so as to be able to freely contact and separate therefrom is provided. Since it is formed on the escapement member, the back check 389 (see FIG. 27) in the conventional example becomes unnecessary, and the number of parts and the number of assembling steps can be reduced. In addition, the vertical height of the action mechanism can be reduced.

An action mechanism according to another aspect of the present invention has a keyboard at one end and a swingable keyboard body which is held at an intermediate portion in the longitudinal direction or at the other end, and which holds the keyboard body. A hammer body having its base portion rotatably fixed to the side opposite to or in the same direction as the keyboard portion across the point, and a hammer body having a hammer section, and an escapement member constantly biased toward the hammer body. A protrusion is provided on the opposite side of the hammer portion with respect to the rotation fulcrum of the hammer body, and the escapement member is provided with an engagement step portion that engages with the protrusion, and the key operation of the keyboard portion is performed. An action mechanism configured such that when the rotation fulcrum of the hammer body rotates in the striking direction, the projecting piece of the hammer body engages with the engaging step of the escapement member, and the hammer body rotates. In the above, the rotating member that can be And a biasing means for rotatably mounting the rotating member in a predetermined direction, locking the hammer body that has returned after the rotating operation by the rotating member, and The part can be re-engaged with the protruding piece early.

With this configuration, the vertical height and depth of the action mechanism can be designed to be small while suppressing the displacement of the hitting position, and the repetition can be achieved while maintaining the advantages that the number of parts and the number of assembly steps can be reduced. (Continuous hitting function) can be improved. That is, since the base of the hammer body is directly rotatably provided on the keyboard body, the displacement of the hitting position can be suppressed, and the vertical height of the action mechanism can be reduced. Also,
Since the escapement member is provided with a rotating member that accelerates re-engagement of the projecting piece of the hammer and the engagement step portion of the escapement member, repetition (continuous hitting function) is improved and continuous hitting is possible.

According to another aspect of the present invention, in addition to the action mechanism of the above-described invention, at least one of the hammer body and the escapement member has the escapement member opposed to the hammer body in accordance with the rotation of the hammer body. An extruding member is provided for extruding the protrusion of the hammer body from the engaging step so as to be pushed out to the side.

As described above, at least one of the end of the hammer body and the escapement member, the escapement member is pushed out to the opposite side with respect to the hammer body in accordance with the impact rotation operation of the hammer body. Since the extruding member for detaching the projecting piece of the body from the engaging step is provided, the projecting piece of the hammer can be forcibly detached from the engaging step of the escapement member. Therefore, unlike the related art, a member such as the support rod 375 for increasing the horizontal movement component (keyboard direction) of the beak-shaped projection 379 can be eliminated or reduced, and the length of the keyboard body can be designed to be short. The height and depth of the action mechanism can be designed to be extremely small.

In another invention, in addition to the action mechanism of each of the above-described inventions, when the hammer body starts rotating,
The pivoting member rotates together with the escapement member against the urging force of the urging means to extend, and immediately before the hammer strikes the sound source body or immediately before the pivoting maximum position, the pivoting member is a keyboard body. Following the above movement, the rotation of the escapement member is further stopped even after the rotation of the escapement member is stopped, and the urging means is further compressed.

With this configuration, at the beginning of rotation of the hammer body, the rotating member rotates integrally with the escapement member, and immediately before hitting the sound source body or the like, only the rotating member is rotated. It can be further rotated. For this reason, the escapement member does not rotate to the return side immediately after the impact or the like,
The rotation of the hammer body can be prevented by the rotating member, and the re-engagement between the engaging step of the escapement and the projecting piece of the hammer body can be performed reliably and quickly.

Further, according to another aspect of the present invention, in addition to the action mechanism of each of the above-mentioned inventions, the turning member is provided with a cylindrical blocking portion for preventing the hammer from returning. An engaging / disengaging portion is provided which engages with the blocking portion and prevents the return operation. As described above, since the rotating member is provided with the cylindrical blocking portion, the engaging and disengaging portion of the hammer body can be smoothly engaged with and disengaged from the blocking portion.

In addition, in another invention, in addition to the action mechanism of each of the above-mentioned inventions, a part of the rotating member is interposed between the biasing means and the escapement member to rotate the biasing force of the biasing means. The escapement member is transmitted to the escapement member via the moving member, and the escapement member is constantly biased toward the hammer body. With such a configuration, the biasing means is
And the number of parts does not increase. Further, the arrangement of the rotating member and the escapement member can be made compact.

The keyboard instrument of the present invention has the action mechanism of any one of the above-mentioned inventions. For this reason, it is possible to provide a keyboard instrument in which the vertical height and depth of the action mechanism portion are reduced while suppressing the displacement of the hitting position, and while maintaining the advantage that the number of parts and the number of assembly steps can be reduced, the repetition (continuous hitting function) ) Can be improved. That is, since the base of the hammer body is directly rotatably provided on the keyboard body, the displacement of the hitting position can be suppressed, and the vertical height of the action mechanism can be reduced.
In addition, since the escapement member is provided with a rotating member that hasten the re-engagement of the projecting piece of the hammer and the engagement step of the escapement member, a keyboard instrument with improved repetition (continuous tapping function) can be provided. .

[0069]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, the first
The embodiment will be described with reference to FIGS. In the following, only the action mechanism portion of the keyboard instrument will be described, and the description of the overall structure of the keyboard instrument will be omitted.

The action mechanism 1 has basically the same configuration as the action mechanisms 501 and 601 described above. The main difference is a portion added to improve repetition (continuous hitting function).

As shown in FIG. 1, the action mechanism 1 has a keyboard 2 at one end and a swingable keyboard 3 having an intermediate portion in the longitudinal direction and a swingable keyboard. A hammer for striking a string 5 serving as a sound source body, with its base portion rotatably fixed to a side opposite to the keyboard portion 2 with a pin 4 serving as a holding point of the swinging center point interposed therebetween. A hammer body 7 having a portion 6, an escapement member 9 constantly biased by a coil spring 8 acting as a biasing means toward the hammer body 7, and a rotating member 10 for improving repetition (continuous hitting function). Have.

The keyboard 3 is set on the machine base 11. The machine base 11 includes a pedestal 12, a keyboard position regulating rod 13 fixed to the pedestal 12 and having an oval cross section, and a cushion portion 1 made of a disc-shaped felt and the like placed on the pedestal 12.
4 are provided. The keyboard position regulating rod 13 enters a slot-like groove 15 provided in the keyboard body 3 to regulate the lateral position of the keyboard body 3. The groove 1
Reference numeral 5 denotes an upper portion and a front surface (on the side of the player) of which the keyboard portion 2 is closed.

The pedestal 11 is further provided with a pedestal 16. On the pedestal 16, a support portion 17 having a semicircular cross section crosses the keyboard 3 in order to facilitate swinging of the keyboard 3. Are located. A cushion 18 made of felt or the like is placed on the support 17. Support part 1
The pin 4 inserted into and fixed to 7 has a columnar shape having a circular cross section, and is inserted into a fan-shaped hole 19 which is a hole provided in the keyboard body 3 and whose length in the longitudinal direction becomes longer toward the top. I have. As a result, the keyboard body 3 is
Can be swung about the contact portion with the fulcrum.

Above the machine base 11, a mounting base 22 for rotatably supporting one end of the escapement member 9 and screwing a spring holding member 21 for holding one end of the coil spring 8, and a keyboard body 3. Is fixed to a pedestal 24 on which a cushion material 23 made of felt with which the rear end abuts is placed. The pedestals 12, 16, 24
Is attached to the machine base 11, and the mounting base 22 is
To the machine base 11. The adjustment of the coil spring 8 is performed by the degree of screwing of the spring holding member 21.

In addition to the hammer part 6, the hammer body 7
As shown in the figure, a beak-shaped projection 31, an extrusion projection 32 serving as an extrusion member, and a lever-shaped engagement / disengagement portion 3 which engages / disengages with the rotating member 10.
3, a spring engaging portion 35 (see FIG. 2) for engaging one end of a hammer spring 34 for assisting the return operation of the hammer body 7, and the pushing protrusion 3 provided at the tip of the pushing protrusion 32.
A sliding portion 37 made of leather or the like which is a part of the engaging and disengaging portion 33 provided at a portion of the engaging and disengaging portion 33 which comes into contact with the rotating member 10; A hole 39 into which the screws 38 are inserted is provided.
The set screws 38, 38 are provided in holes 3 provided in the keyboard body 3.
c, so that the hammer 7 can be turned with respect to the keyboard 3. The place where the set screw 38 is attached is referred to as the base of the hammer 7.

The hammer 7 is rotatably attached to the keyboard 3 by means of screws 38, 38 and washers 40.
At this time, the other end of the hammer spring 34 is hooked on the string 3 a attached to the keyboard 3. The keyboard 3 also includes a base 3b on which a part of the rotating member 10 is placed,
A hole 3c through which the set screw 38 passes is provided.

The escapement member 9 is a part of an engaging step 41 that engages with the projection 31 of the hammer body 7 and a part of a restraining member made of felt or the like that comes into contact with the back surface of the extrusion protrusion 32 of the hammer body 7. The suppressing portion 42, an adjusting screw 43 for adjusting a let-off for adjusting a position where the cushion portion 36 of the pushing protrusion 32 abuts, and an urging force receiving portion 44 which receives the urging force of the coil spring 8 via the rotating member 10. And a hole (not shown) for inserting the mounting shaft 45.

The escapement member 9 further includes
As shown in FIG. 8, a turning member angle adjusting screw 46 for adjusting the turning position relationship with the turning member 10, a suppressing member 47 to which the suppressing portion 42 is fixed, and an escapement body 48 And a sliding member 51 made of leather or the like adhered to the engaging step portion 41 and serving as a part of the engaging step portion 41. In addition, the escapement main body 48 is provided with a concave portion 52 into which the engaging / disengaging portion 33 of the hammer body 7 enters, and a screw hole 53 with which the turning member angle adjusting screw 46 is engaged.

The escapement member 9 has a rotating member 10 for improving repetition (continuous hitting function).
Is provided so as to be rotatable about a shaft 61 passing through the escapement member 9 and the rotating member 10.

As shown in FIGS. 4 and 5, the rotating member 10 is provided with an urging force receiving portion 44 of the escapement member 9.
A cylindrical roller 63 serving as a blocking portion for engaging and disengaging the engaging / disengaging portion 33 of the hammer body 7 and for preventing the hammer body 7 from returning. A roller support rod 64 mounted on the base 3b of the keyboard body 3 from a predetermined time due to the rotation of the hammer body 7, a cushion portion 65 made of leather or the like against which the tip of the rotation member angle adjusting screw 46 abuts; The pedestal 66 includes a pedestal 66 receiving the urging force of the spring 8 and a spring receiver 67 in which a head 67a is arranged in the internal space of the pedestal 66 having a triangular cross section.

The roller support rod 64 has a small-diameter portion 71 part of which is made thinner.
3 is inserted through a center hole 72 provided at the center of the third. With this configuration, the roller 63 can rotate around the small diameter portion 71. In addition, holes 73, 73 for inserting the shaft 61 are provided at substantially the centers of the side portions 62, 62.

The operation of the action mechanism 1 according to the first embodiment configured as described above will be described with reference to FIGS. Each drawing is a partially enlarged view showing the relationship between the hammer body 7, the escapement member 9, and the rotating member 10, and a partially enlarged view around the beak-shaped protruding piece 31 of the hammer body 7.

First, FIGS. 6 and 7 show a stationary state before the keyboard portion 2 is depressed. In the state of the stationary view, the rotating member 10 provided with the roller 63 by the action of the rotating member angle adjusting screw 46 maintains a constant angle with the escapement member 9. Therefore, the engaging / disengaging portion 33 extending from the base of the hammer body 7 is separated from the roller 63 (FIG. 7).
reference).

When the keyboard portion 2 is depressed, as shown in FIG. 8, the entire rear portion of the keyboard body 3 starts to rise, and the hammer body 7 starts rotating with respect to the keyboard body 3. Approaching. This is because the projecting piece 31 is suppressed by the engaging step 41 when the set screw 38 starts to rise,
This is because the hammer 6 rotates around the set screw 38.

When the keyboard portion 2 is depressed, the lever-shaped engaging / disengaging portion 33 extending from the base of the hammer 7 and the roller 63 gradually approach as shown in FIG. Rotating member 1
The zero roller support bar 64 approaches the base 3b installed on the keyboard 3. Further, the coil spring 8 is compressed as the escapement member 9 is inclined by being pushed by the adjusting screw 43 for let-off adjustment. FIG.
9 shows a state in which the keyboard portion 2 of the keyboard position regulating rod 13 has been pressed down by 2 mm. The length that can be pushed down is 8 mm in this embodiment.

Further, when the keyboard 2 is pushed down (depth of 3.8 mm), the beak-shaped projecting piece 31 reaches the curved surface of the engaging step 41 as shown in FIGS. 10 and 11. At this time, the hammer 6 is further rotated, and is closer to the string 5. At this point, as shown in FIG. 11, the sliding portion 37 on the upper surface of the engaging / disengaging portion 33 and the roller 63 come into contact with each other, and the roller support rod 64 and the base 3b of the keyboard 3 come into contact with each other. That is, so that these two contacts occur simultaneously,
The angle between the rotating member 10 and the escapement member 9 is adjusted in advance by the rotating member angle adjusting screw 46.

When the keyboard 2 is further depressed, the hammer 7 is further raised, and the hammer 6 is turned and approaches the string 5. At this time, as shown in FIG.
4 rides on the base 3b installed on the keyboard 3, and thereafter, as long as the roller support bar 64 rides on the base 3b, the roller support rod 64 moves upward as the rear of the keyboard 3 rises. Then, the engagement / disengagement portion 33 and the roller 63 start to separate again.

At this time, when the roller support rod 64 is pushed up from the base 3b, the rotating member 10
In 2 start rotating clockwise. Thereby, the coil spring 8 is compressed by the rotation of the rotating member 10 in addition to the change in the angle of the escapement member 9. Thus, the coil spring 8 is compressed in two stages. The change in the angle of the escapement member 9 is about 10 ° until the keyboard 2 is pushed down to about half the depth and the tip of the beak-shaped projection 31 reaches the curved surface of the engaging step 41.
However, after the tip of the protruding piece 31 reaches the curved surface of the engaging step portion 41, the change becomes smaller, and it takes about 3 to 3 hours before the keyboard portion 2 is pressed down to the maximum depth. ° only changes.

On the other hand, the compression of the coil spring 8 due to the rotation of the rotating member 10 starts when the tip of the beak-shaped protruding piece 31 approaches the curved surface of the engaging step 41 and continues until the string is struck. The angle change at this time is about 7 °. When the rotating member 10 starts rotating, the rotating member angle adjusting screw 4
A gap is formed between the cushion member 6 and the cushion portion 65 which is a contact surface of the rotating member 10. Note that the depression depth of the keyboard portion 2 in FIGS. 12 and 13 is 5 mm.

As shown in FIGS. 14 and 15, when the strings are struck, the rear of the keyboard 3 rises to the highest position, and the hammer 6 also reaches the highest turning position. Further, the position of the roller 63 also has the maximum height. The height of the base 3b installed on the keyboard 3 is adjusted so that this height is the same as the height at which the top surface of the tip of the protruding piece 31 rises at the time of the next hammer stop. Therefore, FIG. 16 and FIG.
When the hammer stops as shown in (1), even if the top surface of the tip of the protruding piece 31 rises, it does not become an obstacle, so that the hammer body 7 after striking can be rotated to the hammer stop position without any trouble.

At the time of string striking, as shown in FIG. 14, the coil spring 8 is strongly pressed by the rotating member 10 and compressed. In FIG. 14, the tip of the hammer 6 faces the string 5 face-to-face when the string is struck,
Although the entire tip is illustrated as contacting the string 5,
Actually, the string 5 is stretched at an angle with respect to the longitudinal direction of the keyboard body 3, so that the string 5 comes into contact with one point at the tip.

After striking the string, the keyboard 2 continues to be located at the lowest position, but the hammer 7 returns to its original position due to the repulsive force of the string 5 and the structure described below. That is, as shown in FIG. 15, since the gap L exists between the roller 63 and the engagement / disengagement portion 33, the hammer body 7 is not obstructed by the roller 63 from rotating as shown in FIG. It returns to the hammer stop position by the weight of the hammer 6 and the repulsive force of the string 5. At the position of the hammer stop, the back surface of the extrusion protrusion 32 abuts on the suppressing portion 42, and the return operation is prevented.
Also, as shown in FIG.
(Actually, the sliding portion 37 which is a part of the engagement / disengagement portion 33), and the hammer body 7 is also prevented from returning to its original position at this portion. Even during this contact, the roller support bar 64 and the base 3b remain in contact.

The hammer spring 34 attached to the hammer body 7 allows the hammer body 7 to return (from the string striking to the hammer stop, rotating the hammer body 7 in a direction opposite to the direction in which the hammer body rotates at the time of string striking). "Return of the hammer".) This hammer spring 3
The string 4 is pulled by the string 3a attached to the keyboard 3, and is deformed at the time of string striking so as to maximize its effect (elasticity).

When the hammer spring 34 is struck extremely weakly, the return of the hammer 7 becomes poor due to friction between the lower surface of the tip of the beak-shaped protruding piece 31 and the curved surface of the engaging step 41, or the keyboard body In order to prevent the return of the hammer 7 from being deteriorated when the device 3 is used in a state other than the state in which the surface of the device 3 faces upward, it is attached.

After the stop of the hammer, the pressing force of the keyboard portion 2 is released and the keyboard portion 2 is raised, and the rear portion of the keyboard 3 descends, and the hammer portion 6 moves away from the string 5 (see FIG. 18). ). At the same time, the back surface of the extrusion protrusion 32 moves away from the suppressing portion 42. Since the position of the base 3b supporting the roller support bar 64 is lowered, the rotating member 10 rotates accordingly, and the roller 63 lowers its position.
At this time, the roller 63 has a function of pressing down the lever-shaped engaging / disengaging portion 33 extending from the hammer body 7 by the force of the coil spring 8 compressed by the rotation of the rotating member 10.

Since the engaging and disengaging portion 33 of the hammer 7 cannot push up the roller 63 against the downward pressing force, the engaging and disengaging portion 33 and the roller 63, the roller support rod 64, and the base 3b of the keyboard 3 can be used. Are lowered simultaneously with the lowering of the rear part of the keyboard body 3 in the state of contact at the same time. This continuation of the contact state is continued from the state in which the keyboard portion 2 is depressed at a depth of 6.5 mm in FIGS. 18 and 19, and the state in which the depression depth is 5 mm in FIGS. 20 and 21.

In the process shown in FIGS. 10 and 11, that is, in the process of pushing down the keyboard portion 2 for striking the strings, the engagement / disengagement portion 33 and the roller 63, the roller support rod 64 and the base portion 3 b of the keyboard body 3 are moved. When the hammer 7 descends along with the lowering of the keyboard body 3 to the position where it contacts simultaneously, the tip of the protruding piece 31 is
11 is pushed down along the curved surface of the engaging step 41 until the tip of the projecting piece 31 reaches the curved surface of the engaging step 41. For this reason, the keyboard portion 2 can be depressed again to hit a string before the front portion of the keyboard body 3 reaches the highest position, that is, before the stationary state.

As a result, a repetition of quicker continuous hits can be performed. In the above-described embodiment, the depressable amount of the keyboard portion 2 is set to 8 mm, and the remaining key depth is 3.8 mm, that is, 4.2 m from the completion of the depression.
The key operation can be performed again after returning to m. However, the actual model produced from each figure gave better results. As an example of specific numerical values, the adjusted amount of the keyboard part 2 is 8 mm as a result of adjusting the manufactured model.
In this case, the key operation can be performed again at the point of returning 3.8 mm from the completion of the pressing. With further improvements, it may be possible to perform the keying operation again at an earlier point in time. If re-keying is possible with less than half of the depression amount, re-keying operation becomes possible before the damper for suppressing the vibration of the string 5 when the keyboard body 3 used in the piano starts to work, and it is extremely practical. It will be preferable.

Next, the layout relationship of the keyboard 3 when the action mechanism 1 performing such an operation is incorporated into an actual keyboard instrument will be described with reference to FIG.

FIG. 22 is a plan view showing the state where the hammer 7 and the escapement member 9 arranged on the keyboard 3 are removed (the string 3a and the base 3b are also omitted). FIG. 22 exemplarily shows three CDE sounds and a semitone part therebetween. As shown in FIG. 22, the presence of the semitone part causes the pin 4 to be a pivot point of the keyboard body 3.
Are arranged in two rows in a staggered arrangement, and the keyboard position regulating rods 13 of the keyboard portion 2 are also arranged in a staggered arrangement.
It is arranged in columns. The shapes of the keyboards 3 are all different except that the two semitone parts are identical to each other. However, the basic configuration of each keyboard body 3 is exactly the same as the configuration shown in FIGS.

Next, a keyboard instrument according to a second embodiment of the present invention will be described with reference to FIG. Also in the second embodiment, only the action mechanism will be described.
A description of the entire instrument will be omitted. The same members as those of the action mechanism 1 described above are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The action mechanism 201 employed in the keyboard instrument of the second embodiment differs from the action mechanism 1 in that the strings 5 are arranged below the keyboard 3 and the hammer 7 and the escapement member 9 The rotation member 10 is disposed on the keyboard 2 side with respect to the pin 4 serving as a swing fulcrum. FIG. 23 also shows a keyboard body 211 serving as a black key in addition to the keyboard body 3 serving as a white key. The keyboard body 211 also
It swings with the pin 4 at another position as a fulcrum. Note that the escapement member 9 and the rotating member 10 in the case of a black key are
3 is disposed at a position closer to the pin 4 side.

[0103] Between the keyboard bodies 3, 211 and the pedestal 16,
A regulating part 213 fixed to the base 16;
The cushion material 214 placed on the keyboard body 3, 21
1 and a coil spring 215 for keeping the stationary state. The restricting portion 213 has a concave cross section,
Each of the keyboard bodies 3 and 211 is inserted one by one into each of the concave portions, and the position is regulated.

The machine base 202 includes an upper machine base 202a for mounting the mounting base 22, the pedestal 203, and the rail-shaped member 204.
And a left machine base 202b to which the pedestal 16 to which the pin 4 is attached is fixed, and a right machine base 202c to which the pedestal 12 is attached. On the pedestal 203, an adjusting screw 205 for adjusting and aligning the height of the tip of the keyboard body 3, 211 is arranged, and the adjusting screw 205 and each of the keyboard bodies 3, 211 are arranged.
Cushion 20 made of felt or the like between 211 and
6 are provided. In addition, the rail-shaped member 204 holds the other end of the pin 4 serving as a swing fulcrum via a cushion member 207, and prevents the keyboard bodies 3 and 211 from lifting.

In the keyboard musical instrument according to the second embodiment, the regulating portions 213 are provided below the pins 4 serving as fulcrums of the keyboard bodies 3 and 211 so as to sandwich the keyboard bodies 3 and 211 from both sides.
There is no guide pin at the front end of the keyboard 3,211. The positions of the pins 4 serving as fulcrums of the keyboard bodies 3 and 211 are the same as those of the white key body 3 and the black key body 211 as viewed from the side. As described above, the positions of the hammer 7, the escapement member 9, the rotating member 10, and the like are shifted in the length direction by the white key and the black key, but in FIG. Omitted.

By depressing the keyboard 2, the hammer 7
Will strike the string 5. The operations of the hammer 7, the coil spring 8, the escapement member 9, and the rotating member 10 at this time are the same as those of the action mechanism 1 of the first embodiment.

The second embodiment is different from the first embodiment in that the first embodiment is mainly built in the instrument main body, whereas the second embodiment is a sound source such as a string 5 or the like. Of course, it is possible to produce as a musical instrument having a sound source, but it can be produced as a device having no sound source body. For example, a sound source body such as a string or a metal plate, such as a guitar or a metal harp, is exposed. , Which can be used as a keyboard instrument.

In the second embodiment, the escapement member 9 and the hammer 7 are arranged 180 degrees symmetrically with respect to a virtual center line drawn up and down the center.
The hammer 7 may be configured to collide with the hammer 7 from one side of the vertically arranged metal plate 603 as shown in FIG. Further, the second embodiment may be configured so that a mechanism for improving repetition is not added.

The above embodiments are examples of preferred embodiments of the present invention. However, the present invention is not limited to these embodiments, and various modifications may be made without departing from the gist of the present invention. Changes can be made. For example, as shown in FIG. 24, the keyboard body 3 may be provided with a set screw 38 so as to protrude to the side where all the length directions are one plane. Note that the keyboard body 3 has a width W1 of about 10 mm. This width W1 is the same as the width of the keyboard portion 2 of the semitone portion, and is the basis of the keyboard body 3 in the width direction.

The structure of the keyboard 3 may be as shown in FIG. The keyboard body 253 shown in FIG. 25 is preferably applied to a keyboard instrument using a general-sized keyboard. In this keyboard body 253, a portion corresponding to the set screw 38 becomes a bridging-shaped rotation center portion 254, and the rotation center portion 254 traverses two tip portions 255 and 255 that form a bifurcated structure together. It is hanging. This keyboard 2
In 53, the hammer body 7 and the escapement member 9 are disposed between the two front ends 255 and 255, and the hammer body 7
Is rotatably attached to the rotation center 254.

The hammer body 7 is preferably made of wood, but may be made of another material such as synthetic resin. Also,
The tip of the hammer 6 of the hammer 7 may be made of the same material as that of the first embodiment, but if it is desired to adjust the sound quality, the tip made of leather or felt is bonded. It may be fixed. Further, a coated front end portion that covers both side surfaces of the front end may be used. Further, rubber may be attached to the tip of the hammer portion 6 of the hammer body 7.

Such a method of devising the shape of the tip of the hammer 6 or attaching a member such as leather, felt, rubber, or the like to the tip of the hammer 6 can be achieved by engaging the step 4 with which the beak-shaped protruding piece 31 contacts.
The same can be applied to the portion 1. As shown in FIG. 26, the shape of the hammer body 7 is as follows.
The hammer 6 may be lengthened to provide a space S between the hammer 6 and the extrusion protrusion 32, and another component such as a fixing portion as a suppressing member described later may be disposed in the space S.

Further, in each of the above-described embodiments, a portable keyboard instrument is intended. However, a large keyboard instrument such as an electronic organ, an upright piano, a grand piano and the like which is arranged in a house may be used. .

In the keyboard instruments according to the above-described embodiments, when a sound-stopping device (damper) of a sound source is added to each of the action mechanisms 1, 201, the method used for the conventional keyboard instruments is used as it is. Can be adopted. Further, the suppressing member 47 may be attached to a fixing member fixed to the machine base 11. Further, although the restraint member 47 attached to the escapement member 9 and the restraint member 47 fixed to the machine base 11 are removed, the operation is performed, but the hammer 7
Is rebounded, and the operation is not stable, and it is difficult to repeatedly hit. However, it can be used as a toy or a musical instrument for infants even if the suppression member 47 is removed.

Further, in each of the embodiments and the modifications,
The arrangement surface of the keyboard portion 2 and the arrangement surface of the strings 5 were parallel to each other, and the entire keyboard instrument was configured in a flat shape. However, the hammer body 7 of the present invention was bent upward at substantially right angles from the arm portion corresponding to the handle. By making the shape, that is, FIGS. 26 and 38
In this configuration, the strings 5 and the like can be arranged in a direction orthogonal to the keyboard portion 2 (the surface facing the player) to provide an upright piano-type keyboard instrument. A shaft 423 is provided at the rear of the keyboard body 405 as shown in FIG.
Is provided, and the escapement member 411 is provided at the rear end.

In each of the embodiments, the string 5 is used as the sound source. However, the sound source according to the present invention may be replaced with a metal plate 603, glass, a bell, or the like. good. Further, as the shape and structure of the hammer body 7, various conventionally known ones can be adopted. Further, although the extrusion protrusion 32 serving as the extrusion member is provided on the hammer body 7, the adjustment screw 43 provided on the escapement member 9 is provided.
Is also a kind of extrusion protrusion, and the extrusion member may be provided on at least one of the hammer body 7 and the escapement member 9. In addition, the push-out member may not be provided by slightly sacrificing the let-off performance or by improving the positional accuracy of the protruding piece 31 and the engaging step 41.

The action mechanisms 1 and 20 of the present invention
In No. 1, since the hammer body 7 can be released (let-off) with the same playing feeling as a general piano, a cushion can be used in place of a sounding body as a sound source body to create a soundless keyboard for practice. The present invention can be applied to an electronic musical instrument by applying the present invention or using a sensor of the electronic musical instrument instead of the sounding body, and such a configuration also belongs to the category of the present invention.

When the present invention is applied to an electronic musical instrument, a string sensor is provided at the string striking portion, or the operating speed is detected by a speed sensor arranged near the keyboard portion 2 to detect the string striking. It is preferable to detect the speed and change the playing intensity. By doing so, it becomes a kind of real touch keyboard, and while being an electronic musical instrument, a mechanic feeling can be obtained.

Further, other biasing means such as a rubber member instead of the coil spring 8 or a metal disc spring may be employed. Further, in each embodiment,
Although the engaging step portion 41 has a projecting shape, it has a concave shape,
The upper inner surface of the recess may have the same function as the lower surface of the engaging step portion 41. Also, two coil springs 8 as urging means are provided instead of one,
A dedicated coil spring may be assigned for rotation of only 0.

Further, most of the improvements of the present invention are not limited to the configuration in which the hammer 7 is directly attached to the keyboard 3, but the configuration in which the hammer 377 is attached to the support rod 375 as in the prior art. It can be applied to things. The action mechanisms 1, 201 can be applied not only to musical instruments such as keyboard instruments, but also to various other devices such as continuous on / off of an electromagnetic relay and an action portion of a game device.

[0121]

As described above, the action mechanism and the keyboard instrument according to the present invention can be designed to reduce the vertical height and depth of the action mechanism portion while suppressing the displacement of the hitting position, and to reduce the number of parts and the number of assembly steps. The repetition (continuous hitting function) can be improved while maintaining the advantage of being able to do so.

Note that the keyboard instrument employing this mechanism can stabilize the tone and improve the performance quality even in the flip-up type because the displacement of the striking position is reduced, so that the performance can be improved only in a normal concert. Instead, it can be used as a keyboard instrument for professional concerts. In addition, the action mechanism is small in height and depth, and can be easily manufactured as a portable keyboard instrument. further,
Repetition (repeat function)
, So that high quality performances can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing an action mechanism used for a keyboard instrument according to a first embodiment of the present invention.

FIG. 2 is a side view of the action mechanism of FIG. 1 as viewed from the opposite side.

FIG. 3 is a partially exploded perspective view showing a relationship between a hammer body and a keyboard body in the action mechanism of FIG. 1;

FIG. 4 is a partially exploded perspective view illustrating a relationship between an escapement member and a rotating member in the action mechanism of FIG. 1;

FIG. 5 is a perspective view of a rotating member in the action mechanism of FIG. 1 and a perspective view showing each part.

6 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of a hammer body and a periphery of the hammer body in a stationary state.

FIG. 7 is a view for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engaging step in a stationary state.

FIG. 8 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the hammer body and the vicinity of the hammer body in a state where the keyboard is slightly depressed.

9 is a view for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engagement step in a state where the keyboard is slightly pressed down.

FIG. 10 is a view for explaining the operation of the action mechanism of FIG. 1; the hammer in a state in which the keyboard portion is further depressed and the beak-shaped projection of the hammer body reaches the curved surface of the engaging step of the escapement member; It is the elements on larger scale around a body and a hammer body.

FIG. 11 is a view for explaining the operation of the action mechanism of FIG. 1; the beak in a state in which the keyboard portion is further depressed and the beak-shaped projection of the hammer body reaches the curved surface of the engaging step of the escapement member; It is the elements on larger scale of the periphery of a convex piece and an engagement step part.

FIG. 12 is a view for explaining the operation of the action mechanism of FIG. 1; the keyboard is further pushed down, the roller support rod of the rotating member rides on the base of the keyboard, and the rotating member follows the movement of the keyboard. FIG. 4 is a partially enlarged view of a hammer body and a periphery of the hammer body in a state where the hammer body is in a state of being moved.

FIG. 13 is a view for explaining the operation of the action mechanism of FIG. 1, wherein the keyboard portion is further pushed down, the roller support rod of the rotating member rides on the base of the keyboard body, and the rotating member follows the movement of the keyboard body. FIG. 4 is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engagement step portion in a state where the protrusion is formed.

FIG. 14 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of a hammer body and a periphery of the hammer body at the time of string striking.

FIG. 15 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engaging step at the time of string striking.

FIG. 16 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the hammer body and the periphery of the hammer body in a state where the hammer body has reached the hammer stop position by the hammer return operation.

FIG. 17 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the periphery of the beak-shaped protruding piece and the engaging step in a state where the hammer body has reached the hammer stop position by the hammer return operation. is there.

FIG. 18 is a view for explaining the operation of the action mechanism of FIG. 1; the hammer body and a portion around the hammer body in a state where the hammer body starts to return downward from the hammer stop position by the keyboard part starting to return to the original position; It is an enlarged view.

FIG. 19 is a view for explaining the operation of the action mechanism of FIG. 1 and engages with a beak-shaped protruding piece in a state in which the hammer body starts to return downward from the hammer stop position when the keyboard starts to return to its original position. It is the elements on larger scale of the periphery of a step part.

20 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the hammer body and the vicinity of the hammer body immediately before a re-stringable position.

FIG. 21 is a diagram for explaining the operation of the action mechanism of FIG. 1, and is a partially enlarged view of the vicinity of a beak-shaped protruding piece and an engaging step just before a re-stringable position.

FIG. 22 is a plan view of the action mechanism shown in FIG. 1 in a state where components disposed above a keyboard body and members such as a hammer body and an escapement member have been removed;

FIG. 23 is a side view showing an action mechanism used in the keyboard instrument of the second embodiment of the present invention.

FIG. 24 is a plan view showing a modified example of the keyboard in the action mechanism used in the keyboard instrument of the present invention shown in FIG. 1 and the like.

FIG. 25 is a plan view showing another modification of the keyboard in the action mechanism used in the keyboard instrument of the present invention shown in FIG. 1 and the like.

FIG. 26 is a view showing a modification of the hammer body in the action mechanism used in the keyboard instrument of the present invention shown in FIG. 1 and the like.

FIG. 27 is a side view showing an action mechanism used in a conventional flip-up keyboard instrument and its operation, and is a side view showing a stationary state immediately before the start of keying.

FIG. 28 is a side view showing a state immediately before string striking in the conventional action mechanism shown in FIG. 27;

29 is a side view showing a state at the time of string striking in the conventional action mechanism shown in FIG. 27.

30 is a side view showing a state in which the hammer body in the conventional action mechanism shown in FIG. 27 is deenergized by backcheck after striking a string.

FIG. 31 is a side view showing an action mechanism used for a keyboard instrument disclosed in Japanese Patent No. 3035826;

FIG. 32 is a perspective view showing a keyboard body and a hammer body in the action mechanism of FIG. 31.

FIG. 33 is a side view showing a main part of the action mechanism of FIG. 31;

FIG. 34 is a side view showing a state immediately before string striking in the action mechanism of FIG. 31.

FIG. 35 is a side view showing a state at the time of string striking in the action mechanism of FIG. 31.

36 is a side view showing a state in which the hammer body in the action mechanism of FIG. 31 is stopped by the restraining member after striking the string.

FIG. 37 is a side view showing an action mechanism used in another keyboard instrument disclosed in Japanese Patent No. 3035826.

FIG. 38 is a side view showing an action mechanism used for a keyboard instrument developed earlier by the present inventors.

FIG. 39 is an enlarged perspective view of a hammer part of the hammer body and a sound source body of the action mechanism of FIG. 38;

40 is a diagram showing a hammer part of the hammer body and a sound source body part of the action mechanism of FIG. 38 in a state of being overlapped from the back surface of the hammer part.

[Description of Signs] 1 Action mechanism 2 Keyboard part 3 Keyboard body 4 Pin (oscillation fulcrum, holding point) 5 String (sound source body) 6 Hammer part 7 Hammer body 8 Coil spring (biasing means) 9 Escapement member 10 times Moving member 31 Protrusion piece (beak-shaped protruding piece) 32 Extrusion projection (extrusion member) 33 Engagement / disengagement part 36 Cushion part (part of extrusion projection) 37 Cushion part (part of engagement / disengagement part) 41 Engagement step part 42 Suppression Part (part of suppression member) 47 Suppression member 51 Sliding material (part of engagement step) 63 Roller (blocking part)

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 23

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 24

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 25

[Correction method] Change

[Correction contents]

FIG. 25

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] FIG. 26

[Correction method] Change

[Correction contents]

FIG. 26

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] FIG. 27

[Correction method] Change

[Correction contents]

FIG. 27

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] FIG. 28

[Correction method] Change

[Correction contents]

FIG. 28

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] FIG. 29

[Correction method] Change

[Correction contents]

FIG. 29

[Procedure amendment 9]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 10]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 31

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] FIG. 32

[Correction method] Change

[Correction contents]

FIG. 32

[Procedure amendment 12]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 33

[Procedure amendment 13]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 34

[Procedure amendment 14]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 35

[Procedure amendment 15]

[Document name to be amended] Drawing

[Correction target item name] Fig. 36

[Correction method] Change

[Correction contents]

FIG. 36

[Procedure amendment 16]

[Document name to be amended] Drawing

[Correction target item name] Fig. 37

[Correction method] Change

[Correction contents]

FIG. 37

[Procedure amendment 17]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 38

[Procedure amendment 18]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 39

[Procedure amendment 19]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 40

[Procedure amendment 20]

[Document name to be amended] Drawing

[Correction target item name] FIG. 41

[Correction method] Deleted

Claims (8)

[Claims] An intermediate portion in the longitudinal direction of a keyboard body having a keyboard portion at one end portion or the other end portion of the keyboard body is slidably held, and the keyboard portion is sandwiched between holding points of the keyboard body. On the opposite side or in the same direction, the base of the hammer body is rotatably mounted on the shaft, and a beak-shaped protruding piece is protruded from the base end of the hammer body. An engagement step is formed on the escapement member which is constantly urged by the driver, and the shaft attaching portion of the hammer body follows the movement of the keyboard body in accordance with the keying operation of the keyboard part, and the hammer body rotates. The beak-shaped projecting piece of the body and the engaging step of the escapement member are engaged with each other, and the hammer body is configured to perform a rotating operation, wherein at least the hammer body and the escapement member Either one is associated with the rotation of the hammer body. An extruding member for extruding the escapement member to the opposite side with respect to the hammer body and disengaging the beak-shaped protruding piece of the hammer body from the engaging step is provided, and is capable of engaging and disengaging with the hammer body. A rotating member is rotatably attached to the escapement member, and an urging means for urging the rotating member to rotate in a certain direction is provided. The action mechanism is characterized in that the engaging step portion can be re-engaged with the beak-shaped projection piece early. 2. Suppression that the hammer body is separated from the sound source body or the highest rotation position and stopped in a state where the beak-shaped protruding piece is separated from the engaging step portion so as to freely contact and separate from the hammer body. The action mechanism according to claim 1, wherein a member is provided on the escapement member. 3. A keyboard body having a keyboard portion at one end thereof, a middle portion in the longitudinal direction or the other end portion being held to be swingable, and the keyboard sandwiching a holding point of the keyboard body. A hammer body having a base portion rotatably fixed to a side opposite to or in the same direction as the portion and having a hammer portion, and an escapement member constantly biased toward the hammer body, the hammer body comprising: A protrusion is provided on the opposite side of the hammer portion with respect to the rotation fulcrum of the body, and an engagement step portion is provided on the escapement member to engage with the protrusion, and the key operation of the keyboard portion causes When the rotation fulcrum of the hammer body rotates in the hitting direction, the projecting piece of the hammer body engages with the engaging step of the escapement member so that the hammer body rotates. In the configured action mechanism, it can be disengaged from the hammer body The rotating member is rotatably attached to the escapement member, and an urging means for urging the rotating member to rotate in a predetermined direction is provided. An action mechanism, wherein the action step is locked by a moving member so that the engaging step can re-engage with the protruding piece early. 4. At least one of the hammer body and the escapement member pushes the escapement member to the opposite side with respect to the hammer body in accordance with the rotation of the hammer body, and 4. The action mechanism according to claim 3, further comprising: an extruding member for detaching the protruding piece from the engaging step. 5. When the hammer body starts rotating, the rotating member rotates together with the escapement member against a biasing force of the biasing means to extend,
Immediately before the hammer hits the sound source or immediately before the highest rotation position, the turning member follows the movement of the keyboard,
5. The action mechanism according to claim 1, wherein the rotation of the escapement member is further stopped even after the rotation of the escapement member is stopped, and the urging means is further compressed. 6. The rotating member is provided with a cylindrical blocking portion for blocking a return operation of the hammer body, and a roller support rod connected to a position parallel to the blocking portion of the rotating member is provided. The action mechanism according to any one of claims 1 to 5, wherein a base portion on which the rotating member is mounted is provided on the keyboard body. 7. A part of the rotating member is interposed between the urging means and the escapement member, and the urging force of the urging means is transmitted to the escapement member via the rotating member. 7. The action mechanism according to claim 1, wherein the escapement member is constantly urged toward the hammer body. 8. A keyboard instrument comprising the action mechanism according to claim 1. Description: