JP2016099612A - Action mechanism of upright piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an action mechanism that improves sound quality associated with a dynamic range etc., adaptively to any keying such as same-sound successive keying on a keyboard of an upright piano, a pianissimo play, a half-touch play, and successive keying, a half-touch, etc., in use of a damper.SOLUTION: One hammer butt spring 7 is increased in spring force or two hammer butt springs 7 are used. When the two hammer butt springs 7 are used, a butt flange cord 10 is provided with a torsion part and then hook parts of the two hammer butt springs 7 are locked to a ring-shaped part at the tip of the torsion part and the torsion part. While a material having superior lubricity is used as a raw material of a hammer butt skin, a jack spring 21 is increased in elastic force, and a rubber-based cushion member 13 is added which has a projection part having a through hole formed in an elastic raw material along a rear face of a jack stop rail 9 and a front face and a rear face of a damper stop rail 16.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to an action mechanism of an upright piano, and is an action mechanism of an upright piano that improves the sound quality related to the same tone repeatability, half touch, dynamic range, etc. when the keyboard is continuously pressed down. About. In the following description, the near side is referred to as the front and the far side is referred to as the rear as viewed from the piano playing side.

  In a conventionally known grand piano, a string is stretched horizontally, and after a hammer that rotates the string rearward is struck, the hammer can quickly return to its original position by its own weight. The grand piano uses a double escapement action in which a jack and a repetition lever that pulls the jack down to the hammer escapes. For this reason, the grand piano is capable of quick repeatability.

  On the other hand, in an upright piano, the strings are stretched vertically, and when the jack pushes up the hammer bat in conjunction with the operation of pushing down the keyboard, the hammer supported by the hammer bat rotates in the direction of the string, Is configured to strike a vertically stretched string. Therefore, in the upright piano, since the weight of the hammer is difficult to act like a grand piano, the hammer is forcibly returned to the original position by a spring force to prepare for the next key depression. For this reason, the upright piano has a complicated structure and has a disadvantage that it is inferior to a grand piano in terms of repeatability.

  However, the vertical upright piano is more compact than the horizontal grand piano and has the advantage of being cheaper than the grand piano in terms of price. Various improvements have been made in the past in order to improve the sound quality, and to realize a dynamic range in terms of sound quality and touch when pressing keys like a grand piano.

  Therefore, Patent Document 1 is referred to as a conventional technique. In this document, the hammer bat spring is biased forward to urge the hammer bat that supports the hammer forward to turn the hammer forward after turning the hammer backward. It is what you do. For this reason, in this document, a stopper is provided at the lower portion of the hammer butt flange cord that supports the hammer butt spring. However, in this document, in addition to the existing parts, it is necessary to provide a stopper separately, so that the structure of the hammer bat spring becomes more complicated.

  In the present invention, in order to improve the upright piano, not only a newly manufactured upright piano but also an existing upright piano can be attached by a piano tuner or the like. It is desirable to have a structure that can be easily improved rather than a structure that complicates the action mechanism of an upright piano having a simple structure.

  In Patent Document 2, a hammer bat, a rocking shank (hammer shank), and a rocking member, which are members constituting an action mechanism of an upright piano, are realized in order to realize a touch feeling rich in mass like a grand piano. (Weighter), catcher, and catcher shank are configured to have a weight attached to one of the operating members. In such a configuration, each weight is attached so as to apply a load in a direction opposite to the rotation direction of the operation member at the time of key depression, thereby making the touch feeling at the time of key depression equivalent to that of a grand piano. I am doing so.

  However, this touch feeling is a feeling felt on the fingers of the performer. More importantly, it is a well-known drawback of upright pianos to improve the phenomenon of no sound when half-touching, i.e. after pressing down the keyboard, without returning it to the non-keyed height. Even when the keyboard is depressed again at an intermediate height, it is desirable to improve the sound so that the weakest sound like pianissimo can be produced.

JP 2008-90169 A JP 2011-203477 A

  In the above upright piano, it is necessary to completely return the keyboard to its original height in order to produce the next sound after pressing the key. However, in the conventional upright piano, when the hammer hits repeatedly, the hammer bat returns faster than the hammer bat returns to the lower side of the hammer bat, preventing the return of the jack. Jack hits the ball without pushing up the hammer bat.

  For this reason, it is necessary to quickly return the jack in order to enable the keyboard to be played repeatedly even with an upright piano and to produce the weakest sound like pianissimo by half touch. However, in order to assist the return of the jack, for example, if only the jack spring is improved, there is a disadvantage that a time lag occurs in the operation of other parts. It needs to be improved in general.

  The present invention has been made in view of the above-described circumstances, and the same-pitched hitting performance, pianissimo playing, half-touch playing when using a keyboard in an upright piano continuously, half-touching when using a damper, and half-touch. It is an object of the present invention to provide an action mechanism of an upright piano that can cope with all key depressions such as the above and further achieves an improvement in sound quality related to a dynamic range or the like.

In order to achieve the above object, the action mechanism of the upright piano according to claim 1 of the present invention is a jack that pushes upward in conjunction with a push-down operation of the keyboard, and a string side by the push-up operation of the jack. A hammer bat that pivots backward, a hammer shank supported by the hammer bat, a hammer that strikes the string at the tip of the hammer shank, a damper stop rail that brakes the movement of the damper wire, and a push-up surface of the hammer bat The hammer bat skin provided, the hammer bat spring for urging the hammer forward after stringing, the jack spring for urging the jack in the reverse direction opposite to when the key is depressed, and the jack after the key is depressed A jack stop rail that regulates the tilt and controls the range of movement of the jack In the upright piano action mechanism having,
Strengthen the spring force of one hammer bat spring or use two hammer bat springs, and when using two hammer bat springs, twist the bat frenzy cord by providing a twisted portion. The hook part of the two hammer bat springs are hooked on the ring-shaped part and the twisted part at the tip of the hook part, and the material having excellent lubricity is used as the material of the hammer bat skin, while the elasticity of the jack spring , And the jack member immediately after escape from the bat skin hits the cushion member provided along the rear surface of the jack stop rail to elastically urge the return of the jack, and further to the front and rear surfaces of the damper stop rail. The hammer shank and damper wire when hitting the string hit the cushion member attached along the Resisting the movement of the hammer shank and damper wire and energizing the elastic force in the return direction of the hammer shank and damper wire, it was installed along the rear surface of the jack stop rail and the front and rear surfaces of the damper stop rail. Each of the cushion members is a long rubber-based cushion member that has a protruding portion provided with a through hole inside the elastic member so as to exert an elastic force related to a resistance force and an original restoring force. And

  Further, the action mechanism of the upright piano according to claim 2 of the present invention is characterized in that, as the material of the hammer bat skin having excellent lubricity, the iron platter is applied to the bat skin and the graphite is applied. It is characterized by using a synthetic leather excellent in lubricity or processed into an excellent material.

  Furthermore, the action mechanism of the upright piano according to claim 3 of the present invention is the EPDM as a rubber cushion member provided along the rear surface of the jack stop rail and the front and rear surfaces of the damper stop rail according to claim 1 or 2. (Ethylene propylene diene rubber) is used.

  According to the present invention, by strengthening the elastic force of the hammer bat spring, it is possible to quickly return the hammer bat to the next push-up posture by the jack. , Pianissimo performance and the same-tone repeatability and half-touch when using a damper) will be beneficial.

  In addition, as a material of the hammer bat skin, the jack is removed from the push-up surface of the hammer bat by processing it into a material having excellent lubricity as in the present invention or using synthetic leather having excellent lubricity. As a result, the response of the hammer bat movement is improved. As a result, the return speed for quickly returning to the next push-up state by the jack can be improved, and the touch feeling at the time of key depression as described above is increased, and the number of repeated beatings at the time of performance is increased. This is useful for achieving touch, especially pianissimo performance, and half-touch.

  In addition, by strengthening the elastic force of the jack spring, the return of the jack becomes quicker, so that the jack quickly stands by at the lower part of the push-up surface of the hammer bat, which is useful for realizing the same-tone repeatability and half-touch. It becomes.

  In addition, when pressing keys with pianissimo or half-touch, the jack is pushed down to the lowest position and the jack immediately after escape from the bat skin hits the cushion member attached along the rear surface of the jack stop rail. By the resistance of the member, it is possible to restrict the range of movement of the jack to a range immediately after escape from the bat skin, thereby making it possible to ensure continuous hitting and to express a delicate tone.

  Also, when pressing the key with fortesimo or all-touch, the jack immediately after escape from the bat skin hits a cushion member provided along the rear surface of the jack stop rail to elastically bias the return of the jack, When the keyboard is loosened, the jack returns to the position immediately after escapement (below the bottom surface of the hammer bat) due to the original restoring force and elasticity of the cushion member. It is possible to quickly return to the lower part of the keyboard, enabling continuous striking of the strings and improving the accuracy of the key pressing function, thereby enabling dynamic range performance.

  In addition, the hammer shank hits the cushioning member attached along the front and rear surfaces of the damper stop rail to give resistance to the movement of the hammer shank and to urge the elastic force in the return direction of the hammer shank. Thus, by giving resistance to the movement of the hammer shank in a state where the keyboard is pushed down to the lowest position by pianissimo or half-touch, it is possible to reproduce aftertouch unique to the grand piano even in an upright piano.

  Further, since the hammer shank is elastically biased in the return direction by the elastic force of the cushion member when hit by the hammer shank when striking the string, it is possible to assist the hammer to make a quick and delicate movement. It becomes possible.

  In addition, the after touch mentioned above refers to a touch feeling that can be felt in the middle of playing the keyboard in the structure of the grand piano. In the conventional upright piano and the electronic piano, this after touch is completely different. I couldn't feel it.

  However, the cushion member provided along the front surface and the rear surface of the damper stop rail according to the present invention exhibits a resistance force and an elastic force related to the original restoring force by having a protruding portion provided with a through hole inside the elastic member. The cushion member can flexibly cope with any key depression. Therefore, at the initial stage when the hammer shank at the time of striking hits the cushion member, the protrusion provided with the through hole of the cushion member is pressed with a weak pressing force, and a strong elastic force is applied in the latter stage when the protrusion is pressed. It is possible to reproduce the above-mentioned aftertouch by demonstrating and releasing the keyboard depression.

  Therefore, according to the present invention described above, synergistic improvement for speeding up the return speed of the jack is possible, and it is possible to make the same tone repeatability equal to or higher than that of the grand piano.

  Furthermore, it is possible to make the half touch when pressing down the same key again after the key press is equal to or greater than that of the grand piano, and the sound quality can also be improved in the dynamic range. Become.

  In addition, according to the present invention, since it is possible to improve each part by using the existing members as they are, not only when newly manufacturing an upright piano, but also repairing each part of the existing piano, A used piano or a piano used by a user can be easily improved by the present invention.

It is a side view which shows the action mechanism of the upright piano in the Example of this invention. It is the elements on larger scale regarding the action mechanism of the upright piano in the Example of this invention. In the action mechanism of the upright piano in the embodiment of the present invention, (a) is an overall view of the hammer bat spring, (b) and (c) are rear views of the hammer bat to which the hammer bat spring is attached, (d) and ( e) is a front view of a hammer bat frenzy with a butt frenzy cord attached, and (f) is a view of the configuration of (c) as seen from the side. (a) (b) is a partial side view for demonstrating the hammer bat spring of a hammer bat, a hammer bat skin, etc. in the action mechanism of the upright piano in the Example of this invention, (c)-(f) These are the perspective view and side view for demonstrating the cushion member provided along the front surface and rear surface of a damper stop rail. (a) and (b) are the partial side views for demonstrating the relationship between the hammer bat skin and the jack in the action mechanism of the upright piano in the Example of this invention. (A)-(e) is a partial side view for demonstrating the jack stop rail and cushion member in the action mechanism of the upright piano in the Example of this invention.

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

  First, the overall configuration relating to the action mechanism of the upright piano of this embodiment will be described. In FIG. 1, the white key 1a constituting the keyboard 1 provided on the player's side previously used ivory, and is today made of methacrylic resin (trade name acripet or acrylic). In addition, the keyboard 1 is arranged based on the rule of all, all, half, all, all, all, half (all = full scale, half = semitone) for one octave, eight white keys 1a, black keys 1b Are assigned to five. As the material of the black key 1b, ebony has been used in the past, and phenol resin is generally used at present.

  Further, a front bushing cloth 2a is provided in a recess formed near the tip of the white key 1a. When the key is depressed, the front bushing cloth 2a hits a front pin 2b provided at the lower portion thereof, thereby The left and right positions are stabilized. The front pin 2b is formed in an oval shape, which is also called an oval pin, and the friction of the front bushing cloth 2a is reduced by increasing the contact area.

  A front punching cloth 2c is attached to the lower part of the keyboard 1 so as to prevent noise from being generated when the keyboard 1 is pressed when hitting the front pin 2b. The keyboard bowl 2d is a base on which the keyboard 1 is placed. Further, the back rail cross 1c provided at the lower part of the rear end of the keyboard 1 functions as a cushioning material that regulates the position of the height and depth of the keyboard and prevents noise when the keyboard 1 returns.

  Further, a keyboard seat plate 4 is provided in the approximate center of the keyboard 1, and a balance hole (not shown) is formed in the keyboard seat plate 4 through which a balance pin 4b fixed to the pedestal 4a is passed. In general, a red balance bushing cross 4c is attached with the balance pin 4b sandwiched therebetween, and the movement of the keyboard 1 is stabilized by an appropriate gap and slip of the balance bushing cross 4c. Each keyboard 1 is supported by a balance punching cloth 4d provided on the upper portion of the pedestal 4a, and functions as a cushioning material for preventing noise at the time of key pressing, and is also important for adjusting the height of the keyboard 1.

  Further, a wooden base 1d behind the keyboard seat is provided at the upper rear end of the keyboard 1, and the capstan button 5 is fixed via a post wire 5a supported on the upper part. As shown in FIG. 2, the capstan button 5 is a vertically long part having a round upper part, and has a role of transmitting the upward movement of the keyboard 1 to the action mechanism on the upper part. By adjusting the capstan button 5 in the vertical direction, the force generated by the movement of the keyboard 1 is transmitted without loss.

  Further, as shown in FIG. 2, a wipen heel 6a fixed to the lower portion of the wipen 6 is provided above the capstan button 5, and a wipen heel cross 6b provided in the lower portion or the recess of the wipen heel 6a is a capstan button. 5 is lifted at the top. At this time, the wipen heel cross 6b functions as a cushioning material for preventing noise between the wipen heel 6a and the capstan button 5.

  In addition, a damper spoon 18 is attached in front of the upper portion of the wipen 6. The damper spoon 18 has a function of moving the damper assembly 8. When the key is pressed, the damper spoon 18 is moved rearward, and the damper lever 8 a contacting the string 19 is separated from the string 19, so that the damper head 11 has a damper. The felt 11c is separated from the string 19 so that the string 19 can vibrate. Note that, by finely adjusting the damper spoon 18 back and forth, the degree of engagement of the damper spoon 18 with respect to the damper lever 8a changes, and the touch of the keyboard 1 changes. Generally, the touch feels heavier when the engagement state of the damper spoon 18 is faster, and the touch feels lighter when the damper spoon 18 is late.

  As shown in FIG. 2, the damper lever 8a is attached to a damper flange 8b fixed to the upper end of the center rail 14 so as to be rotatable by a damper flange center pin 8c, and is attached to the upper side via a damper wire 11d. The damper wood 11a is fixed to the rear damper block 11b. The damper lever 8a is provided with a damper spring 8d, and the damper spring 8d presses the damper felt 11c provided at the rear portion of the damper wood 11a toward the string 19 side. Note that noise occurs when the lubrication of the contact portion between the damper spring 8d and the damper lever 8a is poor.

  A damper stop rail 16 is provided in front of the damper wire 11d. The damper stop rail 16 regulates the movement of the damper wire 11d. In such a configuration, the movement transmitted from the damper spoon 18 also acts as a cushion for the damper wire 11 d that is separated from the string 19.

  On the other hand, a Wipen flange 14a fixed to the center rail 14 is rotatably attached to the upper rear portion of the Wipen 6 by a Wipen flange center pin 14b. Further, a hammer butt flange 15 is fixed to a rear portion above the center rail 14 by a hammer butt flange screw 15a, and a hammer bat 3 is rotatably attached to the upper portion of the hammer butt flange 15 by a hammer butt flange center pin 15b. ing. As shown in FIGS. 3D, 3E and 3F, the hammer butt flange center pin 15b is inserted into a pin groove 3c provided in the hammer bat 3, and a fixing screw is attached to the rear surface of the hammer bat 3. It is fixed with a presser fitting (butt plate) 12 screwed with a (butt plate screw) 12a.

  Further, as shown in FIG. 3 (f), the hammer bat spring 7 attached to the rear portion of the hammer bat 3 has a hammer butt flange cord 10 in which a hook portion 7 a formed at the tip thereof is attached to a hammer butt flange 15. The tension is held by being hooked on the belt. As shown in FIGS. 3D, 3E and 3F, two mounting grooves 15c are formed on the front surface of the hammer butt flange 15, and each end of the hammer butt flange cord 10 is formed in each mounting groove 15c. Are attached by bonding.

  A jack flange 6c is fixed to the upper half of the whip 6 and a jack 20 is rotatably attached to the jack flange 6c via a jack flange center pin 6d. The jack 20 functions to push up the hammer bat 3 at the upper end thereof. Further, a jack tail 20a is formed to protrude forward at the lower front portion of the jack 20, and an upper portion of the jack spring 21 is fitted to a convex portion 20b provided on the lower surface of the jack tail 20a and formed on the upper surface of the wipen 6. The recessed portion 6e is supported and acts to urge the movement of the jack 20 when the key is depressed.

  Further, a hammer bat felt 22a shown in FIG. 3 (f) and a hammer bat skin 22 are provided on the front side of the hammer bat 3, and the hammer bat felt 22a generates noise during the movement of the jack 20. To prevent. Further, the hammer bat skin 22 is formed of a slippery leather so as to make the movement of the jack 20 in contact with the hammer bat skin 22 smooth.

  Further, as shown in FIG. 2, a hammer 23 is attached to the upper portion of the hammer bat 3. The hammer 23 is composed of a hammer shank 23a corresponding to the arm of the hammer 23, a hammer wood 23b which is a base portion of the hammer 23, and a hammer felt 23c which makes a sound by hitting the string 19 also called a music wire. Yes.

  The hammer rail 26 is attached to the action bracket 28 in order to stabilize the hammer 23 that has been restored after the string is hit. A hammer felt 26a is fixed to the rear portion of the hammer rail 26 as a cushioning material, and the hammer shank 23a is fixed to the hammer rail 26. The generation of a collision sound when returning to the side is prevented.

  Next, as shown in FIG. 2, a wooden catcher 24 having a catcher skin 24b bonded to the front side is fixed to the front end of the catcher shank 24a attached to the front side of the hammer bat 3. On the other hand, a back check 25 is provided in front of the catcher 24 via a back check wire 25 a attached to the wipen 6. A back check felt 25 b is provided on the rear surface of the back check 25. Further, a bridle tip 24d is provided at the end of the band-shaped bridle tape 24c attached to the catcher 24, and this bridle tip 24d is locked to the tip of a bridle wire 24e erected upward from the wiper 6. .

  With such a configuration, after the hammer 23 is struck, the catcher 24 is stopped by the back check felt 25b of the back check 25 via the catcher skin 24b, so that the movement of the hammer 23 after struck is stopped. . The position before and after the hammer 23 strikes the string 12 is determined by the position before and after the catcher 24 is stopped. At this time, the catcher skin 24b absorbs the impact, and the back check felt 25b also absorbs the impact to prevent noise.

  The upright piano has a vertically arranged action mechanism, so it is difficult to return to its original position due to its own weight like a grand piano. Auxiliary parts such as the bridle tape described above are required to quickly return to the original position.

  In addition, a damper rod 29 is fixed to the rear part in the middle of the center rail 14, and the damper rod 29 is connected to a damper pedal (not shown). The damper pedal is the rightmost long sound pedal among the three pedals provided on a general piano. When the damper pedal is depressed, the dampers move all at once, and the sound after the key depression is extended. Also, when the damper pedal is released, the damper returns and the extended sound stops. A damper lever cross 8e that abuts against the damper spoon 18 is attached to the lower part of the damper lever to prevent friction with the damper spoon 18 to prevent the generation of noise.

  On the other hand, a regulating screw 27 is fixed to the front side in the middle of the center rail 14. The regulating screw 27 can be turned in the left and right directions with a dedicated tool, and the push-up angle of the jack 20 can be adjusted. Specifically, when the counterclockwise direction is turned counterclockwise, the regulating button 27a attached to the regulating screw 27 moves upward, and the time until contact with the jack tail 20a is extended. As the time for the escape of the 20 extends and the escape of the hammer 23 approaches the string 19, the time transmitted to the hammer 23 becomes longer. As a result, the volume increases and the control of pianissimo during performance is facilitated. On the other hand, when the regulating screw 27 is turned clockwise, the regulating button 27a moves downward, which is the opposite effect.

  With such a configuration, it is possible to control the movement of the jack tail 20a provided in the jack 20 and change the movement of the hammer 23 by the jack 20 applied by pressing the key. The adjustment of the regulating screw 27 is called an approach adjustment and is important in the action adjustment of the upright piano. For this reason, when the jacktail 20a rises, the position where the jacktail 20a is securely held at the center of the cross provided at the lower end of the regulating button 27a is important. When the key is pressed, the jacktail 20a is lifted upward and hits the regulating button 27a so that the hammer 23 approaches the string 19 and the escape position of the hammer 23 before contacting the string 19 is determined. If the hammer 23 is too close to the string 19, it will stop sounding, and if it is too far away, the expression of forte, especially pianissimo will be worse.

  The action mechanism is held at a predetermined height by an action bracket 28 attached to the piano body side by an action bolt nut 28a.

  In the action mechanism of the upright having the above structure, in this embodiment, in order to reinforce the elastic force of the hammer bat spring 7, the elastic force of one hammer bat spring 7 is strengthened as shown in FIG. Or two hammer butt springs 7 are used.

  That is, when one hammer bat spring 7 is used, as shown in FIG. 3A, an elastic wire made of phosphor bronze having a diameter larger than that of the conventional hammer bat spring 7 is used, and a hook portion 7a is formed at one end. And the other end is provided with a winding part 7b in which two to three windings of wire are provided, and a hammer butt spring 7 is formed by projecting a linear overhanging part 7c from the winding part 7b.

  Next, in order to attach one hammer bat spring 7, as shown in FIG. 3 (b) or FIG. 4 (a), a felt part provided with a winding part 7b of the hammer bat spring 7 on the hammer bat 3, etc. The hammer butt spring pin cord 3a is attached, the overhanging portion 7c is supported on the back portion 3b of the hammer bat 3, and the hook portion 7a is hooked on the hammer butt flange cord 10. With such a configuration, it is possible to strengthen the elastic force more than the conventional hammer butt spring 7.

  Further, as shown in FIG. 3 (c) or (f), when two hammer bat springs 7 are used, the diameter of the elastic wire made of phosphor bronze or the like is the same as that of the conventional one or an elastic wire having an adjusted diameter. As shown in FIG. 3A, a hook portion 7a is formed at one end, and a winding portion 7b and an overhang portion 7c are formed at the other end.

  3 (c), (f) or FIG. 4 (b), the first hammer butt spring 7 (1), second Hammer bat spring 7 (2), hook portion 7a (1) as each portion related to the first hammer bat spring 7 (1), and hook portion 7a as each portion related to the second hammer bat spring 7 (2). (2) Add (1) or (2) after a number or alphabet.

  As shown in FIG. 3 (f) or FIG. 4 (b), the winding portion 7b (1) of the first hammer butt spring 7 (1) is attached by the hammer butt spring pin cord 3a of the hammer bat 3 and is extended. The portion 7 c (1) is supported on the back portion 3 b of the hammer bat 3. Further, the projecting portion 7c (2) of the second hammer bat spring 7 (2) is connected to the winding portion 7b (1) and the hammer from above the winding portion 7b (1) of the first hammer bat spring 7 (1). By inserting it between the back surface portion 3b of the bat 3, it is brought into a state of being hooked on the winding portion 7b (1) of the first hammer bat spring 7 (1). By doing so, it is possible to easily attach the second hammer butt spring 7 (2) only by preparing it separately. At this time, the overhanging portion 7c (1) of the first hammer butt spring 7 (1) and the overhanging portion 7c (2) of the second hammer bat spring 7 (2) are bonded to the back portion 3b of the hammer bat 3. It is good to fix.

  Further, a twisted portion 10a is provided as shown in FIG. 3 (e) at the tip of the normal hammer butt flange cord 10 in FIG. 3 (d), as shown in FIG. 3 (c) or FIG. 3 (f). The hook portions 7a (1) and 7a (2) of the two hammer bat springs 7 (1) and 7 (2) are respectively attached to the ring-shaped portion 10b and the twisted portion 10a formed at the tip of the twisted portion 10a. Hang. In this case, the second hammer butt spring 7 (2) is formed to have the same length as that of the first hammer butt spring 7 (1), and the hammer butt flange cord 10 is formed to be slightly longer. The hook portion 7a (1) of the first hammer butt spring 7 (1) is hooked on the twisted portion 10a shown in FIG. 2 and the hook portion 7a (2) of the second hammer butt spring 7 (2) is hooked on the ring-shaped portion 10b. ).

  As described above, even when one large diameter hammer butt spring 7 is used or when two hammer butt springs 7 (1) and 7 (2) are used, the conventional one hammer bat spring is used. The elastic force is strengthened compared with the case where it is used, and it becomes possible to quickly return the hammer bat 3 to the next push-up posture by the jack 20, and the increase in the number of simultaneous hits at the time of performance and half-touch (especially pianissimo performance and This is useful for achieving the same-tone repeatability and half-touch when using a damper.

  In this embodiment, as the material of the hammer bat skin 22 having excellent lubricity shown in FIGS. 5 (a) and 5 (b), a hammer is applied to the hammer bat skin to apply graphite, or it is thinner than deer skin. It is preferable to use synthetic leather such as polyurethane having excellent lubricity.

  In the above configuration, as shown in FIGS. 5A and 5B, the hammer bat 3 has an under cloth 22b and an under felt 22c attached to a recess formed in the push-up surface 17 at the lower front portion thereof. The hammer bat skin 22 has a configuration in which the hammer bat skin 22 is attached in an inclined manner so as to cover the under cloth 22b and the under felt 22c. Accordingly, the elasticity of the undercross 22b and the under felt 22c improves the biting of the tip of the jack 20 that is in contact with the hammer bat skin 22, and the jack 20 is raised in this biting state, so that the hammer bat 3 is pushed up. Is enhanced, and the touch feeling when the key is depressed can be improved.

  Further, the frictional resistance between the tip of the jack 20 and the hammer bat skin 22 is reduced due to the lubricity of the hammer bat skin 22, and when the jack tail 20a is in contact with the regulating button 27a and the tip of the jack 20 reaches the inclined surface, The jack 20 slides out of the inclined surface of the hammer bat skin 22 at a stroke and is detached. At this time, since the push-up force of the jack 20 is suddenly weakened, the performer gets a touch feeling that the key press resistance is suddenly released when the keyboard 1 is pushed down.

  Such an operation of the jack 20 improves the removal of the hammer bat 3 from the push-up surface 17, and as a result, the reaction of the movement of the hammer bat 3 becomes better. The speed can be improved. This improves the touch feeling when the key is pressed as described above, and increases the number of repeated strikes during performance, and is useful for achieving half-touch (especially pianissimo performance and repeatability and half-touch when using a damper). It becomes.

  Further, in this embodiment, as shown in FIG. 6 (b), the narrow diameter portion 21 a at the upper portion of the jack spring 21 is fitted into the lower convex portion 20 b of the jack tail 20 a of the jack 20, and the concave portion 6 e on the upper surface of the wipen 6. Thus, the small-diameter portion 21b below the jack spring 21 is supported. In such a configuration, it is possible to adjust the elastic force of the jack spring 21 by shifting the upper and lower positions where the small diameter portion 21a at the upper portion of the jack spring 21 is fitted into the convex portion 20b of the jack tail 20a. Moreover, it is also possible to increase the elastic force of the jack spring 21 by increasing the number of turns of the jack spring 21 from 1 to 2, for example, from the conventional 13 turns.

  With such a configuration, the jack 20 can be returned quickly, so that the jack 20 is quickly waiting at the lower portion of the push-up surface 17 of the hammer bat 3, which is also beneficial for achieving the same-tone repeatability and half-touch. .

  Further, in the present embodiment, as shown in FIGS. 6A to 6D, the resistance force formed by the protruding portion 13b having the through hole 13a inside the elastic material along the rear surface of the jack stop rail 9 and A long rubber cushion member 13 having an elastic force related to the original restoring force is provided. In addition, the position of the protrusion 13b in the cushion member 13 is provided at the upper portion along the jack stop rail 9 as shown in FIG. 6A, and the jack stop rail 9 as shown in FIG. It may be provided along the jack stop rail 9 or at the center as shown in FIG.

  As a material of the rubber-based cushion member 13, EPDM (ethylene propylene diene rubber) having a light weight and good elastic force may be used. As shown in FIGS. 6A to 6C, the cushion member 13 is long and has one end that is flat, and a protrusion 13b having a through hole 13a at the other end. The shape is advantageous for exerting the elastic force related to the force and the original restoring force. Such a cushion member 13 is attached to the rear surface of the jack stop rail 9 formed of conventional wood or the like, or is attached to the jack stop rail felt 9a fixed to the rear surface of the conventional jack stop rail 9. It is also possible to attach.

  In any case, the jack 20 may be adjusted to the extent that the jack 20 pushes the cushion member 13 by about 2 mm while the keyboard 1 (see FIG. 1) is pushed down to the lowest position. In the case of a small upright piano, there is a configuration in which the above-described jack stop rail 9 is not provided due to space problems, and a regulating rail is used instead. In this case as well, the same effect can be obtained by providing a cushion member 13 similar to the above on the regulating rail.

  With such a configuration, when the keyboard 20 (see FIG. 1) is pushed down to the lowest position and the jack 20 pushes down the cushion member 13 and then the keyboard 1 is released, the cushion member 13 resists and returns to its original state. The jack 20 can quickly return to the lower portion of the push-up surface 17 of the hammer bat 3 by the elastic force related to the force, and the jack 20 can be provided for the next key depression. This is beneficial for achieving a touch feeling with a feeling of omission peculiar to the upright piano when the key is pressed, in particular, achieving pianissimo performance and half-touch when using a damper, and increasing the number of repeated hits.

  Further, in this embodiment, as shown in FIG. 2, a damper stop rail 16 is fixed to the upper part of the action bracket 28 erected at both ends of the action mechanism of the existing upright piano. On the rear surface of the rail 16, a damper stop rail felt 16a for restricting the movement of the damper wire 11d supported by the damper lever 8a is provided. In the present embodiment, with such a configuration, the hammer shank 23a at the time of striking hits the cushion member 13 provided along the front surface of the damper stop rail 16 by using the damper stop rail 16 described above. It is possible to give resistance to the movement of 23a and to bias the elastic force of the hammer shank 23a in the return direction. Furthermore, in this embodiment, the cushion member 13 is also provided on the rear surface of the damper stop rail 16, and the damper wire 11d hits the cushion member 13 (presses about 1 mm), thereby providing an elastic force in the return direction of the damper wire 11d. The wiper 6 is urged to return via the damper spoon 18.

  In the above configuration, the cushion member 13 provided along the front and rear surfaces of the damper stop rail 16 shown in FIGS. 4A and 4B (the action bracket 28 is not shown in these drawings) A cushion member 13 similar to that shown in FIG. Therefore, the cushion material 13 is a long rubber cushion member that exhibits the elastic force related to the resistance force and the original restoring force by forming the protruding portion 13b having the through hole 13a inside the elastic material. 13 is attached.

  Further, in the above configuration, the configuration in which the cushion member 13 is attached to the rear surface of the damper stop rail 16 is specifically, the damper wire 11d pushes the cushion member 13 about 1 mm at a distance of 4 mm away from the damper wire 11d. By attaching to the range, it is possible to promote the return of the damper and assist the return of the entire wiper 6, and in particular, it is possible to promote the same tone repeatability and the half touch when using the pianissimo and the damper pedal.

  In the above case, EPDM (ethylene propylene diene rubber) that is lightweight and has good elastic force may be used as the rubber cushion member 13. Furthermore, the position of the protrusion 13b is provided at the center along the front and rear surfaces of the damper stop rail 16 as shown in FIG. 4 (c), and the front surface of the damper stop rail 16 as shown in FIG. 4 (d). And may be provided at the lower portion along the rear surface, or may be provided at the upper portion along the front and rear surfaces of the damper stop rail 16 as shown in FIG. Although not shown, the position of the protruding portion 13b may be provided on either the upper side or the lower side along the front and rear surfaces of the damper stop rail 16. In addition, it is necessary to attach the cushion member 13 so that it has a feeling of aftertouch and does not hinder string striking.

  In this cushion member 13, at the initial stage (see FIG. 4 (f)) when the hammer shank 23a at the time of striking hits the cushion member 13, the protruding portion 13b provided with the through hole 13a of the cushion member 13 with a weak pressing force. Press. Further, in the latter state where the protruding portion 13b is pressed (the protruding portion 13b is crushed), a strong elastic force is exerted and the keyboard 1 is pushed down. It is possible to reproduce the aftertouch unique to a grand piano even with an upright piano.

  According to the action mechanism of the upright piano according to the above-described embodiment, the parts related to the return speed of the jack 20 are comprehensively improved, so that the return speed of the jack 20 is increased and the range of motion is depressed. Synergistic improvement that can be freely controlled by way is possible. In addition, in the key press test of the upright piano according to the present embodiment, the inventor of the present application has the same-tone repeatability, that is, the repeatability when repeatedly hitting the same keyboard 1 14 times per second equivalent to that of the grand piano, It is confirmed that it is possible to make it more than that.

  Furthermore, as a half touch when the same key 1 is pressed again after the key is pressed, that is, as a half touch equivalent to a grand piano, either a forte or a pianissimo is pressed by pressing a half or a third of the keyboard 1. Even if it is a performance, the same tone repeatability and half-touch can be performed, and the sound quality can also exhibit a remarkable sound quality effect that the expansion of the dynamic range and the like is improved.

  The action mechanism of the upright piano of the present invention is compatible with all key presses such as the same-pitched hitting performance, pianissimo playing, half-touch playing, and continuous hitting and half-touching when using a damper when pressing the keyboard in the upright piano continuously. Furthermore, it can be used as an action mechanism of an upright piano that realizes an improvement in sound quality related to a dynamic range or the like.

DESCRIPTION OF SYMBOLS 1 Keyboard 1a White key 1b Black key 1c Back rail cross 1d Back of keyboard seat board 2a Front bushing cloth 2b Front pin 2c Front punching cross 2d Keyboard bowl 3 Hammer bat 3a Hammer bat spring pin code 3b Back 3c Pin groove 4 In the keyboard seat board 4a Pedestal 4b Balance pin 4c Balance bushing cross 4d Balance punching cross 5 Capstan button 5a Post wire 6 Wipen 6a Wipen heel 6b Wipen heel cross 6c Jack frenzy 6d Jack frenzy center pin 6e Recess 7 Hammer butt spring 7a Hook part 7b Winding part 7c Overhang 7 (1) First hammer butt spring 7 (2) Second hammer butt spring 7
7a (1) Hook 7a (2) Hook 7b (1) Winding 7b (2) Winding 7c (1) Overhang 7c (2) Overhang 8 Damper assembly 8a Damper lever 8b Damper flange 8c Damper flange Center Pin 8d Damper Spring 8e Damper Lever Cross 9 Jack Stop Rail 9a Jack Stop Rail Felt 10 Hammer Butt Flanged Cord 10a Twisted Part 10b Ring Part 11 Damper Head 11a Damper Wood 11b Damper Block 11c Damper Felt 11d Damper Wire 12 plate)
12a Fixing screw (butt plate screw)
13 Cushion member 13a Through hole 13b Protruding part 14 Center rail 14a Wipen frenzy 14b Wipen frenzy center pin 15 Hammer butt frenzy 15a Hammer butt frenzy screw 15b Hammer butt frenzy center pin 15c Mounting groove 16 Damper stop rail felt 17 Damper stop rail felt 17 Push-up surface 18 Damper spoon 19 String 20 Jack 20a Jack tail 20b Convex portion 21 Jack spring 21a Small diameter portion 21b Small diameter portion 22 Hammer butt skin 22a Hammer bat felt 22b Under cross 22c Under felt 23 Hammer 23a Hammer shank 23b Hammer wood 23c Hammer felt 24 Catcher 24a Catcher shank 24b Caterer Char skin 24c bridle tape 24d bridle chip 24e bridle wires 25 back check 25a back check wire 25b back check felt 26 hammer rail 26a hammer felts 27 regulating screw 27a regulating button 28 action bracket 28a Action bolt nut 29 Damper rod

In order to solve the above-mentioned object, an action mechanism of an upright piano according to claim 1 of the present invention includes a jack that pushes upward in conjunction with a push-down operation of the keyboard, and a string side by the push-up operation of the jack. a hammer butt which rotates some backward, and the hammer shank, which is supported by the hammer butt, and hammers striking the strings is provided at the tip of the hammer shank, a damper stop rail to brake the movement of the damper wire, said hammer butt and hammers butt skin provided pushed up surface of the hammer butt spring for biasing the hammer forwardly after striking the string, the jack spring biasing in the opposite return direction to the key pressing the jack, press di controlling the range of motion of the jack as well as regulating the jack slope of the post-key In upright piano action mechanism having a Tsu box top rail, along the rear face of the Jax top rail, according to the resistance and original condition returning force by forming a projecting portion provided inside the through hole of the elastic member A long rubber-based cushion member is provided that exerts an elastic force, and the return of the jack is elastically urged by hitting the jack immediately after retreating from the hammer bat skin. characterized in that the.

The action mechanism of the upright piano according to claim 2 of the present invention is the action mechanism according to claim 1, wherein two elastic wires are used as the hammer bat spring, and a twisted portion is provided in the bat frenzy cord. The hook portions of the two hammer bat springs are hooked on the ring-shaped portion at the tip of the bent portion and the twisted portion .

Further, the action mechanism of the upright piano according to claim 3 of the present invention is the action mechanism according to claim 1 or 2, wherein a protrusion having a through hole is formed in the elastic member along the front and rear surfaces of the damper stop rail. By providing a long rubber cushion member that exerts an elastic force related to the resistance force and the original restoring force, the hammer shank and the damper wire at the time of string striking against the cushion member make the hammer A resistance is given to the movement of the shank and the damper wire, and an elastic force in the return direction of the hammer shank and the damper wire is urged .
The action mechanism of the upright piano according to claim 4 of the present invention is the rubber cushion member provided along the rear surface of the jack stop rail and the front and rear surfaces of the damper stop rail according to claim 1, 2 or 3. EPDM (ethylene propylene diene rubber) is used .

Claims (3)

A jack that pushes upwards in conjunction with the action of pushing down the keyboard, a hammer bat that pivots backward by the jack push-up action, a hammer shank supported by the hammer bat, and a tip of the hammer shank A hammer that strikes the strings, a damper stop rail that brakes the movement of the damper wire, a hammer bat skin provided on the push-up surface of the hammer bat, and a hammer bat spring for biasing the hammer forward after the string is struck An action mechanism of an upright piano having a jack spring that urges the jack in the reverse direction opposite to when the key is depressed, and a jack stop rail that regulates the range of movement of the jack while regulating the inclination of the jack after the key is depressed In
Strengthen the spring force of one hammer bat spring or use two hammer bat springs, and when using two hammer bat springs, twist the bat frenzy cord by providing a twisted portion. The hook part of the two hammer bat springs are hooked on the ring-shaped part and the twisted part at the tip of the hook part, and the material having excellent lubricity is used as the material of the hammer bat skin, while the elasticity of the jack spring , And the jack member immediately after escape from the bat skin hits the cushion member provided along the rear surface of the jack stop rail to elastically urge the return of the jack, and further to the front and rear surfaces of the damper stop rail. The hammer shank and damper wire when hitting the string hit the cushion member attached along the Resisting the movement of the hammer shank and damper wire and energizing the elastic force in the return direction of the hammer shank and damper wire, it was installed along the rear surface of the jack stop rail and the front and rear surfaces of the damper stop rail. Each of the cushion members is a long rubber-based cushion member that has a protruding portion provided with a through hole inside the elastic member so as to exert an elastic force related to a resistance force and an original restoring force. Upright piano action mechanism. As a material for hammer batskin with excellent lubricity, either apply iron to the batskin and apply graphite to process it into a material with excellent lubricity, or use synthetic leather with excellent lubricity. The action mechanism of the upright piano according to claim 1, wherein the action mechanism is an upright piano. 3. The upright piano according to claim 1, wherein EPDM (ethylene propylene diene rubber) is used as a rubber cushion member provided along the rear surface of the jack stop rail and the front and rear surfaces of the damper stop rail. Action mechanism.