JP2007155964A - Action of upright piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an action of an upright piano with which both excellent successive keying performance and touch feeling can easily be obtained by easily adjusting an energizing force of a butt spring without requiring skillfulness. <P>SOLUTION: The action 1 of the upright piano is characterized in that a butt 4 where a hammer 31 is stood is turnably supported by a butt flange 12, a jack 3 engages the butt 4 in a release state of a key, and according as the key 22 is pressed, the butt 4 is thrust up to turn the butt 4 and hammer 31 backward. Further, the butt spring 14 vertically extend so as to face the back of the butt 4, one of locked parts 14d to 14f at upper and lower end parts is locked to the butt 4 and butt flange 12 respectively, and the one of the locked parts 14d to 14f and another locked part flex in mutually different states when locked to energy the butt 4 forward with mutually different energizing forces. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an action of an upright piano that operates in response to pressing of a key and performs stringing by rotating a hammer.

  As an action of a conventional upright piano, for example, one disclosed in Patent Document 1 is known. This action is general and is attached to the bat, which is pivotally attached to the bat frenzy and has a hammer standing upright, a jack that engages the lower end of the bat when the key is released. Butt springs. This butt spring is a general one constituted by a torsion coil spring and extends in the vertical direction so as to face the back of the bat, and the upper end and the lower end are respectively locked to the bat and the butt flange. ing. With the above configuration, the bat spring is attached in a state of being bent between the bat and the bat frenzy, thereby constantly urging the bat in the return direction.

  In the action having such a configuration, when the key is depressed, the jack pushes up the bat, whereby the bat and the hammer rotate backward with the butt flang as a fulcrum while resisting the biasing force of the bat spring. . During this rotation, Jack leaves the bat. Further, after the jack is detached, the hammer is rotated as it is by inertia, and a piano sound is generated by striking a string stretched backward. Further, after this stringing, the hammer is rotated back together with the bat by the urging force of the bat spring, and the jack is engaged with the bat so that the hammer can be pushed up.

  In the action as described above, in order to ensure that the hammer strikes the string as soon as the same key is hit quickly as in the case of trilling, and to obtain good hitting performance, the hammer must be quickly It is preferable to set the urging force of the butt spring to be large so that it can be rotated back to the position and pushed up by the jack. Such a setting is also preferable in order to avoid the occurrence of a stick that does not return the hammer after stringing.

  On the other hand, as described above, the urging force of the bat spring acts so as to always urge the bat in the return direction, so that it always acts as a reaction force on the key when the key is depressed. For this reason, if the biasing force of the bat spring is too great, the static load of the key will increase, the touch weight will become excessive, and the “springy” touch feeling that can be obtained when the spring is deformed Will worsen the touch. As is apparent from the above, in order to achieve both good hitting performance and touch feeling, it is necessary to set the biasing force of the bat spring to an appropriate magnitude.

  Further, the above-described hitting performance and touch weight also change depending on the weight of the hammer, the rotation resistance of the bat, and the like. Further, in the action as described above, a predetermined butt spring urging force may not be obtained due to variations in the length of the bat frenzy cord due to mass production or individual differences of bat springs due to mass production. For this reason, it is necessary to adjust the urging force of the butt spring in order to obtain good continuous hitting and touch feeling.

  For example, it is conceivable to perform such adjustment by adjusting the bending state of the butt spring. However, in that case, the adjustment of the bending condition must be made according to the scale and intuition, so that skill is required, and even if it has skill, it is necessary to obtain an appropriate biasing force of the bat spring. It is necessary to repeat trials many times, and the adjustment work is very complicated.

  The present invention has been made to solve the above-described problems, and can easily adjust the biasing force of the bat spring without requiring skill, thereby providing both good hitting performance and touch feeling. An object is to provide an upright piano action that can be easily obtained.

Japanese Patent Laid-Open No. 6-27934

  In order to achieve the above object, an invention according to claim 1 is an action of an upright piano that operates in response to pressing of a key and performs stringing by rotating a hammer backward, Fence, bat that is pivotally supported by the bat frenzy, and a bat with a hammer standing upright, and when the key is released, the bat engages with the bat and pushes the bat as the key is pressed to In the middle of the rotation, the jack is detached from the bat, and extends in the vertical direction so as to face the back of the bat, and has a plurality of locked portions at the lower end, and the upper end and One of the plurality of locked portions is locked to the bat and the butt flange, respectively, and when one of the plurality of locked portions is locked to the butt flange, the other one is locked The In the case, by deflected at different deflection states from each other, characterized in that it comprises a butt spring biasing forwardly at different biasing force to each other butt.

  According to the action of this upright piano, when the key is released, the jack is engaged with the bat, and when the key is pressed from this state, the jack pushes up the bat so that the bat Along with the hammer erected on this, it pivots backward using the butt frenzy as a fulcrum. During this rotation, Jack disengages from the bat. Further, after the jack is detached, the hammer is rotated as it is by inertia and generates a piano sound by striking the string.

  Further, a bat spring extends vertically on the back surface of the bat so as to face the bat, and its upper end is locked to the bat, and one of a plurality of locked portions provided at the lower end is the bat. Locked against the frenzy. As a result, the bat spring is provided in a state of being bent between the bat and the butt frenzy, thereby urging the bat forward. It turns back toward the position.

  In addition, the butt spring is bent with respect to the butt flange in a state where one of the plurality of locked portions of the bat spring is locked and when the other one is locked in different bending states. The bats are biased with different biasing forces. Therefore, the urging force of the butt spring can be adjusted by changing the locked portion that is locked to the butt flange. In this way, adjustment of the urging force of the bat spring can be performed simply by selecting one locked portion from a plurality of locked portions. Therefore, it is possible to easily obtain both good hitting performance and touch feeling.

  Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows action 1 of the upright piano according to the present embodiment, in which the keyboard 21 and the hammer 31 are in a key release state. In the following description, the front side as viewed from the performer side is described as “front”, and the back side is described as “rear”. Moreover, hatching is abbreviate | omitted in the figure for demonstrating embodiment containing the figure for convenience. The keyboard 21 is composed of a number of keys 22 (only one is shown) arranged in the left-right direction (the depth direction in FIG. 1). Each key 22 is rotatably supported by a balance pin 23 a erected on the collar 23.

  A hammer 31 is provided for each key 22 (only one is shown), and each hammer 31 has a hammer shank 32 and a hammer head 33. The hammer shank 32 is formed in an elongated bar shape having a circular cross section, is erected on the upper surface of a bat 4 described later of the action 1, and extends in the vertical direction. The hammer head 33 is composed of a hammer wood 33a and a hammer felt 33b wound around the hammer wood 33a. The hammer head 33 is provided at the upper end portion of the hammer shank 32. Opposite to.

  The action 1 is attached to brackets (not shown) provided on the left and right ends of the flange 23 above the rear end of the keyboard 21, and is disposed between the left and right brackets. The action 1 has a whippen 2, a jack 3 and a bat 4 provided for each key 22 (only one is shown). A center rail 41 and a hammer rail 42 are passed between the left and right brackets.

  The wippen 2 is formed in a predetermined shape by, for example, synthetic resin or wood, and rotates at a rear end portion thereof to a wippen frenzy 5 fixed to the lower end portion of the center rail 41 via a pin-shaped fulcrum 2a. It is supported freely. A heel portion 2b protruding downward is provided at the front portion of the wippen 2, and the wippen 2 is connected to the capstan button 22a provided at the rear end portion of the upper surface of the corresponding key 22 via the heel portion 2b. It is mounted on. A back check wire 6a is erected on the front end portion of the upper surface of the whippen 2, and the back check 6 is attached to a tip portion of the back check wire 6a. Further, a spoon 7 for driving a damper 45 to be described later is erected on a portion of the upper surface of the whippen 2 behind the whippen flange 5.

  The jack 3 is made of, for example, a synthetic resin and is integrally formed by injection molding. The jack 3 has a base portion 3a extending in the front-rear direction and a protruding top portion 3b extending upward from the rear end portion of the base portion 3a. At the corner portion of the base portion 3a and the protruding top portion 3b, It is rotatably supported via a pin-shaped fulcrum 3c. Between the base 3a of the jack 3 and the whippen 2, a jack spring 8 is provided for returning and turning the jack 3 when the key is released. Further, a regulating button 9 is provided for each key 22 above the base 3a (only one is shown). The regulating button 9 is fixed to the center rail 41 via the regulating bracket 10 and the regulating rail 11.

  The bat 4 is formed of a synthetic resin into a predetermined shape, and rotates at a lower end portion on the back surface 4b side to a butt flange 12 fixed to the upper end portion of the center rail 41 via a pin-shaped fulcrum 4a. It is supported freely, so that the hammer 31 is rotatable. A catcher 13 is attached to the front surface of the bat 4. The catcher 13 extends forward, and is positioned behind the back check 6 described above in a key-released state, and is opposed thereto. Further, the upper end portion of the back surface 4b of the bat 4 slightly protrudes rearward, and a groove 4c is formed at the center in the left-right direction. A butt spring 14 is attached to the groove 4c (see FIG. 3). .

  As shown in FIG. 2, the butt spring 14 is formed of a torsion coil spring, and has a coil portion 14a, a first arm portion 14b, and a second arm portion 14c. The coil portion 14a is locked to the butt spring cord 15 in a state of being accommodated in the groove 4c of the bat 4, and the first arm portion 14b extends downward from one end of the coil portion 14a and is formed on the bottom surface of the groove 4c. Is engaged. The second arm portion 14c extends downward from the other end of the coil portion 14a so as to face the back surface 4b of the bat 4, and the lower end portion thereof, in order from the upper side, first to third hook portions 14d, 14e and 14f (locked portions) are formed.

  Each of the first to third hook portions 14d to 14f protrudes in a state of being convexly curved toward the bat 4, and the protruding amounts thereof are set to respective predetermined sizes. Then, the protrusion amount of the 1st hook part 14d is the largest. Any one of the first to third hook portions 14d to 14f is selectively hooked and locked to the butt flange cord 16 attached to the butt flange 12. 1 to 3 show a state in which the first hook portion 14d is locked to the butt flange cord 16 (hereinafter, this locked state is referred to as a “first locked state”). With the above configuration, the bat spring 14 is attached in a state of being bent between the bat 4 and the butt flange 12, thereby constantly biasing the bat 4 forward and causing the hammer 31 to rotate clockwise in FIG. 1. Energized.

  In addition, the angle θ between the tangent line at the predetermined position A of the second arm portion 14c and the back surface 4b of the bat 4 in the key release state (hereinafter referred to as “deflection angle”), as shown in FIG. In the stop state, the first predetermined angle θ1 is set. Further, as shown in FIGS. 4 and 5, when the second and third hook portions 14e and 14f are locked to the butt flange cord 16 (hereinafter, these locked states are referred to as “second locked state”, respectively). In the “third locking state”), the deflection angle θ is the second and third predetermined angles θ2 and θ3, respectively. These first to third predetermined angles θ1 to θ3 have a magnitude relationship of θ1> θ2> θ3.

  That is, the deflection of the butt spring 14 is minimum in the first locking state and maximum in the third locking state, and accordingly, the biasing force of the butt spring 14 is minimum and third locking in the first locking state. Maximum when stopped. Therefore, the urging force of the butt spring 14 can be adjusted by changing the first to third hook portions 14 d to 14 f that are locked to the butt flange cord 16.

  When θ1−θ2 = α and θ2−θ3 = β, the manner of adjusting the urging force of the butt spring 14 can be variously changed according to the predetermined values α and β. For example, the biasing force of the butt spring 14 can be finely adjusted by setting the predetermined values α and β to be small and reducing the difference between the first to third predetermined angles θ1 to θ3. Alternatively, the urging force of the butt spring 14 can be adjusted with a larger adjustment range by setting the predetermined values α and β to larger values.

  With the above configuration, in the key-released state, the protruding portion 3b of the jack 3 is engaged with the protruding upper portion 4d formed by the front end portion of the lower surface of the bat 4 from below, so that the hammer 31 is stationary. Yes.

  Behind the action 1, a damper 45 is provided for each key 22 (only one is shown). The damper 45 includes a damper lever 45b rotatably attached to the center rail 41 via a damper flange 45a, a damper head 45d attached via a damper wire 45c on the upper side of the damper lever 45b, and a damper head 45d. The damper lever spring 45e is urged toward the string S side. The damper 45 performs a sound stopping operation when the damper head 45d presses the string S by the urging force of the damper lever spring 45e when the key is released.

  Next, a series of operations from the start of key pressing to the end of key release, such as action 1 described above, will be described. When the performer depresses the key 22 in the released state, the key 22 rotates around the balance pin 23a in the clockwise direction in FIG. 1, and the whippen 2 placed at the rear end thereof is the key 22 Is turned upward (counterclockwise) around the fulcrum 2a. As the whippen 2 rotates, the jack 3 moves upward together with the whippen 2 and pushes up the bat 4 through the projecting upper part 3b. As a result, the bat 4 and the hammer 31 rotate counterclockwise around the fulcrum 4a toward the rear string S while resisting the biasing force of the bat spring 14.

  When the whippen 2 rotates by a predetermined angle, the base 3a of the jack 3 comes into contact with the regulating button 9, and the upward movement is restricted, so that the jack 3 is rotated clockwise with respect to the whippen 2. Rotate.

  When the key depression is further advanced, the jack 3 is further rotated with respect to the wippen 2, so that the protruding portion 3b is detached forward from the bat 4 and the jack 3 is detached from the hammer 31 (letoff). As a result, the weight of the bat 4 and the hammer 31 is lost from the touch weight of the key 22, thereby giving the player a let-off feeling.

  Further, after the jack 3 is detached, the hammer 31 is rotated by inertia, and the string S is struck to generate a piano sound. Thereafter, the hammer 31 is returned and rotated clockwise by the urging force of the butt spring 14, and is temporarily stopped when the catcher 13 is locked to the back check 6.

  Then, as the key depression is completed and the key 22 is released, the locked state of the hammer 31 by the back check 6 is released, whereby the hammer 31 resumes the return rotation. In parallel with this, the key 22 and action 1 also return and rotate to return to the key release state shown in FIG. 1, and a series of operations from the start of key pressing to the end of key release ends. .

  As described above, according to the present embodiment, the urging force of the butt spring 14 can be adjusted by changing the first to third hook portions 14d to 14f that are locked to the butt flange cord 16. Unlike the case of adjusting the bending state of the butt spring, it can be easily performed without requiring skill. Therefore, it is possible to easily obtain both good hitting performance and touch feeling.

  In addition, the butt spring 14 can be configured by simply forming the first to third hook portions 14d to 14f integrally with a part of a normal bat spring by bending or the like, and adjusts the urging force of the bat spring 14. Therefore, it is not necessary to newly add a special separate part, so that the action 1 is not increased in size and the manufacturing cost is not increased.

  Furthermore, in general, for rich musical expression, it is important to accurately grasp the so-called let-off timing when the jack 3 is detached from the hammer 31 and to finely control the stringing speed of the hammer 31 accordingly. is there. In order to clarify the timing of let-off, it is preferable to set a larger difference in touch weight before and after let-off (let-off load). As described above, the urging force of the butt spring 14 urges the bat 4 in the return direction, and thus acts as a reaction force on the key 22 until the jack 3 is released at the time of key depression. Affects. Therefore, adjustment of the urging force of the butt spring 14 may be used for adjustment of the let-off load. Further, the adjustment of the urging force of the butt spring 14 may be performed so as to avoid the occurrence of a stick that causes the hammer 31 to not return after striking.

  FIG. 9 shows a result obtained by experiment to determine the relationship between the pressing amount of the key 22 (hereinafter referred to as “key pressing amount”) and the touch weight when the action 1 of the present embodiment described above is used. The solid line and the two-dot chain line show the relationship between the key press amount and the touch weight in the above-described first locking state and third locking state, respectively. Further, point A in FIG. 9 indicates the start timing of the key depression, point B indicates the timing at which the jack 3 contacts the regulating button 9, and point C indicates the timing at which the jack 3 comes off the hammer 31. These show the timing when the front end of the key 22 comes into contact with the front rail (not shown) of the flange 23 after the jack 3 is detached from the hammer 31.

  As shown in the figure, in the third locking state, the touch weight is large as a whole compared to the first locking state. In particular, the let-off load LL3 in the third locking state is the first locking state. It is about 3 times the let-off load LL1 in the state. As described above, it was confirmed that the touch weight and the let-off load can be adjusted by changing the first to third hook portions 14d to 14f to be locked to the butt frenzy cord 16.

  Next, a modified example of the butt spring 14 will be described with reference to FIGS. In this modification, the lower end portion of the second arm portion 14c of the bat spring 14 is wound three times in a spiral shape, and the first to third winding portions 14g, 14h, and 14i (engaged from the outside) in order from the outside. Stop). One of the first to third winding portions 14g to 14i is adapted to be locked to the butt frenzy cord 16, specifically, the first to third winding portions 14g to 14g. The portions of 14 i that are closest to the butt frenzy 12 are locked to the butt frenzy cord 16.

  With this configuration, as shown in FIGS. 6 to 8, when the first winding portion 14 g is locked to the butt flange cord 16, the deflection angle θ of the butt spring 14 is set to the maximum first predetermined angle θ 1. When the winding portion 14h is locked, the second predetermined angle θ2 is set, and when the third winding portion 14i is locked, the minimum third predetermined angle θ3 is set. Therefore, the biasing force of the butt spring 14 can be adjusted by changing the first to third winding portions 14g to 14i that are locked to the butt flange cord 16, so that the effect of the first embodiment described above can be obtained similarly. be able to.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the present embodiment, the butt spring 14 is constituted by a torsion coil spring, but the upper end and the lower end thereof are respectively locked to the bat 4 and the butt flange 12 and urge the bat 4 forward. Any other suitable spring, such as a leaf spring, may be used. In the present embodiment, the number of the latched portions of the butt spring 14 is 3, but the number is arbitrary as long as it is plural, and the greater the number, the more the urging force of the bat spring 14 is increased. It can be adjusted in stages. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a sectional side view which shows the action and hammer by this embodiment in a key release state. FIG. 2 is an enlarged side view of the bat of FIG. FIG. 2 is an enlarged rear view of the bat of FIG. FIG. 3 is an enlarged side view similar to FIG. 2 when the butt spring is in a different locking state from FIG. 2. FIG. 5 is an enlarged side view similar to FIG. 2 when the butt spring is in a different locking state from FIGS. 2 and 4. It is an enlarged side view similar to FIG. 2 showing a butt spring and the like according to a modification. FIG. 7 is an enlarged side view similar to FIG. 6 when the butt spring is in a different locking state from FIG. 6. FIG. 8 is an enlarged side view similar to FIG. 6 when the butt spring is in a different locking state from FIGS. 6 and 7. It is a figure which shows the relationship between the key depression amount when using the action of FIG. 1, and a touch weight when a bat spring exists in two different latching states.

Explanation of symbols

1 Action 3 Jack 4 Butt 12 Butt Flanging 14 Butt Spring 14a Coil (upper end)
14d 1st hook part (locked part)
14e Second hook part (locked part)
14f 3rd hook part (locked part)
14g Volume 1 (locked part)
14h Volume 2 (locked part)
14i Volume 3 (locked part)
22 keys 31 hammer S string

Claims (1)

It is an action of an upright piano that operates in response to pressing of the key, and performs stringing by turning the hammer backward,
Bat frenzy,
A bat that is rotatably supported by the butt frenzy and has the hammer standing thereon;
The key is engaged with the bat when the key is released, and the bat and the hammer are rotated rearward by pushing up the bat as the key is pressed. With Jack leaving,
It extends in the vertical direction so as to face the back of the bat, has a plurality of locked portions at the lower end, and one of the upper end and the plurality of locked portions is against the bat and the butt flange. When one of the plurality of locked portions is locked with respect to the butt flange, and when the other one is locked with respect to the butt flange, by bending in different bending states, A butt spring that urges the bat forward with different urging forces;
Upright piano action characterized by comprising.

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