JP2006171575A - Actions of upright piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide actions of an upright piano that can stabilize the back-stop position of a hammer with simple constitution, regardless of the key hitting strength, and without changing the sensation of touch on a key. <P>SOLUTION: Disclosed is the action 1 of an upright piano which operates as a key is depressed to make a hammer 3 turn to hit the wires, the action 1 equipped with a wippen 6, which is knocked up by the key 4 when the key is depressed to turn; a jack 7 which knocks up the hammer 3 as the key is depressed to turn it, a regulating button 13 which make the jack 7 turn, with respect to the wippen 6 during the turning of the hammer 3 to make the jack 7 leave a pad 20, and a back check 9, which has a locking surface 19b facing a catcher 23 in a key removed state and a stopper portion 19c protruding toward the catcher 23 and locks the hammer 3 in return rotation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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.

  In a grand piano, a hammer that returns and rotates after stringing is locked at a predetermined position by a back check attached to the rear end of the key, thereby preventing rebound of the hammer (hereinafter referred to as “backstop”). "). Immediately before the hammer is locked to the back check, the hammer head that returns and rotates, and the back check that rotates when the key is pressed, move in opposite directions toward the opponent, and the timing is shifted. The hammer is securely locked in place.

  On the other hand, in a normal upright piano, a catcher is provided at the tip of the catcher shank extending forward from the bat of the hammer, and a back check is provided at the upper end of the back check wire erected at the front end of the wippen. Immediately before the catcher is locked to the back check, the catcher moves downward and the back check moves substantially horizontally. Then, the side of the catcher comes into contact with the back check, and the back check is pressed to be engaged with the back check, whereby the return rotation of the hammer is stopped. For this reason, for example, when the key is struck, that is, when the kinetic energy given to the hammer is large and the hammer rotates at a high speed, the timing at which the two engage easily deviates. Also, since the kinetic energy of the hammer is large, the hammer cannot be stopped at the engaged position, and the catcher moves so as to slide on the back check even after the engagement, and the rotation of the hammer does not stop immediately. There is. For this reason, for example, the behavior of the hammer at the time of continuous hitting becomes unstable, for example, the position of the backstop changes depending on the strength of the key depression.

  As an action of a conventional upright piano for solving such a problem, for example, one disclosed in Patent Document 1 is known. In this action whippen, the front end portion is curved upward, and the obliquely inclined portion of the upper end portion of the curved portion is configured as a back check. Also, the bat of the hammer is provided with a catcher shank that protrudes forward and extends long toward the lower back check. The tip of the catcher shank faces obliquely downward so as to face the back check. A catcher is installed.

  According to such an action, the hammer hits the string as the key is pressed, and the catcher engages with the back check and is locked to the back check while the return rotation is in progress. The top is done. Immediately before the catcher engages with the back check, due to the above-described configuration, the positional relationship between the two moves in the opposite directions as in the case of the grand piano, so the hammer is locked in place. Is done.

  However, the conventional actions described above have the following problems. That is, as described above, since the catcher shank is long and the catcher is arranged at a position far from the center of rotation of the hammer, the moment of inertia when the hammer rotates is increased. For this reason, in order to generate a sound of the same magnitude as in the case of a normal action, it is necessary to press the key with a greater force, which may increase the touch feeling of the key and give the player a sense of discomfort. There is.

  The present invention has been made to solve the above-described problems, and has a simple configuration, regardless of the key pressing strength, and without changing the touch feeling of the key, the back stop position of the hammer. The purpose is to provide an upright piano action that can stabilize.

Japanese Utility Model Publication No. 54-14525 (1st page, Fig. 2 and 3)

  In order to achieve this object, the invention according to claim 1 of the present invention is an upright piano that operates in response to pressing of a key and performs stringing by rotating a hammer having an integrated catcher. Action, a whippen that rotates upward when pushed by the key when the key is pressed, and a jack that is pivotally attached to the whippen and that is rotated by pushing the hammer when the key is pressed When the hammer is rotated by pressing the key, the jack is engaged with the jack, and the jack is rotated with respect to the wippen, so that the jack is detached from the hammer. When the key is released, the locking surface facing the catcher is provided below the locking surface and protrudes toward the catcher. And a stopper portion, a hammer that swings back after striking the string, by engaging through the catcher, characterized in that it and a back check to prevent rebounding of the hammer.

  According to the action of the upright piano, when the key in the released state is pressed, the whippen is rotated upward by being pushed up by the key. At that time, the jack and back check provided on the wippen move upward together with the wippen, and the jack is rotated by pushing up the hammer. During the rotation of the hammer, the jack is engaged with the regulating button and is released from the hammer by rotating with respect to the whippen, after which the hammer continues to rotate due to inertia and hits the string. By doing so, a performance sound is generated.

  The hammer that hits the string returns and rotates in the direction opposite to that when the key is pressed by the repulsive force of the string, and the catcher of the hammer is locked to the back check in the middle. Thereby, the hammer temporarily stops the return rotation. The back check is provided with a locking surface that faces the catcher in the key-released state and a stopper that continues to the lower side and protrudes toward the catcher side. At the same time, it comes into contact with the locking surface of the rotating back check, and the side portion of the catcher is locked by being pressed by the locking surface. Further, the catcher comes into contact with the upper portion of the stopper portion, so that the catcher is reliably locked to the back check, and the return rotation of the hammer is surely stopped. In this way, the hammer is backstopped, thereby preventing the hammer from rebounding.

  As described above, the hammer that returns and rotates after striking finally stops at the position where the catcher comes into contact with the stopper portion of the back check when the catcher comes into contact with the stopper portion of the back check. Therefore, the hammer can be locked at a fixed position regardless of the strength of the key depression, and the back stop position of the hammer can be stabilized. Further, unlike the conventional action described above, the positional relationship between the components of the action is the same as that of the normal action, so that almost the same touch feeling as in the case of the normal action can be obtained.

  According to a second aspect of the present invention, in the action of the upright piano according to the first aspect, the catcher has a locked surface that is locked to the back check, and the locked surface is engaged with the locking surface. It is formed so as to come into surface contact with the locking surface in a stopped state.

  According to the action of this upright piano, the catcher is locked in a state in which the locked surface is in surface contact with the locking surface of the back check. Thereby, the pressing force from the back check is reliably transmitted to the catcher, so that the back stop position of the catcher, that is, the hammer can be further stabilized.

  The invention according to claim 3 is the action of the upright piano according to claim 2, wherein the locked surface is centered on the axis of rotation of the hammer, and the distance between the center and the locked surface is a radius. It extends in the tangential direction of the arc.

  According to the action of this upright piano, the locked surface of the catcher is an arc whose radius is the distance between the rotation center of the hammer and the locked surface, that is, when the hammer rotates. The catcher extends in the tangential direction of the track of the catcher, and such a locked surface comes into surface contact with the locking surface of the back check, whereby the catcher is locked to the back check. As a result, the positional relationship between the two before and after the catcher is locked to the back check is close to the positional relationship between the two when the grand piano hammer is locked to the back check. Can be made more stable.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show the action 1, the keyboard 2, the hammer 3 and the like of the upright piano according to the present invention in a key-released state. In the following description, the front side of the upright piano when viewed from the performer side is described as “front”, and the back side is described as “rear”. The keyboard 2 is composed of a large number of keys 4 (only one is shown) arranged in the left-right direction (the depth direction in FIG. 1). , Is supported by the flange 5 so as to be swingable.

  The action 1 is attached to brackets (not shown) provided on the left and right ends of the keyboard 5 above the rear end of the keyboard 2, and is provided between the brackets. The action 1 has a whippen 6, a jack 7, and the like, which are provided for each key 4 (only one is shown). A center rail 16 and a hammer rail 17 are passed between the left and right brackets. The rear end of the wippen 6 is connected to the wippen frenzy 12 and the butt frenzy 24 screwed to the center rail 16 for each key 4. And the lower end of the hammer 3 are respectively attached to be rotatable.

  The wippen 6 is formed in a predetermined shape by, for example, synthetic resin or wood, and has a heel portion 6a that protrudes downward from the front portion thereof, and a cap provided at the rear end portion of the upper surface of the corresponding key 4. The stan button 4a is placed via a heel portion 6a. Further, a back check wire 9 a is erected on the front end portion of the upper surface of the wippen 6, and the back check 9 is attached to the tip end portion thereof. In addition, a spoon 11 for driving a damper 25 described later is erected on the rear end portion of the upper surface of the wippen 6. Further, the aforementioned Wippen Frenzy 12 is disposed immediately in front of the spoon 11, and the upper part of the Wippen Frenzy 12 is fixed to the center rail 16.

  The back check wire 9a extends obliquely forward from the wippen 6, and its upper end is bent so as to extend substantially vertically in the key release state. Further, the back check 9 has a base portion 18 fixed to the back check wire 9 a and a locking portion 19 attached to the back surface of the base portion 18. The locking portion 19 is formed in a block shape, and, for example, a felt 19a is attached so as to cover the entire rear surface from the upper end of the rear surface to the lower end of the front surface. The upper part of the rear surface of the locking portion 19 is a locking surface 19b. The locking surface 19b extends substantially vertically in the key release state, and faces a catcher 23 described later. Further, a portion of the locking portion 19 that continues to the lower side of the locking surface 19b is a stopper portion 19c, and the rear surface of the stopper portion 19c is slightly from the lower end of the locking surface 19b toward the catcher 23 side. It is formed in a gently curved predetermined curved shape that protrudes.

  The jack 7 is made of a synthetic resin, such as polyacetal resin, and is integrally formed by injection molding. As shown in FIG. 2, the jack 7 has a base portion 7a extending in the front-rear direction and a hammer push-up portion 7b extending upward from the rear end portion of the base portion 7a. Further, the jack 7 is formed with a recess 7e for weight reduction.

  The jack 7 as described above is rotatably attached at a position behind the back check wire 9a of the wippen 6 at the corner between the base portion 7a and the hammer push-up portion 7b. A jack spring 10 is attached between the base portion 7 a and the wippen 6. The jack spring 10 is composed of a coil spring, and is used to bias the jack 7 as described later when the key is depressed, and has a predetermined spring force.

  Above the base portion 7a of the jack 7, a regulating button 13 is provided. The regulating button 13 is provided for each key 4 via a plurality of regulating brackets 14 provided on the center rail 16 and a regulating rail 15 attached to the front end portion and extending in the left-right direction ( Only one is shown).

  The hammer 3 has a bat 20, a hammer shank 21, a hammer head 22, and the like. The bat 20 is attached at its lower end to the above-described butt flange 24 so as to be rotatable about the axis A, whereby the hammer 3 is rotatable. The butt flange 24 is fixed to the center rail 16 at the lower end thereof. The hammer shank 21 is erected on the upper surface of the bat 20, and the hammer head 22 is attached to the upper end of the hammer shank 21. In the key release state shown in FIG. 1, the hammer shank 21 abuts against the hammer rail 17 from the rear. The hammer head 22 is opposed to the rear string S which is stretched vertically. Further, a catcher shank 26 that is formed in a rod shape and extends toward the back check 9 is provided on the front surface of the bat 20, and a catcher 23 is attached to a front end portion thereof.

  The catcher 23 has a substantially triangular cross-sectional shape, and its rear surface is substantially perpendicular to the catcher shank 26, whereas the front surface is a locked surface 23 a that extends obliquely with respect to the catcher shank 26. . Specifically, the locked surface 23a has a track of the locked surface 23a when the hammer 3 rotates, that is, the axis A and the distance between the axis A and the locked surface 23a. It extends in the tangential direction of the arc as the radius. Further, the locked surface 23a extends substantially vertically as shown in FIG. 2 in the key release state.

  Such a catcher 23 is located behind the above-described back check 9 and faces the back check 9. Further, a butt spring 20a is provided between the bat 20 and the hammer shank 21, whereby the hammer 3 is urged clockwise in FIG. Further, in this key release state, the above-described hammer push-up portion 7b of the jack 7 is engaged with the push-up portion 20b formed by the front end portion of the lower surface of the bat 20 from below.

  Further, behind the action 1, a damper 25 is provided for each key 4 (only one is shown). The damper 25 includes a damper lever 25c rotatably attached to the center rail 16 via a damper flange 25b, a damper head 25a attached to the upper side of the damper lever 25c via a damper wire 25d, and the damper 25 as a string. The damper lever spring 25e is biased toward the S side. The damper 25 is for stopping sound when the damper head 25a comes into contact with the string S by the urging force of the damper lever spring 25e when the key is released.

  Hereinafter, a series of operations from the start to the end of the key pressing of the action 1 and the hammer 3 will be described. When the performer depresses the key 4 from the key release state of FIG. 1, the key 4 rotates in the clockwise direction of FIG. 1, and the whippen 6 placed at the rear end is pushed up by the key 4. As a result, it rotates upward (counterclockwise). As the whippen 6 is rotated, the jack 7 and the back check 9 provided on the wippen 6 are rotated together, and the hammer 3 is pushed by the hammer push-up portion 7b of the jack 7 by pushing the bat 20 up. , Turn counterclockwise toward the rear string S.

  When the wippen 6 rotates by a predetermined angle, the front end portion of the base portion 7a of the jack 7 contacts the regulating button 13 from below. As the wippen 6 further rotates, the jack 7 is rotated clockwise with respect to the wippen 6 by the upward rotation being restricted by the regulating button 13.

  When the key is further pushed and the jack 7 is further rotated in the clockwise direction in contact with the regulating button 13, the hammer push-up portion 7 b is detached from the bat 20 and detached from the hammer 3. As a result, the weight of the hammer 3 is abruptly lost from the touch weight of the key 4, thereby giving the player a let-off feeling. The hammer 3 is rotated by inertia even after the jack 7 is detached, and generates a performance sound by vibrating the string S by striking the string S. Then, the hammer 3 starts returning to the clockwise direction by the repulsive force of the string S.

  The hammer 3 is locked by the back check 9 through the catcher 23 in the middle of the return rotation as described below, whereby the hammer 3 is back-stopped. First, at this time, the back check 9 is moved upward together with the wippen 6 as the key is depressed. Further, the catcher 23 approaches the back check 9 from above as the hammer 3 returns and rotates. At this time, the locking surface 19b of the back check 9 and the locked surface 23a of the catcher 23 are substantially parallel to each other. Immediately thereafter, the lower end of the catcher 23 continues from the locking surface 19b of the back check 9. The return rotation of the hammer 3 is stopped by contacting the stopper portion 19c. At the same time, the locked surface 23a of the catcher 23 abuts on the locking surface 19b, so that the catcher 23 and the back check 9 come into surface contact with each other and are pressed by the locking surface 19b, thereby the back check 9 However, it is reliably latched in the position contact | abutted to the stopper part 19c.

  When the hammer 3 is backstopped as described above, the hammer 3 is locked at the backstop position shown in FIG. 3 and its return rotation is temporarily stopped to prevent the hammer 3 from rebounding. Is done. Further, the upper end portion of the hammer push-up portion 7b at this time is detached from the push-up portion 20b of the bat 20 and is adjacent to the front side thereof.

  When the key depression is completed and the key 4 is released, the key 4 and the whippen 6 rotate in directions opposite to those when the key is depressed. At this time, since the back check 9 also moves together with the wippen 6, the hammer 9 is released from being locked by the back check 9 by starting to move away from the catcher 23, contrary to the time of the key depression. Thereby, the hammer 3 resumes the return rotation in the clockwise direction by the urging force of the butt spring 20a.

  On the other hand, when the key is released, the jack 7 moves substantially downward together with the wippen 6 and, by the urging force of the jack spring 10, rotates reversely in the counterclockwise direction with respect to the wippen 9 as opposed to when the key is pressed. As a result, the following operations are performed. That is, as the jack 7 moves downward, the hammer push-up portion 7 b enters the lower side of the bat 20. Thereby, the upper end portion of the hammer push-up portion 7b comes into engagement with the pushed-up portion 20b of the bat 20 from below, and the hammer 3 can be pushed up again. When the return rotation of the key 4 and the like further proceeds, the hammer shank 21 comes into contact with the hammer rail 17 to stop the return rotation, and the whippen 6, jack 7 and back check 9 are completely At this time, the key release state is restored, and a series of operations at the time of key depression and key release ends.

  As described above, the hammer 3 that returns and rotates after stringing stops when the catcher 23 comes into contact with the stopper portion 19c of the back check 9 and stops at the position in contact with the stopper portion 19c. Therefore, the hammer 3 can be locked at a fixed position regardless of the strength of the key depression, and the back stop position of the hammer 3 can be stabilized. Further, unlike the above-described conventional action, the positional relationship between the components of action 1 is the same as that of the normal action, so that almost the same touch feeling as in the case of the normal action can be obtained.

  Further, the catcher 23 is locked in a state where the locked surface 23 a is in surface contact with the locking surface 19 b of the back check 9. Thereby, the pressing force from the back check 9 is reliably transmitted to the catcher 23, so that the back stop position of the catcher 23, that is, the hammer 3, can be further stabilized.

  Further, the locked surface 23a of the catcher 23 extends in the contact direction of the track of the catcher 23 when the hammer 3 rotates. Such a locked surface 23a is the locking surface 19b of the back check 9. When in surface contact with each other, the two parts 23a and 19b extend substantially parallel to each other. As a result, the positional relationship between the two before and after the catcher 23 is locked to the back check 9 becomes close to that of the grand piano hammer and back check, so that the back stop position of the hammer 3 is further increased. It can be stabilized.

  In addition, this invention can be implemented in a various aspect, without being limited to each described embodiment and modification. In addition, the material of each component such as the wippen and the jack shown in the embodiment is merely an example, and other appropriate materials can be adopted. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a side view which shows the action by 1st Embodiment of this invention in a key release state. FIG. 2 is a partially enlarged view showing a jack of the action of FIG. 1 and its vicinity in a key release state. It is the elements on larger scale which show the jack of the action of FIG. 1, and its vicinity at the time of key pressing.

Explanation of symbols

1 Action 2 Keyboard 3 Hammer 4 Key 6 Wippen 7 Jack 9 Back Check 13 Regulating Button 19b Locking Surface 19c Stopper 23 Catcher 23a Locked Surface

Claims (3)

It is an action of an upright piano that operates in response to pressing of a key and makes a string hit by rotating a hammer that integrally has a catcher,
A whippen that pivots upward by being pushed up by the key when the key is depressed;
A jack that is pivotally attached to the whippen, and is rotated by pushing up the hammer as the key is depressed,
A regulating button that engages the jack and rotates the jack with respect to the whippen to release the jack from the hammer during the rotation of the hammer accompanying the pressing of the key;
A locking surface that is attached to the whippen and that faces the catcher when the key is released, and a stopper portion that is provided continuously below the locking surface and protrudes toward the catcher; A back check that locks the hammer that returns and rotates after hitting the string via the catcher;
Upright piano action characterized by having.   The catcher has a locked surface that is locked to the back check, and the locked surface is formed to come into surface contact with the locking surface while being locked to the locking surface. The action of the upright piano according to claim 1, wherein the action is performed. The locked surface is centered on an axis of rotation of the hammer, and extends in a tangential direction of an arc whose radius is a distance between the center and the locked surface. Action of the upright piano as described in 2.

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