JP5020522B2 - Upright piano jack stationary - Google Patents

Description

  The present invention relates to a jack stationary device for an upright piano that causes a jack that pushes and rotates a hammer in accordance with a key depression to rest at a predetermined stationary position in a key release state.

  As disclosed in Patent Document 1, in a conventional upright piano, a hammer assembly composed of a bat, a hammer, or the like is rotatably provided. A bat felt is provided at the lower end portion of the front surface of the bat, and this bat felt is usually formed of a wool felt having flexibility and is formed in a block shape. In the key release state, the rotatable jack is engaged with and supports the bat from below, and the corner portion of the upper end of the jack is in contact with the front surface of the bat felt in an inclined state. The hammer assembly is biased toward the key release position by a butt spring. For this reason, the hammer assembly is stationary in a state where the weight and the spring force of the bat spring are balanced with the support force of the jack, and the stationary position of the jack at this time is defined by the thickness of the butt felt.

  When the key is depressed, the whippen is pushed up by the key, and the jack moves up with the whippen to push up the hammer assembly. In the middle, the base of the jack abuts on the regulating button, so that the jack rotates with respect to the wippen, the jack's hammer push-up part moves away from the bat (letoff), and immediately after that, the hammer string A piano sound is generated by hitting the string.

  When the key is released, the jack is rotated in the opposite direction to the key pressing time by the jack spring as it moves downward together with the wippen. Then, the hammer thrust-up portion strongly contacts the bat felt of the bat that has returned and rotated, thereby restricting the rotation of the jack. The impact when the jack abuts is mitigated by the bat felt.

  However, in the above-mentioned upright piano, the jack that returns and rotates when the key is released makes a strong contact with the butt felt in a tilted state, and the load from the jack concentrates and acts on this contact portion. By repeatedly performing the contact, the elasticity of the bat felt is gradually lost, and it cannot be restored in a compressed and deformed state. In addition, as described above, since the quiescent position of the jack is defined by the bat felt, if the thickness is reduced by compression deformation, the quiescent position of the jack is shifted to the back side with respect to the appropriate position accordingly. End up. As a result, the touch feeling of the key may change, or the let-off timing may change, thereby adversely affecting the repeatability. As a result, touch control may be hindered. In addition, as described above, the stationary position of the hammer assembly is affected by the spring force of the bat spring, so that the stationary position of the hammer assembly has changed due to, for example, variations in the spring force of the bat spring or changes over time. In this case, the stationary position of the jack is also shifted from the appropriate position accordingly.

  The present invention has been made to solve the above-described problems, and by keeping the jack stationary position at an appropriate position, it is possible to ensure proper operation of the jack and the hammer, whereby the touch feeling of the key is achieved. An object of the present invention is to provide an upright piano jack stationary device that can maintain good hitting performance.

JP-A-5-323953

  In order to achieve the above object, an invention according to claim 1 of the present invention provides an upright piano that causes a jack that pushes and rotates a hammer in accordance with a key depression to stop at a predetermined stationary position in a key release state. A jack stationary device, comprising: a stationary member that does not move; and a stopper that is provided on the stationary member and that is fixed to a predetermined stationary position by locking a jack that returns and rotates when the key is released. It is characterized by that.

  According to this upright piano jack stationary device, the jack is locked to the stopper provided on the stationary stationary member when returning and rotating with the release of the key, so that the jack is stationary at a predetermined stationary position. To do. In this way, the jack is stopped by the stopper provided on the stationary stationary member, so that the jack can be accurately positioned at a predetermined stationary position as compared with the conventional case where the jack is stopped by the bat felt of the rotatable bat. Can be stationary. As a result, the stationary position of the jack is maintained at an appropriate position, so that the proper operation of the jack and the hammer can be ensured, whereby the touch feeling of the key, the repeatability, etc. can be favorably maintained.

  According to a second aspect of the present invention, in the upright piano jack stationary device according to the first aspect, the stopper has a contact surface in surface contact with the jack.

  According to this configuration, since the jack comes into surface contact with the contact surface of the stopper, the load acting on the stopper from the jack at that time is evenly distributed over the entire contact surface of the stopper. Therefore, it is possible to suppress the change in the thickness of the stopper, and thereby it is possible to keep the stationary position of the jack at an appropriate position for a long time.

  The invention according to claim 3 is the jack stationary device for the upright piano according to claim 1 or 2, wherein the stationary member is a center rail.

  According to this configuration, the stopper is provided on the center rail. The center rail is usually provided on the upright piano, and is fixed adjacent to the rear of the jack. Therefore, the stopper can be appropriately installed while satisfying the condition of the stationary member that is immovable. In addition, since the existing center rail is also used as a stationary member, a separate stationary member is not necessary, so that the manufacturing cost can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an action 1, keyboard 2, hammer 3 and the like of an upright piano to which the present invention is applied in a key release 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 number of keys 2a (only one is shown) arranged in the left-right direction of the upright piano. Each key 2a extends in the front-rear direction (left-right direction in FIG. 1), and is supported at the center by a balance pin 5a erected on a collar 5 on a shelf (not shown). Yes. Further, a back rail 6 is provided at the rear of the collar 5, and the rear end portion of each key 2 a is placed on the back rail 6.

  Action brackets (not shown) are respectively provided on the left and right ends of the shelf board. The action 1 is disposed above the rear end of the keyboard 2 and is provided between both action brackets. The action 1 includes a whippen 11, a jack 13 and a bat 15, and these are provided for each key 2a (only one is shown).

  A center rail 29 (stationary member), a hammer rail 30 and the like are passed between the left and right action brackets. The center rail 29 is made of an extruded product of aluminum, for example, has a predetermined constant cross-sectional shape, and is fixed to the left and right action brackets. Further, a whippen flange 12 is screwed to the lower end portion of the center rail 29, and a butt flange 17 and a damper flange 28 are screwed to the upper end portion for each key 2a (only one is shown). The whippen 11 is rotatably supported by the whippen flange 12 at the rear end. The bat 15 integrally constitutes the hammer assembly 4 together with the hammer 3 and the like, and is supported at the lower end portion thereof by the butt flange 17 so as to be rotatable via a center pin 15d.

  The wippen 11 is formed in a predetermined shape by, for example, a synthetic resin, has a heel portion 11a protruding downward from the front portion thereof, and a capstan button 2b provided at the rear end portion of the corresponding key 2a, It is placed via the part 11a. Further, a back check wire 18 a is provided upright at the front end portion of the upper surface of the wippen 11, and the back check 18 is attached to the tip portion thereof. Further, a spoon 19 for driving a damper 25 described later is provided upright on the rear end portion of the upper surface of the wippen 11.

  The jack 13 is made of, for example, a synthetic resin molded product, and includes a base portion 13a extending in the front-rear direction and a hammer push-up portion 13b extending upward from the rear end portion of the base portion 13a. The jack 13 is rotatably supported at the corner of the base portion 13a and the hammer push-up portion 13b at the center of the wippen 11 via a pin-shaped fulcrum 13c. A jack spring 14 formed of a coil spring is provided between the base portion 13a and the wippen 11.

  As shown in FIG. 2, a stopper 31 is provided for each jack 13 on the front surface of the center rail 29 at a position immediately below the butt flange 17 (only one is shown). Each stopper 31 has a screw portion 31 a and a base portion 31 b integrated therewith, and is attached by screwing the screw portion 31 a into the center rail 29. The base 31b is formed in a disk shape, for example, and has a predetermined diameter so as not to interfere with the adjacent stopper 31. A felt 31c is attached to the front surface of the base 31b with, for example, a double-sided tape. The felt 31c is formed in a disk shape having the same diameter as the base 31b, has a predetermined thickness, and the front surface thereof is a contact surface 31d. The attachment angle and screwing amount of the stopper 31 to the center rail 29 are set so that the rear surface of the hammer push-up portion 13b of the jack 13 comes into surface contact with the contact surface 31d of the stopper 31 in the key release state. In the present embodiment, the stopper 31 is attached to the center rail 29 in a slightly inclined state. The center rail 29 and the stopper 31 as described above constitute the jack stationary device 10 of the present embodiment.

  The center rail 29 is provided with a plurality of regulating brackets 21 spaced apart from each other in the left-right direction (only one is shown), and each regulating bracket 21 has a corresponding stopper 31 adjacent to each other. , 31 and between jacks 13 and 13 extend forward. A regulating rail 22 extending in the left-right direction is attached to the front end portion of the regulating bracket 21, and a regulating button 20 is attached to the lower surface of each of the keys 2a by a regulating screw 22a. Each regulating button 20 faces the base portion 13a of the corresponding jack 13 from above.

  The bat 15 includes a bat body 15a, a bat skin 15b, a bat felt 16, and the like. The bat felt 16 is affixed to the lower end of the front surface of the bat main body 15a, and is formed in a block shape. The bat skin 15b is adjacent to the upper side of the bat felt 16 and is attached to the bat body 15a. The bat body 15a is made of, for example, a synthetic resin, has a predetermined shape, and is rotatably attached to the butt flange 17 through a center pin 15d. Further, a butt spring 15g is provided between the bat main body 15a and the bat flange 17, whereby the hammer assembly 4 is urged clockwise in FIG. The bat main body 15a is provided with a catcher shank 23a extending forward, and a catcher 23 is provided at a front end portion thereof, which faces the front back check 18.

  The hammer 3 is erected on the upper surface of each bat 15 and has a hammer shank 3a extending upward and a hammer head 3b provided at the upper end thereof. The hammer head 3b is a string S stretched rearward. Opposite to. Further, a damper 25 is rotatably attached to the damper flange 28 for each key 2a behind the center rail 29.

  With the above configuration, the jack 13 supports the hammer assembly 4 in a state where the jack 13 is stationary at a predetermined stationary position in the key release state. In this state, the hammer push-up portion 13b of the jack 13 is in surface contact with the contact surface 31d of the stopper 31 at the center of the rear surface thereof, so that the jack 13 is locked to the stopper 31. Further, the upper surface of the hammer push-up portion 13 b is engaged with the lower surface of the bat skin 15 b of the bat 15, and the corner portion of the upper end portion of the hammer push-up portion 13 b is in contact with the front surface of the bat felt 16.

  Hereinafter, a series of operations from the start to the end of the above-described upright piano key pressing will be described. When the player presses the key 2a from the key-released state shown in FIG. 1, the whippen 11 placed on the rear end portion thereof is pushed upward by the key 2a, and thus rotates upward (counterclockwise). To do. As the whippen 11 rotates, the jack 13 provided on the whippen 11 moves upward together, and the hammer assembly 4 is pushed up by the hammer push-up portion 13b of the jack 13 through the bat 15. , Turn counterclockwise toward the rear string S.

  When the key 2a further rotates, the front end portion of the base portion 13a of the jack 13 comes into contact with the regulating button 20 from below, so that the jack 13 is prevented from moving upward, so that the jack 13 is prevented from moving upward. Rotate clockwise. Then, when the key 2a further rotates, the hammer push-up portion 13b is disengaged forward from the bat 15 and the jack 13 is detached from the hammer assembly 4 (let-off). At this time, the weight of the hammer assembly 4 is lost from the touch weight of the key 2a, and the touch weight is rapidly reduced, thereby giving the player a let-off feeling.

  The hammer assembly 4 is rotated by inertia even after the jack 13 is detached, and the hammer 3 strikes the string S and vibrates it, thereby generating a piano sound. Then, the hammer assembly 4 is rotated and returned clockwise by the repulsive force of the string S and the urging force of the butt spring 15g.

  As the key depression is completed and the key 2a is released, the key 2a, the action 1, and the like return and rotate in the opposite direction to that during key depression. Specifically, as the whippen 11 returns and rotates, the jack 13 moves downward together with the whippen 11, and the biasing force of the jack spring 14 g as the base portion 13 a is detached from the regulating button 20 on the way. To return and rotate counterclockwise.

  On the other hand, the hammer assembly 4 is further rotated back in the clockwise direction by the urging force of the butt spring 15g. In the middle of this, the hammer push-up portion 13b of the jack 13 that is rotating and turning back enters the lower side of the bat 15, and the rear surface of the hammer push-up portion 13b contacts the contact surface 31d of the stopper 31 in a surface contact state. . As a result, the jack 13 is locked to the stopper 31 and finally stops at the stationary position. In this state, the upper end portion of the hammer push-up portion 13 b is in contact with the front surface of the butt felt 16.

  As described above, according to the present embodiment, when the jack 13 returns and rotates, the jack 13 is locked and stopped by the stopper 31 provided on the stationary center rail 29. The jack 13 can be positioned at a predetermined stationary position with high accuracy and can be stopped as compared with the case where the movable bat 15 is stopped by the bat felt 16. As a result, the stationary position of the jack 13 is maintained at an appropriate position, so that proper operation of the jack 13 and the hammer 3 can be ensured, and thereby, the touch feeling and the repeatability of the key 2a can be favorably maintained. .

  Further, since the hammer push-up portion 13b of the jack 13 comes into surface contact with the contact surface 31d of the stopper 31, the load acting on the stopper 31 from the jack 13 at that time is evenly distributed over the entire contact surface 31d of the stopper 31. . As a result, the change in the thickness of the stopper 31 can be suppressed, so that the stationary position of the jack 13 can be maintained at an appropriate position for a long time.

  The center rail 29 is disposed adjacent to the rear of the jack 13. Therefore, by using such a center rail 29, the stopper 31 can be appropriately installed while satisfying the condition of the stationary member that is stationary. Moreover, since the existing center rail 29 is also used as a stationary member, a separate stationary member is not necessary, so that the manufacturing cost can be reduced.

  The stopper 31 is provided for each key 2 a and is attached by screwing into the center rail 29. Therefore, by adjusting the screwing amount of the stopper 31, the position of the stopper 31 in the front-rear direction can be finely adjusted, so that the stationary position of the jack 13 can be obtained with a good touch feeling and repetitive strikeability of the key 2 a. It is possible to finely set the optimal position for each key 2a. In addition, since the jack 13 contacts the felt 31c of the flexible stopper 31, the impact at the time of the contact can be sufficiently mitigated and the generation of noise can be suppressed.

  In addition, this invention can be implemented in various aspects, without being limited to the embodiment described above. For example, in the embodiment, felt is used for the portion of the stopper 31 with which the jack 13 abuts. However, any other suitable material can be adopted instead of the felt. For example, in addition to flexibility, it is preferable to use a material having dimensional stability and wear resistance against repeated changes from humidity or a repeatedly acting jack 13, such as a chemical fiber such as a fluororesin fiber. Thereby, a change in the thickness of the stopper 31 can be further suppressed, and the stationary position of the jack 13 can be maintained at an appropriate position for a longer period.

  In the embodiment, the stopper 31 is provided for each key 2a. However, for example, a stopper extending in the left-right direction may be provided for all the keys 2a or for each of the plurality of keys 2a. 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 keyboard, action, hammer, etc. of the upright piano to which the jack stationary apparatus by this invention is applied in a key release state. FIG. 2 is a partially enlarged side view showing the jack and the jack stationary device of FIG. 1.

Explanation of symbols

2a Key 3 Hammer 13 Jack 10 Jack stationary device 29 Center rail (stationary member)
31 Stopper 31d Contact surface

Claims (3)

A jack stationary device of an upright piano that pushes a hammer in accordance with a key depression and rotates the jack to be stationary at a predetermined stationary position in a key release state,
An immobile stationary member;
A stopper provided on the stationary member and locked at the predetermined stationary position by locking the jack that returns and rotates when the key is released;
An upright piano jack stationary device.   The jack stop device for an upright piano according to claim 1, wherein the stopper has a contact surface in surface contact with the jack. The upright piano jack stationary apparatus according to claim 1, wherein the stationary member is a center rail.

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