JP2002014669A - Damper drive device for automatic playing piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper drive device for automatic playing piano which can assure the adequate treading reaction force of a damper pedal in acoustic playing without increasing the load on an actuator to drive the damper in automatic playing with a simple constitution. SOLUTION: This damper drive device has a freely turnable damper pedal 2 which is operated to be treaded in order to obtain a damper effect in acoustic playing, a pedal rod 3 which is connected at its bottom end to the damper pedal 2 and is driven upward by accompanying the treading operation of the damper pedal 2, a freely turnable damper pedal lever 6 which is abutted by the pedal rod 3 from below, is jerked up by the driven pedal rod 3 and drives the damper by turning in a prescribed direction, the actuator 16 which is turned in the prescribed direction by thrusting the damper pedal lever 6 in order to obtain the damper effect in the automatic playing and a resetting spring 22 which directly downwardly energizes the pedal rod 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper driving device for an automatic performance piano, which drives a damper to provide a loud effect in an automatic performance piano configured to be capable of switching between acoustic performance and automatic performance. About.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a damper driving device of a conventional grand type automatic performance grand piano.
As shown in the figure, the damper driving device 51 includes a rotatable loud pedal 2 provided at the player's feet, a pedal lifter which is connected at a lower end to a rear end of the loud pedal 2, and extends in a vertical direction. Rod 3 and lever fulcrum 5 provided on shelf 4
A central portion is rotatably supported, and a loud lever 6 with which the pedal lifting rod 3 abuts from below at the front end, and a lower end mounted on the loud lever 6, the guide 7 and the shelf plate 4
Lifting lifting rod 8 extending vertically through
And a rotatable lifting rail 9 mounted on the lifting rod 8 for driving a plurality of upper dampers (not shown).

The loud pedal 2 is arranged side by side with two other pedals (not shown) on the right side when viewed from the front of a pedal box 11 provided at the lower end of a pedal column 10 extending downward from the shelf plate 4. And the center is the pedal fulcrum 1
2 rotatably supported. In addition, pedal lift rod 3
Are passed through a pedal lift bar guide 13 attached to the back of the pedal post 10, and the pedal lift guide 13 guides the vertical movement. Further, a coil-shaped lever return spring 14 is provided between a portion of the loud lever 6 just in front of the lever fulcrum 5 and the shelf plate 4 via a spring receiver (not shown). 5
Is constantly urged downward by a predetermined spring force.

With the above construction, when the loud pedal 2 is depressed during the acoustic performance of the automatic performance piano, the pedal lifting bar 3 is driven upward, and the loud lever 6 is moved by the lever return spring 14. It is pushed up against the spring force,
, The lifting push-up bar 8 is driven upward. The lifting rail 8 is pushed up by the lifting rod 8,
By rotating upward, a plurality of dampers are simultaneously moved away from the strings, thereby obtaining a loud effect during acoustic performance. When the depression operation of the loud pedal 2 is completed, the driven components return to their original positions by their own weight and the spring force of the lever return spring 14 in the reverse operation.

On the other hand, the column 15 is provided with a solenoid 16 for giving a loud effect during automatic performance. The solenoid 16 includes a main body 16a attached to a side surface of the support column 15, and a plunger 16b that is vertically expandable and contractable with respect to the main body 16a and protrudes downward. The plunger 16b is in contact with the rear end of the loud lever 6 from above. With such a configuration,
When the solenoid 16 is energized, the plunger 16b
The loud lever 6 is pushed down against the spring force of the lever return spring 14 and rotated clockwise. As a result, the lifting rail 9 is pushed up via the lifting rod 8 and pivots upward, thereby obtaining a loud effect during automatic performance. When the energization of the solenoid 16 ends, each component returns to its original position by its own weight and the spring force of the lever return spring 14.

As described above, this damper driving device 51
Then, in both the automatic performance and the acoustic performance, the lever return spring 14 plays a role of returning the loud lever 6 and the like to the original position after driving the damper. Further, the lever return spring 14 is connected to the lever fulcrum 5
It is located near. This is the lever return spring 14
By reducing the moment around the lever fulcrum 5 due to the above, the load on the solenoid 16 is reduced, and the size of the solenoid 16 is reduced. To
This is to suppress as much as possible.

[0007]

However, in the above-described damper driving device 51, since the lever return spring 14 is disposed near the lever fulcrum 5 and the moment around the lever fulcrum 5 is small, the above-mentioned advantages are obtained. Is obtained, the spring force acting on the loud pedal 2 also becomes very small. As a result, when the loud pedal 2 is depressed,
Since only the weight of the two lifting rods 3, 8 and the lifting rail 9 acts as a reaction force, the loud pedal 2
There is a drawback in that the reaction force of the pedal becomes too light, and a sense of incongruity occurs during acoustic performance.

In order to solve such a disadvantage, for example, as shown in FIGS. 3 and 4, a coil spring 5 for urging the loud pedal 2 in a return direction is provided in a pedal box 11.
It is conventionally known to attach the second spring 2 and the leaf spring 53. However, in this configuration, since the space in the pedal box 11 is narrow, it is difficult to mount the pedal box 11, and it is difficult to adjust the spring force. In addition, since the coil spring 52 and the leaf spring 53 have to be arranged near the pedal fulcrum 12 due to space limitations, a strong force acts on the coil spring 52 and the leaf spring 53 to cause their deformation. And it is difficult to keep the spring force constant.
In this case, noise is likely to be generated.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a relatively simple structure, which does not increase the load on an actuator for driving a damper during an automatic performance, and increases the load during an acoustic performance. It is an object of the present invention to provide a damper driving device for an automatic performance piano which can secure a proper reaction force of a loud pedal.

[0010]

In order to achieve this object, the present invention relates to an automatic performance piano which can be switched between acoustic performance and automatic performance to provide a damper for providing a loud effect. A damper driving device for an automatic performance piano to be driven, wherein a rotatable loud pedal is operated to be depressed to obtain a loud effect during an acoustic performance, and a lower end portion is connected to the loud pedal to extend in a vertical direction and depress the loud pedal. A pedal push-up bar driven upward with the operation, the pedal push-up bar abuts from below, is pushed up by the driven pedal push-up bar, and rotates in a predetermined direction to drive the damper. By rotating the loud lever and pressing the loud lever to obtain a loud effect during automatic performance An actuator for rotating a constant direction, and characterized in that it comprises direct pedal 突揚 rod downward, a return spring for urging the.

According to the damper driving device for an automatic performance piano, when the loud pedal is depressed during the acoustic performance, the pedal raising bar directly opposes the spring force of the return spring which urges the same downward. , Is driven upward. Then, the loud lever is pushed up by the driven pedal raising bar, and the damper is driven by rotating in a predetermined direction, so that a loud effect is obtained. On the other hand, at the time of automatic performance, an actuator such as a solenoid is operated, and the loud lever is pressed and turned in the same predetermined direction as at the time of acoustic performance, whereby a loud effect is obtained.

As described above, in the damper drive device of the present invention, the return spring directly urges the pedal lifting bar downward, and the spring force of the return spring causes a large reaction force when the loud pedal is depressed. Act as Therefore, it is possible to secure an appropriate stepping reaction force without causing a feeling of incongruity at the time of the stepping operation of the loud pedal as in the related art. Further, since the pedal lifting rod is in contact with the loud lever from below, the spring force of the return spring that urges the pedal lifting rod downward does not act on the actuator. Therefore, the load on the actuator is not increased by adding the return spring, so that the damper can be favorably driven without increasing the size of the actuator. Further, the present invention can be simply configured by simply adding a return spring to an existing damper driving device.

In this case, a pedal lift bar guide for guiding the pedal lift bar in the up-down direction, an upper spring receiver provided below the pedal lift bar guide, and through which the pedal lift bar passes, The return spring further includes a lower spring receiver provided at a position below the upper spring receiver of the lifting rod so as to be movable in the vertical direction, and a stopper for restricting downward movement of the lower spring receiver. Is preferably constituted by a coil spring that is passed through the pedal lift bar and abuts the upper and lower spring receivers.

In this configuration, the pedal lifting rod is urged downward by the coil springs which contact the upper and lower spring receivers, and the spring force of the return spring is controlled by the stopper which regulates the downward movement of the lower spring receiver. That is, the stepping reaction force of the loud pedal can be adjusted. Further, as described in the description of the conventional damper driving device, the pedal lifting bar guide is usually provided on the ground type automatic playing piano, and the coil spring and its spring receiver are also usually provided on the loud lever and the like. According to this configuration,
The damper driving device according to claim 1 can be simply configured simply by newly preparing a stopper while using existing components and components common thereto.

Further, in this case, the stopper is a stopper body movably attached to the pedal raising bar in a vertical direction, and the stopper body can be fixed to the pedal lifting rod at an arbitrary position in the moved vertical direction. It is preferable to have fixing means.

In this configuration, the stopper main body of the stopper is fixed to an arbitrary position in the vertical direction of the pedal lifting bar by the fixing means, so that the stepping reaction force of the loud pedal can be steplessly adjusted according to preference or the like. And it can be easily adjusted.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a damper driving device of a grand type automatic performance grand piano according to an embodiment of the present invention. Note that the basic configuration of the damper driving device 1 is the same as that of the conventional damper driving device 51 of FIG. 2 described above, and thus the same reference numerals are given to the common components, and the description thereof will be appropriately made. , And will be described focusing on the newly added configuration.

As is clear from the comparison with FIG. 2, this damper driving device 1 includes a conventional damper driving device 51 and a pedal raising rod 3 and upper and lower spring receivers 21a, 21a.
b, a return spring 22 and a stopper 23 are provided.

The upper and lower spring receivers 21a and 21b have the same configuration, and are made of metal, plastic, or the like.
It is formed in a ring shape having a hole (not shown) penetrating vertically. The upper and lower spring receivers 21a and 21b allow the pedal lifting bar guide 1 of the pedal lifting bar 3 to pass through the holes.
It is attached to a position lower than 3 so as to be vertically movable.

The stopper 23 includes a stopper body 23a,
It is composed of a screw 23b (fixing means) attached to the stopper body 23a. The stopper body 23a is also a ring-shaped member made of metal, plastic, or the like, and is attached to a position below the lower spring receiver 21b of the pedal push-up bar 3 through a hole (not shown) in the vertical direction. Have been. The screw 23b is screwed into a screw hole (not shown) formed through the peripheral wall of the stopper main body 23a. By tightening the screw 23b, the stopper main body 23a is moved in the vertical direction of the pedal push-up rod 3. Is fixed at any position.

The return spring 22 is composed of a coil spring, and is provided with upper and lower spring receivers 21a, 21b of the pedal lifting rod 3.
Between the upper and lower ends of the spring receivers 21a and 21b.
, Respectively, in contact with the bearing surface (not shown).

According to the above configuration, the lower spring receiver 21b
Is abutted against the stopper main body 23a of the stopper 23 fixed to the pedal lifting bar 3, and the downward movement is regulated, whereby the pedal lifting bar 3 is constantly urged downward by the return spring 22. You.

The basic operation of the damper driving device 1 having the above configuration is the same as that of the conventional damper driving device 51 shown in FIG. That is, when the loud pedal 2 is depressed during the acoustic performance, the pedal lift bar 3 is driven upward against the spring force of the return spring 22. The loud lever 6 is pushed up by the pedal push-up bar 3 and is rotated clockwise in FIG. 1 around the lever fulcrum 5, whereby the lifting push-up bar 8 is driven upward. The lifting rail 9 pushes up the lifting rail 9 and rotates upward,
A loud effect can be obtained by moving a plurality of dampers away from the strings all at once. On the other hand, during automatic performance, the solenoid 16
The (actuator) is actuated, and the plunger 16b pushes the loud lever 6 downward to rotate clockwise, whereby a loud effect is obtained.

As described above, in the damper driving device 1 of the present embodiment, the return spring 22 directly urges the pedal lifting bar 3 downward, and the spring force of the return spring 22 depresses the loud pedal 2. It acts as a large reaction force in that case. Therefore, it is possible to secure an appropriate depressing reaction force without causing a feeling of incongruity when depressing the loud pedal 2 as in the related art. Further, since the pedal lifting bar 3 is in contact with the loud lever 6 from below, the spring force of the return spring 22 for urging the pedal lifting bar 3 downward does not act on the solenoid 16. Therefore, since the load of the solenoid 16 does not increase by adding the return spring 22, it is possible to drive the damper satisfactorily without increasing the size of the solenoid 16.

The stopper body 23a of the stopper 23
At any position in the vertical direction of the pedal lifting rod 3,
3b so that the return spring 22
, That is, the stepping reaction force of the loud pedal 2 can be adjusted steplessly and easily as desired.

Further, the damper driving device 1 of the present embodiment
The upper and lower spring supports 2
A simple configuration can be achieved simply by adding the 1a, 21b, the return spring 22, and the stopper 23. In addition, the return spring 2 composed of the spring receivers 21a and 21b and the coil spring
2 can use parts of a similar configuration usually provided in a loud lever or the like. Therefore, the damper driving device 1 can be used simply by newly providing a stopper 23.
Can be configured more simply.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, in the embodiment, the upper and lower spring receivers 21a, 21b
The upper spring receiver 21 a may be fixed to the pedal lifting bar guide 13, and the lower spring receiver 21 b may be integrated with the stopper body 23 a of the stopper 23. May be configured. Further, the screw 23b is used as a fixing means for fixing the stopper body 23a to the pedal push-up bar 3, but other appropriate fixing means can be adopted. Further, as a matter of course, other appropriate driving means may be employed as an actuator for driving the damper at the time of automatic performance, instead of the solenoid 16 of the embodiment. In addition, the configuration of the details can be appropriately changed within the scope of the present invention.

[0028]

As described above in detail, the damper driving device for an automatic performance piano according to the present invention has a relatively simple structure, and does not increase the load on the actuator for driving the damper during the automatic performance. This has the effect that an appropriate reaction force of the loud pedal can be ensured at times.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a damper driving device of a grand type automatic performance piano according to an embodiment of the present invention.

FIG. 2 is a partial side view similar to FIG. 1, showing a conventional damper driving device.

FIG. 3 is a sectional view showing a conventional example in which a coil spring is attached to a pedal box.

FIG. 4 is a sectional view showing a conventional example in which a leaf spring is attached to a pedal box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Damper drive device 2 Loud pedal 3 Pedal raising bar 6 Loud lever 13 Pedal raising bar guide 16 Solenoid (actuator) 21a Upper spring receiver 21b Lower spring receiver 22 Return spring 23 Stopper 23a Stopper body 23b Screw (fixing means)

Claims (3)

[Claims] 1. A damper driving device for an automatic performance piano for driving a damper for imparting a loud effect in an automatic performance piano configured to perform a performance by switching between an acoustic performance and an automatic performance. A rotatable loud pedal that is sometimes depressed to obtain a loud effect, and a pedal push-up rod whose lower end is connected to the loud pedal and extends in the up-down direction and is driven upward with the depressing operation of the loud pedal. When the pedal lift rod abuts from below and is pushed up by the driven pedal lift rod and rotates in a predetermined direction, a rotatable loud lever for driving the damper is provided. An act of rotating the loud lever in the predetermined direction by pressing the loud lever to obtain an effect And eta directly the pedal 突揚 rod downward, and a return spring for biasing,
A damper driving device for an automatic performance piano, comprising: 2. A pedal lift bar guide for vertically guiding the pedal lift bar, an upper spring receiver provided below the pedal lift bar guide, and through which the pedal lift bar passes, A lower spring receiver movably provided in a vertical direction at a position below the upper spring receiver of the pedal push-up bar; and a stopper for restricting downward movement of the lower spring receiver.
2. The automatic performance piano according to claim 1, wherein the return spring is configured by a coil spring passed through the pedal lifting bar and abutting on the upper and lower spring receivers. 3. Damper drive. 3. The stopper body is mounted on the pedal raising bar so as to be movable in the vertical direction, and the stopper body can be fixed to the pedal lifting bar at any position in the moved vertical direction. 3. The damper driving device for an automatic performance piano according to claim 2, further comprising a fixing means.