JP4358974B2 - Automatic performance piano damper drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a damper driving device for an automatic performance piano that drives a damper to give a loud effect in an automatic performance piano configured to perform performance by switching between acoustic performance and automatic performance.
[0002]
[Prior 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 pivotable loud pedal 2 provided at a player's foot, and a pedal uplift that is connected to the rear end of the loud pedal 2 and extends in the vertical direction. A central portion is rotatably supported by a rod 3 and a lever fulcrum 5 provided on the shelf plate 4, a loud lever 6 with which a pedal lifting rod 3 abuts from below on a front end portion, and a lower end on a loud lever 6. A lifting thrust bar 8 that is mounted and extends in the vertical direction through the guide 7 and the shelf board 4 and a plurality of dampers (not shown) that are mounted on the lifting thrust bar 8 and that are mounted on the lifting thrust bar 8. The pivotable lifting rail 9 is provided.
[0003]
The loud pedal 2 is juxtaposed with the other two pedals (not shown) on the right side when viewed from the front of the pedal box 11 provided at the lower end of the pedal column 10 extending downward from the shelf board 4 and protrudes forward and backward. The central portion is supported by the pedal fulcrum 12 so as to be rotatable. Further, the pedal lifting rod 3 is passed through a pedal lifting rod guide 13 attached to the back surface of the pedal column 10, and the pedal lifting rod guide 13 guides the movement in the vertical direction. Further, a coiled lever return spring 14 is provided between a portion of the loud lever 6 immediately in front of the lever fulcrum 5 and the shelf plate 4 via a spring receiver (not shown). 5 is always urged downward by a predetermined spring force.
[0004]
With the above configuration, when the loud pedal 2 is stepped on during the acoustic performance of this automatic performance piano, the pedal lift rod 3 is driven upward, so that the loud lever 6 is brought into the spring force of the lever return spring 14. The lifting push rod 8 is driven upward by being pushed up against the lever fulcrum 5 and pivoting clockwise in FIG. Then, the lifting rail 9 is pushed up by the lifting thrust bar 8 and pivoted upward, whereby the plurality of dampers are separated from the strings all at once, thereby obtaining a loud effect during acoustic performance. When the operation of depressing 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.
[0005]
On the other hand, the support column 15 is provided with a solenoid 16 for providing a loud effect during automatic performance. The solenoid 16 includes a main body portion 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 portion 16a and protrudes downward. The plunger 16b is in contact with the rear end portion of the loud lever 6 from above. With this configuration, when the solenoid 16 is energized, the plunger 16b depresses the loud lever 6 against the spring force of the lever return spring 14 and rotates it clockwise. As a result, the lifting rail 9 is pushed up via the lifting thrust rod 8 and pivoted upward to obtain a loud effect during automatic performance. When the energization of the solenoid 16 is finished, the respective components return to their original positions by their own weight and the spring force of the lever return spring 14.
[0006]
As described above, in the damper driving device 51, the lever return spring 14 plays a role of returning the loud lever 6 and the like to their original positions after driving the damper, both during automatic performance and during acoustic performance. . The lever return spring 14 is disposed in the vicinity of the lever fulcrum 5. This is because by reducing the moment around the lever fulcrum 5 by the lever return spring 14, the load on the solenoid 16 is reduced and the size of the solenoid 16 is reduced. This is to suppress as much as possible the noise generated by the contact.
[0007]
[Problems to be solved by the invention]
However, in the damper driving device 51 described above, the lever return spring 14 is disposed in the vicinity of the lever fulcrum 5 and the moment around the lever fulcrum 5 is small. The acting spring force is also very small. As a result, when the loud pedal 2 is stepped on, only the weights of the two lifting rods 3 and 8 and the lifting rail 9 act as reaction forces, so the depression reaction force of the loud pedal 2 becomes too light. There is a disadvantage that a sense of incongruity occurs during acoustic performance.
[0008]
In order to eliminate such drawbacks, for example, as shown in FIGS. 3 and 4, for example, a coil spring 52 or a leaf spring 53 for urging the loud pedal 2 in the return direction may be attached in the pedal box 11. Are known. However, in this structure, since the space in the pedal box 11 is narrow, the attachment is not easy and adjustment of the spring force is difficult. In addition, because of the space, the coil spring 52 and the leaf spring 53 must be arranged near the pedal fulcrum 12, so that a strong force acts on the coil spring 52 and the leaf spring 53, and the deformation thereof occurs. It is easy and it is difficult to keep the spring force constant, and in the case of the leaf spring 53 in particular, it is easy to cause noise.
[0009]
The present invention has been made in order to solve such problems, and has a relatively simple configuration, which does not increase the load of an actuator that drives a damper during automatic performance, and is suitable for acoustic performance during acoustic performance. It is an object of the present invention to provide a damper drive device for an automatic performance piano that can secure a stepping reaction force.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a damper driving device for an automatic performance piano that drives a damper to provide a loud effect in an automatic performance piano configured to perform performance by switching between acoustic performance and automatic performance. A rotatable loud pedal that is depressed to obtain a loud effect during acoustic performance, and a pedal that is connected to the loud pedal at the lower end and extends in the vertical direction, and is driven upward when the loud pedal is depressed. A lifting rod, a pedal lever that contacts the pedal from below, is pushed up by the driven pedal lifting rod, and rotates in a predetermined direction so as to drive a damper. Actuator that rotates in a predetermined direction by pressing the loud lever to obtain a loud effect during performance And over motor is characterized in that it comprises direct pedal 突揚 rod downward, a return spring for urging the.
[0011]
According to the damper driving device for this automatic performance piano, when the loud pedal is depressed during the acoustic performance, the pedal lifting rod moves upward against the spring force of the return spring that directly biases it downward. Driven. Then, the loud lever is pushed up by the driven pedal lifting rod, and the damper is driven by rotating in a predetermined direction, thereby obtaining a loud effect. On the other hand, at the time of automatic performance, an actuator composed of a solenoid or the like is operated, and a loud effect is obtained by pressing a loud lever and rotating it in the same predetermined direction as during acoustic performance.
[0012]
As described above, in the damper driving device according to the present invention, the return spring directly urges the pedal lifting rod downward, so that the spring force of the return spring acts as a large reaction force when the loud pedal is depressed. . Therefore, an appropriate depression reaction force can be ensured without causing a sense of incongruity during the depression operation of the conventional loud pedal. Further, since the pedal lifting rod is in contact with the loud lever from below, the spring force of the return spring that biases the pedal lifting rod downward does not act on the actuator. Therefore, since the load on the actuator does not increase by adding the return spring, the damper can be driven well without increasing the size of the actuator. Furthermore, the present invention can be configured simply by adding a return spring to an existing damper drive device.
[0013]
In this case, a pedal lift bar guide that guides the pedal lift bar in the vertical direction, an upper spring receiver that is provided below the pedal lift bar guide and through which the pedal lift bar is passed, and a pedal lift bar A lower spring receiver provided at a position below the upper spring receiver so as to be movable in the vertical direction, and a stopper for restricting the downward movement of the lower spring receiver. It is preferable that the coil spring is constituted by a coil spring that is passed through the lifting rod and contacts the upper and lower spring receivers.
[0014]
In this configuration, the pedal lifting rod is urged downward by the coil springs that contact the upper and lower spring receivers, and the spring force of the return spring, that is, the loud pedal, by the stopper that restricts the downward movement of the lower spring receiver. The stepping reaction force can be adjusted. Further, as described in the description of the conventional damper driving device, the pedal lifting rod guide is usually provided on the grand type automatic performance piano, and the coil spring and its spring receiver are also usually provided on the loud lever or the like. Therefore, according to this configuration, it is possible to simply configure the damper driving device according to claim 1 only by preparing a new stopper while using existing components or components common thereto.
[0015]
Furthermore, in this case, the stopper includes a stopper main body that is attached to the pedal lifting rod so as to be movable in the vertical direction, and a fixing means that can fix the stopper main body to the pedal lifting rod at an arbitrary position in the moved vertical direction. It is preferable to have.
[0016]
In this configuration, by fixing the stopper body of the stopper to an arbitrary position in the vertical direction of the pedal lifting rod with a fixing means, the stepping reaction force of the loud pedal can be steplessly and easily according to preference. Can be adjusted.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a damper driving device for a grand-type automatic performance grand piano according to an embodiment of the present invention. Since the basic configuration of the damper driving device 1 is the same as that of the conventional damper driving device 51 of FIG. 2 already described, common components are denoted by the same reference numerals, and the description thereof is appropriately described. In addition, the description will be omitted, and the description will be focused on the newly added configuration.
[0018]
As is apparent from comparison with FIG. 2, this damper driving device 1 is provided with upper and lower spring receivers 21 a and 21 b, a return spring 22 and a stopper 23 on the pedal lifting rod 3 in addition to the conventional damper driving device 51. It is a thing.
[0019]
The upper and lower spring receivers 21a and 21b have the same configuration, and are formed in a ring shape having a hole (not shown) penetrating in the vertical direction from metal or plastic. The upper and lower spring receivers 21a and 21b are attached to the lower position of the pedal lifting rod guide 13 of the pedal lifting rod 3 through the holes so as to be movable in the vertical direction.
[0020]
The stopper 23 includes a stopper main body 23a and a screw 23b (fixing means) attached to the stopper main body 23a. The stopper main body 23a is also a ring-shaped member made of metal, plastic, or the like, and is attached in a vertical direction to a position below the lower spring receiver 21b of the pedal lifting rod 3 through a hole (not shown). It has 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 moves in the vertical direction of the pedal lifting rod 3. It is fixed at any position.
[0021]
The return spring 22 is constituted by a coil spring, and is passed between the upper and lower spring receivers 21a and 21b of the pedal thrust bar 3, and the upper and lower ends are seat surfaces (not shown) of the spring receivers 21a and 21b. Respectively.
[0022]
According to the above configuration, the lower spring receiver 21b comes into contact with the stopper main body 23a of the stopper 23 fixed to the pedal lifting rod 3, and the downward movement is restricted, so that the pedal lifting rod 3 is The return spring 22 is always biased downward.
[0023]
The basic operation of the damper driving device 1 configured as described above is the same as that of the conventional damper driving device 51 of FIG. That is, when the loud pedal 2 is depressed during an acoustic performance, the pedal lifting rod 3 is driven upward against the spring force of the return spring 22. The pedal thrust bar 3 pushes up the loud lever 6 and pivots about the lever fulcrum 5 in the clockwise direction in FIG. 1 to drive the lifting thrust bar 8 upward. Then, the lifting rail 8 is pushed up by the lifting thrust bar 8 and pivoted upward, whereby the plurality of dampers are separated from the strings all at once, thereby obtaining a loud effect. On the other hand, at the time of automatic performance, the solenoid 16 (actuator) is actuated, and the plunger 16b presses the loud lever 6 downward to turn it clockwise, thereby obtaining a loud effect.
[0024]
As described above, in the damper drive device 1 according to the present embodiment, the return spring 22 directly biases the pedal lifting rod 3 downward, so that the spring force of the return spring 22 is obtained when the loud pedal 2 is stepped on. Acts as a large reaction force. Therefore, an appropriate depression reaction force can be ensured without causing a sense of incongruity during the depression operation of the loud pedal 2 as in the prior art. Further, since the pedal lifting rod 3 is in contact with the loud lever 6 from below, the spring force of the return spring 22 that biases the pedal lifting rod 3 downward does not act on the solenoid 16. Therefore, adding the return spring 22 does not increase the load on the solenoid 16, so that the damper can be driven well without increasing the size of the solenoid 16.
[0025]
Further, the stopper main body 23a of the stopper 23 can be fixed at an arbitrary position in the vertical direction of the pedal lifting rod 3 with a screw 23b, whereby the spring force of the return spring 22, that is, the stepping reaction force of the loud pedal 2 is obtained. Can be adjusted steplessly and easily according to preferences and the like.
[0026]
Furthermore, the damper driving device 1 of the present embodiment can be simply configured by adding the upper and lower spring receivers 21a and 21b, the return spring 22 and the stopper 23 to the existing damper driving device 51. In addition, the return spring 22 including the spring receivers 21a and 21b and the coil spring can use components having the same configuration that is normally provided in the loud lever or the like. The damper driving device 1 can be configured more simply.
[0027]
In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, the upper and lower spring receivers 21a and 21b are movably attached to the pedal lifting rod 3. However, the upper spring receiver 21a may be fixed to the pedal lifting rod guide 13 or lower. The spring receiver 21b may be configured integrally with the stopper main body 23a of the stopper 23. Further, although the screw 23b is used as a fixing means for fixing the stopper main body 23a to the pedal lifting rod 3, other appropriate fixing means can be adopted. Furthermore, as an actuator for driving the damper during automatic performance, other appropriate driving means may be adopted instead of the solenoid 16 of the embodiment. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.
[0028]
【The invention's effect】
As described above in detail, the damper driving device for an automatic performance piano according to the present invention has a relatively simple configuration, and does not increase the load of the actuator that drives the damper during automatic performance, so that an appropriate loud pedal can be used during acoustic performance. It has the effect of ensuring the stepping reaction force.
[Brief description of the drawings]
FIG. 1 is a partial side view showing a ground-type automatic piano damper drive device according to an embodiment of the present invention, with a part cut away.
FIG. 2 is a partial side view similar to FIG. 1, showing a conventional damper driving device.
FIG. 3 is a cross-sectional view showing a conventional example in which a coil spring is attached to a pedal box.
FIG. 4 is a cross-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 lifting rod 6 Loud lever 13 Pedal lifting rod 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)

An automatic performance piano configured to be able to perform by switching between acoustic performance and automatic performance, a damper drive device for an automatic performance piano that drives a damper to give a loud effect,
A rotatable loud pedal that is depressed to obtain a loud effect during acoustic performance,
A lower end of the pedal is connected to the loud pedal, extends in the vertical direction, and is driven upward by a depression operation of the loud pedal;
A pivotable loud lever that drives the damper by abutting the pedal thrust rod from below, thrust by the driven pedal thrust rod, and pivoting in a predetermined direction;
An actuator that rotates in the predetermined direction by pressing the loud lever to obtain a loud effect during automatic performance;
A return spring that directly biases the pedal thrust bar downward;
A damper driving device for an automatic performance piano, comprising: A pedal lift bar guide for guiding the pedal lift bar in the vertical direction;
An upper spring receiver provided below the pedal push-up bar guide, through which the pedal push-up bar is passed,
A lower spring receiver provided at a position below the upper spring receiver of the pedal push-up rod so as to be movable in the vertical direction;
A stopper for restricting the downward movement of the lower spring receiver, and
2. The damper driving device for an automatic performance piano according to claim 1, wherein the return spring is configured by a coil spring that is passed through the pedal lifting rod and abuts against the upper and lower spring receivers. The stopper includes a stopper body that is attached to the pedal lifting rod so as to be movable in the vertical direction, and a fixing means that can fix the stopper body to the pedal lifting rod at an arbitrary position in the moved vertical direction. The damper driving device for an automatic performance piano according to claim 2, wherein the damper driving device is provided.

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