JP2015018277A - Key drive device and keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit, to a keyboard instrument part of whose keyboard is positioned above a leg beam, a key drive device for driving the keys without cutting and removing part of the leg beam.SOLUTION: A key drive device 10 is split into two drive units 10-L and 10-U; when a grand piano is to be fitted with the key drive device 10, in each of the drive units 10-L and 10-U, a solenoid housing 100b is inserted into a space 30b above a leg beam 4 configured in conjunction with a shelf plate 3; on the other hand, a solenoid housing 100a having in its lower part a substrate housing 200a in which a substrate for controlling actions of solenoids is inserted into a space 30a, different from the space 30b configured on the shelf plate 3.

Description

  The present invention relates to a technique of a key driving device that drives a key of a keyboard instrument.

In order to give an acoustic piano an automatic performance function, a space is created by scraping the shelf under the key, and a key drive device (key drive unit) having a solenoid for driving the key is attached to the space. ing. This key driving device operates a solenoid by a control signal according to the performance contents, and transmits a driving force from the lower surface side of the key near the rear end portion (back check side) of each key. As a result, the key is driven as if it was pressed by the performer, and a hammer hits the string to generate a sound.
Such a key drive device requires a large-scale processing for an acoustic piano due to the relationship of its mounting position, and it takes a long time to mount. For this reason, a technique for facilitating the process of attaching the key drive device to the acoustic piano has been developed (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2004-252302 JP 2001-343972 A

  In an acoustic piano, for example, from the viewpoint of design, not only the shelf board but also a leg girder that connects the leg and the shelf board may exist at both ends of the keyboard. In the technique disclosed in Patent Document 1, since all of the key driving device does not fit in the shelf plate, there is a portion where the key driving device protrudes below the shelf plate. Here, if there is a leg girder through the shelf under the key, the protruding part will be caught by the leg girder, so cut off a part of the leg girder before attaching the key drive device It had to be removed. When a key driving device is attached to such an acoustic piano, processing takes time and the appearance of the piano is changed.

  The present invention has been made in view of the above circumstances, and drives a key without cutting and removing a part of the leg girder for a keyboard instrument in which a part of the keyboard is positioned above the leg girder. The purpose is to attach a lock drive.

  In order to solve the above-mentioned problem, the present invention is attached to a keyboard instrument configured such that a part of a keyboard is positioned above a leg girder via a shelf board, and the keyboard according to an input control signal. A plurality of actuators that respectively drive the keys, and a control circuit that controls operations of the plurality of actuators according to the control signal, and the shelf. A plurality of elongate drive units that are inserted into a vertically removed removal space formed by removing a portion of the plate and are attached to the keyboard instrument, the drive unit comprising an actuator housing portion and a control circuit; There is provided a key driving device having a housing portion, wherein the actuator housing portion and the control circuit housing portion are arranged in a horizontal lateral direction of the drive unit.

  In another preferred aspect, in the key driving device, when the driving unit is attached to a keyboard instrument, the lower surface of the shelf board and the lower surface of the key driving device constitute substantially the same surface. And

  According to the present invention, a key driving device that drives a key can be attached to a keyboard instrument in which a part of the keyboard is positioned above the leg girder without cutting and removing a part of the leg girder.

It is a figure explaining the external appearance of the automatic performance piano in embodiment of this invention. It is a figure explaining the cross-sectional structure of the part which does not include the leg girder in the automatic performance piano in embodiment of this invention. It is a figure explaining the cross-sectional structure of the part containing the leg girder in the automatic performance piano in embodiment of this invention. It is a figure explaining the positional relationship of a shelf board, a leg beam, and a key drive device at the time of seeing from the front direction of the automatic performance piano in the embodiment of the present invention. It is a figure explaining the structure of the key drive device in embodiment of this invention. It is a figure explaining the structure when the key drive device in embodiment of this invention isolate | separates for every drive unit. It is sectional drawing of the key drive device seen from the arrow VII-VII direction shown in FIG. It is sectional drawing of the key drive device seen from the arrow VIII-VIII direction shown in FIG. It is a figure explaining the example which attaches the key drive device in embodiment of this invention to a grand piano. It is a figure following FIG. 9 explaining the example which attaches the key drive device in embodiment of this invention to a grand piano. It is a figure following FIG. 10 explaining the example which attaches the key drive device in embodiment of this invention to a grand piano. It is a figure which shows the relationship between a key drive device and a shelf board at the time of seeing the key drive device shown in FIG. 11 from the downward direction. It is a figure explaining the structure of the key drive device in the modification 1 of this invention. It is a figure explaining the structure of the key drive device in the modification 2 of this invention. It is sectional drawing of the key drive device seen from the arrow XV-XV direction shown in FIG.

<Embodiment>
[Appearance of auto-playing piano]
FIG. 1 is a diagram illustrating the appearance of an automatic performance piano 1 according to an embodiment of the present invention. The auto-playing piano 1 has a keyboard 2 in which a plurality of (in this example, 88) keys 20 are arranged side by side on the front, and a shelf board 3 and legs 5 positioned below the keyboard 2. A leg girder 4, a pedal 8 and a controller 11 are connected to the shelf board 3. The leg girders 4 are located on both ends (the left and right ends of the automatic performance piano 1) in the direction in which the keys 20 of the keyboard 2 are arranged. That is, a part of both ends of the keyboard 2 is configured to be positioned via the shelf 3 above the leg girder 4. The automatic performance piano 1 is configured by attaching a key driving device of the present invention to a general grand piano. The key 20 of the automatic performance piano 1 is driven by this key driving device.

The controller 11 includes an arithmetic unit such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and acquires performance information such as a MIDI (Musical Instrument Digital Interface) format. In response to the performance information, a control signal for instructing the driving mode of the key 20 is output to the key driving device. The performance information may be input from an external input terminal or the like, or may be stored in advance in a storage unit or the like.
Next, the position of the key driving device attached to the automatic performance piano 1 will be described with reference to FIGS.

[Position of lock driving device 10]
FIG. 2 is a diagram illustrating a cross-sectional configuration of a portion not including the leg girder 4 in the automatic performance piano 1 according to the embodiment of the present invention. This cross-sectional configuration shows a configuration when the cross section along the extending direction of the key 20 is viewed along the direction in which the keys 20 are arranged. The key 20 is rotatably supported by the balance pin 7. When the front end of the key 20 (the side pressed by the performer (left side in FIG. 2)) is pressed, the key 20 rotates about the balance pin 7 and the rear end of the key 20 (the front end with respect to the balance pin 7). The end on the opposite side of the part rises. A sound is generated when the action mechanism 6 operates and the hammer strikes the string.

The shelf 3 has a space 30 a below the rear end of the key 20. The space 30a is formed by cutting a part of the shelf board 3 so as to penetrate in the vertical direction, and has a substantially rectangular parallelepiped shape extending along the direction in which the keys 20 are arranged. The key driving device 10 includes a solenoid housing portion 100a that houses a solenoid that is an example of an actuator that drives the key 20 by applying a driving force to the key 20, and a control circuit that operates the solenoid based on the control signal described above. It has the board | substrate storage part 200a which accommodates the comprised board | substrate 210 (refer FIG. 8). The key driving device 10 is fixed to the shelf board 3 by being screwed to the shelf board 3 with screws 15.
The key driving device 10 operates the solenoid based on a control signal from the controller 11 to rotate the key 20 by pushing up the rear end portion of the key 20, and when the performer depresses the front end portion of the key 20. The same operation is realized.

FIG. 3 is a diagram illustrating a cross-sectional configuration of a portion including the leg girder 4 in the automatic performance piano 1 according to the embodiment of the present invention. Unlike the case shown in FIG. 2, a leg girder 4 exists below the shelf 3. The shelf 3 has a space 30 b below the rear end of the key 20. The space 30b is formed by cutting through the shelf 3 so as to penetrate in the vertical direction, and has a substantially rectangular parallelepiped shape extending along the direction in which the keys 20 are arranged. Unlike the space 30a, the space 30b includes a leg girder 4 below and includes a space formed between the keyboard 2 and the leg girder 4.
The space 30a and the space 30b described above constitute a continuous space and have a substantially rectangular parallelepiped shape as a whole. Hereinafter, the space 30a and the space 30b are collectively referred to as the space 30.

  The key driving device 10 in this portion has a solenoid housing portion 100b in which a solenoid is housed, but does not have a configuration corresponding to the substrate housing portion 200a that houses the substrate on which the control circuit is configured. . The solenoid housing portion 100b is configured to be continuous with the solenoid housing portion 100a, and refers to a portion that does not have a configuration corresponding to the substrate housing portion 200a at the bottom. In FIG. 3, the solenoid housing portion 100b is not in contact with other components, but is configured continuously with the solenoid housing portion 100a, and therefore the positional relationship with the other components is fixed.

  FIG. 4 is a diagram for explaining the positional relationship among the shelf board 3, the leg girder 4, and the key driving device 10 when viewed from the front direction of the automatic performance piano 1 in the embodiment of the present invention. The key drive device 10 is connected to the drive unit 10-L that drives the low-frequency key 20, the drive unit 10-U that drives the high-frequency key 20, and the drive unit 10-L and the drive unit 10-U. A connecting portion 300 is provided. The drive units 10-L and 10-U are each formed in a long shape, and have a solenoid housing portion 100c in addition to the solenoid housing portions 100a and 100b described above. As described above, the substrate storage portion 200a exists under the solenoid storage portion 100a, and does not exist under the solenoid storage portions 100b and 100c. In addition, although the several hole which can pass air is provided in the side surface of the board | substrate storage part 200a, it does not need to be provided.

  The solenoid housing portion 100c is configured continuously with the solenoid housing portion 100a, like the solenoid housing portion 100b. Moreover, the solenoid accommodating part 100c is comprised so that attachment of the connection part 300 for connecting with an adjacent drive unit is possible. In this example, the solenoid housing part 100c has a screw hole (not shown) for screwing the connecting part 300 in the lower part.

Further, as shown in FIG. 4, a pedal lever 80 exists below the solenoid housing portion 100c. The pedal lever 80 operates in conjunction with the movement of the pedal 8 when the pedal 8 is pressed, and transmits the operation to the action mechanism 6.
Hereinafter, the solenoid housing portions 100a, 100b, and 100c are collectively referred to as the solenoid housing portion 100. Next, the configuration of the lock driving device 10 will be described.

[Configuration of Key Drive Device 10]
FIG. 5 is a diagram illustrating the configuration of the lock driving device 10 according to the embodiment of the present invention. FIG. 5A is a view of the lock driving device 10 as viewed from above. FIG. 5B is a view of the key driving device 10 as viewed from the front of the automatic performance piano 1 (the same direction as FIG. 4). The key drive device 10 has an opening 400 used for screwing when connecting and fixing to the shelf board 3 on the upper surface side (solenoid storage unit 100 side) of the substrate storage unit 200a. Further, on the upper surface side of the solenoid housing portion 100, a tip portion of the plunger head 110 in the solenoid 101 (see FIGS. 7 and 8) that gives a driving force to the key 20 protrudes. In this example, since 88 solenoids 101 exist corresponding to all the keys 20, 88 plunger heads 110 protrude. The solenoid housing portion 100 has a shape extending in one direction so that these solenoids 101 are housed in two rows along the direction in which the keys 20 are arranged.

  As described above, the lock driving device 10 includes the drive units 10-L and 10-R connected by the connecting unit 300. The drive unit 10-L and the drive unit 10-U are configured to be separable at the boundary portion P by removing the connecting portion 300.

  FIG. 6 is a diagram illustrating a configuration when the lock driving device 10 according to the embodiment of the present invention is separated for each drive unit. FIG. 6A is a view of the lock driving device 10 as viewed from above. FIG. 6B is a view of the key drive device 10 as viewed from the front of the automatic performance piano 1 (the same direction as FIG. 4). As shown in FIG. 6, the key drive device 10 can be separated into the drive unit 10 -L and the drive unit 10 -U at the boundary portion P when the connecting portion 300 is removed. This boundary portion P has a stepped shape when viewed from above according to the arrangement of the plunger head 110 (solenoid 101).

  FIG. 7 is a cross-sectional view of the key drive device 10 as seen from the direction of arrows VII-VII shown in FIG. As described above, the solenoid 101 is accommodated in the solenoid accommodating portion 100b. The solenoid 101 has a plunger 120 and a coil 130 with a plunger head 110 attached to the tip. The plunger 120 moves upward according to the current supplied to the coil 130 and pushes up the rear end portion of the key 20 via the plunger head 110. The solenoid housing 100c has the same internal configuration as the solenoid housing 100a.

  FIG. 8 is a cross-sectional view of the key drive device 10 as seen from the direction of arrows VIII-VIII shown in FIG. The solenoid 101 is housed in the solenoid housing 100a in the same manner as the solenoid housing 100b. A substrate 210 having a control circuit is stored in the substrate storage portion 200a. The control circuit is a circuit that operates the plunger 120 by supplying a current to the coil 130 of the solenoid 101 based on a control signal output from the controller 11. The substrate 210 not only supplies current to the coil 130 of the solenoid 101 housed in the solenoid housing part 100a, but also supplies current to the coil 130 of the solenoid 101 housed in the solenoid housing parts 100b and 100c. The control circuit is configured to supply In the description of each figure, description of wiring for supplying current from the substrate 210 to the coil 130 of the solenoid 101 is omitted. In this example, the substrate 210 is composed of one layer, but may be composed of a plurality of layers.

[Attachment example of lock driving device 10]
The automatic performance piano 1 is configured by attaching a key driving device 10 to a grand piano. An example of attaching the key drive device 10 to a general grand piano will be described with reference to FIGS. 9, 10, and 11.

FIG. 9 is a diagram illustrating an example in which the key driving device 10 according to the embodiment of the present invention is attached to a grand piano. FIG. 9 shows the positional relationship between the shelf board 3 and the leg girder 4 when viewed from the front direction of the grand piano. The shelf board 3 in the grand piano to which the key driving device 10 has never been attached is in a state where the space 30 does not exist. Therefore, the worker performs processing such as cutting so as to penetrate the shelf plate 3 in the vertical direction to form a space 30 as shown in FIG. As described above, the space 30 has a substantially rectangular parallelepiped shape, and is large enough to insert the solenoid housing portion 100 of the key driving device 10. In addition, both ends of the space 30 are configured to extend to the outside of the keys 20 at both ends of the keyboard 2. In addition, about the upper part (space 30b) of the leg girder 4 among the spaces 30 comprised in the shelf board 3, you may process after removing the leg girder 4 once. In this state, the pedal lever 80 is removed.
In this state where the space 30 is formed on the shelf board 3, the operator attaches the lock driving device 10.

  FIG. 10 is a diagram following FIG. 9 for explaining an example in which the key driving device 10 according to the embodiment of the present invention is attached to the grand piano. As shown in FIG. 10, the lock driving device 10 is inserted into the space 30 in a state of being divided into drive units 10 -L and 10 -U. At this time, the solenoid housing portion 100b is inserted into the space 30b with the drive units 10-L and 10-U tilted from the horizontal plane. The total length of the solenoid housing portion 100 in the drive unit 10-L in the longitudinal direction and the overall length in the drive unit 10-U in the longitudinal direction of the solenoid housing portion 100 is the length in the longitudinal direction of the space 30a (both sides). Longer than the length between the leg girders 4). Therefore, the operator needs to insert the drive units 10-L and 10-U in an inclined state. Although not shown in FIG. 10, since the key 20 is present above the shelf 3 (space 30) as shown in FIG. 3, the drive units 10-L and 10-U are connected to the plunger head 110. Is inserted while adjusting the amount of tilting so as not to contact the key 20.

  FIG. 11 is a diagram following FIG. 10 for explaining an example in which the lock driving device 10 according to the embodiment of the present invention is attached to the grand piano. 11, the drive units 10-L and 10-U are moved from the state shown in FIG. 10 to a horizontal state, and the portion where the opening 400 is present on the upper surface of the substrate storage portion 200a is the lower surface 3D of the shelf board 3. The contact state is shown. In this state, the drive unit 10-L and the drive unit 10-U are separated from each other.

  In this state, the operator electrically connects the substrate 210 in the drive unit 10-U and the substrate 210 in the drive unit 10-L before bringing the drive unit 10-L and the drive unit 10-U into close contact with each other. Connect. In this example, each of the drive units 10-L and 10-U has a cable (not shown) for electrically connecting the board 210 and its own board 210 in the adjacent drive unit. This cable is configured to be able to pass through the inside of the solenoid housing portion 100c and be taken out from the boundary portion P to the outside of the solenoid housing portion 100. When connected to each other by a connector provided at the tip of each cable, the substrate 210 in the drive unit 10-U and the substrate 210 in the drive unit 10-L are electrically connected.

  FIG. 12 is a diagram illustrating a relationship between the key driving device 10 and the shelf board 3 when the key driving device 10 illustrated in FIG. 11 is viewed from below. Since FIG. 12 is a case where the key drive device 10 is seen from below, the lower surface 3D of the shelf 3 can be seen in the shelf 3 except for the portion where the leg girder 4 is present. From this state, the operator brings the drive unit 10-L and the drive unit 10-U closer to contact the boundary portion P, and the connecting portion 300 is attached. At this time, since the boundary portion P has a stepped shape, alignment in the horizontal direction at the time of connection becomes easy. Further, the upper surface of the substrate storage portion 200a of the drive units 10-L, 10-U and the lower surface 3D of the shelf board are in contact with each other, and the position in the horizontal direction is further increased by the connecting portion 300 attached to the lower portion of the solenoid storage portion 100c. The alignment becomes easy and the alignment in the vertical direction becomes easy. Moreover, the connection part 300 can be used also as a cover of the cable and connector which connect an adjacent drive unit. In addition, when the board | substrate 210 in the drive unit 10-U and the board | substrate 210 in the drive unit 10-L are electrically connected, it is not connected using the above-mentioned connector but electrically via the attached connection part 300. FIG. You may make it connect.

  Further, the key driving device 10 is fixed to the shelf plate 3 by passing the screw 15 (see FIG. 2) through the opening 400 and screwing the key driving device 10 to the shelf plate 3. When fixed, the distance between the tip of the plunger head 110 and the key 20 may be adjusted.

  Further, this screwing may be temporarily performed in a state where the drive unit 10-L and the drive unit 10-U are separated from each other. This is because the opening shape of the opening 400 extends in the direction of movement when the drive unit 10-L and the drive unit 10-U are brought into contact (the direction in which the keys 20 are arranged). However, this is because the drive unit 10-L and the drive unit 10-U can be moved in the direction of contact. It should be noted that the drive unit 10-L and the drive unit 10-U are connected to each other with the portions inserted into the space 30b of the drive units 10-L and 10-U supported by the leg girders 4 without being screwed. You may make it connect with the connection part 300, and you may make it fix to the shelf 3 after that.

Thereafter, the state in which the pedal lever 80 is attached to the lower part of the solenoid housing portion 100c is the state shown in FIG. 4 described above. In addition, the automatic performance piano 1 of this invention can be comprised by attaching the controller 11 etc. to a grand piano.
Note that when performing maintenance or the like by removing the key drive device 10 from the automatic performance piano 1, the operator reverses this procedure and reattaches the key drive device 10 that has been maintained in the above procedure. After the space 30 is formed on the shelf board 3, the key driving device 10 can be attached and detached without removing the leg beam 4 from the shelf board 3.

  As described above, the lock driving device 10 is configured not to protrude downward from the shelf 3 so as not to use the configuration corresponding to the substrate storage portion 200a in the portion (solenoid storage portion 100b) located in the space 30b. There is also a configuration divided into a plurality of drive units. Therefore, when attaching the key drive device 10 to the grand piano, the drive unit may be connected after the solenoid housing portion 100b is inserted into the space 30b in a state of being divided into a plurality of drive units. Therefore, even when the key driving device 10 is attached to the grand piano in which the key 20 is positioned above the leg girder 4, the leg girder 4 is not cut and removed, and the shape of the leg girder 4 is maintained. it can. Further, by not using a configuration corresponding to the substrate storage portion 200a below the solenoid storage portion 100c, the attachment position of the pedal lever 80 may not be greatly changed downward. In other words, the pedal lever 80 can be prevented from changing its attachment position before and after the key driving device 10 is attached, and can be kept in a slight movement even if it is necessary to change it.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention can be implemented in various aspects as follows.
[Modification 1]
In the above-described embodiment, in order to prevent the position of the pedal lever 80 from moving greatly downward, the lower part of the solenoid housing portion 100c in the drive units 10-L and 10-U corresponds to the substrate housing portion 200a. Although it did not have a configuration, when the position of the pedal lever 80 may be moved downward, a configuration corresponding to the substrate storage portion 200a may exist below the solenoid storage portion 100c.

  FIG. 13 is a diagram illustrating the configuration of the lock driving device 10A according to the first modification of the present invention. FIG. 13A is a view of the lock driving device 10A as viewed from above. FIG. 13B is a diagram of the key drive device 10A as viewed from the front of the automatic performance piano (the same direction as FIG. 4). In the key drive device 10A in this example, the solenoid housing portion 100c in the embodiment does not exist, and the solenoid housing portion 100Aa in which the substrate housing portion 200Aa exists in the lower part of the drive units 10A-L and 10A-U is the boundary portion P. It has spread. In this case, the connecting part 300 may be attached to the lower part of the substrate storage part 200Aa, for example. The solenoid housing portion 100Ab has the same configuration as the solenoid housing portion 100b in the embodiment.

[Modification 2]
In the above-described embodiment, the substrate storage portion 200a is configured to protrude downward from the shelf board 3, but may be configured to hardly protrude. An example of the configuration in this case will be described with reference to FIGS.

FIG. 14 is a diagram illustrating the configuration of the lock driving device 10B according to the second modification of the present invention. FIG. 14A is a view of the lock driving device 10B as viewed from above. FIG. 14B is a diagram of the key driving device 10B as viewed from the front of the automatic performance piano (the same direction as FIG. 4). 15 is a cross-sectional view of the key drive device 10B as viewed from the direction of arrows XV-XV shown in FIG.
As shown in FIGS. 14 and 15, the substrate storage unit 200Ba in the drive units 10B-L and 10B-U is not configured below the solenoid storage unit 100a like the substrate storage unit 200a in the embodiment. It is configured to extend in the horizontal direction from the side surface, particularly in the short direction (horizontal short direction) of the long drive units 10B-L and 10B-U. The substrate storage unit 200Ba may be configured to extend in both the vertical direction and the horizontal short direction depending on the size of the storage.
The opening 400 in contact with the shelf board 3 is provided in the lower part of the substrate storage part 200Ba. Therefore, not only the solenoid housing portions 100Ba, 100Bb, and 100Bc in the key driving device 10B but also the substrate housing portion 200Ba is inserted into the space 30 of the shelf board 3. The space 30 of the shelf board 3 may be configured to have a rectangular parallelepiped shape with a large volume as in the embodiment, or a shape along the outer shape of the solenoid housing portions 100Ba, 100Bb, 100Bc and the substrate housing portion 200Ba. May be configured.

[Modification 3]
In the embodiment described above, the automatic performance piano 1 has a configuration in which the key driving device 10 is attached to the grand piano, but is attached to a keyboard instrument other than the grand piano, for example, an acoustic instrument such as a harpsichord, an electronic piano, or the like. It may be done. That is, any keyboard instrument having a configuration in which a part of the keyboard 2 is positioned above the leg girder 4 is configured as an automatic performance piano by attaching the key driving device 10 to any keyboard instrument. be able to. The part of the keyboard 2 is not necessarily limited to both ends, but may be one end, and does not necessarily include the highest tone or lowest tone key 20. For example, the case where the leg girder 4 is located below the third to sixth keys 20 from the lowest note is included.

[Modification 4]
In the embodiment described above, when the key driving device 10 is attached to the grand piano, the leg girder 4 and the solenoid housing part 100b are not in contact with each other, but the lower part of the solenoid housing part 100b and the leg girder 4 are not in contact with each other. As a configuration in contact with the upper surface, the leg girder 4 may support the drive units 10-L and 10-U. In this case, the configuration may be such that the lower portion of the solenoid housing portion 100b is enlarged to the extent that the lower portion of the solenoid housing portion 100b contacts the upper surface of the leg girder 4. If it does in this way, a part of load concerning shelf board 3 at the time of fixing drive units 10-L and 10-U can also be distributed to leg girder 4. In this case, the driving units 10-L and 10-U may be fixed to the shelf plate 3 without screws, such as screws.
That is, in the configuration of the above-described embodiment, the drive units 10-L and 10-U are fixed to the shelf board 3 by the screws 15, and the shelf board 3 receives weight and reaction force and is positioned front and rear and left and right. The drive units 10-L and 10-U were supported. On the other hand, in this modified example, the leg girder 4 receives the weight and reaction force of the drive units 10-L, 10-U, so that the drive units 10-L, 10-U are secured by screws to the shelf plate 3 or the like. Positioning in the front-rear and left-right directions may be performed and attached to the grand piano.

[Modification 5]
In the embodiment described above, the lock driving device 10 is divided into two drive units, but may be divided into three or more. Even in such a case, for the drive unit having the solenoid 101 that drives the key 20 located on both ends of the key drive device 10 and above the leg girder 4, the substrate storage portion 200a is provided in the lower part in the embodiment. What is necessary is just to set it as the structure which the solenoid accommodating part 100b which does not have exists. On the other hand, the drive unit that is not located at both ends only needs to be configured so that both ends can be connected to other adjacent drive units, and a configuration corresponding to the substrate storage portion 200a exists at both ends of the drive unit. May be. Furthermore, the connection may be made via a control unit provided outside the drive unit.

[Modification 6]
In the above-described embodiment, the drive unit 10-L and the drive unit 10-U adjacent to each other are connected by the connecting part 300, but the drive unit 10-L and the drive unit 10-U are fixed to the shelf plate 3. Therefore, as long as they are not re-separated from each other, the connecting portion 300 is not necessarily required. Moreover, the structure corresponded to the connection part 300 may be provided in at least one of drive unit 10-L, 10-U.
On the other hand, when the connection part 300 exists, you may make it have functions other than connecting drive unit 10-L, 10-U. For example, since the pedal lever 80 is positioned in the vicinity of the position of the connecting portion 300, the connecting portion 300 may be configured to be able to attach a component or the like that supports the pedal lever 80. The structure to which components were attached may be sufficient. Further, the connecting part 300 may have a configuration corresponding to the controller 11.

[Modification 7]
In the embodiment described above, similarly to the substrate storage unit 200a, the solenoid storage unit 100 may be provided with a hole through which cooling air can pass.

[Modification 8]
In the above-described embodiment, the shelf plate 3 around the space 30 may be provided with reinforcing parts such as a metal plate to improve the strength.

[Modification 9]
In the embodiment described above, the pedal lever 80 is configured to be positioned in the vicinity of the boundary portion P of the drive units 10-L and 10-U. However, the boundary portion P is not necessarily positioned in the vicinity of the pedal lever 80. It does not have to be. For example, when the drive unit 10-L is longer than the drive unit 10-U and the pedal lever 80 is positioned below the drive unit 10-L, the substrate storage unit 200a is located near the pedal lever 80 in the vicinity of the solenoid storage unit 100. You may comprise so that it may not be located in the lower part.

DESCRIPTION OF SYMBOLS 1 ... Automatic performance piano, 2 ... Keyboard, 3 ... Shelf board, 4 ... Leg girder, 5 ... Leg part, 6 ... Action mechanism, 7 ... Balance pin, 8 ... Pedal 10, 10A, 10B ... Key drive device, 10 -L, 10A-L, 10B-L, 10-U, 10A-U, 10B-U ... drive unit, 11 ... controller, 15 ... screw, 20 ... key, 30, 30a, 30b ... space, 80 ... pedal lever 100, 100a, 100Aa, 100Ba, 100b, 100Ab, 100Bb, 100c, 100Bc ... Solenoid housing, 101 ... Solenoid, 110 ... Plunger head, 120 ... Plunger, 130 ... Coil, 200a, 200Aa, 200Ba ... Substrate housing, 210: substrate, 300: connecting portion, 400: opening

Claims (2)

A key driving device that is attached to a keyboard musical instrument configured such that a part of the keyboard is positioned above the leg girder via a shelf board and drives a plurality of keys constituting the keyboard in response to an input control signal Because
A plurality of actuators for driving each of the keys, and a control circuit for controlling the operation of the plurality of actuators according to the control signal, are penetrated in the vertical direction configured by removing a part of the shelf board A plurality of long drive units inserted into the removal space and attached to the keyboard instrument are provided,
The drive unit includes an actuator housing portion and a control circuit housing portion, and the actuator housing portion and the control circuit housing portion are arranged in a horizontal lateral direction of the drive unit.   2. The key drive device according to claim 1, wherein when the drive unit is attached to a keyboard instrument, the lower surface of the shelf plate and the lower surface of the key drive device form substantially the same surface. Key drive device.

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