JP2014153460A - Keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a rapid linking operation of a hammer and a key based on a drive signal by causing the key to easily follow a rotation operation of the hammer with respect to a forward direction.SOLUTION: A plunger contact part 25 of a key 20 has an absorbing property for a magnetic pole. An electromagnetic actuator 30 includes a displacement member 31 composed of a forward moving coil 38, a reciprocating coil 39, and a soft magnetic material. The displacement member 31 is interposed between the key 20 and a hammer and transmits a rotation force of both elements to each other. When a drive signal generated by a signal control part based on an automatic musical performance data is transmitted to a solenoid control driver and a drive current is supplied to the forward moving coil 38, an upward thrust is given to the displacement member 31 and the hammer is rotationally driven to the forward direction, and a magnetic pole is formed in a key contact part 35 of the displacement member 31 by a magnetic field generated by the forward moving coil 38, and a plunger contact part 25 is absorbed by the key contact part and a rotation to the forward direction of the key 20 is assisted.

Description

  The present invention relates to a keyboard instrument having a mechanism for driving a hammer in a forward direction by a drive signal using a member capable of contacting both a key and a hammer.

  2. Description of the Related Art Conventionally, a keyboard instrument is known that includes a member that abuts both a key and a hammer and transmits a load from one to the other. For example, in Patent Document 1 below, an electromagnetic actuator is disposed between a hammer and a key, and when a drive current flows through the coil of the electromagnetic actuator, the plunger moves up and down so that the reaction force against the key is reduced or increased. Composed. That is, the electromagnetic actuator is provided mainly for force sense control with respect to a key operation.

  Further, a permanent magnet is provided on the upper portion of the plunger, and an attracting member that is attracted to the permanent magnet is provided on the hammer shank. This makes it easy for the hammer to return quickly to the initial position when the key is released when the key is released.

JP 2011-8037 A

  However, in Patent Document 1, when the plunger rotates the hammer in the forward direction, the key only rotates in the forward direction due to the rotational moment due to its own weight. Therefore, when the movement of the plunger is fast, the key may not be able to follow the rotation of the hammer in the forward direction, and may rotate with a delay. In this case, for example, when a musical sound is generated by the operation of a hammer, the musical sound generation timing does not match the key movement, and the key movement looks unnatural especially in automatic performance.

  In addition, when a thrust is applied so that the rotation of the hammer is repeated repeatedly for the same pitch, if the key does not follow the hammer, both the hammer and the key may not be accurately rotated. As described above, there is a problem that it is difficult to realize a fast interlocking operation of the hammer and the key based on the drive signal.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to facilitate the key to follow the turning operation of the hammer in the forward direction, and to quickly link the hammer and the key based on the drive signal. An object of the present invention is to provide a keyboard instrument that can realize the operation.

  In order to achieve the above object, a keyboard instrument according to claim 1 of the present invention includes a rotatable key (20) having a first contact portion (25) having a property of being attracted to a magnetic pole, A hammer (HM) having two abutting portions (46) and rotatably provided corresponding to the key, and applying an inertial force to the operation of the corresponding key; and the first of the key A key abutting portion (35) capable of abutting and separating from the abutting portion, and a hammer abutting portion (42) capable of abutting and separating from the second abutting portion of the hammer. In the state of contacting the first contact portion and the second contact portion, the turning force in the forward direction of the key is transmitted to the hammer and the turning force in the backward direction of the hammer is transmitted. A displacement member (31) provided corresponding to the key so that it can be transmitted to the key and a thrust applied to the displacement member based on a drive signal Drive means (38) for driving the hammer in the forward direction through contact between the hammer contact portion and the second contact portion, and the hammer in the forward direction based on the drive signal by the drive means. And a magnetic pole forming means (38) for forming a magnetic pole at the key contact portion when a thrust for driving is applied to the displacement member.

  Preferably, the magnetic pole forming means forms a magnetic pole having a strength corresponding to the magnitude of the thrust applied to the displacement member.

  Preferably, the displacement member is a plunger (31) having the key abutting portion at an end, and the driving means is a solenoid coil (38) wound around the plunger, By supplying a drive current based on the drive signal, a thrust for driving the hammer in the forward direction is applied to the displacement member, and a magnetic pole is formed at the key contact portion.

  Preferably, at least one of the first contact portion and the key contact portion is provided with a sliding member (37) for reducing sliding friction with respect to the other.

  Preferably, the drive signal is generated based on automatic performance data for automatically operating the hammer.

  Preferably, it has a detection means (47) for detecting the operation of the hammer or the key, and further has a tone generation means (56) for generating a tone based on the detection result of the detection means.

  Preferably, it has a string (61) which is struck by the hammer and generates a musical sound.

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to the first aspect of the present invention, it is possible to make the key easily follow the turning operation of the hammer in the forward direction, and it is possible to realize a quick interlocking operation of the hammer and the key based on the drive signal.

  According to the second aspect, as the hammer rotates faster, the suction force can be increased and the followability of the key can be ensured.

  According to the third aspect, the configuration for thrust generation and magnetic pole formation is common and the configuration is simplified.

  According to the fourth aspect, smooth interlocking rotation of the hammer and the key can be realized.

It is the schematic sectional drawing and block diagram of the structure of those of the key of the keyboard musical instrument which concerns on one embodiment of this invention, a hammer, and those. It is an expanded sectional view of an electromagnetic actuator and its peripheral composition. It is sectional drawing of an electromagnetic actuator in the state where a displacement member exists in an initial position (figure (a)) and a lift end position (figure (b)). It is the figure which compared the locus | trajectory of the plunger contact part of the key at the time of performing the same pitch continuously according to automatic performance data with this Embodiment. It is an expanded sectional view (figure (a)) of an electromagnetic actuator in a keyboard instrument of a modification, and its peripheral composition, and a mimetic diagram (figure (b)) of a keyboard instrument of a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view and a block diagram of a configuration of a keyboard instrument, a hammer, and their surroundings according to an embodiment of the present invention.

  The keyboard instrument is configured as an automatic performance piano having a plurality of keys 20. A plurality of keys 20 are arranged in parallel in the left-right direction, and a hammer HM and an electromagnetic actuator 30 are provided corresponding to each key 20. Hereinafter, the player side (right side in FIG. 1) of the key 20 is referred to as “front”.

  FIG. 1 shows one key 20 and its peripheral components among a plurality of keys 20, and particularly shows a case where the key 20 is a white key. However, black keys and corresponding components are also shown. It has the same configuration.

  The key 20 is supported by a key fulcrum 11 on the shelf board 10 at an intermediate position in the front-rear direction. The key fulcrum 11 includes a fulcrum pin 21 erected on a balance rail extending along the arrangement direction of the keys 20, and the key 20 swings up and down with respect to the fulcrum pin 21. That is, the front end and the rear end of the key 20 can be rotated in the vertical direction around the key fulcrum 11, and can be rotated in accordance with the pressing / releasing key operation.

  On the shelf board 10, a key upper limit stopper 13 is installed below the rear end of the key 20, and a key lower limit stopper 12 is installed below the front end of the key 20. The center of gravity 22 of the key 20 is in front of the fulcrum pin 21. Accordingly, as the key 20 alone, the key 20 tends to rotate in the clockwise direction (forward direction) in FIG. 1 by its own weight. The key upper limit stopper 13 is in contact with the lower surface of the rear end of the key 20 that rotates in the backward direction, and regulates the non-key-pressing position (FIG. 1) of the key 20. On the other hand, the key lower limit stopper 12 abuts against the lower surface of the front end of the key 20 that rotates in the forward direction and regulates the key pressing end position of the key 20.

  A plunger abutting portion 25 (first abutting portion) made of a screw is provided at the upper end of the portion projecting from the upper half of the rear half of the key 20 behind the fulcrum pin 21. The plunger contact portion 25 has a property of being attracted to the magnetic pole and is made of a soft magnetic material such as iron.

  A hammer mounting base 14 is disposed on the shelf board 10 behind the fulcrum pin 21. The hammer mounting base 14 protrudes from between adjacent keys 20 directly above each key 20 at a rate of one for each of a plurality of key ranges. A hammer support portion 15 is disposed on the hammer mounting base 14. Reinforcing stays 16 are provided at the rear part of the hammer support portion 15 for every octave, for example.

  A hammer HM is rotatably supported on the hammer support portion 15 by a hammer fulcrum 26. The hammer HM is installed behind and above the key fulcrum 11. The hammer HM includes a straight bar-shaped shank portion 45 extending rearward from the hammer fulcrum 26 and a mass portion 48 having a predetermined mass attached to the tip of the shank portion 45. The shank portion 45 is rotatably supported by the hammer fulcrum 26 and is configured to rotate up and down within a vertical plane along the longitudinal direction of the key 20.

  Further, a hammer stopper support portion 17 is disposed on the hammer support portion 15. The hammer stopper support portion 17 is provided with a hammer upper limit stopper 19 and a hammer lower limit stopper 18. The hammer upper limit stopper 19 abuts against the shank portion 45 of the hammer HM that rotates in the forward direction and regulates the rotation end position of the hammer HM. The hammer lower limit stopper 18 abuts against the shank portion 45 of the hammer HM that rotates in the backward direction and regulates the initial rotation position (FIG. 1) of the hammer HM.

  When the displacement member 31 that is the plunger of the electromagnetic actuator 30 is in contact with the key 20 and the hammer HM, the rotation force of the key 20 in the forward direction is transmitted to the hammer HM and the rotation force of the hammer HM in the backward direction is transmitted. It is arranged so that it can be transmitted to the key 20. Accordingly, the hammer HM rotates in conjunction with the operation of the key 20 via the displacement member 31 and gives an inertial force to the operation of the corresponding key 20.

  Further, it is possible to perform automatic performance by driving the hammer HM in the forward direction by the electromagnetic actuator 30. Although details will be described later, in the automatic performance, the turning force of the key 20 in the forward direction is not dependent only on the weight of the key 20, but by the magnetic pole generated in the displacement member 31 when the hammer HM is driven in the forward direction. The key 20 is attracted and rotated in the forward direction. Further, it is possible to give the key 20 a sense of force for the performance operation by the cooperation of the inertia of the hammer HM and the electromagnetic actuator 30. The configuration and operation of these electromagnetic actuators 30 will be described in detail after FIG.

  The keyboard instrument includes a data fetch unit 51, a data write control unit 52, a data recording unit 53, a signal control unit 54, a solenoid control driver 55, and a musical tone generation unit 56 as control mechanisms. Although not shown, all or part of the functions of the data capturing unit 51, the data writing control unit 52, the data recording unit 53, the signal control unit 54, and the musical tone generation unit 56 are a CPU, RAM, ROM, timer, etc. Realized by collaboration. In addition to those shown in FIG. 1, for example, a communication interface for communicating with the outside and a mechanism for accessing an external recording device are provided.

  A hammer sensor 47 is provided corresponding to each hammer HM. The hammer sensor 47 is disposed at the position of the shank portion 45 when the hammer HM reaches the vicinity of the forward rotation end position. The hammer sensor 47 includes, for example, a photo interrupter including a light emitting unit and a light receiving unit that receives light from the light emitting unit and outputs a detection signal corresponding to the amount of received light, and a hammer HM that is fixed to the shank unit 45 according to the amount of rotation of the hammer HM. And a light shielding plate that changes the amount of light received by the light receiving unit. The hammer sensor 47 continuously detects the position of the hammer HM and outputs a detection signal corresponding to the detection result. A hammer roller 46 (second contact portion) is provided below the shank portion 45 of the hammer HM.

  The key sensor 23 is disposed below the front portion of the key 20, continuously detects the position of the key 20, and outputs a detection signal corresponding to the detection result. The configuration of the key sensor 23 is the same as that of the hammer sensor 47. Detection signals that are analog signals output from the key sensor 23 and the hammer sensor 47 are converted into digital signals by an A / D converter (not shown) and supplied to the data capturing unit 51.

  FIG. 2 is an enlarged cross-sectional view of the electromagnetic actuator 30 and its peripheral configuration.

  A support post 24 is fixed on the hammer mounting base 14, and a solenoid holding member 43 is fixed to the support post 24. The guide member 41 and the electromagnetic actuator 30 are fixed to the solenoid holding member 43 in the vertical direction. That is, the guide member 41 and the electromagnetic actuator 30 are positioned in order from the top between the hammer roller 46 and the plunger contact portion 25. A sensor holding member 49 is fixed to the front side of the guide member 41, and a plunger sensor 44 is disposed on the sensor holding member 49.

  The electromagnetic actuator 30 is a bidirectional drive type actuator, and includes two solenoid coils, a forward coil 38 and a backward coil 39, which are arranged side by side in a coaxial manner, and an inner side of the forward coil 38 and the backward coil 39. And a single displacement member 31 inserted and inserted into the structure. A yoke 40 is provided on the outer periphery of the forward coil 38 and the backward coil 39 to surround them. The rear surface of the yoke 40 is fixed to the solenoid holding member 43.

  The displacement member 31 is a plunger made of a soft magnetic material such as iron or silicon steel, and has a body portion 32, and an upper rod 33 and a lower rod 34 that extend upward and downward from the body portion 32. Composed. The forward movement coil 38 and the backward movement coil 39 are wound around the body 32, and the displacement member 31 is reciprocated by being displaced in the vertical direction inside the coils 38, 39. The upper rod 33 is not necessarily made of a magnetic material.

  1 and 2, the displacement member 31 is in an initial position corresponding to the non-key pressing position. When a drive current is supplied to the forward coil 38, an upward thrust is applied to the body portion 32, and the displacement member 31 can rise. On the other hand, when a drive current is supplied to the return coil 39 when the displacement member 31 is positioned above the initial position, a downward thrust is applied to the body portion 32 and the displacement member 31 can be lowered.

  The upper rod 33 is inserted through the guide member 41, and the guide member 41 plays a role of guiding the upper rod 33 when the displacement member 31 moves up and down.

  A hammer contact portion 42 made of resin or the like is provided at the tip (upper end) of the upper rod 33 of the displacement member 31. The hammer contact portion 42 can be contacted and separated from the hammer roller 46, and the hammer roller 46 is in contact with the hammer contact portion 42 in a non-key-pressed state. A lower end 34 a of the lower rod 34 is a part of a key abutting portion 35 that can abut against and separate from the plunger abutting portion 25.

  The key abutting portion 35 includes a plunger cap 36 made of resin or the like, and the lower end 34 a of the lower rod 34 is inserted through the plunger cap 36. A sheet-like sliding member 37 made of, for example, ultrahigh molecular weight polyethylene is attached to the lower surface of the plunger cap 36 as a low friction material. The sliding member 37 may be composed of a laminate of a low friction material and a cushion material such as artificial leather, but is formed to be thin enough to transmit the magnetic force at the lower end 34a of the key contact portion 35 to the plunger contact portion 25. To do. In this case, a magnetic material such as a magnetic sheet mixed with a high-permeability material in a polymer material or a resin is used as the cushion material, so that the magnetic contact between the key contact portion 35 and the plunger contact portion 25 is achieved. The binding force may be increased.

  The plunger sensor 44 is, for example, a light reflection type sensor, and includes a light emitting unit and a light receiving unit that receives light reflected by the reflecting material attached to the upper rod 33. The plunger sensor 44 continuously detects the position of the displacement member 31 and outputs a detection signal corresponding to the detection result. The detection signal is supplied to the signal control unit 54 (FIG. 1).

  In this keyboard instrument, “normal performance mode”, “performance recording mode”, “automatic performance mode”, and “force sense mode” can be selectively set as performance modes. In any mode, whether or not a musical sound is generated can be arbitrarily set. However, when a musical sound is generated, it is performed by the musical sound generator 56. The processing for generating a musical tone and the processing for controlling the electromagnetic actuator 30 will be described with reference to FIG.

  First, in the normal performance mode, the displacement member 31 is merely interposed between the hammer HM and the key 20 in a state of being freely movable in the vertical direction without using the electromagnetic actuator 30 electromagnetically. Therefore, when the key is depressed, the turning force of the key 20 in the forward direction is transmitted to the hammer HM via the displacement member 31, and the hammer HM rotates in the forward direction. When the key is released, the turning force of the hammer HM in the backward direction is transmitted to the key 20 via the displacement member 31, and the key 20 rotates in the backward direction.

  When the hammer HM rotates, the detection signal of the hammer sensor 47 is supplied to the musical sound generating unit 56 via the data capturing unit 51. The tone generator 56 includes a sound source circuit, an effect circuit, and a sound system, and converts an input detection signal into sound through conversion to a tone signal. Instead of the hammer sensor 47, a detection signal of the key sensor 23 may be used.

  In the performance recording mode, the hammer sensor 47 sequentially detects the movement of the hammer HM that is rotated by the player's performance operation of the key 20, and the detection signal of the hammer sensor 47 is sent to the data writing control unit 52 via the data capturing unit 51. To MIDI data. A series of MIDI data is recorded in the data recording unit 53 as one piece of automatic performance data. This automatic performance data can be used for playback on the keyboard instrument, but it can be taken out and used for playback of the automatic operation of the hammer with other keyboard instruments.

  In the automatic performance mode, the hammer HM is driven by the electromagnetic actuator 30 based on the automatic performance data recorded in the data recording unit 53. The automatic performance data used in the automatic performance mode may be input in real time via a communication interface.

  The signal control unit 54 generates a drive signal for driving the electromagnetic actuator 30 based on the detection signal indicating the position of the displacement member 31 supplied from the plunger sensor 44 and the automatic performance data, and outputs the drive signal to the solenoid control driver. Send to 55. The solenoid control driver 55 supplies a drive current corresponding to the sent drive signal to the forward coil 38 of the electromagnetic actuator 30 while referring to a solenoid control table stored in a storage unit (not shown). This drive current is a PWM signal that has been subjected to pulse width modulation so as to have a duty ratio corresponding to the target value of the average current to be passed through the forward coil 38.

  As a result, an upward thrust according to the strength of the drive current is applied to the displacement member 31 according to the note-on signal (drive means), and the displacement member 31 is raised. Then, the hammer roller 46 is driven by the hammer contact portion 42 of the displacement member 31, and the hammer HM is rotationally driven in the forward direction. The operation at this time will be further described with reference to FIG.

  3A and 3B are cross-sectional views of the electromagnetic actuator 30 in a state where the displacement member 31 is at the initial position and the lift end position, respectively. In the non-key-pressed state, as shown in FIG. 3A, the displacement member 31 is urged downward by the weight of the hammer HM, and the key contact part 35 is in contact with the plunger contact part 25. The hammer HM, the displacement member 31 and the key 20 are all located at the initial position.

  When the forward coil 38 is energized, the displacement member 31 is magnetized by the magnetic field generated by the forward coil 38 and magnetic poles are generated at both ends of the displacement member 31 (magnetic pole forming means). The strength of the magnetic pole depends on the strength of the drive current. When a magnetic pole is formed at the lower end 34 a of the lower rod 34 of the displacement member 31, the plunger contact portion 25 that is close to the slide member 37 is also magnetized, and the key contact portion 35 and the plunger contact portion 25 are Are magnetically coupled. That is, the plunger contact portion 25 is attracted to the key contact portion 35.

  Therefore, as the displacement member 31 moves up, the key 20 rotates in its forward direction due to its own weight, and in addition, the biasing force in the forward direction is generated by the magnetic attraction force of the plunger contact portion 25 against the key contact portion 35. The key 20 follows the hammer HM quickly. At that time, since the sliding member 37 is made of a low friction material, the friction with the plunger abutting portion 25 is small, and smooth follow-up is possible.

  Thus, when a thrust for driving the hammer HM in the forward direction is applied to the displacement member 31 based on the drive signal, a magnetic pole is formed in the key abutting portion 35, and the strength of the magnetic pole also depends on the thrust of the displacement member 31. Since it is approximately proportional, the key 20 accurately follows the fast rotation of the hammer HM. When the shank portion 45 of the hammer HM comes into contact with the hammer upper limit stopper 19, after a slight rebound, the hammer HM and the key 20 stop at the rotation end position and at the same time the displacement member 31 stops at the lift end position.

  On the other hand, when the drive current to the forward coil 38 is stopped according to the note-off signal based on the automatic performance data in the key-pressed state, the displacement member 31 loses the upward thrust. Then, when the hammer HM and the key 20 are rotated in the backward direction by their own weight, the displacement member 31 is also lowered to the initial position, and returns to the non-key-pressed state shown in FIG.

  Note that a downward thrust may be applied to the displacement member 31 by supplying a drive current to the return coil 39 in accordance with the note-off signal, so that the hammer HM, the key 20 and the displacement member 31 are restored. Can be further accelerated.

  In this automatic performance mode, musical tone generation is not essential, but the processing for generating musical tone is the same as in the normal performance mode. That is, based on a detection signal that is a result of detecting the operation of the automatically driven hammer HM by the hammer sensor 47, sound is generated in the musical sound generating unit 56 via the data capturing unit 51. Alternatively, the detection signal of the key sensor 23 may be used instead of the hammer sensor 47.

  Alternatively, a musical sound signal supplied to the musical sound generator 56 may be generated from automatic performance data. For example, based on the automatic performance data input from the data recording unit 53, the signal control unit 54 generates a musical sound signal in parallel with the generation of a drive signal for driving the electromagnetic actuator 30. In parallel with the solenoid control driver 55 supplying the drive current based on the drive signal to the forward movement coil 38, the signal control unit 54 supplies the tone signal to the tone generation unit 56.

  FIG. 4 is a diagram comparing the trajectory of the plunger abutting portion 25 of the key 20 when the same pitch is repeatedly struck according to the automatic performance data between the conventional and the present embodiment.

  In the example shown in FIG. 4, an upward thrust F <b> 1 is applied to the displacement member 31 according to the note-on signal, and a downward thrust F <b> 2 is applied to the displacement member 31 according to the note-off signal. For both the thrust and the locus, the solid line indicates an example of the present embodiment.

  In order to perform accurate repeated hitting, it is necessary to use automatic performance data such that the next note-on signal is output after the key 20 has completely returned to the initial position. Consider automatic performance data that can be repeated as fast as possible within the range of accurate repeated hits. Since the operation of the key 20 in the forward direction is faster in the present embodiment than in the prior art, the shortest time from the end of the period in which the upward thrust F1 is applied to the displacement member 31 until the next upward thrust F1 is applied. It is possible to set a short time interval. Therefore, in consideration of the margin, as illustrated by a solid line in FIG. 4, the shortest generation interval of the upward thrust F1 is shortened, and as a result, the maximum value of the drive frequency possible for the key 20 is increased.

  By the way, although details are not described about force sense control, as described in the above-mentioned patent document 1, using a force sense imparting table or the like, while monitoring the detection position of the key 20 or the displacement member 31, the forward movement coil 38 and By supplying a drive current to the return coil 39, the displacement member 31 is urged bi-directionally, and the assist of the key pressing force and the increase / decrease control of the key pressing reaction force can be controlled.

  According to the present embodiment, the magnetic pole is formed in the key contact portion 35 when the thrust for driving the hammer HM in the forward direction is applied to the displacement member 31 based on the drive signal. The plunger abutting portion 25 is attracted to 35, and the rotation of the key 20 in the forward direction is assisted. Therefore, the key 20 can be made to easily follow the turning operation of the hammer HM in the forward direction, and a quick interlocking operation of the hammer HM and the key 20 based on the drive signal can be realized.

  In particular, since a magnetic pole having a strength corresponding to the magnitude of the thrust applied to the displacement member 31 is formed in the key abutting portion 35, the attracting force of the plunger abutting portion 25 increases as the hammer HM rotates faster. Thus, the followability of the key 20 can be ensured.

  In addition, a thrust for driving the hammer HM in the forward direction is given to the displacement member 31 and the key abutting portion 35 is supplied by a single process in which a drive current based on the drive signal is supplied to the forward movement coil 38. Since the magnetic pole is formed, the configuration for thrust generation and magnetic pole formation is common and the configuration is simplified.

  Moreover, since the sliding member 37 is provided in the key contact part 35, smooth interlocking rotation of the hammer HM and the key 20 is realizable. From this viewpoint, the member for reducing the sliding friction may be provided on at least one of the key contact portion 35 or the plunger contact portion 25.

  Further, the key abutting portion 35 and the plunger abutting portion 25 do not need to be always coupled, and an attracting force is generated only when necessary, so that a jig or a configuration for coupling the key 20 and the displacement member 31 is used. Is also unnecessary and the structure is simple.

  In the present embodiment, the musical sound is generated electronically by the musical sound generator 56, but an acoustic sound may be generated. FIG. 5A is an enlarged cross-sectional view of the electromagnetic actuator 30 and its peripheral configuration in a keyboard instrument of a modified example.

  As shown in FIG. 5, the hammer upper limit stopper 19 is eliminated, and a string 61 that is hit by the mass portion 48 is provided above the hammer HM. Further, a back check mechanism 62 and a damper mechanism unit 63 are provided. In this case, the hammer sensor 47 and the key sensor 23 may be eliminated as long as the musical sound is ensured.

  In the present embodiment, the hammer HM is arranged above the key 20, but the present invention is not limited to this. For example, as shown in a schematic diagram of a keyboard instrument of a modified example in FIG. 5B, a hammer HM that rotates about a hammer fulcrum 65 is disposed below the key 20 that rotates about a key fulcrum 64. . The electromagnetic actuator 30 is disposed below the key 20 and above the hammer HM.

  In the present embodiment, the forward coil 38 functions as a driving unit that applies upward thrust to the displacement member 31 and as a magnetic pole forming unit that forms a magnetic pole on the key abutting portion 35 of the displacement member 31. It was a configuration that also served as a function. However, the driving means and the magnetic pole forming means may be configured separately.

  In this case, for example, the body portion 32 and the lower rod 34 are magnetically insulated, and a coil separate from the forward coil 38 is wound around the lower rod 34 so as to move integrally with the lower rod 34. Provide. Then, a driving signal for driving the hammer HM and a driving signal for forming a magnetic pole are generated from the automatic performance data, and an excitation current is supplied to the forward coil 38 and the separate coil in accordance with these signals. The data for driving the hammer HM and the data for forming the magnetic poles may be separate, or may be read out in synchronization with each other.

  Further, it is not essential that the driving means and the magnetic pole forming means are composed of solenoid coils.

  In addition, the data used as the origin for forming a magnetic pole in the key contact part 35 is not limited to the data grasped | ascertained as automatic performance data, and a format is also not limited. In particular, in a mode in which the hammer HM and the key 20 are not rotated and the hammer 20 and the key 20 are rotated together to make it appear as if it is being played visually, it is not necessary for the data to be used for automatic tone reproduction.

  HM hammer, 20 keys, 25 plunger contact portion (first contact portion), 30 electromagnetic actuator, 31 displacement member, 35 key contact portion, 37 sliding member, 38 forward coil (drive means, magnetic pole forming means) 42 hammer contact portion, 46 hammer roller (second contact portion), 47 hammer sensor (detection means), 56 musical sound generation portion (musical sound generation means), 61 string

Claims (7)

A rotatable key having a first abutting portion having a property of being attracted to a magnetic pole;
A hammer that has a second abutment portion, is rotatably provided corresponding to the key, and applies an inertial force to the operation of the corresponding key;
A key abutting portion capable of abutting and separating from the first abutting portion of the key, and a hammer abutting portion capable of abutting and separating from the second abutting portion of the hammer. In the state where the first contact portion and the second contact portion are in contact with each other, the turning force in the forward direction of the key is transmitted to the hammer and the turning force in the backward direction of the hammer. A displacement member provided corresponding to the key so that the key can be transmitted to the key;
Drive means for applying a thrust force to the displacement member based on a drive signal to drive the hammer in the forward direction via the contact between the hammer contact portion and the second contact portion;
And a magnetic pole forming means for forming a magnetic pole in the key abutting portion when a thrust for driving the hammer in the forward direction by the driving means is applied to the displacement member. Keyboard instrument to play.   The keyboard instrument according to claim 1, wherein the magnetic pole forming means forms a magnetic pole having a strength corresponding to a magnitude of a thrust applied to the displacement member.   The displacement member is a plunger having the key abutting portion at an end thereof, and the drive means is a solenoid coil wound around the plunger, and a drive current based on the drive signal is supplied to the solenoid coil 3. The keyboard instrument according to claim 1, wherein a thrust for driving the hammer in a forward direction is applied to the displacement member, and a magnetic pole is formed at the key abutting portion.   The sliding member for reducing the sliding friction with respect to the other is provided in at least one of the said 1st contact part and the said key contact part, The any one of Claims 1-3 characterized by the above-mentioned. Keyboard instrument.   The keyboard instrument according to claim 1, wherein the driving signal is generated based on automatic performance data for automatically operating the hammer.   6. The apparatus according to claim 1, further comprising a detection unit that detects an operation of the hammer or the key, and a musical tone generation unit that generates a musical tone based on a detection result of the detection unit. The keyboard instrument described.   The keyboard instrument according to claim 1, further comprising a string that is struck by the hammer to generate a musical sound.

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