JP2008233214A - Keyboard for automatic playing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce inaccuracy of key press driving due to manufacturing errors or changes due to aging. <P>SOLUTION: A hammer HM which rotates interlockingly with a key 10 is arranged corresponding to each key 10, and actuator 30 is provided corresponding to each hammer HM. A projection section 25 which is a projected driven section is projected downward, one at a front position and one at a rear position. In the actuator 30, a solenoid coil 32 is wound around a bobbin 31, and a plunger 33 is moved reciprotively inside the bobbin 31. A disk shape driver 34 is unitedly formed on an upper part of the plunger 33, and a top surface of the driver 34 is a flat surface 34a. When the actuator 3 drives the hammer HM, the flat surface 34a of the driver is abutted against an edge section 25a of the projection section 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automatic performance keyboard device in which a key is pressed by using a driving force of a driving means.

  2. Description of the Related Art Conventionally, there has been known an automatic performance keyboard device that realizes automatic performance by driving a key by using a driving force of a driving means to realize automatic performance (Patent Document 1 below).

In this apparatus, the keys are swingable around a key fulcrum, and one solenoid coil as a driving means is provided for each key. The solenoid coils are staggered in two rows along the key arrangement direction. The front end of the plunger provided inside each solenoid coil pushes up the lower surface of the rear end portion of the key from below so that the corresponding key is driven in the key pressing direction.
Utility Model Registration No. 2555777

  However, there may be a deviation between the position of the plunger and the position on the lower surface of the key rear end portion to be in contact with the plunger (driven position) due to component tolerance or mounting tolerance of the driving means itself. Further, the positional deviation between the two can also occur due to changes over time such as environmental changes after mounting.

  When the positional deviation occurs, the distance between the actual driven position actually contacting the plunger at the key rear end and the key fulcrum does not match the intended one. For this reason, even if the plunger operates with the designed stroke and driving force, the actual stroke of the key and the rotational moment received from the plunger are inappropriate.

  As a result, there is a problem in that accurate key-pushing drive cannot be performed, and depending on the degree, appropriate automatic performance becomes difficult.

  In addition, a hammer body for imparting inertia to the key is provided so as to swing in conjunction with the key, and the hammer body is driven by the driving means to indirectly press the key via the hammer body. A keyboard device that is driven is also known. Even in this apparatus, if there is a deviation between the position of the plunger and the position in the hammer body that should contact the plunger, there is a problem similar to the above.

  The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a keyboard device for automatic performance that can reduce inaccuracies in key pressing due to manufacturing errors and aging. There is.

  In order to achieve the above object, a keyboard device for automatic performance according to claim 1 of the present invention comprises a plurality of keys composed of a white key and a black key, which are swingably arranged in the direction of pressing and releasing keys, and each key. Corresponding to each of the hammer bodies, and a plurality of hammer bodies (HM) which are arranged in parallel in the key arrangement direction and swing in conjunction with the corresponding keys. A plurality of driving means (30) provided, and projecting driven parts (25, 125) projecting from the respective hammer bodies, and the corresponding hammer parts corresponding to each other by the driving parts of the driving means. When the projecting driven portion is driven, the corresponding key is configured to swing in the key pressing direction in conjunction with the corresponding hammer body, and the corresponding hammer among the driving portions of the driving means. When driving the projecting driven part of the body, the front end (25a, 125a) of the projecting driven part Portion (34a) which is characterized by being flat.

  In order to achieve the above object, an automatic performance keyboard device according to claim 2 of the present invention comprises a plurality of keys (10) each consisting of a white key and a black key, which are swingably arranged in the direction of pressing and releasing keys. A plurality of driving means (30) provided corresponding to each key, and having a driving section (34), and protruding from each key itself or a portion (39) fixed to each key. The corresponding driven key is driven in the key-pressing direction by driving the protruding driven portion of the corresponding key by the driving portion of the driving means. It is comprised so that it may rock | fluctuate, and when the said projecting driven part of the corresponding key is driven among the said driving parts of the said drive means, it contacts with the front-end | tip part (25a, 125a) of this projecting driven part. The portion (34a) is formed flat.

  Preferably, each of the driving means is disposed in any one of a first row and a second row passing through a first position and a second position in the longitudinal direction of the key and along the arrangement direction of the keys, The projecting driven parts corresponding to one key are projected one at a position corresponding to each of the first position and the second position, and two projecting driven parts corresponding to these one key. Of these, only the projecting driven parts corresponding to the rows in which the corresponding driving means are arranged are configured to be driven by the driving parts of the corresponding driving means.

  Preferably, the tip of the projecting driven portion has a shape that does not have a sharp corner at least in a portion of the driving means that contacts the driving portion.

  Preferably, the tip end portion (25a) of the projecting driven portion is an arc having a convex shape in at least a side view (Claim 5).

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

  According to the first and second aspects of the present invention, it is possible to widen the allowable range of the positional deviation of the driving means, and to reduce the inaccuracy of the key pressing drive due to the manufacturing error and the secular change.

  According to claim 3, a part of a group of parts such as a key and a hammer body on which a projecting driven part is projected can be made common in one keyboard device, and the number of parts of those parts is reduced. Can do.

  According to the fourth aspect, it is possible to improve the durability of the abutting portion between the driving portion of the driving means and the protruding driven portion.

  According to the fifth aspect of the present invention, in the entire key pressing drive process by the driving means, the smooth contact between the driving portion of the driving means and the protruding driven portion can be maintained, and the key pressing drive can be made more accurate. .

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

(First embodiment)
FIG. 1 is a sectional view of an automatic performance keyboard apparatus according to a first embodiment of the present invention.

  This keyboard apparatus is applied to, for example, an electronic keyboard instrument capable of automatic performance. The keyboard device is configured by supporting a plurality of keys 10 and a hammer body HM corresponding to each key 10 on a chassis 14. The key 10 is operated to be depressed, and is rotatable in the vertical direction around the key rotation fulcrum PK. As the key 10, there are a plurality of white keys 10W and black keys 10B. Hereinafter, the player side (left side in FIG. 1) of the keyboard apparatus is referred to as “front”. The key 10 is provided with a hammer body driving unit 11.

  Below each key 10, a hammer body HM is arranged corresponding to each key 10. Each hammer body HM is rotatable about each hammer body rotation axis PH. Further, the engaging portion 21 of the hammer body HM is always in engagement with the hammer body driving portion 11 of the key 10, so that the hammer body HM rotates in conjunction with the key 10. In response to the key pressing operation by the player, the engaging portion 21 is driven by the hammer body driving portion 11 of the key 10, and the hammer body HM is counterclockwise (corresponding to the key pressing direction) about the hammer body rotation axis PH. By rotating in the direction of movement), an appropriate inertia is imparted and a good key pressing feeling is obtained. The configuration of each key 10 and the configuration of each hammer body HM are the same.

  The length of the hammer body HM may be different for the white key 10W and the black key 10B. For example, the hammer body HM for the black key 10B is different from the hammer body HM for the white key 10W. Alternatively, the length of the front portion may be made longer than the hammer body rotation axis PH. In that case, the engaging part 21 and the hammer body driving part 11 of the black key 10B are located in front of the one corresponding to the white key 10W.

  In the hammer body HM, a mass member 23 is extended from the base 22 behind the hammer body rotation shaft PH. The hammer body HM is constantly urged clockwise by the weight of the mass member 23 (the direction corresponding to the key release direction) in the figure, and in the non-key-pressed state, which is the initial state, at the position indicated by HM-s. To position. Further, in the figure, the position of the hammer body HM corresponding to the key pressing state is indicated by HM-e, and the key 10 is shown only in the non-key pressing state. The returning force of the key 10 from the depressed state is due to the returning force of the hammer body HM due to the weight of the mass member 23. Also at the time of return, the hammer body HM rotates in conjunction with the corresponding key 10. Note that a return spring may be provided as auxiliary means for generating a return force for returning the hammer body HM to the non-key pressing position.

  An upper stopper 12 and a lower stopper 13 such as felt are provided on the rear upper part and the rear lower part of the chassis 14, respectively. The upper stopper 12 abuts against the mass member 23 of the hammer body HM when the key is pressed, and restricts the key pressing end position of the key 10. The lower stopper 13 abuts on the mass member 23 when the key is not pressed, and restricts the return position of the key 10 to the non-key pressed state.

  The keyboard device is provided with a 2-make key switch SW. The key switch SW is pressed by the switch pressing portion 24 of the hammer body HM, and detects a key operation including key velocity. In the case of a key pressing operation by a player, that is, a real-time performance, tone control is performed based on the detection result of the switch pressing unit 24.

  The keyboard device is also provided with an actuator 30 (30F, 30R) corresponding to each hammer body HM as a key driving means for automatic performance. All the actuators 30 are similarly configured except for the arrangement position.

  FIG. 2A is a plan view for one octave of a portion where the actuator 30 is disposed. FIG. 2B is a schematic diagram showing a key driving mechanism of the keyboard device.

  When the key 10 is distinguished from the white key and the black key, they are expressed as “white key 10W, black key 10B” as described above. However, when the key 10 is specified individually within one octave, FIG. As shown in a), numbers are assigned in order from the bass side, starting with the C key, and expressed as a key 10-1, a key 10-2,. For example, the C key that is the white key 10W is the key 10-1, and the C # key that is the black key 10B is the key 10-2. Similarly, when individually specifying the hammer body HM within one octave, the hammer bodies HM-1, HM-2,.

  The actuators 30 are arranged on a straight line in parallel in two rows of the front row (second row) and the back row (first row) along the key arrangement direction. Hereinafter, when the actuators 30 arranged in the front row and the rear row are roughly classified, those arranged in the front row are called the front actuator 30F, and those arranged in the rear row are called the rear actuator 30R. Similarly to the key 10 and the hammer body HM, when the actuators 30 in one octave are individually specified, the actuators 30-1, 30-2,.

  As shown in FIG. 1, each actuator 30 is configured such that a solenoid coil 32 is wound around a bobbin 31 so that a plunger 33 can reciprocate inside the bobbin 31. A disk-shaped drive unit 34 is integrally formed on the upper portion of the plunger 33, and the upper surface of the drive unit 34 is a flat surface 34a.

  As shown in FIGS. 1 and 2, a common yoke 36 common to all keys is fixed to the shelf plate 15. On the bottom portion 36 a (see FIG. 1) of the common yoke 36, an upper yoke 35 having a predetermined length (for example, a length corresponding to one octave) is fixed with a plurality of screws 37. Each actuator 30 is configured using the upper yoke 35 and the common yoke 36 as magnetic paths. The fixing with the screw 37 also serves to fix each actuator 30 between the upper yoke 35 and the common yoke 36. The configuration and arrangement of the actuator 30 are the same in other octaves.

  On the base portion 22 of the hammer body HM, a protruding portion 25 that is a protruding driven portion is provided so as to protrude downward at a front position (second position) and a rear position (first position). . As for the protrusion part 25, the thing of the front side is the protrusion part 25F, and the thing of the rear side is the protrusion part 25R, and both structures are the same. The base portion 22 is made of, for example, resin, and the protruding portion 25 is formed integrally with the base portion 22. However, the protruding portion 25 may be provided by being fixed to the base portion 22 as a separate configuration.

  The actuators 30F and 30R are respectively disposed substantially below the protrusions 25F and 25R of the corresponding hammer body HM. One actuator 30 corresponds to one hammer body HM. Accordingly, in the octave hammer body HM from the low sound side where the C key is the first in the octave, the protrusion 25R is actually driven by the actuator 30R, and the protrusion 25F is not used at all. On the other hand, in the even-numbered hammer body HM, the protrusion 25F is actually driven by the actuator 30F, and the protrusion 25R is not used at all.

  In the present embodiment, a configuration that does not perform key scaling of the key depression feeling is adopted. Therefore, the hammer bodies HM for the white key 10W and the hammer bodies HM for the black key 10B do not need to have different shapes and masses depending on the pitch. Therefore, there are only two types of hammer bodies HM for the white key 10W and the black key 10B. This is made possible by the fact that the projections 25 that are actually used among the two projections 25 provided in each hammer body HM are either one, although the actuators 30 are arranged in two rows. In addition, even if there are three or more types of hammer bodies HM, a plurality of hammer bodies HM can be shared. For example, the hammer body HM may be shared in a plurality of groups for each of the white key 10W and the black key 10B by performing key scaling for every predetermined area, for example, every octave.

  In the non-key-pressed state, the drive unit 34 of the plunger 33 is close to the protrusion 25 of the hammer body HM (one of the protrusions 25F and 25R located above the actuator 30). In the key pressed state, the drive unit 34 may be brought into contact with the protrusion 25. When the solenoid coil 32 is energized, the plunger 33 moves upward and pushes up the hammer body HM through the contact between the drive unit 34 and the projection 25. Then, in conjunction with the hammer body HM, the key 10 rotates in the key pressing direction (the direction in which the tip of the key 10 is displaced downward).

  When the energization is released, the plunger 33 is pushed by the hammer body HM through the protrusion 25 in conjunction with the return of the hammer body HM and the key 10, and in addition to the original initial position (shown in FIG. 1). Return to position. Note that a spring or the like for forcibly returning the plunger 33 may be provided to speed up the return operation.

  As shown in FIG. 2A, the actuators 30 are staggered in the front row and the rear row along the key arrangement direction. That is, in one octave, those corresponding to the odd-numbered keys 10 from the bass side are arranged in the rear row, and those corresponding to the even-numbered keys 10 are arranged in the front row. For example, the actuator 30-1 corresponding to the C key is arranged in the rear row, and the actuator 30-2 corresponding to the C # key is arranged in the front row.

  As shown in FIG. 2A, the arrangement interval (pitch) in the key arrangement direction of the keys 10 is not equal in the octave, but is wide for the C to E keys and narrow for the F to B keys. As for the hammer body HM, the one corresponding to the black key 10B is arranged substantially at the center of the black key 10B in the key arrangement direction, and the one corresponding to the white key 10W is a portion of the white key 10W adjacent to the black key 10B. Is arranged at approximately the center. Therefore, the arrangement intervals of the hammer bodies HM are not equal in the octave. As illustrated in part in FIG. 2A, hereinafter, the center interval between a pair of adjacent hammer bodies HM will be referred to as “hammer body interval pchH”. Further, the center distance between a pair of adjacent actuators 30 is referred to as “actuator distance pchA”.

  Here, the actuators 30 are not arranged directly below the corresponding hammer bodies HM, but the positions in the key arrangement direction are individually different from the corresponding hammer bodies HM. Specifically, in the example of FIG. 2, the actuators 30-1 to 30-5 are arranged close to the low sound side, and the actuators 30-5 to 30-12 are arranged close to the high sound side. For example, between the hammer bodies HM-1 and HM-2 corresponding to the C key and the C # key among the hammer body intervals pchH, the one between the actuators 30-1 and 30-2 among the actuator intervals pchA The direction is narrower.

  As a result, a wide region S1 is secured between the actuator 30-5 and the actuator 30-7 and between the actuator 30-4 and the actuator 30-6. And in this area | region S1, the said screw | thread 37 is screwed together. If the arrangement pattern of the actuators 30 in the key arrangement direction is the same as that of the hammer body HM as in the prior art, a sufficiently wide area cannot be obtained anywhere, and it is difficult to secure an appropriate place where the screw 37 is provided. However, the screws 37 can be arranged without difficulty by the arrangement of the present embodiment.

  Note that the position where the region S1 is provided is not limited to this example, and the area S1 can be provided at another position depending on the arrangement of the actuator 30. In addition, the component provided in the generated wide area is not limited to the one for fixing the actuator 30, but is a fixing tool for fixing the common yoke 36 to a fixed position with respect to the keyboard device such as the shelf board 15. There may be. Furthermore, the component is not limited to the fixing tool such as the screw 37, but is a separately provided component such as a fail-safe temperature sensor for monitoring a heat rise during power consumption with respect to energization of the solenoid coil 32, for example. It may be.

  Fig.3 (a) is a side view of the part in which the protrusion part 25 of the base 22 of the hammer body HM was provided, FIG.3 (b) is sectional drawing which follows the AA line of Fig.3 (a). FIG. 4 is a schematic diagram showing the configuration of the drive relationship from the actuator 30 to the key 1. FIG. 4 illustrates a drive system in which the protrusions 25 that are actually driven are the protrusions 25F in the front row.

  As shown in FIGS. 3A and 3B, the tip 25a, which is the lower end of the protrusion 25, is formed in a hemispherical shape. When the actuator 30 drives the hammer body HM, the flat surface 34a of the drive unit 34 comes into contact with the tip 25a of the projection 25. The interval between the flat surface 34a and the tip portion 25a in the non-key-pressed state is not limited to the interval as shown in FIG. 1, and may be very small or may be in contact. When the driven hammer body HM rotates, the protruding direction of the protrusion 25 changes relative to the flat surface 34a. However, since the tip end portion 25a is hemispherical, the change in the contact point between the tip end portion 25a and the flat surface 34a is smooth throughout the key pressing drive stroke, and the hammer body HM and thus the key 10 is driven accurately.

  Here, the flat surface 34 a is parallel to the upper surfaces of the shelf 15 and the bottom portion 36 a (see FIG. 1) of the common yoke 36. The operation direction of the plunger 33 is perpendicular to these. Strictly speaking, the position of the drive unit 34 of the actuator 30 may be deviated from the design position due to component tolerances of the actuator 30 itself or mounting tolerances of the actuator 30, the upper yoke 35, the common yoke 36, or the like. It is possible. Also, the deviation may occur due to a secular change such as an environmental change after mounting.

  However, since the protrusion 25 is driven by the flat surface 34a provided on the drive unit 34, as shown in an exaggerated manner in FIG. 4, even if the position of the drive unit 34 of the actuator 30 is slightly shifted back and forth, for example, The contact between the surface 34a and the tip 25a is ensured, the amount of vertical displacement of the protrusion 25 is constant, and the distance between the protrusion 25 and the hammer body rotation shaft PH is unchanged. Accordingly, the actual stroke of the key 10 to the hammer body HM and the rotational moment received from the drive unit 34 are maintained appropriately. Thereby, the tolerance | permissible_range of the position shift of the actuator 30 becomes substantially wide.

  The displacement of the actuator 30 is allowed not only in the front-rear direction but also in the key arrangement direction. Further, as described above, since there is a portion where the hammer body interval pchH and the actuator interval pchA do not coincide with each other, the center of the flat surface 34a of the drive unit 34 with respect to the protrusion 25 is shown in FIG. Some actuators 30 are out of position by design. However, even if the position is deviated, the hammer body HM receives the driving force from the protrusion 25 and the protrusion 25 protrudes at the center of the base 22 in the key arrangement direction. There is no effect on the rotational moment.

  FIG. 3C is a side view of a portion provided with a protrusion of the modified example of the base 22 of the hammer body HM, and FIG. 3D is a cross-sectional view taken along line BB in FIG. . As shown in FIGS. 3C and 3D, the tip 125a of the protrusion 125 is not hemispherical, but may be hemispherical when viewed from the side and horizontally when viewed from the rear (so-called wrinkles). Type). With this shape, the contact with the flat surface 34a is not a point contact but a line contact, so that the wear resistance is increased and the accuracy of the key pressing drive is maintained for a long time.

  In addition, the tip part shape of the projection parts 25 and 125 is not restricted to these illustrated examples. In particular, from the viewpoint of increasing the durability of the contact portion, it is only necessary that the tip portions of the protrusions 25 and 125 have a shape that does not have a sharp corner at the portion that contacts the flat surface 34a. For example, the side view shape may be a convex arc shape. Alternatively, as shown in FIG. 3 (e), the protrusion 25 has a flat portion 25b on the bottom surface, and at least the front and rear corners 25c connected to the flat portion 25b are rounded. There may be.

  FIG. 5A is a plan view for one octave showing a modification of the arrangement of the actuators 30 in the present embodiment. FIG. 5B is a schematic diagram showing a key driving mechanism in the modification.

  In the example shown in FIG. 5, the actuators 30-1 to 30-12 are arranged in a staggered manner and are arranged at equal intervals in the key arrangement direction. Accordingly, the front actuator 30F and the rear actuator 30R are also equally spaced. When the chassis 14 is made of resin, a plurality of ribs 38 extending in the front-rear direction for reinforcement may be provided as shown in FIG. The hammer body HM is disposed so as not to interfere with the rib 38 (see also FIG. 1). As described above, the hammer bodies HM themselves are not arranged at equal intervals, and a region having a wide interval and a region having a narrow interval are generated.

  However, in this modified example, the actuators 30 are arranged at equal intervals without being restricted by the arrangement pattern of the hammer bodies HM, so that the size of the actuators 30 is unified and the size of the actuators 30 themselves is maximized. Can be In the first place, the staggered arrangement of the actuators 30 allows the actuators 30 to be arranged efficiently, which is advantageous for increasing the size, but the maximum size can be increased by arranging at equal intervals.

  According to the present embodiment, the location where the hammer body interval pchH and the actuator interval pchA (see FIG. 2) do not match is provided in the same octave. It is possible to arrange (see FIG. 2), to adopt an equally spaced arrangement, to maximize the size of the actuator 30 itself (see FIG. 5), and to increase the degree of design freedom. In particular, in the example of FIG. 5, since the actuator 30 itself can be enlarged, the power efficiency is increased, which is advantageous for downsizing the power supply, and as a result, contributes to downsizing of the entire apparatus.

  Such an arrangement mode of the actuator 30 may be determined with some will, and the hammer body interval pchH and the actuator interval pchA may coincide with each other in some places. In the example of FIG. 5, there is a restriction that the rib 38 is avoided, but even if there is no such restriction, the effect of increasing the size can be obtained by arranging the actuators 30 at equal intervals.

  Further, according to the present embodiment, when the actuator 30 drives the hammer body HM, the flat surface 34a of the drive unit 34 comes into contact with the distal end portion 25a of the projection 25, so that the allowable range of displacement of the actuator 30 is allowed. The inaccuracies in the key pressing drive due to manufacturing errors and aging can be reduced.

  Further, since the tip 25a of the protrusion 25 is hemispherical, the smooth contact between the flat surface 34a and the tip 25a is maintained in the entire key pressing drive stroke by the actuator 30, and the key pressing is more accurately performed. Can be. Further, since the protruding portion 25 does not have a sharp corner at the portion that contacts the flat surface 34a of the driving portion 34, the durability of the contacting portion between the driving portion 34 and the protruding portion 25 can be improved.

  Each hammer body HM is provided with projections 25 at two positions corresponding to the two rows of actuators 30 and only the projections 25 corresponding to the rows where the corresponding actuators 30 are arranged are actually driven. Since it is configured as described above, a plurality of hammer bodies HM can be shared within a single keyboard device, and the number of types of hammer bodies HM can be reduced.

  From the viewpoint of increasing the degree of freedom in design, it is sufficient that there are at least one place where the hammer body interval pchH and the actuator interval pchA do not match.

(Second Embodiment)
FIG. 6A is a plan view of one octave portion of the portion where the actuator is provided in the automatic performance keyboard device according to the second embodiment of the present invention. FIG. 6B is a schematic diagram showing a key driving mechanism of the keyboard device.

  In the first embodiment, the keyboard device having the hammer body HM is exemplified. However, in the second embodiment, the key body 10 is directly driven by the actuator 30 without having the hammer body HM. Illustrate.

  As shown in FIG. 6B, the key 10 is rotatable up and down about the key rotation fulcrum PK2. The protrusions 25F and 25R provided on the hammer body HM in the first embodiment are provided on the lower surface of the rear end of the key 10 in the example of FIG. The actuators 30 are disposed below the protrusions 25, but their configurations are the same as those in the first embodiment, and the same is true in the two-row arrangement (see FIG. 6A). . Other configurations around the actuator 30 are the same as those in the first embodiment. As shown in an example in FIG. 6A, a center interval between a pair of adjacent keys 10 (a portion where the black key 10B is adjacent to the white key 10W (the narrow portion in the second half)) is expressed as “key interval. pchK ".

  In such a configuration as well, as in the example shown in FIG. 2, the arrangement pattern of the actuators 30 in the key arrangement direction is set so that a region S1 for screwing the screw 37 is secured. That is, the arrangement intervals of the keys 10 are not equal intervals within the octave, and the positions of the actuators 30 in the key arrangement direction are also individually different from the corresponding keys 10. Therefore, there is a portion where the key interval pchK and the actuator interval pchA do not match.

  FIG. 7 is a schematic diagram of the rear view of the rear end of the key 10-7 (F # black key 10B). In the key 10-7, the protrusion 25 protrudes at the center in the key arrangement direction. In the key arrangement direction, the center position of the flat surface 34a of the drive unit 34 is deviated by design with respect to the protrusion 25, but the key 10-7 is located at the tip 25a in the center of the key arrangement direction via the protrusion 25. Receives driving force. Therefore, the key 10-7 is driven appropriately without applying a force in the rolling direction.

  The same applies to the other black keys 10B. In addition, for the white key 10W, the protrusion 25 protrudes from the center in the key arrangement direction in the portion where the black key 10B is adjacent (the narrow portion in the second half).

  FIG. 8 is a plan view for one octave showing a modified example of the arrangement of the actuators 30 in the second embodiment. In the example shown in FIG. 8, the keys 10 are arranged at unequal intervals, but the actuators 30-1 to 30-12 have a staggered arrangement as in the example shown in FIG. They are arranged at equal intervals in the arrangement direction. That is, in this modified example, the actuators 30 are arranged at equal intervals without being restricted by the arrangement pattern of the keys 10, so that the size of the actuators 30 is unified and the size of the actuators 30 themselves is maximized. can do.

  According to the present embodiment, in the keyboard device in which the key is directly driven by the actuator 30, the degree of freedom in design such as providing an installation space for fixing tools and parts, or increasing the size of the actuator 30, and The same effects as those of the first embodiment can be obtained with respect to reducing the inaccuracy of the key depression drive due to the manufacturing error of the actuator 30 and the secular change.

  Further, even if the positions of the key 10 and the actuator 30 in the key arrangement direction are different from each other in design, the key 10 receives a driving force at the center in the key arrangement direction via the protrusion 25, so that the movement in the rolling direction is not caused. It is suppressed and an accurate key pressing operation can be realized and durability can be improved. If limited to this effect, the upper surface of the drive unit 34 is not limited to a flat surface.

  For the black key 10B, only the protrusions 25 corresponding to the row where the corresponding actuators 30 are arranged among the two protrusions 25 are actually driven. The number of types can be reduced by enabling common use in the keyboard device.

  Since the shape of the white key 10W is different for each key 10W, even if two protrusions 25 are provided, they cannot be shared immediately. However, as will be described below, in the inexpensive keyboard instrument close to a toy or the like, it is possible to reduce the types of the white keys 10W by collecting them.

  FIGS. 9A to 9C are plan views showing white keys when the types of white keys are reduced. As illustrated in FIGS. 4A to 4C, the types of the keys 10W are unified into three types, that is, a key 10W1, a key 10W2, and a key 10W3. Specifically, the key 10W1 is adopted as the C key and the F key, the key 10W2 is adopted as the D key, the G key, and the A key, and the key 10W3 is adopted as the E key and the B key. As a result, the number of types of the white key 10 can also be reduced.

  In the present embodiment, the configuration in which the key 10 is directly driven by the actuator 30 is illustrated. However, the present invention is not limited to this, and the present invention can be applied even when driven indirectly.

  For example, as shown in FIG. 9 (d), a separate member 39 is fixedly provided to the key 10 that is rotatable up and down around the key rotation fulcrum PK3. 39 is displaced together with the key 10. Then, two protrusions 25 are provided on the separate member 39. According to this configuration, the same effect as that of the second embodiment can be achieved in the keyboard device in which the key 10 is driven through the fixed separate member 39.

  Also in the present embodiment, the modification of the first embodiment (see FIGS. 3C, 3D, and 3E) may be applied to the shape of the protrusion 25.

  In the first and second embodiments, the key 10 and the hammer body HM are driven by the actuator 30 only if the degree of design freedom is increased by devising the arrangement of the actuators 30. It is only necessary to have a portion, and it is not necessary to have a protruding shape like the protruding portion 25. Further, even when the actuators 30 are arranged at equal intervals, the actuators 30 may be arranged at equal intervals rather than strictly at equal intervals. The smaller the interval difference, the more advantageous is the enlargement of the actuator 30.

  Furthermore, in the first and second embodiments, it is not essential to arrange the actuators 30 in two rows as long as the degree of freedom in design is increased by devising the arrangement of the actuators 30. Alternatively, it may be arranged in three or more rows.

  In the first and second embodiments, the two protrusions 25 are provided to reduce the types of the key 10 and the hammer body HM. However, when the effect of reducing the types is not necessary The protrusions 25 need only be provided at positions corresponding to the rows necessary for driving in each key 10 and the hammer body HM.

  Speaking only to reduce the types of keys 10 and hammer bodies HM by providing two or more protrusions 25, a plurality of actuators 30 may be provided so as to pass through positions corresponding to the protrusions 25. Well, it is not always necessary to have a two-row staggered arrangement.

  Also, when considering only the effect of widening the allowable range of positional deviation of the actuator 30 and reducing the inaccuracies in key pressing due to manufacturing errors and secular changes, there is only one protrusion 25. Just do it. Moreover, as far as obtaining this effect, the staggered arrangement is not essential for the arrangement of the actuators 30, and therefore the two-row arrangement is not essential.

  In the first and second embodiments, the actuator 30 using the solenoid coil 32 is illustrated as an example, but the actuator 30 is not limited thereto. For example, other driving means such as a motor and a piezo element may be employed.

  In the first and second embodiments, the case where the present keyboard device is applied to an electronic keyboard instrument keyboard without strings is illustrated, but the present invention is not limited to this. For example, it has strings, and in normal performances it is struck and used as an acoustic instrument, while in silent mode (silent mode), strings are forbidden and electronic musical sounds corresponding to key press operations are generated. The present invention can also be applied to various keyboard instruments.

It is sectional drawing of the keyboard device for automatic performances concerning the 1st Embodiment of this invention. FIG. 4 is a plan view (FIG. (A)) of one octave of a portion where an actuator is disposed, and a schematic diagram (FIG. (B)) showing a key driving mechanism of the keyboard device. It is a side view (figure (a)) of the part in which the projection part of the base of a hammer object was provided, and a sectional view (figure (b)) which meets an AA line of figure (a). It is a schematic diagram which shows the structure of the drive relationship from an actuator to a key. FIG. 6 is a plan view (FIG. (A)) for one octave showing a modification of the arrangement of actuators in the present embodiment, and a schematic diagram (FIG. (B)) showing a key driving mechanism in the modification. In the keyboard device for automatic performances according to the second embodiment of the present invention, a plan view (FIG. (A)) corresponding to one octave of the portion where the actuator is disposed, a schematic diagram showing the key drive mechanism of the keyboard device (Figure (b)). It is a schematic diagram of the rear view of the rear-end part of the black key of F #. It is a top view for 1 octave which shows the modification of arrangement | positioning of the actuator in 2nd Embodiment. Plan views (FIGS. (A) to (c)) showing white keys when the types of white keys are reduced, and a schematic diagram showing a modified example in which another member is fixedly provided to the keys (FIG. (D)) ).

Explanation of symbols

  10W White key, 10B Black key, 25, 125 Protruding part (protruding driven part), 25a, 125a Tip part, 30 Actuator (driving means), 34 Driving part, 34a Flat surface, 39 Separate member, HM hammer body

Claims (5)

A plurality of keys each consisting of a white key and a black key, each of which is swingable in the direction of pressing and releasing keys;
A plurality of hammer bodies that are arranged in parallel in the arrangement direction of the keys corresponding to the keys, and swing in conjunction with the corresponding keys;
A plurality of driving means provided corresponding to each of the hammer bodies;
A projecting driven portion projecting from each hammer body,
When the projecting driven portion of the corresponding hammer body is driven by the driving portion of the driving means, the corresponding key is configured to swing in the key pressing direction in conjunction with the corresponding hammer body. ,
Of the driving parts of the driving means, a portion that abuts against the tip of the projecting driven part when the projecting driven part of the corresponding hammer body is driven is formed flat. Automatic performance keyboard device. A plurality of keys each consisting of a white key and a black key, each of which is swingable in the direction of pressing and releasing keys;
A plurality of driving means provided corresponding to each of the keys;
Each key itself or a projecting driven part projecting from a fixed part with respect to each key;
The projecting driven portion of the corresponding key is driven by the driving unit of the driving means, and the corresponding key is configured to swing in the key pressing direction,
Of the driving parts of the driving means, a portion that comes into contact with the tip of the projecting driven part when the projecting driven part of the corresponding key is driven is formed flat. Keyboard device for performance.   Each of the driving means is arranged in one of the first and second rows passing through the first position and the second position in the longitudinal direction of the key and along the key arrangement direction, and The projecting driven parts corresponding to are projected one by one at positions corresponding to the first position and the second position, and of the two projecting driven parts corresponding to these one key, 3. The structure according to claim 1, wherein only the projecting driven parts corresponding to the rows in which the corresponding driving means are arranged are driven by the driving parts of the corresponding driving means. Keyboard device for automatic performance.   The tip end portion of the protruding driven portion has a shape that does not have a sharp corner at least in a portion that contacts the driving portion of the driving means. The keyboard device for automatic performance according to the item.   The keyboard device for automatic performance according to any one of claims 1 to 4, wherein at least a tip of the protruding driven portion has a convex arc shape in a side view.

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