JPH0625884U - Electronic musical instrument keyboard device - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is simple without increasing the number of parts and the number of assembling steps, which improves the hitting performance of the keys when playing and gives the performer a touch feeling very similar to that of an acoustic piano. It is possible to let. [Structure] A key 14 that is swingably disposed in a holder 12 that is fixedly installed in the keyboard frame 10 and a hammer 16 that is swingable in cooperation with the key 14 are provided. When the hammer 16 is rotated in response to a key operation, an elastic member 16e that acts to have an elastic force that urges the hammer 16 in a direction opposite to the rotation direction of the hammer 16 is supported as a swing center of the hammer 16. It is integrally provided near the shaft 16d.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a keyboard device for an electronic musical instrument, and more particularly to a keyboard device for an electronic musical instrument that allows a performer to obtain a touch feeling very similar to that of an acoustic piano when playing, and is excellent in key-pushability.

[0002]

[Prior art]

 A conventional keyboard device for an electronic musical instrument is disclosed in, for example, Japanese Patent Laid-Open No. 63-128397. FIG. 9 shows a keyboard device of an electronic musical instrument disclosed in the above-mentioned Japanese Patent Laid-Open No. 63-128397, in which a key 104 swingably supported by a pin 102 which is a key fulcrum portion provided on a keyboard frame 100. Is arranged below the key 104 along the key 104 and is swingably supported by a pin 106 which is a hammer fulcrum portion provided on the keyboard frame 100, and is interlocked with the swing of the key 104 when pressed. The hammer 108, which is rocked by the lever, is linked to the key 104 and the hammer 108. The key 104 and the hammer 108 are attached in the opposite directions with respect to the rotational directions of the key 104 and the hammer 108 when the key 104 is pressed. It has a leaf spring 110 which is an elastic member for urging. In the above configuration, when the key 104 is pushed down for the key depression operation, the hammer 108 interlocks with the key 104 and rotates in the same direction as the key 104. In this case, when the key 104 and the hammer 108 rotate, the leaf spring 110 elastically deforms so as to bias the key 104 and the hammer 108 in the direction opposite to the rotation direction of the key 104 and the hammer 108 in the key pressing operation. And stores elastic energy. Therefore, when the key 104 is released for the key releasing operation, the restoring force of the elastic energy of the leaf spring 110 causes the key 104 and the hammer 108 to move in the direction opposite to the direction of rotation by the key pressing operation. The keys 104 and the hammer 108 return to their initial positions (positions before key depression operation) by being urged and rotated. However, in the keyboard device of this kind of electronic musical instrument described above, the return of the key and the hammer to the initial position at the time of the key release operation is forced by the elastic energy based on the elastic deformation of the elastic member such as the leaf spring. Since it relies only on the dynamic restoring force, the touch feeling is different when comparing the return operation of the key and hammer to the initial position during key release operation, which is mainly performed by gravity. was there. Further, since the key and the hammer are linked by the elastic member such as the leaf spring, it is necessary to lock the elastic member such as the leaf spring to the keyboard frame, the key or the hammer when assembling the keyboard device. However, there is a problem that the assembly work is complicated and the man-hours for assembly are also increased.

Therefore, the applicant of the present invention has proposed a key release operation in Japanese Patent Application No. 62-271809 filed on Oct. 29, 1987 ((Japanese Patent Application Laid-Open No. 1-169494) hereinafter referred to as prior application). At times, the key and the hammer return to the initial position due to gravity, and when the key is pressed, the inner wall of the key and the hammer come into contact with each other to prevent the rebound of the hammer and the generation of noise, etc. A keyboard device was proposed. FIG. 10 shows a keyboard device for an electronic musical instrument disclosed in the prior application, which is swingable on a first protrusion 124 which is a first fulcrum portion provided on a keyboard holder 122 fixed to a keyboard frame 120. It has a supported key 126 and a hammer 130 swingably supported by a second protrusion 128 which is a second fulcrum portion provided on the keyboard holder 122. The hammer 130 is integrally formed of an alloy or synthetic resin having a high specific gravity in order to increase the moment of inertia, and is arranged so that the weight on the right side of the second protrusion 128 in FIG. 10 becomes heavy. A turning force based on the action of gravity due to its own weight imparts a habit of always returning (turning) in the clockwise (clockwise) direction shown by the arrow in FIG. The key 126 has a flat portion 132 located between the first protrusion 124 and the second protrusion 128 and formed on the left side of the second protrusion 128 of the hammer 130 in FIG. An actuator 134 adapted to be in contact with is hung vertically downward. In the above configuration, when the key 126 is pushed down for the key depression operation, the key 126 rotates clockwise around the first protrusion 124 which is the first fulcrum. Along with the rotation of the key 126, the actuator 134 presses the upper surface of the flat portion 132 of the hammer 130, and depresses it against the clockwise rotating force of the hammer 130 due to the gravity. It rotates in the counterclockwise direction about the second protrusion 128 which is the fulcrum of the center. Therefore, when the key 126 is released for the key release operation, the hammer 130 rotates clockwise around the second protrusion 128 due to the action of gravity due to the weight of the hammer 130, and the flat portion 132 causes the flat portion 132 to rotate. By pushing up the actuator 134, the key 126 and the hammer 130 are returned to the initial positions.

[0004]

[Problems to be solved by the device]

 In the electronic musical instrument keyboard apparatus according to the applicant's earlier application, the key and the hammer are returned to their initial positions only by the action of gravity based on the weight of the hammer. There was a problem that the return speed for returning to the position was slow, and the continuous hitability of the key was poor. The present invention has been made in view of the above problems of the conventional technology. The purpose of the present invention is to improve the continuous hitting of a key with a simple structure without increasing the number of parts and the number of assembly steps. It is intended to provide a keyboard device for an electronic musical instrument, which can be improved and can provide a touch feeling extremely close to that of an acoustic piano.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the keyboard device for an electronic musical instrument according to the present invention has a key swingably arranged on a keyboard base and a hammer swingably linked with the key. However, when the hammer rotates due to the key pressing operation, an elastic member that acts so as to have an elastic force that biases the hammer in the direction opposite to the rotation direction of the hammer is attached to the swinging shaft of the hammer. It is arranged integrally in the vicinity.

[0006]

[Action]

 When a key is depressed for a key depression operation, elastic energy due to elastic deformation is stored in an elastic member integrally provided on the hammer as the key is pushed. Therefore, when the key is released for the key release operation, the hammer is affected by the gravity due to the weight of the hammer and the elastic energy stored in this elastic member acts on the hammer, which causes the hammer to return to its initial position. Can be increased. Therefore, it is possible to increase the speed of returning the key, which is interlocked with the hammer, to the initial position.

[0007]

【Example】

 Hereinafter, a keyboard device for an electronic musical instrument according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a keyboard device for an electronic musical instrument according to the present invention. The keyboard device for an electronic musical instrument is a keyboard frame 10 attached to an electronic musical instrument main body such as an electronic piano or an electronic organ. And a holder 12 fixed to the upper surface of the keyboard frame 10 by a method such as screwing or adhering, and a key serving as a first fulcrum portion integrally protruding from one end of a base portion 12a of the holder 12. A key 14 that is swingably locked to a support shaft 12c of the bearing portion 12b and a U-shaped groove portion 12e of a hammer bearing portion 12d integrally formed at the other end of the base portion 12a of the holder 12 are swingable. And a hammer 16 locked to the.

The keyboard frame 10 has a base portion 10a and a box portion 10b connected to the base portion 10a. The base portion 10a is provided with slits 10c as many as the hammers 16, and the vertical wall portion 10d of the box portion 10b is also provided with slits 10e aligned with the slits 10c. Cushions 10i and 10j are provided on a lower surface 10f near the box portion 10b of the base portion 10a on which the holder 12 is located and an upper surface 10h of a bottom surface 10g of the box portion 10b. Felts 10k and 10l are provided on both upper and lower surfaces of the base portion 10a near the box portion 10b on the side opposite to the cushion 10i.

As shown in FIG. 4, the holder 12 is integrally formed of hard resin or the like, and as described above, one end of the base portion 12 a is integrally provided with the key bearing portions 12 b as many as the hammers 16. The key receiving shaft portion 12b also has a support shaft 12c protruding therefrom. A hammer bearing portion 12d is integrally projectingly provided at the other end of the base portion 12a to form a U-shaped groove portion 12e. Further, the base portion 12a is provided with a hole 12f extending from between the respective hammer bearing portions 12d in the direction of the key shaft portion 12b, and from the end portion 12g on the other end side, an extension aligned with the hole 12f. A stopper portion 12h is vertically provided on the upper side. As shown in FIG. 8, the positional relationship between the hole 12f and the stopper portion 12h and the slit 10c of the base portion 10a and the slit 10e of the vertical wall portion 10d is such that when the stopper portion 12h is fitted into the slit 10c, The hole 12f and the slit 10c are aligned and communicate with each other, and the hole 12f and the slit 10c and the slit 10e are aligned on the same plane.

The key 14 has a substantially U-shaped cross section, and is hollow inside. A friction engagement portion 14b that abuts the hammer 16 is formed on the inner surface 14a of the key 14, and an actuator 14c that swings the hammer 16 is provided in a protruding manner. The rear end 14d of the key 14 is provided with a pair of support shaft holes 14e into which the support shaft 12c is fitted and which serves as a swing center which is a fulcrum of the key 14. Further, a protrusion 14g and a notch 14h are formed on the front end 14f of the key 14. When the key is not pressed, the protrusion 14g contacts with the felt 101 disposed on the lower surface of the base 10a, and the notch 14h is provided when the key pressing operation is completed. It contacts the felt 10k arranged on the upper surface of 10a to regulate the swing range of the key 14.

The hammer 16 is formed of an elastic synthetic resin such as polyacetal, and the tip portion 16b of the arm portion 16a located at the front end portion of the hammer 16 has a mass portion 16c made of an alloy having a high specific gravity. Is enclosed. A support shaft 16d is provided at the center of swing of the hammer 16, and the support shaft 16d is fitted into the U-shaped groove portion 12e of the holder 12 so that the hammer 16 is attached to the holder 12. Is swingable. Further, in the vicinity of the support shaft 16d on the lower surface of the hammer 16 on the side of the mass portion 16c (the lower surface of the hammer 16 on the left side of the support shaft 16d in FIG. 1), a tongue-shaped elastic member 16e is integrally formed downward. It has been extended. The elastic member 16e comes into contact with the stopper portion 12h of the holder 12 and elastically deforms when the hammer 16 is rotated by pressing the key 14. On the other hand, in the vicinity of the spindle 16d on the upper surface of the hammer 16 on the side opposite to the mass portion 16c (the upper surface of the hammer 16 on the right side of the spindle 16d in FIG. 1), a flat portion 16f that contacts the actuator 14c is formed. Although the upper portion of the U-shaped groove portion 12e is open, even if the support shaft 16d moves upward in the U-shaped groove portion 12e due to an impact or the like, the flat portion 16f on the rear side of the hammer 16 does not move to the actuator 14c. The movement is regulated by abutting against the cushion 16 and the movement of the arm 16a on the front side of the hammer 16 is regulated by abutting against the cushion 10j. Further, the depth of the U-shaped groove 12e is sufficiently deep. Therefore, the support shaft 16d does not come off from the U-shaped groove portion 12e. Further, as described above, since the center of gravity of the hammer 16 is located on the front side of the support shaft 16d which is the center of swing, the hammer 16 causes the hammer 16 to support the support shaft 16d which is the center of swing. A biasing force, which is always rotated counterclockwise as indicated by an arrow in Fig. 1, is applied. For this reason, the key 14 is constantly pushed upward through the actuator 14c that comes into contact with the flat portion 16f, and is urged so as to return to the state where it is not always depressed (initial state). Further, the upper portion 16g of the hammer 16 is provided with an elastic protrusion for abutting against the friction engaging portion 14b of the key 14 to absorb the impact when the key pressing operation is completed and the hammer 16 is completely rotated. The elastic projection 18 is provided with a plurality of (three in this embodiment) projections 18a, 18b, 18c having different elastic forces, which are made of rubber or elastomer. It is formed by. The protrusion 18a as the first impact energy absorbing portion is formed of a member having a stronger elastic force than the protrusion 18b as the second impact energy absorbing portion, and the protrusion 18b as the second impact energy absorbing portion is It is formed of a member having a stronger elastic force than the protrusion 18c serving as the third impact energy absorbing portion. Therefore, when the elastic projection 18 abuts on the friction engagement portion 14b, the projection 18a having a strong elastic force first receives the shock and the shock is absorbed. Since it is configured to be received by the 18b and the protrusion 18c, the impact is efficiently absorbed.

Reference numeral 20 is a switch provided to generate a musical sound from the electronic musical instrument in response to a key depression operation of the key 14.

In the above structure, as shown in FIG. 8, the stopper portion 12h of the holder 12 is fitted into the slit 10c of the keyboard frame 12 so that the hole 12f and the slit 10c are aligned with each other. The holder 12 is fixed to the upper surface of the frame 10 by a method such as screwing or bonding. Then, the arm portion 16a is inserted into the hole 12f of the holder 12 and the slits 10c and 10e of the keyboard frame 12, and the support shaft 16d is fitted into the U-shaped groove portion 12e. Then, the support shaft 12c of the key bearing portion 12b of the holder 12 is fitted into the support shaft hole 14e, and the key 14 is swingably attached.

As shown in FIGS. 2 and 7, when the key 14 is pushed down in order to press the key 14, the key 14 rotates counterclockwise about the support shaft 12c. With the rotation of the key 14, the actuator 14c integrally attached to the key 14 presses the flat portion 16f of the hammer 16 to generate a counterclockwise rotational force due to the action of gravity due to the weight of the hammer 16. It is pushed down against this, and the hammer 16 is rotated about the support shaft 16d in the opposite direction (clockwise direction) to the rotation direction (counterclockwise direction) due to the depression of the key 14. When the hammer 16 rotates clockwise, the elastic protrusion 18 contacts the frictional engagement portion 14b of the key 14, and the upper surface of the arm 16a contacts the cushion 10i to restrict the rotation. The rotation of the hammer 16 is completed. It has been empirically confirmed that the cushion 10i alone is not sufficient to suppress the impact and the invasion when the hammer 16 is completely rotated. Is in contact with the friction engagement portion 14b of the key 14 to absorb the impact. Since the elastic protrusion 18 is composed of the plurality of protrusions 18a, 18b, 18c having different elastic forces, the impact can be effectively absorbed when the key is strongly pressed or pressed. That is, when the elastic protrusion 18 contacts the frictional contact portion 14b, the impact is first received by the protrusion 18a having the strongest elastic force, and the initial large impact is absorbed and weakened. The weakened impact is received by the projection 18b and weakened, and the weakened impact by the projection 18b is received by the projection 18c. In this way, a large impact is absorbed by gradually reducing the impact force, so that the impact is efficiently absorbed.

Further, as shown in FIGS. 6 and 7, with the rotation of the hammer 16 by the key pressing operation, the elastic member 16e comes into contact with the stopper portion 12h to prevent the rotation. Therefore, the elastic member 16e elastically deforms as the rotation advances, and elastic energy is stored so as to urge the hammer 16 in the direction opposite to the rotational direction (counterclockwise 1).

When the key 14 is released for the key release operation, the hammer 16 is released from the pressure applied by the key 14 via the actuator 14c. Therefore, the hammer 16 rotates counterclockwise about the support shaft 16d by the action of gravity due to the weight of the hammer 16, and the flat portion 16f pushes up the actuator 14c of the key 14 to move the hammer 16 and the initial position of the key 14 to each other. The return operation to is performed. At this time, since the elastic energy of the elastic member 16e elastically deformed by the key pressing operation applies a force in the direction (counterclockwise rotation) in which the hammer 16 returns to the initial position, the hammer 16 quickly returns to the initial position. be able to.

FIG. 3 shows a second embodiment of the keyboard device for an electronic musical instrument according to the present invention. The first embodiment shown in FIG. 1 differs from the first embodiment in the structure of the elastic projection 18 of the hammer 16 and the friction of the key 14. Only the shape of the engaging portion 14b is different, and other configurations are the same. In the second embodiment, the elastic projection 180 is a hook-shaped portion 180b that is elastic by integrally molding the second energy absorbing portion with the same synthetic resin as that of the hammer, and this hook-shaped portion 180b. The hook-shaped portion 180b is fixedly covered with an elastic covering member 180a as a first energy absorbing portion made of rubber or elastomer having a higher elasticity. Further, the frictional engagement portion 140b of the key 14 with which the elastic protrusion 180 abuts is shaped so as to be in close contact with the elastic covering member 180a. Also in this second embodiment, similarly to the first embodiment, the impact of the hammer 16 is first received by the elastic covering member 180a having a strong elastic force, and the elasticity is increased as the impact is absorbed and gradually weakened. Since the hook-shaped portion 180b having a weak force is used to receive the shock, it is possible to effectively absorb the impact when the key is strongly pressed.

[0018]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it has the following effects. Since the elastic member that promotes the return of the hammer and the key to the initial position is provided integrally with the hammer, the key striking property can be improved with a simple structure without increasing the number of parts and the number of assembly steps. Based on the action of gravity due to the weight of the hammer, the hammer is returned to its initial position, and the elastic energy of the elastic deformation of the elastic member is used to give the hammer a direction to return to the initial position. Since the power is given, a touch feeling very similar to that of an acoustic piano can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a keyboard device for an electronic musical instrument according to the present invention in a non-depressed state.

FIG. 2 is a cross-sectional view showing a depressed state of the keyboard device of the electronic musical instrument shown in FIG.

FIG. 3 is a cross-sectional view showing a second embodiment of a keyboard device for an electronic musical instrument according to the present invention in a state where no keys are pressed.

FIG. 4 is a perspective view of a holder.

FIG. 5 is a perspective view of the key seen from the inner surface direction.

FIG. 6 is an enlarged cross-sectional view of an essential part of FIG. 1, showing a relationship between an elastic member and a stopper portion when a key is not pressed.

FIG. 7 is an enlarged cross-sectional view of a main part of FIG. 2, showing a relationship between the elastic member and the stopper portion in a key-depressed state.

FIG. 8 is a schematic perspective view of the keyboard device of the electronic musical instrument shown in FIG. 1 with a key removed.

FIG. 9 is a sectional view of a keyboard device of a conventional electronic musical instrument.

FIG. 10 is a sectional view of a keyboard device of an electronic musical instrument according to a prior application.

[Explanation of symbols]

 10 keyboard frame 10a base portion 10b box portion 10c slit 10d vertical wall portion 10e slit 10f lower surface 10g bottom surface 10h upper surface 10i cushion 10j cushion 10k felt 10l felt 12 holder 12a base portion 12b key bearing portion 12c support shaft portion 12d hammer bearing 12d Groove 12f Hole 12g End 12h Stopper 14 Key 14a Inner surface 14b Friction engaging part 14c Actuator 14d Rear end 14e Spindle hole 14f Front end 14g Projection 14h Notch 16 Hammer 16a Arm 16b Tip 16c 16d Spindle 16e Elastic member 16f Flat part 16g Upper part 18 Elastic protrusion 18a Protrusion 18b Protrusion 18c Protrusion 20 Switch 100 Keyboard frame 102 pin 104 Key 106 pin 10 Hammer 110 leaf spring 120 keyboard frame 122 keyboard holder 124 first protrusion 126 key 128 second protrusion 130 hammer 132 flats 134 actuator 140b friction engagement portion 180 elastic projection 180a barb 180b elastic covering member

Claims (4)

[Scope of utility model registration request] 1. A keyboard device for an electronic musical instrument, comprising a key that is swingably disposed on a keyboard base portion and a hammer that is swingably linked with the key. An elastic member that acts so as to have an elastic force that biases the hammer in a direction opposite to the rotation direction of the hammer when the hammer is rotated is integrally provided on the hammer. A keyboard device for electronic musical instruments. 2. The keyboard device for an electronic musical instrument according to claim 1, wherein the hammer has a weight member insert-molded with an elastic resin. 3. The elastic body is a tongue-shaped portion integrally formed in the vicinity of a swing fulcrum portion of the hammer, and contacts the keyboard base portion when the hammer rotates by a predetermined angle. A keyboard device for an electronic musical instrument according to item 1 or 2. 4. The elastic body is a tongue-shaped portion integrally formed in the vicinity of a swing fulcrum portion of the hammer, and when the hammer is rotated by a predetermined angle, the elastic body is provided so as to project on the keyboard base portion. The keyboard device for an electronic musical instrument according to claim 1 or 2, wherein the keyboard device is in contact with the stopper portion.