JP5251085B2 - Electronic keyboard instrument pedal device - Google Patents

Description

  The present invention relates to a pedal device provided in an electronic keyboard instrument such as an electronic piano or an electronic organ.

  The acoustic piano has a mechanism for generating a sound by hitting a hammer against a string in accordance with the key depression, and the generated sound differs in sounding manner and magnitude depending on the strength and speed of the key depression. The acoustic piano is also equipped with a pedal for controlling the reverberation of the sound. For example, a grand piano is a damper pedal, a sostenuto pedal, or a soft pedal.

  Among these, the damper pedal is a pedal for controlling the damper for stopping the vibration of the string. The damper is provided in a one-to-one correspondence with the string, and normally, the damper is released from the string by pressing the key, and the sound is stopped by pressing the string by releasing the key. Each damper is connected to a damper pedal (hereinafter, simply referred to as “pedal”) through some connecting portions. When the pedal is depressed, the dampers corresponding to all strings are released, and even if the finger is released from the key, the damper does not stop and the key pressed sound remains. In this case, all the strings including the strings corresponding to the keys that are not pressed resonate, and the overtones sound clearly. By operating the damper with the pedal in this way, various expressions can be given to the pronunciation of the piano.

  By the way, a so-called play is provided at the connecting portion between each damper and the pedal. By this play, the performer can always put his foot on the pedal and can perform an operation called a so-called half pedal in which the damper is depressed to a position where the damper slightly restrains the string. Thus, the damper does not operate when the pedal is depressed shallowly, and the damper is pushed up only when the pedal is depressed to a predetermined position. Accordingly, the reaction force (load applied to the foot) accompanying the depression of the pedal changes stepwise (abruptly) at the position where the damper starts to be pushed up.

  There is an electronic piano as an electronic keyboard instrument that simulates the tone, operability, and appearance of an acoustic piano as described above. Some electronic pianos are equipped with three pedals that function in the same way as damper pedals, sostenuto pedals, and soft pedals in grand pianos. However, in the case of an electronic piano, it is not necessary to perform an operation of separating the damper from the string because the string is not actually played by sounding like an acoustic piano. Instead, the processing corresponding to the pedal operation is electrically performed, and the sound generation equivalent to the operation of the pedal is performed. Therefore, the mechanism of the pedal device itself is simple. For example, a spring or the like is installed between a pedal that is rotatably attached to the frame and the bottom plate, and an upward reaction force is applied to the pedal by the bias of the spring. Yes.

  Among such electronic piano pedal devices, some pedals are urged by a single spring. However, when the spring is urged by a single spring, the pedal reaction force felt by the performer becomes continuous with respect to the displacement of the pedal, causing a gradual change like when a damper is pushed up on a grand piano. I can't. Therefore, when a player who is accustomed to an acoustic piano plays an electronic piano, the player sometimes feels uncomfortable due to the difference in performance feeling. Also, the performer could not grasp the position of the half pedal as a sensation.

In order to improve this point, the pedal device described in Patent Document 1 includes a second spring in addition to the first spring, and the force of only the first spring and the first and second springs according to the amount of displacement of the pedal. The combined force is applied to the pedal in order, and the reaction force of the pedal is changed step by step. Thereby, the reaction force can be changed in a pseudo manner when the damper is pushed up.
JP 2004-334008 A

  In the pedal device described in Patent Document 1, the reaction force can be changed in a stepwise manner according to the displacement of the pedal as described above, so that the operation feeling of the pedal can be brought close to an acoustic piano. This is a problem.

  The conventional example shown in FIG. 1 of Patent Document 1 includes a second spring and a long lever for applying a biasing force to the pedal, and the number of components of the pedal device is increased. Furthermore, since the long lever and the pedal are installed so as to cross each other, a large mounting space is required around the pedal. These may lead to an increase in the size of the pedal device and an increase in the cost of the electronic keyboard instrument.

  In the conventional example shown in FIG. 2 of Patent Document 1, since a lever is not provided, it is possible to save space compared to the conventional example shown in FIG. 1, but because two springs are installed side by side, Compared to a pedal device having a single spring, an extra space is required to install the spring. This increases the mounting space around the pedal.

  In the conventional example shown in FIG. 4 of Patent Document 1, an elastic body is provided in the middle of the pedal, and the pedal is bent by deformation of the elastic body so that the reaction force against the depression of the pedal changes stepwise. However, in this configuration, since the position of the pivoting fulcrum of the pedal changes during the stepping operation, the operation of the pedal becomes unnatural and the feeling of operating the pedal becomes uncomfortable.

  The present invention has been made in view of the above points, and its purpose is to obtain a pedal operation feeling close to that of an acoustic piano while saving space, simplifying the configuration, and reducing the cost of the apparatus. An object of the present invention is to provide a pedal device for an electronic keyboard instrument.

  In order to solve the above-described problems, an electronic keyboard instrument pedal device according to the present invention includes a pedal, a frame that supports the pedal so as to be movable in accordance with a stepping operation, and a first step with respect to the pedal from a pedal depression start position. A first reaction force generating member that applies a reaction force; and a second reaction force generation member that applies a second reaction force to the pedal from a position where the pedal is depressed a predetermined amount from the pedal depression start position; The second reaction force generating member is arranged substantially concentrically with the first reaction force generating member.

  According to this configuration, although the two reaction force generating members are provided, the space for installing the reaction force generating members can be reduced by arranging them substantially concentrically. Therefore, it is possible to realize a mechanism that changes the reaction force against the depression of the pedal step by step with a space saving equivalent to that of a conventional pedal device including only one reaction force generation member (single spring). As a result, the pedal operation feeling close to that of an acoustic piano can be favorably obtained while reducing the size and space of the pedal device.

  In addition, the pedal device for an electronic keyboard instrument according to the present invention applies a first reaction force to the pedal from a pedal, a frame that supports the pedal so as to be movable in response to a depression operation, and a pedal depression start position. A first reaction force generating member, and a second reaction force generating member that applies a second reaction force to the pedal from a position where the pedal is depressed by a predetermined amount from the pedal depression start position. One of the force generation member and the second reaction force generation member is disposed inside the other.

  According to this configuration, although two reaction force generation members are provided, the installation space for the reaction force generation member can be reduced by arranging one inside the other. Therefore, it is possible to realize a mechanism that changes the reaction force against the depression of the pedal step by step with a space saving equivalent to that of a conventional pedal device including only one reaction force generation member (single spring). As a result, the pedal operation feeling close to that of an acoustic piano can be favorably obtained while reducing the size and space of the pedal device.

  In the pedal device, the first reaction force generation member and the second reaction force generation member may be integrally formed.

  According to this configuration, while realizing a structure that changes the reaction force against the pedal step by step, it is not necessary to increase the number of parts of the pedal device, and the configuration of the pedal device can be simplified and reduced in cost. Can do.

  In the pedal device described above, the first reaction force generation member and the second reaction force generation member may be coil springs having different radial dimensions.

  According to this configuration, the reaction force against the depression of the pedal can be changed stepwise with a simple configuration. In addition, by adjusting the axial length or installation position of both coil springs, the pedal depression position where the reaction force changes stepwise can be adjusted to an arbitrary position, or the coil springs can be applied with pre-pressurized pressure. By installing the, it is possible to easily adjust the reaction force against the pedal depression to an arbitrary strength, so that the operation feeling of the pedal of a natural keyboard instrument can be reproduced more faithfully.

  According to the pedal device according to the present invention, it is possible to satisfactorily obtain a pedal operation feeling similar to an acoustic piano while saving space, simplifying the configuration, and reducing the cost of the device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, among both sides in the longitudinal direction of the pedal, which will be described later, the player's side of the electronic keyboard instrument that operates the pedal is referred to as the front or the front, and the opposite side is referred to as the back or the rear.

[First Embodiment]
FIG. 1 is a diagram showing a configuration example of a pedal device according to a first embodiment of the present invention, where (a) is a plan view, (b) is a side view, (c) is a front view, and (d) is ( It is AA arrow sectional drawing of a). The pedal device 1 is mounted on an electronic keyboard instrument such as an electronic piano and is stepped on with a foot. The first coil spring (first reaction force generating member) 40 and the second coil spring (second reaction force generating member) 50 that generate the above are configured. Note that the pedal device 1 includes three pedals corresponding to a damper pedal, a sostenuto pedal, and a soft pedal in a grand piano. In FIG. Only 10 is shown, and the other pedals are not shown. Since the configuration of the pedal device according to the present invention is applied to the pedal 10 corresponding to the damper pedal, the pedal 10 and its peripheral components will be described below.

  The frame 20 is formed in a substantially rectangular box shape by appropriately bending a plate-like member made of metal or the like. The inner side of the frame 20 is a substantially rectangular space, and a part of the space above is open. The frame 20 is formed in a horizontally long shape extending over a position corresponding to each pedal 10, and openings 23 and 24 are formed at the attachment positions of the pedal 10 on the front wall 21 and the rear wall 22, respectively.

  The pedal 10 is made of a substantially flat member formed in a long shape, and the front side is an operation unit 11 that is stepped on with a foot, and the rear side is an attachment unit 12 that is attached to the frame 20. The pedal 10 has an upper wall 10a along the longitudinal direction and both side walls 10b, 10b. As shown in FIG. 1 (d), the cross-sectional shape of the operation portion 11 is formed in an arch shape in which the lower surface side is recessed. Has been. In addition, although illustration is abbreviate | omitted, the cross-sectional shape of the attaching part 12 is a substantially U shape where the lower surface side was depressed. A bent piece 13 formed by bending the edge of the opening upward is provided on the upper surface in the vicinity of the rear end of the mounting portion 12.

  The opening 23 provided in the front wall 21 of the frame 20 is formed in a rectangular shape larger than the cross section of the pedal 10. On the inner periphery of the opening 23, flat bent plate portions 23a and 23a formed by bending the edges of both side portions backward are provided. On the other hand, the opening 24 provided in the rear wall 22 is formed in a substantially U shape along the cross section of the pedal 10.

  The pedal 10 is inserted into the frame 20 from the opening 23, the mounting portion 12 is installed in the frame 20, and the rear end protrudes rearward from the opening 24. At this time, the bent piece 13 of the pedal 10 comes into contact with the upper edge of the opening 24 of the rear wall 22 so that these are rotatably engaged. The pedal 10 is installed so that the operation portion 11 can swing in the vertical direction around the fulcrum 14 where the bent piece 13 and the opening 24 are engaged.

  A first coil spring 40 and a second coil spring 50 are installed below the pedal 10 in the frame 20. Each of the first coil spring 40 and the second coil spring 50 is a spring material obtained by winding an elastic wire such as metal in a coil shape, and generates a resilient force (biasing force) by being compressed in the axial direction. Is. The first coil spring 40 and the second coil spring 50 are placed on the bottom wall 25 near the front end in the frame 20. The first coil spring 40 is smaller in diameter than the second coil spring 50, and is concentrically or substantially concentrically installed inside the second coil spring 50. Further, the first coil spring 40 has a larger height dimension (a length dimension in the axial direction) in the installed state than the second coil spring 50. Therefore, the upper end of the first coil spring 40 protrudes upward from the upper end of the second coil spring 50.

  The upper end of the first coil spring 40 is in contact with the lower surface of the pedal 10. The pedal 10 is stationary in a state where it is placed on the first coil spring 40 at a position where the depression operation is started (hereinafter, this position is referred to as an “initial position”). That is, in this initial position, the weight of the pedal 10, the drag received by the guide member 15 in contact with the upper wall 29 of the frame 20 via the cushioning material 16 described later, and the biasing force of the first coil spring 40 are balanced. Yes. In this initial position, the pedal 10 is supported at the rear of the mounting portion 12 by the fulcrum 14 and is supported at the front of the mounting portion 12 by the first coil spring 40, and the front-rear direction is substantially horizontal.

  On the other hand, the second coil spring 50 is held by a pair of strip-like holding pieces 26 and 27 provided on the frame 20. The holding pieces 26 and 27 include a front holding piece 26 that holds the front of the second coil spring 50 and a rear holding piece 27 that holds the rear. The front holding piece 26 protrudes rearward from the front wall 21 of the frame 20, then bends upward and goes upward along the front surface of the second coil spring 50, and the tip thereof is bent rearward to be bent to the second coil spring 50. It is in contact with the upper end of. On the other hand, the rear holding piece 27 protrudes upward from the bottom wall 25 of the frame 20 and moves upward along the rear surface of the second coil spring 50, and its tip is bent forward and comes into contact with the upper end of the second coil spring 50. Yes. The second coil spring 50 is installed in a state in which the upper end is pressed by the front holding piece 26 and the rear holding piece 27 and is contracted by a predetermined amount (a state in which pressure is applied). When the pedal 10 is in the initial position, the lower ends of both side walls 10 b and 10 b of the pedal 10 are located slightly above the upper end of the second coil spring 50.

  A guide member 15 is installed on the pedal 10. The guide member 15 is a substantially rectangular member installed at the front end of the mounting portion 12 and has a width dimension substantially the same as that of the mounting portion 12. A plurality of small protrusions 15 a (two on each side in the figure) are provided on both side surfaces of the guide member 15. The small protrusions 15 a are in contact with the inner surface of the bending plate portion 23 a of the frame 20. As a result, the guide member 15 moves up and down inside the bent plate portions 23a and 23a while the small protrusion 15a slides with respect to the bent plate portions 23a and 23a as the pedal 10 swings. Guide the swing. The guide member 15 also serves as an upper limit stopper for defining the upper limit position of the pedal 10. Therefore, the guide member 15 comes into contact with the upper wall 29 of the frame 20 in a state where the pedal 10 is in the initial position (uppermost position). A cushioning material 16 is attached between the upper wall 29 of the frame 20 and the guide member 15 to mitigate the impact caused by these collisions.

  On the other hand, a lower limit stopper 17 for defining a lower limit position of the pedal 10 is attached to the front holding piece 26. The lower limit stopper 17 is made of a cushioning material for alleviating the impact caused by the collision of the pedal 10, and faces the lower ends of the side walls 10b, 10b of the pedal 10 at the initial position with a predetermined distance. Is installed. Although not shown, the pedal device 1 is also provided with various electric mechanisms such as a switch contact and a volume detector for converting the operation of the pedal 10 into an electrical output.

  The operation of the pedal device 1 having the above configuration will be described. When the performer steps on the pedal 10 at the initial position with his / her foot, first, the pedal 10 rotates about the fulcrum 14 while the first coil spring 40 is compressed, and the operation unit 11 descends. At this time, the pedal 10 is given a first reaction force due to the biasing force of the first coil spring 40. When the pedal 10 is further lowered, the side walls 10 b and 10 b come into contact with the second coil spring 50. When the pedal 10 is further depressed from that position, the second coil spring 50 is compressed and the pedal 10 is lowered. At this time, the pedal 10 is applied with the first reaction force by the first coil spring 40 and the second reaction force by the second coil spring 50 together. When the pedal 10 is further stepped on in this state, both side walls 10b, 10b of the pedal 10 come into contact with the lower limit stopper 17, and the pedal 10 stops at the lower limit position.

  On the other hand, when the force depressing the pedal 10 at the lower limit position is weakened, the pedal 10 is raised by the first and second reaction forces by the first and second coil springs 40 and 50. When the pedal 10 is raised, the pedal 10 is separated from the second coil spring 50, and then further raised by the first reaction force by the first coil spring 40 and returned to the initial position.

  The first coil spring 40 is in contact with the pedal 10 from when the pedal 10 is in the initial position (depression start position). Thus, the first reaction force is generated from the initial position with respect to the pedal 10. On the other hand, the second coil spring 50 comes into contact with the pedal 10 at a position where the pedal 10 is depressed by a predetermined amount from the initial position, and generates a second reaction force with respect to the pedal 10 from that position. It is like that. Therefore, if the pedal 10 is set to contact the second coil spring 50 at a position corresponding to the position where the damper starts to be pushed up on the acoustic piano, the reaction force accompanying the depression of the pedal 10 can be changed stepwise at this position. The operation feeling of the damper pedal of an acoustic piano accompanied by the pushing up of the damper can be reproduced well.

  Further, the second coil spring 50 is installed in a state compressed in advance by the holding pieces 26 and 27 (a state in which a pressurized pressure is applied). Thereby, the second coil spring 50 generates a sufficient reaction force (second reaction force) from the start of contact with the pedal 10. Accordingly, it is possible to more faithfully reproduce the sudden reaction force change when the damper is pushed up in the pedal of the acoustic piano, and the operation feeling of the pedal 10 can be made closer to the damper pedal of the acoustic piano.

  In the pedal device 1, the first coil spring 40 is installed concentrically inside the second coil spring 50. Accordingly, a conventional pedal having only one reaction force generating member (single spring) while realizing a structure in which two reaction force generating members are installed to change the reaction force with respect to the depression of the pedal 10 stepwise. Space saving equivalent to the device can be achieved. In other words, in the configuration example shown in FIG. 1, the first coil spring 40 is disposed inside the second coil spring 50, so that the first and second coil springs 40, 50 in the frame 20, as shown in FIG. A gap is formed behind the pedal 10 and above the pedal 10. Therefore, if switch contacts and other electric parts are arranged in these gaps, the space in the frame 20 can be used effectively, and the pedal device 1 can be reduced in size and space.

  Moreover, in the pedal apparatus 1 of this embodiment, although the 1st coil spring 40 and the 2nd coil spring 50 are comprised as a separate component, in addition to this, the 1st coil spring 40 and the 2nd coil spring 50 are integrally formed as one component. It is also possible to form. In that case, what is necessary is just to make what is called a folding double structure which connects the lower ends of the 1st coil spring 40 and the 2nd coil spring 50, and arrange | positions the 1st coil spring 40 concentrically inside the 2nd coil spring 50. If the first coil spring 40 and the second coil spring 50 are integrally formed in this way, the reaction force generating member becomes one component, so that the number of components of the pedal device 1 can be reduced, and the configuration is simplified. be able to.

  In the present embodiment, the case where the first coil spring 40 is disposed concentrically inside the second coil spring 50 has been shown. However, the first coil spring 40 is located inside the second coil spring 50 and is located with respect to the second coil spring 50. It is also possible to arrange them at positions shifted from the center (positions that are not concentric or substantially concentric).

  Further, in the present embodiment, the case where the first coil spring 40 that is the first reaction force generating member is disposed inside the second coil spring 50 that is the second reaction force generating member has been described. The second coil spring 50 can be installed inside the first coil spring 40.

[Second Embodiment]
Next, a pedal device according to a second embodiment of the present invention will be described. In the description of the second embodiment and the corresponding drawings, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted below. In addition, matters other than those described below are the same as those in the first embodiment.

  2A and 2B are views showing a pedal device 1-2 according to a second embodiment of the present invention, in which FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a first coil spring 40 and a plate described later. 4 is a partially enlarged plan view showing a detailed configuration of a spring 60. FIG. The pedal device 1-2 of the present embodiment is different from the pedal device 1 of the first embodiment in the configuration of the second reaction force generating member. That is, in the first embodiment, as the second reaction force generating member, the second coil spring 50 disposed outside the first coil spring 40 is provided, but in the present embodiment, the second coil spring 50 is used instead of the second coil spring 50. A plate spring 60 disposed outside the one coil spring 40 is provided. The leaf spring 60 is a member made of an elastic material such as metal and formed in a substantially rectangular flat plate shape. The leaf spring 60 generates an elastic force (biasing force) by being bent in the front-rear direction so that the distance between the front end side and the rear end side is reduced.

  As shown in FIG. 2C, a circular opening 61 for arranging the first coil spring 40 is provided at the center position of the leaf spring 60. Since the first coil spring 40 is arranged at the center of the opening 61, the first coil spring 40 is arranged concentrically with the plate spring 60 inside the plate spring 60. The leaf spring 60 includes a pedal contact portion 62 that contacts the pedal 10, a front frame contact portion 63 that contacts the front holding piece 26 and the rear holding piece 27 of the frame 20, and a rear frame contact portion 64, respectively. Is provided. The pedal contact portions 62 are provided on both sides of the front end side of the leaf spring 60, and both pedal contact portions 62, 62 are in contact with the lower ends of both side walls 10b, 10b of the pedal 10, respectively. Yes. Further, the front end side between both pedal contact portions 62, 62 is cut into a substantially U-shape, and a front frame contact portion 63 is provided in the cut. On the other hand, the center of the rear end side of the leaf spring 60 is also cut into a substantially U shape, and a rear frame abutting portion 64 is provided in the cut. Both the front frame abutting portion 63 and the rear frame abutting portion 64 include cylindrical rollers 63a and 64a that are rotatably installed. It is desirable that the rollers 63a and 64a be formed of a material having at least a surface having elasticity. As a result, the front holding piece 26 and the rear holding piece 27 are elastically contacted and can be smoothly moved thereon. In this embodiment, since the rear frame abutting portion 64 does not move relative to the rear holding piece 27, the rear frame abutting portion 64 may be composed of a non-rotating member other than the roller 64a, and has elasticity. You may form with the hard material which does not.

  Furthermore, in this embodiment, the arrangement and shape of the front holding piece 26 and the rear holding piece 27 are slightly different from those of the first embodiment, and as shown in FIG. The upper end of the front holding piece 26 is positioned upward. The leaf spring 60 is engaged with the upper end of the front holding piece 26 and the upper end of the rear holding piece 27, respectively, and is inclined so that its surface slightly rises from the rear holding piece 27 toward the front holding piece 26. It is installed at. The leaf spring 60 is installed in a slightly bent state so as to swell downward between the front holding piece 26 and the rear holding piece 27, and pressure is applied by the front holding piece 26 and the rear holding piece 27. Installed. Further, the pedal abutting portion 62 of the leaf spring 60 is separated from the both side walls 10b, 10b of the pedal 10 by a predetermined distance in a state where the pedal 10 is in the initial position. It contacts the leaf spring 60 at the depressed position.

  The operation of the pedal device 1-2 having the above configuration will be described. 3 (a) and 3 (c) are side views of the pedal device 1-2 showing a state before and after the pedal 10 is depressed, respectively, and (b) and (d) are respectively (a) and (d). It is a figure which shows the reaction force which generate | occur | produces in the leaf | plate spring 60 in the state of c). First, in the state where the pedal 10 is in the initial position (the position before being depressed) shown in FIG. 5A, the pedal 10 is not in contact with the leaf spring 60, but the front frame contact portion 63 of the leaf spring 60 is in front. Due to the contact with the holding piece 26, a reaction force F is generated in the pedal contact portion 62 of the leaf spring 60 as shown in FIG. This reaction force F can be decomposed into a component force Fx in the horizontal direction and a component force Fy in the vertical direction.

  When the pedal 10 in the initial position is stepped on with the foot, the first coil spring 40 is compressed, the pedal 10 is rotated around the fulcrum 14 and the operation portion 11 is lowered. At this time, the pedal 10 is given a first reaction force due to the biasing force of the first coil spring 40. When the pedal 10 is further lowered, the side walls 10 b and 10 b come into contact with the pedal contact portions 62 and 62 of the leaf spring 60. When the pedal 10 comes into contact with the leaf spring 60, the component force Fy in the vertical direction of the reaction force F generated in the leaf spring 60 acts as a second reaction force on the pedal 10. When the pedal 10 is further depressed from that position, the pedal abutting portions 62 and 62 of the leaf spring 60 are pushed down by the pedal 10 as shown in FIG. At this time, the pedal 10 is provided with a first reaction force by the first coil spring 40 and a component force Fy which is a second reaction force by the leaf spring 60.

  When the pedal 10 is depressed, the front frame contact portion 63 of the leaf spring 60 is lowered while being guided by the front holding piece 26. On the other hand, the rear frame contact portion 64 of the leaf spring 60 does not move while being in contact with the upper end of the rear holding piece 27. Therefore, the posture of the leaf spring 60 changes so that the inclination in the front-rear direction gradually decreases as the depression amount of the pedal 10 increases. Due to such a change in the posture of the leaf spring 60, the acting direction of the reaction force F changes as shown in FIG. 3D, and the reaction force F after the pedal 10 is depressed and the component force Fy in the vertical direction thereof. Is larger than the angle θ1 formed by the reaction force F before the depression and the component force Fy in the vertical direction (θ2> θ1). Therefore, the component force Fy after the pedal 10 comes into contact with the leaf spring 60 gradually decreases as the amount of depression of the pedal 10 increases. As a result, the combined reaction force of the first reaction force and the second reaction force applied to the pedal 10 increases as the amount of depression of the pedal 10 increases, but changes so that the increase rate gradually decreases. .

  When the pedal 10 is further lowered, the side walls 10b and 10b come into contact with the lower limit stopper 17 and the pedal 10 stops at the lower limit position. On the other hand, when the force depressing the pedal 10 at the lower limit position is loosened, the pedal 10 is raised by the first and second reaction forces of the first coil spring 40 and the leaf spring 60. As the pedal 10 rises, the front frame contact portion 63 of the leaf spring 60 rises, and the leaf spring 60 changes its posture in the opposite direction. After the front frame contact portion 63 returns to the position where it contacts the upper end of the front holding piece 26, the pedal 10 is separated from the leaf spring 60, and then the pedal 10 is further raised by the first reaction force by the first coil spring 40. To return to the initial position.

  FIG. 4 is a graph showing the relationship between the displacement of the damper pedal (the amount of depression from the initial position) and the reaction force applied to the damper pedal in a conventional grand piano. In the graph shown in the figure, a one-dot chain line indicates a reaction force when the damper pedal is depressed, and a two-dot chain line indicates a reaction force when the depression of the damper pedal is released. As shown in the figure, when the damper pedal is depressed in the grand piano, the reaction force increases in a stepwise manner as indicated by the symbol I in the figure at the position where the damper pedal starts to push up the damper. In addition, after this stepwise increase, the reaction force applied to the damper pedal gradually increases, but the increase rate changes so as to decrease gradually. As shown by the part, it gradually increases along a curve that is slightly convex upward. In this graph, the reaction force suddenly increases in the vicinity of the maximum displacement amount of the damper pedal, but this sudden increase is caused by the damper pedal or the link member that can be connected to the damper pedal coming into contact with the stopper member. Thus, it is generated by the drag received from the stopper member.

  On the other hand, in the pedal device 1-2 of the present embodiment, the first coil spring 40 and the leaf spring 60 as described above are provided as a reaction force generating member that generates a reaction force against the depression of the pedal 10, Faithful to both the gradual change of the reaction force at the start of the damper push-up on the grand piano (change of the part indicated by symbol I) and the gradual change of the reaction force after the damper push-up (change of the part indicated by reference symbol II) Can be reproduced.

  As described above, in the pedal device 1-2 of the present embodiment, the leaf spring 60, which is the second reaction force generating member, changes its posture as the pedal 10 moves, and is generated by the leaf spring 60. The direction of action of the reaction force F on the pedal 10 is changed. As a result, Fy, which is the vertical component force of F, gradually decreases as the amount of depression of the pedal 10 increases. As described above, the combined reaction force of the first reaction force and the second reaction force increases as the amount of depression of the pedal 10 increases, but the displacement of the pedal 10 changes so that the rate of increase gradually decreases. A mechanism having a region is realized. Therefore, in the pedal of the electronic keyboard instrument, an operation feeling close to that of a grand piano pedal can be obtained satisfactorily.

  In the pedal device 1-2 of the present embodiment, the front frame contact portion 63 provided on the leaf spring 60 can be moved smoothly with respect to the front holding piece 26, in addition to the roller 63a. It may be a member that does not rotate. Furthermore, if a lubricant such as grease is applied to the front frame contact portion 63, the sliding with respect to the front holding piece 26 can be made smoother. Thereby, the front end side of the leaf spring 60 can be smoothly moved up and down along the front holding piece 26.

  Further, in order to prevent mechanical noise (contact sound) generated by contact with the pedal 10 and the frame 20, the pedal contact portions 62 and 62, the front frame contact portion 63, and the rear frame contact of the leaf spring 60 are used. The portion 64 may be covered with a soft resin material (elastomer material) or the like. Further, the same processing may be applied to the pedal 10 side portion (the lower ends of the side walls 10b, 10b) that contacts the pedal contact portion 62 of the leaf spring 60.

  In the present embodiment, the case where the reaction force generated by the leaf spring 60 is disposed so as to be disassembled as a component force in the vertical direction and the horizontal direction has been described. However, the leaf spring 60 generates the reaction force generated above. It is also possible to dispose the components so that they can be disassembled as component forces in directions other than the vertical direction and the horizontal direction. In the above description, the case where the component force in the vertical direction becomes the second reaction force applied to the pedal 10 has been described. However, depending on the arrangement configuration of the pedal 10 and the leaf spring 60, the component force in the horizontal direction may be 10 may be a second reaction force applied to 10 or a component force in another direction may be a second reaction force.

  FIG. 5 is a diagram illustrating another configuration example of the leaf spring 60 provided in the pedal device 1 of the present embodiment. In the example shown in the figure, the leaf spring 60 is divided into two leaf springs 60-1 and 60-2 arranged on both sides of the coil spring 40. Thus, the 2nd reaction force generating member may be constituted by a plurality of parts. The leaf springs 60-1 and 60-2 have the same shape and are formed of elongated plate-like members whose longitudinal direction extends in the front-rear direction, and a gap for arranging the coil spring 40 is provided between the leaf springs 60-1 and 60-2. . Further, the leaf springs 60-1 and 60-2 have their front ends connected to both sides of the front frame contact portion 63 and their rear ends connected to both sides of the rear frame contact portion 64.

  In the present embodiment, the case where the coil spring 50 as the first reaction force generating member and the leaf spring 60 as the second reaction force generating member are described has been described. However, a leaf spring as a first reaction force generating member that applies a first reaction force to the pedal 10 from the stepping start position of the pedal 10 and a position where a predetermined amount is depressed from the stepping start position of the pedal 10 It is also possible to include a coil spring as a second reaction force generating member that applies a second reaction force to the pedal 10. Also in this case, like the pedal device 1-2 of the second embodiment, the reaction force obtained by combining the first reaction force and the second reaction force increases with an increase in the depression amount of the pedal 10, but the increase A mechanism having a displacement region of the pedal 10 that changes so that the rate gradually decreases can be realized.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited.

  For example, the front holding piece 26 and the rear holding piece 27 may be formed integrally with the frame 20 or may be formed as a separate part from the frame 20 and fixed to the frame 20 by a separate fixing means.

  Moreover, in the said embodiment, although the case where the coil springs 40 and 50 and the leaf | plate spring 60 were used as a reaction force generation member which generate | occur | produces the reaction force with respect to depression of the pedal 10 was shown, as a reaction force generation member concerning this invention, In addition to the coil springs 40 and 50 and the leaf spring 60, it is possible to use a spring having another shape or a reaction force generating member having another structure such as a damper.

  In each of the above embodiments, the second reaction force generating member (second coil spring 50, leaf spring 60) disposed between the pedal 10 and the frame 20 is fixed in advance to the frame 20 side. As the second reaction force generating member comes into contact with the pedal 10 with the movement, the second reaction force is generated. On the contrary, the second reaction force generating member is set in advance. It is also possible to fix the pedal 10 so that the second reaction force is generated when the second reaction force generating member comes into contact with the frame 20 as the pedal 10 moves. Further, the first reaction force generating member may be fixed to either the pedal 10 or the frame 20.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structural example of the pedal apparatus of the electronic keyboard musical instrument concerning 1st Embodiment of this invention, (a) is a top view, (b) is a side view, (c) is a front view, (d) is ( It is AA arrow sectional drawing of a). It is a figure which shows the pedal apparatus concerning 2nd Embodiment of this invention, (a) is a top view, (b) is a side view, (c) is the elements on larger scale which show a 1st coil spring and a leaf | plate spring. It is a figure for demonstrating the operation | movement of the pedal in the pedal apparatus of 2nd Embodiment, (a), (c) is a side view of the pedal apparatus which shows the state before stepping on a pedal and after stepping on, respectively, (b), (D) is a figure which shows the reaction force which generate | occur | produces in the leaf | plate spring in the state of (a) and (c), respectively. It is a graph which shows the relationship (displacement amount) and reaction force in the damper pedal of a grand piano. It is a figure which shows the other structural example of a leaf | plate spring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pedal apparatus 1-2 Pedal apparatus 10 Pedal 11 Operation part 12 Mounting part 14 Supporting point 15 Guide member (upper limit stopper)
17 Lower limit stopper 20 Frame 21 Front wall 22 Rear wall 23 Opening portion 24 Opening portion 25 Bottom wall 26 Front holding piece 27 Rear holding piece 29 Upper wall 40 First coil spring (first reaction force generating member)
50 Second coil spring (second reaction force generating member)
60 leaf spring (second reaction force generating member)
61 Opening part 62 Pedal contact part 63 Front frame contact part 64 Rear frame contact part

Claims (5)

A long pedal,
A frame that supports the pedal so as to be movable in response to a depression operation;
A first reaction force generating member that is disposed below the pedal and applies a first reaction force to the pedal from a stepping start position of the pedal;
A second reaction force generating member that is disposed below the pedal and that applies a second reaction force to the pedal from a position where the pedal is depressed a predetermined amount from the depression start position of the pedal;
The pedal has an upper wall along a longitudinal direction and a side wall extending from the upper wall to the lower side of the pedal,
One of the first reaction force generation member and the second reaction force generation member abuts against the upper wall to give a reaction force to the pedal,
The other of the first reaction force generation member and the second reaction force generation member abuts against the side wall to give a reaction force to the pedal,
The second reaction force generation member is disposed substantially concentrically with the first reaction force generation member ,
The side walls are a pair of side walls disposed on both sides in the width direction with respect to the longitudinal direction of the upper wall,
The frame has a holding piece for holding the second reaction force generating member,
The second reaction force generating member is installed in a state where a pressure is applied by the holding piece,
The pedal device for an electronic keyboard instrument , wherein a width dimension of the holding piece is smaller than a width dimension between the pair of side walls . A long pedal,
A frame that supports the pedal so as to be movable in response to a depression operation;
A first reaction force generating member that is disposed below the pedal and applies a first reaction force to the pedal from a stepping start position of the pedal;
A second reaction force generating member that is disposed below the pedal and that applies a second reaction force to the pedal from a position where the pedal is depressed a predetermined amount from the depression start position of the pedal;
The pedal has an upper wall along a longitudinal direction and a side wall extending from the upper wall to the lower side of the pedal,
One of the first reaction force generation member and the second reaction force generation member abuts against the upper wall to give a reaction force to the pedal,
The other of the first reaction force generation member and the second reaction force generation member abuts against the side wall to give a reaction force to the pedal,
Either one of the first reaction force generation member and the second reaction force generation member is disposed inside the other ,
The side walls are a pair of side walls disposed on both sides in the width direction with respect to the longitudinal direction of the upper wall,
The frame has a holding piece for holding the second reaction force generating member,
The second reaction force generating member is installed in a state where a pressure is applied by the holding piece,
The pedal device for an electronic keyboard instrument , wherein a width dimension of the holding piece is smaller than a width dimension between the pair of side walls . The frame has a fulcrum that rotatably supports the pedal;
The first reaction force is generated such that the distance between the point of application of the second reaction force and the fulcrum in the pedal is substantially the same as the distance between the point of action of the first reaction force and the fulcrum. The pedal device according to claim 1, wherein a member and the second reaction force generating member are disposed.   4. The pedal device according to claim 1, wherein the first reaction force generation member and the second reaction force generation member are integrally formed. 5.   The pedal device according to any one of claims 1 to 4, wherein the first reaction force generation member and the second reaction force generation member are coil springs having different diameters.

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