EP2372694B1 - Pedal device for electronic keyboard instrument - Google Patents
Pedal device for electronic keyboard instrument Download PDFInfo
- Publication number
- EP2372694B1 EP2372694B1 EP11153681.9A EP11153681A EP2372694B1 EP 2372694 B1 EP2372694 B1 EP 2372694B1 EP 11153681 A EP11153681 A EP 11153681A EP 2372694 B1 EP2372694 B1 EP 2372694B1
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- EP
- European Patent Office
- Prior art keywords
- pedal
- reaction force
- force application
- depression
- application device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000000881 depressing effect Effects 0.000 claims description 3
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Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
- G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
- G10H1/344—Structural association with individual keys
- G10H1/348—Switches actuated by parts of the body other than fingers
Definitions
- the present invention relates to a pedal device for an electronic keyboard instrument.
- Japanese Laid-open Patent Application, Publication No. JP2004-334008 describes a pedal device that is equipped with a first pedal lever that is operated through depression by the performer, a second pedal lever that moves together with the first pedal lever when the first pedal lever is depressed by an amount greater than the reference amount, and a first spring and a second spring that give reaction forces countering the depression operation of the first pedal lever to the first pedal lever and the second pedal level, respectively.
- the operation load to the first pedal lever is changed in a stepwise fashion according to the depression amount by the first spring and the second spring, whereby a feeling of operation similar to that given by the damper pedal of an acoustic piano can be realized.
- FIG. 2009/0314156 A1 discloses a pedal device for an electronic keyboard apparatus to add sound effects to musical notes generated by the electronic keyboard apparatus in response to an operator depressing the pedal device, comprising at least one pedal that is moved in response to a depression operation, a first reaction force application device that is configured to apply a first reaction force countering a depression of the pedal by the operator from an initial state to a specified state, wherein the first reaction force increases as the pedal is depressed from the initial state to the specified state, and a second reaction force application device that is configured to apply a second reaction force countering a depression of the pedal by the operator after the specified state , wherein after the specified state the first reaction force and the second reaction force are applied to the pedal.
- a pedal device used by a performer of an electronic keyboard apparatus includes a pedal that is moved in response to a depression operation from the performer; a chassis that rotationally supports the pedal according to the depression operation to move the pedal downwardly about a supporting position supported by the chassis; a first reaction force application device that applies a first reaction force countering the depression operation of the pedal to the pedal; and a second reaction force application device that is pre-compressed in a state in which the amount of depression of the pedal does not reach a specified amount, and is compressed in association with the depression operation of the pedal when the amount of depression of the pedal exceeds the specified amount, wherein the second reaction force application device applies a second reaction force with an elastic force countering the depression operation to the pedal.
- the first reaction force application device is located between the supporting position of the pedal and the operation position, and wherein the first reaction force is applied to the pedal at a position between the supporting position and the operation position.
- the second reaction force application device is located between a position of the first reaction force application device and the operation position, and wherein the second reaction force application device applies the second reaction force to the pedal at a position between a position of the first reaction force application device and the operation position.
- the described embodiments provide a pedal device of an electronic keyboard apparatus, capable of reducing the size thereof, while realizing a feeling of operation similar to that of the damper pedal of an acoustic piano.
- a pedal device of an electronic keyboard apparatus is equipped with a first reaction force application device that gives a first reaction force countering a depression operation to the pedal, and a second reaction force application device that is compressed in association with the depression operation of the pedal when the amount of depression exceeds a specified amount, and applies a second reaction force with an elastic force countering the depression operation to the pedal, such that the operation load of the pedal can be changed in a stepwise fashion according to the amount of depression. Therefore, it is possible to realize a feeling of operation similar to that given by the damper pedal of an acoustic piano.
- the first reaction force application device is provided between a supporting position of the pedal supported by a chassis and an operation position of the pedal that is operated through depression by the performer.
- the first reaction force application device applies the first reaction force to the pedal at a location between the supporting position and the operation position.
- the second reaction force application device is provided between a position of the first reaction force application device and the operation position of the pedal. Further, the second reaction force application device applies the second reaction force to the pedal at a location between the arranged position of the first reaction force application device and the operation position. This is effective in making the second reaction force application device smaller in size and making the pedal device smaller in size.
- the elastic force of the second reaction force application device that is necessary for applying the second reaction force to the pedal may become smaller, based on the principle of leverage, when the second reaction force application device is located farther from the supporting position of the pedal and closer to the operation position, and may become greater as it is located farther from the operation position of the pedal and closer to the supporting position. For this reason, if the second reaction force is applied to the pedal at a position between the arranged position of the first reaction force application device and the supporting position, then the second reaction force application device needs a greater elastic force, which, as a result, causes the second reaction force application device to become larger in size. In other words, when the second reaction force application device is to be formed from a coil spring, its coil wire needs to be thicker or the coil outer diameter needs to be larger.
- the second reaction force application device has a position set farther from the supporting position of the pedal and closer to the operation position, which allows the elastic force required for the second reaction force application device to be made smaller.
- the second reaction force application device can be made smaller in size, and the pedal device can be made smaller.
- the accuracy in the pedal operation load can be improved.
- the second reaction force application device becomes larger in size, and the accuracy in its elastic force is lowered.
- the second reaction force application device is formed from a coil spring, and its coil wire is made thicker or the outer coil diameter is made larger, its load accuracy also lowers. As a result, differences would likely occur in the pedal operation load accuracy from one device manufactured to another.
- the second reaction force application device can be made smaller in size, and lowering of the accuracy in its elastic force can be suppressed.
- the pedal operation load accuracy for each of the pedal devices manufactured can be improved.
- the pedal device may be equipped with a restriction device that is provided at a position between the arranged position of the first reaction force application device and the operation position of the pedal and restricts a lower limit position of the pedal by restricting rotational movement of the pedal.
- the second reaction force application device is disposed opposite to the restriction device, and compressed in association with the depression operation of the pedal upon abutting against the restriction device when the amount of depression of the pedal exceeds a specified amount, which is effective in that the amount of depression (the specified amount) of the pedal until the second reaction force is applied to the pedal can be accurately set.
- the amount of depression (the specified amount) of the pedal until the second reaction force is applied to the pedal is desired to have a high accuracy when the performer performs while placing his foot on the pedal, or for a depression operation called half-pedaling.
- a backlash is difficult to be influenced by the dimensional accuracy of the second reaction force application device (the dimensional accuracy in the direction in which the pedal is depressed) when the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the operation position, and the accuracy is higher.
- the backlash would readily be influenced by the dimensional accuracy of the second reaction force application device when the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the supporting position, and the accuracy would become lower. For this reason, if the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the supporting position, differences in the backlash would likely occur in individual devices manufactured.
- the backlash can be made more difficult to be influenced by the dimensional accuracy of the second reaction force application device, whereby differences in the backlash can be suppressed.
- backlash can be accurately set for each of the individual apparatuses manufactured.
- the pedal device may be equipped with an actuator that is removably attached to the pedal and has a stopper section disposed opposite to the restriction device in a state of the actuator being attached to the pedal.
- the second reaction force application device is fitted inside the stopper section. Therefore, the stopper section can be used as a storage space for the second reaction force application device, which is effective in making the device smaller in size.
- the second reaction force application device is attached to the pedal in one piece with the actuator, such that the second reaction force application device, together with the actuator, can be attached to the pedal. This is effective in improving the workability. Furthermore, even if the pedal is not equipped with the second reaction force application device, the second reaction force application device can be provided thereon by replacing the actuator, and feeling of operation similar to that provided by the damper pedal of an acoustic piano can be realized.
- the pedal device may be equipped with a sensor that detects the amount of depression of the pedal based on the amount of rotational movement of the pedal, and is structured to output an electrical signal to the electronic keyboard apparatus according to a detection result of the sensor, wherein the actuator is equipped with a transmission section that transfers the amount of rotational movement of the pedal to the sensor. Therefore, by suitably changing the shape of the transmission section, the relation between the amount of depression of the pedal and the electrical signal to be outputted to the electronic keyboard apparatus can be arbitrarily set. Accordingly, it is effective in that the electrical signal to be outputted to the electronic keyboard apparatus can be readily interlocked with changes in the operation load of the pedal.
- the pedal device may be equipped with a plurality of pedals, and is equipped with the second reaction force application device for at least one of the plurality of pedals.
- a pedal whose operation load changes in a stepwise fashion according to the amount of depression and a pedal whose operational load is constant regardless of the amount of depression of the pedal can be co-existed, such that a single device can be provided with the pedals having feelings of operation different from one another.
- the described embodiments relate to a pedal device for an electronic keyboard instrument and, in particular to a pedal device of an electronic keyboard instrument that is capable of reducing the size thereof, while realizing a feeling of operation similar to that of the damper pedal of an acoustic piano.
- FIG. 1 is an exploded perspective view of a pedal device 1 of an electronic keyboard apparatus in accordance with an embodiment of the invention. It is noted that arrows U-D, L-R and F-B in FIG. 1 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 1 of the electronic keyboard apparatus, respectively.
- the pedal device 1 is used for an electronic keyboard apparatus, such as, an electronic piano or the like (not shown), and is a device for adding various types of sound effects to musical notes generated by the electronic keyboard apparatus.
- the pedal device 1 is mainly equipped with a chassis 10 composing a main body, and a first pedal 20, a second pedal 30 and a third pedal 40 arranged side by side in the left-right direction of the chassis 10.
- the pedal device 1 outputs a voltage value corresponding to the amount of depression to the electronic keyboard apparatus, and is structured to give sound effects similar to those created by a soft pedal, a sostenuto pedal and a damper pedal of an acoustic piano to musical notes of the electronic keyboard apparatus.
- the chassis 10 is composed of an upper chassis 10a (also referred to herein as a part of the chassis) and a lower chassis 10b (also referred to herein as a part of the chassis) formed from resin material such as ABS resin.
- the upper chassis 10a and the lower chassis 10b are parts of the chassis superposed and assembled together into a hollow box shape having an internal space S for mounting a first spring 50, a sensor 60 and a circuit board 70 therein.
- a connection cable 71 extends from the circuit board 70 for connecting the pedal device 1 to the electronic keyboard apparatus.
- the first pedal 20, the second pedal 30 and the third pedal 40 correspond to a soft pedal, a sostenuto pedal and a damper pedal of an acoustic piano, respectively, and are each formed from metal material such as brass, iron steel and the like into an elongated plate shape.
- the pedals 20, 30 and 40 have rear end sections supported by the chassis 10, and front end sections that are exposed on the front side of the chassis 10. Each of the pedals 20, 30 and 40 may be depressed at the front end section side by the performer, thereby being rotationally moved downwardly about the supporting position as a pivot supported by the chassis 10.
- a first spring 50 applies a reaction force countering a depression operation to each of the pedals 20, 30 and 40, and may be composed of a coil-shaped compression spring. Also, the first spring 50 is arranged at each of the pedals 20, 30 and 40, and is retained between the chassis 10 and each of the pedals 20, 30 and 40 in a pre-compressed (pre-pressurized) state. The first spring 50 is compressed in association with depression operation of each of the pedals 20, 30 and 40, and applies a reaction force countering the depression operation (hereafter referred to as a "first reaction force") by its elastic force to each of the pedals 20, 30 and 40.
- a reaction force countering the depression operation hereafter referred to as a "first reaction force
- the sensor 60 detects the amount of depression on each of the pedals 20, 30 and 40, and outputs a resistance value corresponding to the amount of depression, and is structured with a lever section 61 that rotational moves in association with depression operation of each of the pedals 20, 30 and 40, and a variable resistor (not shown) that outputs a resistance value corresponding to the amount of rotational movement of the lever section 61, in other words, the amount of depression of each of the pedals 20, 30 and 40. Also, the sensor 60 is mounted on the circuit board 70, and is arranged at each of three positions corresponding to the arranged positions of the pedals 20, 30 and 40.
- the sensor 60 outputs a resistance value corresponding to each of the amounts of depression of the respective pedals 20, 30 and 40, and a voltage value corresponding to the resistance value is outputted to the electronic keyboard apparatus through the connection cable 71.
- sound effect corresponding to the amount of depression of each of the pedals 20, 30 and 40 is applied to musical notes of the electronic keyboard apparatus.
- FIG. 2 is a cross-sectional view of the pedal device 1 taken along a line II - II of FIG. 1
- FIG. 3 is a cross-sectional view of the pedal device 1 taken along a line III - III of FIG. 1
- FIG. 4 (a) is a bottom side perspective view of the first pedal 20
- FIG. 4 (b) is a bottom side perspective view of the third pedal 40.
- arrows U-D, L-R and F-B in FIG. 2 and FIG. 3 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 1, respectively.
- supporting sections 11 are provided on the rear side of the internal space S of the chassis 10 at three locations corresponding to the arranged positions of the first pedal 20, the second pedal 30 and the third pedal 40, respectively.
- the supporting section 11 is a portion for supporting each of the pedals 20, 30 and 40, and is composed of a convex upper supporting section 11a formed on the upper chassis 10a, and a lower supporting section 11b formed on the lower chassis 10b.
- Each of the pedals 20, 30 and 40 is held at their rear end sections between the upper supporting section 11a and the lower supporting section 11b, such that the pedals are rotatably supported on the chassis 10 in a cantilever fashion.
- Opening sections 12 are provided in the front face of the chassis 10 at three locations corresponding to the arranged positions of the first pedal 20, the second pedal 30 and the third pedal 40, respectively.
- the opening sections 12 are portions for exposing the front end sections of the pedals 20, 30 and 40 on the front side of the chassis 10, and are each composed of an upper mouth section 12a formed in an opening in the upper chassis 10a in a generally rectangular shape as viewed in a front view, and a lower mouth section 12b formed in an opening in the lower chassis 10b in a generally rectangular shape as viewed in a front view.
- cushions 13 and 14 are attached to an upper face and a lower face of the opening section 12.
- the cushions 13 and 14 form restriction devices that restrict rotational movements of each of the pedals 20, 30 and 40, and is composed of a shock absorbing material, such as, felt, urethane foam or the like.
- a shock absorbing material such as, felt, urethane foam or the like.
- Each of the pedals 20, 30 and 40 is prevented, upon abutting against the cushion 13 or 14, from further rotational movement, whereby its upper limit position and the lower limit position are set. Also, when each of the pedals 20, 30 and 40 abuts against the cushions 13 and 14, the impact is damped by the cushions 13 and 14. By this, thudding sounds can be suppressed.
- Groove sections 20a, 30a and 40a are provided at the rear end sections of the first pedal 20, the second pedal 30 and the third pedal 40 along the width direction (in the arrowed direction L-R), respectively.
- the groove sections 20a, 30a and 40a are portions that are supported by the supporting portions 11 of the chassis 10, and are each formed as a recess having a generally U-shaped cross section.
- the pedals 20, 30 and 40 rotationally move about the groove sections 20a, 30a and 40 as fulcrums, respectively.
- actuators 21, 31 and 41 are detachably attached to the lower surfaces of the pedals 20, 30 and 40 by screws 15, respectively.
- the actuators 21, 31 and 41 are provided to transfer the amounts of depression of the respective pedals 20, 30 and 40 to the sensor 60 and regulate the amounts of depression, and are each formed from resin material such as POM resin in an elongated plate shape.
- the structure of the actuators 21, 31 and 41 is described in detail. It is noted that the actuator 31 has the same structure as that of the actuator 21, and therefore description of the detailed structure of the actuator 31 is omitted.
- a retaining section 21a, a transmission section 21 b and a stopper section 21c are provided on the bottom face of the actuator 21.
- the retaining section 21a is a portion for retaining the first spring 50, and is provided in a manner to protrude generally in a central section of the actuator 21.
- a first reaction force by the first spring 50 is applied to the first pedal 20 generally at the central section of the actuator 21 where the retaining section 21a is provided.
- the transmission section 21b is a portion for transferring the amount of depression of the first pedal 20 to the sensor 60, and is provided in a manner to protrude at a position opposite to the level section 61 of the sensor 60.
- the transmission section 21b pushes the lever section 61 of the sensor 60 in association with depression operation of the first pedal 20, thereby transferring the amount of depression of the first pedal 20 to the sensor 60.
- a voltage value corresponding to the amount of depression of the first pedal 20 is outputted to the electronic keyboard apparatus.
- the stopper section 21c is a portion for regulating the amount of depression of the first pedal 20, and is provided in a manner to protrude in the front end section of the actuator 21 at a position opposite to the cushion 14.
- the stopper section 21c abuts against the cushion 14, downward rotational movement of the first pedal 20 is restricted, and its lower limit position is restricted. By this, the amount of depression of the first pedal 20 is regulated.
- a retaining section 41a, a transmission section 41 b and a stopper section 41c are provided on the bottom face of the actuator 41.
- the retaining section 41a is a portion for retaining the first spring 50, and is provided generally in a central section of the actuator 41.
- a first reaction force by the first spring 50 is applied to the third pedal 40 generally at the central section of the actuator 41 where the retaining section 41a is provided.
- the retaining section 41a in accordance with the present embodiment also plays a role of a mounting section for mounting the screw 15. By this, an independent mounting section is not required, and thus the number of components can be reduced, whereby the product cost can be reduced.
- the transmission section 41b is a portion for transferring the amount of depression of the third pedal 40 to the sensor 60, and is provided in a manner to protrude at a position opposite to the level section 61 of the sensor 60.
- the transmission section 41 b pushes the lever section 61 of the sensor 60 in association with depression operation of the third pedal 40, thereby transferring the amount of depression of the third pedal 40 to the sensor 60.
- a voltage value corresponding to the amount of depression of the third pedal 40 is outputted to the electronic keyboard apparatus. Accordingly, the relation between the amount of depression of the third pedal 40 and the voltage value outputted to the electronic keyboard apparatus is determined by the shape of the transmission section 41b.
- the relation between the amount of depression of the third pedal 40 and the voltage value to be outputted to the electronic keyboard apparatus can be arbitrarily set.
- the voltage value to be outputted to the electronic keyboard apparatus can be readily interlocked with changes in the operation load of the third pedal 40.
- the transmission section 41 b in accordance with the present embodiment is formed as a sloped surface that tilts downwardly toward the rear end section side of the third pedal 40.
- the stopper section 41c is a portion for regulating the amount of depression of the third pedal 40, and is provided in a manner to protrude in the front end section of the actuator 41 at a position opposite to the cushion 14.
- the stopper section 41c abuts against the cushion 14, downward rotational movement of the third pedal 40 is restricted, and its lower limit position is restricted. By this, the amount of depression of the third pedal 40 is regulated.
- the stopper section 41c is formed in a hollowed out configuration that has an internal space P for mounting a second reaction force application mechanism 42 (or second reaction force application device) therein, and opens in a central section of the bottom face.
- the second reaction force application mechanism 42 is provided to change the operation load of the third pedal 40 during the course of pedal-depression, and is composed of a second spring 43 and a movable stopper 44, which is a part of the second reaction force application device 42.
- the second reaction force application mechanism 42 is mounted inside the internal space P of the stopper section 41c, and therefore is attached together with the actuator 41 to the third pedal 40.
- the second spring 43 applies a reaction force countering depression operation to the third pedal 40, and may be composed of a coil-shaped compression spring. Also, the second spring 43 is retained between the third pedal 40 and the moveable stopper 44 in a pre-compressed (pre-pressurized) state.
- the third pedal 40 is operated and depressed to the extent exceeding a specified amount of depression of the third pedal 40 (hereafter referred to as a "specified amount")
- the second spring 43 is compressed in association with depression operation of the third pedal 40, and applies a reaction force countering the depression operation (hereafter referred to as a "second reaction force") by its elastic force to the third pedal 40.
- the second reaction force is applied by the second spring 43 to the third pedal 40 in the front end section of the actuator 41 where the stopper section 41c is disposed.
- the moveable stopper 44 retains the second spring 43, and is formed from a resin material such as ABS resin in a hollowed out configuration whose top face is opened.
- the moveable stopper 44 is normally urged by the second spring 43, thereby protruding from the bottom face of the stopper section 41 c.
- the moveable stopper 44 abuts against the cushion 14, and when the third pedal 40 is further operated and depressed to the extent exceeding the specified amount, the moveable stopper 44 enters the internal space P of the stopper section 41c while compressing the second spring 43.
- the second spring 43 is stored in the moveable stopper 44.
- the second reaction force application mechanism 42 can be made smaller in size, and the pedal device 1 can be made smaller in size.
- a flange section 44a is provided at an upper edge section of the moveable stopper 44.
- the flange section 44a is a portion for controlling the lower limit position of the moveable stopper 44, and is formed in a manner to protrude in the front-rear and left-right directions.
- a cushion 45 composed of a shock absorbing material such as felt, urethane form or the like is attached to the lower surface of the flange section 44a.
- a guide section 41c is provided in the internal space P of the stopper section 41c.
- the guide section 41c1 is a portion for guiding entry of the moveable stopper 44, and is provided in a manner to extend in the direction of entry thereof.
- the moveable stopper 44 enters the internal space P of the stopper section 41c along the guide section 41c1, whereby its entry is guided. By this, rattling of the moveable stopper 44 can be prevented, and the second spring 43 can be accurately compressed.
- a cover section 41c2 is provided at the front end section of the stopper section 41c.
- the cover section 41c2 is a portion for covering the front side of the moveable stopper 44, and is provided in a manner to protrude downwardly.
- the moveable stopper 44 is covered by the cover section 41c2, such that the exterior appearance can be improved, and the moveable stopper 44 can be protected from external factors such as penetration of dusts, insertion of the fingers or the like.
- the second reaction force application mechanism 42 is fitted in the stopper section 41 c, and attached to the third pedal 40 in one piece with the actuator 41, such that the second reaction force application mechanism 42 can be effectively arranged, and the pedal device 1 can be made smaller in size. Also, as the second reaction force application mechanism 42 is attached to the third pedal 40 in one piece with the actuator 41, the second reaction force application mechanism 42 together with the actuator 41 can be attached to the third pedal 40, such that the work efficiency can be improved.
- the second reaction force application mechanism 42 may be provided by replacing the actuator 41, whereby a feeling of operation similar to that created by the damper pedal of an acoustic piano can be realized.
- FIGs. 5a and 5b are cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line II - II of FIG. 1 , wherein FIG. 5a shows an initial state of the first pedal and FIG. 5b shows a depressed state of the first pedal.
- FIGs. 6a, 6b, 6c are cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line III - III of FIG. 1 , wherein FIG. 6a shows an initial state of the third pedal, FIG.
- FIG. 6b shown a specified state of the third pedal
- FIG. 6c shows a depressed state of the third pedal. It is noted that, in FIGs. 5a, 5b , 6a, 6b, and 6c , only those of the components necessary for describing the actions that take place when each of the pedals is depression-operated are appended with reference numerals, and the other components are illustrated without reference numerals.
- the first pedal 20 When the first pedal 20 is depression-operated from the initial state shown in FIG. 5a (in the state in which the first pedal 20 is at the upper limit position), the first pedal 20 rotationally moves downwardly about the groove section 20a as a fulcrum supported by the supporting section 11 of the chassis 10.
- the lever section 61 of the sensor 60 As the lever section 61 of the sensor 60 is pushed by the transmission section 21b of the actuator 21, the amount of depression of the first pedal 20 is detected by the sensor 60.
- a voltage value corresponding to the amount of depression of the first pedal 20 is outputted to the electronic keyboard apparatus, whereby a sound effect similar to that of the soft pedal of an acoustic piano is given to musical sounds of the electronic keyboard apparatus.
- the first reaction force countering the depression operation is applied by the first spring 50 to the first pedal 20.
- a voltage value corresponding to the amount of depression of the third pedal 40 is outputted to the electronic keyboard apparatus, whereby a sound effect similar to that of the damper pedal of an acoustic piano is given to musical sounds of the electronic keyboard apparatus. Also, in this case, the first reaction force countering the depression operation is applied by the first spring 50 to the third pedal 40.
- FIG. 7 is a graph showing the relation between the amounts of depression of the first pedal 20, the second pedal 30 and the third pedal 40, and their operation loads and voltage values outputted to the electronic keyboard apparatus.
- a solid line F1, 2 in FIG. 7 indicates the relation between the amounts of depression of the first pedal 20 and the second pedal 30 and their operation loads
- a solid line F3 indicates the relation between the amount of depression of the third pedal 40 and its operation load
- a broken line V indicates the relation between the amount of depression of each of the pedals 20, 30 and 40 and the voltage value outputted to the electronic keyboard apparatus.
- the relation between the amounts of depression of the first pedal 20, the second pedal 30 and the third pedal 40 and their operation loads is described. Only the first reaction force by the first spring 50 is applied to the first pedal 20 and the second pedal 30 from the initial state to the depressed state. Therefore, the operation load of each of the pedals 20 and 30 linearly increases with the amount of depression, as indicated by the solid line F1, 2. It is noted that the first spring 50 is pre-compressed (pre-pressurized), such that a reaction force according to the compression amount is applied to each of the pedals 20 and 30 at the start of the depression operation.
- the operation load of the third pedal 40 changes during the course of depression, as indicated by the solid line F3. More specifically, the operation load of the third pedal 40 linearly increases with the amount of depression from the initial state to the specified state (in the range indicated as the period A) because only the first reaction force by the first spring 50 is applied.
- the first spring 50 is pre-compressed (pre-pressurized), such that a reaction force according to the compression amount is applied to the third pedal 40 at the start of the depression operation. Then, upon reaching the specified state, the second reaction force by the second spring 43 in addition to the first reaction force by the first spring 50 are applied to the third pedal 40, such that the operation load of the third pedal 40 linearly changes according to the amount of depression at a greater change rate than that during the period from the initial state to the specified state. In this case, as the second spring 43 is pre-compressed (pre-pressurized), a reaction force according to the compressed amount is applied to the third pedal 40 when it reaches the specified state.
- the pedal device 1 is provided with the third pedal 40 whose operation load changes in a stepwise fashion according to the amount of depression together with the first pedal 20 and the second pedal 30 whose operation load is constant regardless of the amount of depression, whereby differences are given to the pedal operation feelings.
- the voltage value to be outputted to the electronic keyboard apparatus linearly increases with the amount of depression, when the amount of depression exceeds a predetermined amount of depression of each of the pedals 20, 30 and 40, as indicated by the broken line V.
- the pedal device 1 in accordance with the present embodiment is equipped with the first spring 50 that applies the first reaction force countering the depression operation to the third pedal 40, and the second reaction force application mechanism 42 that applies the second reaction force countering the depression operation to the third pedal 40 when the amount of depression of the third pedal 40 exceeds the specified amount, such that the operation load of the third pedal 40 can be changed in a stepwise fashion according to the amount of depression. Accordingly, a feeling of operation similar to that of the damper pedal of an acoustic piano can be realized.
- the first spring 50 is provided between the supporting position of the third pedal 40 supported by the chassis 10 and the operation position of the third pedal 40 that is operated through depression by the performer, and applies the first reaction force to the third pedal 40 at a position between the supporting position and the operation position.
- the second reaction force application mechanism 42 is provided between the first spring 50 and the operation position, and applies the second reaction force to the third pedal 40 at a location between the first spring 50 and the operation position of the third pedal 40. Therefore the position of the second reaction force application mechanism 42 is set farther from the supporting position of the third pedal 40 and closer to the operation position, such that the elastic force necessary for the second reaction force application mechanism 42 can be made smaller. By this, the second reaction force application mechanism 42 can be made smaller in size and the pedal device 1 can be made smaller in size.
- the second reaction force application mechanism 42 can be made smaller in size, and lowering of the accuracy in the elastic force can be suppressed. By this, the operation load accuracy of the third pedal 40 can be improved.
- the second reaction force application mechanism 42 is disposed opposite to the cushion 14 that is provided between the first spring 50 and the operation position of the third pedal 40. Upon abutting against the cushion 14 when the depression amount of the third pedal 40 exceeds a specified amount, the second reaction force application mechanism 42 is compressed in association with the depression operation of the third pedal 40.
- the backlash can be accurately set for individual pedal devices 1 manufactured.
- FIG. 8 is a cross-sectional view of the pedal device 201 of an electronic keyboard apparatus in accordance with the second embodiment. It is noted that arrows U-D, L-R and F-B in FIG. 8 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 201 of the electronic keyboard apparatus, respectively.
- the second reaction force application mechanism 42 is fitted in the stopper section 41c of the actuator 41.
- a second reaction force application mechanism 242 (or second reaction force application device) is fitted in a chassis 210. It is noted that the same components as those of the first embodiment are appended with the same reference numbers, and their description is omitted.
- the pedal device 201 in accordance with the second embodiment has a main body that is formed from a chassis 210.
- a fitting section 216 is provided below an opening section 12 of the chassis 210.
- the fitting section 216 is formed in a hollowed out configuration that has an internal space R for fitting a second reaction force application mechanism 242, and an upper face being open at its central section.
- the second reaction force application mechanism 242 is to change the operation load of the third pedal 40 during the course of depression, and is composed of a second spring 43 and a moveable stopper 44.
- the second reaction force application mechanism 242 is fitted in the internal space R of the fitting section 216, and retained by a plate 217 that is attached to the lower face of the chassis 210.
- the second spring 43 is retained between the plate 217 and the moveable stopper 44 in a pre-compressed (pre-pressurized) state.
- the moveable stopper 44 is normally urged by the second spring 43, thereby protruding from the upper face of the fitting section 216.
- the third pedal 40 is depression-operated to the extent exceeding a specified amount, the moveable stopper 44 enters the internal space R of the fitting section 216 while compressing the second spring 43.
- An actuator 241 is attached to the bottom surface of the third pedal 40.
- the actuator 241 has a stopper section 241c whose shape is different from that of the actuator 41 of the first embodiment, and the internal space P is omitted.
- a cushion 14 is attached to the bottom face of the stopper section 241c.
- the third pedal 40 abuts against the fitting section 216 of the chassis 210 through the cushion 14, whereby its downward rotational movement is restricted, and its lower limit position is restricted. By this, the amount of depression of the third pedal 40 is regulated.
- FIG. 9 is a cross-sectional view of the pedal device 301 of an electronic keyboard apparatus in accordance with the third embodiment. It is noted that arrows U-D, L-R and F-B in FIG. 9 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 301 of the electronic keyboard apparatus, respectively.
- the second reaction force application mechanism 42 is composed of the second spring 43 and the moveable stopper 44.
- a second reaction force application mechanism 342 (or second reaction force application device) is composed of a second spring 343 (or a part of the second reaction force application device).
- the pedal device 301 in accordance with the third embodiment has an actuator 341 that is attached to the bottom surface of the third pedal 40.
- the actuator 341 has a stopper section 341c whose shape is different from that of the actuator 41 of the first embodiment. More specifically, the stopper section 341c is formed in a hollowed out configuration that has an internal space P for fitting the second reaction force application mechanism 342 and is opened at its front and bottom faces.
- the second reaction force application mechanism 342 is to change the operation load of the third pedal 40 during the course of depression, and is composed of the second spring 343. This second reaction force application mechanism 342 is fitted in the internal space P of the stopper section 341 c, thereby being attached to the third pedal 40 in one piece with the actuator 341.
- the second spring 343 applies a reaction force countering the depression operation to the third pedal 40, is composed of a leaf spring formed by bending a metal plate material such as a stainless steel plate, and is retained between the third pedal 40 and the stopper section 341c of the actuator 341 in a pre-compressed (a pre-pressurized) state.
- the second spring 343 is compressed in association with the depression operation of the third pedal 40 when the third pedal 40 is depression-operated to the extent exceeding a specified amount, thereby applying a second reaction force countering the depression operation to the third pedal 40.
- the second spring 343 is provided with a convex section 343a.
- the convex section 343a is a portion that abuts against the cushion 14 when the third pedal 40 is depression-operated to the extent exceeding the specified amount, and is formed in a downwardly protruding convex shape.
- the convex section 343a normally protrudes from the bottom face of the stopper section 341 c, abuts against the cushion 14 when the amount of depression of the third pedal 40 reaches the specified amount, and enters the internal space P of the stopper section 341c while compressing the second spring 343 when the third pedal 40 is depression-operated to the extent exceeding the specified amount of the third pedal 40.
- the second spring 343 is provided with a restriction section 343b for restricting the lower limit position of the second spring 343.
- a restriction section 343b for restricting the lower limit position of the second spring 343.
- a cushion 345 composed of shock absorbing material, such as, felt, urethane form or the like is attached to the bottom face of the restriction section 343b.
- the restriction section 343b abuts against the inner bottom face of the stopper section 341c through the cushion 345, whereby the impact of the second spring 343 is alleviated. By this, thudding sounds can be suppressed.
- the second reaction force application mechanism 342 is composed only of the second spring 343, such that the number of components can be reduced, and the pedal device 301 can be made smaller in size.
- first pedal 20, the second pedal 30 and the third pedal 40 are each formed from a metal material such as brass, iron steel and the like into an elongated plate shape.
- metal material such as brass, iron steel and the like
- resin material such as ABS resin, POM resin or the like may be formed into an elongated plate shape.
- the pedal devices 1, 201 and 301 are each formed with three pedals, i.e., the first pedal 20, the second pedal 30 and the third pedal 40 are described.
- they may each be formed only from the third pedal 40, or may be formed from two pedals, for example, the first pedal 20 or the second pedal 30 and the third pedal 40, or may be formed from four or more pedals including the third pedal 40.
- first pedal 20 and the second pedal 30 correspond to the soft pedal and the sostenuto pedal of an acoustic piano, respectively, and are structured to give sound effects similar to those of the soft pedal and the sostenuto pedal to musical sounds of an electronic keyboard apparatus.
- they can be structured to give other sound effects different from those of the soft pedal and the sostenuto pedal to musical sounds of the electronic keyboard apparatus.
- the description is made as to examples in which the second spring 43 that applies the second reaction force to the third pedal 40 is formed from a coil-shaped compression spring, and the second spring 343 is formed from a leaf spring.
- the other elastic material for example, an elastic member composed of rubber elastic material, resin material or the like may be exemplified.
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Description
- The present invention relates to a pedal device for an electronic keyboard instrument.
- In recent years, electronic keyboard apparatuses such as electronic pianos and the like that spuriously reproduce the tone colors, the maneuverability, the external appearance and the like of acoustic pianos have gained popularity. As a pedal device used for an electronic keyboard apparatus of the type described above, Japanese Laid-open Patent Application, Publication No.
JP2004-334008 - However, while the pedal device described in Japanese Patent Application, Publication No.
JP2004-334008 US 2009/0314156 A1 , which discloses a pedal device for an electronic keyboard apparatus to add sound effects to musical notes generated by the electronic keyboard apparatus in response to an operator depressing the pedal device, comprising at least one pedal that is moved in response to a depression operation, a first reaction force application device that is configured to apply a first reaction force countering a depression of the pedal by the operator from an initial state to a specified state, wherein the first reaction force increases as the pedal is depressed from the initial state to the specified state, and a second reaction force application device that is configured to apply a second reaction force countering a depression of the pedal by the operator after the specified state , wherein after the specified state the first reaction force and the second reaction force are applied to the pedal. - Further pedal devices are, e.g., known from
US2009/0235803 A1 andUS54744279. - The invention provides a pedal device according to
claim 1 and a pedal device according toclaim 2. Further embodiments of the invention are described in the dependent claims. A pedal device used by a performer of an electronic keyboard apparatus includes a pedal that is moved in response to a depression operation from the performer; a chassis that rotationally supports the pedal according to the depression operation to move the pedal downwardly about a supporting position supported by the chassis; a first reaction force application device that applies a first reaction force countering the depression operation of the pedal to the pedal; and a second reaction force application device that is pre-compressed in a state in which the amount of depression of the pedal does not reach a specified amount, and is compressed in association with the depression operation of the pedal when the amount of depression of the pedal exceeds the specified amount, wherein the second reaction force application device applies a second reaction force with an elastic force countering the depression operation to the pedal. The first reaction force application device is located between the supporting position of the pedal and the operation position, and wherein the first reaction force is applied to the pedal at a position between the supporting position and the operation position. The second reaction force application device is located between a position of the first reaction force application device and the operation position, and wherein the second reaction force application device applies the second reaction force to the pedal at a position between a position of the first reaction force application device and the operation position. -
-
FIG. 1 illustrates an exploded perspective view of a pedal device of an electronic keyboard apparatus in accordance with an embodiment of the invention. -
FIG. 2 illustrates a cross-sectional view of the pedal device of an electronic keyboard apparatus taken along a line II - II ofFIG. 1 . -
FIG. 3 illustrates a cross-sectional view of the pedal device of an electronic keyboard apparatus taken along a line III - III ofFIG. 1 . -
FIG. 4a illustrates a bottom side perspective view of a first pedal. -
FIG. 4b illustrates a bottom side perspective view of a third pedal. -
FIGs. 5a and 5b show cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line II - II ofFIG. 1 , whereinFIG. 5a shows an initial state of the first pedal, andFIG. 5b shows a depressed state of the first pedal. -
FIGs. 6a, 6b, 6c illustrate cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line III - III ofFIG. 1 , whereinFIG. 6a illustrates an initial state of the third pedal,FIG. 6b illustrates a specified state of the third pedal, andFIG. 6c illustrates a depressed state of the third pedal. -
FIG. 7 illustrates a graph showing the relation between the amounts of depression of the first pedal, the second pedal and the third pedal, and their operation loads and voltage values outputted to the electronic keyboard apparatus. -
FIG. 8 illustrates a cross-sectional view of a pedal device of an electronic keyboard apparatus in accordance with a second embodiment. -
FIG. 9 illustrates a cross-sectional view of a pedal device of an electronic keyboard apparatus in accordance with a third embodiment. - The described embodiments provide a pedal device of an electronic keyboard apparatus, capable of reducing the size thereof, while realizing a feeling of operation similar to that of the damper pedal of an acoustic piano.
- A pedal device of an electronic keyboard apparatus is equipped with a first reaction force application device that gives a first reaction force countering a depression operation to the pedal, and a second reaction force application device that is compressed in association with the depression operation of the pedal when the amount of depression exceeds a specified amount, and applies a second reaction force with an elastic force countering the depression operation to the pedal, such that the operation load of the pedal can be changed in a stepwise fashion according to the amount of depression. Therefore, it is possible to realize a feeling of operation similar to that given by the damper pedal of an acoustic piano.
- Further, the first reaction force application device is provided between a supporting position of the pedal supported by a chassis and an operation position of the pedal that is operated through depression by the performer. The first reaction force application device applies the first reaction force to the pedal at a location between the supporting position and the operation position. The second reaction force application device is provided between a position of the first reaction force application device and the operation position of the pedal. Further, the second reaction force application device applies the second reaction force to the pedal at a location between the arranged position of the first reaction force application device and the operation position. This is effective in making the second reaction force application device smaller in size and making the pedal device smaller in size.
- In other words, the elastic force of the second reaction force application device that is necessary for applying the second reaction force to the pedal may become smaller, based on the principle of leverage, when the second reaction force application device is located farther from the supporting position of the pedal and closer to the operation position, and may become greater as it is located farther from the operation position of the pedal and closer to the supporting position. For this reason, if the second reaction force is applied to the pedal at a position between the arranged position of the first reaction force application device and the supporting position, then the second reaction force application device needs a greater elastic force, which, as a result, causes the second reaction force application device to become larger in size. In other words, when the second reaction force application device is to be formed from a coil spring, its coil wire needs to be thicker or the coil outer diameter needs to be larger.
- In contrast, by applying the second reaction force to the pedal at a position between the arranged position of the first reaction force application device and the operation position, then the second reaction force application device has a position set farther from the supporting position of the pedal and closer to the operation position, which allows the elastic force required for the second reaction force application device to be made smaller. By this, the second reaction force application device can be made smaller in size, and the pedal device can be made smaller.
- Also, by applying the second reaction force to the pedal at a position between the arranged position of the first reaction force application device and the operation position, then the accuracy in the pedal operation load can be improved.
- More specifically, if the second reaction force is applied to the pedal at a position between the arranged position of the first reaction force application device and the supporting position, then the second reaction force application device becomes larger in size, and the accuracy in its elastic force is lowered. In other words, for example, when the second reaction force application device is formed from a coil spring, and its coil wire is made thicker or the outer coil diameter is made larger, its load accuracy also lowers. As a result, differences would likely occur in the pedal operation load accuracy from one device manufactured to another.
- In contrast, by applying the second reaction force at a position between the arranged position of the first reaction force application device and the operation position, the second reaction force application device can be made smaller in size, and lowering of the accuracy in its elastic force can be suppressed. By this, the pedal operation load accuracy for each of the pedal devices manufactured can be improved.
- In addition to the effects obtained by the pedal device of an electronic keyboard apparatus of the described embodiments, the pedal device may be equipped with a restriction device that is provided at a position between the arranged position of the first reaction force application device and the operation position of the pedal and restricts a lower limit position of the pedal by restricting rotational movement of the pedal. The second reaction force application device is disposed opposite to the restriction device, and compressed in association with the depression operation of the pedal upon abutting against the restriction device when the amount of depression of the pedal exceeds a specified amount, which is effective in that the amount of depression (the specified amount) of the pedal until the second reaction force is applied to the pedal can be accurately set.
- More specifically, the amount of depression (the specified amount) of the pedal until the second reaction force is applied to the pedal, or a so-called backlash, is desired to have a high accuracy when the performer performs while placing his foot on the pedal, or for a depression operation called half-pedaling. Such a backlash is difficult to be influenced by the dimensional accuracy of the second reaction force application device (the dimensional accuracy in the direction in which the pedal is depressed) when the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the operation position, and the accuracy is higher. On the other hand, the backlash would readily be influenced by the dimensional accuracy of the second reaction force application device when the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the supporting position, and the accuracy would become lower. For this reason, if the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the supporting position, differences in the backlash would likely occur in individual devices manufactured.
- In contrast, by disposing the second reaction force application device at a position between the arranged position of the first reaction force application device and the operation position, the backlash can be made more difficult to be influenced by the dimensional accuracy of the second reaction force application device, whereby differences in the backlash can be suppressed. By this, backlash can be accurately set for each of the individual apparatuses manufactured.
- In further embodiments, the pedal device may be equipped with an actuator that is removably attached to the pedal and has a stopper section disposed opposite to the restriction device in a state of the actuator being attached to the pedal. The second reaction force application device is fitted inside the stopper section. Therefore, the stopper section can be used as a storage space for the second reaction force application device, which is effective in making the device smaller in size. Also, the second reaction force application device is attached to the pedal in one piece with the actuator, such that the second reaction force application device, together with the actuator, can be attached to the pedal. This is effective in improving the workability. Furthermore, even if the pedal is not equipped with the second reaction force application device, the second reaction force application device can be provided thereon by replacing the actuator, and feeling of operation similar to that provided by the damper pedal of an acoustic piano can be realized.
- In further embodiments, the pedal device may be equipped with a sensor that detects the amount of depression of the pedal based on the amount of rotational movement of the pedal, and is structured to output an electrical signal to the electronic keyboard apparatus according to a detection result of the sensor, wherein the actuator is equipped with a transmission section that transfers the amount of rotational movement of the pedal to the sensor. Therefore, by suitably changing the shape of the transmission section, the relation between the amount of depression of the pedal and the electrical signal to be outputted to the electronic keyboard apparatus can be arbitrarily set. Accordingly, it is effective in that the electrical signal to be outputted to the electronic keyboard apparatus can be readily interlocked with changes in the operation load of the pedal.
- In further embodiments, the pedal device may be equipped with a plurality of pedals, and is equipped with the second reaction force application device for at least one of the plurality of pedals. A pedal whose operation load changes in a stepwise fashion according to the amount of depression and a pedal whose operational load is constant regardless of the amount of depression of the pedal can be co-existed, such that a single device can be provided with the pedals having feelings of operation different from one another.
- The described embodiments relate to a pedal device for an electronic keyboard instrument and, in particular to a pedal device of an electronic keyboard instrument that is capable of reducing the size thereof, while realizing a feeling of operation similar to that of the damper pedal of an acoustic piano.
- The embodiments of the invention are described with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of apedal device 1 of an electronic keyboard apparatus in accordance with an embodiment of the invention. It is noted that arrows U-D, L-R and F-B inFIG. 1 indicate an up-down direction, a left-right direction and a front-back direction of thepedal device 1 of the electronic keyboard apparatus, respectively. - First, referring to
FIG. 1 , a general structure of thepedal device 1 of the electronic keyboard apparatus (hereafter simply referred to as the "pedal device 1") is described. Thepedal device 1 is used for an electronic keyboard apparatus, such as, an electronic piano or the like (not shown), and is a device for adding various types of sound effects to musical notes generated by the electronic keyboard apparatus. As shown inFIG. 1 , thepedal device 1 is mainly equipped with achassis 10 composing a main body, and afirst pedal 20, asecond pedal 30 and athird pedal 40 arranged side by side in the left-right direction of thechassis 10. As the performer depresses and operates each of thepedals pedal device 1 outputs a voltage value corresponding to the amount of depression to the electronic keyboard apparatus, and is structured to give sound effects similar to those created by a soft pedal, a sostenuto pedal and a damper pedal of an acoustic piano to musical notes of the electronic keyboard apparatus. - The
chassis 10 is composed of anupper chassis 10a (also referred to herein as a part of the chassis) and alower chassis 10b (also referred to herein as a part of the chassis) formed from resin material such as ABS resin. Theupper chassis 10a and thelower chassis 10b are parts of the chassis superposed and assembled together into a hollow box shape having an internal space S for mounting afirst spring 50, asensor 60 and acircuit board 70 therein. Aconnection cable 71 extends from thecircuit board 70 for connecting thepedal device 1 to the electronic keyboard apparatus. - The
first pedal 20, thesecond pedal 30 and thethird pedal 40 correspond to a soft pedal, a sostenuto pedal and a damper pedal of an acoustic piano, respectively, and are each formed from metal material such as brass, iron steel and the like into an elongated plate shape. Also, thepedals chassis 10, and front end sections that are exposed on the front side of thechassis 10. Each of thepedals chassis 10. - A
first spring 50 applies a reaction force countering a depression operation to each of thepedals first spring 50 is arranged at each of thepedals chassis 10 and each of thepedals first spring 50 is compressed in association with depression operation of each of thepedals pedals - The
sensor 60 detects the amount of depression on each of thepedals lever section 61 that rotational moves in association with depression operation of each of thepedals lever section 61, in other words, the amount of depression of each of thepedals sensor 60 is mounted on thecircuit board 70, and is arranged at each of three positions corresponding to the arranged positions of thepedals sensor 60 outputs a resistance value corresponding to each of the amounts of depression of therespective pedals connection cable 71. As a result, sound effect corresponding to the amount of depression of each of thepedals - Next, referring to
FIG. 1 through FIG. 4 , the detailed structure of each of the components of thepedal device 1 is described.FIG. 2 is a cross-sectional view of thepedal device 1 taken along a line II - II ofFIG. 1 , andFIG. 3 is a cross-sectional view of thepedal device 1 taken along a line III - III ofFIG. 1 .FIG. 4 (a) is a bottom side perspective view of thefirst pedal 20, andFIG. 4 (b) is a bottom side perspective view of thethird pedal 40. It is noted that arrows U-D, L-R and F-B inFIG. 2 andFIG. 3 indicate an up-down direction, a left-right direction and a front-back direction of thepedal device 1, respectively. - As shown in
FIG. 1 through FIG. 3 , supportingsections 11 are provided on the rear side of the internal space S of thechassis 10 at three locations corresponding to the arranged positions of thefirst pedal 20, thesecond pedal 30 and thethird pedal 40, respectively. The supportingsection 11 is a portion for supporting each of thepedals upper supporting section 11a formed on theupper chassis 10a, and a lower supportingsection 11b formed on thelower chassis 10b. Each of thepedals section 11a and the lower supportingsection 11b, such that the pedals are rotatably supported on thechassis 10 in a cantilever fashion. - Opening
sections 12 are provided in the front face of thechassis 10 at three locations corresponding to the arranged positions of thefirst pedal 20, thesecond pedal 30 and thethird pedal 40, respectively. The openingsections 12 are portions for exposing the front end sections of thepedals chassis 10, and are each composed of anupper mouth section 12a formed in an opening in theupper chassis 10a in a generally rectangular shape as viewed in a front view, and alower mouth section 12b formed in an opening in thelower chassis 10b in a generally rectangular shape as viewed in a front view. Also, cushions 13 and 14 are attached to an upper face and a lower face of theopening section 12. Thecushions pedals pedals cushion pedals cushions cushions -
Groove sections first pedal 20, thesecond pedal 30 and thethird pedal 40 along the width direction (in the arrowed direction L-R), respectively. Thegroove sections portions 11 of thechassis 10, and are each formed as a recess having a generally U-shaped cross section. Thepedals groove sections pedals screws 15, respectively. Theactuators respective pedals sensor 60 and regulate the amounts of depression, and are each formed from resin material such as POM resin in an elongated plate shape. - Here, referring to
FIGS. 2 and4 , the structure of theactuators actuator 31 has the same structure as that of theactuator 21, and therefore description of the detailed structure of theactuator 31 is omitted. - As shown in
FIG. 2 andFIG. 4a , a retainingsection 21a, atransmission section 21 b and astopper section 21c are provided on the bottom face of theactuator 21. The retainingsection 21a is a portion for retaining thefirst spring 50, and is provided in a manner to protrude generally in a central section of theactuator 21. A first reaction force by thefirst spring 50 is applied to thefirst pedal 20 generally at the central section of theactuator 21 where the retainingsection 21a is provided. - The
transmission section 21b is a portion for transferring the amount of depression of thefirst pedal 20 to thesensor 60, and is provided in a manner to protrude at a position opposite to thelevel section 61 of thesensor 60. Thetransmission section 21b pushes thelever section 61 of thesensor 60 in association with depression operation of thefirst pedal 20, thereby transferring the amount of depression of thefirst pedal 20 to thesensor 60. As a result, a voltage value corresponding to the amount of depression of thefirst pedal 20 is outputted to the electronic keyboard apparatus. - The
stopper section 21c is a portion for regulating the amount of depression of thefirst pedal 20, and is provided in a manner to protrude in the front end section of theactuator 21 at a position opposite to thecushion 14. When thestopper section 21c abuts against thecushion 14, downward rotational movement of thefirst pedal 20 is restricted, and its lower limit position is restricted. By this, the amount of depression of thefirst pedal 20 is regulated. - As shown in
FIG. 3 andFIG. 4b , a retainingsection 41a, atransmission section 41 b and astopper section 41c are provided on the bottom face of theactuator 41. The retainingsection 41a is a portion for retaining thefirst spring 50, and is provided generally in a central section of theactuator 41. A first reaction force by thefirst spring 50 is applied to thethird pedal 40 generally at the central section of theactuator 41 where the retainingsection 41a is provided. It is noted that the retainingsection 41a in accordance with the present embodiment also plays a role of a mounting section for mounting thescrew 15. By this, an independent mounting section is not required, and thus the number of components can be reduced, whereby the product cost can be reduced. - The
transmission section 41b is a portion for transferring the amount of depression of thethird pedal 40 to thesensor 60, and is provided in a manner to protrude at a position opposite to thelevel section 61 of thesensor 60. Thetransmission section 41 b pushes thelever section 61 of thesensor 60 in association with depression operation of thethird pedal 40, thereby transferring the amount of depression of thethird pedal 40 to thesensor 60. As a result, a voltage value corresponding to the amount of depression of thethird pedal 40 is outputted to the electronic keyboard apparatus. Accordingly, the relation between the amount of depression of thethird pedal 40 and the voltage value outputted to the electronic keyboard apparatus is determined by the shape of thetransmission section 41b. Therefore, by suitably changing the shape of thetransmission section 41b, the relation between the amount of depression of thethird pedal 40 and the voltage value to be outputted to the electronic keyboard apparatus can be arbitrarily set. By this, the voltage value to be outputted to the electronic keyboard apparatus can be readily interlocked with changes in the operation load of thethird pedal 40. Thetransmission section 41 b in accordance with the present embodiment is formed as a sloped surface that tilts downwardly toward the rear end section side of thethird pedal 40. By this, only by changing the tilt angle of thetransmission section 41b, the relation between the amount of depression of thethird pedal 40 and the voltage value to be outputted to the electronic keyboard apparatus can be readily set. - The
stopper section 41c is a portion for regulating the amount of depression of thethird pedal 40, and is provided in a manner to protrude in the front end section of theactuator 41 at a position opposite to thecushion 14. When thestopper section 41c abuts against thecushion 14, downward rotational movement of thethird pedal 40 is restricted, and its lower limit position is restricted. By this, the amount of depression of thethird pedal 40 is regulated. - Also, the
stopper section 41c is formed in a hollowed out configuration that has an internal space P for mounting a second reaction force application mechanism 42 (or second reaction force application device) therein, and opens in a central section of the bottom face. The second reactionforce application mechanism 42 is provided to change the operation load of thethird pedal 40 during the course of pedal-depression, and is composed of asecond spring 43 and amovable stopper 44, which is a part of the second reactionforce application device 42. The second reactionforce application mechanism 42 is mounted inside the internal space P of thestopper section 41c, and therefore is attached together with theactuator 41 to thethird pedal 40. - The
second spring 43 applies a reaction force countering depression operation to thethird pedal 40, and may be composed of a coil-shaped compression spring. Also, thesecond spring 43 is retained between thethird pedal 40 and themoveable stopper 44 in a pre-compressed (pre-pressurized) state. When thethird pedal 40 is operated and depressed to the extent exceeding a specified amount of depression of the third pedal 40 (hereafter referred to as a "specified amount"), thesecond spring 43 is compressed in association with depression operation of thethird pedal 40, and applies a reaction force countering the depression operation (hereafter referred to as a "second reaction force") by its elastic force to thethird pedal 40. The second reaction force is applied by thesecond spring 43 to thethird pedal 40 in the front end section of theactuator 41 where thestopper section 41c is disposed. - The
moveable stopper 44 retains thesecond spring 43, and is formed from a resin material such as ABS resin in a hollowed out configuration whose top face is opened. Themoveable stopper 44 is normally urged by thesecond spring 43, thereby protruding from the bottom face of thestopper section 41 c. When the amount of depression of thethird pedal 40 reaches the specified amount, themoveable stopper 44 abuts against thecushion 14, and when thethird pedal 40 is further operated and depressed to the extent exceeding the specified amount, themoveable stopper 44 enters the internal space P of thestopper section 41c while compressing thesecond spring 43. Also, when thethird pedal 40 is operated and depressed to the extent exceeding the specified amount, thesecond spring 43 is stored in themoveable stopper 44. In this manner, by forming themoveable stopper 44 in a hollowed out configuration and using the internal space thereof as a space for storing thesecond spring 43, the second reactionforce application mechanism 42 can be made smaller in size, and thepedal device 1 can be made smaller in size. - A
flange section 44a is provided at an upper edge section of themoveable stopper 44. Theflange section 44a is a portion for controlling the lower limit position of themoveable stopper 44, and is formed in a manner to protrude in the front-rear and left-right directions. When theflange section 44a abuts against the inner bottom face of thestopper section 41c, downward movement of themoveable stopper 44 is restricted, whereby its lower limit position is restricted. Also, acushion 45 composed of a shock absorbing material such as felt, urethane form or the like is attached to the lower surface of theflange section 44a. As theflange section 44a abuts against the inner bottom face of thestopper section 41c through thecushion 45, impacts thereof can be alleviated. By this, thudding sounds can be suppressed. - A
guide section 41c is provided in the internal space P of thestopper section 41c. The guide section 41c1 is a portion for guiding entry of themoveable stopper 44, and is provided in a manner to extend in the direction of entry thereof. Themoveable stopper 44 enters the internal space P of thestopper section 41c along the guide section 41c1, whereby its entry is guided. By this, rattling of themoveable stopper 44 can be prevented, and thesecond spring 43 can be accurately compressed. - Also, a cover section 41c2 is provided at the front end section of the
stopper section 41c. The cover section 41c2 is a portion for covering the front side of themoveable stopper 44, and is provided in a manner to protrude downwardly. Themoveable stopper 44 is covered by the cover section 41c2, such that the exterior appearance can be improved, and themoveable stopper 44 can be protected from external factors such as penetration of dusts, insertion of the fingers or the like. - In this manner, the second reaction
force application mechanism 42 is fitted in thestopper section 41 c, and attached to thethird pedal 40 in one piece with theactuator 41, such that the second reactionforce application mechanism 42 can be effectively arranged, and thepedal device 1 can be made smaller in size. Also, as the second reactionforce application mechanism 42 is attached to thethird pedal 40 in one piece with theactuator 41, the second reactionforce application mechanism 42 together with theactuator 41 can be attached to thethird pedal 40, such that the work efficiency can be improved. Furthermore, even if the pedal (thefirst pedal 20 or the second pedal 30) is not equipped with the second reactionforce application mechanism 42, the second reactionforce application mechanism 42 may be provided by replacing theactuator 41, whereby a feeling of operation similar to that created by the damper pedal of an acoustic piano can be realized. - Next, referring to
FIGs. 5a, 5b ,6a, 6b, and 6c , actions of thefirst pedal 20, thesecond pedal 30 and thethird pedal 40 that take place at the time of depression operation thereof are described.FIGs. 5a and 5b are cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line II - II ofFIG. 1 , whereinFIG. 5a shows an initial state of the first pedal andFIG. 5b shows a depressed state of the first pedal. Also,FIGs. 6a, 6b, 6c are cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line III - III ofFIG. 1 , whereinFIG. 6a shows an initial state of the third pedal,FIG. 6b shown a specified state of the third pedal, andFIG. 6c shows a depressed state of the third pedal. It is noted that, inFIGs. 5a, 5b ,6a, 6b, and 6c , only those of the components necessary for describing the actions that take place when each of the pedals is depression-operated are appended with reference numerals, and the other components are illustrated without reference numerals. - First, referring to
FIGs. 5a and 5b , actions that take place as thefirst pedal 20 is depression-operated are described. It is noted that, because the actions that take place upon depression operation of thesecond pedal 30 are similar to the actions that take place upon depression operation of thefirst pedal 20, description of the actions that take place upon depression operation of thesecond pedal 30 is omitted. - When the
first pedal 20 is depression-operated from the initial state shown inFIG. 5a (in the state in which thefirst pedal 20 is at the upper limit position), thefirst pedal 20 rotationally moves downwardly about thegroove section 20a as a fulcrum supported by the supportingsection 11 of thechassis 10. In this case, as thelever section 61 of thesensor 60 is pushed by thetransmission section 21b of theactuator 21, the amount of depression of thefirst pedal 20 is detected by thesensor 60. As a result, a voltage value corresponding to the amount of depression of thefirst pedal 20 is outputted to the electronic keyboard apparatus, whereby a sound effect similar to that of the soft pedal of an acoustic piano is given to musical sounds of the electronic keyboard apparatus. Also, in this case, the first reaction force countering the depression operation is applied by thefirst spring 50 to thefirst pedal 20. By this, a feeling of operation similar to that of the soft pedal of an acoustic piano can be given to the performer. - Then, upon reaching the depressed state shown in
FIG. 5b (in the state in which thefirst pedal 20 is at the lower limit position), thestopper section 21c of theactuator 21 abuts against thecushion 14, whereby rotational downward movement of thefirst pedal 20 is restricted. - On the other hand, when the depression operation of the
first pedal 20 is released from the depressed state shown inFIG. 5b , thefirst pedal 20 rotational moves upwardly about thegroove section 20a as a fulcrum by the urging force of thefirst spring 50. Then, returning to the initial state shown inFIG. 5a , thefirst pedal 20 abuts against thecushion 13, and its upward rotational movement is restricted. - Next, referring to
FIGs. 6a, 6b, 6c , actions that take place upon depression operation of thethird pedal 40 are described. When thethird pedal 40 is operated by pedal-depression from the initial state shown inFIG. 6a (in the state in which thethird pedal 40 is at the upper limit position), thethird pedal 40 rotationally moves downwardly about thegroove section 40a as a fulcrum supported by the supportingsection 11 of thechassis 10. In this case, as thelever section 61 of thesensor 60 is pushed by thetransmission section 41 b of theactuator 41, the amount of depression of thethird pedal 40 is detected by thesensor 60. As a result, a voltage value corresponding to the amount of depression of thethird pedal 40 is outputted to the electronic keyboard apparatus, whereby a sound effect similar to that of the damper pedal of an acoustic piano is given to musical sounds of the electronic keyboard apparatus. Also, in this case, the first reaction force countering the depression operation is applied by thefirst spring 50 to thethird pedal 40. - Then, in the specified state shown in
FIG. 6b (in the state in which the amount of depression of thethird pedal 40 reaches a specified amount), themoveable stopper 44 of the second reactionforce application mechanism 42 abuts against thecushion 14. Also, the depression operation on thethird pedal 40 is continued after the specified state shown inFIG. 6b , themoveable stopper 44 enters thestopper section 41c of theactuator 41 while compressing thesecond spring 43. In this case, in addition to the first reaction force by thefirst spring 50, the second reaction force countering the depression operation by thesecond spring 43 is also applied to thethird pedal 40, whereby the operation load changes. As a result, a feeling of operation similar to that of the damper pedal of an acoustic piano can be given to the performer. - Then, upon reaching the depressed state shown in
FIG. 6c (in the state in which thethird pedal 40 is at the lower limit position), thestopper section 41c of theactuator 41 abuts against thecushion 14, whereby rotational downward movement of thethird pedal 40 is restricted. - On the other hand, when the depression operation of the
third pedal 40 is released in the depressed state shown inFIG. 6c , thethird pedal 40 rotationally moves upwardly about thegroove section 40a as a fulcrum by the urging force of thefirst spring 50 and thesecond spring 43. Then, returning to the initial state shown inFIG. 6 (a) , thethird pedal 40 abuts against thecushion 13, and its upward rotational movement is restricted. - Next, referring to
FIG. 7 , the relation between the amounts of depression of thefirst pedal 20, thesecond pedal 30 and thethird pedal 40, and their operation loads and voltage values outputted to the electronic keyboard apparatus are described.FIG. 7 is a graph showing the relation between the amounts of depression of thefirst pedal 20, thesecond pedal 30 and thethird pedal 40, and their operation loads and voltage values outputted to the electronic keyboard apparatus. It is noted that a solid line F1, 2 inFIG. 7 indicates the relation between the amounts of depression of thefirst pedal 20 and thesecond pedal 30 and their operation loads, a solid line F3 indicates the relation between the amount of depression of thethird pedal 40 and its operation load, and a broken line V indicates the relation between the amount of depression of each of thepedals - First, the relation between the amounts of depression of the
first pedal 20, thesecond pedal 30 and thethird pedal 40 and their operation loads is described. Only the first reaction force by thefirst spring 50 is applied to thefirst pedal 20 and thesecond pedal 30 from the initial state to the depressed state. Therefore, the operation load of each of thepedals first spring 50 is pre-compressed (pre-pressurized), such that a reaction force according to the compression amount is applied to each of thepedals - In contrast, only the first reaction force by the
first spring 50 is applied to thethird pedal 40 from the initial state to the specified state (in a range indicated as a period A), and the second reaction force by thesecond spring 43 in addition to the first reaction force by thefirst spring 50 are applied to thethird pedal 40 from the specified state to the depressed state (in a range indicated as a period B). Therefore the operation load of thethird pedal 40 changes during the course of depression, as indicated by the solid line F3. More specifically, the operation load of thethird pedal 40 linearly increases with the amount of depression from the initial state to the specified state (in the range indicated as the period A) because only the first reaction force by thefirst spring 50 is applied. - It is noted that the
first spring 50 is pre-compressed (pre-pressurized), such that a reaction force according to the compression amount is applied to thethird pedal 40 at the start of the depression operation. Then, upon reaching the specified state, the second reaction force by thesecond spring 43 in addition to the first reaction force by thefirst spring 50 are applied to thethird pedal 40, such that the operation load of thethird pedal 40 linearly changes according to the amount of depression at a greater change rate than that during the period from the initial state to the specified state. In this case, as thesecond spring 43 is pre-compressed (pre-pressurized), a reaction force according to the compressed amount is applied to thethird pedal 40 when it reaches the specified state. - In this manner, the
pedal device 1 is provided with thethird pedal 40 whose operation load changes in a stepwise fashion according to the amount of depression together with thefirst pedal 20 and thesecond pedal 30 whose operation load is constant regardless of the amount of depression, whereby differences are given to the pedal operation feelings. - Next, the relation between the amounts of depression of the
first pedal 20, thesecond pedal 30 and thethird pedal 40 and voltage values to be outputted to the electronic keyboard apparatus is described. The voltage value to be outputted to the electronic keyboard apparatus linearly increases with the amount of depression, when the amount of depression exceeds a predetermined amount of depression of each of thepedals - As described above, the
pedal device 1 in accordance with the present embodiment is equipped with thefirst spring 50 that applies the first reaction force countering the depression operation to thethird pedal 40, and the second reactionforce application mechanism 42 that applies the second reaction force countering the depression operation to thethird pedal 40 when the amount of depression of thethird pedal 40 exceeds the specified amount, such that the operation load of thethird pedal 40 can be changed in a stepwise fashion according to the amount of depression. Accordingly, a feeling of operation similar to that of the damper pedal of an acoustic piano can be realized. - Also, the
first spring 50 is provided between the supporting position of thethird pedal 40 supported by thechassis 10 and the operation position of thethird pedal 40 that is operated through depression by the performer, and applies the first reaction force to thethird pedal 40 at a position between the supporting position and the operation position. The second reactionforce application mechanism 42 is provided between thefirst spring 50 and the operation position, and applies the second reaction force to thethird pedal 40 at a location between thefirst spring 50 and the operation position of thethird pedal 40. Therefore the position of the second reactionforce application mechanism 42 is set farther from the supporting position of thethird pedal 40 and closer to the operation position, such that the elastic force necessary for the second reactionforce application mechanism 42 can be made smaller. By this, the second reactionforce application mechanism 42 can be made smaller in size and thepedal device 1 can be made smaller in size. - Also, as the second reaction force is applied to the
third pedal 40 at a position between the disposed position of thefirst spring 50 and the operation position, the second reactionforce application mechanism 42 can be made smaller in size, and lowering of the accuracy in the elastic force can be suppressed. By this, the operation load accuracy of thethird pedal 40 can be improved. - Furthermore, according to the
pedal device 1 in accordance with the present embodiment, the second reactionforce application mechanism 42 is disposed opposite to thecushion 14 that is provided between thefirst spring 50 and the operation position of thethird pedal 40. Upon abutting against thecushion 14 when the depression amount of thethird pedal 40 exceeds a specified amount, the second reactionforce application mechanism 42 is compressed in association with the depression operation of thethird pedal 40. This makes the second reactionforce application mechanism 42 more difficult to be influenced by its dimensional accuracy (the dimensional accuracy in the direction of depression operation of the third pedal 40), whereby differences in the amount of depression (the specified amount) of the pedal until the second reaction force is applied to thethird pedal 40, in other words, differences in the backlash can be suppressed. By this, the backlash can be accurately set forindividual pedal devices 1 manufactured. - Next, referring to
FIG. 8 , apedal device 201 of an electronic keyboard apparatus in accordance with a second embodiment is described.FIG. 8 is a cross-sectional view of thepedal device 201 of an electronic keyboard apparatus in accordance with the second embodiment. It is noted that arrows U-D, L-R and F-B inFIG. 8 indicate an up-down direction, a left-right direction and a front-back direction of thepedal device 201 of the electronic keyboard apparatus, respectively. - In the
pedal device 1 of the electronic keyboard apparatus in accordance with the first embodiment, the second reactionforce application mechanism 42 is fitted in thestopper section 41c of theactuator 41. However, in thepedal device 201 of the electronic keyboard apparatus in accordance with the second embodiment (hereafter simply referred to as the "pedal device 201"), a second reaction force application mechanism 242 (or second reaction force application device) is fitted in achassis 210. It is noted that the same components as those of the first embodiment are appended with the same reference numbers, and their description is omitted. - As shown in
FIG. 8 , thepedal device 201 in accordance with the second embodiment has a main body that is formed from achassis 210. Afitting section 216 is provided below anopening section 12 of thechassis 210. Thefitting section 216 is formed in a hollowed out configuration that has an internal space R for fitting a second reactionforce application mechanism 242, and an upper face being open at its central section. The second reactionforce application mechanism 242 is to change the operation load of thethird pedal 40 during the course of depression, and is composed of asecond spring 43 and amoveable stopper 44. The second reactionforce application mechanism 242 is fitted in the internal space R of thefitting section 216, and retained by aplate 217 that is attached to the lower face of thechassis 210. - The
second spring 43 is retained between theplate 217 and themoveable stopper 44 in a pre-compressed (pre-pressurized) state. Themoveable stopper 44 is normally urged by thesecond spring 43, thereby protruding from the upper face of thefitting section 216. When thethird pedal 40 is depression-operated to the extent exceeding a specified amount, themoveable stopper 44 enters the internal space R of thefitting section 216 while compressing thesecond spring 43. - An
actuator 241 is attached to the bottom surface of thethird pedal 40. Theactuator 241 has astopper section 241c whose shape is different from that of theactuator 41 of the first embodiment, and the internal space P is omitted. Also, acushion 14 is attached to the bottom face of thestopper section 241c. Thethird pedal 40 abuts against thefitting section 216 of thechassis 210 through thecushion 14, whereby its downward rotational movement is restricted, and its lower limit position is restricted. By this, the amount of depression of thethird pedal 40 is regulated. - Next, referring to
FIG. 9 , apedal device 301 of an electronic keyboard apparatus in accordance with a third embodiment is described.FIG. 9 is a cross-sectional view of thepedal device 301 of an electronic keyboard apparatus in accordance with the third embodiment. It is noted that arrows U-D, L-R and F-B inFIG. 9 indicate an up-down direction, a left-right direction and a front-back direction of thepedal device 301 of the electronic keyboard apparatus, respectively. - In the
pedal device 1 of the electronic keyboard apparatus in accordance with the first embodiment, the second reactionforce application mechanism 42 is composed of thesecond spring 43 and themoveable stopper 44. However, in thepedal device 301 of the electronic keyboard apparatus in accordance with the third embodiment (hereafter simply referred to as the "pedal device 301"), a second reaction force application mechanism 342 (or second reaction force application device) is composed of a second spring 343 (or a part of the second reaction force application device). It is noted that the same components as those of the first embodiment are appended with the same reference numbers, and their description is omitted. - As shown in
FIG. 9 , thepedal device 301 in accordance with the third embodiment has anactuator 341 that is attached to the bottom surface of thethird pedal 40. Theactuator 341 has astopper section 341c whose shape is different from that of theactuator 41 of the first embodiment. More specifically, thestopper section 341c is formed in a hollowed out configuration that has an internal space P for fitting the second reactionforce application mechanism 342 and is opened at its front and bottom faces. The second reactionforce application mechanism 342 is to change the operation load of thethird pedal 40 during the course of depression, and is composed of thesecond spring 343. This second reactionforce application mechanism 342 is fitted in the internal space P of thestopper section 341 c, thereby being attached to thethird pedal 40 in one piece with theactuator 341. - The
second spring 343 applies a reaction force countering the depression operation to thethird pedal 40, is composed of a leaf spring formed by bending a metal plate material such as a stainless steel plate, and is retained between thethird pedal 40 and thestopper section 341c of theactuator 341 in a pre-compressed (a pre-pressurized) state. Thesecond spring 343 is compressed in association with the depression operation of thethird pedal 40 when thethird pedal 40 is depression-operated to the extent exceeding a specified amount, thereby applying a second reaction force countering the depression operation to thethird pedal 40. - The
second spring 343 is provided with aconvex section 343a. Theconvex section 343a is a portion that abuts against thecushion 14 when thethird pedal 40 is depression-operated to the extent exceeding the specified amount, and is formed in a downwardly protruding convex shape. Theconvex section 343a normally protrudes from the bottom face of thestopper section 341 c, abuts against thecushion 14 when the amount of depression of thethird pedal 40 reaches the specified amount, and enters the internal space P of thestopper section 341c while compressing thesecond spring 343 when thethird pedal 40 is depression-operated to the extent exceeding the specified amount of thethird pedal 40. - Also, the
second spring 343 is provided with a restriction section 343b for restricting the lower limit position of thesecond spring 343. When the restriction section 343b abuts against the inner bottom face of thestopper section 341c, downward movement of thesecond spring 343 is restricted, whereby its lower limit position is controlled. Acushion 345 composed of shock absorbing material, such as, felt, urethane form or the like is attached to the bottom face of the restriction section 343b. The restriction section 343b abuts against the inner bottom face of thestopper section 341c through thecushion 345, whereby the impact of thesecond spring 343 is alleviated. By this, thudding sounds can be suppressed. - As described above, in the
pedal device 301 in accordance with the present embodiment, the second reactionforce application mechanism 342 is composed only of thesecond spring 343, such that the number of components can be reduced, and thepedal device 301 can be made smaller in size. - The invention has been described above based on some embodiments, but the invention is not at all limited to the described embodiments, and it is readily presumed that various kinds of modifications can be made within the range that does not depart from the subject matter of the invention.
- The materials and configurations recited in the embodiments described above are examples, and other materials and configurations can be used. For example, in the embodiments described above, examples in which the
first pedal 20, thesecond pedal 30 and thethird pedal 40 are each formed from a metal material such as brass, iron steel and the like into an elongated plate shape are described. However, without any particular limitation to the above, other kinds of metal material such as stainless steel or the like can be formed into an elongated plate shape, or resin material such as ABS resin, POM resin or the like may be formed into an elongated plate shape. - In the embodiments described above, examples in which the
pedal devices first pedal 20, thesecond pedal 30 and thethird pedal 40 are described. However, without any particular limitation to the above, for example, they may each be formed only from thethird pedal 40, or may be formed from two pedals, for example, thefirst pedal 20 or thesecond pedal 30 and thethird pedal 40, or may be formed from four or more pedals including thethird pedal 40. - The embodiments above are described as to examples in which the
first pedal 20 and thesecond pedal 30 correspond to the soft pedal and the sostenuto pedal of an acoustic piano, respectively, and are structured to give sound effects similar to those of the soft pedal and the sostenuto pedal to musical sounds of an electronic keyboard apparatus. However, without any particular limitation to the above, they can be structured to give other sound effects different from those of the soft pedal and the sostenuto pedal to musical sounds of the electronic keyboard apparatus. - In the embodiments described above, the description is made as to examples in which the
second spring 43 that applies the second reaction force to thethird pedal 40 is formed from a coil-shaped compression spring, and thesecond spring 343 is formed from a leaf spring. However, without any particular limitation to the above, it is possible that other elastic material that is capable of applying the second reaction force to thethird pedal 40 can be used to form thesecond spring
Claims (15)
- A pedal device (201) for an electronic keyboard apparatus to add sound effects to musical notes generated by the electronic keyboard apparatus in response to an operator depressing the pedal device, comprising:at least one pedal (40) that is moved in response to a depression operation;a chassis (210) that rotationally supports the pedal (40) according to the depression operation to move the pedal (40) downwardly about a supporting position supported by the chassis (210);a first reaction force application device that is configured to apply a first reaction force countering a depression of the pedal (40) by the operator from an initial state to a specified state, wherein the first reaction force increases as the pedal (40) is depressed from the initial state to the specified state;a second reaction force application device (242) that is configured to apply a second reaction force countering a depression of the pedal (40) by the operator after the specified state, wherein after the specified state the first reaction force and the second reaction force are applied to the pedal (40);a sensor (60); andan actuator (241) for transferring an amount of the depression of the pedal (40) to the sensor (60) to produce a voltage, wherein the actuator (241) receives the first reaction force from the first reaction force application device at a first location on the actuator (241) and the second reaction force from the second reaction force application device (242) at a second location on the actuator (241);characterised in that the chassis (210) has a first internal space (S) in which the first reaction force application device is mounted and a fitting section (216) formed in a hollowed out configuration having a second internal space (R) in which the second reaction force application device (242) is mounted, wherein the first and second reaction force application devices are mounted between the chassis (210) and the actuator (241), wherein the fitting section (216) abuts against the actuator (241) to restrict a downward movement of the pedal (40) after the specified state.
- A pedal device (1, 301) for an electronic keyboard apparatus to add sound effects to musical notes generated by the electronic keyboard apparatus in response to an operator depressing the pedal device, comprising:at least one pedal (40) that is moved in response to a depression operation;a chassis (10) that rotationally supports the pedal (40) according to the depression operation to move the pedal (40) downwardly about a supporting position supported by the chassis (10);a first reaction force application device that is configured to apply a first reaction force countering a depression of the pedal (40) by the operator from an initial state to a specified state, wherein the first reaction force increases as the pedal (40) is depressed from the initial state to the specified state;a second reaction force application device (42, 342) that is configured to apply a second reaction force countering a depression of the pedal (40) by the operator after the specified state, wherein after the specified state the first reaction force and the second reaction force are applied to the pedal (40);a sensor (60); andan actuator (41,341) for transferring an amount of the depression of the pedal (40) to the sensor (60) to produce a voltage, wherein the actuator (41,341) receives the first reaction force from the first reaction force application device at a first location on the actuator (41,341) and the second reaction force from the second reaction force application device (42,342) at a second location on the actuator (41,341);characterised in that the chassis (10) has a first internal space (S) in which the first reaction force application device is mounted, and the actuator (41,341) has a stopper section (41c,341c) provided on the bottom face of the actuator (41,341) and formed in a hollowed out configuration having a second internal space (P) in which the second reaction force application device (42,342) is mounted, wherein an opening is provided at the bottom face of the stopper section (41 c,341 c), wherein the first and second reaction force application devices are mounted between the chassis (10) and the actuator (41,341) and wherein the stopper section (41c;341c) abuts against the chassis (10) to restrict a downward movement of the pedal (40) after the specified state.
- The pedal device of either claim 1 or 2, wherein
the second reaction force application device (42, 242, 342) is pre-compressed in a state in which the amount of depression of the pedal (40) does not reach a specified amount which corresponds to the specified state, and is compressed in association with the depression operation of the pedal (40) when the amount of depression of the pedal (40) exceeds the specified amount, wherein the second reaction force application device (42, 242, 342) applies the second reaction force with an elastic force countering the depression operation to the pedal (40),
wherein the first reaction force application device is located between the supporting position of the pedal (40) and the operation position, and wherein the first reaction force application device applies the first reaction force to the pedal (40) at a position between the supporting position and the operation position, and
wherein the second reaction force application device (42) is located between a position of the first reaction force application device and the operation position, and wherein the second reaction force application device (42, 242, 342) applies the second reaction force to the pedal (40) at a position between a position of the first reaction force application device and the operation position. - The pedal device of claims 1 and 3, further comprising:a restriction device (14) located at a position between a position of the first reaction force application device and the operation position, wherein the restriction device (14) restricts a lower limit position of the pedal (40) by restricting rotational movement of the pedal (40),wherein the second reaction force application device (242) is disposed on the chassis (210) opposite to the restriction device (14), and abuts against the restriction device (14) when the amount of depression of the pedal (40) exceeds the specified amount, wherein the second reaction force application device (242) is compressed in association with the depression operation of the pedal (40).
- The pedal device of claims 2 and 3, further comprising:a restriction device (14) located at a position between a position of the first reaction force application device and the operation position, wherein the restriction device (14) restricts a lower limit position of the pedal (40) by restricting rotational movement of the pedal (40),wherein the second reaction force application device (42, 342) is disposed on the pedal (40) opposite to the restriction device (14), and abuts against the restriction device (14) when the amount of depression of the pedal (40) exceeds the specified amount, wherein the second reaction force application device (42, 342) is compressed in association with the depression operation of the pedal (40).
- The pedal device of claim 5, wherein
the actuator (41, 341) is removably attached to the pedal (40) and has the stopper section (41c, 341c) disposed opposite to the restriction device (14) in a state of the actuator (41, 341) being attached to the pedal (40), wherein the second reaction force application device (42, 342) is fitted inside the stopper section (41c, 341c), and attached to the pedal (40) in one piece with the actuator (41). - The pedal device of claim 6, wherein
the sensor (60) that detects the amount of depression of the pedal (40) based on the amount of rotational movement of the pedal (40), and is structured to output an electrical signal to the electronic keyboard apparatus according to a detection result of the sensor (60),
wherein the actuator (41, 341) is equipped with a transmission section (41b) that transfers the amount of rotational movement of the pedal (40) to the sensor (60). - The pedal device of claim 2, wherein the second reaction force application device (42, 342) is fitted in the stopper section (41c, 341c) which is hollow, wherein the second reaction force application device (42, 342) is regulated by a lower limit position of the stopper section (41c, 341c) reached when the pedal (40) is depressed to the specified state, and wherein the second reaction force application device applies the second reaction force when the pedal (40) is depressed after the stopper section (41c, 341c) reaches the lower limit position.
- The pedal device of claim 2, further comprising:a restriction device (14); and
a movable stopper (44), wherein the stopper section (41c) is formed between the pedal (40) and the movable stopper (44), wherein when the movable stopper (44) abuts the restriction device (14), a downward rotational movement and lower position of the pedal (40) is restricted, and wherein the movable stopper (44) enters an internal space (P) of the stopper section (41 c) to compress the second reaction force application device (42) to produce the second reaction force when the pedal (40) is depressed by the operator after the specified state. - The pedal device of claim 2, further comprising:a restriction device (14); andwherein the stopper section (41 c, 341c) is formed in the actuator (41, 341), wherein the second reaction force application device (42) is disposed in the stopper section (41c, 341c) and has a protruding section extending through a bottom of the stopper section (41 c, 341 c), and wherein the protruding section abuts the restriction device (14) when the pedal (40) is depressed to the specified state, and wherein the protruding section enters the stopper section (41c, 341 c) when the pedal (40) is depressed following the specified state, and wherein the stopper section (41c, 341c) abuts against the restriction device (14) to restrict the downward movement of the pedal (40) after the specified state.
- The pedal device of any of claims 1 to 10, wherein the first reaction force device comprises a first spring (50) and wherein the second reaction force device (42, 242, 342) comprises a second spring (43, 243, 343), wherein the first and second springs apply the first and second reaction forces to the pedal (40).
- The pedal device of any of claims 1 to 11 further comprising at least one further pedal (20, 30) equipped with a first reaction force application device only.
- The pedal device of claim 12, wherein the at least one pedal (40) provides sound effects to simulate a damper pedal of an acoustic piano and wherein the at least one further pedal (20, 30) provides sound effects to simulate one of a soft pedal and a sostenuto pedal of the acoustic piano.
- The pedal device of claim 12 or 13, wherein the at least one pedal (40) produces a first operation load that changes in a stepwise fashion after being depressed after the specified state, and wherein the at least one further pedal (20, 30) produces a second operation load that linearly increases as depressed from the initial state to the specified state.
- The pedal device of any of claims 1 to 13, wherein an operation load of the at least one pedal (40) linearly increases at a first change rate with an amount of the depression of the pedal (40) from the initial state to the specified state when only the first reaction force is applied, and wherein after the specified state, the operation load of the pedal (40) linearly changes at a second change rate according to the amount of depression of the pedal (40) after the specified state, wherein the second change rate is greater than the first change rate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2010046624A JP5653051B2 (en) | 2010-03-03 | 2010-03-03 | Electronic keyboard instrument pedal device |
US201013978311A | 2010-12-23 | 2010-12-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2372694A2 EP2372694A2 (en) | 2011-10-05 |
EP2372694A3 EP2372694A3 (en) | 2012-01-11 |
EP2372694B1 true EP2372694B1 (en) | 2016-08-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11153681.9A Active EP2372694B1 (en) | 2010-03-03 | 2011-02-08 | Pedal device for electronic keyboard instrument |
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EP (1) | EP2372694B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP7059972B2 (en) * | 2019-03-14 | 2022-04-26 | カシオ計算機株式会社 | Electronic musical instruments, keyboard instruments, methods, programs |
Family Cites Families (8)
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JPS5886694U (en) * | 1981-12-07 | 1983-06-11 | コロムビア音響工業株式会社 | pedal device |
US4744279A (en) * | 1986-05-30 | 1988-05-17 | Livingston Duane P | Adjustable drum pedal device |
JP3059105B2 (en) * | 1996-07-12 | 2000-07-04 | ローランド株式会社 | Electronic percussion pedal device |
JP2004334008A (en) | 2003-05-09 | 2004-11-25 | Yamaha Corp | Pedal device of electronic keyboard instrument |
US7459626B2 (en) * | 2004-11-05 | 2008-12-02 | Roland Corporation | Apparatus and method for detecting displacement of a movable member of an electronic musical instrument |
US7956261B2 (en) * | 2008-03-24 | 2011-06-07 | Yamaha Corporation | Pedal apparatus of electronic musical instrument |
JP5223490B2 (en) * | 2008-06-24 | 2013-06-26 | ヤマハ株式会社 | Force control device for pedal of electronic keyboard instrument |
JP5103327B2 (en) | 2008-08-22 | 2012-12-19 | 高砂熱学工業株式会社 | Waste ozone treatment method and waste ozone treatment system |
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2011
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EP2372694A3 (en) | 2012-01-11 |
EP2372694A2 (en) | 2011-10-05 |
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