CROSS-REFERENCE TO RELATED FOREIGN APPLICATION
[0001] This application is a non-provisional application that claims priority benefits under
Title 35, United States Code, Section 119(a)-(d) from Japanese Patent Application
entitled "PEDAL SYSTEM FOR ELECTRONIC KEYBOARD INSTRUMENTS" by Yoshihiko ARAYAMA,
having Japanese Patent Application Serial No.
2010-046624, filed on March 3, 2010, which Japanese Patent Application is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0002] The present invention relates to a pedal device for an electronic keyboard instrument.
2. Description of the Related Art
[0003] 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, 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. According to the pedal device, 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.
[0004] However, while the pedal device described in Japanese Patent Application, Publication
No.
JP2004-334008 described above can realize a feeling of operation similar to that given by the damper
pedal of an acoustic piano, it entails problems, such as, a larger number of components
and a more complex structure as it is equipped with two pedal levers, i.e., the first
pedal lever and the second pedal lever, which lead to an increased size of the device.
SUMMARY
[0005] 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.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 illustrates an exploded perspective view of a pedal device of an electronic
keyboard apparatus in accordance with an embodiment of the invention.
[0007] FIG. 2 illustrates a cross-sectional view of the pedal device of an electronic keyboard
apparatus taken along a line II―II of FIG. 1.
[0008] FIG. 3 illustrates a cross-sectional view of the pedal device of an electronic keyboard
apparatus taken along a line III―III of FIG. 1.
[0009] FIG. 4a illustrates a bottom side perspective view of a first pedal.
[0010] FIG. 4b illustrates a bottom side perspective view of a third pedal.
[0011] FIGs. 5a and 5b show 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.
[0012] FIGs. 6a, 6b, 6c illustrate cross-sectional views of the pedal device of an electronic
keyboard apparatus taken along a line III―III of FIG. 1, wherein FIG. 6a illustrates
an initial state of the third pedal, FIG. 6b illustrates a specified state of the
third pedal, and FIG. 6c illustrates a depressed state of the third pedal.
[0013] 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.
[0014] FIG. 8 illustrates a cross-sectional view of a pedal device of an electronic keyboard
apparatus in accordance with a second embodiment.
[0015] FIG. 9 illustrates a cross-sectional view of a pedal device of an electronic keyboard
apparatus in accordance with a third embodiment.
DETAILED DESCRIPTION
[0016] 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.
[0017] 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.
[0018] 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.
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] The embodiments of the invention are described with reference to the accompanying
drawings. 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.
[0032] First, referring to FIG. 1, a general structure of the pedal device 1 of the electronic
keyboard apparatus (hereafter simply referred to as the "pedal device 1") is described.
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. As shown in FIG.
1, 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. As the performer depresses and operates
each of the pedals 20, 30 and 40, 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.
[0033] 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.
[0034] 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. Also, 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.
[0035] 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.
[0036] 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. As a result, 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.
[0037] Next, referring to FIG. 1 through FIG. 4, the detailed structure of each of the components
of the pedal device 1 is described. FIG. 2 is a cross-sectional view of the pedal
device 1 taken along a line II―II of FIG. 1, and 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, and FIG. 4 (b) is a bottom side perspective
view of the third pedal 40. It is noted that 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.
[0038] As shown in FIG. 1 through FIG. 3, 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 11 b, such that the
pedals are rotatably supported on the chassis 10 in a cantilever fashion.
[0039] 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. Also, 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. 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.
[0040] 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. Also, 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.
[0041] Here, referring to FIGS. 2 and 4, 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.
[0042] As shown in FIG. 2 and FIG. 4a, a retaining section 21a, a transmission section 21b
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.
[0043] 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. As a result, a voltage value corresponding to the amount
of depression of the first pedal 20 is outputted to the electronic keyboard apparatus.
[0044] 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. When 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.
[0045] As shown in FIG. 3 and FIG. 4b, a retaining section 4 1 a, 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. It is noted that 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.
[0046] 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
41b 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. As a result, 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. Therefore, by suitably changing 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. By this, 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. By this, only by changing the tilt angle 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 readily set.
[0047] 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. When 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.
[0048] 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 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.
[0049] 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. When 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.
[0050] 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 41c. When the amount of depression of
the third pedal 40 reaches the specified amount, 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. Also, when
the third pedal 40 is operated and depressed to the extent exceeding the specified
amount, the second spring 43 is stored in the moveable stopper 44. In this manner,
by forming the moveable stopper 44 in a hollowed out configuration and using the internal
space thereof as a space for storing the second spring 43, the second reaction force
application mechanism 42 can be made smaller in size, and the pedal device 1 can be
made smaller in size.
[0051] 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. When the flange section 44a abuts against the inner bottom
face of the stopper section 41c, downward movement of the moveable stopper 44 is restricted,
whereby its lower limit position is restricted. Also, 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. As the flange section 44a abuts against the inner
bottom face of the stopper section 41c through the cushion 45, impacts thereof can
be alleviated. By this, thudding sounds can be suppressed.
[0052] A guide section 41c1 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.
[0053] Also, a cover section 41 c2 is provided at the front end section of the stopper section
41 c. The cover section 41 c2 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.
[0054] In this manner, 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. Furthermore, even if the pedal (the first pedal 20 or the second
pedal 30) is not equipped with the second reaction force application mechanism 42,
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.
[0055] Next, referring to FIGs. 5a, 5b, 6a, 6b, and 6c, actions of the first pedal 20, the
second pedal 30 and the third 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 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. Also, 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. 6b shown a specified state
of the third pedal, and 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.
[0056] First, referring to FIGs. 5a and 5b, actions that take place as the first pedal 20
is depression-operated are described. It is noted that, because the actions that take
place upon depression operation of the second pedal 30 are similar to the actions
that take place upon depression operation of the first pedal 20, description of the
actions that take place upon depression operation of the second pedal 30 is omitted.
[0057] 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. In this case, 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. As
a result, 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. Also, in this case, the first reaction force countering the depression
operation is applied by the first spring 50 to the first 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.
[0058] Then, upon reaching the depressed state shown in FIG. 5b (in the state in which the
first pedal 20 is at the lower limit position), the stopper section 21c of the actuator
21 abuts against the cushion 14, whereby rotational downward movement of the first
pedal 20 is restricted.
[0059] On the other hand, when the depression operation of the first pedal 20 is released
from the depressed state shown in FIG. 5b, the first pedal 20 rotational moves upwardly
about the groove section 20a as a fulcrum by the urging force of the first spring
50. Then, returning to the initial state shown in FIG. 5a, the first pedal 20 abuts
against the cushion 13, and its upward rotational movement is restricted.
[0060] Next, referring to FIGs. 6a, 6b, 6c, actions that take place upon depression operation
of the third pedal 40 are described. When the third pedal 40 is operated by pedal-depression
from the initial state shown in FIG. 6a (in the state in which the third pedal 40
is at the upper limit position), the third pedal 40 rotationally moves downwardly
about the groove section 40a as a fulcrum supported by the supporting section 11 of
the chassis 10. In this case, as the lever section 61 of the sensor 60 is pushed by
the transmission section 41 b of the actuator 41, the amount of depression of the
third pedal 40 is detected by the sensor 60. As a result, 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.
[0061] Then, in the specified state shown in FIG. 6b (in the state in which the amount of
depression of the third pedal 40 reaches a specified amount), the moveable stopper
44 of the second reaction force application mechanism 42 abuts against the cushion
14. Also, the depression operation on the third pedal 40 is continued after the specified
state shown in FIG. 6b, the moveable stopper 44 enters the stopper section 41c of
the actuator 41 while compressing the second spring 43. In this case, in addition
to the first reaction force by the first spring 50, the second reaction force countering
the depression operation by the second spring 43 is also applied to the third 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.
[0062] Then, upon reaching the depressed state shown in FIG. 6c (in the state in which the
third pedal 40 is at the lower limit position), the stopper section 41 c of the actuator
41 abuts against the cushion 14, whereby rotational downward movement of the third
pedal 40 is restricted.
[0063] On the other hand, when the depression operation of the third pedal 40 is released
in the depressed state shown in FIG. 6c, the third pedal 40 rotationally moves upwardly
about the groove section 40a as a fulcrum by the urging force of the first spring
50 and the second spring 43. Then, returning to the initial state shown in FIG. 6
(a), the third pedal 40 abuts against the cushion 13, and its upward rotational movement
is restricted.
[0064] Next, referring to FIG. 7, 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 are described. 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. It is noted that 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, and 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.
[0065] First, 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.
[0066] In contrast, only the first reaction force by the first spring 50 is applied to the
third pedal 40 from the initial state to the specified state (in a range indicated
as a period A), and 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 from the specified state to the depressed state (in a range indicated as a period
B). Therefore 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.
[0067] 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 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.
[0068] In this manner, 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.
[0069] Next, the relation between the amounts of depression of the first pedal 20, the second
pedal 30 and the third 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 the pedals 20,
30 and 40, as indicated by the broken line V.
[0070] As described above, 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.
[0071] Also, 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.
[0072] Also, as the second reaction force is applied to the third pedal 40 at a position
between the disposed position of the first spring 50 and the operation position, 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.
[0073] Furthermore, according to the pedal device 1 in accordance with the present embodiment,
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. This makes the second reaction force 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 the third pedal 40, in other words, differences in the backlash can
be suppressed. By this, the backlash can be accurately set for individual pedal devices
1 manufactured.
[0074] Next, referring to FIG. 8, a pedal device 201 of an electronic keyboard apparatus
in accordance with a second embodiment is described. 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.
[0075] In the pedal device 1 of the electronic keyboard apparatus in accordance with the
first embodiment, the second reaction force application mechanism 42 is fitted in
the stopper section 41c of the actuator 41. However, in the pedal 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 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.
[0076] As shown in FIG. 8, 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.
[0077] 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. When 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.
[0078] 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. Also, 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.
[0079] Next, referring to FIG. 9, a pedal device 301 of an electronic keyboard apparatus
in accordance with a third embodiment is described. 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.
[0080] In the pedal device 1 of the electronic keyboard apparatus in accordance with the
first embodiment, the second reaction force application mechanism 42 is composed of
the second spring 43 and the moveable stopper 44. However, in the pedal 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.
[0081] As shown in FIG. 9, 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 341c, thereby being attached
to the third pedal 40 in one piece with the actuator 341.
[0082] 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.
[0083] 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 341c, 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.
[0084] Also, the second spring 343 is provided with a restriction section 343b for restricting
the lower limit position of the second spring 343. When the restriction section 343b
abuts against the inner bottom face of the stopper section 341c, downward movement
of the second spring 343 is restricted, whereby its lower limit position is controlled.
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.
[0085] As described above, in the pedal device 301 in accordance with the present embodiment,
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.
[0086] 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.
[0087] 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, 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 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.
[0088] In the embodiments described above, examples in which 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. However, without any particular limitation
to the above, for example, 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.
[0089] The embodiments above are described as to examples in which the 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. 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.
[0090] 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 the third pedal 40
is formed from a coil-shaped compression spring, and the second 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 the third pedal 40 can be used to form the second spring 43 and 343. As the
other elastic material, for example, an elastic member composed of rubber elastic
material, resin material or the like may be exemplified.
1. A pedal device (1, 201, 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 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; and
a second reaction force application device (42, 242, 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).
2. The pedal device of claim 1 further comprising:
a chassis (10, 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 (10, 210);
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.
3. The pedal device of claim 2, 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, 242, 342) is disposed 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) is compressed in association with the
depression operation of the pedal (40).
4. The pedal device of claim 3, further comprising:
an actuator (41, 241, 341) that is removably attached to the pedal (40) and has a
stopper section (41c, 341 c) 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 (41
c, 341 c), and attached to the pedal (40) in one piece with the actuator (41).
5. The pedal device of claim 4, further comprising:
a 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, 241, 341) is equipped with a transmission section (41b)
that transfers the amount of rotational movement of the pedal (40) to the sensor (60).
6. The pedal device of claim 1 or 2, further comprising:
a sensor (60); and
an actuator (41, 241, 341) for transferring an amount of the depression of the pedal
(40) to the sensor (60) to produce a voltage, wherein the actuator (41, 241, 341)
receives the first reaction force from the first reaction force application device
at a first location on the actuator (41, 241, 341) and the second reaction force from
the second reaction force application device (42) at a second location on the actuator
(41, 241, 341).
7. The pedal device of any of claims 1, 2 or 6, wherein the second reaction force application
device (42, 342) is fitted in a hollow stopper section (41c, 341c), wherein the second
reaction force application device (42, 342) is regulated by a lower limit position
of the stopper section (41 c, 341 c) 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.
8. The pedal device of claim 1, 2 or 6, 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 (41c) 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.
9. The pedal device of claim 6, wherein
the chassis (210) has a first internal space (S) in which the first reaction force
application device is mounted and a fitting section (216) 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), and wherein the fitting section (216) abuts
against the actuator (241) to restricts a downward movement of the pedal (40) after
the specified state.
10. The pedal device of claim 6, further comprising:
a restriction device (14); and
a stopper section (41c, 341c) 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 (41 c, 341c) when the pedal (40) is depressed following
the specified state, and wherein the stopper section (41 c, 341c) abuts against the
restriction device (14) to restrict the downward movement of the pedal (40) after
the specified state.
11. 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).
12. The pedal device of any of claims 1 to 11 further comprising at least one further
pedal (20, 30) equipped with the first reaction force application device only.
13. 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.
14. 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.
15. 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.