JP2011070109A - Keyboard device of electronic keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyboard device of an electronic keyboard instrument that miniaturizes an electronic keyboard instrument body and improves the flexibility of layout of other components arranged around a hammer. <P>SOLUTION: The keyboard device includes a key 11 that extends longitudinally and is rockably supported by a fulcrum 4, and the hammer 31 that is arranged behind the fulcrum 4 and above the key 11, and turns upward by pressing up by the key 11 in response to the pressing of the key 11. The key 11 integrally includes a wooden front member 12 arranged on the front side, and a rear member 15 made of metal or synthetic resin arranged on the rear side. The rear member 15 includes a front 16 extending longitudinally connected to the front member 12, a step 17 extending downward from the lower end of the front 16, and a rear 18 extending backward from the lower end of the step 17. The hammer 31 is mounted on the rear 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a keyboard device for an electronic keyboard instrument such as an electronic piano.

  Conventionally, as this type of keyboard device, for example, one disclosed in Patent Document 1 is known. This keyboard device is applied to an electronic piano, and includes a shelf board, a plurality of keys placed on the shelf board, and a hammer provided on each key.

  The key has a front member and a rear member disposed on the rear side thereof, and each extends linearly in the front-rear direction. The front member is screwed to the rear member in a state where the rear end portion is placed on the rear member. A hammer drive member is attached to the rear end portion of the rear member, and the hammer drive member protrudes obliquely upward rearward from the rear member. In addition, the key is swingably supported by a fulcrum on the shelf plate at a portion on the rear side of the connecting portion of the rear member with the front member.

  The hammer is disposed above the rear part of the key, extends rearward and downward in the key release state, and is rotatably supported by the support shaft at the lower end part. In the key release state, the lower part of the hammer is in contact with the hammer driving member of the key, the upper part is in contact with the hammer rail extending in the left-right direction, and the hammer is driven by the hammer as the key is pressed. It is pushed up by the member and pivots upward.

Japanese Utility Model Publication No. 61-41118

  However, in this keyboard device, the rear member of the key extends linearly in the front-rear direction, and a hammer is disposed above it. For this reason, the installation position of a hammer becomes high and the height of an electronic piano main body also becomes high according to it, As a result, an electronic piano main body cannot be reduced in size. Further, since the installation position of the hammer becomes high, there is no room in the space above the hammer, and the degree of freedom in layout of other components arranged in this space is reduced.

  The present invention has been made to solve the above-described problems, and can reduce the size of the electronic keyboard instrument body and improve the degree of freedom in layout of other components arranged around the hammer. An object of the present invention is to provide a keyboard device for an electronic keyboard instrument capable of performing the above.

  In order to achieve the above object, the invention according to claim 1 is directed to a key that extends in the front-rear direction and is swingably supported by a fulcrum, and is disposed behind the fulcrum and above the key. And a hammer that rotates upward by being pushed up by a key, the key being a wooden front member disposed on the front side, and a metal or synthetic resin rear member disposed on the rear side. The rear member extends in the front-rear direction and is connected to the front member, a step portion extending downward from the rear end portion of the front portion, and a rear portion extending rearward from the lower end portion of the step portion. The hammer is placed on the rear part of the rear member.

  According to this configuration, the rear portion of the rear member of the key extends rearward through the step portion extending downward from the rear end portion of the front portion of the rear member. Located at a lower position than the front. For this reason, the installation position of the hammer placed on the rear part of the rear member is lowered, and the height of the electronic keyboard instrument main body is accordingly lowered. As a result, the electronic keyboard instrument main body can be made compact. In addition, the lower the installation position of the hammer, the more space is created above the hammer, and the freedom of layout of other components such as the keyboard lid and operation panel is improved. Can be made.

  Further, since the front side member of the key is made of wood, it is possible to obtain the same good appearance and touch feeling as the acoustic keyboard instrument. On the other hand, since the rear member of the key is made of metal or synthetic resin, high rigidity can be secured.

  The invention according to claim 2 is the keyboard device of the electronic keyboard musical instrument according to claim 1, wherein the rear member is formed in a U-shaped cross section from the left and right side walls and the bottom wall, and is formed on the upper surface of the bottom wall. The hammer is placed, and a cushion against which the hammer that returns and rotates downward as the key is pressed is attached.

  According to this configuration, since the rear member of the key has a U-shaped cross section and is formed in a hollow shape, it is possible to achieve both the securing of the rigidity of the rear member and, consequently, the key and weight reduction. . A hammer is mounted on the upper surface of the bottom wall of the rear member, and a cushion against which the hammer that returns and rotates is attached. With this configuration, the installation position of the hammer can be further lowered, and thereby the electronic keyboard instrument body can be further compacted.

  According to a third aspect of the present invention, in the keyboard device of the electronic keyboard instrument according to the first or second aspect, the front member and the rear member of the key are connected in a state of overlapping each other in the vertical direction, and the keys are connected. It is characterized by being supported by a fulcrum in the part.

  According to this configuration, the key is supported by the fulcrum at the portion where the front member and the rear member overlap. For this reason, since the key is firmly supported by the fulcrum as compared with the case where the key is supported by any one of the front side member and the rear side member, stable operation of the key can be ensured.

It is a sectional side view which shows the keyboard apparatus of the electronic piano to which this invention is applied in a key release state. It is a side view which shows a rear side member. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a sectional side view which shows the keyboard apparatus of FIG. 1 in a key pressing state.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a keyboard device 2 of an electronic piano 1 according to an embodiment in a key release state. As shown in the figure, the keyboard device 2 includes a keyboard chassis 3, a large number of keys 11 (only one is shown), an action chassis 21, and a large number of hammers 31 (only one is shown).

  The keyboard chassis 3 is an assembly of iron plates punched and bent by a press, and is fixed to a horizontal shelf (not shown). A large number of balance pins 4 (only one is shown) are erected in the left-right direction at the center of the keyboard chassis 3 in the front-rear direction (left-right direction in FIG. 1).

  The key 11 includes a number of white keys 11a (only one is shown) and a black key (not shown), and each extends in the front-rear direction. Since the basic configuration of the white key 11a and the black key is the same as each other, the configuration of the white key 11a will be described below as a representative example. The white key 11a integrally includes a front member 12 disposed on the front side and a rear member 15 disposed on the rear side, both of which extend in the front-rear direction. The front member 12 is made of wood having a rectangular cross section, and a synthetic resin key cover 13 is attached to the upper surface thereof. In the rear portion of the front member 12, a balance pin hole 12a penetrating in the vertical direction is formed. Further, the lower portion of the rear end portion including the balance pin hole 12 a portion of the front member 12 is a connecting portion 12 b with the rear member 15. As for this connection part 12b, the left and right side surfaces are chamfered, and thereby the width in the left-right direction is smaller than the other parts of the front member 12.

  The rear member 15 is formed of a molded product of metal or synthetic resin, and as shown in FIG. 2, a front portion 16 extending in the front-rear direction, and a step portion 17 extending downward from the rear end portion of the front portion 16, The rear portion 18 extends rearward from the lower end portion of the stepped portion 17. The rear portion 18 is slightly inclined downwardly with respect to the front portion 16, and the rear end portion thereof is substantially parallel to the front portion 16.

  As shown in FIG. 3, the rear member 15 is formed in a hollow shape with a U-shaped cross section from the left and right side walls 15a, 15a and the bottom wall 15b. Further, on the upper surface of the bottom wall 15b of the rear portion 18 of the rear member 15, a first cushion 19a is provided at a position corresponding to the front end portion of the hammer 31, and a second cushion is provided at a position corresponding to a capstan 34 described later. 19b is attached (see FIG. 2). These first and second cushions 19a, 19b are made of, for example, urethane foam. A balance pin hole 16a corresponding to the balance pin hole 12a of the front member 12 is formed in the center of the bottom wall 15b of the front portion 16 of the rear member 15, and mounting holes 16b and 16b are formed in front and rear thereof. ing.

  The rear member 15 having the above-described configuration is fitted to the front portion 16 by fitting the connecting portion 12b of the front member 12 in the vertical direction from above, and is fixed to the mounting holes 16b and 16b with screws 16c and 16c passed from below. It is connected to the front member 12 (see FIG. 1). As described above, since the left and right side surfaces of the connecting portion 12b of the front member 12 are chamfered, the side walls 15a and 15a of the rear member 15 fitted to the connecting portion 12b and the side surfaces of other portions of the front member 12 are , Being flush with each other. The key 11 is swingably supported by the balance pin 4 through the balance pin holes 12a and 16a of the front member 12 and the rear member 15.

  The action chassis 21 is formed of an extruded product of hollow aluminum, extends in the left-right direction so as to cover all the hammers 31, is connected to the keyboard chassis 3, and is fixed to the shelf board. The action chassis 21 is integrally provided with a hammer support portion 22 that supports the hammer 31 and a switch mounting portion 23.

  An arcuate hammer fulcrum 22 a that opens upward is formed on the upper portion of the hammer support portion 22. A key placement portion 22b that protrudes horizontally forward is provided below the hammer fulcrum 22a. The key placement portion 22b is placed on the keyboard chassis 3. A key stopper 24 is attached to the upper surface of the key placement portion 22b. The key stopper 24 is a single band made of felt or foamed urethane, and extends in the left-right direction so as to cover all the keys 11.

  The switch mounting portion 23 is disposed on the upper side of the hammer support portion 22 and extends obliquely upward. A hammer stopper 25 is attached to the front end portion of the lower surface of the switch mounting portion 23. The hammer stopper 25 is also a single band made of foamed urethane or the like, and extends in the left-right direction so as to cover all the keys 11.

  The hammer 31 is provided for each key 11 and includes a rod-shaped synthetic resin hammer body 32, weights 33 and 33 (only one is shown) attached to the hammer body 32, and a capstan 34. An arcuate shaft hole 32 a that opens downward is formed at the rear end of the hammer body 32. The hammer 31 is rotatably supported by the action chassis 21 with the shaft hole 32a engaged with the hammer fulcrum 22a described above. The weights 33 and 33 are made of iron plates or the like, and are attached to front end portions on the left and right side surfaces of the hammer body 32, respectively. The capstan 34 is for adjusting the relative angle of the hammer 31 with respect to the key 11, and is screwed into a portion of the hammer main body 32 in front of the shaft hole 32 a so as to advance and retract. The hammer 31 is placed on the bottom wall 15b of the rear portion 18 of the rear member 15 of the key 11 via a capstan 34 and a second cushion 19b. A switch pressing portion 32b is provided on the front side of the shaft hole 32a of the hammer body 32 so as to protrude upward.

  A key switch 41 is attached to the switch attachment portion 23 of the action chassis 21. The key switch 41 includes a switch board 42 made of a printed board and a switch body 43 provided for each hammer 31. Further, the key switch 41 is switched by screws 45 and 45 through a spacer 44 in a state where the rear end portion of the switch board 42 is inserted into the engagement recess 23a formed in the base end portion of the switch mounting portion 23. It is attached to the attachment part 23. In the key release state, the switch pressing portion 32b of the hammer 31 faces the switch body 43 from below.

  Next, the operation of the keyboard apparatus having the above configuration will be described with reference to FIGS. In the key release state shown in FIG. 1, the key 11 is in contact with the key stopper 24 in a state where the key 11 is pressed downward through the capstan 34 by the weight of the hammer 31 at the rear end portion. When the key 11 is depressed from this key release state, the key 11 rotates about the balance pin 4 in the counterclockwise direction in FIG. Along with this rotation, the key 11 pushes up the hammer 31 via the capstan 34, whereby the hammer 31 rotates about the hammer fulcrum 22a in the clockwise direction in FIG. Thereafter, the hammer 31 comes into contact with the hammer stopper 25 (the state shown in FIG. 4). Further, during the rotation of the hammer 31, the switch pressing portion 32b presses the switch main body 43 of the key switch 41, whereby the key pressing information of the key 11 is detected and detected by a control device (not shown). The sound of the electronic piano 1 is controlled in accordance with the key depression information that has been made.

  Thereafter, when the key 11 is released, the hammer 31 returns and rotates downward, enters the rear member 15 between the left and right side walls 15a, 15a, and is buffered by coming into contact with the cushion 19a. Thereafter, the hammer 31 returns to the key release state shown in FIG.

  As described above, according to the present embodiment, the rear portion 18 of the rear member 15 of the key 11 extends rearward via the step portion 17 extending downward from the rear end portion of the front portion 16. It is located at a position lower than the front portion 16 by the height of 17. For this reason, the installation position of the hammer 31 placed on the rear portion 18 of the rear member 15 is lowered, and the height of the main body of the electronic piano 1 is accordingly lowered. As a result, the main body of the electronic piano 1 can be made compact. it can. Further, since the installation position of the hammer 31 is lowered, there is a margin in the space above the hammer 31 and other components such as a keyboard lid and an operation panel (none of which are shown) are arranged in this space. ) And the like can be improved.

  In addition, since the front member 12 of the key 11 is made of wood, the same good appearance and touch feeling as an acoustic keyboard instrument can be obtained. On the other hand, since the rear member 15 of the key 11 is made of metal or synthetic resin, high rigidity can be ensured.

  Furthermore, since the rear member 15 of the key 11 has a U-shaped cross section and is formed in a hollow shape, both the rigidity of the rear member 15 and thus the key 11 can be secured and the weight can be reduced. . A hammer 31 is mounted on the bottom wall 15 b of the rear member 15, and a cushion 19 against which the hammer 31 that returns and rotates contacts is attached. With this configuration, the installation position of the hammer 31 can be further lowered, thereby making the electronic piano 1 more compact.

  Further, the key 11 is supported by the balance pin 4 at a portion where the front member 12 and the rear member 15 overlap. For this reason, since the key 11 is firmly supported by the balance pin 4 as compared with the case where it is supported by any one of the front side member 12 and the rear side member 15, the stable operation | movement of the key 11 is ensured. be able to.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, the embodiment is an example in which the present invention is applied to an electronic piano, but the present invention is not limited to this, and can be applied to an electronic organ, a synthesizer, and the like. In addition, the configuration of details can be changed as appropriate within the scope of the present invention.

1 Electronic piano (electronic keyboard instrument)
2 Keyboard device 4 Balance pin (fulcrum)
11 Key 12 Front member 15 Rear member 15a Side wall 15b Bottom wall 16 Front portion 17 Step portion 18 Rear portion 19a First cushion (cushion)
31 Hammer

Claims (3)

A key that extends in the front-rear direction and is pivotally supported by a fulcrum
A hammer that is arranged behind the fulcrum and above the key, and rotates upward by being pushed up by the key as the key is depressed;
The key is a wooden front member disposed on the front side;
It has a metal or synthetic resin rear member arranged on the rear side,
The rear member extends in the front-rear direction and is connected to the front member;
A step portion extending downward from the rear end portion of the front portion;
A rear portion extending rearward from the lower end of the step,
The keyboard device for an electronic keyboard instrument, wherein the hammer is placed on the rear portion of the rear member.   The rear member has a U-shaped cross section from the left and right side walls and the bottom wall, and the hammer is placed on the top surface of the bottom wall, and is returned to the lower side as the key is pressed. The keyboard device for an electronic keyboard instrument according to claim 1, wherein a cushion against which the hammer hits is attached.   The front member and the rear member of the key are connected in a state of overlapping each other in the vertical direction, and the key is supported by the fulcrum at the connected portion. A keyboard device for an electronic keyboard musical instrument according to 1 or 2.

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