JPH0637892U - Electronic musical instrument keyboard device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a keyboard device for an electronic musical instrument that can reduce the manufacturing cost by reducing the number of parts when the hammer guide is provided. [Structure] A bearing member 6 fixed to a keyboard chassis 4 to rotatably support the key 1 and a position on the front side of the bearing member 6,
The keyboard chassis 4 is rotatably attached to the keyboard chassis 4, extends rearward, and includes a key 1 and a hammer 2 that rotates in conjunction with the key 1.
The bearing member 6 is formed with a hammer guide 44 that guides the rotational movement of the hammer 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a keyboard device for an electronic musical instrument such as an electronic piano or an electronic organ, and more particularly to a keyboard device equipped with a hammer.

[0002]

[Prior art]

 Generally, in a keyboard device of an electronic musical instrument, a key is rotatably supported by a bearing member fixed to a keyboard chassis, and the pressed state of the key is detected by a key switch arranged under each key. However, sound is generated according to the detection result. In addition, a conventional keyboard device for electronic musical instruments is of a type in which each key is provided with a hammer that rotates in conjunction with the key in order to give the key the same key touch feeling as an acoustic piano. is there. In such a keyboard device with a hammer, especially when the hammer is long, a hammer guide for guiding the hammer is separately attached to the keyboard chassis, which causes malfunction or noise caused by lateral swing of the rotating hammer. To prevent this.

[0003]

[Problems to be solved by the device]

 However, in such a conventional keyboard device, since the hammer guide is provided as a separate component, it is necessary to secure an installation space for the hammer guide on the keyboard chassis, and the number of components is reduced accordingly. Since the number of manufacturing processes increases and the number of assembling steps increases accordingly, there is a problem that manufacturing cost increases.

The present invention has been made to solve such a problem, and reduces the manufacturing cost by reducing the number of parts when the hammer guide is provided, and the keyboard device of the electronic musical instrument. Is intended to provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a keyboard device of an electronic musical instrument of the present invention is fixed to a keyboard chassis, and a bearing member that rotatably supports a key and a pivot member that pivots to a keyboard chassis at a position in front of the bearing member. It is characterized in that it is provided with a hammer that is freely attached, extends rearward, and rotates in conjunction with a key, and that a bearing member is formed with a hammer guide that guides the rotational movement of the hammer. .

[0006]

[Action]

 According to this keyboard device for an electronic musical instrument, the bearing member of the key serves as both a pivotally supporting member for the key and a hammer guide for guiding the hammer. In this case, since the bearing member is arranged rearward of the fulcrum of the hammer, the hammer guide can be arranged at a position far from the fulcrum of the hammer only by extending a part of the bearing member toward the hammer.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 respectively show a hammer-equipped keyboard device to which the present invention is applied, in a state where no key is pressed and a state where a key is pressed. As shown in these figures, this keyboard device includes a key 1, a hammer 2 for giving the key 1 a key touch feeling similar to that of an acoustic piano, and a key switch for detecting a key pressing state. 3 and a keyboard chassis 4 to which these are attached.

The key 1 has a shaft hole 5 formed at a rear end portion (right end portion in the drawing) fitted to a shaft portion 7 of a bearing member 6 for the key 1 arranged on an upper side of a keyboard chassis 4. Is rotatably supported by the bearing member 6. As shown in FIG. 3A, the bearing member 6 includes a substrate 8, a support portion 9 protruding upward from the center of the substrate 8, the shaft portion 7 protruding from the support portion 9 on both sides, and a substrate 8. A pair of hammer guide portions 44a, 44a forming a hammer guide 44 and extending downward from the vicinity of both ends of the rear portion are integrally formed with each other.

On the bearing member 6, one front portion of the base plate 8 and the upper end portion of each hammer guide portion 44a are provided with forwardly projecting claws 10 and 51 at the lower end portion of each hammer guide portion 44a. Engaging projections 52 are formed respectively. The lower ends of the hammer guide portions 44a are connected to each other and reinforced. On the other hand, in the keyboard chassis 4, a hole 12 is formed in the top wall and a mounting opening 53 is formed from the rear end of the top wall to the back wall. In the bearing member 6, the claw 10 is inserted into the hole 12, the claw 51 is inserted into the mounting opening 53, and the hammer guide portion 44a is fitted into the mounting opening 53. Then, the bearing member 6 is slid forward. Then, the pawls 10 and 51 are attached to the keyboard chassis 4 by engaging the claws 10 and 51 with the top wall of the keyboard chassis 4 and the engaging protrusions 52 with the back wall of the keyboard chassis 4, respectively (FIG. 3B). Refer to). In this state, the pair of hammer guide portions 44a, 44a extend downwardly in parallel with each other so as to be within the arm portion 36 of the hammer 2 passed between them.

A mounting plate 11 extending obliquely rearward is fixed to the rear surface of the vertical portion of the keyboard chassis 4 with screws 54, and the lower surface of the mounting plate 11 serves to regulate the upper limit position of the hammer 2. A hammer stopper 15 is attached. The mounting plate 11 contacts the hammer guide portion 44a and also serves as a retaining member for the bearing member 6. On the other hand, the lower limit position of the hammer 2 is restricted by a stopper 16 provided at the bottom of the keyboard chassis 4. In addition, a hook-shaped stopper portion 17 is formed below the front end portion (left end portion in the figure) of the key 1, and the lower and upper limit positions of the key 1 are provided on the upper and lower surfaces of the front end portion of the keyboard chassis 4. A lower limit stopper 18 and an upper limit stopper 19 that regulate the respective limits are provided.

A switch actuator portion 20 and a hammer pressing portion 21 both project downward from the key 1 at a position about 1/3 of the length from the rear end of the key 1 and are integrated with each other with the former as the front side. It is provided in. The switch actuator section 20 is provided with a plurality of protrusions 20a protruding in the left-right direction. The switch actuator section 20 is for directly pressing the key switch 3 to operate it when the keyboard device is of the hammerless type, and does not function particularly when it is of the hammered type. The hammer push-down portion 21 is a pin-like member that protrudes further downward than the lower end surface of the switch actuator portion 20, and the tip end thereof contacts the upper surface of the contact portion 22 of the hammer 2.

The hammer 2 is arranged below the keyboard chassis 4, and its shaft portion 23 is fitted into a shaft hole 25 of a bearing member 24 for the hammer 2 fixed to the keyboard chassis 4. The bearing member 24 is rotatably supported. As shown in FIG. 4 (a), the bearing member 24 has a pair of support plates 26, 26 extending upward in parallel from both ends of the connecting portion. 25, two hook-shaped claws 27, 27 are formed at the upper end, respectively.

In the bearing member 24, each claw 27 is inserted into each of the corresponding four holes 28 of the keyboard chassis 4 from the lower side, and is slid forward to be hooked on the keyboard chassis 4, and then the fixing plate 29. On the keyboard chassis 4, press the four pressing portions 30 horizontally against the claws 27 of the bearing member 24, and fix the fixing plate 29 to the keyboard chassis 4 with the screws 31 with the holes 28 closed. It is firmly fixed to the keyboard chassis 4 (see Fig. 4 (b)).

A spring hook 32 is provided upright on the rear end of the fixed plate 29, while a spring receiver 33 is formed on the rear end of the abutting portion 22 of the hammer 2 so as to project upward. Is made. A return spring 34 is hung between the spring hook 32 and the spring receiving portion 33 to urge the hammer 2 clockwise in the drawing. That is, the fixing plate 29 has both the role of fixing the bearing member 24 to the keyboard chassis 4 and the role of the return spring 34 as a spring hook.

The aforesaid abutting portion 22 of the hammer 2 is arranged on the front side of the shaft portion 23, and can be projected and retracted on the keyboard chassis 4 through a hole 35 formed in the keyboard chassis 4. The hammer 2 has an arm portion 36 that curves backward from the shaft portion 23 and extends long, and a hammer weight 37 is integrally provided at the tip of the arm portion 36. Further, the hammer 2 is formed with a switch actuator portion 38 so as to project forward from a lower portion of the front end of the abutting portion 22, and the key switch 3 is provided below the switch actuator portion 38 with the key 1 Are arranged so as to face each other at a predetermined interval in the non-pressed state.

The key switch 3 is a rubber switch configured to be turned on at two different pressed positions of the key 1, and is a switch circuit printed circuit board 41 fixed to the keyboard chassis 4 by the spacer 39 and the screw 40. It is attached to the top surface. The ON / OFF signal of the key switch 3 is output to a sounding device (not shown). The peripheral portion of the switch circuit print substrate 41 is supported by the bearing member 24. Reference numerals 42 and 43 in the figure are guides for preventing lateral shake of the key 1.

With the above configuration, the keyboard device is kept in the state shown in FIG. 1 when the key 1 is not pressed. That is, the hammer 2 is rotated about the shaft portion 23 in the time direction in the figure by the urging force of the return spring 34 and the weights of the arm portion 36 and the hammer weight 37, and the stopper 16 or the hammer pushing portion. It is in a position regulated by 21. As the hammer 2 rotates, the key 1 is pushed up by the abutting portion 22 of the hammer 2 and rotates clockwise around the shaft hole 5, and the stopper portion 17 abuts on the upper limit stopper 19 to rotate the key 1. The position is restricted. Further, in this state, a certain distance is maintained between the key switch 3 and the switch actuator portion 38 of the hammer 2, and the key switch 3 is in the OFF state.

When the key 1 is pushed from this state, as shown in FIG. 2, the key 1 rotates counterclockwise, and the hammer pressing portion 21 pushes the abutting portion 22 of the hammer 2 to return the return spring. The hammer 2 is pushed down against the biasing force of the armature 34 and the weight of the arm portion 36 and the hammer weight 37, and is rotated counterclockwise. During rotation of the hammer 2, the switch actuator unit 38 pushes the key switch 3 to turn it on. The rotation of the key 1 is restricted by the bottom surface of the key 1 coming into contact with the lower limit stopper 18, and the rotation of the hammer 2 being brought into contact with the hammer stopper 15 respectively.

During this rotation, the arm portion 36 of the hammer 2 is guided by the hammer guide 44. In this case, since the hammer guide 44 is formed on the bearing member 6 of the key 1 and the distance between the hammer guide 44 and the bearing portion 25 of the bearing member 24, which is the fulcrum of the hammer 2, is considerably long. It is possible to extremely effectively guide the hammer 2, that is, to prevent lateral shake, and therefore, it is possible to reliably prevent malfunction and noise due to lateral shake.

As described above, in this embodiment, the hammer guide 44 is formed by extending the bearing member 6 of the key 1 downward. As a result, the bearing member 6 can be made to have both the role of supporting the key 1 and the role of the hammer guide 44 by one member. Therefore, the bearing member and the hammer guide are provided separately from the conventional one. Compared to this, the number of parts can be reduced. Further, since the bearing member 6 of the key 1 is normally arranged at a position that is considerably distant from the bearing member 24 of the hammer 2 in the front-rear direction, by providing the hammer guide 44 on the bearing member 6 of the key 1, A long distance can be secured between the guide 44 and the fulcrum of the hammer 2, so that the hammer guide 44 can effectively guide the hammer 2, that is, prevent lateral shake.

FIG. 5 shows the structure of the bearing member 6 of the key 1 according to the second embodiment of the present invention. As is clear from the figure, this bearing member 6 is different from that of the above-described first embodiment in that a single hammer guide 44 extends downward from the center of the lower surface of the base portion 8 and a through hole formed in the hammer 2. It is different in that it is passed through 61. The bearing member 6 is attached to the keyboard chassis 4 in a state where the engagement recess 62 formed at the lower end of the hammer guide 44 and the engagement recess 63 formed at the lower end of the opening 53 of the keyboard chassis 4 are engaged with each other. It is attached. The other structure is similar to that of the first embodiment described above. Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

The embodiments described so far are preferred examples, and the present invention is not limited to these embodiments, and can be implemented with appropriate modifications without departing from the spirit of the invention. Needless to say.

[0024]

[Effect of device]

 As described above in detail, in the keyboard device of the electronic musical instrument of the present invention, the bearing member of the key can also serve as a hammer guide, and therefore the bearing member and the hammer guide are separately provided. Compared with the conventional keyboard device, the number of parts and the number of assembling steps are reduced, so that the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a keyboard device of a type with a hammer to which the present invention is applied, in a state where no key is pressed.

FIG. 2 is a sectional view showing the keyboard device of FIG. 1 in a depressed state.

FIG. 3 is a perspective view for explaining a structure of a key bearing member and a fixing method thereof.

FIG. 4 is a perspective view for explaining a structure of a bearing member of a hammer and a fixing method thereof.

FIG. 5 is a perspective view similar to FIG. 3, showing a second embodiment of the present invention.

[Explanation of symbols]

 1 key 2 hammer 4 keyboard chassis 6 bearing member 44 hammer guide

Claims (1)

[Scope of utility model registration request] 1. A bearing member fixed to a keyboard chassis for rotatably supporting a key, and a position on the front side of the bearing member.
A hammer that is rotatably attached to the keyboard chassis, extends rearward, and rotates in conjunction with the key;
A keyboard device for an electronic musical instrument, characterized in that a hammer guide for guiding the rotational movement of the hammer is formed in the bearing member.