JP2550103Y2 - Electronic musical instrument fulcrum device - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial applications] The present invention is mainly used for electronic pianos,
The present invention relates to a fulcrum device applied to a keyboard device of an electronic musical instrument such as an electronic organ.

[0002]

2. Description of the Related Art Conventionally, as a keyboard device of this type, a reed b is provided on a metal keyboard chassis a integrally formed with an electronic musical instrument as shown in FIG. A fulcrum f for swingably supporting a wooden white key d or a black key e by providing a pin c, and a hammer g swinging by these keys is provided behind these keys d and e. There is. The hammer g is provided for imparting an inertial force to the swing of the key, but it is advantageous to set the mounting position above the rear part of the key so that the width of the keyboard device can be reduced. 2 and 3, shafts h, h having an oval cross section are provided on both sides of a swinging hammer g, as shown in FIGS.
A bearing hole k substantially equal to the maximum diameter of the shaft h, a narrow introduction groove 1 for introducing the shaft h from the outside, and a split groove n for allowing the hammer m to enter therein. And a bearing hole k to form a freely fulcrum-shaped fulcrum j, and to introduce a shaft h from the introduction groove l into the bearing hole k so as to swingably support the hammer g on the fixing member i as shown in the figure. Thought. The introduction groove l
Is formed substantially equal to the minimum width of the axis h.

[0003]

In the keyboard device, it is not preferable that the hammer g swings sideways because it impairs the touch feeling of the key. Therefore, in the configuration shown in FIG. The clearance between the hammer g and the side surface p that comes into contact with the hammer g must be small over a wide area of the entire clearance. However, since the hammer g and the fixing member i are manufactured by resin molding or casting, it is necessary to perform the die processing very precisely in order to reduce the clearance size, which increases the cost. In addition, if the contact area is reduced, the mold processing cost is reduced. However, since it is impossible to sufficiently prevent the lateral vibration, a lateral vibration preventing member must be separately provided, which is troublesome.

[0004] Such a problem of preventing lateral shake also occurs when the key is directly supported on the fixing member. An object of the present invention is to prevent a lateral swing of a swing member such as a hammer or a key supported by a fulcrum of such a keyboard device by a simple structure and a structure that can be manufactured at a low cost. is there.

[0005]

According to the present invention, in order to achieve the above object, a fulcrum for swingably supporting a swing member such as a key of an electronic musical instrument on a fixed member is provided by any one of these members. A shaft having an oval cross section provided on both side surfaces of one member, and a bearing hole provided with an introduction groove for introducing the shaft from the outside provided on the other member. A first contact surface protruding from a side surface of the one member is formed around a shaft of the one member, and a first contact surface is formed around the axis of the one member. A second contact surface was formed by reducing the width between the side surfaces, and an anti-lateral shake surface approaching the second contact surface was formed on the inner surface of the split groove of the other member.

[0006]

The rocking member such as a key or a hammer and the fixing member provided on the keyboard chassis and the like come into contact with the first contact surface and the second contact surface, so that these contact surfaces and the contact surfaces are contacted. The swinging member and the fixed member may be molded using a mold whose surface is precisely machined, and the cost of the mold is reduced. In addition, the flexibility of the fulcrum is not impaired, and no special anti-sway member is required, so that the members can be easily assembled and replaced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
In FIG. 4, reference numeral 1 denotes a metal keyboard chassis of a keyboard device of an electronic musical instrument, 2 denotes a wooden key, and the key 2 is vertically moved by a fulcrum constituted by a reed and pins as in the case of FIG. Rocked. Reference numeral 3 denotes a swinging member made of a hammer that is swingably provided above the rear part of the key 2, and the swinging member 3 is a keyboard chassis 1.
The supporting member 5 is swingably supported at a fulcrum 5 on a fixing member 4 fixed to the supporting member 5.
6 is a cushion for regulating the swing of the key 2, and 7 is the swing member 3.
This is a cushion for restricting upward swing of the cushion.

The details of the structure of the fulcrum 5 are as shown in FIGS. 5 and 6. Shafts 8, 8 having an oval cross section are provided on both sides of the side surface 3 a of the swinging member 3, and the fixing member 4 Bearing hole 1 with introduction grooves 9 for introducing shaft 8 from outside
The fulcrum 5 is formed by the shaft 8 and the bearing hole 10 provided with the split grooves 0 and 10 and the groove 11 for the rocking member 3 to enter. The width of the introduction groove 9 is substantially equal to the minimum diameter of the shaft 8, and the diameter of the bearing hole 10 is substantially equal to the maximum diameter of the shaft 8.

Around each shaft 8 of the swing member 3, the side surface 3
a first abutment surfaces 12 protruding from the a, and the width between the side surfaces 3a, 3a is reduced at the rear end of the swinging member 3, and the second abutment surfaces 13, 13 are formed there. did. Further, the inner surfaces of the split grooves 11 of the fixing member 4 have two second contact surfaces 13, 13.
The anti-lateral shake surfaces 14, 14 are formed close to each other. The same number of the swinging members 3 and the fixing members 4 as the number of the keys 2 must be prepared, and a mold is used for the manufacture thereof. The portions corresponding to the surfaces 12 and 13 and the portion corresponding to the surfaces of the fixing member 4 corresponding to the first and second abutting surfaces 12 and 13 may be precisely processed, so that the mold is simple and inexpensive. Becomes The method of attaching the swing member 3 to the fixed member 4 is the same as that shown in FIG.
The rocking member 3 is introduced while being inclined so that the minimum diameter of the rocking member 9 matches the introduction groove 9 of the fixing member 4, and when the shaft 8 reaches the bearing hole 10, the inclination is returned and these are fitted.

FIG. 7 shows an introduction groove 9 and a bearing hole 1 in a swinging member 3.
This is an embodiment in which the shaft 8 is provided on the fixed member 4 by forming the 0 and the split groove 11.
The first and second contact surfaces 12 and 13 are formed on the member 3 and the member 3 having the split groove 11 is formed with the anti-lateral shake surface 14 in the same manner as in the above embodiment. The swinging member 3 is not limited to a hammer, but may be a key or other keyboard instrument member.

[0011]

As described above, according to the present invention, the fulcrum for swingably supporting the swinging member of the electronic musical instrument on the fixed member is provided with a shaft having an oval cross section and a shaft for introducing the shaft from outside. A bearing hole provided with an introduction groove, and at a fitting fulcrum provided with a split groove into which one of these members enters, the other member having a shaft protruding from a side surface at one of the members provided with a shaft. (1) The second contact surface is formed by reducing the width of the contact surface and the member, and the lateral shake prevention surface is formed on the inner surface of the split groove of the other member provided with the split groove. These members can be manufactured inexpensively with less precision machining of the mold, and there is an effect that the advantage of assembling the fulcrum is not impaired.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of a conventional example.

FIG. 2 is a perspective view of a main part of a conventional example.

FIG. 3 is a cutaway side view of FIG. 2;

FIG. 4 is a perspective view of a main part of the embodiment of the present invention.

FIG. 5 is an exploded perspective view of the embodiment of FIG. 4;

FIG. 6 is a sectional view of a main part of the present invention.

FIG. 7 is a perspective view of another embodiment of the present invention.

[Explanation of symbols]

2 key 3 swing member 3a, 3a side surface 4 fixing member 5 fulcrum 8 shaft 9 introduction groove 10 bearing hole 11 split groove 12 first contact surface 13 second contact surface 14
Anti-sway surface

Claims (2)

(57) [Scope of request for utility model registration] A fulcrum for swingably supporting a rocking member such as a key of an electronic musical instrument on a fixed member is provided on a shaft having an oval cross section provided on both sides of one of these members, and the other. And a bearing hole provided with an introduction groove for introducing the shaft from the outside of the member, and a split groove into which the one member enters is provided in the other member. A first raised from a side of the one member around an axis of the one member;
A second contact surface is formed by forming a contact surface and reducing a width between the side surfaces of the one member, and a lateral groove close to the second contact surface is formed on an inner surface of the split groove of the other member. A fulcrum device for an electronic musical instrument, wherein a sway prevention surface is formed. 2. A shaft having an oval cross section is formed on both sides of a rocking member such as a key of an electronic musical instrument, and a fixing member fixed to a keyboard chassis or the like has an introduction groove for introducing the shaft from outside. Forming a bearing hole provided therein and a split groove into which the rocking member enters, forming a first contact surface protruding from a side surface of the rocking member around a shaft of the rocking member, and forming the rocking member. Forming a second contact surface by reducing the width between the side surfaces of the fixing member, and forming an anti-lateral shake surface close to the second contact surface on the inner surface of the split groove of the fixing member. Item 2. A keyboard device for an electronic musical instrument according to item 1.