JPH0157353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a keyboard device for an electronic musical instrument that improves assembly workability.

Conventionally, a keyboard device in an electronic keyboard instrument such as an electronic organ has a plurality of keys integrally formed of synthetic resin or the like, and a top surface of which the plurality of keys are made by press processing and swing vertically. The keyboard frame includes a movably disposed keyboard frame, and a return spring that is interposed between each key and the keyboard frame to impart a return behavior to the keys.

[Prior art]

By the way, various proposals and implementations have been made for the fulcrum structure of the key, and one known example is one using the shaft shown in FIG. 1. That is,
1 is the keyboard frame, 2 is the key, 3 is the keyboard frame 1
This bracket is disposed above and supports a horizontal shaft 4, and the shaft 4 is configured to pivotally support the rear end of the key 2. The key 2 is provided with a bearing hole 5 through which the shaft 4 passes, and the sliding contact between the hole 5 and the shaft 4 ensures stable and smooth rotation of the key 2 and provides a good touch feeling. That's what I do.

However, such conventional fulcrum structures have a major drawback in that assembly and disassembly operations are extremely troublesome. That is, since a plurality of keys 2 are generally arranged in parallel in extremely close proximity, an all-key uniaxial system is usually adopted. Therefore, even if one wants to remove a certain key 2, the key 2 cannot be removed unless the shaft 4 is removed from all the keys and the bracket 3, and all the keys fall apart. Moreover, when assembling, it is extremely difficult to assemble unless all the keys are lined up in reverse order as the shaft 4 will not pass through. In addition, since all the keys are on one axis, it is difficult to provide the shaft 4 with a locking function for the movement of the key 2 in the left and right direction.

[Summary of the invention]

This invention was made in view of the above-mentioned circumstances, and includes a key having a bearing hole formed through the key width direction in the rear part, and a cylindrical or cylindrical shape with an axial length approximately the width of the key and both end faces. A support shaft holder having a support shaft which is provided with an engagement portion on each side, a support shaft which is relatively rotatably inserted into the bearing hole of the key, and a locking portion with which the engagement portion of the support shaft is engaged from the front. parts and
By providing a return habit to the key and at the same time urging the key backward, the engaging part is configured with a return spring that presses against the locking part, thereby realizing a one-key, one-shaft system, and assembling the key. Another object of the present invention is to provide a keyboard device for an electronic musical instrument that improves workability during removal.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is a sectional view showing an embodiment of the keyboard device according to the present invention, and FIG. 3 is an exploded perspective view of the main parts. In these figures, reference numeral 10 denotes a key integrally formed of synthetic resin, and the key 10 is formed with a hollowed out back side, so that the cross-sectional shape is approximately U-shaped. Bearing holes 11 are provided that are open on both sides.

A support shaft 12 whose both ends are held by support shaft holding members 13 is inserted into the bearing hole 11, and the key 10 is supported so as to be rotatable in the vertical direction about the support shaft 12. The support shaft 12 is the key 1
The engaging portions 14A and 14B, each having a length substantially the same as the rear end width of 0, are integrally provided on both end surfaces thereof and are formed of protruding stripes extending in the axial direction. Therefore, the support shaft 12 is inserted into the bearing hole 1.
When inserted into key 1, each engaging portion 14A, 14B
0, respectively.

The support shaft holding member 13 supports the support shaft 1 of each key 10.
A plurality of supporting walls 15A, 1 are arranged in parallel at a predetermined interval by being formed of synthetic resin or the like into a substantially comb-like shape.
5B, 15C... and these supporting walls 15A, 15
A connecting portion 16 that commonly connects the rear ends of B, 15C...
It is disposed on the upper surface of the rear end of the keyboard frame 1.

In this case, the support shaft holding member 13 is shown as being fixed on the keyboard frame 1 with a set screw, but it is not limited to this, and it may be attached removably with an appropriate engagement piece or by an outsert molding method. Therefore, it may be formed integrally with the keyboard frame. Each supporting wall 15A, 15B,
A locking portion 17 consisting of an engaging groove is formed at the center in the height direction of both side surfaces of the support shaft 12, corresponding to the engaging portions 14A, 14B of the support shaft 12. These locking portions 17 are attached to each support wall 15A, 15.
The engagement portions 14A, 14B are inserted into the engagement portions 14A, 14B extending rearward from the front end surfaces of the engagement portions 14A, 15C. Note that two adjacent support walls 15A and 15
The interval between B, 15B and 15C is set corresponding to the rear end width of each key 10 (white key and black key).

A substantially hook-shaped stopper 20 is integrally hung on the lower surface of the front end of the key 10 and extends downward from the lower surface 21 of the front end of the keyboard frame 1. A lower limit stopper 22 and an upper limit stopper 23 are fixed to the upper and lower surfaces of the front end of the keyboard frame 1 to set the rotation range of the key 10 in the vertical direction. In this case, FIG. 2 shows a state in which the lower surface of the front end of the key 10 comes into contact with the lower limit stopper 22 due to the key depression operation, and when the key 10 returns to rotation due to the force of the return spring 25, which will be described later, the stopper 20 comes into contact with the key 10. The contact surface 20a is configured to abut the upper limit stopper 23 from below and lock the key 10 at the initial position. Further, when the key 10 is pressed against the return spring 25, the actuator 26 provided integrally with the key 10 operates the key switch 27 fixed to the back surface of the keyboard frame 1, and the key 10 is pressed. It is configured to electrically generate musical tones corresponding to No. 10.

A spring receiving wall 28 is integrally provided near the rear end of the inner surface of the key 10, and the rear end of the return spring 25 is locked by this spring receiving wall 28.
On the other hand, the front end of the return spring 25 is locked by a locking portion 29 provided on the top surface of the keyboard frame 1. The return spring 25 is a band-shaped flat spring formed by punching out a metal plate of an appropriate thickness, and is mounted between the key 10 and the keyboard frame 1 in a buckled state. Therefore, the return spring 2
5 is buckled and deformed in an arc shape as shown in the figure, and the reaction force of the spring 25 caused by this deformation imparts a clockwise rotational habit to the key 10 and biases it backward, and the engagement portion 14A, 14B to the locking portion 17
It is in pressure contact with the Note that 31 is a key guide that is integrally provided at the front end of the keyboard frame 1 to restrict and prevent the key 10 from turning in the left and right direction, and 32 is a key guide that is used to make the key 10 heavier so as to obtain a key touch feeling similar to that of a general piano. This is a weight disposed on the lower surface of the front end of the key 10 via a gasket 33.

According to the keyboard device having such a configuration, the key 10 is pivotally supported by the support shaft 12, so that stable and smooth key operations can be performed. Further, since the support shaft 12 is attached to each key 10 separately and independently and is held by the locking portion 17 of the support shaft holding member 13,
If the engaging parts 14A, 14B are pulled out from the locking part 17, the key 10 can be removed from the support shaft holding member 13 separately from other keys, thereby realizing a one-key, one-shaft system. Furthermore, the key 10 and the support shaft holding member 1
The work of attaching and detaching the support shaft 12 to and from the support shaft 12 is also extremely simple and easy. Note that since the key 10 is urged backward by the return spring 25 as described above, the support shaft 12 does not separate from the support shaft holding member 13 during normal playing, and therefore stable pressing is possible. Enables key operation. In addition, each support wall 15A, 15B, 15 of the support shaft holding member 13
C... has a function of restricting and preventing movement of the key 10 in the left and right direction.

FIG. 4 is an exploded perspective view of essential parts showing another embodiment of the invention. In this embodiment, engaging portions 14A and 14B are formed of long grooves in the diametrical direction on both end surfaces of the support shaft 12.
are provided, and each support wall 15A of the support shaft holding member 13,
The engaging portions 14A, 15B, 15C...
A locking portion 17 made of a protruding strip body is provided integrally with and protruding from 14B. In this case, the engaging portion 14A
and 14B is approximately equal to the rear end width _L of the key 10, and is slightly smaller than the distance _L1 between the pair of opposing locking portions 17 and 17. In addition, the total length of the support shaft 12
L ₂ is slightly smaller than the distance L ₃ between adjacent support walls 15A and 15B.

FIG. 5 is an exploded perspective view of a main part showing still another embodiment of the present invention. In this embodiment, the support shaft holding member 13 is formed by cutting and bending the keyboard frame 1 into a plurality of cut and bend pieces 50a, 50b, 50c.
. . . Engaging portions 14A and 14B made of protrusions are provided on both end surfaces of the support shaft 12,
Each of the cut and raised pieces 50a, 50b, 50c, . . . is provided with a locking portion 17 consisting of a long groove. in this case,
Since the support shaft holding member 13 is integrally constructed with the keyboard frame 1, the number of parts can be reduced and assembly workability can be further improved.

In addition, in this embodiment, the engaging portions 14A, 14
Although the case where B and the locking portion 17 are provided in the horizontal direction is shown, the present invention is not limited to this, and it goes without saying that they may be provided in the vertical direction.

〔Effect of the invention〕

As described above, the keyboard device for an electronic musical instrument according to the present invention has engaging portions protruding from both end surfaces of the support shaft that is inserted into the bearing hole of the key and rotatably supports the key.
This engaging portion is engaged with the locking portion of the support shaft holding member disposed on the keyboard frame, and the return spring gives the key a return habit and at the same time urges it backward. Since the engaging part is configured to come into pressure contact with the locking part, there is no fear that the support shaft will fall off from the support shaft holding member, and the key can operate smoothly and provide a good touch feeling. Furthermore, the work of attaching and removing the support shaft to and from the key and support shaft holding member is easy, the one-key, one-shaft system is realized, and the assembling workability is dramatically improved.

[Brief explanation of drawings]

Fig. 1 is a side view of a main part showing an example of a fulcrum structure in a conventional keyboard device, Fig. 2 is a sectional view showing an embodiment of a keyboard device according to the present invention, and Fig. 3 is an exploded perspective view of a main part of the same device. FIG. 4 is an exploded perspective view of a main part showing another embodiment of the invention, and FIG. 5 is an exploded perspective view of a main part showing still another embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Keyboard frame, 10... Key, 11... Bearing hole, 12... Support shaft, 13... Support shaft holding member, 14A, 14B... Engaging portion, 15A, 15
B, 15c...Supporting wall, 17...Locking part.

Claims (1)

[Scope of Claims] 1. A key having a bearing hole formed in the rear part thereof in the key width direction, and having a cylindrical or cylindrical shape with an axial length approximately the width of the key and having engaging portions on both end surfaces, a support shaft that is relatively rotatably inserted into a bearing hole of the key; a support shaft holding member having a locking portion that is engaged from the front with an engaging portion of the support shaft; and a support shaft holding member that imparts a returning habit to the key. What is claimed is: 1. A keyboard device for an electronic musical instrument, comprising: a return spring that presses the engaging portion against the locking portion by urging the key backward at the same time as the key is applied.